JPH0412942A - Automatic plate feed method for planographic printing plate - Google Patents

Abstract

PURPOSE:To surely take out one by one from planographic plates of many piled plates by providing a position regulating stopper on the front end of a plate storing table, locking a planographic printing plate lifted with a sucking cup for transporting to the position regulating stopper, and forcedly deflecting it. CONSTITUTION:In the condition which a position regulating stopper 7 is fitted on the end part on the plate feed side of a plate storing table 1, a transporting suction cup 3 is sucked on the uppermost face of piled planographic printing plates, and the sucked planographic printing plate P is lifted up to the position not to exceed the upper end of the stopper 7. Nextly, while locking the front end of the planographic printing plate p1 with the stopper 7, the transporting sucking cup 3 is advanced to forcedly give deflection to the plate P1, and another planographic printing plate contacted on the back side of the plate P1 is separated.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an automatic plate feeding method for lithographic printing plates, and more specifically, the present invention relates to an automatic plate feeding method for lithographic printing plates. This invention relates to an automatic plate feeding method for conveying to the next process.

[Prior art]

Generally, the surface of a photosensitive lithographic printing plate is coated with a thin cover film for surface protection, and the cover film is peeled off when the lithographic printing plate is used for printing. This cover film peeling operation is carried out by suctioning a large number of photosensitive lithographic printing plates stacked one by one on a storage board table one by one using a suction cup for conveyance and feeding them to a cover film peeling device.

However, when a plurality of lithographic printing plates coated with cover films are laminated as described above, the lamination tends to generate very strong adhesion between them.

Therefore, when lifting one sheet at a time using the transport suction cup, multiple sheets are lifted at the same time, and if they are fed as is to the cover film peeling device in the next process, the lithographic printing plate may be damaged or the cover film may not be peeled off completely. This caused problems such as

(Problems to be Solved by the Invention) The purpose of the present invention is to solve the above-mentioned conventional problems, and to reliably convert multiple stacked lithographic printing plates into one by simply using a simple mechanism on the device. An object of the present invention is to provide an automatic plate feeding method for a lithographic printing plate, which allows each plate to be taken out one by one.

[Means to solve the problem]

To achieve the above object, the present invention provides an automatic plate feeding method in which a large number of lithographic printing plates stacked on a plate storage table are separated one by one by a conveying suction cup and conveyed to the next process. With the position regulating stopper attached to the end of the feeding plate,
The conveyance suction cup is sucked to the top surface of the stacked planographic printing plates, and the sucked planographic printing plate is raised to a position where its front end does not exceed the upper end of the position regulating stopper. By moving the conveyance suction cup forward while the front end is kept locked to the position regulating stopper, lithographic printing is forcibly bent, and other lithographic printing plates that are in close contact with the back side of the lithographic printing plate are separated. It is characterized by this.

In this way, the lithographic printing plate is engaged with the position regulating stopper and forced to bend, so that only the lithographic printing plate that was directly sucked by the transportation suction cup remains, and the other lithographic printing plates that were in close contact with this lithographic printing plate remain. The lithographic printing plate will be automatically separated.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description will be made with reference to an apparatus for implementing the present invention shown in the drawings.

In FIG. 1, numeral 1 denotes a storage board on which a large number of photosensitive lithographic printing plates P are stacked, and numeral 2 denotes a cover film peeling device to which the photosensitive lithographic printing plates P are fed in the next step. A transportation suction cup 3 and a restraining plate 3a are attached to the upper part of the storage plate stand 1. The conveyance suction cup 3 and the restraining plate 3a are attached to a support frame 6 provided at the tip of a rod of an actuator 4 for longitudinal driving.
It moves back and forth as shown by arrow A by the operation of , and also moves up and down as shown by arrow B by an actuator 5 for vertical driving attached to the support frame 6 .

A position regulating stone bar 7 is provided at the end of the plate storage table 1 on the side in the feeding plate direction.
is attached, and a delivery guide vi8 is provided between the plate storage stand 1 and the cover film peeling device 2.

The cover film peeling device 2 is provided with a supply roller 9 and a nip roller 10 at its receiving portion, and further provided with a guide plate 11 at the rear thereof. The nip roller 10 is designed to come into contact with and separate from the co-feeding roller 9, and supplies the photosensitive planographic printing plate P fed from the plate storage table 1 to the guide plate 11 by nipping it. It has become. A stone bar 12 is provided on the guide plate 11 so as to move up and down.

In the above-described apparatus, in order to implement the automatic plate feeding method for lithographic printing plates according to the present invention between the plate storage table 1 and the cover film peeling device 2, the steps shown in FIGS. 2(A), (B),
This is carried out by the steps shown in (C) and (D).

First, the actuator 5 is activated to lower the conveyance suction cup 3 as shown by the chain line in FIG. Next, as shown in FIG. 2(A), the actuator 5 operates upward to raise the conveying suction cup 3, and the front end of the lithographic printing plate P lifted by the conveying suction cup 3 reaches the upper end of the position regulating stopper 7. Once it is raised to a position that does not exceed , it is stopped. At this time, a plurality of other lithographic printing plates P are often closely attached to the back side of the lithographic printing plate P that is lifted up.

Next, as shown in FIG. 2(B), while the front end of the lifted lithographic printing plate P is kept locked to the position regulating stopper 7, the conveyance suction cup 3 is moved forward by the forward movement of the actuator 4. This forward movement forces the lithographic printing plate P to curve and deform. Due to the bending caused by such forced curved deformation, only the uppermost lithographic printing plate P+ is left on the conveyance suction cup 3, and the lithographic printing plate that was in close contact with the back side is automatically separated and falls. .

As shown in FIG. 2(C), the conveyance suction cup 3, which has reached the height of the uppermost lithographic printing plate P+, is then moved backward by the backward movement of the actuator 4, and moved by the supply roller by the upward movement of the actuator 5. 9 and the nip roller 10 to a position substantially corresponding to the gap between the rollers 9 and 10.

Next, as shown in FIG. 2(D), the conveyance suction cup 3 that has attracted the lithographic printing plate P+ is advanced by the forward movement of the actuator 4, and its front end is passed between the supply roller 9 and the nip roller 10 to the stopper 12. Stop when it is locked. In such a forward movement operation, the delivery guide plate 8 guides the front end of the lithographic printing plate p1 and acts to reliably guide it between the supply roller 9 and the nip roller AE0.

When the front end of the lithographic printing plate P+ is locked to the stopper 12 as described above, the nip roller 10 contacts the supply roller 9 to nip the lithographic printing plate P1, and the stopper 12 is recessed to remove the inside of the cover film peeling device 2. be transported to.

On the other hand, the conveyance suction cup 3 that has finished conveying the lithographic printing plate Pl is returned to the position indicated by the solid line in FIG. 1 by the backward operation of the actuator 4.

According to the plate feeding method described above, it is possible to reliably take out a large number of lithographic printing plates stacked on the plate storage table one by one and feed them to the cover film peeling device, unlike the conventional method. It does not occur that multiple sheets are involved.

〔Effect of the invention〕

As described above, according to the plate feeding method of the present invention, a position regulating stopper is provided at the front end of the plate storage table, and the lithographic printing plate lifted by the transport suction cup is locked to this position regulating stopper and is forcibly bent. This makes it possible to reliably take out a large number of stacked lithographic printing plates one by one.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of an apparatus for carrying out an automatic plate feeding method for lithographic printing plates according to the present invention, and FIGS. 2 (A) to (D) show an automatic plate feeding method according to the present invention using the above apparatus It is a process diagram explaining the process of carrying out. l...Plate storage table, 2...Cover film peeling device (next process device), 3...Suction cup for conveyance, 4...(For front and back drive) actuator, 5...(For vertical drive) )Actuator, 7...Position regulation stopper 8...Delivery guide plate. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Scope of Claims] In an automatic plate feeding method in which a large number of lithographic printing plates stacked on a plate storage table are separated one by one by a conveying suction cup and conveyed to the next process, the feeding plate side of the plate storage table is provided. With a position regulating stopper attached to the end, the conveying suction cup is sucked to the top surface of the stacked planographic printing plates, and the sucked planographic printing plate is moved so that its front end exceeds the upper end of the position regulating stopper. Then, while the front end of the planographic printing plate is locked to the position regulating stopper, the conveyance suction cup is moved forward to forcibly bend the planographic printing plate. An automatic plate feeding method for lithographic printing plates that separates other lithographic printing plates that are in close contact with the back side.