JP2008247579A - Plate feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and certainly position a plate even when a comparatively large plate is used. <P>SOLUTION: This plate feeding device includes: a storage section 10 for loading a plurality of plates P with their end aligned; a plate conveying mechanism 14 for conveying the plates P loaded in the storage section 10; a roller for movably supporting the storage section 10; a storage section moving mechanism 26 for moving the storage section 10 within a plane in parallel with the surface of each of the plates P; sensors 51, 53 for detecting the position of end of each of the plates P loaded in the storage section 10; and a control section for controlling the storage section moving mechanism 26 based on signals from the sensors 51, 53. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a printing plate supply apparatus that conveys a loaded printing plate to a subsequent processing section.

  For example, in Patent Document 1, as a printing plate supply device that reverses a printing plate and transports it to a nip roller, a circle having a radius of rotation at a suction point where the front end of the printing plate is sucked and held by a suction plate is disclosed. There has been disclosed a plate supply apparatus in which the plate surface is moved so as to coincide with a cycloid curve formed when the plate surface is rotated, and the front end of the plate is held by a nip roller.

  A plate supply device that reverses the front and back of the plate and transports it to the nip roller can reliably transport the plate without occupying a large space even when transporting a relatively large plate. It has the advantage of being able to.

By the way, in recent years, a so-called skid-type plate loading method for supplying a plurality of plates on a pallet has been proposed (Patent Document 2 and Patent Document 3). reference).
Japanese Patent Laid-Open No. 2000-247489 JP-A-11-282170 JP 2001-75289 A

  As a printing plate used in such a printing plate supply device, there is an extremely large size plate. In such a case, in the plate supply apparatus described in each of the above-mentioned patent documents, there is a problem that it is difficult to position the plate simply and accurately.

  The present invention has been made to solve the above-described problems, and provides a printing plate supply apparatus that can easily and accurately position the printing plate even when a relatively large printing plate is used. With the goal.

  The invention described in claim 1 is a printing plate supply apparatus for transporting a loaded printing plate to a subsequent processing unit, and a storage unit for loading a plurality of printing plates with their edges aligned. A plate transport mechanism that transports the printing plate loaded in the storage unit; a support member that supports the storage unit movably in a plane parallel to the surface of the plate loaded in the storage unit; A storage unit moving mechanism for moving the storage unit in a plane parallel to the surface of the printing plate loaded in the storage unit; a sensor for detecting the position of the edge of the printing plate loaded in the storage unit; And a control unit that controls the storage unit moving mechanism based on a signal from the sensor.

  According to a second aspect of the present invention, in the first aspect of the invention, the storage unit moving mechanism is configured to change a distance between a pair of arms having one end hinged and the other end of the pair of arms. And a pantograph type link mechanism provided with a distance changing mechanism.

  According to a third aspect of the present invention, in the second aspect of the invention, the pantograph-type link mechanism is orthogonal to each other at positions corresponding to two mutually orthogonal sides of the four sides of the printing plate. At least one each is provided at a position facing the other two sides.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the printing plate transport mechanism reverses the stacked printing plates from the top to the bottom so that the nip roller is turned on. The plate transport mechanism is movable along the surface of the plate loaded in the storage unit in a direction perpendicular to the axial direction of the nip roller. And a holding portion that is disposed at the tip of an arm that can be rotated about the moving portion, and that can hold the vicinity of the edge opposite to the nip roller of the printing plate loaded in the storage portion from the upper surface thereof And moving the moving part from the opposite side of the nip roller to the nip roller side along the surface of the plate loaded in the storage part, and rotating the arm around the moving part. The above After the vicinity of the periphery of the plate holding was reversed by the lifting unit, and a moving mechanism for moving to a position sandwiched by the nip rollers.

  The invention according to claim 5 is the invention according to claim 4, wherein the sensor is attached to the arm.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the holding portion includes a suction portion capable of sucking and holding the printing plate.

  According to the first aspect of the present invention, even when a relatively large printing plate is used, the printing plate can be easily and accurately positioned.

  According to the second aspect of the present invention, it is possible to reliably position the printing plate even when the storage unit moving mechanism is configured more simply.

  According to invention of Claim 3, it becomes possible to move an accommodating part to arbitrary positions.

  According to the fourth aspect of the present invention, it is possible to accurately convey the printing plate even when a printing plate conveyance mechanism having a restriction on the adsorption holding position of the printing plate is used.

  According to the invention described in claim 5, it is possible to simplify the apparatus configuration.

  According to invention of Claim 6, a printing plate can be hold | maintained by adsorption | suction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an image recording system provided with a printing plate supply apparatus according to the present invention.

  This image recording system includes an autoloader unit 2 for taking out and transporting the printing plate P loaded therein, an image recording unit 3 for recording an image on the printing plate P, a developing unit 4, and ejection of the contact balls D. Unit 5, slip sheet discharge unit 6, and transport mechanism 7 including conveyors 71 and 72.

  The transport mechanism 7 transports the printing plate P transported from the autoloader unit 2 to the image recording unit 3, transports the contact ball D transported from the autoloader unit 2 to the discharge unit 5 of the contact ball D, and the image recording unit 3. The printing plate P on which the image is recorded is conveyed to the developing unit 4.

  In other words, the transport mechanism 7 includes a pair of transport units arranged in a superposed manner, and the upper transport unit transfers the printing plate P discharged from the autoloader unit 2 in a direction perpendicular to the discharge direction. While being conveyed and conveyed to the image recording unit 3, the contact ball D conveyed from the autoloader unit 2 is conveyed in a direction orthogonal to the discharge direction and conveyed to the discharge unit 5 of the contact ball D. On the other hand, the lower transport unit transports the printing plate P discharged from the image recording apparatus 3 in a direction orthogonal to the discharge direction and transports it to the developing unit 4. Such a transport mechanism 7 is disclosed in Japanese Patent Application No. 2006-056227.

  The autoloader unit 2 described above constitutes a printing plate supply apparatus according to the present invention. Hereinafter, the configuration of the autoloader unit 2 will be described. FIG. 2 is a schematic side view of the autoloader unit 2. 3 and 4 are perspective views showing a part of the autoloader unit 2 omitted.

  The autoloader unit 2 includes a storage unit 10 for stacking a plurality of printing plates P together with a slip sheet and a contact ball D, with the edges thereof aligned with a stopper 11, and the printing plates P in the storage unit 10. The first and second nip rollers 12 and 13 for transporting to the conveyor 71 of the transport mechanism 7, the printing plate transport mechanism 14 for transporting the printing plate P and the contact ball D from the storage unit 10, and the combination from the storage unit 10. An interleaf transport mechanism 15 that transports interleaving paper to the paper discharge section 6 and a storage section moving mechanism 26 that moves the storage section 10 in a plane parallel to the surface of the printing plate P loaded thereon.

  The first nip roller 12 and the second nip roller 13 are arranged at different height positions. The 2nd nip roller 13 is arrange | positioned in the position facing the conveyor 71 of the conveyance mechanism 7 mentioned above. Further, the first nip roller 12 is disposed at a position facing the conveyance guide 73 disposed on the upper portion of the conveyor 71.

  The storage unit 10 includes a skid base 21, a wooden pallet 22 on which a plurality of printing plates P are stacked, a stopper 11 for positioning the printing plates, and a connecting member 23 for fixing the stopper 11 to the skid base 21. With. The pallet 22 and the printing plate P loaded on the pallet 22 constitute a so-called skid.

  The skid base 21 in the storage unit 10 is supported by a support member 25 having a large number of rollers 24 on its upper surface. For this reason, the storage unit 10 is movable in a plane parallel to the surface of the printing plate P loaded in the storage unit 10. A storage unit moving mechanism 26 that moves the storage unit 10 in a plane parallel to the surface of the printing plate P is disposed around the storage unit 10.

  FIG. 5 is an enlarged perspective view showing one of the storage unit moving mechanisms 26.

  The storage unit moving mechanism 26 is configured by a pantograph-type link mechanism having a pair of arms 32 and 33, one end of which is hinged by a shaft 31, and a pressing unit 38. The other end of one arm 33 of the pair of arms 32 and 33 is fixed to the base 39. On the other hand, a base portion 36 is fixed to the other end portion of the other arm 31 so as to be screwed into a screw 35 rotated by driving of a motor 37 and guided to the guide member 24. For this reason, by changing the distance between the other end portions of the pair of arms 31 and 32 by driving the motor 37, the pressing position of the skid base 21 in the storage portion 10 by the pressing portion 38 can be changed.

  6 to 9 are schematic views showing the pressing state of the skid base 21 by the storage unit moving mechanism 26. FIG.

  As shown in FIG. 6, the storage unit moving mechanism 26 described above has two positions corresponding to two mutually orthogonal sides of the four sides of the printing plate P, and positions facing the other two mutually orthogonal sides. One is provided for each. In other words, the storage unit moving mechanism 26 is located at one position corresponding to one of the two sides extending in the X direction shown in FIG. Two are provided, one at the position corresponding to one of the two sides extending in the Y direction shown in FIG. 6 on the printing plate P, and two at the position corresponding to the other one. Yes.

  When the printing plate P is moved in the Y direction together with the skid base 21 by the storage unit moving mechanism 26, the storage unit moving mechanism 26 corresponding to the side extending in the X direction on the printing plate P is used as shown in FIG. To do. Similarly, when the printing plate P is moved in the X direction together with the skid base 21, a storage portion moving mechanism 26 corresponding to the side extending in the Y direction in the printing plate P is used as shown in FIG. Further, when the printing plate P is moved in the θ direction together with the skid base 21, as shown in FIG. 9, the storage portion moving mechanism 26 corresponding to the side extending in the X direction on the printing plate P and the side extending in the Y direction are provided. A corresponding storage unit moving mechanism 26 is used.

  With the above configuration, the position of the printing plate P stored in the storage unit 10 can be arbitrarily set. For this reason, in the positioning process of the printing plate P, which will be described later, the printing plate P can be moved in the X, Y, and θ directions. Further, in the transporting process of the printing plate P to be described later, the printing plate P can be moved in the X direction, which is a direction orthogonal to the axial direction of the first and second nip rollers 12 and 13.

  Referring to FIGS. 2 to 4 again, the printing plate transport mechanism 14 that transports the printing plate P and the contact ball D from the storage unit 10 is not illustrated with an endless synchronization belt 42 that is rotated by the drive of a motor 41. It is connected by a connecting member, and includes a moving unit 43 that reciprocates in the direction along the surface of the printing plate P stacked in the storage unit 10 and orthogonal to the axial direction of the first and second nip rollers 12 and 13. .

  The printing plate transport mechanism 14 is disposed at the tip of an arm 44 that can be rotated around a moving unit 43, and the first and second nip rollers 12 of the printing plate P stacked in the storage unit 10. 13, an adsorbing portion 45 capable of adsorbing and holding the vicinity of the edge opposite to the upper surface from the upper surface, a motor 46 for rotating the arm 44 around the moving portion 43, and the arm 44 moving with respect to the moving portion 43. Thus, a motor 47 for changing the distance from the moving portion 43 to the suction portion 45 in the arm 44 and a guide roller 48 for the printing plate P are provided.

  As shown in FIG. 3, a pair of sensors 51 for detecting the edge of the printing plate P is disposed at one end of the printing plate transport mechanism 14. As shown in FIG. 4, the end of the printing plate transport mechanism 14 opposite to the sensor 51 is at the top of the printing plate P, the interleaf, and the hitting ball D loaded in the storage unit 10. A sensor 52 is provided for identifying which of the printing plate P, the slip sheet, and the contact ball D is located.

  Referring to FIGS. 2 and 3 again, the interleaf transport mechanism 15 for transporting interleaving paper from the storage portion is attached to the lower end portion of the arm 55, and an adsorbing portion 54 for attracting and holding the interleaving paper from its upper surface. And a motor 56 that moves the suction portion 54 up and down via the arm 55, and a motor 57 that moves the suction portion 54 back and forth via the arm 55. When the slip sheet is discharged by the slip sheet transport mechanism 15, the suction unit 54 is moved to the upper surface of the slip sheet by driving the motors 56 and 57, and the slip sheet is sucked and held there and transported to the discharge roller mechanism 58. The slip sheet is discharged to a slip sheet discharge unit 6 shown in FIG.

  As shown in FIG. 3, a sensor 53 similar to the pair of sensors 51 described above for detecting the edge of the printing plate P is disposed at one end of the interleaf transport mechanism 15.

  FIG. 10 is a block diagram showing an electrical configuration of part of the image recording system including the autoloader unit 2 described above.

  This image recording system includes a control unit 100 including a RAM 102 that temporarily stores data and the like during control, a ROM 101 that stores an operation program necessary for controlling the apparatus, and a CPU 103 that executes a logical operation. The control unit 100 is connected to the sensors 51, 52, and 53 through the sensor interface 104 as described above. The control unit 100 is connected to the motors 37, 41, 46, 47, 56, 57 described above via the motor interface 105.

  Next, the conveying operation of the printing plate P by the autoloader unit 2 will be described. FIG. 11 is an explanatory diagram showing the conveying operation of the printing plate P by the autoloader unit 2. In FIG. 11, the movement operations of the plate transport mechanism 14 are indicated by (a), (b), and (c), respectively. 2 is driven by the motors 41, 46, and 47 shown in FIG. 2, the moving unit 43 shown in FIG. 2 reciprocates, and the arm 55 rotates and expands and contracts.

  When the printing plate P is conveyed by the autoloader unit 2, first, as shown by reference numeral 14 (a) in FIG. 11, the suction plate 45 is located near the uppermost plate P edge. Is moved to a position where it can be sucked, and the vicinity of the edge of the printing plate is sucked and held. In this state, the arm 55 is suspended downward.

  In this state, the motor 43 is driven to move the moving unit 43 toward the first and second nip rollers 12 and 13. At the same time, by driving the motor 46, the arm 55 is rotated clockwise about an axis that faces the horizontal direction. As a result, as shown by reference numeral 14 in FIG.

  Then, the moving operation of the moving unit 43, the rotating operation of the arm 44, and the change of the distance between the moving unit 43 and the suction unit 45 are continued as necessary, and printing is performed as indicated by reference numeral 14 (c) in FIG. The edge of the plate P is sandwiched between the first nip roller 12 (or the second nip roller 13). Thereafter, the holding of the printing plate P by the suction unit 45 is released.

  When the plate P is conveyed by the plate conveying mechanism 14 in the above-described operation, the end of the plate P on the stopper 11 side faces the vertical direction as in the case shown in FIG. A phenomenon may occur in which the edge of the printing plate P on the stopper 11 side enters between the edge of the loaded printing plate P and the stopper 11. Therefore, in the autoloader unit 2, the length in the moving direction of the moving unit 43 in the printing plate P loaded in the storage unit 10 or the height position of the uppermost part of the printing plate P loaded in the storage unit 10. Based on the first and second nip rollers, the position of the printing plate P is changed by changing the position of the storage unit 10 moved by the storage unit moving mechanism 26, and the positions of the plates P are different from each other. 12 and 13 are selectively used.

  Next, an image recording operation by the above-described image recording system will be described. FIG. 12 is an explanatory diagram showing an image recording operation by the image recording system.

  When starting the image recording operation, first, the printing plate P is carried in (step S1). At this time, the printing plate P is in a skid state in which the printing plate P is stacked on the pallet 22 together with the slip sheets and the contact balls D. At the time of loading the printing plate P, a hawk lift or the like is used. In this state, the printing plate P is positioned at a rough position.

  Next, the loading height of the printing plate P or the like is measured (step S2). The stack height is measured using a metal sensor (not shown) attached to the interleaf transport mechanism 15. Then, the suction portion 54 in the interleaf transport mechanism 15 is lowered together with the arm 55, and the height at which a metal sensor (not shown) detects the printing plate P and is turned on is measured.

  Next, the printing plate P and the like are positioned by positioning the skid base 21 (step S3). At this time, the position of the edge of the printing plate P or the like is measured at three positions by a pair of sensors 51 attached to the plate conveying mechanism 14 shown in FIG. 3 and a sensor 53 attached to the interleaf conveying mechanism 15. To do. In this state, as shown in FIG. 5, the distance between the other end portions of the pair of arms 31 and 32 is changed by driving the motor 37 to change the pressing position of the skid base 21 in the storage portion 10 by the pressing portion 38. As a result, the skid base 21 is moved. Then, the position of the skid base 21 is confirmed by the sensors 51 and 53 while moving the sensors 51 and 53 as necessary, and the skid base 21 is stopped when the skid base 21 is positioned at a desired position.

  As described above, the printing plate P is positioned by the stopper 11, and the stopper 11 is fixed to the skid base 21 via the connecting member 23. For this reason, positioning the skid base 21 positions the printing plate P via the skid base 21. The positioning operation of the skid base 21 is controlled by the control unit 100 shown in FIG.

  When the positioning operation of the skid base 21 is completed, the transport operation of the printing plate P is started. At this time, first, of the printing plates P and the like stacked on the storage unit 10 by the sensor 52 shown in FIG. Whether it exists is identified (step S4).

  When the slip sheet is arranged at the top (step S6), the slip sheet is discharged by the slip sheet transport mechanism 15 (step S5). That is, by driving the motors 56 and 57, the suction portion 54 is moved to the upper surface of the slip sheet, and the slip sheet is sucked and held there and conveyed to the discharge roller mechanism 58. The slip sheet is discharged to the slip sheet discharge section 6 shown in FIG.

  Further, when the hit ball D is arranged at the top (step S8), the hit ball D is discharged (step S7). In this case, first, the contact ball D is reversed and transported in the state shown in FIG. 11 by the plate transport mechanism 14, and the edge of the contact ball D is moved to the first nip roller 12 (or the second nip roller 13). ). Then, the contact ball D is transported to the transport unit on the upper side of the transport mechanism 7 by the conveyor 71 of the transport mechanism 7 shown in FIG. 1, and is then orthogonal to the transport direction so far by the upper transport unit. And is discharged to the discharge portion 5 of the contact ball D.

  On the other hand, when the printing plate P is arranged at the top instead of the slip sheet or the contact ball D, after determining the discharge destination of the printing plate P and the position of the printing plate P at the time of conveying the printing plate (step) S9), transport of the printing plate P is started (step S10).

  As described above, in the autoloader unit 2, the length of the moving unit 43 in the moving direction of the printing plate P loaded in the storage unit 10 or the height of the uppermost part of the printing plate P loaded in the storage unit 10 is high. The position of the printing plate P is changed by changing the position of the storage unit 10 moved by the storage unit moving mechanism 26 based on the position, and the first and second plates arranged at different heights from each other. The nip rollers 12 and 13 are selectively used.

  That is, based on the length in the moving direction of the moving unit 43 in the printing plate P loaded on the storage unit 10 and the height position of the uppermost part of the printing plate P loaded on the storage unit 10, the storage unit moving mechanism 26 The position of the storage unit 10 to be moved is adjusted.

  Further, for example, when the size of the printing plate P is small and the stacking height is high, or when the size of the printing plate P is large and the stacking height is low, it is directed toward the first nip roller 12. When the printing plate P is conveyed and the size of the printing plate P is small and the stacking height is low, or when the size of the printing plate P is large and the stacking height is high, the second nip roller The printing plate is conveyed toward 13.

  Thereafter, the printing plate conveying mechanism 14 reverses and conveys the printing plate P in the state shown in FIG. 11, and the edge of the printing plate P is sandwiched between the first nip roller 12 (or the second nip roller 13), The printing plate P is transported to the transport mechanism 7. The transport mechanism 7 transports the printing plate P discharged from the autoloader unit 2 in the direction perpendicular to the discharge direction to the image recording unit 3.

  Then, after the image is recorded on the printing plate P by the image recording device 3, the printing plate P is conveyed to the developing unit 4 and subjected to development processing (step S11).

  Thereafter, the process returns to step S4 and the process is repeated. When necessary processing is completed or when the printing plate P is no longer in the storage unit 10 (step S12), the processing is terminated.

  In the above-described embodiment, the case where the pair of sensors 51 is disposed at one end of the plate transport mechanism 14 and the sensor 53 is disposed at one end of the interleaf transport mechanism 15 has been described. However, these sensors 51 and 53 may be disposed in either the plate transport mechanism 14 or the interleaf transport mechanism 15, and these sensors 51 and 53 may be fixed to the apparatus. .

  In the above-described embodiment, the printing plate P is held by the suction unit 44 and the slip sheet is held by the suction unit 54. However, the holding means is not limited to suction as long as the printing plate P and the slip sheet can be reliably held. For example, the printing plate P may be held using a hook-shaped member. Alternatively, a pair of rollers that rotate in opposite directions may be used to hold the slip sheet so as to be wound between the pair of rollers. Moreover, you may utilize magnetic force, static electricity, etc.

1 is a perspective view of an image recording system provided with a plate supply apparatus according to the present invention. 2 is a schematic side view of an autoloader unit 2. FIG. FIG. 3 is a perspective view showing a part of the autoloader unit 2 omitted. FIG. 3 is a perspective view showing a part of the autoloader unit 2 omitted. FIG. 4 is an enlarged perspective view showing one of the storage unit moving mechanisms 26. FIG. 6 is a schematic diagram illustrating a pressing state of the skid base 21 by the storage unit moving mechanism 26. FIG. 6 is a schematic diagram illustrating a pressing state of the skid base 21 by the storage unit moving mechanism 26. FIG. 6 is a schematic diagram illustrating a pressing state of the skid base 21 by the storage unit moving mechanism 26. FIG. 6 is a schematic diagram illustrating a pressing state of the skid base 21 by the storage unit moving mechanism 26. It is a block diagram which shows the one part electric structure of an image recording system. FIG. 5 is an explanatory view showing a transport operation of the printing plate P by the autoloader unit 2. It is explanatory drawing which shows the image recording operation | movement by an image recording system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Autoloader 3 Image recording part 4 Developing part 5 Ejection part 6 Ejection part 7 Conveyance mechanism 10 Storage part 11 Stopper 12 First nip roller 13 Second nip roller 14 Printing plate conveyance mechanism 15 Interleaf conveyance mechanism 21 Skid base 22 Palette 24 Roller 25 Support member 26 Storage part moving mechanism 32 Arm 33 Arm 35 Screw 36 Motor 41 Motor 42 Synchronous belt 43 Moving part 44 Arm 45 Adsorbing part 46 Motor 47 Motor 48 Guide roller 51 Sensor 52 Sensor 53 Sensor 54 Adsorbing part 55 Arm 56 Motor 57 Motor 58 Discharge roller mechanism 71 Conveyor 72 Conveyor 100 Control unit 104 Sensor interface 105 Motor interface D Contact ball P Printing plate

Claims (6)

In the plate supply device that transports the loaded plates to the subsequent processing section,
A storage section for loading a plurality of printing plates with their edges aligned,
A printing plate transport mechanism for transporting a printing plate loaded in the storage unit;
A support member for supporting the storage unit movably in a plane parallel to the surface of the printing plate loaded in the storage unit;
A storage unit moving mechanism for moving the storage unit in a plane parallel to the surface of the printing plate loaded in the storage unit;
A sensor for detecting the position of the edge of the printing plate loaded in the storage unit;
A control unit for controlling the storage unit moving mechanism based on a signal from the sensor;
An apparatus for supplying a printing plate, comprising: In the printing plate supply apparatus according to claim 1,
The storage portion moving mechanism is a printing press composed of a pantograph-type link mechanism including a pair of arms that are hinged at one end and a distance changing mechanism that changes the distance between the other ends of the pair of arms. Plate feeder. In the printing plate supply apparatus according to claim 2,
Two pantograph-type link mechanisms are provided at positions corresponding to two mutually orthogonal sides of the four sides of the printing plate, and at least one each at a position facing the other two orthogonal sides. Plate supply device. In the printing plate supply apparatus according to any one of claims 1 to 3,
The printing plate transport mechanism is to reverse the front and back of the loaded printing plate from its uppermost portion and transport it to a subsequent processing section via a nip roller,
The plate transport mechanism is
A movable part movable in a direction perpendicular to the axial direction of the nip roller along the surface of the printing plate loaded in the storage part;
A holding portion that is disposed at the tip of an arm that can be rotated around the moving portion, and that can hold the vicinity of the edge opposite to the nip roller of the printing plate stacked in the storage portion from its upper surface;
The moving part is moved from the opposite side of the nip roller to the nip roller side along the surface of the printing plate loaded in the storage part, and the arm is rotated around the moving part, thereby A moving mechanism for reversing the vicinity of the edge of the printing plate held by the holding portion and moving it to a position sandwiched by the nip roller;
A plate supply device comprising: In the printing plate supply apparatus according to claim 4,
The printing plate supply apparatus, wherein the sensor is attached to the arm. In the printing plate supply apparatus according to any one of claims 1 to 5,
The printing plate supply apparatus, wherein the holding unit includes a suction unit capable of sucking and holding the printing plate.