JP3342694B2 - Multicolor printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-color printing press.

[0002]

2. Description of the Related Art A plurality of printing units having a plate cylinder and a blanket cylinder opposed thereto are provided at intervals in one direction, and a sheet supported on a table movably supported in the arrangement direction of the printing units. A multi-color printing machine which supports a printing base material such as the like, moves the table in both directions of the printing unit, and performs printing on the printing substrate in each printing unit to perform multi-color printing has been conventionally known. ing.

[0003]

In the above-described multi-color printing press, a plurality of printing units are provided at intervals in the direction in which the table is moved. It is necessary to mount a printing plate on the plate cylinder of each printing unit and perform test printing, and to correct any printing misregistration.

Further, the printing units have minute manufacturing errors and assembling errors, and the mounting positions of the plurality of printing units also have minute errors, so that it is difficult to align each printing unit with the table. However, there is an inconvenience that high-precision multi-color printing without printing deviation is difficult.

[0005] Instead of the above-described multi-color printing machine having a plurality of printing units, there is also a method of performing multi-color printing by a single-color printing machine. In this case, the printing plate is replaced or registered each time printing is performed. In addition, a cleaning operation for removing the remaining ink is required, and the productivity is extremely low.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a small-sized multi-color printing machine with high productivity capable of performing high-precision multi-color printing with little printing deviation.

[0007]

In order to solve the above-mentioned problems, according to the present invention, a plate cylinder for supporting a printing plate and a plurality of images printed at equal intervals in the width direction of the printing plate are provided. A printing unit having an ink supply device for supplying a different color ink and a blanket onto which an ink image of a printing plate is transferred, a table for supporting a printing substrate printed by the printing unit, and a support table for supporting the table Having the printing unit swingably supported between a printing position where the blanket cylinder presses against the printing substrate set on the table, and a non-printing position separating from the printing substrate, A printing unit and a support table are relatively movably supported in a direction in which the table passes below a blanket cylinder of the printing unit, and the table is supported by the blanket cylinder. It employs a movably supported with the structures in a direction parallel to the axis.

In the multi-color printing press having the above-described configuration, a single wide printing plate on which a plurality of images are printed at equal intervals in the width direction is attached to the outer periphery of the plate cylinder, and each of the printing plates is provided. The ink is supplied to the image to transfer the ink image onto the blanket cylinder. Then, the printing unit and the support table supporting the table are reciprocated relatively to perform printing by contact between the printing base material supported on the table and the blanket cylinder. The operation of moving the table in a direction parallel to the axis of the blanket cylinder using the distance corresponding to the formation pitch of the formed image as a movement amount is repeatedly performed so that multicolor printing is performed on the printing substrate.

As described above, by using a single printing plate on which a plurality of images are printed, a printing displacement due to a printing plate mounting error caused at the time of multicolor printing using a single-color printing machine, a plurality of printing units, and the like. The printing error due to the accuracy error of the multi-color printing press having no printing error can be eliminated, and high-accuracy multi-color printing can be performed, and the time required for mounting the printing plate can be shortened, thereby improving productivity. Can be achieved.

[0010] Here, a dryer is provided so as to be relatively movable with respect to the support base and the table, and each time a printing base material on the table is printed by the printing unit, the drying device dries the ink image on the printing base material. By drying, the productivity can be further increased.

Further, by locking the table, it is possible to perform single-color printing. By supporting the table in a replaceable manner, it is possible to perform single-color printing with different printing widths.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2,
The multicolor printing press has a pair of left and right side frames 1, and a printing unit 2 is provided on the side frames 1.

The printing unit 2 includes the side frame 1
It has a pair of side plates 3 provided thereon, and the pair of side plates 3
The plate cylinder 4, a blanket cylinder 5 below the plate cylinder 4, and an ink supply device 6 for supplying ink to a printing plate A attached to the plate cylinder 4 are provided.

The ink supply device 6 has an ink fountain 6c formed by a fountain roller 6a and an inclined bottom plate 6b. As shown in FIGS. 4 and 5, a plurality of ink storage portions 6d are formed in the ink fountain 6c, and a partition plate 6e between adjacent ink storage portions 6d is detachable and provided above the ink storage portions 6d. It is held in the mounted state by the pressure of the leaf spring 6f.

It should be noted that a plurality of independent ink fountains may be arranged in one direction without partitioning the ink fountain 6c by the plurality of partition plates 6e.

As shown in FIGS. 1 and 2, the printing unit 2 is supported by a support piece 7 provided on the side frame 1 via a shaft 8 so as to be swingable. A printing substrate B such as a sheet printed by the printing unit 2 oscillated between a printing position where the side 3 is supported by the side frame 1 and a non-printing position displaced upward from the printing position. Is transported by the substrate transport device 10 so as to pass below the printing unit 2.

The substrate transfer device 10 has a support 11.
The support base 11 is movable along a pair of left and right linear rails 12 attached to the inner surface of the side frame 1, and is reciprocated by a moving device 13.

The moving device 13 is composed of a ball screw, a screw shaft 14 of the ball screw is provided in parallel with the linear rail 12, and a nut member 15 which is screw-engaged with the screw shaft 14 via a ball is provided on the lower surface of the support base 11. The screw shaft 14 is rotated by a motor 16 connected to the end of the screw shaft 14.

On a top surface of the support 11, a pair of linear rails 1 extending long in a direction orthogonal to the direction of movement of the support 11.
7 is attached, and a table 18 is movably supported along the linear rail 17.

The table 18 is moved by a table moving device 19. The table moving device 19 is composed of a ball screw, and a screw shaft 20 of the ball screw is provided in parallel with the linear rail 17, and a nut member 21 that is screw-engaged with the screw shaft 20 via a ball is attached to the lower surface of the table 18. The table 18 is moved by rotating the screw shaft 20 by a motor 22 connected to its end.

The printing substrate B is supported by the table 18. To support the printing base material B, a number of suction holes are formed on the upper surface of the table 18, and a suction force is applied to the suction holes to suck the printing base material B, a method of screwing, or a gripper. An additional method can be adopted.

A dryer 23 for drying the ink image of the printing base material B printed by the printing unit 2 is provided downstream of the printing unit 2 on the transfer path of the table 18 which moves together with the support table 11. ing.

Examples of the dryer 23 include a hot air dryer, an ultraviolet dryer, an infrared dryer, and an electron beam dryer. These dryers are suitable for the material of the printing substrate and the type of ink. Is used.

The multi-color printing press shown in the embodiment has the above-described structure. In multi-color printing, a single wide printing plate A is used.
The same number of images as the number of inks for multicolor printing are printed at equal intervals in the width direction. For example, when performing three-color printing, three images are printed on printing plate A at equal intervals. Printing plate A that has been baked
Is attached to the plate motion 4 of the printing unit 2.

Further, a partition plate 6e is mounted in the ink fountain 6c of the ink supply device 6 in the printing unit 2,
Three ink storage portions 6d are formed in the ink fountain 6c, and each of the ink storage portions 6d is filled with ink necessary for printing.

Further, the printing base material B is mounted on the table 18 in the base material transfer device 10.

After the preparatory work as described above, the printing unit 2 is driven, and the ink is supplied to the surface of the printing plate B attached to the outer periphery of the printing plate 4. Is moved forward to pass below the printing unit 2.

In this case, the position of the table 18 is adjusted in advance so that the printing base material B supported on the table 18 passes through one of the three ink images transferred from the printing plate A to the blanket cylinder 5. . When the support base 11 is moved forward, the printing unit 2 is held at the printing position by the operation of the cylinder 9.

For this reason, when the support 11 passes under the printing unit 2, the ink image formed on the surface of the blanket cylinder 5 due to the contact with the blanket cylinder 5 is printed on the printing base material B on the table 18. The image is transferred and printed for the first color.

In printing, the moving speed of the support table 11 is made to match the peripheral speed of the blanket cylinder 5.

When the printing substrate B on which the first color printing has been performed passes under the dryer 23, the ink image is dried.

When the printing base material B passes below the dryer 23, the support base 11 is stopped, and after the stop, the motor 16 of the moving device 13 is reversed to move the support base 11 backward.

At this time, the printing unit 2 is swung upward by the operation of the cylinder 9 to hold the printing unit 2 in the non-printing position as shown in FIG. B is prevented from contacting the blanket cylinder 5.

When the support 11 passes through the printing unit 2, the printing unit 2 is swung downward by the operation of the cylinder 9 and held at the printing position. When the support base 11 is retracted to the origin position shown in FIG. 1, the table moving device 19 is operated to move the table 18 to the linear rail 17 with a distance corresponding to the formation pitch of the image formed on the printing plate B as a moving amount. The supporting table 11 is moved forward again after the movement.

Thereafter, by repeating the above operation, multicolor printing can be performed on the printing base material B.

By holding the table moving device 19 in the locked state and reciprocating the support table 11, it is possible to perform monochrome printing.

At this time, the table 18 is
6 or a nut member 21 of a ball screw, and by replacing the table 18 with a large width dimension as shown in FIG. 6, it is possible to print a single color print having a different printing width. . In this case, the length of the ink container 6d is adjusted by adjusting the position of the partition plate 6e according to the printing width.

In the embodiment, the printing unit 2 is swingably supported at a fixed position, and the support table 11 and the table 18 are moved with respect to the fixed printing unit 2. , The support 11 and the table 18 are fixed, the printing unit 2 is moved with respect to the fixed support 11 and the table 18, and multi-color printing is performed on the printing base material B supported on the table 18. You may do so.

[0039]

As described above, according to the present invention, the printing unit and the support stand are relatively movable in the direction perpendicular to the axial direction of the plate cylinder, and the support base supports the printing base material. Movably in the direction parallel to the axis of the plate cylinder, the operation of reciprocating the printing unit and the support base relatively, and the moving pitch of the printing plate image each time the reciprocation is performed. By repeating the operation of moving the table, multicolor printing can be performed, and a very small multicolor printing machine can be obtained.

Further, since a single printing plate on which a plurality of images are printed is used, printing misregistration caused by printing plate mounting errors occurring during multicolor printing using a single color printing machine, manufacturing of a multicolor printing machine, and Printing misalignment due to an accuracy error due to assembly is eliminated, multi-color printing with high accuracy can be performed, and the time required for plate attachment can be reduced, so that productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a multicolor printing press according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view showing a state where the printing unit shown in FIG. 1 is displaced to a non-printing position.

FIG. 4 is a plan view of the ink fountain shown in FIG. 1;

FIG. 5 is a sectional view taken along line VV in FIG. 4;

FIG. 6 is a vertical sectional side view showing a state where the table of the multicolor printing press shown in FIG. 1 is replaced with a table for monochrome printing.

[Explanation of symbols]

 A printing plate 2 printing unit 4 plate motion 5 blanket cylinder 6 ink supply device 11 support base 18 table 23 dryer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B41F 7/02 B41F 17/14 B41F 31/18

Claims (3)

(57) [Claims] 1. A plate cylinder for supporting a printing plate, an ink supply device for supplying a different color ink to each of a plurality of images printed at equal intervals in a width direction of the printing plate, and an ink image of the printing plate is transferred. A printing unit having a blanket, a table for supporting a printing substrate printed by the printing unit, and a support for supporting the table,
A printing position in which the blanket cylinder presses the printing unit against a printing substrate set on a table, and swingably supported between a non-printing position separating from the printing substrate,
The printing unit and the support base are relatively movably supported in a direction in which the table passes below the blanket cylinder of the printing unit, and the table is oriented in a direction parallel to the axis of the blanket cylinder. A multi-color printing machine supported movably. 2. The multi-color printing press according to claim 1, wherein said table is exchangeably supported. 3. The multicolor printing press according to claim 1, further comprising a dryer for drying the ink image formed on the printing substrate.