JPS6061754A - Register mark forming device - Google Patents

Abstract

PURPOSE:To improve an accuracy of an aim mark, and to detect easily the aim mark by providing a means for cutting off a light of a wavelength band to which a photosensitive layer of a printing edition reacts, and also forming the aim mark on the surface of the printing edition by a substance whose reflecting density is different from a color of an Al ground of the printing edition, on a drawing head. CONSTITUTION:A drawing heat 5 which can move freely on a drawing plate 1 is provided, a drawing means for forming a dragonfly mark 52 for a film negative contact printing to the surface of a printing edition is provided on this drawing head 5, and also a register mark for transferring a substance for cutting off a light of a wavelength band to which a photosensitive layer of a printing edition P reacts, being different in its reflecting density from an Al ground of the printing edition P and assuming a color which can be discriminated clearly by an optical sensor is formed on the construction head 5. That is to say, the drawing heat 5 is constituted so as to be freely movable on the drawing plate 1, and the movement and stop of such a drawing head 5 are controlled by a computer. In this way, drawing of the dragonfly mark 52 for positioning at the time of a film negative contact printing, and an aim mark 53 which can maintain a distinct picture even after passing through the developing and fixing processes can be formed on the surface of the fixed printing edition by one drawing head 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for drawing register marks on a printing plate having 11 hairs such as registration marks and register marks on the surface of the printing plate used in the lithographic printing method.

Recently, in order to shorten work time and improve work efficiency in plate making and printing processes, registration marks are used for positioning when printing a film plate in close contact with the surface of an unexposed printing plate, which was previously done manually. A system has been developed and put into practical use that automatically draws marks by controlling the convoter to form marks.

This system draws registration marks on the pin holes that are formed on the printing plate, and in multicolor printing, there is no dimensional error in the registration mark drawing position between IJI plates of each color by /: 1'. It can be said that it is a superior system.

Furthermore, for the same purpose, a mark (011 plate) is formed by a register mark on the surface of the plate, this mark (61 plate plate) is defeated by the plate cylinder of a printing press, and an optical sensor installed in the printing press is used to mark f1il1. Detects marking marks on the surface of the plate.

Based on this detection signal, a system has been developed that automatically adjusts the printing plates in each color printing unit to a state where there is no misregistration, thereby reducing the printing preparation time and making it possible to use five printing plates.

The register marks on the printed version in the latter system are.

The formation position is fixed at a fixed position on each color printing plate, and the relative position with the register mark for "contact printing of the film original plate" is also not constant.
In order to facilitate detection by an optical sensor on a printing press, the light reflection characteristics of the register mark and its surroundings must be clearly differentiated.

However, regarding the formation of register marks by conventionally known systems, the positional accuracy is
Although there are many ways to do this, it is difficult to detect register marks using an optical sensor because they are based on markings, and the reality is that a considerable amount of ingenuity is required.

Register mark mark M' on the surface of the printing plate, 11 + q)
Detectability lma, mark) 311 version registration-C
If it is difficult to detect the register mark, it will take a long time to register, and the equipment configuration for detecting the register mark will be expensive and time-consuming, and the registration accuracy will be poor. Poor 1: You will end up in an unfavorable situation such as doing something.

Therefore, the object of the present invention is to be able to form not only registration marks for close contact printing of a film original plate on the surface of a printing plate, but also registration marks for registration during printing (flaming), and to be able to form registration marks with high accuracy as a post-process. The purpose of the present invention is to provide an apparatus for forming register marks such as printing of register marks (which can form register marks that facilitate the register mark detection process).

The present invention, which was made to achieve this object, has a movable drawing head on which a printing plate is placed and which is placed on a filter drawing board, and the drawing head is used to print a film original in close contact with the surface of the printing plate. 7) Providing a drawing means to form a registration mark on the printing head, and furthermore, providing at least a mark on the drawing head to block light in the wavelength range in which the ℃ layer reacts and reflect density with the aluminum substrate of the printing plate. This apparatus is characterized in that it is provided with register mark forming means that is transferred to the surface of the stamp plate and exhibits a color that can be clearly distinguished by an optical sensor.

The following is a detailed explanation of the invention based on the embodiments of the drawings.
reactor.

FIG. 1 shows a register mark forming apparatus according to the present invention.

A printing plate P such as a PS plate used for planographic printing is placed on the drawing board 1. Register marks are formed on the surface of the printing plate 1 by using a drawing ben 10 and a thermal transfer block 11 attached to a drawing head 5 for forming the register marks. The drawing head 5 is slidably attached to the X-axis seal 31': l', and is provided on two opposing lines of the drawing board 1.
It is mounted on the Y-axis seals 2, 2 and is slidable, and as a result, the drawing head 5' is mounted on the drawing board 1.
- The drawing head 5 is configured to be movable in a circle on the Y plane, and the drawing head 5 is moved in this manner.

Stop ``C'' is controlled by a computer (not shown). On the other hand, the printing plate P is drilled with pin holes by the pins of the bunch block 8 installed in plural numbers so as not to cause misalignment. It is fixed with a pin.
Method 11 for fixing the printing plate P Without being limited to the above-mentioned embodiment, the printing plate 1 with pin holes formed in advance is fixed on the drawing board by simply protruding a pin. By placing and fixing the hole and pin so that they fit together.
Alternatively, other fixing methods may be used.

The drawing pen 101c is attached to the pen support 9 so as to be movable up and down, and any means capable of drawing well on the surface of the first printing plate, such as a ballpoint pen or a hollow pen, can be used. This drawing pen 4Ql is used to draw the registration mark 52 for positioning the original film plate shown in Figure 2 during close contact printing. It's good to see a clear, thin line. Therefore, for this purpose, 1 may be used in place of a drawing pen with a marking needle, and the registration mark 52 may be formed with a marking line.

A thermal transfer block 11 is also shown in FIG.

It is used to form the register mark 53. That is.

As mentioned above, the register mark is detected by an optical sensor on the printing press at 5 o's, and the register of the printing plate is adjusted based on this detection signal. If the printing plate is a positive type, the registration mark forming area is not exposed to light and the photosensitive layer must remain. However, with normal drawing means such as ballpoint pens and hollow pens, it is impossible to form thin lines and ink thick enough to prevent light from passing through, and the photosensitive layer in the registration mark forming area reacts. There's a problem.

Therefore, a thermal transfer method is effective because it can apply thick ink without unevenness and can form lines of a certain thickness in just one drawing.

Color of register mark 53 1. Alternatively, it is sufficient to use a color such as black or silk that has a sufficient density difference between the area around the register mark 53 (in this case, the aluminum plate substrate) and the optical sensor.

The structure of the thermal transfer block is clearly illustrated based on FIGS. 3 and 4.

FIG. 3 is an explanatory view showing the internal state of the thermal transfer block, and FIG. 4 is an explanatory view showing a cross section taken along line 1-1 in FIG. 3.

A pair of engaging convex portions 25 and 25 provided on the back plate of the housing 11' of the thermal transfer block 1111 are connected to the drawing head 5.
The long hole 2 has a longer overall length than the engaging protrusion provided in the
6, 26, and the engaging protrusion 25.2 is configured such that the engaging protrusion 25.25 is disengaged from the elongated hole 26, 26.
1 has locking rings 25', 25' fixed to the tip of 5;
This allows the drawing head 5 to be mounted so as to be movable only in the vertical direction.

1211 Mother Marhenod, mounting bracket 16°13
It is fixed to the body 11' at 1, and the lower surface j1 of the thermal head protrudes downward from the lower edge of the body 11'.

Thermal transfer paper 141': The paper is guided from the feed roll 16 to the lower surface of the thermal head 12 by the guide pulley 15.

Furthermore, after transfer 1. The soil is wound onto a take-up roll 17 via a soil guide pulley 15. Note that the movement of the thermal transfer paper is carried out by the take-up roll drive motor 27.

Further, a projection 21 protrudes from the back plate of the housing 11' of the thermal transfer block 11, and this projection 21't'! ,
Insert into the elongated hole 22 provided in the drawing head 5] [η].

1. Fixed to the shaft of the rotary solenoid 18. The swing arm 19 is engaged with an elongated hole 20 provided at one end of the swing arm 19. Also, at the other end of the swinging arm 19, a coil spring 1 is applied to the swinging arm 19 to apply a rotational force in the direction of rotation when opening.
This coil spring 1911 is attached to a spring attachment protrusion 24 protruding from the wall surface of the drawing head 5.

Therefore, when current is applied to the rotary solenoid 18, the swinging arm 19 rotates counterclockwise against the resistance of the coil spring 19 and pushes down the protrusion 21, causing the thermal transfer block 11 to move downward. move and thermal head 12
By pressing the thermal transfer paper 14 with moderate pressure against the printing plate surface 11fi and selectively activating the heating element, the transfer material is transferred to the printing plate surface to form the desired image. It is possible to form υ.

Swinging arm 191. The thermal transfer block 11 then returns to its original position and rises.

The operation of the thermal transfer block 11 having the above-mentioned structure is controlled by a computer (not shown), and a register mark of a predetermined shape can be formed at a predetermined position on the surface of the printing plate.

Note that the register mark forming means i′i shown in the above embodiment
Although it is a thermal transfer method, this invention is not limited to this.
5. As a register mark forming means, the accuracy of the mark forming position is good, and the color around the register mark forming part (usually the color of the aluminum base) and the degree of reflection are different, so it can be clearly distinguished with an optical sensor. Available colors (e.g. black, navy blue, etc.)
The color of the register mark can be set to a suitable color, and it has sufficient blocking ability in consideration of the case where the printing plate is a blank type.
Any means capable of forming a 1" image without being removed in the fixing process is included in the present invention.

As a means of creating such an image, an ink layer is formed using a heat-sensitive adhesive. There are hot stamping methods in which the markings are transferred from the base sheet and adhered to the surface of the printing plate, a stamping method in which a transfer material is cut out in advance in the shape of the register mark, a sealing method in which the markings are transferred to the surface of the 11th printing plate, and an inkjet method.

This can be applied arbitrarily.

As described above, according to the present invention, a single drawing head is used to draw registration marks on the surface of a fixed tongue-shaped printing plate for positioning when printing in close contact with a film original, and to perform development and development.
Since this is a register mark drawing device that can form register marks that can maintain a clear image even after the fixing process, the accuracy of both the absolute position of the register mark mark-1j plate and the relative position with respect to the registration mark is high. In addition, it is possible to form a register mark that satisfies the above requirements and is much more easily detected by an optical sensor on a printing press than conventional ones.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing essential parts of the invention, FIG. 2 is a plan view showing the state of register mark formation on the surface of the marking plate 111, and FIG. °
FIG. 4 is an explanatory diagram showing the internal state of the thermal transfer block, and FIG. 6 is an explanatory diagram showing a cross section taken along the line 1-1 in FIG. 1 - Drawing board, 5... Drawing head, iQ... Drawing pen. 11... Thermal transfer block, 51... Pin hole, 52
...Tonbo mark, 53...Register mark, P...Printing plate patent applicant Toppan Printing Co., Ltd. 21'51 Figure 105 Figure 2 2 1 51

Claims (1)

[Scope of Claims] 1) In an apparatus for forming various register marks on the surface of a printing plate in front of a printing plate fixed on a drawing board, the drawing head is movable on the drawing board. This drawing head is provided with a drawing means for forming register marks on the surface of the printing plate for positioning when printing the film master in close contact with the printing plate. cJv Have you provided a means for blocking long-band light and forming register marks on the surface of the printing plate using a substance whose reflection density differs from the color of the aluminum substrate of the printing plate? Characteristic register mark forming device.