JPH0512000Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a puncher for punching a negative film, which is used to form punch holes at predetermined positions in a negative film in a printing plate manufacturing process.

(Prior art and its problems) As a conventional simple puncher, a punch hole punching mechanism is arranged at a predetermined position on a film mounting table, and after the film is placed on the film mounting table, the punch is punched by operating a handle. A device is known in which a hole punching mechanism is actuated to punch holes in a film. In this type of puncher, an alignment mark is provided at a predetermined position on the top surface of the film mounting table in order to achieve positional accuracy of the punch hole, and after aligning the register mark previously formed on the film with the alignment mark, A punch hole is formed by operating the handle.

However, the above alignment marks are simply formed by drawing lines on the top surface of the mounting table, so when aligning negative film where the registration marks are formed in the shape of narrow translucent slits, the registration marks cannot be used. There has been a problem in that it is difficult to distinguish between when the mark and the alignment mark match and when they do not, and as a result, it becomes difficult to align the negative film. Note that the printing position on the negative film is determined based on the punch hole, so
If a punch hole is formed with the register mark and the alignment mark misaligned, the printing position on the negative film will also be misaligned in accordance with the misalignment.

(Purpose of the invention) This invention was made to solve the above problem, and when making a printing plate, the alignment mark formed on the opaque sheet and the registration mark formed on the negative film are separated. It is an object of the present invention to provide a puncher for punching a negative film, which can easily and accurately form punch holes at predetermined positions on a negative film by aligning the holes using transmitted light.

(Means for Achieving the Object) This invention provides a punch hole punching mechanism and an alignment mark at a predetermined position on a film mounting table, and aligns the register mark formed at a predetermined position on a negative film. Place the negative film on the film mounting table so as to match the mark,
The negative film puncher is configured to punch holes in the negative film by the punch hole punching mechanism, wherein the film mounting table has a transparent plate on its upper surface side, and a transparent slit is formed therein. An opaque sheet is pasted on the transparent plate to form the alignment mark with its transparent slit, and an illumination device is provided below the transparent plate to illuminate the alignment mark. Features.

(Embodiment) FIG. 1 shows a perspective view of a puncher for perforating a negative film, which is an embodiment of the invention, and FIG. 2 shows a plan view thereof.

In the puncher 1, a punch hole punching mechanism 3 is disposed at a predetermined position at the upper end of a film mounting table 2, and a film insertion space 6 is formed between the punch hole punching mechanism 3 and the upper surface of the mounting table. The punch hole punching mechanism 3 is operated by pushing downward an operating lever 7 which is rotationally biased upward by a spring (not shown).
The negative film inserted into the film insertion space 6 is configured to have three punch holes.

A transparent plate (not shown) is provided on the upper side of the film mounting table 2, and an opaque sheet 8 shown in FIG. 3 is adhered onto the transparent plate. Opaque sheet 8
is made of, for example, polyester film,
Transparent slit-shaped alignment marks 9a, 9b are placed at predetermined positions on the outer periphery using an automatic drawing machine or the like.
and the dragonfly mark 9c can be marked out with high precision. In this case, the alignment marks 9a on both side edges are used for alignment in the vertical direction, and the alignment marks 9b on the lower edge are used for alignment in the width direction. Although these marks 9a to 9c are drawn wide in the drawing for convenience of explanation, their actual width is the same as that of the register marks 12a and 12b on the negative film 11. Furthermore, three punch holes 10 are formed at the upper end of the opaque sheet 8 at positions a predetermined distance from the alignment mark 9a. This opaque sheet 8 is pasted on the transparent plate of the film mounting table 2 so that the punch holes 10 are aligned with the punch hole formation positions of the punch hole punching mechanism 3 shown in FIG.

On the other hand, a lighting device (not shown) is installed inside the film mounting table 2 to illuminate the opaque sheet 8 from below through a light-transmitting plate. When this illumination device is turned on, the translucent slit-shaped alignment marks 9a, 9b and the register mark 9c are illuminated by the illumination light in a floating manner.

Note that 5 is an alignment plate for quickly placing the negative film 11.

To form punch holes in the negative film 11 shown in FIG. 4 using the puncher 1 described above, the following procedure is followed. In this case, the alignment marks 9a, 9 are placed on the peripheral edge of the negative film 11.
Transparent slit-shaped registration mark 12 corresponding to b
It is assumed that a and 12b are formed. The procedure is to first turn on the illumination device of the puncher 1 to illuminate the alignment marks 9a and 9b, then insert the upper end of the negative film 11 into the film insertion space 6, and place the negative film 11 on the film. Place it on the stand 2. At that time, the marks on the alignment plate 5 and the register marks 12a, 12 on the negative film 11 are
The negative film 11 is placed so that b approximately matches. Next, the negative film 11 is moved vertically and horizontally on the film mounting table 2.
Align the register marks 12a and 12b with the alignment mark 9
Align to a and 9b, respectively. In this case, the register marks 12a and 12b are the alignment marks 9
When a and 9b match, the illumination light from below is received and illuminated, so visibility is good and alignment can be easily and reliably confirmed. When the alignment is completed in this manner, the operating lever 7 is pushed down and the punch hole punching mechanism 3 punches a hole at the upper end position of the negative film 11.

In this way, the transparent slit-like alignment marks 9a and 9b are illuminated from below, and the negative film 1 is
1, the negative film 11 can be aligned easily and reliably, and as a result, punch holes can be formed at predetermined positions on the negative film 11 with high accuracy. . In this way, when the punch holes are formed at predetermined positions with high precision, the printing of the negative film 11 can also be performed with high precision at the predetermined positions using the punch holes as references.

In addition, since the alignment marks 9a and 9b are formed at a certain distance from the punch hole forming position of the punch hole punching mechanism 3, when using a plate with constant external dimensions and a register mark at a predetermined position. With this method, punch holes can always be formed at fixed positions around the outer periphery of the plate. Furthermore, if you use such a version,
When feeding a plate to a printing press, the plate is fed toward the plate cylinder by the plate feeding mechanism using the outer periphery of the plate as a reference, and the punched hole is engaged with the positioning pin of the plate cylinder, making it possible to perform automatic plate feeding. .

(Effects of the invention) As described above, according to the puncher for punching negative film of this invention, the positioning mark in the form of a translucent slit formed on the film mounting table is illuminated from below and the negative film is Since the alignment mark is aligned with the registration mark, visibility is good and it is very easy to distinguish when the alignment mark and the registration mark match. Therefore,
It is possible to easily align the register mark and the alignment mark, and punch holes can be formed at predetermined positions on the negative film with high precision.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a puncher for perforating negative film, which is an embodiment of this invention, Fig. 2 is a plan view thereof, Fig. 3 is a plan view of an opaque sheet used in the puncher, and Fig. 4 is a perspective view of a negative film puncher. FIG. 1... puncher, 2... film mounting table, 3...
... Punch hole perforation mechanism, 8 ... Opaque sheet, 9
a, 9b, 9c... alignment mark, 11... negative film, 12a, 12b... registration mark.

Claims (1)

[Claims for Utility Model Registration] (1) A punch hole punching mechanism and an alignment mark are arranged at a predetermined position on a film mounting table, and a register mark formed at a predetermined position on a negative film is aligned with the alignment mark. A puncher for punching a negative film, wherein the negative film is placed on the film mounting table so as to be aligned with each other, and the punch hole is punched in the negative film by the punch hole punching mechanism, the puncher comprising: (a) the film; The mounting table has a translucent plate on its upper surface, (b) an opaque sheet with translucent slits formed thereon is adhered onto the translucent plate, and the alignment marks are formed by the translucent slits; (c) A puncher for perforating a negative film, characterized in that an illumination device for illuminating the alignment mark is provided below the transparent plate. (2) The puncher for punching a negative film according to claim 1, wherein the alignment mark is provided at a certain distance from a punch hole forming position by the punch hole punching mechanism.