JPH0731400B2 - Register-mark exposure device for intaglio machine - Google Patents

Description

The present invention relates to an offset printing plate for exposing and forming a register mark on a printing plate for automatic registration of the printing plate on a printing press in offset printing. A register mark exposure device for a machine.

[Conventional technology]

Generally, in order to perform multicolor offset printing, it is required that the patterns of the printing plates mounted on the plurality of plate cylinders match each other. Therefore, the register mark conventionally formed on the printing plate on the printing press is read. As a result, the patterns of the printing plates mounted on the plate cylinders are relatively matched.

Then, as a method of forming the register mark, prepare a film original plate on which the register mark is formed separately from the film original plate on which the pattern is printed, and align the register mark by the pin hole reference before or after baking the pattern. The method of baking, or the film original plate of the register mark created in the plate making process, etc. is set on the baking frame of the breeding machine before or after the original pattern is printed, and printed on the printing plate with the same machine standard as the pattern, A method of forming a register mark in an image area is known.

[Problems to be solved by the invention]

However, it is extremely difficult to match the register mark with the design by the method of printing the register mark by aligning with the pin hole standard, and the register mark film original plate is printed on the same machine standard as the design. In the case of printing on, the positional accuracy is improved, but since one register mark is required on each side of the printing plate, the number of printing surfaces is increased by two. In addition, since the pattern on the plate-making machine is generally four-sided to eight-sided, it is common to increase the number of register marks on the two-sided work, which greatly reduces the working efficiency of the plate-making machine.

[Means for solving problems]

The present invention relates to a register mark exposure device, which is supported on a plate making machine so as to be movable in a longitudinal direction and a width direction with respect to a printing plate and is attached to a side surface of an original rack for printing a film original plate on the printing plate. The mark exposure device is provided with a vertically movable casing, and an original plate having a register mark formed thereon is attached to the lower end of the casing so as to be in close contact with the printing plate when the casing descends, and a light source for irradiating the original plate with light. The casing is supported by a manuscript rack of a plate-making machine through a bracket, and the casing can be moved up and down with respect to the bracket by an elevating device. Moving up and down with respect to the bracket, the casing comprises a cooling device for cooling the light source, The guide mechanism includes a guide rail that extends vertically in the case, and a front-rear position restriction bearing and a left-right position restriction bearing that are provided in the bracket and engage with the guide rail. This is a register mark exposure device for a plate machine.

[Action]

When exposing the register mark, the casing was lowered with respect to the bracket through a guide mechanism having a front-rear position control bearing that prevents front and rear runout and a left and right position control bearing that prevents left and right runout, and was attached to the casing. The original plate is brought into close contact with the printing plate, and exposed to light for a predetermined time to form a register mark on the printing plate.
The light source in the casing is cooled by the cooling device.

(Example) Below, the Example of this invention is described based on an accompanying drawing.

FIG. 1 is an overall perspective view of an automatic plate making machine applied to a register mark exposure apparatus according to the present invention. The automatic plate making machine comprises a plate making machine 1 and a plate making machine controller 2, A table 8 is provided on the base 3 so as to be movable in the longitudinal direction of the base 3, and a printing plate 9 is fixed on the table 8. Frames F, F are attached to the base 3 on the base 3, and a document rack 4 is supported on the frame F so as to be movable in the width direction of the base 3. A film original plate 6 is held by a baking frame 5 on the bottom surface of the document rack 4, and a register mark exposure device 7 according to the present invention is provided on one side of the document rack 4. Here, the document rack 4 and the table 8 are moved by a feeding mechanism (not shown).

On the other hand, an input unit 10 is provided in the plate-making machine control device 2, and a magnetic card or the like in which the original printing position and the exposure position are recorded is input to the input unit 10 so that the printing plate 9 is fixed on the table 8. The pattern and register mark are printed.

It should be noted that as the breeding machine 1, the document rack 4 may be moved left and right or front and back, or the table 8 may be moved left and right and back and forth, and in addition to magnetic cards, known punch cards, magnetic cassettes, and the like may be used. A storage medium may be used.

2 is an overall perspective view of the register mark exposure device 7, and FIG. 3 is a fragmentary front view of the main part as viewed from the direction A in FIG.
In the register mark exposure device 7, a case 12 is vertically movably mounted on a bracket 11 fixed to the document rack 4. That is, guide rails 13 and 13 are provided on both sides of the case 12,
Front and rear position regulating bearings 14 ... 14 and left and right position regulating bearings mounted on the bracket 11 on the guide rails 13, 13.
The guide rails 13 and the bearings 14 and 15 form a guide mechanism by abutting against each other. Further bracket 11
Cylinder unit 16 as an elevating device is fixed to one side of the cylinder unit, the operating plate 18 is attached to the rod 17 of the cylinder unit 16, the upper end of the case 12 is attached to the operating plate 18, and the cylinder unit 16 is operated. In this case, the case 12 can be smoothly moved up and down by the bearings 14 and 15 without swinging back and forth and left and right. Here, a spring 19 is provided on the outer circumference of the rod 17 of the cylinder unit 16 and urges the rod 17 upward so that the rod 17 does not descend even when the cylinder unit 16 is OFF.

Further, a glass dry plate 20 as an original plate on which a register mark is formed is attached to the bottom surface of the case 12. A register mark is formed on the lower surface of the glass dry plate 20, that is, on the side contacting the printing plate so that a clear register mark can be formed on the printing plate 9. And glass plate 20
A light source 22 for exposure is mounted in a case 12 above the socket via a socket 21, and the socket 21 is connected to an electric connector 23 mounted on the upper part of the case 12 via a cord.

A cooling air blowing member 24 is provided above the light source 22, and the cooling air blowing member 24 is connected to an air joint 25 attached to the upper part of the case 12 via a pipe. Thus, the cooling air blowing member 24 is connected via the air joint 25.
The cooling air pumped to the air source blows out toward the light source 22,
The outlet formed on the lower side of the case 12 after cooling the 22
It is discharged from 26 to the outside.

FIG. 4 is a block diagram showing a control system of the register mark exposure device 7 of the plate-making machine control device 2 (a part relating only to the operation of the plate-making machine is omitted). The I / O port 30 is added to the original control system for controlling the operation of the breeding machine 1 itself, and a program for controlling the I / O port 30 is added to the ROM 31. And I / O
The drive circuit of the light source 22 via the timer 32 to the port 30
33 is connected, and the light source 22 is turned on for the time set by the timer 32 by the signal output from the CPU 34 to the I / O port 30. Further, a solenoid valve 35 is connected to the I / O port 30 to perform ON / OFF operation of a path for supplying air to the air cylinder unit 16 from the compressor 36 built in the breeding machine 1.

Next, the operation of the register mark exposure device 7 will be described.

First, a film original plate 6 having a pattern is set on the original rack 4, and a magnetic plate is inserted into the input unit 10 of the control device 2 with the printing plate 9 fixed to the table 8. On this magnetic card, the printing data such as the original printing position and the exposure position data of the register mark are recorded by the data creating device.

Then, the input data is recorded in the RAM 37 via the CPU 34, is called by the program of the ROM 31, and the pattern is printed in the order of the data.

Here, when the exposure position data of the register mark is called, the position control of the document rack 4 is performed in the same manner as the plate data, and instead of the control of contact and exposure of the film master 6 in the document rack 4, the register The cylinder unit 16 of the mark exposure device 7 is driven, and the ON / OFF control of the light source 22 is performed.

That is, in order to expose the register mark at the designated position on the printing plate 9, first, the table 8 is moved in the longitudinal direction of the front-rear direction base 3 and the document rack 4 is moved in the width direction of the base 3 for position control. Is done. When the register mark exposure device 7 is positioned at the designated position in this way, a signal is output from the CPU 34 to the I / O port 30 and the solenoid valve 35
Is turned on, air is supplied to the cylinder unit 16,
The case 12 descends together with the rod 17.

Then, the case 12 descends and the operation of the cylinder unit 16 is stopped when the glass dry plate 20 provided on the bottom surface of the case 12 contacts the upper surface of the printing plate 9.

Next, a signal is output again from the CPU 34 to the I / O port 30, the light source 22 is turned on for the time set by the timer 32, and the register mark is exposed. When exposure is complete, solenoid valve 35 turns OF
F, the rod 17 of the cylinder unit 16 is spring 1
The elastic force of 9 rises and the glass plate 20 separates from the printing plate 9.

By repeating the above-mentioned operations, a printing plate 9 having a plurality of patterns 40 ... 40 and register marks 41 ... 41 is obtained as shown in FIG. Register mark here
The exposure time of 41 is about 4 to 10 seconds, and the optimum exposure time is set by manually operating the timer 32 according to the concentration control state of the developing solution in the printing plate developing machine. The exposure of the register mark may be performed at the same time as the exposure of the pattern or before or after the exposure of the pattern.

By the way, the register mark 41 formed on the glass plate 20
When the printing plate 9 is a positive type (the part exposed to light becomes a non-image area), the mark part is a positive type that blocks light, as shown in FIG. When 9 is a negative type (the part exposed to light becomes the image area), the mark part is a negative type that allows light to pass through, as shown in FIG. 6 (b).

Further, as the original plate on which the register mark is formed, a film may be used in addition to the glass dry plate, and when a negative type printing plate is used, it may be a metal plate or a resin plate having a hole copying the shape of the register mark. Good.

Further, the light source 22 may be a tungsten lamp in addition to the halogen lamp, and the cylinder unit 16 for vertically moving the case 12 may be a hydraulic type.

FIGS. 7 and 8 are views showing another embodiment. In the embodiment shown in FIG. 7, two register mark exposure devices 7, 7 are attached to one side of the document rack 4. With such a configuration, the register mark can be accurately exposed at the designated position even in the intaglio machine in which the range of movement of the document rack 4 is small.

Further, in the embodiment shown in FIG. 8, a plurality of light sources 22 and glass dry plates 20 are provided in one case 12,
Even with such a configuration, it is possible to cover the original rack 4 even if the moving range thereof is small, as in the above case.

The shape of the register mark 41 is not limited to the shape where the horizontal line and the inclined line intersect at one point as shown in FIG. 6, but the horizontal line and the inclined line are separated, the triangle having the horizontal side and the inclined side, Various shapes such as letter shapes, horizontal lines only or vertical lines only are conceivable.

Next, a positioning method using a register mark when setting the printing plate on the plate cylinder of the printing machine will be described with reference to FIG.

That is, an optical sensor that reads the register mark 41 of the printing plate 9 wound around the plate cylinder 42 and separated from the plate cylinder 42 of the printing machine.
50 is provided, and the reference point setting unit 51 is provided on the rotary shaft 42a of the plate cylinder 42.
The reference point setting unit 51 includes a setting ring 52 formed on the rotary shaft 42a, and a sensor 53 that detects when the setting ring 52 reaches a preset reference position. This sensor 53 is connected to a reference point signal generator 63.

The front, rear, left and right optical sensors 50, 50 determine the distance between the reference point S set by the reference point setting unit 51, the horizontal thin line 54 of the register mark 41, and the inclined thin line 55 forming an angle θ with the horizontal thin line 54. When the registration is correct, the distances from the reference point S of each mark on each plate cylinder to each fine line 54, 55 are equal. This state is shown in FIG.

Further, among some plate cylinder and the other of the plate cylinder, with respect to the distance from the reference point S as shown in Figure 10 (b), only in the vertical direction epsilon ₁
If only the error is detected, the signal is input to the vertical direction error amount detection circuit 57 via the mark detection circuits 56, 56, and the plate cylinder phase correction motor drive circuit 58 is output by the output signal from the circuit 57. In operation, the rotational phase of each plate cylinder is matched by known means.

Also, the left and right register marks 41, 41 on a plate cylinder are the first
As shown in FIG. 0 (C), when the vertical displacement is equal to the horizontal direction, the vertical displacement ε ₁ is corrected as described above, and the horizontal displacement ε ₂ (=
l ₂ ″ −l ₂ ′ = l ₂ ″ −l ₂ −ε ₁ = l ₃ tan (90−θ)) is detected by the left / right direction error amount detection circuit 59, and this detection signal is detected by the left / right direction plate cylinder drive circuit. It is input to 60 and the plate cylinder itself is moved and corrected in the left-right direction by a known means.

Further, in one plate cylinder, when one of the left and right register marks 41 is in the standard state shown in FIG. 10 (a) and the other is in the state shown in FIG. 10 (C), that is, the plate cylinder has left and right standard points. When the distance between S and the horizontal fine line 54 is different, it means that the plate cylinder 42 is attached in a state in which the printing plate 9 is twisted. Therefore, the twist error (ε ₁ + ε ₂ on the right side)-(on the left side ε ₁
+ Ε ₂ ) is detected by the twist amount detection circuit 61, and the signal from this detection circuit 61 is input to the twist correction motor drive circuit 62.

The twist correction is performed by a known cocking device 70 as shown in FIG. That is, the operation side of the plate cylinder 42 is movable back and forth with respect to the drive side (gear side), and this movement is performed by the rotary bearing 71 mounted eccentrically upward on the rotary shaft 42a of the plate cylinder. It is performed by being slightly rotated by the drive shaft 72 which is rotated by. The rotating bearing
A threaded portion 71a is formed in the lower portion of 71, and this threaded portion 71a meshes with the threaded portion 72a of the drive shaft 72, and the rotation of the drive shaft 72 causes the rotation bearing 71 to rotate about its center O as an axis. Plate cylinder 42
Will move slightly to the left and right in the figure. This correction is not preferable in terms of mechanical structure because the contact between the plate cylinder and blanket cylinder is misaligned, so the correction amount is usually kept within ± 0.3 mm.

Then, after the plate cylinder is once corrected, the register mark 41 is further read, and if the correction amount is inappropriate, a correction signal is issued again, and feedback control is performed in this manner.

As described above, after the printing plate is mounted, the plate cylinder is idled without printing to perform registration.

〔The invention's effect〕

As described above, according to the present invention, since the register mark exposing device is attached to the original rack of the plate-making machine, it is possible to print the register mark with the same device at the same time as or before and after printing the pattern, The misalignment of the relative positions of the pattern and the register mark printed on the printing plate of the number corresponding to each color is eliminated, and accurate registration is possible. When the register mark is exposed, the casing is lowered with respect to the bracket via the guide mechanism, so that the original plate provided at the lower end of the casing can be accurately positioned on the upper surface of the printing plate. Further, since the light source in the casing is cooled by the cooling device, the temperature of the light source can be prevented from rising, which can prevent thermal deformation of the casing and internal parts. Further, it is possible to prevent thermal deformation of the document rack, which enables accurate printing.

Further, compared to the means for attaching the register mark original plate to the baking frame and baking it in the same manner as a general pattern, the device according to the present invention not only requires a small number of printing surfaces but also the register mark original plate on the baking frame. Since it is not necessary to vacuum-adsorb it, the register mark can be efficiently printed and many other effects can be obtained.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an automatic engraving machine to which the register mark exposure device according to the present invention is applied, FIG. 2 is a perspective view of the register mark exposure device, and FIG. 3 is a view seen from the direction A in FIG. Partial front view, FIG. 4 is a control block diagram of a register mark exposure apparatus, FIG. 5 is a plan view of a printing plate, FIG. 6 (a) is a plan view of a positive type glass plate, and FIG. 6 (b) is FIG. 7 is a plan view of a negative type glass dry plate, FIG. 7 is a perspective view of a document rack showing another embodiment, FIG. 8 is a vertical sectional view of a register mark exposing device according to another embodiment, and FIG. FIG. 10 is a configuration diagram of the apparatus, FIGS. 10 (a), (b) and (c) are explanatory views of a correction method for registering, and FIG. 11 is a perspective view of the cocking apparatus. 1 ... Reproduction machine, 2 ... Reproduction machine control device, 4 ... Manuscript rack,
6 ... Original film, 7 ... Register mark exposure device, 9 ... Printing plate, 11 ... Bracket, 12 ... Case,
13 …… Guide rail, 14,15 …… Bearing, 16 …… Cylinder unit, 20 …… Glass dry plate, 22 …… Light source, 41…
… Register mark, 42… plate cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Fujii 20-20, Uji Hanbaku, Uji-shi, Kyoto 35 (72) Inventor Keiichi Noda 8 96, Fukakusa-Nishiura-cho, Fushimi-ku, Kyoto-shi, Kyoto (56) References 59-28160 (JP, A) JP-A 47-6204 (JP, A) JP-A 51-14404 (JP, A) JP-A 49-56703 (JP, A) JP-A 59-135472 (JP , A) JP 60-61754 (JP, A) JP 58-224755 (JP, A) Actually opened 50-11601 (JP, U) Actually opened 52-142401 (JP, U)

Claims (2)

[Claims] 1. A register mark exposure device, which is movably supported on a printing plate in a longitudinal direction and a width direction with respect to a printing plate and is attached to a side surface of an original rack for printing a film original plate on the printing plate. The register mark exposure device is provided with a vertically movable casing, and at the lower end of this casing is attached an original plate having a register mark formed thereon, which is intimately adhered to the printing plate and printed when the casing descends, and the original plate is irradiated with light. A light source is provided, the casing is supported via a bracket on a document rack of a plate-making machine, and the casing is moved vertically with respect to the bracket by an elevating device.
The casing moves up and down with respect to the bracket through a guide mechanism that prevents left and right runout, the casing includes a cooling device for cooling the light source, and the guide mechanism is a guide rail that extends vertically in the case. A register mark exposure device for an intaglio machine, comprising: a front-rear position restriction bearing and a left-right position restriction bearing which are provided on the bracket and engage with the guide rail. 2. The two original plates and the two light sources are provided in the casing, and two of them are provided in the casing.
A register mark exposure device for a plate-making machine according to the item.