JP2003025536A - Stacking apparatus for lithographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower an upper end position of a gradient guide surface so as to make misalignment of distal end positions of multiple lithographic printing plates stacked on a stacking surface, and to prevent the distal ends of the printing plates from being inserted below a stopper member. SOLUTION: A limiting member 90 is interposed together with a cushioning material 72 between a support plate 62 and a protective sheet 74 at the stopper member 60 for limiting a movement of the lithographic printing plate 46 in a conveying direction F. The member 90 limits a flexible deformation of the sheet 74 at its lower side part from an upper end of the gradient guide surface 94 of the sheet 74 at the time of colliding with the plate 46 with the member 60. Thus, when the plate 46 is made to collid with the member 60, a part of the lower side from the upper end of the guide surface 94 of the sheet 74 is prevented from being locally excessively flexibly deformed by a load from the plate 46 and the distal end of the plate 46 is prevented from being inserted below the member 60.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lithographic printing plate for positioning a plurality of lithographic printing plates sequentially fed from a conveyor such as a belt conveyor at a predetermined stacking position and stacking these lithographic printing plates in layers. The present invention relates to a printing plate accumulating device.

[0002]

2. Description of the Related Art In a lithographic printing plate processing line, a lithographic printing plate that has been pasted with protective interleaving paper, cut into product sizes, etc., is transferred to the end of the processing line by a conveyor such as a belt conveyor or roller conveyor. The lithographic printing plate is conveyed to an installed collecting device (hereinafter simply referred to as “collecting device”). The stacking device is provided with, for example, a stacking surface that receives a plurality of planographic printing plates sequentially loaded from the transport device and stacks the planographic printing plates. Further, in the stacking device, in order to position the lithographic printing plate at a predetermined stacking position, a back stopper and a front stopper are respectively arranged on the downstream side and the upstream side of the lithographic printing plate on the stacking surface, and the width of the lithographic printing plate is further increased. A pair of side stoppers are arranged so as to sandwich the collecting surface from the outside along the direction.

Since the lithographic printing plate placed on the stacking surface moves in the carrying direction by the carrying device due to the inertial force, it collides with the back stopper and is restricted from moving in the carrying direction. It is returned in the direction (repulsion direction) opposite to the conveyance direction due to the reaction force at the time of collision with the back stopper. As a result, the lithographic printing plate on the stacking surface moves to a position where the rear end of the lithographic printing plate comes into contact with the front stopper and is positioned at a predetermined position along the transport direction. In addition, the pair of side stoppers are pre-adjusted so that the distance between them is slightly wider than the width of the planographic printing plate. By inserting the planographic printing plate between the pair of side stoppers, the planographic printing plate can be placed on the stacking surface. It is positioned at a predetermined position along the width direction of the printing plate. In this way, the lithographic printing plate is positioned along the carrying direction and the width direction, and is positioned at a predetermined stacking position on the stacking surface.

By the way, in the above-mentioned accumulating device, it is necessary to prevent the lithographic printing plate from being deformed (plastically deformed) due to the impact when the front end of the lithographic printing plate collides with the back stopper. For this reason, some stacking devices are provided with a structure (buffer structure) for buffering the impact at the time of collision between the lithographic printing plate and the back stopper. An example of an integrated device (hereinafter, simply referred to as "integrated device") is shown in FIG.

The stacking device 100 shown in FIG. 7 is provided with a stacking surface 104 on which the planographic printing plates 46 loaded from a conveyor (not shown) such as a belt conveyor are stacked. A lithographic printing plate 46 is provided on the downstream side of the stacking surface 104.
A back stopper 106 for limiting the movement of the sheet in the conveying direction (the direction of arrow F) is arranged, and the back stopper 106 is provided on the stacking surface 104.
The support plate 110 is supported so as to face the front end of the.

A support plate 110 made of a metal plate is provided at the downstream end of the stopper member 108, and a rod 112 is connected to the back surface side of the support plate 110. The support plate 110 is movably supported by a rod cylinder 114 via a rod 112 along the transport direction, and is supported by a coil spring 116 arranged on the outer peripheral side of the rod 112 in a direction of a front stopper (not shown) (repulsion direction). ). A cushion material 117 having flexibility such as urethane and sponge is attached to the surface side of the support plate 110, and the surface side of the cushion material 117 is covered with a thin protective sheet 118 made of metal.

In the stacking apparatus 100, when the planographic printing plate 46 put on the stacking surface 104 from the transporting device collides with the stopper member 108, the stopper member 108 is moved in the transporting direction by the inertial force of the planographic printing plate 46. By moving to
The impact force at the time of collision between the stopper member 108 and the planographic printing plate 46 can be relaxed. At the same time, the cushioning member 117 is elastically deformed by the inertial force of the planographic printing plate 46, so that the impact force acting on the planographic printing plate 46 can be dissipated. After this,
The back stopper 106 pushes the planographic printing plate 46 back to the front stopper (not shown) by the restoring force of the coil spring 116.

A back stopper 10 is provided on the collecting surface 104.
A guide member 120 having a wedge-shaped cross section is installed on the upstream side of the conveyance direction of the guide member 6.
0 is a slope-shaped inclined guide surface 122 whose upper surface is inclined upward toward the back stopper 106. Therefore, the lithographic printing plate 46 fed from the belt conveyor collides with the stopper member 108 of the back stopper 106 with the leading end portion thereof riding on the inclined guide surface 122. At this time, the inclined guide surface 122 guides the leading end of the lithographic printing plate 46 so as to collide with a portion above the lower end of the stopper member 108 by a predetermined distance, and the leading end of the lithographic printing plate 46 falls below the stopper member 108. Prevent it from being fitted to the side.

[0009]

However, in order to reliably prevent the leading end of the lithographic printing plate 46 from being fitted to the lower side of the stopper member 108, as shown in FIG. 8, a stopper at the upper end of the inclined guide surface 122 is provided. If the relative position with respect to the member 108 is sufficiently high, that is, if the thickness T (see FIG. 8) at the downstream end of the guide member 120 is sufficiently thick, a large number (for example, 100 or more) stacked on the stacking surface 104 will be obtained. There arises a problem that the leading end positions of the planographic printing plates 46 become uneven.

That is, as shown in FIG. 9, when a large number of planographic printing plates 46 are stacked on the stacking surface 104 and these planographic printing plates 46 are positioned with reference to the front stopper, the stacked planographic plates are stacked. Since much air remains near the center between the printing plates 46, the leading end portion of the planographic printing plates 46 accumulated on the lower side has the inclined guide surface 122.
The lithographic printing plates 46, which are bent so as to have a larger inclination along the upper side and are accumulated upward, have a smaller inclination at the leading end. As a result, in a bundle of a large number of planographic printing plates 46 accumulated on the accumulation surface 104 (this is referred to as an “accumulation bundle”) 48,
The lower lithographic printing plate 46 has its tip and the stopper member 10
8 becomes wider along the transport direction, and the upper lithographic printing plate 46 becomes narrower between the leading end thereof and the stopper member 108.

On the other hand, in order to sufficiently reduce the unevenness in the stack bundle 48 stacked on the stacking surface 104, as shown in FIG. 7, if the thickness T of the inclined guide surface 122 is made thin, the planographic printing plate 46 is reduced. The tip of the stopper member 108
It will collide with a part near the bottom edge. At this time, a large inertial force (load) acts on the stopper member 108 from the lithographic printing plate 46, and the cushion material 11 of the stopper member 108.
7 and only the lower end side of the protective sheet 118 is largely elastically deformed locally, the front end portion of the planographic printing plate 46 is moved along the lower end side of the protective sheet which is largely flexibly deformed.
There is a possibility that a trouble of fitting into the lower side of 8 may occur.

In view of the above facts, an object of the present invention is to sufficiently reduce the unevenness of the leading end positions of a large number of lithographic printing plates stacked on the stacking surface, so that the stopper member at the upper end position of the inclined guide surface is sufficiently small. It is an object of the present invention to provide a lithographic printing plate accumulating device in which the front end of the lithographic printing plate is prevented from being fitted into the lower side of the stopper member while lowering the height.

[0013]

According to the lithographic printing plate stacking apparatus of the present invention, a back stopper member for protecting the lithographic printing plate loaded on the stacking surface from the carrying device in the carrying direction and protection. A limiting member is interposed between the sheet and the cushioning member, and the limiting member limits the flexural deformation at a portion below the upper end of the inclined guide surface in the protective sheet, so that the lithographic printing plate moves in the transport direction. When the tip portion rides on the inclined guide surface and collides with the back stopper member through the protective sheet and the cushion material, the portion of the protective sheet below the upper end of the inclined guide surface is affected by the load from the planographic printing plate. Since it is possible to prevent locally excessive flexural deformation, even if the load acting on the stopper member from the lithographic printing plate is large, the tip of the lithographic printing plate is a protective sheet. It is possible to prevent the fitted to the lower side of the stopper member along the lower portion of the upper end of the definitive inclined guide surface.

Here, as a material for the cushion material, a sponge-like (multi-pore) elastic material such as polyurethane foam or polyethylene foam is particularly suitable because it has a high shock absorbing capacity. Further, the limiting member needs to be formed of a material having higher rigidity than the cushion material.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A planographic printing plate accumulating apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

(Structure of Embodiment) First, a planographic printing plate processing line 10 using the planographic printing plate accumulating apparatus according to the embodiment of the present invention shown in FIGS. 1 and 2 will be described. As shown in FIG. 1, a web feeder 14 is disposed on the upstream side (upper right side in FIG. 1) of the processing line 10, and the web feeder 14 is provided with a web 12 which is a material of the planographic printing plate. The web roll 13 on which is wound is loaded. The web feeder 14 continuously feeds the web 12 from the web roll 13 to the downstream side at a speed corresponding to the line speed of the processing line 10. This web 12
The curl is corrected by the leveler 16 and then reaches the pressure roller 18. The pressure-bonding roller 18 pressure-bonds the strip-shaped interleaf paper 22 sent from the interleaf paper feeder 20 to the upper surface (surface of the photosensitive layer) of the web 12. At this time, the interleaf paper 22 pressed onto the web 12 is charged by a charging device (not shown) and electrostatically adhered to the web 12.

The notcher 2 is provided downstream of the pressure roller 18.
4 are arranged. This notcher 24
When the slit width of 2 is changed, the central portion and both side edges of the web 12 along the width direction are punched out, and notches having a predetermined shape are formed in the central portion and both side edges of the web 12, respectively. . As a result, the shear blades 28 (see FIG. 2) of the slitter device 26 provided so as to correspond respectively to the central portion and both side end portions of the web 12 are movable in the axial direction within the cutout portion, so that The width of the web 12 can be changed while continuously cutting the interleaving paper 22 at the same time.

The length of the web 12 cut into a predetermined slit width by the slitter device 26 is counted by the length measuring device 30, and when the preset count value is counted by the length measuring device 30, the web 12 is synchronized with it. Is cut along the width direction of the web 12 by the running cutter 32.
As a result, the lithographic printing plate 4 of the preset product size
6 is manufactured. The lithographic printing plate 46 cut from the web 12 is stacked on a conveying device 38 composed of a plurality of belt conveyors 34, 35, 36 as shown in FIG. 2, and is conveyed to the downstream side by the conveying device 38. Then, it is loaded into the stacking device 50 by the belt conveyor 36 arranged at the end of the transport device 38.

As shown in FIG. 1, the slitter device 26 divides the web 12 into two parts in the width direction.
When the two lithographic printing plates 46 are cut at the same time by the running cutter 32, the two lithographic printing plates 46 cut at the same time are different from each other by a sorting gate or the like while being conveyed to the stacking device 50. The sheets are distributed on the belt conveyors 35 of the table, and are respectively loaded into the two accumulating devices 50 (see FIG. 2) installed at different positions by these belt conveyors 35.

A distribution gate 40 for switching the destination of the planographic printing plate 46 is provided between the belt conveyor 34 and the belt conveyor 36, and the planographic printing plate 46 cut from the web 12 is used as a sample. In the case of a defective product or defective product, the planographic printing plate 46 is distributed to the line-out belt conveyor 35 by the distribution gate 40.
This belt conveyor 35 puts it into the collection box 44.

3 and 4 show a stacking device 50 for the planographic printing plate 46 according to the embodiment of the present invention. The stacking device 50 stacks the lithographic printing plates 46 sequentially loaded from the end of the belt conveyor 36 in a predetermined stacking position and stacks them in layers, whereby a large number of sheets (for example, 100 or more) are stacked.
The stack bundle 48 is composed of the lithographic printing plate 46. The accumulating device 50 is provided with a flat accumulating table 52 on the downstream side of the belt conveyor 36 in the conveying direction (direction of arrow F). The upper surface of the stacking table 52 is a flat stacking surface 54 on which the planographic printing plates 46 are stacked. The stacking table 52 is placed on the floor via a frame or the like so that the stacking surface 54 is substantially horizontal. It is supported.

As shown in FIG. 3, a pair of back stoppers 58 are arranged on the stacking surface 54 downstream of the stacking position where the planographic printing plates 46 are stacked in the transport direction.
Each of the pair of back stoppers 58 is provided with a thick plate-shaped stopper member 60 so as to face the leading end surface of the planographic printing plate 46 stacked on the stacking surface 54.
The stopper member 60 is supported so that its thickness direction is substantially parallel to the transport direction.

As shown in FIGS. 3 and 4, the stopper member 60 is provided with a support plate 62 made of a metal plate at the base end portion on the downstream side in the carrying direction, and the back surface side of the support plate 62. A round rod-shaped rod 64 is connected and fixed by welding or the like. The rod 64 is supported by a rod cylinder 66 installed on the stacking surface 54 so as to be slidable along the transport direction. A pair of bearings 68 (see FIG. 5) is housed in the rod cylinder 66, and these bearings 68 hold the rod 64 so that it can slide with a sufficiently small resistance. In addition, the stopper member 60
Is supported by a rod cylinder 66 such that its lower end surface is located slightly above the level of the collecting surface 54.

The rod cylinder 66 is arranged on the collecting surface 54 via a slide plate 69.
9 is a stacking table 5 so that it can move along the transport direction.
It is connected to 2. As a result, the back stopper 58
The position of the plate can be adjusted according to the dimension (length) of the planographic printing plate 46 along the carrying direction.
A coil spring 70 in a compressed state is fitted and inserted on the outer peripheral side of the rod 64, and the coil spring 70 conveys the stopper member 60 movably supported along the conveyance direction via the rod 64. Direction is urged to the upstream side.

As shown in FIG. 5, the support plate 62
A cushion material 72 having flexibility is attached to the surface side of the sheet, and the surface side of the cushion material 72 is covered with a protective sheet 74 formed in a thin plate shape. Here, the cushion material 72 is formed of a sponge-like elastic material such as polyurethane foam or polyethylene foam. The cushion member 72 has a dimension (vertical width) along the height direction (direction of arrow H) of the support plate 6.
It is made shorter than the vertical width of 2 by a predetermined length. On the other hand, the protective sheet 74 is formed so that its horizontal width and vertical width are equal to the horizontal width and vertical width of the support plate 62. As a result, between the lower end portion of the support plate 62 and the lower end portion of the protective sheet 74, a space having no cushion material 72 and having a width equal to the thickness of the cushion material 72 is formed.

As shown in FIG. 5, the support plate 62
A restriction member 90 having a substantially trapezoidal cross section along the transport direction is fixed to the lower end of the front surface. The restricting member 90 has sufficiently higher rigidity than the cushioning material 72 made of an elastic material and has a higher vibration absorbing property than metal (for example, trade name "New Light (Shinshin Kogyo)"), nylon resin. (For example, a product name “MC nylon (Nippon Polypenco)”) and the like are molded. The size (thickness) of the limiting member 90 along the carrying direction is shorter than the thickness of the cushion material 72 by a predetermined length. Specifically, the restricting member 90 is formed to be thinner than the thickness of the cushioning material 72 in the free state by about 5 mm, and the space between the front end surface of the restricting member 90 and the back surface of the protective sheet 74 along the carrying direction. As a result, a gap D (see FIG. 4) having a width corresponding to the difference in thickness between the limiting member 90 and the cushion material 72 is formed.

As shown in FIG. 5, on the stacking surface 54, a guide member 92 having a wedge-shaped cross section is formed at a minute interval upstream of the back stopper 58 in the transport direction.
Is installed. The guide member 92 has a slope-shaped inclined guide surface 94 whose upper surface is inclined upward toward the back stopper 58.
The upper end position of 4 substantially coincides with the lower end position of the cushion member 72 along the height direction. Therefore, the belt conveyor 3
The lithographic printing plate 46 loaded from No. 4 has the back stopper 58 in a state where the leading end portion of the lithographic printing plate 46 rides on the inclined guide surface 94.
Collides with the stopper member 60. At this time, the inclined guide surface 94 guides the leading end of the planographic printing plate 46 along the height direction so as to collide with a portion of the stopper member 60 corresponding to the lower end of the cushion material 72.

As shown in FIG. 3, in the stacking device 50, side stoppers 76 are provided outside the both side ends of the stacking table 52 along the width direction (direction of arrow W) of the planographic printing plate 46.
Is provided. The side stopper 76 is formed in a substantially rectangular thick plate shape whose longitudinal direction is the transport direction,
It is arranged so that the thickness direction thereof coincides with the width direction (arrow W direction) of the stacking table 52. This side stopper 76
A guide surface 78 that is curved so as to incline downward inward in the width direction is formed at the upper end of the inner surface of the
On the lower side of the guide surface 78, a planar positioning surface 80 that stands upright in the vertical direction is continuously formed. The pair of side stoppers 76 are movable along the width direction. As a result, the pair of side stoppers 7
The spacing of the positioning surfaces 80 in 6 can be adjusted according to the width of the planographic printing plate 46 stacked on the stacking table 52.

As shown in FIG. 3, the stacking device 50 includes a front stopper 8 on the upstream side of the stacking table 52 in the conveying direction.
2 are provided. The front stopper 82 has a substantially rectangular shape and a thick plate shape.
Is arranged so that the longitudinal direction thereof coincides with the width direction. On the inner surface of the front stopper 82, a guide surface 84 that is curved so as to incline downward toward the downstream side is formed at the upper end portion thereof, and on the lower side of the guide surface 84, the guide surface 84 is erected vertically. The planar positioning surface 86 is continuously formed.

As shown in FIG. 3, the front stopper 82 has a plurality of slit-shaped nozzle holes 88 elongated in the width direction at the upper end of the positioning surface 86. The nozzle holes 88 extend in the horizontal direction. Are arranged. Air pipes (not shown) for supplying high-pressure air to the plurality of nozzle holes 88 are passed through the front stopper 82, and when the planographic printing plates 46 are accumulated by the accumulating device 50, the air holes are discharged from the plurality of nozzle holes 88. The high-pressure air is jetted so as to direct the respective conveying directions. As a result, immediately after loading from the belt conveyor 36, an air layer is formed between the planographic printing plate 46 and the stacking surface 54 or between the planographic printing plates 46, and moves (slides) on the stacking surface 54 due to inertial force or the like. The movement resistance of the planographic printing plate 46 is suppressed.

(Operation of Embodiment) Next, the operation and operation of the integrated device 50 configured as described above will be described.

First, the planographic printing plate 46 is used as the belt conveyor 3.
When the planographic printing plate 46 is loaded onto the stacking device 50 by 6, the lithographic printing plate 46 continues to move in the transport direction due to inertial force,
It is placed on the collecting surface 54. At this time, since high-pressure air is being jetted from the nozzle holes 88 of the front stopper 82, an air layer is formed along the lower surface of the planographic printing plate 46 that is thrown in by the belt conveyor 36. This air layer suppresses the frictional resistance between the planographic printing plate 46 put on the collecting surface 54 and the collecting surface 54 or the planographic printing plate 46 that has already been collected, and the planographic printing plate 46 on the collecting surface 54 is smoothly conveyed. Move in the direction.

Further, the planographic printing plate 46 is the belt conveyor 3
When the sheet is loaded onto the stacking surface 54 from above 6, the lower surface side of the lithographic printing plate 46 contacts the vicinity of the upper end portion of the front stopper 82 depending on the conveying speed of the belt conveyor 36 and the length and thickness of the lithographic printing plate 46. Sometimes. Even in such a case, since the guide surface 84 is formed on the upper end portion of the front stopper 82, the planographic printing plate 46 is caught by the front stopper 82, or the lower surface of the planographic printing plate 46 contacts the front stopper 82. Are prevented from being damaged.

The planographic printing plate 46 put on the stacking surface 54 from the belt conveyor 36 continues to move in the conveying direction due to the inertial force, and the leading end portion thereof rides on the inclined guide surface 94 and the back stopper. 58 stopper member 60
Clash with. At this time, the stopper member 60 receives an inertial force (load) from the planographic printing plate 46 corresponding to its weight and speed.
Since the coil spring 70 is moved in the carrying direction while being compressed and deformed, the cushion material 72 is received.
Is compressed and deformed between the protective sheet 74 and the support plate 62. Thereby, the kinetic energy of the planographic printing plate 46 is dissipated by both the coil spring 70 and the cushion material 72, and the impact load acting as a reaction force from the back stopper 58 to the planographic printing plate 46 is reduced.

Further, as shown in FIG. 5, the lithographic printing plate 4
In No. 6, the tip end side is on the inclined guide surface 94 of the guide member 92 and collides with the stopper member 60.
As a result, the leading end of the planographic printing plate 46 is guided upward along the inclined guide surface 94, and collides with the lower end of the stopper member 60 to the upper portion corresponding to the thickness T of the guide member 92. At this time, the limiting member 90 of the stopper member 60 comes into contact with the lower end portion of the protective sheet 74 from the back surface side when the vicinity of the lower end portion of the cushion member 72 is compressed and deformed by the width of the gap D between the limiting member 90 and the protective sheet 74 or more. The bending deformation of the lower end portion of the protective sheet 74 is restricted so as not to increase any further. At the lower end portion of the protective sheet 74 which receives the load from the planographic printing plate 46, the intersecting angle between the surface and the stacking surface 54 is approximately 90 ° (see FIG. 5), and the planographic printing plate 46 is
Even if the load from the above is large, the bending deformation is limited by the limiting member 90 so that the intersecting angle does not become smaller than 90 °.

When the movement of the planographic printing plate 46 due to the inertial force stops after the collision with the stopper member 60, the stopper member 60 pushes the planographic printing plate 46 back to the front stopper 82 side by the restoring force of the coil spring 70. As a result, the planographic printing plate 46 moves to a position where the rear end of the planographic printing plate 46 contacts the positioning surface 86 of the front stopper 82. As a result, the planographic printing plate 46 is positioned at a position based on the positioning surface 86 of the front stopper 82 along the transport direction.

On the other hand, the lithographic printing plate 46 is placed between the pair of side stoppers 76 from the belt conveyor 34 so that it is positioned at the center position between the pair of side stoppers 76 even in the width direction. Therefore, the belt conveyor 34
The lithographic printing plates 46 sequentially loaded from are positioned at a predetermined stacking position on the stacking surface 54, and are stacked in layers at this stacking position. When the number of lithographic printing plates 46 on the stacking surface 54 reaches the number of stacks defined in the shipping specifications and the like, and the stacking bundle 48 is formed, the stacking bundle 48 is transferred from the stacking device 50 to a pallet (not shown) or the like. It is then transported to the packaging / packing process and storage warehouse.

The integrated device 5 according to the present embodiment described above
According to 0, the support plate 6 in the stopper member 60 that restricts the movement of the lithographic printing plate 46, which is put on the stacking surface 54 from the belt conveyor 34, in the transport direction due to the inertial force.
By restricting the cushion member 72 and the restricting member 90 between the protective sheet 74 and the protective sheet 74, the restricting member 90 restricts the bending deformation of the protective sheet 74 at a portion below the upper end of the inclined guide surface 94. When the front end of the lithographic printing plate 46 moving in the transport direction rides on the inclined guide surface 94 and collides with the stopper member 60 of the back stopper 58, a load from the lithographic printing plate 46 causes the inclined guide in the protective sheet 74. Since it is possible to prevent the portion below the upper end of the surface 94 from locally bending and deforming excessively, even if the load acting from the lithographic printing plate 46 to the stopper member 60 is large, the leading end of the lithographic printing plate 46 is a protective sheet. 7
It is possible to prevent the stopper member 60 from being fitted to the lower side of the inclined guide surface 94 along the portion below the upper end of the inclined guide surface 94.

Next, the shape and size of the guide member 92 installed on the stacking surface 54 will be specifically described.

As shown in FIG. 6, the length L _B of the bottom portion of the guide member 92 installed on the stacking surface 54 along the transport direction is set to a constant value of 175 mm, and the thickness T of the guide member 92 is set. The length L _H of the inclined guide surface 94 was changed stepwise as shown in the following (Table 1). here,
On the stacking surface 54, a large number of planographic printing plates 46 were stacked such that the entire part including the top part of the planographic printing plate 46 located at the uppermost part of the stack 48 was in a horizontal state within an error range. At this time, as the lithographic printing plate XX, an aluminum plate having a thickness of 0.2 (mm) as a support was used. Further, the lithographic printing plate 46 that constitutes the stacking bundle 48 is positioned in the transport direction so that its rear end contacts the positioning surface 86 of the front stopper 82. In addition, in the stacking device 50 shown in FIG. 6, the bottom surface of the guide member 92 and the stacking surface 54.
The clearance between and is adjustable by a spacer or the like, and this clearance is adjusted to be 1 (mm). Therefore, the substantial height from the collecting surface 54 to the upper end of the inclined guide surface 94 is the thickness T + 1 (mm) of the guide member 92.

[0041]

[Table 1] In the above (Table 1), the clearance gap C _G is the clearance between the lowermost lithographic printing plate 46 and the protective sheet 74 along the transport direction C _B , and the clearance between the uppermost lithographic printing plate 46 and the protective sheet 74. Is C _T , (C _B
It is a value calculated by −C _T ), and shows the variation in the position along the transport direction between the planographic printing plates 46 in the stack bundle 48. When the clearance gap C _G exceeds the reference value set in the shipping specification of the product, the accumulated bundle 4
No. 8 must be removed from the normal product processing route and manually re-assembled so that the clearance gap C _G is below the reference value. As shown in (Table 1),
If the thickness T of the guide member 92 is set to 9 (mm) or less, the clearance gap CG is set to 0.23 (mm) or less, so that the reference value can be cleared and the stacking unit 48 can be manually reassembled surely. It can be unnecessary.

Further, in the integrated device 50 according to this embodiment,
The thickness T of the guide member 92 shown in Table 1 is “7 mm to 1
Within the range of “8 mm”, the planographic printing plate 46 did not fit under the stopper member 60. On the other hand, FIG.
In the conventional stacking device 50 shown in FIG. 9, when the thickness T of the guide member 92 is set to 18 mm or less, the planographic printing plate 46 is
Occasionally, a trouble that the tip end of the stab fits in the lower side of the stopper member 108.

[0043]

As described above, according to the lithographic printing plate stacking apparatus of the present invention, in order to sufficiently reduce the misalignment of the leading end positions of a large number of lithographic printing plates stacked on the stacking surface, the inclination Even if the upper end position of the guide surface is lowered, it is possible to prevent the leading end of the planographic printing plate from being fitted into the lower side of the stopper member.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of a processing line in which a lithographic printing plate stacking apparatus according to an embodiment of the present invention is arranged.

FIG. 2 is a side view showing a schematic configuration of a processing line in which a planographic printing plate accumulating device according to an embodiment of the present invention is arranged.

FIG. 3 is a perspective view showing a configuration of a lithographic printing plate stacking apparatus according to an embodiment of the present invention.

FIG. 4 is a side view showing the configuration of a lithographic printing plate stacking apparatus according to an embodiment of the present invention.

5 is a side view showing a state immediately after the planographic printing plate has collided with the stopper member in the planographic printing plate accumulating device shown in FIG. 4. FIG.

FIG. 6 is a side view showing a state in which a stack of a large number of planographic printing plates is formed on a stacking surface of the planographic printing plate stacking apparatus shown in FIG.

FIG. 7 is a side view showing a conventional lithographic printing plate stacking device, showing a state immediately after the lithographic printing plate has collided with the stopper member when the guide member is sufficiently thick.

FIG. 8 is a side view showing a conventional lithographic printing plate stacking device, showing a state immediately after the lithographic printing plate has collided with a stopper member when the guide member is thin.

9 is a side view showing a state in which a stack of a large number of planographic printing plates is formed on a stacking surface of the planographic printing plate stacking apparatus shown in FIG. 7. FIG.

[Explanation of symbols]

34 Belt conveyor (conveying means) 35 Belt conveyor (conveying means) 36 Belt conveyor (conveying means) 38 Conveyor 46 lithographic printing plate 48 stacks 50 integrated device 52 Stacking stand 54 Collection surface 58 Back stopper 60 Stopper member (back stopper member) 64 rod (supporting means) 66 rod cylinder (supporting means) 70 Coil spring (elastic member) 72 Cushion material 74 Protective sheet 82 Front stopper (front stopper) 90 Restriction member 92 Guide member 94 Inclined guide surface

Claims (2)

[Claims] 1. A lithographic printing plate stacking device for positioning a plurality of lithographic printing plate plates sequentially fed from a transporting device for transporting lithographic printing plate plates at a predetermined stacking position and stacking these lithographic printing plate plates in layers. An apparatus, which is provided on a downstream side of the planographic printing plate on the stacking surface, along a stacking surface on which the planographic printing plates input from the transporting device are stacked, and in a transporting direction of the planographic printing plate by the transporting device. A back stopper member for restricting movement of the planographic printing plate moving on the stacking surface in the conveying direction; and a back stopper member attached to the back stopper member so as to be interposed between the back stopper member and the leading end portion of the planographic printing plate. A cushion material that elastically deforms when it collides with a lithographic printing plate that moves in a direction, and a surface of the cushion material that faces the tip of the lithographic printing plate is covered, and a lithographic printing plate that moves in the transport direction; A protective sheet that flexibly deforms according to the elastic deformation of the cushion material at the time of collision, and a lithographic printing plate provided on the upstream side of the lithographic printing plate on the stacking surface along the transport direction and the movement of which is limited by the back stopper member. A front stopper that restricts the movement of the plate in a repulsive direction opposite to the transport direction and positions the planographic printing plate at a predetermined stacking position along the transport direction, and is provided at a downstream end of the stacking surface. A sloped guide surface that slopes upward toward the back stopper and on which the front end portion of the planographic printing plate, whose movement in the transport direction is restricted by the back stopper member, rides on the back stopper member and the protective sheet. Is interposed between the cushioning member and the cushioning member to limit flexural deformation of the protective sheet at a portion below the upper end of the inclined guide surface. A lithographic printing plate accumulating device, comprising: 2. Support means for movably supporting the back stopper member along the carrying direction, and elastic deformation of the back stopper member as the back stopper member moves in the carrying direction due to a load from a planographic printing plate. The planographic printing plate accumulating apparatus according to claim 1, further comprising: an elastic member that applies a restoring force toward the repulsive direction to the stopper member.