Ink-jet printer and method for restoring print head

FIELD: printing.

SUBSTANCE: invention relates to an ink-jet printer in which the operation of restoring is performed in the print head for ejecting ink, and to a method for restoring the print head in the ink-jet printer. The ink-jet printer comprises a print head that can eject ink. The device also comprises a transportation unit, which serves for transportation of a recording medium along the transportation path passing the printing position in which printing can be performed on the printing carrier by the print head. The cutter which can cut the printing carrier. The restoring unit to perform operations of restoring the print head. The control unit to control the restoring operation performed by the restoring unit based on the number of passes which is the number of times that the cut-off part of printing carrier, which is cut off by the cutter, passes the printing position.

EFFECT: proposed invention provides the systematisation of the process of restoring the print head taking into account cutting of the carrier.

14 cl, 13 dwg

 

BACKGROUND of INVENTION

The technical FIELD TO WHICH the INVENTION RELATES.

The present invention relates to inkjet the printer, in which the recovery operation is performed in the printhead to eject ink, and to a method for recovery of the printhead in an inkjet printing device.

DESCRIPTION of the PRIOR art

It is known that in the printing device is an inkjet-type ran the restore operation using cleaning agents, in order to restrain the deterioration of the printed image, at the same time maintaining a favorable ejection of the ink through the ejection hole in the printhead. As inkjet printing device running a restore operation using cleaning agents, there is a device in which under controlled conditions to measure the time to perform the cleaning on the basis of the measured time. The measured time includes, as disclosed in Japanese laid publication No. 2000-289229, for example, the total printing time during which printing is performed, while when the print head is not covered, elapsed time from a previous recovery operation, and time coverage, during which the coating is continuously performed after printing, for example. At the core is the training of these measured times refer to table to adjust the level of the recovery operation. By performing a restore operation, as described above, the printing device so designed as to contain an unnecessary restore operation to prevent the load on the user.

By performing a restore operation in time, as described above, it is possible to reduce the increased viscosity of the ink due to evaporation of water in the ink from the ejection holes of the printhead. However, when the inkjet printing device is in an environment in which dust such as paper dust easily attached to the ejection hole in the printhead, the inkjet printing device is not able to solve such a problem. Therefore, it may be sufficient to perform the recovery operation, as described above, in which the time is measured under controlled conditions in order to perform a recovery operation on the basis of the measured time.

The INVENTION

Due to the above situation, the present invention is the provision of an inkjet printing device, whereby, when the inkjet printing device is in an environment in which dust such as paper dust easily attached to the ejection hole in the printhead, the printhead is subjected to operations return the value depending on level attached dust and method of its recovery.

According to the aspect of the present invention, provided is an inkjet printing device, comprising: the print head, which can throw ink; block transport for transporting media along the transport route, passing the printing position where printing can be performed on the media of the printhead; a cutter that can cut the media; the recovery block to perform the recovery operation of the print head and a control unit for controlling the recovery operation performed by the recovery block based on the number of passes, which is the number of times that the cut section of media print, cut by the cutter passes the printing position.

According to the aspect of the present invention provides a method of restoring the printhead in an inkjet printing device that includes a printhead through which can inject the ink, and the recovery block to perform the recovery operation of the print head, comprising: a step of transporting the media along the transport route, passing the printing position where printing can be performed on the media of the printhead; a step of cutting media cutter; and a phase control operation vosstanovlenie is, performed by the recovery block based on the number of passes, which is the number of times that cut off part of media print, cut with the cutter passes the printing position.

According to the present invention, the print head may undergo surgery recovery time, depending on the ease of adhesion of dust (for example, paper dust) to the edge of the ejection holes in the printhead. Thus, the ejection printing may deteriorate due to the influence of dust attached (for example, paper dust). This can maintain the high quality of the printed image that is printed inkjet printing device.

Additional features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the accompanying drawings).

BRIEF DESCRIPTION of DRAWINGS

Figure 1 is a view in cross-section, schematically illustrating the internal configuration of an inkjet printing device according to the first variant implementation of the present invention;

Figure 2 is a view in cross-section, schematically illustrating the path of transportation of the sheet, which is used when single-sided printing inkjet printing device according to figure 1;

Figure 3 is a view in cross-section, schematically illustrating the way the TRANS is rtirovki sheet, used when printing inkjet printing device according to figure 1;

4 is a perspective view illustrating a cleaning mechanism, which performs the recovery operation of the print head of an inkjet printing device according to figure 1, in which the print head is in contact with the cover;

5 is a perspective view illustrating a cleaning mechanism, which performs the recovery operation of the print head of an inkjet printing device according to figure 1, in which the printhead is separated from the cover and the print head is not attached to the cover;

6 is a detailed image in perspective illustrating the block suction cleaner cleaning mechanism according to figure 4 and figure 5;

Fig.7 is a side view illustrating how the unit suction cleaner 6 is in contact with the printhead;

Fig block diagram illustrating the configuration of a control system of an inkjet printing device according to figure 1;

Fig.9 is a block diagram of a sequence of operations illustrating a sequence of operations to control the time at which executes the recovery operation of the print head when the inkjet printing device according to Fig 1 executes one-side printing;

Figure 10 - block diagram of the sequence of operations, illustriou the General sequence of operations management time which executes the recovery operation of the print head when the inkjet printing device according to the second variant of implementation of the present invention performs duplex printing when printing on the reverse side;

11 is a block diagram of a sequence of operations illustrating a sequence of operations to control the time at which the recovery operation of the print head is an inkjet printing device according to the third variant of implementation of the present invention;

Fig - table, which is used when the time at which the operation is performed to restore the print head is controlled on the basis of the sequence of operations according to 11, and which shows the relationship between the total number of the cutting and the number of passes the print position, as the threshold value; and

Fig - block diagram of the sequence of operations illustrating a sequence of operations to control the time at which the recovery operation of the print head is an inkjet printing device according to the fourth variant of implementation of the present invention.

DESCRIPTION of embodiments

In the next part describes the variant of implementation of the present invention with reference to the accompanying drawings.

PER THE FIRST OPTION EXERCISE

Inkjet printing device of this variant implementation, which uses a continuous sheet functioning as the media and wound into a roll, is illustrative high-speed line printer, and which can provide both simplex and duplex printing. For example, this inkjet printer is suitable for applications in which you want to perform a large number of printing, for example, in the printing factory. Figure 1 is a view in cross-section, schematically illustrating the internal configuration of the device 100 inkjet printing. Inkjet printing device 100 includes the following relevant boxes: part 1 submission sheet; part 2 extension; part 3 correction of the positional deviation; part 4 print; part 5 test part 6 of the cutter; part 7 print information; part 8 of the drying unit; 9 winding sheet; part 10 lead transportation; part 11 of the sorting outlet tray 12; and the control part 13. The sheet is transported by unit shipment, consisting of a pair of rollers and belt, along the path of transportation of the sheet (which will be described below), and subjected to the treatments of the respective blocks. In this embodiment, the sheet is the roll paper. Roll paper is provided by winding in the position of the roll is, and one of its edges is transported in the directions A1 and B1.

Part 1 sheet entry is the block that holds the roll paper from a continuous sheet wound in a roll, and which feeds one end of the sheet in part 4 print. Part 1 of feed of the sheet is made to fit the two paper rolls R1 and R2. Part 1 of the submission sheet made so as to selectively feeding the sheet one of two paper rolls R1 and R2 in the direction shown by arrow A1, to submit the sheet in which is located further in the printing position. The number of paper rolls, which may be placed in part 1 of feed of the sheet is not limited to two. Thus, it can also store one paper roll, or three or more paper rolls. Part 2 extension is a block to reduce torsion (warping) of the sheet fed from part 1 of the submission sheet. Part 2 extension is designed in such a way that the paths L1 and L2 pass sheets (which will be described later) had two clamping roller P1 and P2, and two clamping roller P2 and P3 corresponding to one of the leading roller r1, which are used to give the sheet a curvature opposite to the direction of twisting, bending of the sheet. Thus, the sheet is bent to adjust the bending of the sheet. By passing the sheet between the rollers for the correction of the IB of the sheet decreases. The sheet that has passed through part 2 of the extension, is transported in the direction shown by the arrow B1. Part 3 of correction of positional deviation is a unit that corrects the positional deviation of the sheet which has passed through the part 2 extension (tilt in the designated direction, along which must be followed by a sheet). Clamping one end of the sheet, which is used as a support, guide, positional deviation of the sheet is corrected.

Part 4 print is a unit which forms an image on the sheet by ink ejection from the print head 14 on the sheet transported in the direction shown by the arrow B1. Part 4 print also includes many conveying rollers 4a to transport the sheet. Part 4 print contains the print head 14 to eject ink through the ejection hole. Printhead 14 includes multiple ejection holes through which can inject the ink. Many holes emissions is an array of ejection holes. The array of ejection holes formed in the direction crossing the direction along which the transported sheet (the direction perpendicular to the conveying direction of the sheet in the case of this example). The print head 14 of this option is the printhead line of the CSO type, in which arrays of holes of the ejection of the jet type formed so as to cover the maximum width of the sheet that should be used. The print head 14 is designed so that multiple chips are arranged to be parallel to each other in the conveying direction of the sheet. In this example, the print head 14 includes seven print heads corresponding to cyan (C), Magenta (M), yellow (Y), light cyan (LC), light yellow (LM), gray (G) and black (K). The amount of color(s) and the number of printheads are not limited to family. Method of inkjet printing can be, for example, a method of using a element of the electrothermal transducer (heater), a method using a piezoelectric element, a method using an electrostatic element, or a method of using a element of the microelectromechanical systems (MEMS), for example. When using the heater, the heat generated by the heater, is used to emulsify the ink, so that the energy of their expansion could be used to eject ink through the ejection hole. The ink of the respective colors are served from the ink container through the ink tubes in the print head 14.

Part 5 is the unit that optically reads a test pattern or image is laid, printed on the sheet by part 4 of the print, to check the status holes ejection printhead, the state of transportation of the sheet or the position of the image, for example. Part 6 of the cutter (block cutter) is a block that includes the cutter 6a for cutting sheet so that the sheet as the media on which you are printing, could be cut to have a predetermined length. Cutter 6a is provided in the position 6c operations cutting along the path of transportation of the sheet. Part 6 of the cutter also includes many of the transporting rollers 6b for sending the sheet to the next stage. Part 7 print information block, which prints on the back side of the cut sheet print information (for example, serial number printing, date). Part 8 drying is a unit that heats the sheet on which was the seal part 4 of the printing and that was cut to dry the applied ink in a short time. In order to send the sheet to the next stage, part 8 of drying includes the shipping strap 8a, which is wound around the conveying roller 8b. In this embodiment, the part 6 of the cutter is provided on the side located further in the direction indicated by the arrow B1, the relative position 4b printing, in order to be able in order to cut the part of the roll paper, located on the side located further in the direction indicated by the arrow B1, the relative position 4b printing.

The winding device 9 sheets is a block that temporarily spools, before double-sided printing, the sheet that has already been subjected to printing on the top side. The winding device 9 sheets (part-turn) includes a winding drum 20, which rotates to wind the sheet. Two-sided printing is carried out by the method described below. Specifically, the image corresponding to the specified number of cut sheets, printed on the upper surface of the sheet (the printing on the top side). Then the part 6 of the cutter cuts off the rear end of the printing area of the image corresponding to the specified number of cut sheets. The sheet having the length specified number of cut sheets, is a continuous sheet that is not yet cut into individual cut sheets, which can also be referred to as a continuous sheet. This continuous sheet is transported along path L3 transport in the direction shown by the arrow C, and is temporarily wound around the winding drum 20. After the continuous sheet is wound around the winding drum 20, the winding drum 20 rotates in the opposite direction, and a continuous sheet transported along the path L2 t is unsportive in the direction shown by the arrow D. Then, the sheet is conveyed in part 2 extension goes in again and part 4 print. At this time the upper side of the continuous sheet is inverted. Thus, the reverse side of the sheet may be subjected to printing by means of part 4 of the print. A more specific function for two-sided printing will be described later. As described above, the inkjet printer 100 includes a winding device 9 sheets, which operates to reverse the upper surface and the reverse surface of the continuous sheet so that the reverse side could be subjected to printing.

Part 10 lead transportation is a unit, which transports subjected to printing cut sheet along the path L4 transport in the direction shown by the arrow E in part 11 of the sort. The sorting part 11 is a block, which sorts, as required, subjected to printing cut sheet in another discharge tray 12 on the basis of the group that displays the sheet and outputs the sheet. The control part 13 is a block that controls the respective parts of all of the printing device. The control part 13 includes a controller 15, which includes a Central processing unit (CPU), memory and various interfaces input/output (I/O)and power supply. Functioning is the printing device is controlled based on commands from an external machine 16 (for example, the host computer)that is connected to the controller 15, or which is connected to the controller 15 via the interface I/O.

Next, the following section will describe the operation of the inkjet printer during a printing operation. Inkjet printing device 100 of this variant implementation may implement one-sided printing to print only on one side of the roll paper, and duplex printing for printing on both of the upper surface and the reverse surface of the paper roll. As for simplex printing and duplex printing requires a variety of sheet travel path and the various operations of an inkjet printing device, the following section will be described the operation of printing simplex printing and duplex printing, respectively.

Figure 2 illustrates the operation of the inkjet printing device for single-sided printing. Figure 2 shows the path of transportation of the sheet along which the sheet is conveyed from part 1 of feed of the sheet is subjected to printing and displayed in the output tray 12. The sheet is fed from part 1 of feed of the sheet through the path L1 of transportation and subsequently subjected to a treatment part 2 extension and part 3 of correction of positional deviation, respectively. Then the sheet is transported in the direction shown by the arrow B1. Then the upper surface of the Lis is and is subjected to printing by means of part 4 of the print. Subjected to printing, the sheet is sent through the section 5 inspection under part 6 of the cutter, by which the sheet is cut into individual cut sheets having a given unit length. If required, the print information is printed on the back sides of the cut sheets by part 7 of the print information. Then subjected to printing cut sheets transported separately in part 8 of drying and dried. After that the cut sheets are sent through the part 10 lead, transportation and transported along the path L4 transport in the direction shown by the arrow E. Then cut the sheets are sequentially displayed and accumulate in the trays 12 part 11 sorting.

Figure 3 illustrates the operation of the duplex printing. Figure 3 shows the path of transportation of the sheet for duplex printing. The sheet fed from part 1 of feed of the sheet is subjected to continuous printing on the upper surface of the sheet with the image corresponding to the specified number of cut sheets. After the image corresponding to the specified number of cut sheets continuously printed on the upper surface of the sheet, part 6 of the cutter cuts the rear end of the printing area of the image corresponding to the specified number of cut sheets. Specifically, at the point in time at which printing on the top surface is rnost completed, part 6 of the cutter is not cutting the sheet into individual cut sheets, but instead cuts the sheet to the continuous sheet having a length corresponding to a given number of cut sheets. Continuous sheet once transported along path L3 transport and then is wound around the winding drum 20.

The front end of the continuous sheet is wound around the winding drum 20. Then the rear end of the sheet is returned along the path L2 transportation in part 2 of the extension. In the continuous sheet on the upper surface of which were printed image, flips, to have inverted the top and back side. Then the inverted sheet is subjected to a treatment part 2 extension and part 3 of correction of positional deviation. Then the sheet is subjected to printing on the reverse side by side 4 print. Thus, the continuous sheet is first subjected to a sequence of printing on the upper side, and then print sequence on the reverse side. During printing on the reverse side, to re-embrace continuous sheet, the upper side of which is already subjected to printing, no sheet should not be located along the path of transport of the sheet from part 2 of the extension to part 6 of the cutter. Thus, the sheet is cut from a continuous sheet and left in part 5 audits by the, part 4 of the seals, part 3, correction of positional deviation and part 4 of the extension, re-wound on part 1 of feed of the sheet through the path L1 transport along the direction of the arrow B2, and the direction of the arrow A2 (operation return home).

As described above, the inkjet printer 100 of this option may not provide the operation of the feeder, in which the sheet is conveyed by the unit transportation of part 1 of the feed of the sheet through the position 4b printing position 6c cutting operations. Inkjet printing device 100 of this variant implementation may also provide the operation returns, in which a portion of the sheet located between the position 6c operations of cutting and part 1 of the submission sheet, returns in part 1 of the submission sheet.

A continuous sheet in which the operation was performed in the drying of ink on the upper surface of the sheet by part 8 of drying is not on the path L4 transportation part 10 lead, transportation, and L3 transport device 9 winding sheets. The front end of the continuous sheet is fed to the winding device 9 sheets along the path L3 transportation around the winding drum 20 rotating in the forward direction (counterclockwise direction in the drawing). Then the whole continuous sheet, including the rear end, nativesaver.h device 9 winding sheets.

After this winding drum 20 of the winding device 9 sheets rotates in the reverse direction relative to the direction along which the continuous sheet was wound (the clockwise direction in the drawing). The rear end of the wound continuous sheet (which is a forward end when the sheet is loaded) is sent along the path L2 transportation in part 2 of the extension. Part 2 extension exposes the sheet correction curve in the opposite direction relative to the direction when printing on the top side. The reason is that the continuous sheet is wound around the winding drum 20, when the upper side and the reverse side is reversed in comparison with the roll out in part 1 of feed of the sheet, and thus curved in the opposite direction. After that, the continuous sheet is sent through part 3 of correction of positional deviation in the part 4 of the print, where the reverse side of the continuous sheet is subjected to printing. Then the sheet is subjected to printing the reverse side is transported through the section 5 inspection under part 6 of the cutter. Then, the continuous sheet is cut part 6 of the cutter on separate sheets having the size as the final subjected to a printing sheet having a given unit length. Since both sides of the cut sheet already subjected to printing, the printing part 7 of the printing is not performed. Setmodelname cut sheets are transported one by one in part 8 of drying and sequentially discharged through the portion 10 of the lead transport in the tray 12 in part 11 of the sort and accumulate in the tray 12.

In this embodiment, the part 6 of the cutter is provided on the following side in the direction shown by the arrow B1, relative to the print position, in which the media is subjected to printing by the printhead. As described above, part 1 of feed of the sheet re-spools any portion of the sheet remaining in part 5 validation, part 4 print, part 3 of correction of positional deviation and part 2 extension, the result of the operation of cutting the continuous sheet when performing duplex printing. In a similar manner, the sheet after completion of the sequence of operations of the single-sided printing, cutting and left in part 5 validation, part 4 print, part 3 of correction of positional deviation and part 2 extension can re-gather around the part 1 of the submission sheet. Operation re-winding, as described above, is performed by returning the cut part on the front end of the roll paper, cut a part of the cutter, through the position 4b of the seal in the direction shown by the arrow B2 in the roll position. As described above, the cut portion in the front end of the paper roll is returned to the position S1 of the roll. Thus, the subsequent one-side printing and duplex printing can be performed by effectively using the area close to the front end of the heat-seal the second paper, for the print operation. This can prevent a situation where a portion close to the front end of the paper roll is not used for printing and, thus, is consumed inefficiently, thus increasing the portion of the roll paper, which can be used for printing. Thus, the roll paper can be used more efficiently, and therefore, the consumption of paper roll can be reduced, thus minimizing the costs of operating an inkjet printing device. Moreover, the above configuration can reduce the portion of the roll paper, which appears uneconomical, thus providing the environment-friendly inkjet printing device. If the front end of the paper roll is not wound again in the position of the roll, the portion of the front side edge of the roll paper that is closer to the front edge in the direction shown by the arrow B1 than the position 4b, will be transported further in to the side without exposure to print in the print position 4b. Thus, part of the front side edge of the roll paper out of the printer without using for the print operation, thus, proportionally causing wasteful consumption of paper roll.

In this embodiment, tresan the part on the front end of the paper roll, cut part 6 of the cutter is returned through the position 4b printing position S1 of the roll. However, the present invention is not limited to this. Specifically, the cut-out portion at the front end of the paper roll, cut part 6 of the cutter does not have to return to the position S1 of the roll, since the cut portion is transported to a position closer to the direction of the arrow B2 (previously located along the side)than the position 4b printing, in which ink are ejected through the print head. Alternatively, the sheet is cut part 6 of the cutter and left in part 5 validation, part 4 print, part 3 of correction of positional deviation and part 2 extension may return to the position between the position S1 of the roll and position 4b printing.

4 and 5 is a perspective view illustrating the detailed configuration of the mechanism 21 cleaning. Figure 4 illustrates the state (during a restore operation), in which the mechanism 21 cleaning contains the printhead 14. Figure 5 illustrates the state in which the print head is not placed in the mechanism 21 cleaning. The mechanism 21 cleaning includes a cover 51 and a positioning element 71. When the print head 14 is subjected to a recovery operation, the print head 14 is moved to the position corresponding to the mechanism 21 clear and, and subjected to a recovery operation to maintain a favorable state of ejection of ink from the orifice of the ejection printhead 14.

The mechanism 21 cleaning includes: unit 46 of the suction cleaner (unit of recovery, the suction unit to remove substances attached to the surface of the hole ejection printhead 14; a transfer mechanism for moving the block 46 of the suction cleaner along the direction of the treatment; and the frame 47 to support these elements in the United state. The block 46 of the suction cleaner is a movable unit that contains two suction holes, which will be described later. The block 46 of the suction cleaner performs a recovery operation by cleaning the dust, at the same time sucking the dust when the dust (for example, paper dust) is the formation of hole emission, in which is formed a hole emission in the printhead. The transfer mechanism is driven by a source of drive to move the block 46 of the suction cleaner, directed and supported by two shaft 45 in the direction, along which passes the array of the ejection holes. The source drive comprises a drive motor 41 and gear 42 and 43 and rotates the drive shaft 37. Rotation of the drive shaft 37 is transmitted by a belt 44 and pulley, so about the time to move the block 46 of the suction cleaner. The block 46 of the suction cleaner operates, as will be described below, to suck the substance attached to the surface of the ejection holes of the print head 14 through the suction hole, and at the same time cleans the print head 14, so as to delete the attached substance.

Figure 5 cover 51 is supported by the holder 52 of the cover. The holder 52 of the lid is displaced by the spring in the direction vertical to the surface of the ejection holes of the print head 14, and can be moved against the spring. While the frame 47 is in the covered position, the print head is moved in the direction vertical to the surface of the ejection holes, to enter into contact and separated from the cover 51. By covering the surface of the ejection holes by allowing the cover 51 to contact with the surface of the print head, the ejection hole is protected from drying out.

Positioning element 71 operates, during a restore operation and coverage to be in contact with the positioning element from the print head, provided in the holder head, so as to determine the positional relationship between the print head 14 and the mechanism 21 cleaning. 6 is a perspective view illustrating the configuration of the block 46 of the suction cleaner. The block 46 in anywayse purifier includes two suction holes 22, in order to match two arrays of ejection holes.

Two suction holes 22 is configured in a plane that includes suction holes 22, and in the direction perpendicular to the scanning unit 46 of the suction cleaner to have substantially the same interval as the interval between the two arrays of ejection holes in the printhead 14. Two suction holes 22 are also made so as in the direction of the scanning unit 46 of the suction cleaner to have substantially the same interval as the interval (specified distance) between two adjacent chips in the printhead 14. The suction hole 22 is supported by the holder 23 to the suction holes. The holder 23 of the suction holes is shifted by the spring 25, as the elastic body, in the direction vertical to the surface of the hole ejection printhead 14. Specifically, the suction portion 26, which includes a suction hole 22 may be moved against the spring to move in the direction perpendicular to the surface of the ejection holes. In other words, the holder 23 of the suction holes is supported by the transfer mechanism, which can move in the direction of spacing of the surface of the ejection holes and the media. This mechanism lane is a mix of works, to absorb the movement of the suction portion 26, when the suction portion 26 is moved over a closed chip part of the printhead 14. Two suction holes 22 is connected to the tube 24 by means of the holder 23 to the suction holes. Tube 24 is connected to the block of formation of negative pressure such as a vacuum pump. When the block of formation of negative pressure is driven, a negative pressure for suction of ink or dust is fed into the inner part of the suction holes 22.

Fig.7 is a side view illustrating a recovery operation by the cleaning mechanism. Fig.7 is a side view illustrating the print head 14 is subjected to a recovery operation by suction holes 22. When the restore operation, the print head 14 is installed in such a location that allows the upper edge of the suction portion 26 to be in contact with the surface of the hole ejection printhead 14. The block 46 of the suction cleaner also functions as a cleaning unit to clean the surface of the forming hole ejection printhead, comprising the ejection hole. When the number of passes, when the cut portion of the sheet passes the position 4b printing, equals or exceeds the threshold value, the block 46 of the suction cleaner of iseet surface forming the hole emission. When a restore operation is running, the block 46 of the suction cleaner is moved along the direction along which passes the array of ejection holes, at the same time allowing you to block the formation of negative pressure to form a negative pressure in the suction hole 22. As a result, during use of negative pressure to suck the ink or dust attached to the edge of the hole emission, through the suction hole 22, the ink or dust can be removed from the printhead 14. As described above, the restore operation is performed by the block 46 of the suction cleaner in which is formed a suction hole 22, which can suck the attached substance by means of negative pressure, and the suction hole 22 can be scanned in the direction, along which passes the array of ejection holes in the printhead 14. The block 46 of the suction cleaner also functions as a suction unit that sucks the substance attached to the surface of the forming hole ejection printhead, comprising the ejection hole. When the block 46 of the suction cleaner is in contact with the tab closed part relative to the surface openings of the ejection printhead 14 in the middle of the movement in the direction along which passes the array resp is RSTI release, the suction portion 26 is pushed in the direction perpendicular to the surface of the ejection holes. As described above, in block 46 of the suction cleaner holder 23 of the suction holes can move in the direction perpendicular to the surface of the ejection holes. Thus, even when the suction portion 26 is pushed, its movement can be facilitated by moving the holder 23 to the suction holes.

The recovery operation for removing dust (for example, paper dust)attached to the printhead, is performed in this embodiment, by the operation of the suction through the suction hole 22 and by bringing into contact block 46 of the suction cleaner and the print head 14 to be cleaned by block 46 of the suction cleaner. However, the present invention is not limited to this. The restore operation other than the above can also be performed. For example, instead of performing the operations of suction and scavenging operation in the recovery operation can be performed only one operation of suction and cleaning operations. It is also possible, in which the bending of the sheet causes the contact sheet and the print head, and thus, paper dust from the sheet, for example, is attached to the printhead 14. To remove dust(for example, paper dust)attached to the print head 14 due to a bent sheet as described above can also run the recovery operation such as preliminary ejection. When the preliminary ejection is ejection through the opening in the ejection of droplets of ink that does not affect the printing operation, during a restore operation. As a result, dust (for example, paper dust remaining in the ejection hole, is removed from the ejection holes. The preliminary ejection may be performed by ejection of ink from the orifice of the ejection printhead 14 in the cover. Alternatively, the preliminary ejection may be performed by ejection of ink in position without sheet (e.g., plate, conveyor belt). Alternatively, the restore operation can also be performed through the suction recovery using the block suction recovery to suck and remove the ink through the ejection hole by force, at a time when the hole ejection printhead 14 is covered with a lid. Alternatively, the restore operation can also be performed by recovery with increasing pressure to use the recovery block with increasing pressure to increase the pressure on the ink in the PE atousa head, so as to bring the ink through the ejection hole. You can also perform other recovery operations.

Fig illustrates a block diagram illustrating a control system used for the above-described inkjet printing device. The buffer 61 of the reception inkjet printing device 100 receives from the host computer 60 data for characteristics or images that should be printed. The main computer 60 receives from the inkjet printing device 100, the data to ensure that data is transferred correctly, or the data showing the state of operation of an inkjet printing device 100, and outputs them. Data buffer 61 receiving transmitted in part 63 of the memory under the control part 62 of the control (CPU (CPU)) and temporarily stored in random access memory device (RAM, RAM).

Upon receiving commands from the CPU 62, the actuator 64 of the motor carriage actuates the motor 65 of the carriage to control the linear carriage 72 of the head. On the basis of commands from the CPU 62 of the mechanism (mechanical parts) (for example, the cover 51, the block 46 of the suction cleaner) are driven and their functioning is controlled. On the basis of commands from the CPU 62, the actuator 66 of the conveyor motor drives the transport motor 67 and manipulated the conveying roller 73 for transporting print media. On the basis of commands from the CPU 62, the drive motor 68 of the cutter actuates the motor 69 of the cutter and controls the cutter 74 for cutting media that he had given length. On the basis of commands from the CPU 62, the drive motor 70 ink circulation controls the motor 71 of the ink circulation for actuation of the circulation pump or two-position valve. On the basis of commands from the CPU 62, the print head 14 is driven in a controlled manner, so as to print images and pre-release.

Next, the following section will describe the time at which executes the recovery operation of the printhead in an inkjet printing device of this variant implementation. Inkjet printing device 100 of this variant implementation unit has re-winding for re-winding, after completion of the print operation, the front end of the paper roll (the end of the party located earlier in the course) of part 6 of the cutter in the position S1 of the roll. Through this unit, re-winding, whenever inkjet printing device 100 executes the printing stage from enabling the printing device to turn off the power source of the printing device, the operation is repeated winding to repeat the RNO to wrap the severed part of the paper roll in position S1 of the roll after the print operation. Operation re-winding allows the cut side on the front end of the roll paper held the position 4b printing, in which printing is performed by ejection of ink from the printhead. The end of the cut side of the roll paper may contain dust (for example, paper dust)attached to it, with a higher probability than the other parts. Thus, there is a risk that in the situation when the cut portion is position 4b of the seal, dust (for example, paper dust)attached to the cut side, can be moved and attached to the printhead 14. When the dust (for example, paper dust) attached to the edge of the ejection holes in the printhead 14, the dust is undesirable litters hole emission, thereby causing a risk situation that may not be supported by favorable ejection of ink. Even when the dust does not contaminate the ejection hole, there is another risk that the dust, located in part of the hole emission affects the direction of flight of the ink drops, thereby causing deterioration in accuracy landing ejected ink. To prevent this, an inkjet printing device 100 of this variant implementation performs the recovery operation depending on the number of passes, when the cut portion of the roll paper has passed the printing position due to the surgery the re-winding.

In the next section will describe the recovery operation of the print head in this embodiment. The recovery operation of the print head is performed at a specified time, when one-side printing. Fig.9 is a block diagram of the sequence of operations used when controlled by the time to perform the recovery operation of the print head 14.

First, the printing operation starts after receiving the print command from the operator. When starting the printing operation, the drive motor 64 of the carriage actuates a linear carriage head on the step S11, to move the print head 14. At the same time part of the mechanism (mechanical part) (e.g., cover and cleaner) also moves. During the print head 14 is moved from the covered position in which the surface of the forming hole ejection printhead is covered by a cover, in the printing position, in which the ink is ejected for printing.

When the print head 14 is moved to the printing position, starts the print image on the print media through the print head 14 at step S12. During this actuator 66 of the conveyor motor controls the conveying roller 73 for transporting the sheet to continuously conveying the sheet. At the same time, whom the NDA from the CPU 62 controls the actuation of the printhead 14.

Then, the print head 14 performs the preliminary ejection between images by ejection of droplets of ink, which does not affect the seal through the opening in the ejection position between the printed images, printed on a continuously conveyed sheet. Pre-release between images is performed to output ink having increased viscosity, on the edge of the ejection holes in the printhead. The preliminary ejection, as described above, it is desirable to perform in every fixed cycle, in order to prevent the accumulation of ink having increased viscosity, on the ejection hole in the printhead. Pre-release between images is performed in a period from completion of printing of the specified print area before printing the next print. However, when printing a relatively large image, a situation may arise in which the print image requires a lot of time, which causes a long interval between the preliminary emissions between images. Thus, the interval between the preliminary emissions between images is undesirable to exceed a fixed time, thereby causing the possibility of accumulation of ink having increased viscosity, on the edge of the ejection holes in the printhead. To prevent this, when PR is maritally release, performed between images, between the printing of the printed image in the specified area, may not provide sufficient frequency pre-release, pre-release between images can also be combined with the preliminary finding of the paper to the exposure of the printed image processing recovery ejection. When pre-emission is not required, as a preliminary discharge between the image and the preliminary conclusion of the paper can also be skipped.

When the image is printed on the roll paper, a test pattern and the image printed on the sheet, optically read. After that, the drive motor 68 of the cutter at step S13 actuates the motor 69 of the cutter on the basis of a command from the CPU 62. As a result, the blade of the cutter is moved to cut subjected to a printing roll paper so that it has the specified length (phase cutting). Cut sheets are transported directly and are subject to the stage of drying. Then the sheets are sequentially transported in trays part of the sort. The actuator 66 of the conveyor motor at step S14 controls the transport motor 67 for transporting cut sheets. Then the continuous transportation of the cut sheets is completed, thereby completing the printing is th image.

After the sequence of stages of image printing paper roll, continued from the position of the roll to position the cutting, after cutting, re-wound on the original part 1 sheet feeder at step S15 (operation re-winding). Then, at step S16, the number of operations re-winding is calculated to determine whether you should or should not expose the print head recovery operation. As described above, in this embodiment, the number of operations re-winding is calculated as the number indicating the approximate number of times that the cut portion on the front end of the roll paper passes the printing position. When the number of times that the cut-out portion in the front edge of the media passes the printing position during the operation of re-winding equals or exceeds the specified threshold value, the printing device is controlled so that the print head has undergone a recovery operation at step S17. In this embodiment, the threshold value for the number of operations is repeated namachivanii is 10. When the restore operation to remove paper dust attached to the orifice of the ejection printhead, used suction cleaner to clean the part, including the CTE is the participation of emission, while the absorption of this part.

As described above, when the number of operations re-winding equals or exceeds the specified threshold value, the print head 14 is subjected to recovery operations (recovery phase). In this embodiment, instead of the number of passes, which cut the part in the front edge of the roll paper, cut part 6 of the cutter passes the printing position is used a number of times in which the operation is performed re-winding. During this CPU 62 operates as a control unit to control unit 46 of the suction cleaner, so that the print head 14 was subjected to the recovery operation. The number of times that executes the recovery operation is reset to zero whenever the number of times equals or exceeds the threshold value. Specifically, the value of the number of passes is reset to zero whenever the value of the number equals or exceeds the threshold value.

In this embodiment, when the number of times when running the restore operation, equals or exceeds the threshold value, performs the restore operation. During the operation of re-winding the front end of the sheet in the direction of B1 is returned in part 1 of feed of the sheet passes the position 4b printing, as well as the passes 4b printing, when the sheet is sequentially fed in the direction B1 again to print. Thus, the operation of re-winding actually means that the cut portion of the sheet passes the position 4b printing twice. Thus, it can be used a configuration in which, whenever the recovery operation is performed once, two counts of the number of passes, and the actual number of passes for position 4b unit, the leading edge of the sheet in the direction B1 passes 4b printing, is compared with a threshold value. As described above, the number of times that the cut portion of the sheet actually passes 4b printing, can be computed, and the restore operation can be performed on the basis of the counted number. As described above, the number of passes, showing the number of times that the cut portion of the sheet passes the position 4b printing, can be also calculated in order to include the number of times that the cut portion of the sheet passes the position 4b printing, when the sheet is conveyed in the direction B1.

During the operation of re-winding the front end of the cut sheet remaining in the direction B1 in part 5 validation, part 4 print, part 3 of correction of positional deviation and part 2 extension, passes 4b printing under conditions in which a small time prospect who was from the time of the operation of the cut sheet. Thus, there is a possibility that a relatively large amount of paper dust attached to the printhead 14. Thus, the sheet passing position 4b printing immediately after surgery, re-winding, can be a problem. Thus, if the passage of the sheet position 4b printing immediately after the surgery re-winding is a problem, in particular, can be considered only the number of operations re-winding, and the restore operation can be performed on the basis of the calculated values.

At step S18, the drive motor 64 of the carriage actuates part 65 mechanism (mechanical part) (for example, linear head carriage, the cover and cleaner)to move the print head 14 after the print operation or recovery from the print position to the covered position. Then the sequence of printing operations is completed.

As described above, in this embodiment, attention is drawn to the number of times that the cut portion on the front end of the roll paper passes the printing position. Time restore operation is controlled so that it occurs only when the above number is equal to or exceeds the threshold value. This subsequently can restrain the situation when the paper dust attached to the edge of the hole emission in ichatusa head 14, litters hole emission. This subsequently can restrain the situation, when the dust (for example, paper dust)attached to the edge of the hole emission, causes deterioration in the quality of the printed image, thereby maintaining the high quality of the printed image. Since the deterioration of the printed image due to dust (for example, paper dust)attached to the print head 14, may be kept, can be kept the situation in which the subsequent optical detection of the printed image shows that the quality of the printed image does not reach the fixed level. This can prevent a situation in which the quality of the printed image is determined as not reached a fixed level, which leads to the destruction of the media. Thus, the amount of destruction of such sheets can be reduced, thus reducing the amount of paper dust.

The SECOND OPTION EXERCISE

Next, the following section will describe the second variant implementation of the present invention. It should be noted that the portions that coincide with parts of the first variant of implementation, are denoted by the same reference numbers, and will be described only different parts. The second variant of implementation differs from the first variant of realization of the fact that jets the second printing device 100 performs duplex printing. In the next section will describe the time of the recovery operation of the print head, which is performed in the inkjet printing device 100 that performs duplex printing.

Figure 10 - block diagram of the sequence of operations showing the time at which the print head 14 is subjected to a recovery operation when the reverse side is subjected to printing for two-sided printing. Time to print on the upper side is the same as time in the first embodiment, and therefore will not be described further. Thus, the block diagram of the sequence of operations figure 10 starts from the time after completion of printing on the upper side and at the time of starting printing on the reverse side.

When duplex printing is first subjected to printing the top surface. The recovery operation of the print head 14 when printing on the top surface has already been described in the first embodiment. However, printing on the reverse side of impossible, if roll paper out of the rolls R1 and R2 provided in the roll position. Thus, when printing on the upper surface, roll paper is cut after the printing areas of the printing image on the upper surface corresponding to a given number of cut sheets. After that, the continuous sheet one RA is transported along path L3 transport in the direction C in preparation for printing on the reverse side and is wound by the winding device 9 sheets. Then the upper side and the reverse side of the continuous sheet, as well as the front end and the rear end of the change to flip a continuous sheet. Then inverted continuous sheet is transported to the position 4b printing, located opposite the print head 14.

After that, at step S21 starts printing on the reverse side. Then the drive motor 64 of the carriage actuates a linear carriage of the head, and the CPU 62 operates part of the mechanism (mechanical part) (for example, the cover and cleaner)to move the print head 14 from the covered position to the print position. To start printing on the reverse side on the step S22, the continuous sheet after printing on the upper side is served in the position directly in front of the printhead. At step S23, on the basis of commands from the CPU 62, the print head 14 is controlled and driven so as to print the image. The continuous sheet is subjected to printing on the upper side, and the front end of the continuous sheet is cut at the final stage of printing on the top side. Thus, the front end of the continuous sheet in the front side in the conveying direction is also cut off part of the media. Thus, the number of feeds paper when printing on the reverse side is calculated as the number of times that the sheet passes the printing position. A continuous sheet, inverted, to perform printing on the reverse side, must be submitted in position 4b printing. Thus, the sheet remaining in the side position 4b printing, re-wound on the part 1 paper feed after the operation of cutting the sheet. During this cut portion of the sheet also passes 4b printing.

When the image is printed on the reverse side, the test pattern and the image printed on the sheet, optically read. Then subjected to printing a continuous sheet is cut into individual cut sheets at step S24. As described above, when printing on the reverse side, the continuous sheet is cut in the areas that match a given number of cut sheets, so as to provide individual cut sheets.

When a continuous sheet is again fed into the position 4b printing during the subsequent winding sheet and print on the back, paper dust caused by the cutting process, can be attached to the cut side of the sheet.

Cut sheets are not transported in the device 9 winding sheets and dried. Then the sheets are sequentially transported along the path E transportation trays part of the sort. At step S25, the actuator 66 of the conveyor motor controls tranportirovochnye the motor 67 for transporting sheets, to complete the transportation of the sheets. Then, the printer completes the printing of the image.

When printing fixed print image is completed, and the stage of printing is completed, the continuous sheet is cut at step S26. Then any portion of the sheet remaining in part 5 validation, part 4 print, part 3 of correction of positional deviation and part 2 extension, re-wound on part 1 of the submission sheet. During this operation, re-winding the end of the sheet past the printing position directly under the print head 14 can cause the movement of the paper dust attached to the sheet, thus causing the attachment of paper dust to the edge of the hole ejection printhead. Thus, the sum of the number of times the operation is repeated winding and the number of times of supply of the reverse side of the paper is calculated at step S27.

As described above, in this embodiment, instead of the number of times that the cut portion of the sheet passes the position 4b printing, use the sum of the number of operations is repeated winding and the number of filings reverse side of the paper. By comparing the sum of the number of operations of re-winding and the number of filings reverse side of the paper with the specified threshold value is determined whether it is necessary to expose the print head recovery operation. Specifically, the number of transits also who engages in itself a number of times, when the cut portion of the sheet passes the position 4b printing, when the sheet is fed by a winding device 9 sheets in position 4b printing. Thus, the inkjet printer 100 is controlled so that the restore operation was performed depending on the number of times that the cut portion of the roll paper has passed the printing position. When the sum of the number of operations is repeated winding and the number of filings reverse side of the paper is equal to or exceeds the threshold value, the print head is subjected to a recovery operation in step S28. In this embodiment, the threshold value of the sum of the number of times the operation is repeated winding and the number of times of supply of the reverse side of the paper set at 10. When the restore operation paper dust attached to the edge of the hole ejection printhead 14 is removed by cleaning this region, at the same time allowing the block 46 of the suction cleaner to perform absorption of this region. Then, in step S29, the drive motor 64 of the carriage actuates a linear carriage of the head, to move the print head 14 after printing or restore operation from the print position to the covered position, thereby completing the sequence of printing operations.

As described above, when printing is performed using two-sided printing, the number p is kodani includes the sum of the number of operations is repeated winding and the number of filings paper winding device 9 sheets to replace the upper surface and the reverse surface of the paper roll in order to perform printing on the reverse side. Thus, two-sided printing is controlled so that the sum of the number of times of operations of re-winding and the number of filings of paper for printing on the reverse side was compared with the threshold value, so that the restore operation was performed when the sum of the number of times that equals or exceeds the threshold value.

When the last sheet is subjected to printing with duplex printing as the front end side and rear end side of the sheet in the conveying direction is cut off part. In this case, the cut portion of the sheet passes the print position twice during paper feed for printing on the reverse side. Thus, a situation may arise when only the sum of the number of repeated namachivanii and feed paper for printing on the reverse side is different from the target number of times the cut portion of the sheet actually passed the printing position. Thus, if the sum of the number of repeated namachivanii and feed paper for printing on the reverse side is different from the number of times the cut portion of the sheet actually passed the printing position, it is preferable to give priority to the number of times the cut portion of the sheet actually passed the printing position. Thus, can be used confit who orazia, in which, when the last sheet is subjected to printing on the reverse side, is many times greater than the actual number of paper feed for printing on the reverse side. If the sum of the number of repeated namachivanii and feed paper for printing on the reverse side is different from the number of times the cut portion of the sheet actually passed the printing position due to other reasons, the number of paper feed for printing on the reverse side can also be adjusted. Importantly, the number of times that the cut portion of the sheet passes the position 4b printing is correct.

A THIRD OPTION EXERCISE

Next, the following section will describe the third variant of implementation of the present invention. It should be noted that the portions that coincide with parts of the first variant of implementation, and the second variant implementation, are denoted by the same reference numbers, and will be described only different parts.

A third option implementation differs from the first and second embodiments in that, when determined by the time at which a restore operation is running, the threshold number of passes, which cut off part of the sheet passes the printing position changes depending on the accumulated number of cutting times is cutting Listev following section describes the time in which the print head is subjected to a recovery operation in this embodiment. 11 is a block diagram of a sequence of operations that is used to determine the time at which the print head is subjected to a recovery operation in the third embodiment. First, the printing operation starts after receiving the print command from the operator. Then the drive motor 64 of the carriage actuates a linear carriage head on the step S31. Part of the mechanism (mechanical part) (e.g., cover and cleaner) is actuated to move the print head 14 from the covered position to the print position. At step S32, the actuator 66 of the conveyor motor controls the conveying roller 73 to transport the continuous sheet. Command from the CPU 62 controls and actuates the print head 14, to start a print image. After the image is printed on the media, print test image and the printed image is optically read. Then the drive motor 68 of the cutter at step S33 actuates the motor 69 of the cutter on the basis of a command from the CPU 62. As a result, the cutter moves to cut subjected to a printing sheet so that it has the specified length. During this paper dust generated during the cut the Oia, for example, can be attached to the cutting part of the cutter. Thus, during cutting of the sheet by the cutter, there is a possibility of a situation in which paper dust attached to the cutting part of the cutter, accumulates and moves with the cutting part of the cutter on the sheet. At step S34, the actuator 66 of the conveyor motor controls the transport motor 67 for transporting sheet and completes the transportation of the sheet, thereby completing the printing process of the image.

After completion of the printing process of the image operation is performed re-winding, in which the end of the sheet roll paper, which is not yet subjected to printing after the stage of cutting, returns to the position of the roll paper roll at the step S35. During this operation, re-winding the sheet passes the printing position, in which inks are ejected from the printhead. Thus, a situation may arise in which the paper dust attached to the sheet, is moved to the print position and attached to the edge of the hole ejection printhead. Paper dust attached to the edge of the hole emission, can influence the process of ejection of the ink, thus causing poor print quality.

The amount of paper dust attached to the printhead from the operation of the winding, can different the sterile depending on the accumulated number of the cutting, showing how many times the cut operation was performed after using inkjet printing device. Generally, with the increase in the number of times the cutter cuts the roll paper, the blade of the cutter becomes dull. Thus, cutter, used for cutting large quantities of rolled papers, a dull blade than the cutter at the beginning of the use of inkjet printing device, which causes the probability of the increased amount of paper dust caused by the cutting of the sheet. Specifically, an increased amount of paper dust attached to such cutter, causes an increased amount of paper dust, which causes an increased amount of paper dust attached to the roll paper, thus causing the possibility of a situation in which an increased amount of paper dust is attached to the printhead when the end of the roll paper passes the printing position.

There is a possibility of another situation in which the dust (for example, paper dust)attached to the printhead, is not completely removed when the printhead is subjected to a recovery operation. Thus, as time passes after the start of use of the inkjet printing device, dust (for example, paper dust, which could not be removed using predydushimi restore the print head, can accumulate, leading to an increased amount of dust (for example, paper dust)attached to the printhead.

For the above reason, even when the number of times the end of the roll paper passes the printing position is the same, the amount of dust (for example, paper dust)attached to the printhead, may differ depending on the accumulated number of cutting times roll paper is cut after the start of use of the inkjet printing device. To take this into account, can be considered an approach in which the frequency of the recovery operation varies depending on the accumulated number of cutting times the cut operation was performed after the start of use of the inkjet printing device. Generally, with the increase in the accumulated number of cutting times roll paper into fragments were after you start using inkjet printing device, more dust (for example, paper dust) attached to the printhead 14. Thus, in this embodiment, with the increase in the accumulated number of cutting times roll paper into fragments were after you start using inkjet printing device, the threshold value for the number of passes decreases compared the structure with the case, when the accumulated number of the cutting little. Specifically, the threshold value for the number of passes decreases with the increase of the accumulated number of playthroughs. Thus, the frequency of the recovery operation increases with the accumulated number of cutting times roll paper is cut into the printhead 14.

At step S36 of the flowchart of the sequence of operations 11 is the accumulated number of cutting times roll paper is cut, and the number of times the cut portion of the roll paper passes the printing position. Then the number of times indicating how many times the end of the roll paper passes the printing position is compared with the specified threshold value from the table. Whenever the number of times indicating how many times the end of the roll paper passes the print position exceeds the threshold value, the print head is subjected to a recovery operation at the step S37. In this embodiment, the printhead is subjected to a recovery operation on the basis of the tables shown in Fig. In the table on Fig the left column shows the accumulated number of times the cut operation is performed after the start of use of the cutter in an inkjet printing device. In the table on Fig right column on which it shows a threshold value, which is determined on the basis of the accumulated number of times the operation is performed cutting, and which shows the value indicating the number of times the end of the roll paper passes the printing position. A value indicating the number of times the end of the roll paper passes the printing position is reset to zero whenever a restore operation is running. On the other hand, the value of the accumulated number of times the cut operation is performed after the start of use of the inkjet printing device is not reset after the restore operation. Specifically, as shown in Fig. 12, when the accumulated number of times the cut operation is performed after the start of use of the inkjet printing device is within a range from 0 to 10000, the print head is subjected to a recovery operation, whenever the number of times the end of the roll paper passes the printing position reaches 100. Then, when the accumulated number of times the operation is performed cutting, increases to locate within the range from 10000 to 50000 and range from 50000 to 200000, the frequency of the recovery operation is increased in order to run whenever the number of times the con the C of the roll paper passes the printing position, reaches 50 and reaches 30. When the accumulated number of times the operation is performed cutting, is 200,000 or more, the print head is subjected to a recovery operation, whenever the number of times the end of the roll paper passes the printing position reaches 10. At step S38, the drive motor 64 of the carriage actuates a linear carriage of the head, and part of the mechanism (mechanical part) (for example, the cover and cleaner) is actuated to move the print head 14 after the print operation or recovery from the print position to the covered position. As a result, the sequence of printing operations is completed.

As described above, when the accumulated number of times the cut operation is performed after the start of use of the cutter in an inkjet printing device, high frequency recovery operation increases in proportion. This may subsequently reduce the amount of dust (for example, paper dust)attached to the edge of the hole ejection printhead 14, in a safe manner, thereby preventing the deterioration of the printed image more securely.

The FOURTH OPTION EXERCISE

Next, the following section will describe the fourth variant of the implementation of the us is Otsego invention. It should be noted that the portions that coincide with parts of the first variant implementation in the third variant implementation, are denoted by the same reference numbers, and will be described only different parts. The fourth option implementation differs from the embodiments from the first to the third, however, that is the number of dots of ink ejection, and the restore operation is also performed on the basis of the emitted number of points.

With reference to Fig, the following section will describe the time at which executes the recovery operation of the print head in this embodiment. Fig - block diagram of the sequence of operations used to control the time at which the print head 14 is subjected to a recovery operation. In this embodiment, the print head 14 is subjected to a recovery operation to remove the dust (for example, paper dust)attached to the printhead 14. Another recovery operation is also done to remove the solidified ink from the ink attached to the printhead 14 (for example, ink mist). Depending on the purposes of the relevant recovery operations printhead 14 is subjected to a recovery operation using the negative pressure for suction and speed scanning unit 46 to the suction will clean the La, suitable for the respective recovery operations.

First, the printing operation starts after receiving the print command from the operator. Then, in step S41, the drive motor 64 of the carriage actuates a linear carriage head. At the same time part of the mechanism (mechanical part) (e.g., cover and cleaner) also operates to move the print head 14 from the covered position to the print position. At step S42, the actuator 66 of the conveyor motor controls the conveying roller 73 to transport the continuous sheet. Command from the CPU 62 controls and actuates the print head 14, thereby starting the printing of the image.

During printing, ink is ejected from the print head 14 can cause, in addition to the main drops of ink used for printing, small floating ink mist. This ink mist can be attached to the edge of the hole ejection printhead, thus causing poor performance, ejection of ink. To prevent this, the inkjet printing device of this variant implementation provides, in addition to the recovery operation for removing dust (for example, paper dust), another restore to remove ink mist attached to the printhead is 14. When the restore operation to remove ink mist attached to the printhead 14, the inkjet printer 100 is controlled so that the amount of emission of ink from the ejection holes were counted, and the recovery operation is performed when the counted number exceeds the number of emissions (the threshold value for the number of emissions).

When the number of emission of the ink is calculated and the image is printed on the sheet, the test image and the printed image is optically read. After that, at step S43, the drive motor 68 of the cutter actuates the motor 69 of the cutter on the basis of a command from the CPU 62 to cut the sheet to a predetermined length. At step S44, the actuator 66 of the conveyor motor controls the transport motor 67 for transporting the sheet, so as to complete the transportation of the sheet. On the basis of commands from the CPU 62, the print head 14 is controlled and driven so as to complete the printing of the image.

After the image is printed continuous sheet coming from the position of the roll after it is cut, re-wound on the initial part of the flow sheet at the step S45. At step S46, the number of operations re-winding is calculated to determine whether it is necessary or not is about to expose the print head 14 of the restore operation. When the number of times that the cut part of the media passes the printing position due to the operation of re-winding equals or exceeds the specified threshold value, the printing device is controlled so that the print head 14 has undergone a recovery operation at the step S47. When the restore operation to remove paper dust attached to the orifice of the ejection printhead 14, the edge of the hole emission is cleared by the block 46 of the suction cleaner, at the same time carrying out the absorption edge of the hole of the release.

When the restore operation for the purpose of removing paper dust attached to the edge of the hole ejection printhead 14, the suction is performed using a relatively high negative pressure. During this block 46 of the suction cleaner is scanned at a relatively small rate of 1.3 cm/sec in the direction, along which passes the array of the ejection holes. As described above, the restore operation in which the suction is performed using a relatively high negative pressure and the scanning is performed at a relatively low speed, means as operation B recovery. Operation B recovery provides a relatively high amount of suction, as the absorption is performed by using the Rel is a relatively high negative pressure and the scanning is performed at a relatively low speed.

At step S46, the number of times that cut off part of the media passes the printing position during the operation of re-winding is lower than a specified threshold, the number of points during the ejection of ink for printing is compared with the threshold value for the number of points at step S49. When the number of points equals or exceeds the threshold value, the operation is A restore step S50 to remove ink mist attached to the printhead 14.

As described above, in this embodiment, the number of emission of the ink is calculated, and when the number of emissions equals or exceeds the specified threshold value for the number of emissions, the block 46 purifier is operated so as to expose the print head 14 of the operation is A restore. During this CPU 62 operates as a control unit to control unit 46 purifier. When performing A recovery unit 46 of the suction cleaner is scanned in the direction, along which passes the array of ejection holes, at a relatively high speed of 5.1 cm/sec. Specifically, the scanning speed of the block 46 of the suction cleaner to perform the operation B recovery is lower than the scanning speed of the block 46 of the suction cleaner to perform A recovery. Specifically, the speed of cleaner used, when the number of times which cut off part of the media passes the printing position equals or exceeds the threshold value, lower than the speed of cleaner that is used when the number of emissions equals or exceeds the threshold value for the number of emissions, to allow the block 46 of the suction cleaner to clean the surface of the forming hole emission. When performing A suction recovery is performed using a relatively low negative pressure, and thus, the amount of suction is lower than when the operation B recovery, thus providing a relatively weak ability to delete the attached substance. Specifically, the negative pressure of the suction holes 22 to perform the operation B recovery is higher than the negative pressure from the suction hole to perform A recovery. As described above, the suction pressure when the restore operation, when the number of passes, which cut off part of the print media passes 4b printing, equals or exceeds the threshold that is higher than the suction pressure for the restore operation, when the number of emissions equals or exceeds the threshold value for the number of emissions. Negative pressure block 46 of the suction cleaner is in operation, A recovery is lower than neg is the emotional pressure block 46 of the suction cleaner is in operation B recovery. The scanning speed when performing A recovery higher than the scanning speed when the operation B recovery. Thus, when operation B recovery can be absorbed more attached matter than in the case of the operation of A recovery. Thus, the recovery operation B can also function as the operation is A restore. Specifically, the operation B recovery can mean the operation of A recovery. Thus, the number of dots of ink ejection is reset at step S48, not only when the operation is performed A restore, but also when the operation is performed B recovery.

After that, the drive motor 64 of the carriage actuates a linear carriage of the head and part 65 mechanism (mechanical part) (for example, linear head carriage, the cover and cleaner), so as to complete the printing in step S51. Then, the print head 14 after the restore operation is moved from the print position to the covered position, thus completing the printing operation. As described above, in this embodiment, the print head 14 is subjected to a recovery operation for the purpose of removing dust (for example, paper dust)attached to the print head 14, and another recovery operation is also performed to remove cheryln the th fog, attached to the printhead 14. This subsequently can reduce the influence on the emission of ink and paper dust attached to the edge of the hole ejection printhead 14, and can reduce the influence on the ink ejection of the ink mist attached to the edge of the hole emission. This subsequently can prevent the deterioration of the printed image more securely.

OTHER embodiments of

In this disclosure, "print" or "print" is used in the meaning including not only the information for forming characters and images, but also information that is meaningful or not meaningful. Regardless of whether the information in order to be perceived by the human visual perception, the invention refers to widely cover image, design or pattern, for example, formed on the media, or the processing of the media.

The term "media" or "sheet" is used in the meaning including not only paper, commonly used in the printing device, but also any material that can accept ink (for example, fabric, plastic film, metallic plate, glass, ceramics, wood or leather).

The term "ink" or "liquid" also have a similar way to interpret what I as having a broad meaning as in the definition of "print" ("print"). "Ink" means, when placed on the media, a liquid used for forming images, designs or patterns, processing media, or process ink (e.g., coagulation or transition into an insoluble form of coloring matter in the ink applied to the print media).

The term "nozzle" refers to comprehensively includes, unless otherwise noted, hole emission or the path of the fluid associated with the ejection hole, and an element that generates energy used to discharge ink.

Although the present invention has been described with reference to exemplary embodiments of the implementation, it should be clear that the invention is not limited to the disclosed exemplary embodiments of the implementation. The volume of the following claims must comply with the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

1. Inkjet printing device, comprising:
the printhead, which can throw ink;
the unit transportation for transporting media along the transport route, passing the printing position where printing can be performed on the print media through the printing is melting head;
cutter that can cut the media;
the recovery block to perform the recovery operation of the print head; and
a control unit for controlling the recovery operation performed by the recovery block based on the number of passes, which is the number of times that cut off part of media print, cut with the cutter passes the printing position.

2. Inkjet printing device according to claim 1, in which transportation can perform feeder for feeding media from a portion of the flow through the print position to the cutting position, in which the media is cut by the cutter, and return operation to return the media, which is located between the cutting position and a feeding position, in the feeding position,
the number of passages includes a number of times during the operation of the return, which cut off part passes the printing position.

3. Inkjet printing device according to claim 2, in which the number of passages includes a number of times during the operation of the feeder, which cut off part of the media passes the printing position.

4. Inkjet printing device according to claim 1, in which the inkjet printing device includes part of a coup for feeding print media to the printing position through the transport path after cutting by the cutter,while the upper side and the reverse side is upside down,
the number of passages includes a number of times, which cut off part of the media passes the printing position at the time of filing of the media part of the coup.

5. Inkjet printing device according to claim 1, in which the control unit causes the restore operation is performed whenever the number of passes is equal to or exceeds the threshold value.

6. Inkjet printing device according to claim 1, in which the control unit resets the number of passes, whenever you execute the restore operation.

7. Inkjet printing device according to claim 5, in which the threshold value decreases with increasing accumulation of the number of passes.

8. Inkjet printing device according to claim 5, in which the threshold value decreases with the increase of the cutting torch media.

9. Inkjet printing device according to claim 1, in which the recovery block includes at least one of the purifier unit for cleaning the surface of the forming hole emission, in which is formed a hole ejection printhead, a suction unit for sucking the attached matter attached to the surface of the forming hole emission unit preliminary ejection to eject ink, not affecting the print image, through the hole emission unit suction Voss is the resolution for intake and output of ink into the printhead through the hole emission, and block recovery with increasing pressure to increase the pressure of the ink in the printhead to bring the ink through the ejection hole.

10. Inkjet printing device according to claim 1, in which the control unit causes the block to restore to perform a restore operation, when the number of emission of ink from the print head is equal to or exceeds the threshold value for the number of emission of ink.

11. Inkjet printing device of claim 10, in which:
the recovery block is a block of cleaner for cleaning the surface of the forming hole emission, in which is formed a hole ejection printhead,
while cleaning speed with which the block purifier cleans the surface of the forming hole emission, when the number of passes is equal to or exceeds the threshold value, lower than the cleaning rate at which the block purifier cleans the surface of the forming hole emission, when the number of emissions equals or exceeds the threshold value for the number of emission of ink.

12. Inkjet printing device of claim 10, in which the recovery block is a suction unit for sucking the attached matter attached to the surface of the forming hole emission, in which is formed a hole ejection printhead, and
pressure is sesivany, with which the suction unit sucks the attached substance, when the number of passes is equal to or exceeds a threshold value higher than the suction pressure, with which the suction unit sucks the attached substance, when the number of outliers is equal to or exceeds the threshold value for the number of emissions.

13. Inkjet printing device according to claim 1, in which the recovery block is the block suction cleaner, which includes a purifier unit for cleaning the surface of the forming hole emission, in which is formed a hole ejection printhead, and a suction unit for sucking the attached matter attached to the surface of the forming hole emission, in which is formed a hole ejection printhead.

14. The way to recover the printhead in an inkjet printing device that includes a printhead through which can inject the ink, and the recovery block to perform the recovery operation of the print head, including:
the step of transporting the media along the transport route, passing the printing position where printing can be performed on the media of the printhead;
stage cutting media cutter; and
stage management recovery operation, the imp is used by the recovery block based on the number of passes, which is the number of times that cut off part of media print, cut with the cutter passes the printing position.



 

Same patents:

FIELD: printing.

SUBSTANCE: invention relates to an ink-jet printer in which the operation of restoring is performed in the print head for ejecting ink, and to a method for restoring the print head in the ink-jet printer. The ink-jet printer comprises a print head that can eject ink. The device also comprises a transportation unit, which serves for transportation of a recording medium along the transportation path passing the printing position in which printing can be performed on the printing carrier by the print head. The cutter which can cut the printing carrier. The restoring unit to perform operations of restoring the print head. The control unit to control the restoring operation performed by the restoring unit based on the number of passes which is the number of times that the cut-off part of printing carrier, which is cut off by the cutter, passes the printing position.

EFFECT: proposed invention provides the systematisation of the process of restoring the print head taking into account cutting of the carrier.

14 cl, 13 dwg

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