Positioning device for laser direct plate-making machine

Abstract

The invention provides a positioning device for a laser direct plate making machine, and relates to the technical field of plate making machines, the positioning device comprises a laser plate making machine, a fixing frame, a fixing guide rod, an electric sliding block, a reset plate, a vertical positioning mechanism, a transverse positioning mechanism and a pull-down mechanism, the fixing frame is fixedly connected to the interior of the laser plate making machine, and a feeding groove is formed in the laser plate making machine; four fixed guide rods are fixedly connected to the interior of the laser plate-making machine, every two fixed guide rods form a group, and an electric sliding block is slidably connected to each group of fixed guide rods; a reset plate is slidably connected between the two sets of fixing guide rods and fixedly connected with the two electric sliding blocks, a vertical positioning mechanism and a transverse positioning mechanism are arranged on the fixing frame, and a pull-down mechanism is arranged on the laser plate making machine and the fixing frame. According to the printing plate positioning device, printing plates of various sizes can be positioned and clamped, and the printing plates are positioned in the center of the fixing frame, so that the positioning effect on the printing plates is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to plate-making machines, and in particular to a positioning device for a laser direct plate-making machine. Background Art

[0002] Laser direct platemaking machine is a platemaking device that uses laser technology to directly form an image latent image on the printing plate. It scans and etches the printing plate through a laser beam according to the image information in the computer, thereby forming an image that can be used for printing on the printing plate.

[0003] When existing equipment performs small-scale proofing on printing plates of different sizes, it is often necessary to adjust the position of the positioning fixture to position and clamp the printing plate. The existing process is to manually adjust the positions of the other two fixtures first so that the two fixtures and the two fixed reference surfaces can place the printing plate, and then start the positioning device to position the printing plate. This does not have much impact on large-scale processing. For small-scale proofing, the fixture needs to be adjusted frequently, which leads to slow positioning of the printing plate. Moreover, the printing plate is positioned based on two fixed reference surfaces. When processing small printing plates, the positioning device will position the printing plate in a corner, which can easily lead to insufficient processing effect of the laser direct platemaking machine on the printing plate, and thus insufficient positioning effect of the printing plate. Summary of the invention

[0004] In order to overcome the shortcomings of existing equipment that the printing plate positioning speed is slow and small-sized printing plates are positioned in corners, resulting in insufficient printing plate positioning effect, the present invention provides a positioning device for a laser direct platemaking machine that can quickly position and clamp printing plates of various sizes and position the printing plates in the center of a fixed frame, thereby achieving better printing plate positioning effect.

[0005] The object of the present invention is to provide a positioning device for a laser direct platemaking machine, comprising a laser platemaking machine, a fixed frame, a fixed guide rod, an electric slider, a reset plate, a vertical positioning mechanism, a horizontal positioning mechanism and a pull-down mechanism, wherein the laser platemaking machine is fixedly connected with the fixed frame inside, a feed slot is provided on the laser platemaking machine, four fixed guide rods are fixedly connected with the laser platemaking machine inside, two fixed guide rods form a group, and an electric slider is slidably connected to each group of fixed guide rods;

[0006] A reset plate is slidably connected between the two groups of fixed guide rods, and the reset plate is fixedly connected to the two electric sliders. A vertical positioning mechanism is provided on the fixed frame, and the vertical positioning mechanism positions the printing plate in the vertical direction. A horizontal positioning mechanism is provided on the fixed frame, and the horizontal positioning mechanism positions the printing plate in the horizontal direction. A pull-down mechanism is provided on the laser platemaking machine and the fixed frame, and the pull-down mechanism is used to provide power.

[0007] Furthermore, the vertical positioning mechanism includes a lower moving frame, a guide frame, a covering plate, an upper slide frame, a pushing plate, a sliding rack and a rotating gear. The upper end of the fixed frame is slidably connected to the lower moving frame, and the lower moving frame is provided with a through groove and an open groove. One side of the fixed frame is fixedly connected to the guide frame, and the guide frame is provided with a sliding groove and two guide grooves. The covering plate is slidably connected between the two guide grooves of the guide frame, and the covering plate is slidably connected to the open groove of the lower moving frame.

[0008] Furthermore, an upper slide is slidably connected to the lower end of the fixed frame, a push plate is slidably connected to the slide groove of the guide frame, the upper slide contacts the push plate, two sliding racks are fixedly connected to the bottom of the lower frame, two sliding racks are fixedly connected to the bottom of the upper slide, there are four sliding racks in total, the two sliding racks on the same side form a group, and a rotating gear is rotated on each side of the fixed frame, and the two rotating gears are respectively meshed with the two groups of sliding racks.

[0009] Furthermore, the lateral positioning mechanism includes a limit frame, a fixed rod, a movable rod, a movable rack, a rotating gear and a compression spring. Two limit frames are slidably connected to the lower movable frame, and two limit frames are slidably connected to the upper sliding frame. There are four limit frames in total. Two fixed rods are fixedly connected to one side of the fixed frame, and two movable rods are slidably connected between the two fixed rods. Each movable rod is slidably connected to the two limit frames, and each movable rod is fixedly connected to a movable rack. A rotating gear is rotatably connected to the guide frame, and the rotating gear is meshed with the two movable racks. Two compression springs are fixedly connected between the two fixed rods and one movable rod, respectively.

[0010] Furthermore, the pull-down mechanism includes a clamping rod, a reset spring, a weight, a fixed guide rod and a pull rope, two clamping rods are slidably connected to the laser plate-making machine, each clamping rod is provided with an inclined surface, two reset springs are respectively connected between the laser plate-making machine and the two clamping rods, a weight is slidably connected to each set of fixed guide rods, each weight is provided with a contact groove, and the two clamping rods are respectively in contact with the contact grooves of the two weights;

[0011] One of the weights is fixedly connected to the lower frame, a fixed guide rod is fixedly connected to the top of the fixed frame, a mounting hole is opened on each moving rod, one end of a pull rope is fixedly connected to the mounting hole of one of the moving rods, the pull rope passes through the mounting hole of another moving rod, the other end of the pull rope is fixedly connected to the weight, and the fixed guide rod is in contact with the pull rope.

[0012] Furthermore, the positioning device for the laser direct platemaking machine also includes a pushing mechanism, and the pushing mechanism is provided on the limit frame, the pushing mechanism is used to push the printing plate to move, the pushing mechanism includes a pushing rod, a limiting block, a guide rod, a contact block and an extrusion spring, each limit frame is slidably connected to a pushing rod, each limit frame is fixedly connected to a limiting block, and each limiting block is slidably connected to a guide rod.

[0013] Furthermore, each guide rod is provided with a push groove, and the push grooves of the four guide rods are respectively slidably connected to the four push rods, and each limit frame is slidably connected to a contact block, and the four contact blocks are respectively fixedly connected to the four guide rods, and eight extrusion springs are respectively fixedly connected between the four contact blocks and the four limit frames.

[0014] Furthermore, the positioning device for the laser direct platemaking machine also includes a limiting mechanism. The laser platemaking machine is provided with a limiting mechanism, which is used to limit the printing plate. The limiting mechanism includes a rotating rod, a contact rod, a guide screw rod, a lower pressure plate and a fixed block. There are two rotating rods rotatably connected in the laser platemaking machine, each of which is fixedly connected to four contact rods, and the contact rods on the two rotating rods are arranged in an alternating manner.

[0015] Furthermore, a guide screw rod is fixedly connected to the top of each rotating rod, and each guide screw rod has a threaded groove. A lower pressure plate is slidably connected between the threaded grooves of the two guide screw rods. The lower pressure plate is fixedly connected to the weight block on the pull rope, and two fixed blocks are fixedly connected to the guide frame.

[0016] Furthermore, the positioning device for the laser direct platemaking machine also includes an electric push rod and a friction block, each weight block is fixedly connected to an electric push rod, and a friction block is fixedly connected to the telescopic shaft of each electric push rod.

[0017] The beneficial effects of the positioning device for a laser direct plate-making machine of the present invention are as follows:

[0018] 1. The lower frame, the cover plate and the upper slide will move the printing plate to the middle position in the vertical direction and clamp the printing plate; the limit frame will move the printing plate to the middle position in the horizontal direction and clamp the printing plate, so that the entire printing plate is located in the center of the fixed frame; the lower frame, the cover plate, the upper slide and the limit frame can quickly position and clamp printing plates of various sizes, and position the printing plate in the center of the fixed frame, so that the laser platemaking machine can better process the printing plate at the center of the fixed frame, thereby achieving a better positioning effect on the printing plate.

[0019] 2. The push rod will push the printing plate from the four corners so that the processed side of the printing plate is close to the limit frame, the lower frame and the upper slide frame, so that printing plates of different thicknesses can be positioned, and the processed side of printing plates of different thicknesses can be at the same distance from the laser processing component of the laser platemaking machine, thereby further improving the positioning effect of the printing plate.

[0020] 3. When the printing plate moves downward, it will contact the contact rod and the fixed block, so that when the printing plate is not clamped and positioned, it will be limited by the contact rod and the fixed block, making the printing plate more stable. The movement of the lower frame, the cover plate and the upper slide will clamp the printing plate more stably from the top and bottom directions, thereby enabling the printing plate to be better positioned. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of a cutaway three-dimensional structure of the present invention;

[0023] Figure 3 It is a partial cross-sectional three-dimensional structural schematic diagram of the pull-down mechanism and the limiting mechanism of the present invention;

[0024] Figure 4 It is a partial cross-sectional three-dimensional structural schematic diagram of the present invention;

[0025] Figure 5 It is a partial three-dimensional structural schematic diagram of the vertical positioning mechanism of the present invention;

[0026] Figure 6 It is a partial cross-sectional three-dimensional structural schematic diagram of the vertical positioning mechanism of the present invention;

[0027] Figure 7 It is a partial three-dimensional structural schematic diagram of the vertical positioning mechanism and the horizontal positioning mechanism of the present invention;

[0028] Figure 8 It is a partial three-dimensional structural schematic diagram of the lateral positioning mechanism and the pull-down mechanism of the present invention;

[0029] Fig. 9 It is a partial three-dimensional structural schematic diagram of the lateral positioning mechanism of the present invention;

[0030] Fig.10 It is a partial three-dimensional structural schematic diagram of the lateral positioning mechanism and the limiting mechanism of the present invention;

[0031] Fig.11 It is a partial three-dimensional structural schematic diagram of the pushing mechanism of the present invention;

[0032] Fig.12 It is a partial cross-sectional three-dimensional structural schematic diagram of the pushing mechanism of the present invention;

[0033] Fig.13 It is a three-dimensional structural schematic diagram of the limiting mechanism of the present invention.

[0034] Figure numbers: 1-laser plate-making machine; 2-fixed frame; 21-fixed guide rod; 3-electric slider; 4-reset plate; 5-vertical positioning mechanism; 51-lower frame; 52-guide frame; 53-covering plate; 54-upper slide; 541-push plate; 55-sliding rack; 56-rotating gear; 6-lateral positioning mechanism; 61-limiting frame; 62-fixed rod; 63-moving rod; 64-moving rack; 65-rotating gear; 66- Compression spring; 7-pull-down mechanism; 71-clamp rod; 72-reset spring; 73-weight block; 74-fixed guide rod; 75-pull rope; 8-pushing mechanism; 81-pushing rod; 82-limiting block; 83-guide rod; 84-contact block; 85-extrusion spring; 9-limiting mechanism; 91-rotating rod; 92-contact rod; 93-guide screw rod; 94-down pressure plate; 95-fixed block; 101-electric push rod; 102-friction block. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] Embodiment 1

[0037] In this embodiment, a positioning device for a laser direct plate making machine is provided. Figures 1 to 9 As shown, it includes a laser plate-making machine 1, a fixed frame 2, a fixed guide rod 21, an electric slider 3, a reset plate 4, a vertical positioning mechanism 5, a horizontal positioning mechanism 6 and a pull-down mechanism 7. The laser plate-making machine 1 is connected to the fixed frame 2 by bolts. A feed trough is provided on the laser plate-making machine 1. Four fixed guide rods 21 are welded inside the laser plate-making machine 1. Two fixed guide rods 21 form a group. Each group of fixed guide rods 21 is slidably connected to an electric slider 3. A reset plate 4 is slidably connected between the two groups of fixed guide rods 21. The reset plate 4 is connected to the two electric sliders 3 by bolts. A vertical positioning mechanism 5 is provided on the fixed frame 2. The vertical positioning mechanism 5 positions the printing plate in the vertical direction. A horizontal positioning mechanism 6 is provided on the fixed frame 2. The horizontal positioning mechanism 6 positions the printing plate in the horizontal direction. The laser plate-making machine 1 and the fixed frame 2 are provided with a pull-down mechanism 7. The pull-down mechanism 7 is used to provide power.

[0038] The vertical positioning mechanism 5 includes a lower frame 51, a guide frame 52, a cover plate 53, an upper slide 54, a push plate 541, a sliding rack 55 and a rotating gear 56. The upper end of the fixed frame 2 is slidably connected to the lower frame 51, and a through groove and an open groove are formed on the lower frame 51. A guide frame 52 is welded to one side of the fixed frame 2, and a slide groove and two guide grooves are formed on the guide frame 52. The cover plate 53 is slidably connected between the two guide grooves of the guide frame 52, and the cover plate 53 is slidably connected to the open groove of the lower frame 51. The lower end of the fixed frame 2 is slidably connected to the upper slide 54, and the slide groove of the guide frame 52 is slidably connected to the push plate 541, and the upper slide 54 is in contact with the push plate 541.

[0039] Furthermore, two sliding racks 55 are fixedly connected to the bottom of the lower moving frame 51, and two sliding racks 55 are fixedly connected to the bottom of the upper sliding frame 54. There are four sliding racks 55 in total, and the two sliding racks 55 on the same side form a group. A rotating gear 56 is rotated on both sides of the fixed frame 2, and the two rotating gears 56 are respectively engaged with the two groups of sliding racks 55. The rotating gear 56 and the sliding rack 55 will drive the lower moving frame 51 and the upper sliding frame 54 to move synchronously.

[0040] The lateral positioning mechanism 6 includes a limit frame 61, a fixed rod 62, a mobile rod 63, a mobile rack 64, a rotating gear 65 and a compression spring 66. Two limit frames 61 are slidably connected to the lower moving frame 51, and two limit frames 61 are slidably connected to the upper slide 54. There are four limit frames 61 in total. Two fixed rods 62 are fixedly connected to one side of the fixed frame 2. Two mobile rods 63 are slidably connected between the two fixed rods 62. Each mobile rod 63 is slidably connected to the two limit frames 61, and a mobile rack 64 is welded to each mobile rod 63. A rotating gear 65 is rotatably connected to the guide frame 52. The rotating gear 65 meshes with the two mobile racks 64. The rotating gear 65 and the two mobile racks 64 make the mobile rods 63 move synchronously. Two compression springs 66 are fixedly connected between the two fixed rods 62 and one mobile rod 63.

[0041] The pull-down mechanism 7 includes a clamping rod 71, a reset spring 72, a weight 73, a fixed guide rod 74 and a pull rope 75. Two clamping rods 71 ​​are slidably connected to the laser platemaking machine 1. Each clamping rod 71 is provided with an inclined surface. Two reset springs 72 are respectively connected between the laser platemaking machine 1 and the two clamping rods 71. A weight 73 is slidably connected to each set of fixed guide rods 21. The material of the weight 73 is lead.

[0042] A contact groove is provided on each weight block 73, and two clamping rods 71 ​​are in contact with the contact grooves of the two weight blocks 73 respectively. One of the weight blocks 73 is connected to the lower moving frame 51 by bolts, and a fixed guide rod 74 is welded to the top of the fixed frame 2. A mounting hole is provided on each moving rod 63, and one end of a pull rope 75 is fixedly connected to the mounting hole of one of the moving rods 63. The pull rope 75 passes through the mounting hole of the other moving rod 63, and the other end of the pull rope 75 is fixedly connected to the weight block 73, and the fixed guide rod 74 is in contact with the pull rope 75.

[0043] In actual use, the steps for using the positioning device for a laser direct platemaking machine in this embodiment can be as follows: first, the staff puts the printing plate into the laser platemaking machine 1 against the side wall of the feed slot of the laser platemaking machine 1, and the printing plate moves downward against the side wall of the feed slot of the laser platemaking machine 1. The printing plate moves downward and passes through the through slot of the lower frame 51. The printing plate continues to move downward and contacts the two limit frames 61 on the same side. The printing plate contacts the upper slide 54 and stops moving. Then, the staff pushes one of the clamping rods 71, and the movement of one of the clamping rods 71 ​​compresses the reset spring 72, and the movement of one of the clamping rods 71 ​​disengages from one of the weights 73, and one of the weights 73 moves downward under the action of gravity. Then, the staff releases the clamping rod 71, and the clamping rod 71 is reset under the drive of the reset spring 72, and the downward movement of one of the weights 73 drives the lower frame 51 to move downward, and the downward movement of the lower frame 51 drives the cover plate 53, the two limit frames 61 and the two sliding racks 55 to move downward.

[0044] The downward movement of the covering plate 53 will squeeze the guide groove of the guide frame 52 and make the covering plate 53 move toward the lower frame 51. The movement of the covering plate 53 toward the lower frame 51 will block the through groove of the lower frame 51. The downward movement of the two sliding racks 55 will make the two rotating gears 56 rotate. The rotation of the two rotating gears 56 will drive the other two sliding racks 55 to move upward. The upward movement of the other two sliding racks 55 will drive the upper slide 54, the two limit frames 61 and the push plate 541 to move upward.

[0045] The upper slide 54 and the push plate 541 move upward, which will drive the printing plate to move upward. The printing plate will contact the cover plate 53 when it moves upward. The weight 73, the lower frame 51, the cover plate 53, the upper slide 54, the push plate 541 and the sliding rack 55 will all stop moving. The lower frame 51, the cover plate 53 and the upper slide 54 will move the printing plate to the middle position in the vertical direction and clamp the printing plate. Then the staff pushes another clamping rod 71. The movement of the other clamping rod 71 will compress the reset spring 72, and the other clamping rod 71 will disengage from the other weight 73.

[0046] Then, the staff releases the other clamping rod 71, and the other clamping rod 71 is reset under the drive of the reset spring 72, and the other weight block 73 moves downward under the action of gravity. The downward movement of the weight block 73 will drag one end of the pull rope 75 to move downward, and the other end of the pull rope 75 will drive one of the moving rods 63 to move, and the movement of one of the moving rods 63 will cause the compression spring 66 to compress. The movement of one of the moving rods 63 will drive one of the moving racks 64 and two limit frames 61 to move, and the movement of one of the moving racks 64 will cause the rotating gear 65 to rotate, and the rotation of the rotating gear 65 will drive another moving rack 64 to move, and the movement of another moving rack 64 will drive another moving rod 63 to move, and the movement of another moving rod 63 will drive the other two limit frames 61 to move, and the two moving rods 63 and the four limit frames 61 move in a direction close to each other, and the movement of two of the limit frames 61 will push the printing plate to move, and the movement of the printing plate will contact the other two limit frames 61.

[0047] Then, the limit frame 61, the moving rod 63, the moving rack 64, the weight 73 and the pull rope 75 stop moving, and the limit frame 61 will move the printing plate to the middle position in the horizontal direction and clamp the printing plate, so that the entire printing plate is located in the center of the fixed frame 2, and then the laser platemaking machine 1 processes the printing plate. After the processing is completed, the staff starts the electric slider 3, and the electric slider 3 will drive the reset plate 4 to move upward. The reset plate 4 moves upward and contacts with the push plate 541. The reset plate 4 continues to move upward to push the push plate 541 to move upward, and the push plate 541 moves upward to drive the printing plate to move upward.

[0048] The upward movement of the printing plate will drive the covering plate 53, the two limit frames 61, the two sliding racks 55, the lower frame 51 and one of the weights 73 to move upward, the two sliding racks 55 will drive the other two sliding racks 55 to move downward by rotating the gear 56, the other two sliding racks 55 will move downward and drive the upper slide 54 to reset downward, and the downward reset of the upper slide 54 will drive the two limit frames 61 to reset downward. The cover plate 53 moves upward and is squeezed by the guide groove of the guide frame 52, causing the cover plate 53 to move in the direction away from the lower frame 51. One of the weight blocks 73 moves upward and contacts the inclined surface of the clamping rod 71. One of the weight blocks 73 continues to move upward and squeezes the clamping rod 71 to move. The movement of the clamping rod 71 compresses the reset spring 72. One of the weight blocks 73 moves upward and disengages the weight block 73 from contacting the clamping rod 71. The clamping rod 71 is reset under the drive of the reset spring 72. The clamping rod 71 contacts the contact groove of the weight block 73. The push plate 541 continues to move upward and drives the printing plate to move out through the through groove of the lower frame 51 and the feed slot of the laser platemaking machine 1.

[0049] Then, the staff will take away the processed printing plate, and at the same time, the reset plate 4 will move upward to contact with another weight block 73, and the reset plate 4 will move upward to push the other weight block 73 to move upward, and the other weight block 73 will move upward to make one end of the pull rope 75 move upward, so that the pull rope 75 no longer tightens one of the moving rods 63, and the compression spring 66 will drive one of the moving rods 63 to reset, and the reset of one of the moving rods 63 will drive the other end of the pull rope 75 to move, and the reset of the moving rod 63 will drive the limit frame 61 and the moving rack 64 to reset.

[0050] The reset of the moving rack 64 will drive the other moving rack 64 to reset through the rotating gear 65. The reset of the other moving rack 64 will drive the other moving rod 63 and the limit frame 61 to reset. The upward movement of the other weight block 73 will contact the card rod 71 and push the card rod 71 to move. The movement of the card rod 71 compresses the reset spring 72. The other weight block 73 continues to move upward and disengages from the card rod 71. The card rod 71 will be reset under the drive of the reset spring 72 and will contact the contact groove of the weight block 73.

[0051] Then, the electric slider 3 and the reset plate 4 move downward, and the push plate 541 resets downward under the action of gravity. After the reset is completed, the staff closes the electric slider 3, and the lower frame 51, the cover plate 53, the upper slide 54 and the limit frame 61 can quickly position and clamp printing plates of various sizes, and position the printing plate at the center of the fixed frame 2, so that the laser platemaking machine 1 can better process the printing plate at the center of the fixed frame 2, thereby achieving a better positioning effect on the printing plate.

[0052] Embodiment 2

[0053] The positioning device for the laser direct plate-making machine of this embodiment is based on the first embodiment. Figures 10 to 12 As shown, a pushing mechanism 8 is also included. Specifically, the limiting frame 61 is provided with a pushing mechanism 8, which is used to push the printing plate to move. The pushing mechanism 8 includes a pushing rod 81, a limiting block 82, a guide rod 83, a contact block 84 and a pressing spring 85. Each limiting frame 61 is slidably connected with a pushing rod 81, which is used to push the printing plate. A limiting block 82 is welded to each limiting frame 61.

[0054] Furthermore, each limiting block 82 is slidably connected to a guide rod 83, each guide rod 83 is provided with a push groove, the push grooves of the four guide rods 83 are respectively slidably connected to the four push rods 81, each limiting frame 61 is slidably connected to a contact block 84, the four contact blocks 84 are respectively welded to the four guide rods 83, and eight extrusion springs 85 are fixedly connected between the four contact blocks 84 and the four limiting frames 61.

[0055] The limit frame 61 will drive the push rod 81, the limit block 82, the guide rod 83, the contact block 84 and the extrusion spring 85 to move. The movement of the contact block 84 will contact the side of the printing plate, causing the contact block 84 and the guide rod 83 to stop moving. The limit frame 61 continues to move, which will drive the push rod 81 and the limit block 82 to continue to move. The limit frame 61 continues to move, causing the extrusion spring 85 to be compressed.

[0056] Continuing to move the push rod 81 will cause the push rod 81 to squeeze the push groove of the guide rod 83 and move the push rod 81 toward the printing plate. The push rod 81 will push the printing plate from the four corners so that the processed side of the printing plate is close to the limit frame 61, the lower frame 51 and the upper slide 54, so that printing plates of different thicknesses can be positioned, and the processed side of printing plates of different thicknesses can be at the same distance from the laser processing component of the laser platemaking machine 1, thereby further improving the positioning effect of the printing plate.

[0057] Then, the push rod 81 stops moving, causing the limit frame 61 and the limit block 82 to stop moving. After the processing is completed, the reset of the limit frame 61 will drive the push rod 81, the limit block 82, the guide rod 83, the contact block 84 and the extrusion spring 85 to reset. The push rod 81 and the contact block 84 are out of contact with the printing plate. The contact block 84 moves driven by the extrusion spring 85. The movement of the contact block 84 will drive the guide rod 83 to reset. The reset of the guide rod 83 will drive the push rod 81 to reset.

[0058] Embodiment 3

[0059] The positioning device for the laser direct plate-making machine of this embodiment is based on the second embodiment. Figures 3 to 13 As shown, it also includes a limiting mechanism 9, which is used to limit the printing plate. The limiting mechanism 9 includes a rotating rod 91, a contact rod 92, a guide screw rod 93, a lower pressure plate 94 and a fixed block 95. Two rotating rods 91 are rotatably connected in the laser platemaking machine 1, and four contact rods 92 are welded to each rotating rod 91. The contact rods 92 are used to limit the printing plate. The contact rods 92 on the two rotating rods 91 are arranged in a staggered manner. A guide screw rod 93 is welded to the top of each rotating rod 91, and a thread groove is opened on each guide screw rod 93. A lower pressure plate 94 is slidably connected between the thread grooves of the two guide screw rods 93. The lower pressure plate 94 is welded to the weight block 73 on the pull rope 75, and two fixed blocks 95 are connected to the guide frame 52 by bolts.

[0060] In actual use, the steps for using the positioning device for the laser direct platemaking machine in this embodiment can be as follows: first, the staff puts the printing plate into the laser platemaking machine 1 through the feed slot of the laser platemaking machine 1, and the printing plate moves downward to contact the contact rod 92 and the fixed block 95, so that when the printing plate is not clamped and positioned, it will be limited by the contact rod 92 and the fixed block 95, making the printing plate more stable, and the movement of the lower frame 51, the cover plate 53 and the upper slide 54 will clamp the printing plate more stably from the top and bottom directions, thereby allowing the printing plate to be better positioned.

[0061] When the weight block 73 connected to the pull rope 75 moves, the weight block 73 will drive the lower pressure plate 94 to move downward. The downward movement of the lower pressure plate 94 will squeeze the threaded groove of the guide screw rod 93 to rotate the guide screw rod 93. The rotation of the guide screw rod 93 will drive the rotating rod 91 and the contact rod 92 to rotate. The rotation of the contact rod 92 will prevent the contact rod 92 from interfering with the operation of the laser processing component of the laser platemaking machine 1. After the processing is completed, the weight block 73 connected to the pull rope 75 will be reset, which will drive the lower pressure plate 94 to reset. The reset of the lower pressure plate 94 will cause the rotating rod 91, the contact rod 92 and the guide screw rod 93 to rotate and reset.

[0062] Embodiment 4

[0063] The positioning device for the laser direct plate-making machine of this embodiment is based on the third embodiment. Figure 5 As shown, the positioning device for the laser plate-making machine also includes an electric push rod 101 and a friction block 102 . Each weight block 73 is connected to an electric push rod 101 via bolts, and a friction block 102 is fixedly connected to the telescopic shaft of each electric push rod 101 .

[0064] In actual use, the steps for using the positioning device for the laser direct platemaking machine in this embodiment can be as follows: the movement of the weight block 73 will drive the electric push rod 101 and the friction block 102 to move. After the positioning is completed, the staff starts the electric push rod 101, and the extension of the telescopic shaft of the electric push rod 101 will drive the friction block 102 to move. The movement of the friction block 102 will contact the inner wall of the laser platemaking machine 1. The movement of the friction block 102 continues to cause a slight displacement of the weight block 73 and the electric push rod 101, so that the weight block 73 is clamped with the fixed guide rod 21, and the weight block 73 will not apply force to the printing plate through the lower frame 51, the pull rope 75 and the moving rod 63.

[0065] Then the staff turns off the electric push rod 101. After completing the processing of the printing plate, the staff restarts the electric push rod 101. The contraction of the telescopic rod of the electric push rod 101 will drive the friction block 102 to move. The movement of the friction block 102 will disengage from the inner wall of the laser platemaking machine 1. Then the staff turns off the electric push rod 101, and the weight block 73 will drive the electric push rod 101 and the friction block 102 to reset.

[0066] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A positioning device for a laser direct plate-making machine, characterized in that: The laser plate-making machine (1) comprises a fixed frame (2), a fixed guide rod (21), an electric slider (3), a reset plate (4), a vertical positioning mechanism (5), a horizontal positioning mechanism (6) and a pull-down mechanism (7). The fixed frame (2) is fixedly connected inside the laser plate-making machine (1). A feed slot is provided on the laser plate-making machine (1). Four fixed guide rods (21) are fixedly connected inside the laser plate-making machine (1). Two fixed guide rods (21) form a group. Each group of fixed guide rods (21) is slidably connected to an electric slider (3). A reset plate (4) is slidably connected between the two groups of fixed guide rods (21), the reset plate (4) is fixedly connected to the two electric slide blocks (3), a vertical positioning mechanism (5) and a horizontal positioning mechanism (6) are also provided on the fixed frame (2), and a pull-down mechanism (7) is provided on the laser platemaking machine (1) and the fixed frame (2).

2. A positioning device for a laser direct plate-making machine according to claim 1, characterized in that: The vertical positioning mechanism (5) comprises a lower moving frame (51), a guide frame (52), a cover plate (53), an upper slide frame (54), a push plate (541), a sliding rack (55) and a rotating gear (56); the upper end of the fixed frame (2) is slidably connected to the lower moving frame (51); a through groove and an open groove are formed on the lower moving frame (51); one side of the fixed frame (2) is fixedly connected to the guide frame (52); a slide groove and two guide grooves are formed on the guide frame (52); a cover plate (53) is slidably connected between the two guide grooves of the guide frame (52); and the cover plate (53) is slidably connected to the open groove of the lower moving frame (51).

3. A positioning device for a laser direct plate-making machine according to claim 2, characterized in that: The lower end of the fixed frame (2) is slidably connected with an upper slide frame (54), the slide groove of the guide frame (52) is slidably connected with a push plate (541), the upper slide frame (54) contacts the push plate (541), the bottom of the lower frame (51) is fixedly connected with two sliding racks (55), the bottom of the upper slide frame (54) is fixedly connected with two sliding racks (55), there are four sliding racks (55) in total, two sliding racks (55) on the same side form a group, and two rotating gears (56) are rotatably provided on both sides of the fixed frame (2), and the two rotating gears (56) are respectively meshed with the two groups of sliding racks (55).

4. The positioning device for a laser direct plate-making machine according to claim 3, characterized in that: The lateral positioning mechanism (6) comprises a limit frame (61), a fixed rod (62), a moving rod (63), a moving rack (64), a rotating gear (65) and a compression spring (66); two limit frames (61) are slidably connected to the lower moving frame (51); two limit frames (61) are slidably connected to the upper sliding frame (54); there are four limit frames (61); one side of the fixed frame (2) is fixedly connected to two fixed rods (62); two moving rods (63) are slidably connected between the two fixed rods (62); each moving rod (63) is slidably connected to the two limit frames (61); each moving rod (63) is fixedly connected to a moving rack (64); a rotating gear (65) is rotatably connected to the guide frame (52); the rotating gear (65) is meshed with the two moving racks (64); and two compression springs (66) are fixedly connected between the two fixed rods (62) and one moving rod (63), respectively.

5. The positioning device for a laser direct plate-making machine according to claim 4, characterized in that: The pull-down mechanism (7) comprises a clamping rod (71), a return spring (72), a weight (73), a fixed guide rod (74) and a pull rope (75); two clamping rods (71) are slidably connected to the laser plate-making machine (1); each clamping rod (71) is provided with an inclined surface; two return springs (72) are respectively connected between the laser plate-making machine (1) and the two clamping rods (71); a weight (73) is slidably connected to each set of fixed guide rods (21); each weight (73) is provided with a contact groove; the two clamping rods (71) are respectively in contact with the contact grooves of the two weights (73); One of the weight blocks (73) is fixedly connected to the lower moving frame (51), and a fixed guide rod (74) is fixedly connected to the top of the fixed frame (2). A mounting hole is opened on each moving rod (63), and one end of a pull rope (75) is fixedly connected to the mounting hole of one moving rod (63). The pull rope (75) passes through the mounting hole of another moving rod (63), and the other end of the pull rope (75) is fixedly connected to the weight block (73), and the fixed guide rod (74) is in contact with the pull rope (75).

6. The positioning device for a laser direct plate-making machine according to claim 5, characterized in that: The positioning device for the laser direct platemaking machine also includes a pushing mechanism (8), the pushing mechanism (8) is provided on the limiting frame (61), the pushing mechanism (8) includes a pushing rod (81), a limiting block (82), a guiding rod (83), a contact block (84) and a pressing spring (85), each limiting frame (61) is slidably connected to a pushing rod (81), each limiting frame (61) is fixedly connected to a limiting block (82), and each limiting block (82) is slidably connected to a guiding rod (83).

7. The positioning device for a laser direct plate-making machine according to claim 6, characterized in that: Each guide rod (83) is provided with a pushing groove, and the pushing grooves of the four guide rods (83) are respectively slidably connected to the four pushing rods (81), and each limiting frame (61) is slidably connected to a contact block (84), and the four contact blocks (84) are respectively fixedly connected to the four guide rods (83), and eight extrusion springs (85) are respectively fixedly connected between the four contact blocks (84) and the four limiting frames (61).

8. The positioning device for a laser direct plate-making machine according to claim 5, characterized in that: The laser plate-making machine (1) also includes a limiting mechanism (9). The laser plate-making machine (1) is provided with the limiting mechanism (9). The laser plate-making machine (1) is used to limit the printing plate. The limiting mechanism (9) includes a rotating rod (91), a contact rod (92), a guide screw rod (93), a lower pressure plate (94) and a fixed block (95). Two rotating rods (91) are rotatably connected in the laser plate-making machine (1). Four contact rods (92) are fixedly connected to each rotating rod (91). The contact rods (92) on the two rotating rods (91) are arranged in a staggered manner.

9. The positioning device for a laser direct plate-making machine according to claim 8, characterized in that: A guide screw rod (93) is fixedly connected to the top of each rotating rod (91), and each guide screw rod (93) is provided with a thread groove. A lower pressing plate (94) is slidably connected between the thread grooves of the two guide screw rods (93), and the lower pressing plate (94) is fixedly connected to the weight block (73) on the pull rope (75). Two fixed blocks (95) are fixedly connected to the guide frame (52).

10. The positioning device for a laser direct plate-making machine according to claim 5, characterized in that: The positioning device for the laser direct plate-making machine also includes an electric push rod (101) and a friction block (102), each weight block (73) is fixedly connected to an electric push rod (101), and a friction block (102) is fixedly connected to the telescopic shaft of each electric push rod (101).

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