JPH1148629A - Light-sensitive lithographic printing block, and device and method for end processing for light-sensitive lithographic printing block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing block of good carrying properties for preventing the adhesion of ink on the ends of a light-sensitive lithographic printing block, also protect a printing paper from fouls and also provide an end processing device and an end processing method optimum for manufacturing such a printing block. SOLUTION: An end processing device is provided with a lower roller (a supporting means) 41 having a cylinder face (a supporting section) 42 for supporting the back of a printing block 10 and a channel 43 formed on the position corresponding to the end of the printing block 10, and a pressing means (an upper roller 3, a spring and the like) pressing a conical face (an inclined face) 32 inclined in the direction closer to the lower roller 41 as being closer to the printing block 10 on an end of the surface of the printing block 10, and the end of the printing block 10 is pressurized from the surface side of the printing block 10 and crushed, and the end on the back side of the printing block 10 is formed into a protrusion following the crushing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive lithographic printing plate having a photosensitive layer formed on a metallic support, an edge processing apparatus for processing an edge of the photosensitive lithographic printing plate, and an edge processing apparatus. Regarding the processing method.

[0002]

2. Description of the Related Art A photosensitive lithographic printing plate is, for example, a PS plate (Pre-Sen) having a photosensitive layer formed on a metallic support.
It is widely used in the printing industry as a (SizedPlate). This photosensitive lithographic printing plate (hereinafter also referred to as a printing plate) is provided on the surface of a coiled aluminum support,
After performing a surface treatment (for example, graining, anodic oxidation, and chemical conversion treatment), the photosensitive layer is applied and dried. Then, in order to easily perform the later-described cutting or to prevent the photosensitive layer from being damaged, a protective sheet (hereinafter, referred to as a slip sheet) is placed on the surface of the printing plate on the photosensitive layer side. , Cut to the desired size. Thereafter, the printing plate is subjected to processes such as exposure and development, and is supplied to a rotary press, a printing press, and the like.

When printing is performed on a printing paper having a size larger than the size of the printing plate using such a printing plate, ink adheres to an end (cut surface) of the printing plate, and further, the printing paper is printed. It is printed on and becomes dirty.

In order to prevent this dirt, Japanese Patent Publication No.
No. 46754 proposes an edge treatment in which the corners of the edges of the printing plate are crushed, shaved, or polished by applying pressure. Japanese Patent Application Laid-Open No. 7-32758 proposes an edge processing in which the edge of the printing plate is bent toward the support, because productivity is not improved by this edge processing.

[0005]

[Problems to be solved by the invention]
In the edge treatment described in JP-A-46754, only the edge of the printing plate on the photosensitive layer side is processed, and the surface of the printing plate on the support side is a flat surface. Therefore, for example, when transporting the printing plate to a rotary press or a printing press by a transport unit,
The back surface of the printing plate comes into close contact with the transporting means, causing transport failure.
On the other hand, in the edge processing described in JP-A-7-32758, since the edge of the printing plate is bent toward the support, the transportability is improved without being in close contact with the transport means. By bending, a large tensile stress is applied to the photosensitive layer, cracks are generated on the surface of the support on the photosensitive layer side, and ink adheres to the places of the cracks, which are printed on printing paper and stained.

Therefore, an object of the present invention is to provide a photosensitive lithographic printing plate which prevents ink from adhering to the edge of the photosensitive lithographic printing plate, prevents stains on printing paper, and has good transportability. And Another object of the present invention is to provide an optimum edge processing apparatus and an edge processing method for obtaining such a photosensitive lithographic printing plate.

[0007]

The above object can be attained by the following constitution.

(1) In a photosensitive lithographic printing plate in which a photosensitive layer is formed on a metal support, an end of the photosensitive lithographic printing plate is provided with a crushed chamfer on the photosensitive layer side. A photosensitive lithographic printing plate, wherein a portion is formed and a convex portion is formed on the support side.

(2) In a photosensitive lithographic printing plate having a thickness t in which a photosensitive layer is formed on a metal support, when viewed in cross section, the end portion is closer to the end than the position where the surface on the photosensitive layer side is bent. A photosensitive lithographic printing plate characterized by being bent toward the support so that the thickness at a position adjacent to the substrate becomes thinner than t.

(3) The photosensitive lithographic printing plate as described in (1) or (2), wherein a concave portion is provided at an end of the surface on the support side.

(4) In a photosensitive lithographic printing plate edge processing apparatus for processing an edge of a photosensitive lithographic printing plate in which a photosensitive layer is formed on a metallic support, the edge of the photosensitive lithographic printing plate is processed. The support means for supporting the support side of the photosensitive lithographic printing plate without supporting at least a part of the position corresponding to the part side, and the photosensitive lithographic printing plate, which is supported by the support means, moves toward the end of the photosensitive lithographic printing plate. Pressing means for pressing an inclined surface inclined in a direction approaching the supporting means against an end of a surface on the photosensitive layer side of the photosensitive lithographic printing plate supported by the supporting means; Printing plate edge processing device.

(5) The end processing apparatus for photosensitive lithographic printing plate according to (4), further comprising a moving means for relatively moving the photosensitive lithographic printing plate and the pressing means.

(6) The pressing means has an upper roller having the inclined surface, and the upper roller rotates at a peripheral speed synchronized with a moving speed of the relative movement. (5)
4. The photosensitive lithographic printing plate edge processing apparatus according to claim 1.

(7) The photosensitive lithographic printing plate as described in (6), wherein the support means comprises a lower roller, and the lower roller rotates at a peripheral speed synchronized with the moving speed of the relative movement. End processing equipment.

(8) When viewed in a cross section of the photosensitive lithographic printing plate supported by the support means, the inclined plane is straddled over a portion supported by the support means and a portion not supported by the support means. Is characterized by (4)-
(7) The edge processing apparatus for a photosensitive lithographic printing plate according to any one of (7).

(9) The edge processing apparatus for a photosensitive lithographic printing plate according to any one of (4) to (8), wherein the support means has an uneven portion.

(10) In the method for treating the edge of a photosensitive lithographic printing plate in which a photosensitive layer is formed on a metallic support, the edge of the photosensitive lithographic printing plate may be treated. From the photosensitive layer side, the end of the photosensitive lithographic printing plate is pressed and crushed, and with the crushing, the end of the support-side surface of the photosensitive lithographic printing plate is formed to be convex. End processing method of a photosensitive lithographic printing plate.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an edge processing apparatus according to the present embodiment, in which (a) is a front view and (b) is a perspective view of a main part. FIGS. 2A and 2B are schematic diagrams relating to edge processing according to the present embodiment. FIG. 2A is a schematic diagram of a main part of the edge processing apparatus, FIG. 2B is a cross-sectional view of the main part, and FIG. It is sectional drawing of the processed photosensitive lithographic printing plate.

First, a photosensitive lithographic printing plate (hereinafter, also referred to as a printing plate) 10 to be subjected to edge processing will be described. The printing plate 10 has been subjected to a surface treatment (for example, graining, anodic oxidation, chemical conversion treatment, etc.) on the surface of a coiled aluminum support, followed by application of a photosensitive layer and drying. On the printing plate 10 (on the photosensitive layer side), a protective sheet (hereinafter, also referred to as interleaving paper) is placed on the surface of the printing plate 10 on the photosensitive layer side in order to easily cut or not to damage the photosensitive layer. 11) is mounted thereon, and the coil-shaped printing plate is cut into a desired size. In the present embodiment, the edge processing of the printing plate 10 cut to a desired size will be described. However, as described later, the printing plate 10 may be before being cut, that is, a coil-shaped printing plate. .
In the following description, the surface on the photosensitive layer side of the printing plate 10 is the front surface or the upper surface, and the surface on the support side opposite to the front surface is the back surface or the lower surface, and the surface perpendicular to the front surface and the back surface (cut or cut). The plane parallel to the plane) is called an end face.

The receiving table 21 is a table on which the printing plate 10 on which the slip sheet 11 is mounted is placed on the surface of the receiving table 21. The receiving plate 21 has an end protruding from the end of the receiving plate 21. The printing plate 10 is placed on the table 21. The clamper 22, which is a fixing means, presses the printing plate 10 from the upper surface side (via the slip sheet 11) in the direction of the receiving tray 21, and
This is a means for fixing the upper printing plate 10. In this way, the printing plate 10 together with the interleaf 11 placed on the upper surface thereof,
The cradle 21 and the clamper 22 protrude from the end of the cradle 21 and are fixed on the cradle 21.

A pair of roller pairs consisting of an upper roller 31 and a lower roller 41 for nipping the end of the printing plate 10 (together with the slip sheet 11) fixed on the pedestal 21 is provided at the end of the pedestal 21. Is provided. The upper and lower rollers 31, 41
Are rotatably supported by the first block 35 and the second block 45, respectively.
Are two shafts 51 erected on the second block 45.
Is provided slidably. Further, the first block 35 is configured to be elastically urged downward, that is, toward the second block 45 by a spring 53 provided between the first block 35 and a support block 52 provided at the upper end of the guide shaft 51. doing. With this configuration, the upper roller 31 is elastically urged toward the lower roller 41 and presses the printing plate 10 between the upper roller 31 and the lower roller.

The upper roller 31 is provided on the front or back of the printing plate (which will be described in detail later, but is also the printing plate 10 supported by the lower roller 41) fixed on the receiving table 21. Lower roller 4 toward the end of 10
A conical surface 32 which is an inclined surface inclined to one side;
And a gear 34 is provided coaxially. That is, the upper roller 31, the first block 35, the support block 52, the spring 53, and the like constitute the pressing means of the present invention. However, the pressing means is not limited to this.
Any structure that can press (press) the end of the printing plate 10 may be used.

On the other hand, the lower roller 41 has a groove 43 at a position corresponding to the end of the printing plate 10, and is a cylindrical portion serving as a supporting portion for supporting the back side of the printing plate 10 fixed on the receiving table 21. A gear 44 is provided coaxially with the surface 42. That is, the printing plate 1 is located on the opposite side (leftward in FIG. 1A) of the printing plate 10 from the groove 43.
0, in other words, the cylindrical surface 4
A groove 43 is provided at a position closer to the end of the printing plate 10 than at 2, corresponding to the end of the printing plate 10. Therefore, the lower roller 41 supports the back surface of the printing plate 10 (by the cylindrical surface 42) without supporting the position corresponding to the end side of the printing plate 10 (by providing the groove 43).

Note that “not supporting at least a part of the position corresponding to the end portion” means that the groove portion 43 that does not support the entire end portion of the printing plate 10 as in this embodiment. In addition to providing the printing plate 10, the printing plate 10 may be made to protrude from the end surface of the lower roller 41. Further, as described in a later stage (FIG. 3), the printing plate 10 may not support a part of the end portion of the printing plate 10. It may be.

The positional relationship between the upper and lower rollers 31, 41 will be described in more detail. As shown in FIG. 2B, when viewed from the cross section of the printing plate 10 supported by the lower roller 41, the printing plate 10 is Supporting cylindrical surface 42 and groove 4
3 and a conical surface 3 which is an inclined surface of the upper roller 31
2 is located. The upper roller 31 and the lower roller 4
The gears 34 and 44 provided on each of the gears 1 mesh with each other, and the two rollers 31 and 41 are configured to rotate in synchronization with the relative moving speed with respect to the printing plate 10 unit 60. . In particular, since the upper roller 31 has the conical surface 32, the position at which the conical surface 32 contacts the printing plate 10 (the position where the upper roller 31 contacts the conical surface 32 for the first time when viewed from the center of the printing plate 10; The number of teeth of the gears 34 and 44 is determined so that the peripheral speed of the gears 34 and 44 rotates in synchronization with the relative moving speed of the printing plate 10 unit 60.

The upper and lower rollers 31, 41, the blocks 35, 45, 52, the shaft 51, the spring, and the like are integrally formed as a unit 60. Along a guide shaft 23 which is slidable (slidable) by a moving means (not shown). That is, the upper roller 31 (along with the lower roller 41 in the present embodiment) and the printing plate 10 are relatively slid (the unit 60 is moved in the present embodiment). When the unit 60 is slid, the lower roller 41 moves to the printing plate 1.
Rotational force of the lower roller 41 is transmitted by the gears 34 and 44 meshing with each other by rotating at a peripheral speed synchronized with the sliding movement due to the frictional force nipping the upper roller 3.
The upper roller 31 rotates such that the peripheral speed of one processing unit is synchronized with the sliding movement.

Next, using such an edge processing device,
The edge processing of the printing plate 10 will be described. First, the printing plate 10 is placed on the receiving table 21 together with the slip sheet 11 and fixed by the clamper 22. At this time, the printing plate 10 is fixed so that the end of the printing plate 10 protrudes from the receiving table 21, more specifically, the groove 44 provided in the lower roller 41 so that the end (end surface) of the printing plate 10 is located. (Note that printing plate 10
When fixing, the unit 60 includes the upper and lower rollers 31,
The printing plate 10 has been moved to a position where the printing plate 10 is not pinched by 41).

When the printing plate 10 is fixed, the unit 60 is moved by a moving means (not shown) from an end surface side (left front side in FIG. 2A) orthogonal to an end surface protruding from the receiving table 21 to a side opposite to the end surface. Is slid to the end face side (the right rear side in FIG. 2A). Then, an end of the printing plate 10 is nipped by the upper and lower rollers 31 and 41. At this time, the conical surface 32 which is the inclined surface of the upper roller 31
, The cylindrical surface 4 of the lower roller 41
2 presses the edge of the printing plate 10 supported by it. Thereby, the end on the front side of the printing plate 10 is crushed, and the chamfered portion 13 is formed. Then, along with this crushing, the end on the back side of the printing plate 10 is
The convex portion 14 is formed in the groove portion 43. Then, the unit 60 further continues the sliding movement, and the upper and lower rollers 31, 41 also rotate at a peripheral speed synchronized with the speed of this movement,
The edge of the printing plate 10 is processed.

The printing plate 10 subjected to such edge treatment
Is shown in FIG. 2 (c). As shown in the figure, the printing plate 10 having been subjected to the edge treatment is provided with a chamfered portion 13 crushed to the front side.
Is formed, and a shape in which the convex portion 14 is formed on the back surface side is obtained. Looking at the printing plate 10 from another viewpoint, the printing plate 10
Let t be the thickness of the printing plate 10 (the thickness at the center of the printing plate 10), when viewed from the cross section of the printing plate 10, the end side from the position a (see FIG. 2C) where the surface of the printing plate 10 is bent. Is bent to the back surface side so that the thickness at a position adjacent to the rear surface becomes thinner than t. That is, on the end side from the position a, the printing plate 10 is thinned by being crushed. As will be described in detail later, the thickness does not have to be thinner than t on the end side further than the position adjacent to the end side from the position a, and burrs and the like remain on the end face. The thickness may be greater than t.

Therefore, unlike the prior art, the printing plate 10 is not bent, so that a large tensile stress is not applied to the surface side of the support of the printing plate 10, and the generation of cracks on the surface side of the support can be prevented. In addition, it is possible to prevent ink from adhering to the ends. In addition, since the convex portion 14 is formed on the back surface side of the printing plate 10, when the printing plate 10 is transported to a rotary press or a printing machine by the transport device, the back surface of the printing plate 10 is in close contact with the transport device. However, no transport failure occurs, and the transportability is improved.

As described above, in this embodiment, the edge of the front surface of the printing plate 10 is pressed and crushed from the front surface side of the printing plate 10, and the edge of the back surface of the printing plate 10 is accompanied by the crushing. Since the portion is formed to be convex, it is possible to prevent the ink from adhering to the edge of the printing plate 10 and perform the edge processing for improving the transportability.
The operation of crushing can be performed at once, and the processing time of the edge processing can be reduced.

In this embodiment, the cylindrical surface 42 supporting the back side of the printing plate 10 and the printing plate 1 supported by the cylindrical surface 42 on the end side of the printing plate 10 from the cylindrical surface 42.
0, a lower roller 41 provided with a groove 43 at a position corresponding to an end (end face) of the printing plate 1 supported by the lower roller 41
The upper surface 51 of the printing plate 10 is provided with an upper roller 51, a spring 53, and the like that press the conical surface 32 inclined in a direction approaching the lower roller 41 toward the end of the printing plate 10 toward the end of the surface of the printing plate. The end portion is crushed to form a chamfered portion 13, and simultaneously with this operation, a convex portion 14
Can be formed, and the edge processing for preventing the ink from adhering to the edge of the printing plate 10 and improving the transportability can be performed at once, thereby shortening the processing time of the edge processing. be able to.

Further, in the present embodiment, since the printing plate 10 and the upper roller 31 are relatively moved, the entire end portion of the printing plate 10 can be efficiently processed. Moreover, in the present embodiment, the peripheral speed of the processing unit of the upper roller 31 follows the sliding speed of the unit 60 (synchronous with the sliding movement). Is performed, slips, wrinkles,
No tearing occurs. In particular, in the present embodiment, the rotation of the upper roller 31 is configured to rotate at a peripheral speed synchronized with the moving speed of the relative movement by transmitting the rotational force from the lower roller 41, so that it can be achieved with a simple configuration. However, as will be described later, a driving unit for applying a driving force to the upper roller 31 may be separately provided.

In the above-described embodiment, only the groove 43 is provided in the lower roll 41, but FIG.
As shown in FIG. 5A, the lower roller 41 is provided with a concave-convex portion 46 as a groove, and when the printing plate 10 subjected to the edge processing is viewed in cross section, only the convex portion 14 is provided on the back surface side of the printing plate 10. Alternatively, a recess 15 may be provided (see FIG. 3).
(B)). Further, as shown in FIG. 3C, a plurality of concave and convex portions 46 are provided on the lower roller 41, and when the printing plate 10 subjected to the end processing is viewed in cross section, the convex portions 14 and the concave portions 1 are formed.
5 may be provided (FIG. 3D). When the lower roller 41 is provided with the uneven portion 46, the lower roller 4
By forming the convex portion of the uneven portion so as to bite into the printing plate 10 supported by the first cylindrical surface 42, the convex portion 14 of the printing plate 10 subjected to the short-section processing can be formed more reliably. it can.

Further, in the above description, an example is shown in which the lower roller 41 is used as the supporting means. However, as shown in FIG.
In FIG. 4, members having the same functions and actions as those of the above-described embodiment are given the same reference numerals, and description thereof will be omitted. That is, the upper surface of the pedestal 21 corresponds to the cylindrical surface 42 in the above-described example, and is a support portion that supports the back surface side of the printing plate 10, and is fixed by the pedestal 21 and the clamper 22 without protruding from the pedestal 21. Printing plate 10
The groove 24 is provided at a position corresponding to the end of the groove.
The positional relationship between the groove 24 and the upper roller 31 is the same as described above. As described above, the lower roller 41 is used as a supporting means.
Instead of using, even if using the pedestal 21 which is a flat plate,
Similarly, edge processing can be performed. In this example (FIG. 4), the unit 6 is driven by a driving unit (not shown).
0 is slid, and the rotation of the upper roller 31 is controlled by a motor 61 which is a driving means provided on the shaft of the upper roller 31 so that the processing unit of the upper roller 31 has a peripheral speed synchronized with the sliding speed. I do.

Further, in the above description, the printing plate 1
0 is an example in which the upper roller 31 is slid with respect to the printing plate 10 by being fixed by the receiving table 21 and the clamper 22. However, FIG. As shown in (Description is omitted), the unit 60 may be fixed and the printing plate 10 may be moved. In this case, the transport of the printing plate 10 is stabilized by configuring the cylindrical surface 42 of the lower roller 41 to support the printing plate 10 over substantially the entire width in the width direction orthogonal to the transport direction of the printing plate 10. be able to. Further, in this case, the printing plate 10 is moved (conveyed) so as to apply tension in the moving direction, so that the printing plate 10 is slid in the lateral direction due to the pressing force of the upper roller 31. In addition, it is possible to prevent the printing plate 10 from shifting. As described above, if the edge processing can be performed while moving the printing plate 10, the edge processing can be performed before the printing plate 10 is cut, that is, the coil-shaped printing plate 10 can be continuously processed. Processing capacity is improved.

The inclination angle of the conical surface 32 (the inclination angle with respect to the printing plate 10 supported by the receiving table 21 or the cylindrical surface 42 of the lower roller 41) described above is 10 degrees. When the printing plate 10 is in the fixed state or the transported state, the margin of the end of the printing plate 10 can be increased, thereby reducing the possibility of generating an unprocessed end. it can.

[0038]

According to the present invention described in detail above, a photosensitive lithographic printing plate which prevents ink from adhering to the edge of the photosensitive lithographic printing plate, prevents stains on the printing paper, and has good transportability can be obtained. The task is to provide. Further, in order to obtain such a photosensitive lithographic printing plate, it is possible to provide an optimum edge processing apparatus and an edge processing method.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an edge processing apparatus according to an embodiment.

FIG. 2 is a schematic diagram relating to edge processing according to the embodiment.

FIG. 3 is a diagram showing a modification of the present embodiment.

FIG. 4 is a diagram showing a modification of the present embodiment.

FIG. 5 is a diagram showing a modification of the present embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 photosensitive lithographic printing plate 11 slip sheet 31 upper roller 32 conical surface (inclined surface) 41 lower roller 42 cylindrical surface (supporting portion) 24, 43 groove 53 spring

Claims (10)

[Claims] 1. A photosensitive lithographic printing plate in which a photosensitive layer is formed on a metal support, wherein an end of the photosensitive lithographic printing plate has a chamfered portion crushed on the photosensitive layer side. And a convex portion is formed on the support side. 2. In a photosensitive lithographic printing plate having a thickness t in which a photosensitive layer is formed on a metal support, when viewed in cross section, the photosensitive layer side surface is closer to the end than the bent position. A photosensitive lithographic printing plate characterized by being bent toward the support so that the thickness at an adjacent position is smaller than t. 3. The photosensitive lithographic printing plate according to claim 1, wherein a concave portion is provided at an end of the surface on the support side. 4. A photosensitive lithographic printing plate edge processing apparatus for processing an edge of a photosensitive lithographic printing plate having a photosensitive layer formed on a metallic support, comprising: A supporting means for supporting the support side of the photosensitive lithographic printing plate without supporting at least a part of the position corresponding to the side, and the support as it moves toward the end of the photosensitive lithographic printing plate supported by the supporting means. Pressing means for pressing an inclined surface inclined in a direction approaching the means to an end of a surface on the photosensitive layer side of the photosensitive lithographic printing plate supported by the support means, wherein: Plate edge processing device. 5. An end processing apparatus for a photosensitive lithographic printing plate according to claim 4, further comprising a moving means for relatively moving the photosensitive lithographic printing plate and the pressing means. 6. The photosensitive device according to claim 5, wherein the pressing unit has an upper roller having the inclined surface, and the upper roller rotates at a peripheral speed synchronized with a moving speed of the relative movement. End processing device for lithographic printing plates. 7. The photosensitive lithographic printing plate according to claim 6, wherein the supporting means is constituted by a lower roller, and the lower roller rotates at a peripheral speed synchronized with a moving speed of the relative movement. Edge processing equipment. 8. When viewed in a cross section of the photosensitive lithographic printing plate supported by the support means, the inclined surface extends over a portion where the support means supports the photosensitive lithographic printing plate and a portion which does not support the photosensitive lithographic printing plate. The photosensitive lithographic printing plate edge processing apparatus according to any one of claims 4 to 7, wherein the edge lithographic printing plate is provided with a lithographic printing plate. 9. The end processing apparatus for a photosensitive lithographic printing plate according to claim 4, wherein the support means has an uneven portion. 10. A photosensitive lithographic printing plate edge treatment method for treating an edge of a photosensitive lithographic printing plate having a photosensitive layer formed on a metallic support, comprising: From the layer side, the end of the photosensitive lithographic printing plate is pressed and crushed, and with the crushing, the end of the support-side surface of the photosensitive lithographic printing plate is formed to be convex. Edge processing method for photosensitive lithographic printing plates.