JPH03286863A - Multiple printing apparatus - Google Patents

Abstract

PURPOSE:To entirely perform the registering of a printing ink layer to be laminated on a blanket cylinder under visual observation by providing the blanket cylinder having a plurality of blankets so as to provide an interval in the peripheral direction, a plurality of the plate cylinders arranged on the outer periphery of the blanket cylin der so as to provide an interval and being individually in contact with the blanket cylinder in a rotatable manner and the impression cylinder opposed to the blankets passing through a plurality of the plate cylinders. CONSTITUTION:A plurality of plate units 13a-13d are arranged on the outer periphery of a blanket cylinder 11 so as to provide an interval therebetween. The plate cylinders 14 are made adjustable in the positions thereof with respect to all of the peripheral direction (rotary direction), axial direction (shaft length direction) and twist direction (the inclined displaced direction of the axial line) thereof in order to make the registering to blankets 12 possible. In order to perform the registering of multiple printing and/or multicolor printing, the blanket cylinder 11 is rotated to successively laminate printing ink layers transferred from the plate cylinders 14 of the plate units 13a-13d on the blankets 12. At this time, by visually observing the printing ink layers laminated on the blankets 12, it is judged whether registering is proper.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiple printing device used for offset printing.

[Conventional technology and issues]

Conventionally, as a multiplex printing device for offset printing, there are
The apparatus shown in the figure is known.6 In this known apparatus, a plurality of printing units 2a, 2b, and 2c are arranged in series with respect to a strip-shaped base paper 1 that is transported by a paper feeder (not shown). Each printing unit 2 has a printing cylinder 3 and an impression cylinder 4 arranged with a base paper 1 in between, and a plate cylinder 5 is in rolling contact with the blanket cylinder 3.

An ink supply means 6 is connected to the plate cylinder 5.

Therefore, the ink layer formed on the plate of the plate cylinder 5 by the supplied ink is transferred to the blanket of the blanket cylinder 3, and then the ink layer is transferred from the blanket onto the base paper 1 to perform printing.

By the way, according to this conventionally known device, a plurality of printing units 2a, 2 are sequentially placed at predetermined locations on the transferred base paper l.
It becomes possible to perform multiplex multicolor printing using b and 2c.

However, as a result of many years of research, the inventors of the present invention have found that there is the first problem.

That is, a plurality of printing units 2a, 2b, 2c are arranged in series with respect to the transport direction of the base paper 1, and multiple printing is performed in sequence.

It is inevitable that the multiple printed ink layers will be misaligned with each other. The reason is.

Since the base paper 1 being transported is given a predetermined tension by the paper feeding device, the plurality of printing units 1-22 and 2b
This is because the base paper 1 expands between 2b and 2C (and between 2b and 2C). Furthermore, since the degree of expansion and contraction of the base paper 1 changes slightly in response to changes in humidity, it is ultimately impossible to match all ink layers that are printed multiple times completely accurately without misalignment.

Therefore, with the above-mentioned known device, it is necessary to accept even slight printing deviations, but in order to prevent printing deviations as much as possible, it is necessary to perform a test run of the device and Printing misalignment must be corrected while checking the printing status of each printing unit (2a, 2b, 2c).In particular, the registration for correcting printing misalignment must be performed on all units arranged independently of each other. printing unit) 2a,
2b and 2C (for example, the blanket of the first printing unit) 2a requires adjustment of the base paper 1
If the second ink layer printed by the blanket of the second printing unit 2b is misaligned with respect to the first ink layer printed on it, then this second printing The position of the blanket cylinder 3 of the unit 2b was finely adjusted in the circumferential direction, and after this fine adjustment, trial printing was performed on the base paper l again.

The second printing unit 2b and the third printing unit 2C must check whether the adjustment has been carried out correctly.
Registration between the two must be done in the same way.

In this way, printing registration is performed in each printing unit 2a.
, 2b, and 2c individually, it is necessary to make a test print on base paper 1 each time to check whether the adjustment for registration has been performed correctly. Registration adjustment work takes a long time, and moreover, a large amount of base paper 1 must be wasted.

Furthermore, since the intervals between the printing units 2a, 2b, and 2c are fixed within the apparatus, the intervals between the printed matter printed on the base paper l are constant, and the interval between the printed matter cannot be changed. Usually, a large margin must be left between the first printed product and the next printed product, which results in wasted base paper l corresponding to the margin. For this reason, - for boat fishing, the serial type printing device shown in Figure 3 is one
The diameter of the plate cylinder 3 and the size of the plate are set to specific values, and one plate (
Regarding the point that the size of the printing section (printing section) cannot be changed, a large diameter impression cylinder is placed in the center.

A satellite-type printing device is known in which a plurality of printing units are arranged at intervals in the circumferential direction of the impression cylinder, and in the case of this satellite-type printing device, multiple printing is performed on the base paper wound on the impression cylinder. When performing this, it is possible to change the size of the plate (printing section) in advance. However, since the plate installed on the plate cylinder has non-printing areas (margins) at both ends of a predetermined size, if the size of the 9th plate (printing area) is changed,
Since the non-printing area (margin area) must remain unchanged, the current situation is that the first plate cylinder itself must be replaced with one of a different diameter. In other words, when increasing the size of one plate (printing section), a large-diameter plate cylinder is used, and when making the plate (printing section) small, a small-diameter plate cylinder is used. I have to keep it.

Moreover, there is a problem in that these plate cylinders require replacement work.

[Means to solve the problem]

The present invention provides a multi-printing device that solves all of the above problems, and for this purpose, a blanket cylinder having a plurality of blankets spaced apart from each other in the circumferential direction; a plurality of plate cylinders that are arranged at intervals around the outer circumference of the cylinder and roll into contact with each blanket separately when the blanket cylinder rotates; an impression cylinder that faces the blanket that has passed through the plurality of plate cylinders; the impression cylinder and the blanket. It consists of a paper feeding device that feeds the base paper between the cylinders;

Furthermore, what is configured as a preferable means is as follows.

In addition to the above configuration, one paper feeding device includes an impression cylinder and a Plunke 7
a feed roller that passes between the blanket cylinders and winds a continuous sheet of paper; a drive source that rotates the feed roller; and a drive source that causes the blanket of the blanket cylinder to feed when it passes the impression cylinder It has the advantage of having a reverse rotation control means for slightly rotating the roller in the reverse direction.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail based on FIGS. 1 and 2.

In FIG. 1, a blanket cylinder 11 is provided with a plurality of blankets 12a to 12j, in the example shown in FIG. Ru.

On the outer periphery of this blanket cylinder 11, there are a plurality of plate units at one interval, and on the country side, there are four plate units 133 to 13.
d is placed. Each plate unit 13 constitutes a plate cylinder 14 that rolls into contact with each blanket 12 separately when the blanket cylinder 11 rotates. This plate cylinder 14 is provided in two directions: in the circumferential direction (rotation direction), in the axial direction (axial length direction), and in order to enable registration with respect to the blanket 12 as described later.
The position can be adjusted in any direction of twisting (direction of tilt deviation of the axis). Each plate unit 13 is equipped with an ink supply device for supplying ink to each plate cylinder i4, and the ink supply device includes an ink fountain 15,
Ink roller 16. Calling roller 17. It constitutes a kneading roller group 18. Therefore, the blanket 12 of the blanket cylinder ll rotates once.

By passing through the plate unit 13, the printing ink layer formed on the plate of each plate cylinder 14 is transferred from the plate cylinder 14 onto the blanket 12, and the plurality of plate units 132 to 13 are transferred.
By sequentially passing through steps d, printing ink layers are laminated in multiple layers on the blanket 12.

An impression cylinder 19 is disposed between the final plate unit 13d and the first plate unit 13a with respect to the direction of rotation of the blanket cylinder 11. That is, each blanket 12 on the blanket cylinder 11 faces the impression cylinder 19 after receiving the transfer of the printing ink layer from each plate unit 13 and having a multilayered printing ink layer.

A paper feeding device that feeds the base paper 20 between the impression cylinder 19 and the blanket cylinder 11 includes a first feeding roller 21 disposed below the impression cylinder 19 and a portion located continuously in the rotation direction of the impression cylinder 19. and a second feed roller 22 disposed at. These feed rollers 21, 22 are rotationally driven by one servo motor 23, 24 as a driving source, as shown in the second figure.

The base paper 1 is continuously fed out in a band shape, wound around the first feed roller 21, wound around the impression cylinder 19, then wound around the second feed roller 22, and then wound around the first feed roller 21, and then wound around the second feed roller 22, so that the base paper 1 is continuously fed out in the form of a belt. 8 that is transferred in the direction of the arrow according to the rotation of the feed rollers 21 and 22
It should be understood that the term "1" includes not only one paper but also one synthetic resin film.

Therefore, according to the apparatus of this embodiment, as described above, by rotating the blanket cylinder 11, each blanket 12 passes from the first plate unit 13a to the last plate unit 13d, thereby transferring each blanket to each plate cylinder. A total of four types or four colors of printing ink layers are transferred from 14 to form such a laminated printing ink layer on the blanket 12. Therefore, when the blanket 12 passes through the impression cylinder 19, the printing ink layer laminated on the blanket 12 is transferred onto the impression cylinder 19 onto the base paper 1 being transported by the feed rollers 21 and 22. , a printing layer 2 as shown in the second figure.
5 on base paper 1.

By the way, the blanket cylinder 11 is provided with as many blankets 122 to 12j as possible, so that the blankets 122 to 12j are adjacent to each other.

Although it is possible to make the spacing between the printing layers 25 and 25 on the base paper 1 as small as possible, that is, the spacing between the neutral portions 26 (shown in the second figure) where printing is not performed, it is possible to In order to make it smaller, it is preferable to provide a reverse rotation control means 27 for the feed rollers 21 and 22.

As illustrated in FIG. 2, when the blanket 12 of the blanket cylinder 11 passes the impression cylinder 19, the reversal control means 27 causes the servo motors 23 and 24 constituting the drive source of the feed rollers 21 and 22 to be slightly reversed. In the illustrated embodiment, the reversal control means 27 includes a sensor 28 for detecting the rotational position of the blanket 12 in the blanket f111, and inputs a signal from the sensor 28 to the human-powered boat 29a to input a signal to the human-powered boat 29a. output control signal)
The microcomputer 29 emitted from 29b and this control signal are sent to the D/
A servo mechanism is constituted by a converter 30 that performs A conversion, and a drive unit 31 that operates in response to this signal. The microcomputer 29 rotates the feed rollers 21 and 22 at a predetermined speed and a predetermined rotational distance when transfer printing the printing layer 25 from the blanket 12 onto the base paper 1, that is, during printing. When there is a detection signal from the sensor 28 that the blanket 12 has passed the impression cylinder 19, that is, immediately after printing is finished, the feed roller 21
．． Information regarding reversing 22 by a small amount is provided and stored. Therefore, the drive unit 31 rotates the servo motors 23 and 24 in the forward and reverse directions according to the information.

Therefore, as shown in the second diagram, immediately after transfer printing of the printing layer 25 is performed on the base paper 2 (12) by the blanket 12 of the blanket cylinder 11, the feed rollers 21 and 22 are reversed to move the base paper 20 backward. , the interval S between the printed layers 25 and 25 that are repeatedly printed will be narrowed to about 2 to 3 fi, and even if the above-mentioned neutral portion 26 is relatively large due to the design of the blanket cylinder 11, the printed layer It becomes possible to make the interval of 25.25 closer. Note that when the base paper 20 is retreated, the impression cylinder 19 faces the neutral portion 26 and does not sandwich the base paper 20, so the base paper 20 is not damaged due to the reversal.
At this time, the base paper 20 may be slid on the impression cylinder 19 and retreated, but the impression cylinder 19 may also be allowed to rotate freely and the impression cylinder 19 may be reversed to follow the retreat of the base paper 20.
Furthermore, a mechanism may be provided to actively drive the impression cylinder 19 in the reverse direction by an amount necessary for reversing the base paper 20.

When the feed rollers 21 and 22 rotate normally, a detection means is provided to detect the peripheral speed of the blanket cylinder 11, and the driving rotation speed of the servo motors 23 and 24 is determined based on a signal from the detection means.

It is preferable to synchronize the feeding speed of the base paper 20 transferred through the rotation of the impression cylinder 19 with the circumferential speed of the blanket cylinder 11.

[For production]

In a multiple printing device based on the above embodiment.

In order to perform multiple printing and/or multicolor printing registration, the blanket cylinder 11 is
In other words, the blanket cylinder 11 is rotated and the plate units 1 are sequentially placed on the blanket 12.
The printing ink layers transferred from the plate cylinders 14 of 3a to 13d are laminated. At this time, by visually observing the printing ink layer laminated on the blanket 12, it can be determined whether the registration is appropriate. When it is discovered that the printing ink layers stacked on the blanket 12 are misaligned with each other, the printing ink layers stacked on the blanket 12 should be checked in the circumferential direction (rotational direction) and axial direction ( axis length direction), torsional direction (axis tilt deviation direction)
, and rotate the blanket cylinder 11 again in the same manner as above to place a plurality of plate units on the plunket 12.
It is only necessary to check whether there is any misalignment in the upper and lower laminated state of the printing ink layers transferred from the plate cylinder 14 of 13a to 13d, and registration is performed by repeating this operation. All can be done on blanket 12.

Moreover, such adjustment work can be performed without supplying the base paper 20.

By the way, after such registration is completed, the base paper 20 is actually fed and printing work is performed, but in the process of being transported by the feed rollers 21 and 22, the base paper 2
Even if 0 expands or contracts.

The printing ink layer to be transfer-printed as the printing layer 25 on the base paper 2 (12) is already in the desired laminated state on the previously registered blanket 12.
The printing layer 25 is printed by transferring and printing this printing ink layer onto the base paper 2 (12) all at once on the impression cylinder 19, and the printing ink layer will no longer be misaligned.

Furthermore, the above-mentioned reversal control means 27 causes the feed rollers 21 and 22 to be slightly reversed immediately after the printing is completed,
The base paper 20 is moved back by the required amount 1, and then the feed rollers 21 and 22 are rotated forward again to print on the base paper 2 (12) from the next blanket 12.
(12) The spacing S between each printed layer 25, 25 repeatedly printed can be small compared to the dimension of the neutral portion 26 of the blanket cylinder 11. In addition, by changing the size of the plate in the first plate cylinder 14, the blanket 12
Even if the size of the upper printing ink layer changes and the distance between each printing ink layer changes in size, the feed roller 21
, 22, the printed layer 25° 2
The interval S of 5 can be set to the desired dimension.

〔Effect of the invention〕

According to the invention described in claim 1, when performing multiple printing and/or multicolor printing based on a plurality of plate units 13, the registration of the printing ink layers to be laminated is all performed using a blanket. This can be done while visually checking on the trunk 11. As a result, there is no need to perform trial printing while supplying base paper each time registration adjustment work is performed, as is the case in the past, and the base paper is not wasted and is economical. Moreover, it is registered on the blanket 12,
This is because the laminated printing ink layers, which have been laminated as desired on the blanket 12 in advance by passing through a plurality of plate units 13, are transferred and printed onto the base paper 20 all at once.

Even if the base paper 20 expands and contracts during transport,
This has the effect that printing misalignment does not occur in the laminated state of the printed layer 25.

According to the present invention as set forth in claim 2, in addition to the above effects, the interval S between the printed layers 25 and 25 repeatedly printed on the base paper 2 (12) can be set to a desired small interval. 1
This has the effect of enabling printing with close spacing.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is an enlarged front view showing a reverse rotation control means, and FIG. 3 is a front view showing a conventional example. 11... Blanket cylinder, 12 (12a ~
12j)...Plankenoh, 13 (13a
=13d)...Print unit, 14...Print cylinder, 1
9...impression cylinder, 20...base paper. 21.22...Feeding roller (paper feeding device), 2324
...Servo motor (drive fi), 25...Printing layer 2
6...Neutral portion, 27...Reverse rotation control means.

Claims (1)

[Claims] 1. A plurality of blankets (12) spaced apart in the circumferential direction
a plurality of plate cylinders (14) which are arranged at intervals around the outer periphery of the blanket cylinder (11) and roll into contact with each blanket (12) separately when the blanket cylinder (11) rotates; ) and; the plurality of plate cylinders (
The impression cylinder (1) faces the blanket (12) that has passed through the blanket (14).
9) and; a paper feeding device (21) (22) that supplies the base paper (20) between the impression cylinder (19) and the blanket cylinder (11);
) and ;. 2. The paper feeding device connects the impression cylinder (19) and the blanket cylinder (1
feeding rollers (21) and (22) that pass through the gap between the feeding rollers (21) and (22) to wind a continuous sheet of paper in the form of a belt;
) and drive sources (23) and (24) for rotationally driving the blanket cylinder (11); the blanket (12) of the blanket cylinder (11) is the impression cylinder (19);
a reversal control means (27) for causing the drive sources (23, 24) to rotate the feed rollers (21, 22) slightly in reverse when the feed rollers (21, 22) pass through;