Printing device

 

The invention relates to the printer, suitable in particular for use in machines for packing cigarettes. Printing device comprises a print head, the electromagnet and the armature. The latter is made of a ferromagnetic material and made movable in the direction from and to the printhead under the influence of a magnetic field generated by the electromagnet. The device also includes a feeding device for feeding the sheet to the print station in position between the anchor and the printhead and management tool designed to enable the electromagnet to attract the armature to a fixed print head, clamping, thus, the sheet between the armature and the print head. This embodiment of the device allows you to adjust the force with which each workpiece (sheet) enter into contact with the print head simply and quickly by changing the current supplied to the coil. 12 C.p. f-crystals, 3 ill.

The invention relates to the printer.

In particular, the present invention relates to the printer, suitable for use in machines for packing cigarettes, which include the subsequent Opicina material, used in a packaging machine.

Known machines for packing cigarettes usually contain a printing device for printing a code on the blanks, providing the possibility of identification, such as date and/or place of manufacture of the corresponding stack.

In the above-mentioned packaging machines printing device, in turn, contains a slot designed to hold the workpiece and located on the rotating wheel, which moves the workpiece along a path that passes through the print station. The print station includes an actuator by which the print head down to the nest and away from the nest so to print the above code on the workpiece held in the socket.

The above-described printing device is usually equipped with a deformable elastic element that is inserted between the above-mentioned actuator and the print head or between the seat and the wheel and which can be adjusted to calibrate the force with which the print head acts on the workpiece.

During said printing device exposes shaft bearing wheels relatively large loads, minute). Since they have to withstand such loads, shaft bearing and corresponding slots should be very strong and are therefore very expensive.

In addition, in the above-mentioned printing device, it is extremely difficult to adjust the force with which the print head acts on the workpiece, as mentioned force depends on the elastic properties of the deformable element, from the relative position of the print head and socket and from the trajectory of the actuator.

The aim of the present invention is to provide a printing device devoid of the above-mentioned disadvantages and at the same time simple in construction and cost effective to manufacture.

In accordance with the present invention of the printing device differs in that it includes a printhead placed on the print station for printing a graphic symbol on a sheet; an electromagnet placed on the print station; anchor, made of ferromagnetic material, which is moved to and from the printhead under the influence of a magnetic field generated by the electromagnet; feeding means for feeding the sheet to the print station in position between the armature and the print is anchored to the printhead.

The present invention is described below with reference to the accompanying drawings, which shows a variant embodiment of the invention, not limit its application and patent protection, and on which is shown:

in Fig.1 is a side view, in which some parts removed for clarity of the drawing, the preferred option exercise device made in accordance with the present invention; and

in Fig.2 is a detail of the device shown in Fig.1, on an enlarged scale in cross-section along II-II in Fig.1;

in Fig.3 is a detail of the device shown in Fig.2, in an enlarged scale.

In Fig.1 (see the accompanying drawings) position 1 indicates the entire packaging machine of continuous action, containing driven by the motor packing wheel 2, is designed to rotate when continuous motion (counterclockwise in Fig.1) about its axis (not illustrated) perpendicular to the plane of the drawing in Fig.1. Wheel 2 contains many uniformly distributed over the periphery of the nests 3 (only one shown) for receiving the sequence is made of folded pieces (sheets) 4, made of cardboard or similar m the device 7, located between the capture station S1, which is located at the open base surface 8 store 5, and the feed station S2, located about packing wheel 2 and designed to receive workpieces 4 open base surface 8 and feed them successively to the socket 3.

The gripper 7 contains the driven wheel motor 9, which rotate continuously clockwise in Fig.1, relative to the stationary Central axis 10 parallel to the axis (not shown) of the wheel 2 and perpendicular to the longitudinal axis 11 of the store 5. The wheel 9 has an internal chamber 12 (shown only partially), is pneumatically connected by a pipe 13 with the vacuum pump 14, designed to create the vacuum in the inner chamber 12 so that the pressure in the inner chamber was lower than the external atmospheric pressure.

The camera 12 is connected (in a known way, not shown) with many pneumatic exciting heads 15, which carries the wheel 9, evenly distributed about the axis 10. Exciting head 15 is connected with the wheel 9 by means of the levers 16, each of which is pivotally connected to the wheel 9 by means of axis 17 (see Fig.2) with the possibility of oscillation of the lever 16 relative to the wheel 9 around the axis 18, PA-the m 16 with the possibility of fluctuations relative to the arm 16 about the axis 19, parallel to the axis 10.

The angle of rotation of each lever 16 about the axis 18 are controlled by a Cam control mechanism (of a known type, not shown) placed in the wheel 9. The angle of each exciting head 15 relative to the axis 19 is controlled by another Cam control mechanism (of a known type, not shown) placed in the wheel 9 and is mechanically connected with the exciting head 15 of the lever mechanism 20 containing the lever 21, pivotally connected with the wheel 9 with the possibility of oscillation about the axis 18 under the action of the hollow shaft 22 (see Fig.2) in which the corresponding axis 17, and a connecting rod 23, one end of which is pivotally connected to the lever 21 and the other end pivotally connected with the exciting head 15 with the possibility of fluctuations relative to the exciting head 15 about an axis 24 parallel to the axis 10.

As is better shown in Fig.2, each cylinder 15 in substantially has the shape of a plate, one side of which is connected to the lever 16 and the other side is limited the exciting surface 25, which defines the recess 26, a limited annular rim 27 and attached to the chamber 12 by a pipe 28, made in ricaga extent defined by the upper surface of the knob 27.

Each pipe 28 from junction 29 of the connecting pipe 28 with the corresponding cylinder 15 is a valve 30 that is designed for opening and closing the pipe 28 so that a communication between the pipe 28 and the recess 26 or was or was stopped. Each cylinder 15 is also provided with a through hole 31, which provide constant communication between the recess 26 and the surrounding atmosphere.

Each valve 30 has a known construction with mechanically operated and is controlled by using the rod 32, is designed so that it can move in the axial direction, radially with respect to axis 10, with the driving Cam mechanism (of a known type, not shown) placed in the wheel 9, between "open" position (shown in Fig.2), wherein the recess 26 is pneumatically connected to a pipe 28 and, consequently, with the camera 12, and a closed position (not shown), wherein the recess 26 is pneumatically isolated from the pipe 28 and, therefore, from the camera 12.

In order to hold the workpiece 4 in contact with exciting surface 25 of the head 15, the surface 25, in essence, is introduced into contact with the workpiece 4, which closes the recess 26 and, together with the recess forms a vacuum-camerana 30 and therefore, enter the vacuum chamber in communication with the chamber 12, in which the pump 14 in constant depression.

The pressure loss caused by the presence of the through hole 31, permanently connected with the surrounding atmosphere, do not create any problems, since the pump 14 can compensate for even greater levels of pressure losses, for example, such as that caused by a through hole 31.

In order to release the workpiece 4, automatically restore atmospheric pressure in the vacuum chamber due to the presence of holes 31, simply by closing the valve 30.

As shown in Fig.1, each chamber 3 is made on the outer surface 33 of the head 34 against the inner part of the head 34, which is connected with the wheel 2 with the possibility of fluctuations relative to the wheel 2 around the axis 35 parallel to the axis 10, under the action of the Cam-swinging control mechanism (of a known type, not shown). Each socket 3 has two side surfaces 36, located at an angle to one another and to the bottom surface 37, in which the holes 38 for communication with a device for collecting a known type, which is not shown.

The constant rotation of the wheel 9 on the shaft 10 causes each cylinder 15 peremeditsiini capture S1, on which the head 15 grip the workpiece 4 with an open base surface 8 of the shop 5, through the print station S3, at which the printing device 39 type code (not shown) on the workpiece 4, and through the feeding station S2, on which the head 15 is passed the workpiece 4 slot 3 packing wheel 2.

The above code (not shown) usually consists of letters and numbers, or it can be a bar code, and it usually includes the date and/or place of manufacture of the stack.

As shown in Fig.2, the printing device 39 includes a supporting shaft 40, mounted on the car 1 with the possibility of oscillation about the axis 41 parallel to the axis 10, under the influence of a Cam control mechanism (of a known type, not shown), on which is rigidly fixed to the electromagnet 42, containing the core 43 of ferromagnetic material, with a pair of opposite pole shoes 44, between which is located the chamber 45, through which is threaded a shaft 40.

In the chamber 45 and, consequently, between the pole shoes 44 posted printing mechanism 46, which is rigidly fixed on the shaft 40 and is provided with the print head 47, which is designed for printing a code on the workpiece 4.

The electromagnet 42 also includes a coil 48 with adjustable amperage, moreover, the current is generated by the control device 49 is electrically connected to the coil 48.

As shown in Fig.3, each gripping head 15 contains the anchor 50, made of a ferromagnetic material and having a flat outer surface 51, which is designed for holding the workpiece 4, which is mounted for movement in the recess 26 in the direction indicated by POS. 52 perpendicular to the axis 19, against the action of a pair of springs 53, put on a pair of fixed fingers 54, along which the anchor 50 can be moved.

Each spring 53 is installed in a compressed state between the armature 50 and the upper head 55 of the corresponding finger 54 so that the anchor 50 in normal condition holds in the initial position (see Fig.3A), in which the surface 51 is located at a specified distance other than zero from the respective workpiece 4. The upper surface 56 of each head 55 is a base from which touches the workpiece 4, when her holding a respective exciting head 15.

The action machine 1 is described below with reference to one gripping head 15, starting from the moment when the gripping head 15 disengages the workpiece 4 in the socket 3 Pete is uhvatiti following preparation 4.

While moving from the supply station S2 to station S1 capture the valve 30 of the head 15 is held in the closed position and the Cam control mechanism (of a known type, not shown) inform the lever 16 leading oscillation (clockwise rotation in Fig.1) about the axis 18, which continue up until the head 15 is moved along the path P reaches the position close to the feeding station S1. When the head 15 comes close to the station 31, the Cam control mechanism (of a known type, not shown) inform the lever 16 delay variation (counterclockwise rotation in Fig.1) relative to the axis 18 and simultaneous oscillation (clockwise rotation in Fig.1) head 15 relative to the axis 19 so that the head 15 is essentially stops in position against the base surface 8 store 5 and, at the same time, the cylinder 15 push outward in the radial direction up until it is in contact with the workpiece 4 which is in contact with the base surface 8, and the cylinder 15 is thus pressed in the direction of the axis 11 in the inner zone of the store 5 with a certain pressure to the workpiece 4.

When the head 15 is moved forward inside the store 5 in the direction of the axis 11, is in contact with the surface 25.

When the workpiece 4 "sticks" to the surface 25, the cylinder 15 report oscillatory motion (clockwise rotation in Fig.1) about the axis 19, providing the possibility of deformation of the first region of the workpiece 4, i.e., the lower edge of Fig.1, and free from tooth 5A, limiting the base surface 8, then release the second edge (upper edge in Fig.1) of the workpiece 4 from under another tooth 5b, limiting the base surface 8, thus ending with the selection of the workpiece 4 with the base surface 8.

At this point, using the Cam control mechanism (of a known type, not shown) interrupt inhibiting oscillation of the lever 16 about the axis 18, and by rotation of the wheel 9 head 15 away from the capture station S1, where she captured the workpiece 4, and move the print station S3.

While moving from station S1 capture the print station S3, using the Cam control mechanism (of a known type, not shown), the lever 16 report leading oscillation (clockwise rotation in Fig.1) about the axis 18, which continue up until the head 15 is moved along the path P reaches the position close to the print station S3.

When the head 15 is close to the ASU 16 report of the inhibiting oscillation (counterclockwise rotation in Fig.1) relative to the axis 18 and simultaneously inform oscillation (clockwise rotation in Fig.1) head 15 relative to the axis 19 so, the head 15 is essentially stops at the specified time interval in position against the printing device 39 (see Fig.2), which, in turn, and for the same purpose, completes the corresponding oscillation about the axis 41.

In accordance with another embodiment of the invention, not shown in the drawings, the shaft 40 is fixed axis and the device 39 is not reported oscillatory movement about the axis 41.

At the print station S3 and during the above interval, the workpiece 4 is in position (see Fig.2) between the armature 50 and the print head 47. The controller 49 then supplies to the coil 48 current of a predetermined current to generate around the core 43 of the magnetic field that attracts the armature 50 to the pole shoes 44 against the action of springs 53, further movement of the armature 50 toward the pole shoes 44 enters the surface 51 of the anchor 50 into contact with the corresponding inner surface 57 of the workpiece 4 by introducing the outer surface 58 of the workpiece 4 into contact with the print head 47 with a predetermined force depending on the elastic force generated by the springs 53, and the strength of the magnetic field, which, in turn, depends on the strength of the electric current passing through to the 50 is returned under the action of springs 53 to its original position (see Fig.3A), and the Cam control mechanisms (known type, not shown) interrupt inhibiting oscillation of the lever 16 about the axis 18, and by rotation of the wheel 9 head 15 away from the print station S3 and move to a feeding station S2.

During the move from print station S3 to the power station S2 with the Cam control mechanism (of a known type, not shown) the lever 16 report leading oscillation (clockwise rotation in Fig.1) about the axis 18, which continue up until the head 15 is moved along the path P reaches the position close to the feeding station S2.

When the head 15 comes close to station S2, using the Cam control mechanism (of a known type, not shown) the lever 16 report of the inhibiting oscillation (counterclockwise rotation in Fig.1) relative to the axis 18 and simultaneously inform oscillation (clockwise rotation in Fig.1) head 15 relative to the axis 19 so that the head 15 is essentially stops at the specified time interval in position against the slot 3 of the packing wheel 2 and, at the same time, the cylinder 15 push out up until the gripping surface 25, in essence, not note the ke 34, which made Jack 3, also reported an oscillatory motion about the axis 35 to hold the gripping surface 25 and the bottom surface 37 in the position opposite one another and essentially parallel to one another.

While essentially radial displacement of the surface 25 toward the bottom surface 37 of the suction of the recess 26 is interrupted, turning the valve 30 in the closed state and, at the same time, include the suction through the holes 38 so that the workpiece 4 is left in the socket 3 and remained in the nest 3 pneumatically.

At this point, using the Cam control mechanism (of a known type, not shown) interrupt inhibiting oscillation of the lever 16 about the axis 18, and by rotation of the wheel 9 head 15 away from the supply station S2 and move to the capture station S1.

The above-mentioned operation is repeated cyclically.

It is obvious that after the above-mentioned fluctuations (turns clockwise in Fig.1) head 15 relative to the axis 19 during stages in which the head is moved in the direction of the stations S1, S2, S3, followed by a return fluctuations (turns counterclockwise in Fig.1) about the axis 19 during the execution of subsequent phases, during which the workpiece 4, giving it a U-shape along the previously marked lines bend (of a known type, not shown), when the workpiece is fed into the chamber 3.

The above description clearly shows that during operation of the printing shaft (not shown) of the wheel 9, the axis 17 and the hinges indicated by POS. 19, is not subjected to any impact that occurs during contact between the armature 50 and the print head 47, as such shocks are absorbed by the axis 40. In addition, the force with which each workpiece 4 is introduced into contact with the print head 47 can be adjusted even during operation of the machine, a simple, fast and accurate way by regulating the current supplied to the coil 48.

Claims

1. Printer containing a printhead located at the print station for printing a graphic symbol on a sheet; an electromagnet placed on the print station; anchor, made of ferromagnetic material and movable toward and from the print head under the influence of a magnetic field generated by the electromagnet; feeding means for feeding the sheet to the print station in position between the armature and the print head; a management tool, is under item 1, in which the print head is made in one piece with the electromagnet.

3. The device according to PP.1 and 2, in which the electromagnet comprises a pair of pole shoes, which during operation is located against the armature and the print head is located between the pole shoes.

4. Device according to any one of paragraphs.1-3, in which the electromagnet includes a coil, and a management tool comprises a generator intended for the excitation of the electric current controlled current in the coil circuit.

5. Device according to any one of paragraphs.1-4, which contains elastic means, and the anchor is movable in the direction of the printhead against the action of elastic means, and the printhead is mounted in a fixed position.

6. The device under item 5, in which the resilient means comprises a pair of springs.

7. Device according to any one of paragraphs.1-6, in which the anchor is based on the supply means.

8. The device according to p. 7, in which the feeding means includes a conveyor passing through the print station and, in turn, contains a gripping head for gripping the sheet, and the anchor is installed in an exciting head to move.

9. The device under item 8, in which the feeding means includes, at IU the pressure in the cavity, moreover, the means for collecting includes a pipe, a chamber connected with a cavity, a control valve located in the pipe, and a vacuum pump connected to the pipe, and a valve located between the pump and the deepening and near the recess and at least one through hole is made in the head for direct communication deepening with the surrounding atmosphere.

10. The device under item 9, in which the anchor is installed in the recess for movement.

11. Device according to any one of paragraphs.8-10, in which the conveyor includes a wheel which rotates relative to the first fixed Central axis, and has a connecting means between the exciting head and wheel.

12. The device according to p. 11, in which the connecting means includes a lever pivotally connected to the wheel with the possibility of fluctuations relative to wheel around the second axis, the latter is parallel to the first axis, and a gripping head pivotally connected to the lever, with the possibility of fluctuations relative to the lever around a third axis parallel to the first and second axes.

13. The device according to p. 12, in which the printhead and an electromagnet made with the possibility of fluctuations relative to the fourth axis parallel to PE

 

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