Device for sealing a fluid-jet printhead, the method of maintenance of an inkjet printhead and ink jet printing mechanism

 

(57) Abstract:

A device for sealing a liquid ejecting printing ink nozzles of an inkjet printhead during periods when the printer does not work, use a viscous-compatible print ink for inkjet printing, sealing liquid which is applied to the surface of the print head to clog the nozzle and to prevent drying of the ink in the print heads. Inkjet printing mechanism contains the printhead and service station, which retain the sealing liquid. For selectively applying a sealing liquid to the printhead service station includes an applicator mechanism containing a consumable item and sealing rubbing node through which carry the sealing liquid from the consumable element on the printhead. With rubbing node you can also clear the front surface of the printhead or this site may be used only for sealing the printhead. A method of sealing an inkjet printhead using a device for sealing a fluid, comprising the step shower, wypoczety. 3 S. and 7 C. p. F.-ly, 8 ill.

The present invention relates in General to inkjet printing mechanisms, and more particularly to a device for sealing a fluid-jet printhead of an inkjet printing mechanism during periods when the printing process is not carried out.

Background of the invention

In inkjet printing mechanisms use the printing elements, of which push out ink drops of a liquid are described here in General terms "printing ink" on the page of media. Each printing element contains the print head, provided with very small nozzles through which eject drops of ink. For image printing, the print head moves back and forth in the transverse direction of the page of media by ejecting drops of printing ink in accordance with the desired pattern in its movement. A specific mechanism for ejection of ink printhead may have a number of different forms, known to experts in the art, for example, such that use of the printing head with piezoelectric or thermal elements. For example, two previously known thermal mechanism for ejection is O. In the heating device, the barrier layer containing channels for printing ink, and the evaporation chamber is located between to allow the plate and the substrate. The substrate typically includes spaced rows of arrays of heating elements, for example resistors, which serves the energy for heating the ink in the evaporation chambers. When heated drop of ink ejectives (ejected) from the nozzle, which is engaged by a resistor. By selectively activating resistors while moving the print head in the transverse direction of the page of media printing ink is applied in the form of a pattern on the carrier for forming a desired image (e.g., picture, symbol or text).

To clean and protect the printhead usually determine the mechanism of "service station" on the chassis of the printer so that the print head can be moved through the station to perform maintenance. During storage or during those periods when the seal is not produced on the previously used service stations used to separate the device containing the cap elastomer with a sponge, which was surrounded by the printhead nozzles for creating a sealed upl the s were equipped with petrol caps attached to the pump to create a vacuum in the printhead. During operation, partial blockage or clot in the printhead were periodically cleaned by pushing the number of drops of ink through each nozzle when performing the cleaning process or "purge", known as "spraying". Waste ink is collected in part for waste collection tank of the service station, known as the "spittoon". After spraying, removal shelter or sometimes while printing on most service stations produce clean the print head using a flexible rubbing node, which wipe the surface of the printhead to remove residual printing ink, as well as any paper dust or other particles that have accumulated on the print head.

To improve clarity and contrast of the printed image of the earlier studies have focused on the improvement of the printing ink. To ensure faster, more water-resistant printing with darker blacks and more vivid colors were created print-based paint pigments. These printing inks based pigments have a higher solids content, Camuy optical density of the new printing inks. Both types of printing inks to dry quickly, allowing you to use smooth paper with mechanisms for inkjet printing. However, the combination of small nozzles and quick-drying printing inks makes printhead is sensitive to clogging not only drying printing inks and fine particles of dust or fibres of the paper, but also solid particles present in the new printing inks. Fully or partially clogged nozzle can lead either to pass or to the wrong direction drops on the storage media, each of these defects lower the print quality. Thus, the process of spraying the cleaning nozzles becomes even more important when using printing inks based pigments, because the content of the larger solid particles contributes to the problem of clogging, which is becoming more significant than previously used printing inks based dyes.

Last nodes for cleaning printheads usually consisted of a single or double knife, made of an elastomeric material. Typically, the printhead is moved relative to the rubbing of the node in the direction parallel is defined in two rows, perpendicular to the scanning axis, first rubbed first one row of nozzles, and then rubbed a different number of nozzles. An entirely different scheme wipe was used in the color inkjet printers DeskJetmodels 850, S, S and S Hewlett-Packard Co. where rubbing nodes move along the length of the rows of nozzles, wiping ink from one nozzle to another. This erasable printing ink acts as a solvent to remove precipitation printing ink, to allow accumulated on the plate. In these printers also use rubbing the site with two knives, and the knives have special contours of the top edge to ensure the best effect of absorption and subsequent cleanup.

When using the new printing inks based pigments are faced with problems of finding appropriate strategies for covering the print head, however as well as for adequate cover multicolor printhead when using printing inks based dyes. In the previously used devices to cover sealed chamber was placed around the nozzle for encapsulation of the printhead nozzles in a humidified atmosphere of the surrounding environment, whereby before the Vatan inkjet printers DeskJetmodels 850, S, S and S Hewlett-Packard Co. used elastomeric covering the camera with a unique sponge with lots of tabs to seal the writing element black pigment-based. Spring-loaded swinging carrier supported black and coloured caps and were mildly associated with print heads to prevent their discharge. A unique ventilation system that contained the cover firm Santopreneand labyrinth connection of ventilation ducts under the sled exclude unintentional discharge, and also adapted to changes in pressure in the surrounding space. Although the use of a fundamentally new service station, first introduced in the DeskJet printersthe model 850 and later models S, S and S allowed to shoot countless problems with new inks pigment-based, this service station had disadvantages. For example, covering the site, as well as refueling system, contained many moving parts, which service station required a series of complex manufacturing steps in the Assembly.

Brief description of the invention

In accordance with one feature of the us is surrounding mechanism at the time when printing is not produced. Service station contains a reservoir with a sealing liquid stored in the tank. The service station also includes an applicator by means of which put the sealing liquid from the reservoir to the printhead. In the illustrated embodiment, service station also contains the carrier, while the applicator contains a consumable device, by means of which serves sealing liquid from the reservoir sealing rubbing node. Sealing cleaning Assembly is mounted on the carrier and is designed to receive a sealing fluid from the metering device when the slides are in the position of spending, and for applying the obtained sealing solution on the print head during relative movement of the printhead and sealing rubbing node. Use several other methods to transfer the sealing fluid to the printhead and, preferably, injection of sealing liquid in the spray printing ink nozzles of the printhead.

In accordance with another feature of the present invention of an inkjet printing mechanism may be SN the plants developed a method of technical servicing an inkjet printhead of an inkjet printing mechanism during the period, when printing is not produced between the first and second episodes of print. The method comprises the step, following the first episode of printing, which consists in closing nozzles, spray printing ink, print head, liquid sealing substance at the time when printing is not produced. In the removal phase, which is produced before the second episode printing, liquid sealing substance is removed from the printhead nozzles. In the illustrated embodiment, the step of removing is accomplished by the shower of liquid sealing substance from the nozzles, using the same technology as when spraying ink from the nozzles when printing.

The General purpose of the present invention is to provide a method and device for sealing a fluid jet print engine, which provides improved print quality, the achievement of clear, bright images, especially when using fast drying printing inks based pigments, shoesadidas or based dyes, by creating a process of rapid and effective sealing of the printhead.

Another objective of the present invention is the creation of a service station for the printhead the stages of Assembly and thus, creating a more cost-efficient products for consumers.

Another objective of the present invention is to provide a method of sealing an inkjet printhead, which perform more silent and efficient manner. These tasks are solved by the features presented in the PP. 1-10 claims.

A brief description of the illustrations

Fig. 1 is a perspective view with a partial tear-out of one way of performing an inkjet printing mechanism, containing one embodiment of a device for sealing a fluid in accordance with the present invention;

Fig. 2 is a perspective view with a partial tear-out of one way of performing a service station, which contains the first variant of the device for sealing liquid, is shown in Fig. 1;

Fig. 3-5 are front sections in partially schematic view of a device for sealing a liquid, is shown in Fig. 2, which depicts the stages of the seal and remove seal with the printhead, while Fig. 3 depicts the distribution of the sealing liquid;

Fig. 4 - application of distributed gurmukhi before returning to the printing process;

Fig. 6 is a frontal section view in partially schematic form of a second design variant of the device for sealing liquid, is shown in Fig. 1;

Fig. 7 in an enlarged scale perspective view of a variant of implementation of the applicator sealing fluid device for sealing fluid, shown in Fig. 6;

Fig. 8 in an enlarged scale of the front section of the device for sealing fluid, shown in Fig. 6, showing the applicator, which performs the sealing nozzles of the printhead sealing liquid.

A detailed description of the preferred versions

In Fig. 1 shows the embodiment of an inkjet printing mechanism, which shows the ink jet printer 20, made in accordance with the present invention, which can be used for printing business reports, correspondence, publications using desktop publishing tools, etc. in industrial, domestic or other conditions. Commercially available various inkjet printing mechanisms. For example, some of the printing mechanisms that may be introduced by the present invention, whodat part of such devices. For convenience, the concepts of the present invention is illustrated by the example of an inkjet printer 20.

Although it is obvious that the components of the printer can vary from model to model, the typical inkjet printer 20 includes a chassis 22 surrounded by a housing or casing 24, typically made of plastic. The sheets of media are fed through the print zone 25 processing device 26, adapted to print on this media is made in accordance with the present invention. The media printed information can be any type of suitable sheet material, such as paper, stacks of cardboard, transparent media, Mylar (polyethylene terephthalate), etc., but for convenience, the illustrated embodiment is described using paper as the medium. The processing device 26 for printing contains the input tray 28 for storing sheets of paper before printing. A number of conventional transporting paper rolls (not shown) driven by the engine, can be used to move the print media from the input tray 28 in the print zone 25 for printing. After printing, the sheet stack on a couple of prints of the exterior of the drying flaps 30, shown exposed so that PR is on any pre-printed sheets, still considerable in the exhaust part 32 of the tray, before challenge with turning around, as shown by the arcuate arrows 33 to reset the newly printed sheet on the discharge tray 32. The processing device 26 for printing can contain a number of adjustment mechanisms to accommodate different media sizes, including sizes letter, legal document, a-4, envelopes, and so on , for example, a pull-out lever 34 to control the length and the groove 35 for feeding envelopes.

The printer 20 also includes a printer controller, shown schematically in the form of a microprocessor 36, which receives instructions from the host computer, typically a computer, such as a personal computer (not shown). Indeed, many of the functions of the printer controller can be performed by the host computer, the electronic system of the printer or through the interaction between them. The term "the printer controller 36," as this phrase is used here, covers these functions, either the main computer or printer or intermediate device located between them, or the combined interaction of these elements. The printer controller 36 may also show what poverhnosti housing 24. The monitor connected to the main computer, can be used to display visual information to the operator, for example, the printer status or a particular program that is currently executing on the host computer. Personal computers, devices for input, such as keyboard and/or mouse, and monitors are well known to specialists in this field of technology.

On guide rod 38 of the carriage mounted on the chassis 22, is an inkjet carriage 40 slidable reciprocating in the transverse direction of the print zone 25 along the axis 42 scanning, certain guiding rod 38. One suitable type of device for supporting the carriage described in U.S. patent 5366305 owned company Hewlett-Packard Co. , the assignee of the present invention. Normal driving can be used to drive the carriage 40, including positional feedback, which sends signals about the position of the carriage to the controller 36. For example, the leading mechanism of the carriage and the DC motor can be connected to drive the endless belt attached to the print carriage 40, and the engine operates in the CTE is ogenyi carriage controller 36 of the printer optical encoder reader may be mounted on the carriage 40 to read the encoded dashed line, located along the path of movement of the carriage.

The carriage is also moved along the guide rod 38 in the area of maintenance, which is designated in General by the arrow 44, which is located inside the housing 24. Area 44 maintenance is a service station 45, which may be made of various conventional functions maintenance of the printhead. For example, on the frame 46 of the service station may be established group of devices to service the print head described in more detail below. In Fig. 1 shows a tray for collecting waste ("spittoon") 48 service station, which is limited at least partially by the frame 46 of the service station.

In the area of 25 printed on the sheet of paper is applied printing ink inkjet cartridge, such as cartridge 50 for black printing ink and/or toner cartridge 52 for color printing inks. The cartridges 50 and 52 specialists in this area often referred to as "feathers" (printing elements). Shows a colored pen 52 is a tri-color pen, although some versions can be used to set a separate monochrome feathers. Although color pen 52 may contain printing ink on the base is asiala, for example cyan, yellow and Magenta. The pen 50 for black ink is depicted here as containing printing ink based on the pigment. It is obvious that other types of printing inks can also be used in the pens 50, 52, for example printing inks on the basis of thermoplastic substances, wax or paraffin, and printing inks mixed or composite type, with both the properties of dyes and pigments.

Pictured feathers 50 and 52 contain the capacity to store a certain volume of ink. The pens 50, 52 have the printheads 54, 56, respectively, each of which has a nozzle plate with a multitude of nozzles passing through the plate, is made known to experts in the art by the way. Pictured printheads 54, 56 are thermal inkjet print heads, although other types of printheads may be used, such as piezoelectric printheads.

Printheads 54, 56 typically include a substrate, in which there are many resistors associated with the nozzles. Through the activation of the selected resistor forms a gas bubble that ejects a drop of ink from soaphouse command control signals, which can be enjoyed using a conventional multi-strand belt loop (not shown) from the controller 36 to the carriage 40 printheads and through a conventional misidenti between the carriage and the pens 50, 52 to the print heads 54, 56.

Preferably, the outer surface of the plate to allow printheads 54, 56 lying in a common plane printheads. The distance between this plane and the carrier, known as the gap between the media and the printhead is an important component of providing quality printing. Various adaptations service station 45 can be adjusted relatively to the General plane of the printheads to ensure optimal conditions actions feathers. The right action of feathers not only improves the print quality, but also increases the longevity of feathers by maintaining "health" printheads 54 and 56.

Device for sealing liquid

In Fig. 2 depicts the preferred embodiment of the device 100 for sealing liquid, made in accordance with the present invention, and it is shown mounted in the checkpoint service station 101. using the fastened clip, rivets, screws or other fixing means inserted in the groove 103, performed in front of the base 102. To control the rise of the service components to service the printheads may be used in the adjustment mechanism (not shown) for coupling the frame, for example, using a pair of pins projecting from each side of the base frame 102, for example pins 104. As will be described below, the base 102 frames successfully plays the role of a "spittoon" (tray waste collection) 48, as shown in Fig. 1.

The chassis 22 or, preferably, the outer side of the base 102 can be used to set the regular motor service station, for example stepper motor 105, which receives control signals from the controller 36. Preferably, the engine 105 can be attached to the base 102 of the frame using a fixing means such as screws 106. Stepper motor 105 is operatively connected to the drive gear 108, which may contain one or more gears, belts or other drive means known to specialists in this field of technology to drive a variety of devices, service station, described below, or cover 110 of the frame 46, attached to the base frame 102, for example, preferably using molded fastened the hooks 112, or fasteners securing means or other means known to specialists in this field of technology. Gear 108 is associated with one of the pair of drive gears 114 of node 115 spindle - gear. A pair of gear wheels 114 are located on opposite sides of the frame 102 service station and are connected by the axle 116. Each of the pair of gear wheels 114 is associated with a corresponding toothed rack, for example with the rack 118, is made along the lower surface of the transmitting rolling pallet 120 to move the pallet 120 in the directions indicated by double-sided arrow 122.

The tray 120 can be moved to the front frame 46 (to the lower left side in Fig. 2) where it can be successfully used during the maintenance cycle, and this situation is considered primary. With the help of the engine 105 service station move the pallet 120 in this initial position up until the pallet is in contact with the base 102 of the frame and further movement in this direction will be impossible. In this initial position the program in the controller 36 of the printer's standard for movement of the tray 120 in position for sealing, wiping and spraying when servicing printheads 54, 56.

Shown in the illustrated embodiment, the inner part of the base frame 102 in a substantially closed to prevent splashing ink when performing another role, namely the role of the tray 48 for collecting waste ink discharged from the pens 50, 52. When the tray 120 is in the initial position under the front part of the cover 110 of the service station and the pens 50, 52 are in the position of maintenance over the service station 101, each printhead 54, 56 has an unobstructed path for spraying directly into the tray 48 for waste collection. The inner surface of the base 102 defines the lower surface 124 of the tray for waste collection, which can be lined with absorbent pad 126 to absorb the spray, preferably below the entrance to the tray 48. The absorbent pad 126 may be made of any material that absorbs the liquid, for example of felt, cardboard, sponges or other materials. One preferred material is a spongy material with open pores type SPR 100 shipped firm Time Release Science, Inc. (1889 Ul. Maryland Avenue, Niagara falls, new pieces-yo is regionalnej wiping nozzle plates of the respective black and color printheads 54, 56. Pictured rubbing node 130 for black ink is designed to effectively clean the black print head 54 through the use of two upward spaced apart mutually parallel blades 134 and 135, each of which has a special tapered upper contour. Rubbing node 132 for cleaning colored printing inks may also have two separated from one another mutually parallel upward knife 136 and 138 for cleaning the color print head 56, containing three printed dye-based colorants, such as cyan, Magenta and yellow. Wipe knives 134-138 can be secured to the pallet 120 in any conventional manner, for example by gluing with an adhesive, by ultrasonic welding or, preferably, using technology insertion molding, where the ground rubbing the knife passed through holes made in the pallet 120. In a preferred embodiment, wipe the knives and the flaps inserted and preferovany to the sheet metal, for example spring steel that can be bent and formed to provide a support for the knife, which can be fastened to the pallet 120. In the depicted embodiment, prelego rubber or other kauchukopodobnoe material, but preferably from ethylenepropylene monomer (EPDM) or other similar material known to specialists in this field. In the depicted embodiment, the black pen 50 contains printing ink based pigment, forming a sticky residue that resists wiping when using regular rubbing node as described above in the section "Background to the invention". Each wipe the knife 134 and 135 for the black paint finishes rubbing the edge of his distant region. Preferably, rubbing the edges had the form of a fork, and the number of teeth of the fork must be equal to the number of rows of nozzles on the respective printing heads, in this case, two prong fork for two rows of printhead nozzles 54. Thus, the cleaning blades 134, 135 have, each, a couple rubbing surfaces, sharp edges of teeth, forks, and these rubbing surfaces separated by depressions flat shape. In the depicted embodiment, each of the wiping edges is bounded on their outer sides with a hollow flat shape. These depressions between and adjacent to each side rubbing sharp edges represent the passage for the discharge of the adhesive, the cuffs rolled into balls particles print is and non-ferrous rubbing knife 136, 138 and the upper edge of the black rubbing of the blades 134, 135 are each facing outward rounded contour next to face outward surfaces of the knives. Against each rounded wiping edge rubbing of the top edge knives 134-138 may end at an acute angle or, more preferably, at a right angle next to the inward facing surfaces of the knives. Rounded edges contribute to the formation of a capillary channel between the knife and allow the plate to provide capillary leak of ink from the nozzle when cleaning the blades move along orthogonal rows of nozzles. This capillary after the ink is drawn by a rounded front edge rubbing the knife on to the next nozzle in the row, where the paint acts as a solvent for dissolving the dried sludge printing ink that has accumulated on the front surface plate of the printhead. Angle edge roaming after wiping knife then scrapes any insoluble precipitates with the front surface plate of the printhead. This means that, when the platform is moved toward the front of the printer (to the left in Fig. 3), black knife 135 and coloured knife 138 are leading and 134 and 136 are followed by knives, suscribase precipitation paint them tilted at an angle inside edges.

Color rubbing node 132 may be executed in the same manner as described above with respect to the black rubbing node 130, but preferably without depressions to reset. Instead, colored rubbing the blades 136, 138 are each rounded edges along their entire width, facing outwards, and the only angle wiping edge along their inner surface. For convenience, all black rubbing the blades 134, 135 and colored rubbing the blades 136, 138 will be further called rubbing nodes 130, 132, if there is any other notes.

To maintain the desired size and trajectory of the droplets of printing ink area around the printhead nozzles must be maintained in a reasonably clean condition. When using some of the previously known cleaning devices was carried out by wiping the plate to allow, and then rubbing the areas located next to allow plate, smearing ink across the bottom surface of the printhead. In other cases, rubbed the only nozzle plate of the printhead and ignored areas on the sides to allow the plate. As shown in Fig. 1, a color carriage 52 imeediately head, two wide flat area, or sidewalls, are formed on each side of the plate to allow the print head 56. In the older printers that use this type of cartridge, these sides were left not wiped. However, on the side sometimes recruited particles or precipitation of printing ink, then dust, fibers and other particles sticking to this precipitation. The remaining mastertime these particles on the sidewalls could then be fascinated by the paper during printing. If you have accumulated quite a large amount of pollution, then they could really spread printed paint, lowering the print quality.

To eliminate sources of pollution on the side of the depicted service station 101 includes cleaning elements 140, 142 for cleaning the side walls inside and out, named by their creators "flaps" (see Fig. 2). The flaps 140, 142 can be made of the same elastomeric material as rubbing nodes 130, 132. Indeed, the use of the elastomer of the same type for the manufacture of both rubbing nodes 130, 132 and flaps 140, 142 allows you to speed up the production process, as rubbing the knots and flaps can then be strmilov is th the preferred top of the flaps 140, 142 is a rectangle in cross-section, whose front and rear edges angled.

For sediment removal of printing ink from the upper edges rubbing nodes 130, 132 and flaps 140, 142, the cover 110 service station successfully equipped with a cleaning scraper 145, as shown in Fig. 2. Scraper 145 has a lower edge which is located lower than the upper edge rubbing nodes 130, 132 and flaps 140, 142. Thus, when the tray 120 is moved in the direction toward the front of the printer (to the left in Fig. 2), rubbing nodes 130, 132 and the flaps 140, 142 hit scraper 145 and successfully dropping any excess ink on the inner surface of the front cover 110 and substrate 102. This built-in cleaning scraper 145 is much more cost effective than previously used mechanisms that require the use of reasonably accurate Cam mechanisms of the scraper arms and drenched pads, which absorb excess liquids from sludge printing inks. After wiping and scraping rubbing the knots and flaps can be covered under the front protective case cover 110 in nachalnik way protected from contamination by accidental touching rubbing nodes 130, 132 and the flaps 140, 142.

Function rubbing nodes 130, 132 described so far relate to the passages for cleaning printheads 54, 56, so that when this function rubbing nodes 130, 132 can be called "cleansing wipe nodes". As mentioned above in the section "Background to the invention", in the previously used devices for sealing an inkjet printheads 54, 56, was applied elastomeric covering the cap with a sponge, which was in contact with the print head for maintaining humidity in the environment near the nozzles, which excluded the drying and decomposition of the ink inside the printhead. Instead of using such a quite complicated sealing device, which often contained a lot of moving parts, which often led to the increase in the cost of Assembly work from a standpoint of material costs and labor costs, in the present device 100 for sealing liquid used new and unique way of sealing the printheads 54, 56.

As shown in Fig. 2, the device 100 for sealing the liquid contains the node 150 to distribute the sealing fluid. Node 150 for distribution gidrogenit console part 155, which is directed upwards from the base 156 of the applicator 154. The base 156 of the applicator support in a stationary state by means of a tank, and it is inside the tank 152. Preferably, the applicator 154 was made of Polubarinova material, for example of thermosetting plastic material with open pores, for example of polyurethane foam or similar sintered polyethylene material.

Tank 152 contains a sealing liquid or sealant 158, which preferably is a viscous substance, comparable with spray inks, and which can be deposited on the printheads 54, 56 for sealing the nozzles of printheads at a time when the printer does not work. Preferably, the sealing liquid 158 was still a substance that will serve as a lubricant for the printheads 54, 56 when cleaning the aisles to prevent unwanted friction between the printing heads and/or rubbing nodes. Preferably, the sealing liquid 158 was hygroscopic substance, such as polyethylene glycol (PEG), lipanova glycol (LEG), diethylene glycol (deg), glycerin or other substance known to experts in asnami compounds which act as moisturizers that absorb moisture from the air, so they are a little dry for extended periods sealing. Thus, any leakage of the sealing liquid 158 from the reservoir 152 may be absorbed by the gasket 126 in the tray for waste collection, which then improves the absorptive capacity of the strip 126. After sealing the printheads 50, 52 any previously absorbed water can be released from hygroscopic substances for reducing the rate of evaporation from the nozzles.

One suitable sealing liquid 158 is the connection PEG, preferably having a molecular weight in the range of 100-1000, and more specifically a molecular weight of about 400. Other suitable sealing liquid 158 is the connection LEG, preferably having a molecular weight in the range of 100-1000, and more specifically a molecular weight of about 300-500. It is obvious that other equivalent compounds with a high viscosity may also be suitable, such as octanol, derivatives terpaksa and hydrocarbon oils with low molecular weight. Silicone oil is less suitable for use as the sealing liquid 158 because of their low surface to have a sufficiently low boiling point, to enable deleting them from the nozzles when spasciani. This means that the boiling temperature should be low enough to allow the sealant liquids boil when heated by the triggering resistor nozzle, so that the bubble liquid is blown out from a nozzle for ejection of fluid 158 during the next spraying. Substances with a very high viscosity, which is imposed on the nozzle plate, rather than embedded in the nozzle are not required to have an average boiling point.

Of course, the parameter determining the boiling point, is not a problem if they do not use thermal spray technology of printing ink when designing the printheads 54, 56. For example, if technology using the printhead with the piezoelectric viscosity of the sealing liquid 158 may be a determining factor when choosing the composition of the sealing liquid, rather than boiling point. Thus, it is obvious that the principles of operation of the device 100 for sealing fluid, described here as applied by thermal spray technology of printing ink can be applied with success in a number of different technologies PE is to move from the reservoir 152 upward under the action of capillarity in the United among themselves by micro-cells or channels of a porous material as long until it reaches the cantilever portion 155 of the applicator. As shown in Fig. 3, the cantilever portion 155 has a bottom surface that is lower than the upper edge of the wiping blades 134-138, to create a tight fit between the cantilever part 155 and knives 134-138, when the tray 120 moves rubbing nodes 130, 132 at the console of part 155. When this dense planting press cantilever portion 155 of the applicator, which pushes the fluid 158 of the applicator 154, and this allows rubbing nodes to gain the sealing liquid 158 on the upper edge rubbing nodes. It should be noted that in Fig. 3-5, the flaps 140, 142 are not shown for greater clarity of illustration.

After a set of sealing fluid in the cantilever part 155 of the applicator engine 105 service station continues to operate and moves the pallet 120 to the left (Fig. 2-4) to the print heads 54, 56. As shown in Fig. 4, when the contact printheads 54, 56 with rubbing nodes 130, 132 last passed the sealing liquid 158 on the nozzle plate of the print heads and it is preferable that the elastic rubbing nodes also whipped up some amount of sealing liquid 158 in the nozzle printheads. Forcing hermeti which ensures the sealing of the liquid directly on the printhead, which, if it does not touch, still clinging to allow the plate to ensure reliable sealing. After applying a sealing liquid, as shown in Fig. 4, the tray 120 can be retained in the initial position under the front cover 110. When you enter in this initial position is reset sealing liquid 158 with rubbing nodes 130, 132, with the upper edges rubbing their knives, scraper 145.

The process of removing the sealing liquid, which is part of the maintenance program, shown in Fig. 5, where the pallet 120 is moved from the initial position to erase the mass of any sealing liquid 158 from the surface of the printheads 54, 56. To complete the uninstall process of sealing liquid, which is part of the maintenance program, each printhead 54, 56 performs a series of actions shower to remove the sealing liquid 158 with nozzles (Fig. 5). The number and frequency of spasciani can be varied to select the desired mode for a specific nozzle size and other structural characteristics of a particular printhead. For example, it was found that the black pen 50 requires about 200 undergraduate, chtoli 158 was established, what is it with especial success applicable for the sealing of printing inks on the basis of the pigment, for example, dividing the black print head 50 in the depicted embodiment. There is a belief that the use of the compounds PEG helps to limit the penetration of the pigment particles in the nozzle, a phenomenon which may cause clogging of nozzles during prolonged periods when the printer is not working. thermal motion or Brownian motion, has a tendency to move the pigment particles from a nozzle filled with a more viscous sealing liquid 158 in the direction of less viscous composition of printing ink in the cartridge 50, 52. In addition, the use of substances PEG as the sealing liquid 158 may also hinder the diffusion of solvent or other molecules that are components of the compositions of sprayed ink in the atmosphere, thereby preventing decomposition of ink remaining inside the pens 50, 52. In addition, the use of very viscous lubricants, such as PEG, as the sealing liquid 158 allows you to successfully lubricate the outer surface of the printheads 54, 56, which prevents formation is ASS="ptx2">

As shown in Fig. 3, the sealing liquid 158 on the edge of the porous material 154 is under negative pressure, since the porous material is located below the upper edges rubbing nodes 130, 132. However, in the case of sealing liquids with higher viscosity or higher surface energy of the porous mass may be higher than the designated contact of the applicator with it, causing a positive pressure to ensure optimal fluid supply.

Although in the embodiment shown in Fig. 2-3 shows rubbing nodes 130, 132, which performs two functions: first, as a cleansing cleaning units for cleaning printheads 54, 56, and second, as a sealing rubbing nodes, covering the printheads 54, 56, when applied sealing liquid 158 on them. Use rubbing nodes 130, 132 to perform these two functions allow you to successfully reduce the number of parts required to assemble a service station 101; however, the effect can be improved by using two separate sets of rubbing nodes: one for cleaning and one for sealing to optimizes the sealing liquid, made in accordance with the present invention, in which separated these two functions are rubbing nodes. Here the pallet 120 is equipped with a cleansing wipe nodes 130, 132, as described above (Fig. 2-5) installed near the front part 162 of the pallet 120. Along the rear side 164 of the pallet has at least one, and in an arbitrary embodiment, two or more sealing rubbing node 165. Rubbing nodes 165 may be made of a tech materials, which have been described above in connection with the cleansing wipe nodes 130, 132. As shown in Fig. 7, it is preferable that the remote upper edge of the sealing rubbing node 165 was performed with a number of ribs 166, separated from one another by grooves 168. Alternating ribs and grooves 166, 168 form protrusions and depressions respectively. When you set the sealing liquid 158 from the applicator 154 ribs 166 are bent, opening groove 168 to accumulate the volume of the sealing liquid 158 in the groove 168. Away from the cantilever part 155 of the applicator, sealing rubbing nodes 165 back in the "standing" position, as shown in Fig. 7, from a bent position shown in Fig. 6. Leaving the area of the applicator, flexible by nature ribs 166 so navok 168 is extruded on the top edges of the ribs 166, where the sealing liquid can then be freely applied on the printheads 54, 56.

In Fig. 8 shows a detailed view of the print head 54 for the black pen 50, to illustrate the application stage

the sealing liquid 158 on the printhead. Printhead 54 is described in U.S. patent 5420627 owned by the owner of the present application, the Hewlett-Packard Co. and in one commercially supplied version of the printhead, there are only approximately 300 nozzles arranged in two mutually parallel rows of nozzles 150 each. The sealing liquid 158 (shown as small dots) (Fig. 8) typed in the grooves 168 rubbing node and it is applied to the printhead 54.

The cartridge 50 has a plastic housing 170 that defines a channel 172 for supplying printing ink which communicates with the capacity for printing ink, located in the upper part of the cartridge is rectangular in shape (Fig. 1). The housing 170 also has an elongated wall 173, which limits the cavity 174 at the lower edge of the feed channel 172. The mechanism 175 ejection of ink is located in the middle of the cavity 174 and held in place by a bonding layer 176 of adhesive to the elastic polymer is valentim materials well-known experts in this field. Depicts a ribbon 178 serves to allow the plate in which the two parallel rows of offset in staggered nozzle apertures 180, for example, using laser ablation technology. The adhesive layer 176, which may be made of epoxy resin, melt the binder, of a silicone compound that hardens under the action of ultraviolet rays, or mixtures thereof, forms a hermetic seal against the penetration of printing ink between the elongated wall 173 and tape 178.

The mechanism 175 ejection printing ink contains silicon substrate 182, which contains many individually include thin-film starts resistors 184, each of which is in General behind each nozzle 180. Triggering resistors 184 act as resistive heaters in selective incorporation through the one or more signals to activate or trigger pulses. These trigger pulses are received from the controller 36 by a flexible conductor to the cartridge 40 and then through electrical interconnects to the conductors (not shown for clarity of the drawing), which carries a polymer tape 178. The barrier layer 186 can be s layer 186 may be a layer of photoresistive or any other polymer, which in combination with the tape 178 forms an evaporation chamber 188, each of which surrounds an associated triggering resistor 184. The barrier layer 186 glued to the ribbon 178 thin layer of glue (removed from Fig. 8 for clarity), for example, devulcanizing layer composition of polyisoprene photoresist. During printing, the printing ink from the feed tank enters the flow channel 172 around the edges of the substrate 182 and into the evaporation chamber 188. When running the resistors 184 include during the removal process of the sealant, the ink in the evaporation chambers 188 is pushed as well as the sealing liquid 158, as shown in Fig. 5.

Thus, in Fig. 8 the sealing liquid 158 is shown deposited on the outer surface of the belt 178 and introduced into the evaporation chamber 188 is preferable to surround the triggering resistor 184. Thus, the ink flow channel 172 is isolated from the effects of the atmosphere and atmospheric conditions, to prevent drying and decomposition of printing ink during periods when the printer does not work.

It is obvious that depicted checkpoint service station 101 may be replaced by various other mechanisms servicescape, described here can be easily adapted to a rotary mechanism, service station, for example, used in commercially supplied inkjet printers DeskJetmodels 850, S, S and S, manufactured by Hewlett-Packard Co. in Palo, Alto, PCs California). Indeed, a number of different mechanisms can be used for applying a sealing liquid on the printheads 54, 56. Using a reciprocating printhead shown for example only, as the principles illustrated in the device 100 for applying a sealing liquid, can also be used in the case of an array of nozzles of printheads extend across the full width of the page. Each device for applying a sealing fluid width in the entire page, the sealing liquid 158 may be caused by the introduction of the applicator directly in contact with the plate to allow or through the use of an intermediate applicator device, such as a rubbing node, which uses the principles described above for passing the service station 101.

Thus, in step way maintenance printheads 54, 56 may be started after the print is tion in the tray for waste collection 48 can be made passages cleansing wipe nodes to remove any precipitation, accumulated during previous episode of the printer. After this is carried out in accordance with the maintenance programme, shower and/or phase wiping, rubbing nodes 130, 132 can be cleared of any precipitation printing ink by crossing them under the scraper 145, after which the pallet 120 is moved to a position where rubbing nodes 130, 132 or 165 are held under the console 155 applicator. At the exit from the zone of the applicator rubbing nodes 130, 132 or 165 then move for applying a sealing liquid 158 on the printheads 54, 56, as shown in Fig. 4 and 8. After applying the sealant liquid tray 120 can be moved to the initial position under the front covering part of the cover 110, leaving the printheads 54, 56 hermetically sealed at the time when the printer 20 does not work. Upon receipt of the signal to the print controller 36 begins to perform part of the maintenance program, consisting in removing the sealing liquid. The sequence of actions when depressurization is shown in Fig. 5, where the sealing liquid 158 is removed from the printheads 54, 56 spraying, and this operation is preceded by, or in the course of its manufacture, or predpochtitel the cleaning and sealing liquid 158 with the printhead, followed by the final stage of cleaning, the pens 50, 52 are again ready to print.

In an alternative embodiment, the distribution device 150 can be moved on the frame 46 service station so that it is located within the other service devices, for example in the extreme right position in Fig. 1, so that the printheads 54, 56 can move directly over the top surface of the cantilever portion 155 of the applicator. This embodiment of the printheads 54, 56 can press on the applicator 154, squeezing the sealing liquid 158 of the upper surface of the cantilever part 155, so that the sealing liquid can be directly printed on the print heads without the use of an intermediate cleaning elements 130, 132, 165. One disadvantage of such a device may be a General increase in width of the printer 20, as the length of the trajectory of scanning along the guide rod 38 of the carriage (Fig. 1) should be increased, but this factor may not be a problem in other versions of the introduction, where the size of the printing mechanism does not cause anxiety. In other alternative versions distributing device 150 may be installed on the bearing sealing fluid without the use of an intermediate applicator element, for example rubbing nodes 130, 132 or 165. Indeed, rather than applying a sealing liquid 158 on the printheads 54, 56 when the relative motion of the applicator 154 and printheads, the sealing liquid can be deposited on the print heads, for example, sputtering. It is obvious that various modifications can be made to fit to various sizes and forms of printing mechanisms and inkjet printheads using the principles illustrated here, for sealing the printhead liquid sealing substance on the time periods when the printer is not working. Alternative hygroscopic substances for use as the absorbent liquid 158 may serve preferably hydrophobic oil, which does not absorb the moisture and would not be sensitive to drying, however, may require a fill operation to remove hydrophobic oil nozzles in addition to/or instead of a shower to clean nozzles.

Benefits

The advantages achieved using a device for applying a sealing fluid, is illustrated here. One significant advantage is menshenina. One of the special advantages of the version shown in Fig. 2-5, is to further reduce the number of parts required in the node service station, when using one set of rubbing nodes how to clean the print head, and for sealing the printhead using the sealing liquid 158. When using a separate set of cleansing wipe nodes 130, 132 in combination with one or more separate sealing rubbing node 165, all those rubbing nodes 130, 132 and 165 may be formed on the pallet 120 in one production cycle, for example, using the technology of molding paste. In addition, the use of specially designed sealing rubbing node 165 in addition to the cleansing wipe nodes 130, 132 allows to achieve rubbing each node has a special circuit that improves the execution of both tasks: cleaning and sealing.

1. Service station (101) for sealing ejecting ink nozzles (180) inkjet printhead (54, 56) in an inkjet printing mechanism (20) for the time periods when the printer does not work, comprising: a reservoir (152), a sealing fluid 15 is C reservoir (152) on the printhead (54, 56), leaving the sealing liquid (158) stuck to the printhead (54, 56) for sealing nozzles (180).

2. Service station under item 1, in which by means of an applicator (154, 130, 132; 165) carry sealing liquid (158) on the printhead (54, 56) with a relative movement of the printhead (54, 56) and the applicator (154).

3. Service station under item 1 or 2, which further comprises a carrier (120) positioned for movement between the position of an expenditure, and another position, and the applicator (154) includes a valve (155) through which serves sealing liquid (158) from the reservoir (152), sealing rubbing node (130, 132; 165) mounted on the carriage (120) for receiving a sealing fluid (158) from the distributor (154) when the slide (120) are in the position of spending, and for applying the obtained sealing fluid (158) on the printhead (54, 56) with a relative movement of the printhead (54, 56) and sealing rubbing node (130, 132; 165).

4. Service station on p. 3, in which the sealing rubbing node (165) has an applicator edge in contact with the printhead when applying the sealant Jidkova them in sealing fluid (158) from the distributor and the transfer of sealing fluid (158) on the printhead (54, 56).

5. Way maintenance inkjet printhead (54, 56) inkjet printing mechanism (20) in the period when the printer does not work, between the first and second episodes of print containing following the first episode printing stage sealing ejecting ink nozzles (180) printhead (54, 56) of the liquid sealing substance (158) during the period when the printer is not working, by keeping the liquid sealing substance (158) in adhering to the print head condition, before the second episode printing step of removing the liquid sealing substance (158) with nozzles (180) printhead.

6. The method according to p. 5, in which the step of sealing includes the injection of liquid sealing substance (158) in the nozzle (180) printhead, and the step of removing includes the operation shower liquid sealing substance (158) with nozzles (180) printhead.

7. The method according to p. 5 or 6, in which the step of sealing includes applying a liquid sealing substance (158) on the intermediate element (130, 132; 165) and, in the case of relative movement of the intermediate element (130, 132; 165) and the printhead (54, 56), transferring at least a certain amount of liquid germ is the yubom of PP. 5-7, further comprising stages: the preservation of the sealing material (158) in the tank (152) to seal the moving liquid sealing substance (158) from the reservoir (152) in distributing part (155) of the applicator (154) due to capillarity.

9. Inkjet printing mechanism (20) containing an inkjet head (54, 56) having a nozzle (180), ejecting ink, a service station (101) for sealing an inkjet printhead in those periods when the printer does not work, containing reservoir (152), the sealing liquid (158) stored in the tank (152), the applicator (154) through which carry the sealing liquid (158) from the reservoir (152) on the printhead (54, 56), leaving the sealing liquid (158) stuck to the printhead (54, 56) for sealing nozzles (180).

10. Inkjet printing mechanism according to p. 9, in which service station (101) also includes a carrier (120) positioned for movement between the position of an expenditure, and another position, and the applicator (154) includes a valve (155) through which serves sealing liquid (158) from the reservoir (152), sealing rubbing node (130, 132; 165) mounted on the carriage (120), for preamble application is received a sealing fluid (158) on the printhead (54, 56) when there is relative movement of the printhead (54, 56) and sealing rubbing node (130, 132; 165).

 

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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