JPH06143540A - Multicolor printer - Google Patents

Abstract

PURPOSE:To provide a multicolor printer which can print multiple colors without delivery such as transfer of a gripper, etc., and print even on a thick sheet having a strong nerve. CONSTITUTION:Printing units 90a-90d have inking units 25, plate cylinders 21, blanket cylinders 20, impression cylinders 22, etc., drive means for engaging an endless stripe such as a chain, etc., with the cylinders 22,..., of the plurality of the units 90a-90d and driving the stripe, and a holder 32 for holding a matter 16 to be printed on the stripe to pass it between the cylinders 20 and 22 of the units 90a-90d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor printing machine capable of performing multicolor printing without delivering a printing material.

[0002]

2. Description of the Related Art Conventionally, as a multi-color printing machine, as shown in FIG. 6, a plurality of printing units 9 ... Arranged in series is known. The printing paper 4 is passed between the blanket cylinder 2 and the impression cylinder 3 of each printing unit 9 for printing. A gripper (not shown) provided in a concave portion formed on the outer peripheral surface of the impression cylinder 3 constituting the printing unit 9 holds the leading end of the printing paper 4 supplied from the supply device 4a, and the blanket cylinder 2 and It is passed between the impression cylinder 3. In addition, it is transferred to the blanket cylinder 2 through the plate cylinder 6 inked by the inking device 5,
Printing is performed on the printing paper 4 from the blanket cylinder 2. The inking device 5 is not shown in the second and third printing units 9 and 9 and is omitted. Further, the printing paper 4 supplied and printed between the blanket cylinder 2 and the impression cylinder 3 is transported while being held by the gripper and attached to the outer peripheral surface of the impression cylinder 3. The printing paper 4 is sent in a state in which it is attached to the semi-circumferential surface of the impression cylinder 3, and is then gripped by a gripper (not shown) of the delivery cylinder 7, and the printing paper 4 is bent in the opposite direction and sent. To be From the delivery cylinder 7, the gripper of the impression cylinder 3 which constitutes the second printing unit 9 changes the grip, and the printing paper 4 is bent in the opposite direction and sent to perform printing. Thereafter, in the same manner, the printing paper 4 is sent to the second to third printing units 9 and 9 and to the third to fourth printing units 9 and 9, respectively, and printed. After printing by the fourth printing unit 9, the printing paper 4 is bent in the opposite direction and discharged by being gripped by the gripper 8c provided on the chain 8b stretched from the impression cylinder 3 to the delivery sprocket 8a. It The print paper 4 held in the gripper 8c is conveyed to the paper discharge position, and the gripper 8c is opened at the paper discharge position to discharge the print paper 4. The gripper changes the gripping of the printing paper 4 at seven points a to g, but the six points a to f have an influence on the accuracy of printing misalignment.

[0003]

However, the above-mentioned multicolor printing machine has the following problems. First, in the above-mentioned multicolor printing machine, since the gripping change of the printing paper 4 is carried out at six positions a to e, an error may occur during the gripping change, which also causes a color shift. In addition, since the printing surface of the printing paper 4 moves in contact with the delivery cylinder 7, the printing surface may be rubbed and rubbing marks may remain. On the other hand, in the above-described multicolor printing machine, when the printing paper 4 is transferred, the printing paper 4 is transferred by the impression cylinder 3 and the transfer cylinder 7 in a state as if it were bent into an S shape, and by the time printing is completed. It had to be bent back so many times that it was impossible to print on thick paper. That is, the printing paper 4, which is a thick board such as a synthetic resin plate or a cardboard, having a strong rigidity, cannot be conveyed after printing, and cannot be printed in reality. It is possible to increase the diameter of the impression cylinder 3, but this is impossible due to the structure of a small printing machine. Therefore, the present invention provides a multicolor printing machine capable of performing printing without handing over a material to be printed, such as gripping the multicolor printing, and printing even thick stiff paper. To aim.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, a plurality of printing units, which print by passing a material to be printed between the blanket cylinder to which the transfer pattern is transferred via the plate cylinder inked by the inking device and the impression cylinder, are arranged in series. In a color printing machine, an endless strip such as a chain is laid over each impression cylinder of the printing unit, and a driving means for driving the endless strip is provided, and a printing material is held on the endless strip to hold a substrate to be printed. It is characterized in that a holding tool is provided for passing between the blanket cylinder and the impression cylinder. In addition, a sprocket that changes the direction of the endless strip may be arranged ahead of the impression cylinder of the earliest printing unit and before the position where printing of the printing material held by the holder ends. The holding tool may be a gripper for holding a material to be printed, and the impression cylinder may be provided with a recess for accommodating the gripper.

[0005]

[Operation] The operation will be described. An object to be printed is held by a holder provided on a pair of endless strips, and while the object to be printed is held by the holder, printing is performed by passing between the blanket cylinder and the impression cylinder of each printing unit. Therefore, it is not necessary to deliver the printed material, and the printed material is not bent so as to be folded back.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an explanatory view showing a schematic mechanism of a multicolor printing machine according to the present invention. FIG. 2 is an explanatory view showing a transfer mechanism of the printing paper. In the multicolor printing machine 10, the printing mechanism 16 supplies stocked printing paper 16 for printing.
2 to the paper feed conveyor 14, and the paper feed conveyor 14 supplies the printing unit. Behind the supply conveyor 14, four printing units 90a, 90
b, 90c, and 90d are arranged in series. Each printing unit 90a, 90b, 90c, 90d is first
~ 4th. The printing units 90a to 90c are
Although they have the same structure, they are printed in different colors.

The supply conveyor 14 supplies the printing paper 16 to just before the blanket cylinder 20 and the impression cylinder 22 which form the first printing unit 90a. Blanket body 2
Immediately before 0 and the impression cylinder 22, a feed roller 24 and a feed roller 26 are arranged following the paper feed conveyor 14. A feed roller 26 with respect to the feed roller 24
Can be separated. A front pad 33 is arranged in front of the feed roller 26 and the feed roller 24. The printing paper 16 is temporarily brought into contact with the front pad 33 in a state where the feed roller 26 and the feed roller 24 are separated from each other and stopped. By temporarily stopping the printing paper 16 with the front pad 33, the timing of supplying the printing paper 16 to the preceding blanket cylinder 20 and the impression cylinder 22 is adjusted. The printing paper 16 is ready to be supplied by rotating the front pad 33 that regulates the printing paper 16 once, for example, coaxially with the feed roller 24.

An image to be printed is transferred from the plate cylinder 21 inked by the inking device 25 to the blanket cylinder 20. This blanket cylinder 20 and impression cylinder 22
Printing is performed on the printing paper 16 by passing the printing paper 16 between and.

Printing units 90b, 90c and 90d having the same structure as the above-mentioned first printing unit 90a are arranged in series. Then, a pair of delivery sprockets 28, 28 is provided ahead of the impression cylinder 22 of the fourth printing unit 90d.
Are arranged. Delivery sprockets 28, 28,
Chains 30, 30 as endless strips are stretched between both ends of the impression cylinder 22 of the first printing unit 90a. In addition, the second to fourth printing units 90b, 90
The chain 30, also at both ends of the impression cylinders 22 ...
Thirty have been passed over. This pair of chains 30, 3
A plurality of grippers 32 for gripping the leading edge of the printing paper 16 are provided on the 0 at equal intervals. The delivery sprockets 28, 28 are the fourth printing unit 90.
It is preferable that the blanket cylinder 20 and the impression cylinder 22 of d are positioned before the position where the printing of the printing paper 16 is completed. Further, widthwise recesses 22a for accommodating the grippers 32 are formed on the outer peripheral surface of each impression cylinder 22 of each of the first to fourth printing units 90a to 90c. The gripper 32 moves along with the driving of the chains 30 and 30, and at the position of the impression cylinder 22, the recess 2 formed on the circumferential surface of the impression cylinder 22.
It is stored in 2a.

Here, regarding the structure of the gripper 32,
Further description will be made with reference to FIGS. The gripper holder 30a, the gripper holder 30a,
30a is fixed. This gripper holder 30
Both ends of a plate-shaped claw stand 34 are fixed between a and 30a. A plurality of claws 3 are provided on the upper edge of the claw base 34.
4a is protruding. Further, the nail holders 35, 35 extend from both ends of the nail holder 34, and the nail holders 35, 35
Bearings 35a, 35a are provided at the tip of the. A pawl shaft 36 is attached to the bearings 35a, 35a. An operating arm 38 is integrally fitted to one end of the pawl shaft 36, and a cam roller 39 is axially fixed to the tip of the operating arm 38. A claw holder 40 is fixed on the claw shaft 36 at a position corresponding to the claw portion 34a of the claw base 34, and a claw piece 41 is fixed to the tip of the claw holder 40. The claws 42 a that grip the printing paper 16 by the claw portions 34 a of the claw base 34 and the claw pieces 41 of the claw holder 40.
Are configured. The claw shaft 36 includes the claw portions 34a ...
On the other hand, the elastic members (not shown) are urged in the direction in which the tips of the claw pieces 41 ... Abut. Therefore, when the operating arm 38 is rotated against the biasing force of the elastic member, the pawl shaft 3
6, the claw holder 40 and the claw piece 41 rotate,
The claw 42 opens.

The opening / closing operation of the claw 42 will be described with reference to FIG. In FIG. 2, the first printing unit 90
a Chains 30 and 30 hung between both ends of the impression cylinder 22 and the delivery sprockets 28 and 28 are shown.
The impression cylinders 22 ... Of the second to fourth printing units 90b to 90d located in the middle of the chains 30 are omitted. The recess 22 of the impression cylinder 22 of the first printing unit 90a
An impression cylinder cam 44 for abutting the cam roller 39 at the tip of the operating arm 38 is positioned and fixed in a. Further, the transfer cam 4 for opening the claw 42 of the gripper 32 is coaxial with the transfer sprockets 28, 28 and at a position corresponding to the cam roller 39 of the gripper 32.
6 is fixedly provided. Further, the grippers 32 holding the printing paper 16 in the recesses formed in the impression cylinders 22 of the second to fourth printing units 90b to 90c.
Are only sequentially stored, and the claws 42 of the gripper 32 are not opened or closed.

By driving the chains 30 and 30, the grippers 32 ... Move with the chains 30 and 30. When the gripper 32 moves into the recess 22a of the impression cylinder 22 of the first printing unit 90a, the cam roller 39 at the tip of the operating arm 38 contacts the impression cylinder cam 44 and moves with the rotation of the impression cylinder 22. Then, when the cam roller 39 at the tip of the operation arm 38 moves along the convex portion 44A of the impression cylinder cam 44, the pawl shaft 36 rotates in the counter hour hand direction and the pawl 42 gradually opens. Further, when the cam roller 39 moves on the top of the convex portion 44A, the claw 42 is in the open state.
When the cam roller 39 is further moved, the cam roller 39 is moved along the convex portion 44A and the pawl 42 is closed. The timing at which the printing paper 16 is supplied is when the claw 42 is opened (when the cam roller 39 moves on the top of the convex portion 44A).

The printing paper 16 whose leading edge is held by the gripper 32 housed in the impression cylinder 22 of the first printing unit 90a is pulled forward in a horizontal state by the driving of the chains 30 and 30, and thus the blanket cylinder. Two
Printed by 0. Subsequently, the printing paper 16 is pulled in the horizontal direction by driving the chains 30 and 30.
Passes between the blanket cylinder 20 and the impression cylinder 22 of the second to fourth printing units 90b to 90d and is printed in different colors. When the gripper 32 is moved to the delivery sprocket 28, 28 position, the gripper 32 is moved by the convex portion 46A of the transfer cam 46.
Opens, and the printing paper 16 is delivered to the paper discharge device 49.

Immediately above the delivery sprockets 28, 28 is a pair of receiving sprockets 5 constituting a paper discharge device 49.
0 and 50 are arranged. Also, receive sprocket 5
A pair of exhaust sprockets 52, 52 is also arranged in front of 0, 50. These receiving sprockets 50,
Chains 54, 54, which are endless strips, are stretched around 50 and the discharge sprocket 52, 52. The chains 54, 54 are also provided with a paper discharge gripper 56 having the same structure as the gripper 32. Chain 30,
A printing paper 16 which has a leading edge held by a gripper 32 on 30 and is printed by a blanket cylinder 20 ...
Is sent to the other side, and when it is positioned directly below the receiving sprockets 50, 50, the paper discharge gripper 56 on the chains 54, 54 also moves to the same position, and the gripper 32 grips the paper discharge gripper 56 and carries it. To do. The positions of the claws of the gripper 32 and the paper discharge gripper 56 are shifted in the parallel direction of the claws so that the grippers can be replaced.

When the gripper 56 holding the printing paper 16 moves to the discharge sprocket 52, 52 position, the gripper 56 opens to drop the printing paper 16 (paper discharge position). In addition, the leading end side of the discharge position (the discharge sprocket 5
A discharge stopper 58 is provided in the vicinity of 6, 56),
The leading edge of the falling printing paper 16 is aligned. Further, a paper discharge alignment 60 is provided at the rear end portion of the paper discharge position.

The multicolor printing machine is constructed as described above, and the printing paper 16 having its leading edge gripped by a plurality of grippers 32, ... .. can be moved without bending the printing paper 16 because the printing paper 16 is pulled forward in the horizontal state and printed by the printing units 90a to 90d. In the above embodiment, each printing unit 9
Timing of printing at 0a to 90d and printing paper 16
.. The timing of transferring and passing is controlled by the control device. Further, the blanket cylinders 20 ... Of the printing units 90a to 90d are respectively driven, and the impression cylinders 22 ... that mesh with the blanket cylinders 20 ... Are also driven, so that the chains 30 and 30 are The rotation of the impression cylinders 22 ... Is driven as driving means. In addition, chain 3
Separate drive means may be provided as the drive means for 0 and 30.

In the above embodiment, a plurality of grippers 32.
.. The printing paper 16 as the object to be printed is gripped by the.
A tray-shaped holder capable of accommodating and holding a plate-shaped body may be provided on the zero. In this way, it is possible to print a small object, a block-shaped object, a thick object, etc. without requiring a gripping margin of the printing object. For example, it is possible to store a compact disc or the like in the holder and perform multicolor printing. By using such a holder, it is possible to realize multicolor printing without transferring the material to be printed on the way. In addition, the holder is used for each impression cylinder 22.
It may be provided on a belt as an endless strip that is wound around. Furthermore, an endless strip may be stretched over a sprocket arranged in front of the impression cylinder 22 of the first printing unit 90a, and the material to be printed may be appropriately supplied to the holder by the supply means. Although various descriptions have been given with reference to the preferred embodiments of the present invention, the present invention is not limited to the above embodiments, and many modifications can be made without departing from the spirit of the invention. .

[0018]

Since the multicolor printing machine according to the present invention can realize multicolor printing without delivering the printing material, an error occurs when gripping the printing material like the conventional multicolor printing machine. There is no color shift. Further, unlike the conventional multicolor printing machine, the printing surface of the printing material does not come into contact with the roller or the like, and rubbing marks are not left on the printing surface. Further, when the printed material is transferred, the printed material is not bent into an S-shape unlike the conventional multicolor printing machine, so that the printed material can be printed and discharged in a horizontal state, and is made of synthetic resin. It has a remarkable effect of being able to print a strong cardboard such as a board or a cardboard.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing the structure of a multicolor printing machine according to the present invention.

FIG. 2 is an explanatory view showing a printing paper transfer mechanism of the multicolor printing machine according to the present invention.

FIG. 3 is a partial cross-sectional side view of a gripper.

FIG. 4 is a side view of a nail holder and a nail holder.

FIG. 5 is an operating arm having a cam roller on a pawl shaft;
It is a cross-sectional side view which shows the state which fixed the nail holder which fixed the nail piece integrally.

FIG. 6 is a side view of a conventional multicolor printing machine.

[Explanation of symbols]

 10 multi-color printing machine 12 feeding mechanism 14 paper feed conveyor 20 blanket cylinder 22 impression cylinder 24 feed roller 26 feed roller 30 chain 32 gripper 56 paper discharge gripper 90a, 90b, 90c, 90d printing unit

Claims (3)

[Claims] 1. A plurality of printing units for printing by passing an object to be printed between a blanket cylinder to which a transfer pattern has been transferred via a plate cylinder inked by an inking device and an impression cylinder are connected in series. In the arranged multicolor printing machine, an endless strip such as a chain is hung over each impression cylinder of the printing unit, and a drive means for driving the endless strip is provided, and the printing medium is held on the endless strip by holding each printing object. A multicolor printing machine, comprising a holding tool that passes between a blanket cylinder and an impression cylinder of a printing unit. 2. A sprocket for diverting the direction of the endless strip is arranged ahead of the impression cylinder of the earliest printing unit and before the position where the printing of the material to be printed held by the holder is completed. The multicolor printing machine according to claim 1. 3. The multicolor printing machine according to claim 1, wherein the holder is a gripper for gripping a material to be printed, and the impression cylinder is provided with a concave portion for accommodating the gripper.