JP4637611B2 - Planographic printing plate feeder - Google Patents

Description

  The present invention relates to a lithographic printing plate supply device, and more specifically, a lithographic plate capable of supplying lithographic printing plates one by one from a laminated bundle in which a laminated set composed of a lithographic printing plate and a slip sheet is laminated. The present invention relates to a printing plate supply apparatus.

  In general, a lithographic printing plate is composed of a laminated set in which a protective slip sheet is adhered to the image recording surface, and a plurality of the laminated sets are laminated in the thickness direction to form a lithographic printing plate bundle. There are many. When an image is recorded on the lithographic printing plate by an exposure device or the like, it is necessary to take out the lithographic printing plates one by one from the plate bundle and supply them to the exposure device.

  For example, in the image recording material sheet-fed device described in Patent Document 1, printing plates and slip sheets are accommodated alternately in a cassette of a sheet transport unit, and a suction cup is inserted on the slip sheet. The printing plate is sucked up and lifted out of the cassette. After being taken out, the slip sheet is separated from the printing plate sucked by the fan. However, in this configuration, since the suction cup is used to supply the printing plate, the configuration becomes complicated and the cost may increase.

On the other hand, Patent Document 2 describes a configuration in which a slip sheet on the end face in the stacking direction is sent out by a roller, and a planographic printing plate is sent out by a vacuum pad. However, in this configuration, in order to take out the lithographic printing plates or slip sheets one by one, when the slip sheet is located on the end surface in the stacking direction, the next lithographic printing plate is taken out only after the slip sheet is taken out. Can not be supplied and takes time to supply. In addition, since a separate take-out mechanism is required for the lithographic printing plate and the slip sheet, the number of parts increases, which may lead to an increase in the size and cost of the apparatus.
JP 2003-182904 A Japanese Patent Laid-Open No. 60-202028

  In view of the above facts, an object of the present invention is to obtain a planographic printing plate supply device that can supply a planographic printing plate quickly and reliably with a small, simple, and low-cost configuration.

In the invention described in claim 1, a laminated bundle composed of lithographic printing plates and interleaf sheets is laminated from the back surface of the lithographic printing plate in the end area layer set of the end faces in the lamination direction with respect to the laminated bundle laminated in the thickness direction. The end area layer is formed by applying a load in a range in which the conveying force acting on the paper is greater than the maximum static frictional force between the interleaf and the photosensitive layer of the laminated set of the next layer to the planographic printing plate of the end area layer set. It comprises transport means capable of transporting the set, and a separating device for separating the planographic printing plate and the slip sheet from the stacked set transported by the transport means.

That is, in this planographic printing plate supply device, the load applied to the end area layer set is adjusted by the transport means, and the transport force acting on the slip sheet from the back surface of the planographic printing plate in the end area layer set is adjusted to this slip sheet. And a load in a range larger than the maximum static frictional force between the photosensitive layer of the layer set of the next layer is applied to the planographic printing plate of the end area layer set. Therefore, when a conveying force is applied to the planographic printing plate of the end area layer set by the conveying means, the end area layer set is sent out, but the next layer stacked set is prevented from being sent out together with the end area layer set.

  The single laminated set (one lithographic printing plate and one slip sheet are in close contact with each other) is separated into the lithographic printing plate and slip sheet by a separation device.

  As described above, in the present invention, since it is possible to take out and transport at least a laminated set as a unit from a laminated bundle, the next lithographic printing plate can be quickly taken out and supplied. Since it is not necessary to separately provide a mechanism for taking out the lithographic printing plate and the interleaf, and it is not necessary to use a suction cup or the like for taking out, the structure is small, simple and low cost.

  Further, by further adjusting the load from the conveying means to the end area layer set, it is possible to take out the lithographic printing plate or slip sheet alone or to take out a plurality of laminated sets at the same time.

  According to a second aspect of the present invention, in the first aspect of the present invention, the conveying means includes a conveying roller that applies a conveying force by rotating while contacting the end area layer set. It is characterized by that.

  Thereby, the structure of a conveyance means can be simplified.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the separating device includes a forward roller that contacts the interleaving slip sheet and rotates in the same direction as the transport direction, And a reverse rotation roller that contacts the slip sheet downstream of the transfer roller and rotates relative to the reverse direction of the transfer direction than the forward rotation roller.

  Therefore, the slip sheet adsorbed on the planographic printing plate is sent in the transport direction by the forward rotation roller in the middle of the transport, but on the downstream side, a force in the direction opposite to the transport direction acts by the reverse rotation roller. As a result, sagging occurs in the slip sheet between the forward roller and the reverse roller, so that the slip sheet can be separated from the planographic printing plate.

  In order to generate the above-mentioned sag, it is sufficient that the reverse rotation roller is reversely rotated with respect to the forward rotation roller by a relative speed difference in the direction opposite to the conveying direction. For example, when the reverse rotation roller is viewed alone, it may be forward rotating or may be reverse rotation (the peripheral speed of rotation is slower than that of the forward roller) in relation to the forward roller.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the reverse rotation roller is movable between a contact position that contacts the slip sheet and a separation position that is spaced from the slip sheet. Features.

  The reverse rotation roller is set to the contact position only when the slip sheet needs to be separated, and when it is not necessary, the reverse rotation roller is set to the separation position, thereby preventing inadvertent contact of the reverse rotation roller with the planographic printing plate.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the separating device includes a suction device that sucks and separates the slip sheet from the planographic printing plate. It is configured.

  Therefore, the slip sheet adsorbed on the lithographic printing plate can be separated from the lithographic printing plate simply by sucking with a suction device.

  In the invention of claim 6, in the invention of any one of claims 1 to 5, it is possible to detect the presence or absence of a lithographic printing plate and a slip sheet on the upstream side in the transport direction from the separating device. A detection sensor is provided.

  In the lithographic printing plate supply apparatus according to any one of claims 1 to 5, in addition to a laminated group (a lithographic printing plate and a slip sheet are grouped together one by one), a lithographic printing plate, It is also possible to take out the interleaving paper alone. Further, it is possible to make none of these transports by stopping the transport means or the like. In the invention described in claim 6, since these four states are detected by the detection sensor, the separation device can be controlled in accordance with each state.

  Since the present invention has the above-described configuration, a planographic printing plate can be rapidly supplied one by one with a small, simple and low-cost configuration.

  FIG. 1 shows the overall configuration of a planographic printing plate supply apparatus 12 according to the first embodiment of the present invention. In FIG. 2, the placement unit 14 and the delivery unit 16 of the planographic printing plate supply device 12 are shown in a state in which the plate bundle 18 is placed on the placement unit 14.

  In the planographic printing plate, a photosensitive agent is applied to one surface of a support formed in a plate shape with aluminum or the like to form a photosensitive agent surface 20E. As shown in FIG. 4, the photosensitive agent surface 20E is protected. A plate bundle 18 is formed by alternately stacking paper 22 and planographic printing plates 20. In the state shown in FIG. 4, the photosensitive agent surface 20E is laminated so that it faces upward, and the slip sheet 22 that protects the photosensitive agent surface 20E of the uppermost lithographic printing plate 20 has already been removed. . In the following, a set composed of the lithographic printing plate 20 and the lower interleaf paper 22 in this state is a unit of conveyance in “multiple feeding” described later.

  4A to 4C show three modes of the lithographic printing plate 20 or the slip sheet 22 taken out by the lithographic printing plate supply device 12. 4A shows a mode in which the uppermost laminated set 24A, that is, the uppermost planographic printing plate 20A and the lower interleaf paper 22A are taken out as one set from the plate bundle 18, and this is hereinafter referred to as “multifeed”. " In FIG. 4B, the interleaf 22 is not taken out and only one lithographic printing plate 20 is taken out. This is hereinafter referred to as “single feeding”. The “single feed” includes a mode in which only the slip sheet 22 is taken out when the slip sheet 22 is positioned at the top. FIG. 4C shows a mode in which a plurality of the stacked sets 24 are taken out in a stacked state, and this is hereinafter referred to as “multiplex transmission”. In this embodiment, as will be described later, by adjusting the load W acting on the plate bundle 18 from the pickup roller 42, multiple feeding can be prevented and at least reliable double feeding can be performed (preferably double feeding and single feeding are performed). It can be switched arbitrarily). The feeding direction of the lithographic printing plate 20 is indicated by an arrow F, and the direction orthogonal to this (the width direction of the lithographic printing plate 20) is indicated by an arrow W.

  The planographic printing plate supply device 12 includes a base 26, and the placement unit 14 and the delivery unit 16 are disposed on the base 26. A caster 28 is attached to the base portion 26, and the entire lithographic printing plate supply device 12 can be moved and attached to, for example, the lithographic printing plate insertion portion of the exposure device.

  As shown in FIG. 2, the mounting portion 14 has a flat rectangular mounting tray 30, and in the mounting tray 30, there are two side end guide plates 32 and one rear end guide plate. 34 is arranged. The side end guide plate 32 slides in the direction of arrow W by a slide mechanism (not shown), and aligns the plate bundle 18, that is, the side surfaces of the plurality of stacked sets 24 according to the size of the planographic printing plate 20. Similarly, the rear end guide plate 34 is also slid in the direction of arrow F (and the opposite direction) by a slide mechanism (not shown) to align the rear end of the plate bundle 18 (a plurality of stacked sets 24).

  The placement unit 14 is provided with a plurality of covers 36 so as to cover the periphery of the placed plate bundle 18. The cover 36A that covers the downstream end of the plate bundle 18 in the conveying direction is pressed upward by a pressing member (not shown) when mounted on an exposure apparatus or the like, and rotates about a hinge 38 as shown in FIG. And it is supposed to jump up.

  A holder 40 is stretched over the mounting portion 14 along the width direction of the planographic printing plate 20. A pickup roller 42 is rotatably attached to the holder 40 so as to be positioned above the plate bundle 18 placed on the placement portion 14, and the driving force of the drive motor 44 is transmitted via the endless belt 46. It acts and rotates (forward rotation) in the direction in which the planographic printing plate 20 (or the interleaf paper 22) is conveyed.

  The holder 40 can be rotated around a support shaft 48 provided at both ends in the width direction and on the downstream side in the transport direction. A conveying position where the pickup roller 42 contacts the plate bundle 18 by applying a predetermined load W with a rotational driving force from the drive unit 50 provided on the side of the holder 40, and a separation position separated from the plate bundle 18 Rotate between.

Here, as shown in FIG. 5B, the conveying force acting on the uppermost lithographic printing plate 20A from the pickup roller 42 is F0, and from the back surface 20B of the lithographic printing plate 20 (the surface on which no photosensitive agent is applied). The conveying force acting on the slip sheet 22 is F1, the maximum static friction force between the back surface 20B and the slip sheet 22 is F1 ′, the maximum static friction coefficient is μ1, and the planographic printing plate 20 below the slip sheet 22 is below it. Generally, when the conveying force acting on the photosensitive agent surface 20E is F2, the maximum static frictional force between the interleaf 22 and the photosensitive agent surface 20E is F2 ′, and the friction coefficient thereof is μ2,
μ1 <μ2
And
F1 '<F2'
There is a relationship. Therefore, as can be seen from the graph of FIG. 5A, when the load W is gradually increased from 0, the planographic printing plate 20 cannot be transported at the initial stage because the transport force F0 is small (transport NG). However, when the load W exceeds the conveyance boundary, the conveyance force F0 acting on the uppermost lithographic printing plate 20 becomes larger than the maximum static frictional force F1 ′ between the back surface 20B and the interleaf paper 22, and the uppermost lithographic plate. The printing plate 20 can be conveyed. At this time, the conveying force F1 acting on the interleaf 22 from the back surface 20B of the planographic printing plate 20 is F1 ′ <F1 <F2 ′.
When it is in the range satisfying, only the uppermost planographic printing plate 20A is conveyed (single feed). That is, since the conveying force F1 acting on the slip sheet 22 is smaller than the maximum static frictional force F2 ′ between the lower surface of the slip sheet 22 and the photosensitive surface 22E of the next lithographic printing plate 20, the slip sheet is not transported.

When the load W is further increased to exceed the single feed boundary, the conveying force F1 acting on the interleaf paper 22 is
F2 '<F1
The uppermost planographic printing plate 20A and the interleaf 22A can be integrally conveyed (multi-feed). Therefore, by appropriately adjusting the load W so as to satisfy the above relationship, in the present embodiment, the single feed and the double feed can be arbitrarily switched and conveyed.

Further, when the interleaf paper 22A is positioned at the top of the plate bundle 18 instead of the planographic printing plate 20A,
F2 '<F1
If the load W is set so as to satisfy the condition, only the slip sheet 22A can be single-fed.

  When the load W is further increased and the multiple feeding boundary is exceeded in the graph of FIG. 5A, the conveying force F2 acting on the lower planographic printing plate 20 from the uppermost interleaf 22A is the maximum of these. It becomes larger than the static frictional force F2 ′, and multiplex feeding is performed. Therefore, in the present embodiment, the upper limit of the load W is limited to such an extent that multiple feeding does not occur.

  The bottom of the mounting tray 30 is a mounting plate 52 that is swung by a hinge (not shown) provided on the upstream side in the transport direction. In a state where the plate bundle 18 is placed on the placement plate 52, the placement plate 52 is urged upward by a urging member (not shown), and the uppermost lithographic printing plate 20 (or interleaf paper 22) is surely picked up. 42 is contacted.

  Two guide plates 54 and 56 are arranged at a predetermined interval in the transport direction downstream of the mounting portion 14 in the transport direction. The planographic printing plate 20 is conveyed while being supported by the guide plates 54 and 56.

  A slip sheet separating device 58 is disposed between the guide plates 54 and 56. The interleaf separator 58 includes a transport roller unit 60 and a retard roller unit 62 that are sequentially disposed along the transport direction. Each of these is composed of a rotatable shaft 64 spanned along the width direction and a plurality of rubber rollers 66 fixed to the shaft 64 at a predetermined interval. When rotated by receiving driving force from the drive motor 61, the rubber roller 66 of the transport roller unit 60 rotates (forward) in the direction of arrow R1, and the rubber roller 66 of the retard roller unit 62 rotates (reverse) in the direction opposite to the arrow R1. To do.

  The retard roller unit 62 has a first contact position (a position indicated by a solid line in FIG. 6A and FIG. 3) and a second contact, which are in contact with the interleaving paper 22 by a drive unit 68 provided at one end thereof. It moves (moves up and down) between a position (a position indicated by a solid line in FIG. 8A) and a separation position (a position indicated by an alternate long and short dash line in FIG. 3) that is separated from the interleaf paper 22. The second contact position is an operation position when only the slip sheet is conveyed, which will be described later. At the first contact position, the retard roller unit 62 reverses in contact with the slip sheet 22, so that the slip sheet 22 can be separated from the planographic printing plate 20. Further, as shown in FIG. 6B, the rubber roller 66 of the retard roller unit 62 contacts the rubber roller 66 of the transport roller unit 60 so that the slip sheet 22 can be nipped with the rubber roller 66 of the transport roller unit 60. .

  A nip roller 70 is looped over the transport roller unit 60 so as to be rotatable along the width direction. The nip roller 70 is in contact with the rubber roller 66 of the transport roller unit 60 by its own weight so that the lithographic printing plate 20 and the interleaf 22 can be nipped. When the rubber roller 66 of the transport roller unit 60 rotates in the direction of arrow R1 in the nipped state, the planographic printing plate 20 and the interleaf paper 22 are transported in the direction of arrow F. As can be seen from FIGS. 3 and 6A and 6B, a gap is formed between the nip roller 70 and the rubber roller 66 of the retard roller unit 62 so as not to nip the planographic printing plate 20 and the interleaf. Has been.

  Below the transport roller unit 60 and the retard roller unit 62, interleaf transport roller units 72A and 72B are arranged, respectively. Similarly to the transport roller unit 60 and the retard roller unit 62, the interleaf transport roller units 72A and 72B are composed of a shaft 64 and a rubber roller 66. The interleaf paper 22 is interposed between the rubber rollers 66 of the interleaf transport roller units 72A and 72B. Can be nipped. An endless drive belt 74 is wound around the shaft 64 of the transport roller unit 60 and the shaft 64 of the interleaf transport roller unit 72A, and the interleaf transport roller unit 72A is synchronized with the transport roller unit 60 in the same direction. Rotate to. Similarly, a drive belt 74 is also wound around the shaft 64 of the retard roller unit 62 and the shaft 64 of the interleaf transport roller unit 72B. Therefore, the nipped interleaf paper 22 can be conveyed downward by rotating with the interleaf paper 22 nipped between the rubber rollers 66 of the interleaf paper conveyance roller units 72A and 72B. At this time, the slip sheet 22 is guided by the drive belt 74.

  As shown in FIG. 2, a stacking box 76 is provided below the slip sheet conveyance roller units 72A and 72B, and the slip sheets 22 are stacked.

  As shown in FIGS. 2 and 3, a presence / absence sensor 78 and a discrimination sensor 80 are attached to the holder 40 upstream of the pickup roller 42 in the transport direction. The guide plate 54 is also provided with a presence / absence sensor 82 and a discrimination sensor 84 in order from the upstream side, and a discrimination sensor 86 is held above the guide plate 54 by a holding member (not shown). Further, the guide plate 56 is also provided with a presence / absence sensor 88 and a discrimination sensor 90 in order from the upstream side. These presence / absence sensors 78, 82, 88 detect the presence / absence of the lithographic printing plate 20 or slip sheet 22, and the discrimination sensors 80, 84, 86, 90 detect whether this is the lithographic printing plate 20 or slip sheet. 22 is determined.

  Corresponding to the presence / absence sensor 78, a notch 79 is formed in the mounting plate 52 of the mounting tray 30. When the plate bundle 18 (lithographic printing plate 20 or interleaf paper 22) is placed on the placement plate 52, the light from the presence / absence sensor 78 is reflected by the planographic printing plate 20 and receives this reflected light. Otherwise, the light from the presence / absence sensor 78 passes through the notch 79. Thereby, presence / absence of the plate bundle 18 can be detected.

  A slip sheet detection sensor 92 is disposed between the transport roller unit 60 and the retard roller unit 62 and the corresponding slip sheet transport roller units 72A and 72B, respectively, so that the passage of the slip sheet 22 can be detected. ing.

  Information detected by the above-described presence / absence sensors 78, 82, 88, discrimination sensors 80, 84, 86, 90 and slip sheet detection sensor 92 is sent to a control device (not shown), and the control device, based on this information, Each part of the planographic printing plate supply device 12 is controlled.

  When supplying the lithographic printing plate 20 to the exposure device by the lithographic printing plate supply device 12 having the above-described configuration, first, the plate bundle 18 is placed on the placement unit 14. At this time, the rear end 18B of the plate bundle 18 is brought into contact with the rear end guide plate 34, and the side end thereof is brought into contact with the side end guide plate 32 to be aligned.

  When the lithographic printing plate supply device 12 is mounted at a predetermined position of the exposure device, as shown in FIG. 1, the cover 36A is rotated upward to expose a part of the plate bundle 18 (near the front end).

  In this state, since the presence / absence sensor 78 detects the presence of the lithographic printing plate 20 or the interleaf 22 in the placement portion 14, the holder 40 is driven by the drive unit 50, and FIG. As shown, the pickup roller 42 contacts the plate bundle 18.

  Here, the load W acting on the plate bundle 18 from the pickup roller 42 is a case where only the planographic printing plate 20A is fed, and a set of the planographic printing plate 20A and the interleaf 22A (that is, the laminated set 24A as one unit). ) Adjusted according to the case of double feeding. Therefore, it is possible to arbitrarily switch between single feed and double feed. In the following, first, in the case of double feeding, separation of the slip sheet 22 from the planographic printing plate 20 by the slip sheet separating device 58 will be described.

  In the middle of conveyance, it is determined that double feeding is performed based on the detection results of the presence / absence sensor 82 and the discrimination sensors 84 and 86, and the conveyance roller unit 60 and the pickup roller unit 62 rotate. Further, when it is detected by the presence / absence sensor 88 and the discrimination sensor 90 that the planographic printing plate 20 and the interleaf paper 22 are conveyed in a double feed state, as shown by a solid line in FIG. The roller unit 62 rises. Then, the rubber roller 66 of the retard roller unit 62 contacts the interleaf paper 22 while reversing, so that the interleaf paper 22 has a force in the conveyance direction from the conveyance roller unit 60 and a conveyance direction from the retard roller unit 62. Since the directional force acts, it can be separated from the lithographic printing plate 20. The interleaf paper 22 is sandwiched between the transport roller unit 60 and the rubber roller 66 of the retard roller unit 62 with the intermediate portion bent, and is transported downward. Accordingly, the presence / absence sensor 88 detects the presence of the lithographic printing plate 20, but the discrimination sensor 90 indicates that the slip sheet 22 does not exist, that is, the slip sheet 22 is removed from the lithographic printing plate 20. I understand that. The conveyance roller unit 60 and the retard roller unit 62 are stopped after a lapse of a predetermined time (for example, 5 seconds) after the interleaf 22 is detected by the interleaf detection sensor 92 and the trailing edge of the interleaf 22 has passed, and the retard roller unit 62 is further stopped. 62 is lowered to the spaced position.

  Thereafter, the lithographic printing plate 20 from which the interleaf paper 22 is separated is detected by the presence / absence sensor 88 and the discrimination sensor 90. The planographic printing plate 20 is further conveyed and sent to the exposure apparatus. The interleaf paper 22 is collected in a collection box 76.

  On the other hand, when only the planographic printing plate 20 is fed, the retard roller unit 62, as shown in FIG. 7, has a rubber roller based on the detection results of the presence / absence sensor 82 and the discrimination sensors 84 and 86. The separated position is maintained while 66 is reversed. For this reason, the rubber roller 66 of the retard roller unit 62 does not come into contact with the planographic printing plate 20, and the planographic printing plate 20 is conveyed as it is and sent to the exposure apparatus.

  Further, when only the slip sheet 20 is single-fed, based on the detection results by the presence / absence sensor 82 and the discrimination sensors 84, 86, the retard roller unit 62, as shown in FIG. While 66 is reversed, it rises to the second contact position before the leading edge of the interleaf paper 22 arrives. At this time, since the rubber roller 66 of the retard roller unit 62 enters the conveyance path of the interleaf paper 22, the tip of the conveyed interleaf paper 22 hits the rubber roller 66 as shown in FIG. 22 is guided downward. And it is clamped by the rubber roller 66 of the conveyance roller unit 60 and the retard roller unit 62, and is conveyed below. After a predetermined time has elapsed after the slip sheet detection sensor 92 detects the passage of the trailing edge of the slip sheet 22, the transport roller unit 60 and the retard roller unit 62 are stopped, and the retard roller unit 62 is lowered to reach the separated position.

  In the slip sheet separating device 58 of the first embodiment, the retard roller unit 62 does not necessarily have to rotate with the conveyance roller unit 60 and the rubber roller 66 in contact with each other. For example, a drive motor that rotationally drives the retard roller unit 62 may be further provided and rotated independently of the transport roller unit 60.

  Further, the retard roller unit 62 does not have to rotate at the same peripheral speed in the opposite direction to the transport roller unit 60. For example, even if the retard roller unit 62 rotates in the same direction, the peripheral speed is higher than that of the transport roller unit 60. If it is late, the interleaf 22 can be loosened between the transport roller unit 60 and the retard roller unit 62 and separated from the planographic printing plate 20. However, as described above, it is preferable to rotate the retard roller unit 62 in the opposite direction to the transport roller unit 60 at the same peripheral speed because the slip sheet 22 can be sandwiched and transported between these rubber rollers 66 without slipping. .

  FIGS. 9A and 9B show an interleaf separating apparatus 96 according to the second embodiment of the present invention. In the planographic printing plate supply apparatus according to the second embodiment, only the interleaf separating apparatus is used. Although different from the first embodiment, the rest of the configuration is the same, and the detailed description of the same parts will be omitted.

  In the slip sheet separating device 96 of the second embodiment, a suction fan 98 that sucks the slip sheet 22 by air is provided instead of the retard roller unit 62 of the first embodiment. The suction fan 98 is disposed on the downstream side of the transport roller unit 60 and in a non-contact position with the interleaf paper 22, and as shown in FIG. 9 is not sucked, but as shown in FIG. 9B, when the suction fan 98 is turned on, the slip sheet 22 can be separated from the planographic printing plate 20 by suction. The separated slip sheet 22 can be transported by a slip sheet transport roller or the like (not shown) and can be stacked in a stacking box 76 (see FIG. 1) similar to the first embodiment.

  In the second embodiment, when only the lithographic printing plate 20 is fed alone, the suction fan 98 may be turned off so that the lithographic printing plate 20 is not sucked. In addition, when only the slip sheet 22 is fed, the slip sheet 22 may be sucked by the suction fan 98.

  As described above, in each embodiment of the present invention, by adjusting the load W acting on the plate bundle 18 from the pickup roller 42, it is possible to reliably switch between single feeding and double feeding. In the case of double feeding, it is possible to take out the lithographic printing plate 20 more quickly than in the case where the lithographic printing plate 20 or the interleaf paper 22 is sequentially single-fed. Further, in the configuration in which the lithographic printing plate 20 and the interleaf 22 are separately taken out, a take-out mechanism corresponding to each is required. However, in the present invention, since it can be taken out by one pickup roller 42, an individual take-out mechanism is not required. Moreover, since it is not necessary to use a conventional suction cup or the like, the configuration is small, simple and low cost.

  In the above description, an example in which the load W from the pickup roller 42 is adjusted so that the lithographic printing plate 20 and the interleaf 22 are single-fed or double-fed has been described. Some lithographic printing plates 20 and slip sheets 22 can be separated. Therefore, in this case, in the present invention, the above-described load W may be adjusted to actively perform multiplex feeding.

  The planographic printing plate 20 to be supplied in the present invention is not particularly limited, but it is preferable that the planographic printing plate 20 is not affected by the load W acting from the pickup roller 42. In particular, since it is assumed that the load W is positively increased in the present invention, a lithographic printing plate that does not generate so-called pressure fogging even when such a large load acts is preferable. Specifically, a photopolymer type lithographic printing plate having a strength generally 10 times or more that of external force as compared with a thermal type lithographic printing plate can be mentioned.

It is a side view which shows the planographic printing plate supply apparatus of 1st Embodiment of this invention. It is a perspective view which shows the mounting part and sending part of the lithographic printing plate supply apparatus of 1st Embodiment of this invention. It is a schematic side view which shows the mounting part and sending part of the planographic printing plate supply apparatus of 1st Embodiment of this invention. It is explanatory drawing explaining the aspect in the taking-out of the lithographic printing plate in a lithographic printing plate supply apparatus, (A) is a case of double feed, (B) is a single feed, (C) is a case of multiple sending. (A) is a graph which shows the relationship between the load from a pick-up roller, and conveyance force in a lithographic printing plate supply apparatus, (B) is explanatory drawing which shows each conveyance force between this load and a lithographic printing plate-slip sheet. It is. 2A and 2B are explanatory views showing an interleaf separation operation in an interleaf separation device in the planographic printing plate supply apparatus according to the first embodiment of the present invention, in which FIG. It is in a position. It is explanatory drawing which shows the lithographic printing plate conveyance operation | movement in the slip sheet separation apparatus in the lithographic printing plate supply apparatus of 1st Embodiment of this invention. It is explanatory drawing which shows the slip sheet conveyance direction switching operation | movement in the slip sheet separator in the planographic printing plate supply apparatus of 1st Embodiment of this invention, (A) is the state in which a retard roller unit exists in a contact position, (B) Is in a separated position. It is explanatory drawing which shows the slip sheet separation operation | movement by the slip sheet separator in the planographic printing plate supply apparatus of 2nd Embodiment of this invention, (A) is a state with a suction fan OFF, (B) is a suction fan on. It is a state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Planographic printing plate supply apparatus 14 Placement part 16 Delivery part 18 Plate bundle 20 Interleaf paper 20 Lithographic printing plate 20A Planographic printing plate 20E Photosensitive surface 20B Back surface 22 Interleaf 22A Interleaf 24 Laminated group 24A Laminated group (End area layer group) )
42 Pickup roller (conveying roller, conveying means)
58 Interleaf separator 60 Conveyance roller unit (forward roller)
62 retard roller unit (reverse roller)
66 Rubber roller 76 Accumulation box 78 Existence / non-sensor 80 Discrimination sensor 82 Existence / absence sensor 84 Discrimination sensor 86 Discrimination sensor 88 Existence / non-sensor 90 Discrimination sensor 92 Interleaf detection sensor 96 Interleaf separation device 98 Suction fan (suction device, separation) apparatus)

Claims (6)

Conveying force acting on the interleaf sheet from the back surface of the lithographic printing plate in the end area layer group of the end surface in the laminating direction with respect to the laminated bundle in which the laminated group composed of the lithographic printing plate and interleaf paper is laminated in the thickness direction, Conveying means capable of conveying the end area layer set by applying a load in a range larger than the maximum static frictional force between the interleaf and the photosensitive layer of the laminated set of the next layer to the planographic printing plate of the end area layer set ;
A separating device for separating the planographic printing plate and the slip sheet from the laminated set conveyed by the conveying means;
A lithographic printing plate supply device comprising: A transport roller that applies a transport force by rotating while the transport means is in contact with the end area layer set;
The lithographic printing plate supply apparatus according to claim 1, comprising: The separation device comprises:
A forward roller that contacts the slip sheet being transported and rotates in the same direction as the transport direction;
A reversing roller that contacts the interleaf sheet downstream of the forward roller in the conveying direction and relatively rotates in a direction opposite to the conveying direction of the forward roller;
The lithographic printing plate supply apparatus according to claim 1, wherein the lithographic printing plate supply apparatus is provided.   The lithographic printing plate supply device according to claim 3, wherein the reverse rotation roller is movable between a contact position that contacts the slip sheet and a separation position that is spaced from the slip sheet. The separation device comprises:
A suction device that sucks and separates the interleaf from the planographic printing plate;
The lithographic printing plate supply apparatus according to any one of claims 1 to 4, wherein the lithographic printing plate supply apparatus is provided.   6. The detection sensor according to claim 1, further comprising a detection sensor capable of detecting the presence or absence of a planographic printing plate and a slip sheet upstream of the separation device in the transport direction. Lithographic printing plate feeder.

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