JPH0241618Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a document film storage cassette attached to an automatic exposure machine used in the plate-making process of photosensitive printing plates for offset printing, letterpress printing, etc.

An automatic exposure machine is known as an apparatus for obtaining printing plates for offset printing or letterpress printing by photolithography. This automatic exposure machine overlays the original film on the photosensitive layer of the plate material that is automatically conveyed to the exposure section, and exposes it in this state. For example, if the photosensitive layer is negative, the negative film is used as the original, and Light is selectively applied to only the photosensitive layer that overlaps the image area of the original, and that area is cured, and the area that is not exposed to light is eluted in a subsequent process. In this way, a printing plate having an image area and a non-image area is obtained.

However, even with conventional automatic exposure machines, overlaying the original film on the photosensitive layer of the printing plate was done manually, which was inefficient. Therefore, the present applicant proposed, in Japanese Patent Application No. 175,675/1983, a document film storage cassette which can automatically pull out a predetermined document film onto the printing plate.

Such a storage cassette has a holder that holds a plurality of original films spaced apart in the vertical direction near the exposure section. The original film is placed in the drawer position, and then the original film is pulled out to the exposure section using a finger device or the like, and the exposed original film is stored in the cassette again.

However, in the above-mentioned storage cassette, the original films are held in a hanging state, and the original films overlap each other. As a result, each original film gets stuck due to static electricity, moisture, etc., making it impossible to draw out and store the original film smoothly.Furthermore, it is difficult to distinguish between original film that has been exposed and original film that has not yet been exposed. There is a risk that the exposed original film may be used again for exposure, or that the original film that has not yet been exposed may be forgotten to be used.

The present invention has been made to improve the above-mentioned problems, and provides a storage cassette for original films that prevents original films from completely overlapping each other and allows easy confirmation of exposed and unexposed original films. The purpose is to provide

In order to achieve this object, the original film storage cassette according to the present invention includes side plates arranged vertically and spaced apart from side to side, and hanger locking members attached to the inner surfaces of these side plates at equal intervals in the vertical direction. and,
The guide bar has a U-shape in plan view and extends between the side plates at approximately the same height or slightly below the hanger locking member and protrudes from the side opposite to the side where it is attached to the exposure section. A bar-shaped hanger that clamps the upper end of the film is stretched horizontally between the hanger locking members to hold a plurality of original films spaced apart in the vertical direction, and an unexposed original film is hung down through the guide bar. On the other hand, by hanging the exposed original film without passing through the guide bar,
The gist is that an unexposed original film and an exposed original film can be separated and hung.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of an automatic exposure machine equipped with a document film storage cassette according to the present invention, and FIG. 2 is a front view of the document film storage cassette.

The automatic exposure machine 1 is composed of a plate supply section 2, a plate transport section 3, and an exposure section 4. A paper receiving box 5 is placed on the side of the plate supply section 2, and a book tray is placed in front of the exposure section 4. A storage cassette 6 for original film according to the invention is attached.

A cart on which a large number of printing plates 7 are placed can be moved in and out of the printing plate supply section 2 from the direction of arrow A, and the printing plates 7 placed on this cart can be lifted by a plate feeding lifter (not shown). The position of the uppermost plate material 7 is always kept constant.

Additionally, a slip paper ejecting device 8 is provided at the top of the plate material supply section 2.
and plate material transfer devices 9, 9 are provided.

The interleaf sheet discharge device 8 has a cylinder unit 11 fixed in the horizontal direction to a support 10 which can be moved up and down by a cylinder unit (not shown), and a rod 12 of the cylinder unit 11 has a movable unit 11 at the tip of a rod 12 facing above the plate material 7. Attach the body 13 and attach the cylinder unit 1.
1 causes the movable body 13 to move along the guide rod 14 in the direction B in the figure, and furthermore, rollers 15, 15 made of rubber or sponge are placed below both ends of the movable body 13 in the direction in which the interleaving sheet is ejected by a motor. I try to make it rotate.

Then, the support body 10 is lowered to the lower position,
The roller 15 is brought into contact with the interleaving paper on the plate material 7, and in this state, the roller 15 is rotated in the discharge direction to move the interleaving paper to the left in the figure. When the interleaving paper has moved a predetermined distance, the cylinder The unit 11 is operated to move the roller 15 together with the movable body 13 to the left in the figure, and the interleaf paper is discharged into the receiving box 5 by the movement and rotation of the roller.

In addition, the plate material transfer device 9 has moving members 17, 17 attached to a pair of guide rods 16, 16 extending in the left-right direction in the figure.
Vacuum pads 19 which are moved up and down by a cylinder unit 18 are attached to the plate, and its action is as follows: First, the vacuum pad 19 is lowered by the operation of the cylinder unit 18, and the upper surface of the plate material 7 from which the interleaving paper has been removed is adsorbed. And cylinder unit 1
8 is operated in the opposite direction to raise the vacuum pad 19 with the plate material 7 adsorbed, and then the motor 20
By driving the movable member 17 along the guide rod 16 to the right in the figure and facing the belt conveyor 21 of the conveying section 3, the suction state is released.
The plate material 7 transferred onto the belt conveyor 21 is conveyed to the exposure section 4, where it is overlapped with the original film pulled out from the original film storage cassette 6 and exposed.

As shown in the front view of FIG. 2 and the perspective view of FIG.
vertical guide rods 23 and 24 are fixedly installed on the
A document film holder 25 is attached to these guide rods 23 and 24. That is, the holding body 25
Support plates 27, 27 are bridged between the left and right side plates 26, 26 to make the whole into a frame shape, brackets 28 provided on the outer surfaces of the side plates 26, 26 are fitted onto the guide rods 23, 24, and the guide rods 23 ,24
In contrast, the holding plate 25 is made vertically movable, and
A pipe 29 with a male thread carved on the inner circumferential surface is fixed to one bracket 28a, and a rod screw 31 rotated by a motor 30 fixed to the base 22 is screwed onto this pipe 29. By driving the holder 25, the holder 25 moves up and down along the guide rods 23 and 24.

Furthermore, hanger locking members 32 having recesses formed in their upper portions are attached to the inner surfaces of the side plates 26, 26 at regular intervals in the vertical direction, and original film 33 is secured to the recesses of these hanger locking members 32. By locking both ends of the bar-shaped hanger 34,
A plurality of original films 33 . . . are held by a holder 25 . Incidentally, small diameter portions 34a, 34a are formed on both sides of the bar-shaped hanger 34.
a and 34a are placed in the exposure section 4, and by moving the chucking device, the original film 33 is pulled out from the storage cassette 6, and the exposed original film 33 is returned to the storage cassette 6. I'm trying to change it back to .

Further, a guide bar 35 is attached between the side plates 26 and 26, and projects from the side opposite to the exposure section 4. The guide bars 35 are provided corresponding to the plurality of original films 33 held by the holder 25, and the guide bars 35 are installed at approximately the same height as the hanger locking member 32 or slightly lower than the hanger locking member 32. There is. Before exposure, each original film 33 is hung on a guide bar 35 as shown in FIG.

On the other hand, a support plate 36 is provided upright on the side of the guide rod 23 in parallel with the guide rod 23, and a plurality of limit switches 37 are attached to this support plate 36. The spacing between these limit switches 37 is made equal to the spacing between the hanger locking members 32, and the limit switches 37 are turned on and off by operating pieces 38 attached to the bracket 28b of the holder 25.

The operation of the storage cassette 6 constructed as described above will be described below.

Here, a case will be described in which the upper original film 33 is sequentially exposed starting from the lowermost original film 33. First, the motor 30 is driven, and the operation piece 3
8 actuates the limit switch 37a at the top of the holder 2 until the drive circuit of the motor 30 is turned off.
5 is raised so that the lowermost original film 33 is aligned with the pulled-out position at this position.

Then, the chucking device in the exposure section 4 is operated to draw the lowermost original film 33 into the exposure section 4, and the original film 33 is conveyed into the exposure section 4 and placed on the plate material 7 positioned on the vacuum surface plate. 33 are superimposed and exposed from above. When a predetermined number of plates have been exposed by repeating the exposure operation, the chucking device is moved, the original film is returned to the storage cassette 6, and both ends of the bar-shaped hanger 34 holding the original film 33 are tightened again. Place it on the recess of the hanger locking member 32. In this case, the document film 33 is not hung on the guide bar 35 and is held hanging from the hanger locking member 32.

Next, exposure is performed using the second original film 33 from the bottom, but in this case, the operation piece 38
actuates the limit switch 37b on the second stage from the top, lowers the holder 25 until the drive circuit of the motor 30 is turned off, and aligns the document film 33 on the second stage from the bottom with the film extraction position. Thereafter, the original film 33 is drawn into the exposure section 4 in the same manner as described above, and after exposing a predetermined number of plates, the original film 33 is returned to the same position in the storage cassette 6. In this case as well, the returned original film 33 is held hanging vertically without being caught on the guide bar 35, as described above.

In this way, the original film 33 is sequentially exposed from below, and the exposed original film 33 is returned to the storage cassette 6 again. This state is shown in FIG.

On the other hand, the exposed plate material 7 is transported to the next process,
Here, the portions not exposed to light are eluted with a developer, such as water, to obtain a printing plate having concavities and convexities corresponding to the image areas of the original film.

As explained above, according to the present invention, when holding a plurality of original films spaced apart in the vertical direction in the original film storage cassette, the cassette is provided with a guide bar that protrudes on the side opposite to the exposure section, and the guide bar The unexposed original film is hung on the cassette, and when the exposed original film is returned to the cassette, it does not hang on the guide bar. This prevents the original film from coming into close contact with each other and prevents the effects of static electricity, moisture, etc. In addition, since you can tell at a glance which original film has been exposed and which original film has not been exposed, you can ensure that only the required number of sheets are exposed, and it is also easier to replace the original film. It is also useful as a guide.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an automatic exposure machine to which the original film storage cassette according to the present invention is applied, Fig. 2 is a front view of the storage cassette, Fig. 3 is a perspective view of the storage cassette, and Fig. 4 is a predetermined FIG. 3 is a perspective view of the storage cassette after the number of original films has been used for exposure. In the drawings, 1 is an automatic exposure machine, 2 is a plate supply section, 3 is a transport section, 4 is an exposure section, 6 is a storage cassette, 7 is a plate material, 23 and 24 are guide rods, 25
26 is a holder, 26 is a side plate, 32 is a hanger locking member, 33 is an original film, 34 is a bar-like hanger, and 35 is a guide bar.

Claims (1)

[Scope of Claim for Utility Model Registration] A plurality of original films are held at a distance in the vertical direction, and a predetermined original film is moved up and down along a guide rod installed near the exposure section of an automatic exposure machine, so that a predetermined original film can be moved to a document drawer position. In the original film storage cassette, the storage cassette has side plates vertically arranged and spaced apart from each other, and hanger locks attached to the inner surfaces of these side plates at equal intervals in the vertical direction. member, and a U-shaped guide bar in plan view that extends between the side plates and protrudes at approximately the same height or slightly below the hanger locking member and on the side opposite to the side where it is attached to the exposure section. A bar-shaped hanger that clamps the upper end of the original film is horizontally stretched between the hanger locking members to hold a plurality of original films spaced apart in the vertical direction, and an unexposed original film is held by the guide bar. An original in an automatic exposure machine, characterized in that an exposed original film is hung down without passing through a guide bar, and an unexposed original film and an exposed original film can be separated and hung. Film storage cassette.