A paper gripper row structure

Abstract

The present invention provides a paper gripping tooth bar structure, comprising a front arc guide rail, a lower straight guide rail, a rear arc guide rail, an upper straight guide rail, and a roller chain, wherein a plurality of paper gripping tooth bars are further provided on the roller chain; the paper gripping tooth bar comprises a tooth bar body, wherein a plurality of fixed tooth plates are equidistantly distributed, the tooth bar body is further provided with a movable tooth plate covering the fixed tooth plate, the movable tooth plate is provided with an opening tooth column facing the fixed tooth plate, and each movable tooth plate is connected to an opening tooth connecting plate on the side facing away from the fixed tooth plate, and both ends of the opening tooth connecting plate are provided with a contact plate extending outward to approach the roller chain, and both ends of the tooth bar body are further provided with a support member, and a circumferential driving device is provided on the support member, and the circumferential driving direction of the circumferential driving device is perpendicular to the length direction of the tooth bar body, and the output end of the circumferential driving device is provided with a linear driving device, and the linear driving direction of the linear driving device is perpendicular to the length direction of the tooth bar body.

Description

Technical Field

[0001] The present invention relates to the technical field of printing press structures, in particular to a paper gripper row structure. Background Art

[0002] The gripper bar plays the role of conveying paper in the printing press, and the paper contacts the impression cylinder during the conveying process of the gripper bar to complete the printing. The gripper bar is connected to the circulating roller chain in the printing equipment, such as Figure 1 As shown, only half of the structure is shown in the figure, and a number of paper gripper rows (B) are provided on the roller chain (A) to achieve efficient transmission and printing.

[0003] One of the gripper rows consists of several equally spaced grippers, which hold the paper in place. Printing is accomplished while the paper is being conveyed by these grippers. If all grippers hold the paper securely, wrinkles are unlikely to form during conveyance, resulting in acceptable print quality. However, if one gripper fails to hold the paper securely, the distance between adjacent grippers increases, increasing the chances that wrinkles will form between adjacent grippers, reducing print quality.

[0004] Secondly, industrial printing presses are highly efficient, printing dozens or even hundreds of sheets per minute. However, if a gripper fails to clamp properly, there is currently no way to detect this. The only way to determine this is by analyzing the print quality of the paper and then troubleshooting. This can result in a large batch of waste paper, causing economic losses. Summary of the Invention

[0005] The present invention aims to solve the above technical problems and provides a paper gripper bar structure.

[0006] The technical solution of the present invention is a paper gripper bar structure, comprising a front circular arc guide rail, a lower straight guide rail, a rear circular arc guide rail, an upper straight guide rail and a roller chain arranged in each guide rail, which are sequentially connected in a long waist shape, a driving sprocket is provided in the front circular arc guide rail, a driven sprocket is provided in the rear circular arc guide rail, the driving sprocket and the driven sprocket are connected through the roller chain transmission, and a plurality of paper gripper bars are further provided on the roller chain; the paper gripper bar comprises a bar body, a plurality of fixed teeth are provided on the bar body, a movable tooth piece covering the fixed tooth piece is further provided on the bar body, and the movable tooth piece The plate is provided with an opening column facing the fixed tooth plate, and each movable tooth plate is connected to an opening connecting plate on the side facing away from the fixed tooth plate, and both ends of the opening connecting plate are provided with contact plates extending outward to close to the roller chain, and both ends of the tooth row body are also provided with support members. A circumferential drive device is provided on the support member, and the circumferential drive direction of the circumferential drive device is perpendicular to the length direction of the tooth row body. A linear drive device is provided at the output end of the circumferential drive device, and the linear drive direction of the linear drive device is perpendicular to the length direction of the tooth row body; the output ends of the two linear drive devices are provided with There is a clamping row assembly, which includes a clamping bar seat along the length direction of the tooth bar body, and a plurality of clamping grooves corresponding to the plurality of movable teeth are opened on the clamping bar seat, the length direction of the clamping groove is parallel to the length direction of the clamping bar seat, and a clamping block that can slide along its length direction is provided in the clamping groove, one end of the clamping block is connected to one end of the clamping groove through a clamping row spring, and the other end of the clamping block is connected to a tensile strain gauge, and the clamping row assembly also includes an L-shaped connecting plate connected to the end of the clamping bar seat on one side, and a transverse movement hole along the length direction of the clamping bar seat is opened on the other side of the connecting plate. A connecting block that can slide along its length direction is provided in the transverse movement hole, and the connecting block is connected to one end of the transverse movement hole by a connecting spring, and the connecting block is connected to the output end of the linear drive device; the upper straight guide rails on both sides are provided with contact rails, and when the paper gripper row passes through the contact rails, the contact plate contacts the contact rails and the paper gripper row is kept in an open state through the opening connecting plate, and the upper straight guide rail on one side is also provided with a contact block, and when the paper gripper row passes through the contact block, the connecting plate on one side contacts the contact block to cause the clamping row assembly to move horizontally.

[0007] As an embodiment, the tooth row body is provided with a stepped high surface and a low surface, the movable tooth piece is installed on the high surface, and the fixed tooth piece is installed on the low surface.

[0008] As an embodiment, a tooth opening hole is opened on the fixed tooth plate, and when the movable tooth plate is tightly attached to the fixed tooth plate, the tooth opening hole is used for the tooth opening column to pass through.

[0009] As an embodiment, a reinforcing spring is provided on the movable tooth piece, and the reinforcing spring and the movable tooth piece are mounted on the high surface via a pressure plate.

[0010] As an embodiment, a sunken groove is formed between the open-tooth connecting plate and the contact plate, and the sunken groove provides a space for the linear drive device to make way when the linear drive device is circumferentially driven by the circumferential drive device.

[0011] As an embodiment, an electrical box is provided on the clamping bar seat, and a power supply and a control module are integrated in the electrical box. Each of the tensile strain gauges is led to the electrical box through a bus and connected to the control module. The circumferential drive device, the linear drive device and the tensile strain gauge are all powered by the power supply in the electrical box.

[0012] As an embodiment, the contact rail includes a straight rail plate and an inclined rail plate connected to each other, the inclined rail plate is located at the rear end of the straight rail plate, and the inclined rail plate is inclined upward relative to the straight rail plate; when the paper gripper row returns from the rear arc guide rail to the front arc guide rail, the contact plate contacts the inclined rail plate to open the paper gripper row, and in the process of the contact plate moving forward against the straight rail plate, the paper gripper row remains in an open state.

[0013] As an embodiment, the contact rail further includes a side plate connected to the outer side of the straight rail plate, and the side plate is also connected to the outer side of the upper straight guide rail.

[0014] As an embodiment, two inner ends of the contact block are provided with contact surfaces inclined relative to the length direction of the upper straight guide rail.

[0015] As an embodiment, chain rollers are provided at both ends of the gripper bar body, and the gripper bar is connected to the roller chain via the chain rollers.

[0016] The beneficial effect of the present invention compared with the prior art is that, by setting a clamping row assembly, since a plurality of clamping blocks and a plurality of paper gripper rows correspond one to one, by making the paper gripper rows open, that is, opening the movable teeth relative to the fixed teeth, the clamping blocks of the clamping row assembly are placed in the clamping of the movable teeth and the fixed teeth, simulating the process of paper being clamped by the movable teeth and the fixed teeth. Each clamping block has an independent clamping groove, and one end of the clamping groove (20) is connected to the clamping row spring. Therefore, in the process of the clamping row assembly being moved horizontally, any movable teeth that cannot normally provide clamping force can be immediately detected by the corresponding tensile strain gauge. Because the horizontal movement hole and the connecting block are provided in the connecting plate, the clamping row assembly can be made to move horizontally by contacting one end of the connecting plate. When no detection is performed, the clamping row assembly is stored above the paper gripper row. When detection is required, the clamping row assembly is first driven by the circumferential drive device to be shifted from the top of the paper gripper row to the front of the paper gripper row, that is, the position where the teeth of the movable teeth and the fixed teeth are located. Then, driven by the linear drive, the clamping assembly moves from the front of the gripper bar into the movable and fixed teeth. Because each movable tooth is connected to an opening plate on the side facing away from the fixed teeth, all the movable and fixed teeth can be opened simultaneously by contacting the contact plate. The contact rail has a certain length, so while the gripper bar remains in the open position—that is, while it passes over the contact rail—the aforementioned circular and linear drive mechanisms drive the clamping assembly. Next, through contact with the contact block located closer to the front circular guide rail, the entire clamping assembly moves laterally, detecting whether any loose movable teeth are present. After passing the contact block, the linear and circular drive mechanisms reset the clamping assembly. Thus, when the gripper bar, along with the roller chain, returns from the rear circular guide rail via the upper straight guide rail to the front circular guide rail, the aforementioned action allows each movable tooth to be detected for looseness. Therefore, detection can be performed after all gripper bars have conveyed paper. This will improve printing quality and reduce waste paper rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of the gripper bar structure mentioned in the background technology;

[0018] Figure 2 A schematic structural diagram of a gripper bar structure provided in an embodiment of the present invention;

[0019] Figure 3 A schematic structural diagram of a gripper bar provided in an embodiment of the present invention;

[0020] Figure 4 A first partial enlarged view of the gripper bar provided in an embodiment of the present invention;

[0021] Figure 5A second partial enlarged view of the gripper bar provided in an embodiment of the present invention;

[0022] Figure 6 A partially enlarged view of the upper straight guide rail provided in an embodiment of the present invention.

[0023] In the figure: 1. front arc guide rail; 2. lower straight guide rail; 3. rear arc guide rail; 4. upper straight guide rail; 5. roller chain; 6. driving sprocket; 7. driven sprocket; 8. paper gripper bar; 9. gripper bar body; 10. fixed tooth piece; 11. movable tooth piece; 12. opening tooth column; 13. opening tooth connecting plate; 14. contact plate; 15. support member; 16. circular drive device; 17. linear drive device; 18. clamping bar assembly; 19. clamping bar seat; 20. clamping groove; 21 , clamping block; 22. Clamping spring; 23. Tensile strain gauge; 24. Connecting plate; 25. Transverse hole; 26. Connecting block; 27. Connecting spring; 28. Contact rail; 29. ​​Contact block; 30. High surface; 31. Low surface; 32. Threaded hole; 33. Reinforcement spring; 34. Pressure plate; 35. Sinking groove; 36. Electrical box; 37. Bus; 38. Straight track plate; 39. Inclined track plate; 40. Side plate; 41. Contact surface; 42. Chain roller. DETAILED DESCRIPTION

[0024] The above and other embodiments and advantages of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments.

[0025] In one embodiment, Figure 2-4 shown.

[0026] The paper gripper bar structure provided in this embodiment includes a front arc guide rail 1, a lower straight guide rail 2, a rear arc guide rail 3, an upper straight guide rail 4 and a roller chain 5 arranged in each guide rail, which are connected in sequence. A driving sprocket 6 is provided in the front arc guide rail 1, and a driven sprocket 7 is provided in the rear arc guide rail 3. The driving sprocket 6 and the driven sprocket 7 are connected through the roller chain 5. A plurality of paper gripper bars 8 are also provided on the roller chain 5; the paper gripper bar 8 includes a bar body 9, and a plurality of fixed teeth 10 are equidistantly distributed on the bar body 9. The bar body 9 is also provided with a movable tooth 11 covering the fixed tooth 10, and the movable tooth 11 is provided with a tooth facing in the direction of rotation. The tooth column 12 of the fixed tooth piece 10, each movable tooth piece 11 is connected to a tooth connecting plate 13 on the side facing away from the fixed tooth piece 10, and both ends of the tooth connecting plate 13 are provided with a contact plate 14 extending outward to close to the roller chain 5. Both ends of the tooth bar body 9 are also provided with a support member 15, and a circumferential drive device 16 is provided on the support member 15. The circumferential drive direction of the circumferential drive device 16 is perpendicular to the length direction of the tooth bar body 9. The output end of the circumferential drive device 16 is provided with a linear drive device 17, and the linear drive direction of the linear drive device 17 is perpendicular to the length direction of the tooth bar body 9; the output ends of the two linear drive devices 17 are provided with a clamping assembly 18, the clamping assembly 18 includes a clamping seat 19 along the length direction of the tooth row body 9, and the clamping seat 19 is provided with a plurality of clamping grooves 20 corresponding to the plurality of movable teeth 11. The length direction of the clamping groove 20 is parallel to the length direction of the clamping seat 19. A clamping block 21 that can slide along its length direction is provided in the clamping groove 20. One end of the clamping block 21 is connected to one end of the clamping groove 20 through a clamping spring 22, and the other end of the clamping block 21 is connected to a tensile strain gauge 23. The clamping assembly 18 also includes an L-shaped connecting plate 24 connected to the end of the clamping seat 19 on one side, and the other side of the connecting plate 24 is provided with a horizontal cross section along the length direction of the clamping seat 19. A shift hole 25 is provided in the transverse shift hole 25, and a connecting block 26 that can slide along its length direction is provided in the transverse shift hole 25, and the connecting block 26 is connected to one end of the transverse shift hole 25 through a connecting spring 27, and the connecting block 26 is connected to the output end of the linear drive device 17; the upper straight guide rails 4 on both sides are provided with contact rails 28, when the paper gripper row 8 passes through the contact rails 28, the contact plate 14 contacts the contact rails 28 and the paper gripper row 8 is kept in an open state through the open tooth connecting plate 13, and the upper straight guide rail 4 on one side is also provided with a contact block 29, when the paper gripper row 8 passes through the contact block 29, the connecting plate 24 on one side contacts the contact block 29 to cause the clamping row assembly 18 to move laterally.

[0027] In this embodiment, first look at Figure 3, that is, the clamping assembly 18, since the plurality of clamping blocks 21 correspond to the plurality of paper gripper rows 8 one-to-one, by opening the paper gripper rows 8, that is, opening the movable teeth 11 relative to the fixed teeth 10, and then placing the clamping blocks 21 of the clamping assembly 18 in the clamping state between the movable teeth 11 and the fixed teeth 10, the process of paper being clamped by the movable teeth 11 and the fixed teeth 10 is simulated. Each clamping block 21 has an independent clamping groove 20, and one end of the clamping groove 20 is connected by a clamping spring 22. Therefore, when the clamping assembly 18 is moved horizontally as a whole, any movable teeth 11 that cannot provide normal clamping force can be immediately detected by the corresponding tensile strain gauge 23. Because the connecting plate 24 is provided with a lateral displacement hole 25 and a connecting block 26, the clamping assembly 18 can be moved horizontally as a whole by contacting one end of the connecting plate 24.

[0028] When no detection is being performed, the clamping assembly 18 is stored above the paper gripper row 8. When detection is required, first, under the drive of the circumferential drive device 16, the clamping assembly 18 is shifted from the top of the paper gripper row 8 to the front of the paper gripper row 8, that is, the position of the teeth of the movable tooth piece 11 and the fixed tooth piece 10. Then, under the drive of the linear drive device 17, the clamping assembly 18 is moved from the front of the paper gripper row 8 to the inside of the movable tooth piece 11 and the fixed tooth piece 10. Of course, the realization of this action requires the paper gripper row 8 to maintain an open tooth state. Since the side of each movable tooth piece 11 facing away from the fixed tooth piece 10 is connected to an open tooth connecting plate 13, when the paper gripper row 8 is in Figure 3 In the position shown, all the movable teeth 11 and the fixed teeth 10 can be opened simultaneously by contacting the lower side of the contact plate 14. However, this action is performed when the paper gripper bar 8 is on the upper straight guide rail 4. Therefore, the contact rail 28 provided on the upper straight guide rail 4 contacts the upper side of the contact plate 14 to simultaneously open the teeth of all the movable teeth 11 and the fixed teeth 10.

[0029] The contact rail 28 has a certain track length, so while the gripper bar 8 remains in the open position, that is, while it passes over the contact rail 28, the aforementioned drive of the clamping assembly 18 by the circumferential drive 16 and the linear drive 17 is completed during this period. Next, through contact with the contact block 29 located closer to the front circular guide rail 1, the clamping assembly 18 as a whole moves laterally, thereby detecting whether any movable teeth 11 are loose. After passing the contact block 29, the linear drive 17 and the circumferential drive 16 reset the clamping assembly 18. This reset process does not require all movable teeth 11 and fixed teeth 10 to open.

[0030] In summary, when the paper gripper row 8 follows the roller chain 5 from the front arc guide rail 1 via the lower straight guide rail 2 to the rear arc guide rail 3, the process of conveying paper for printing is no different from the traditional paper gripper row structure. When the paper gripper row 8 follows the roller chain 5 from the rear arc guide rail 3 via the upper straight guide rail 4 back to the front arc guide rail 1, that is, through the above-mentioned action, each movable tooth piece 11 is tested to see if it is loose. Therefore, after all the paper gripper rows 8 convey the paper, they can be tested. This improves the printing quality and reduces the waste paper rate. In this embodiment, the circumferential drive device 16 and the linear drive device 17 can be a micro rotary motor and a micro linear motor, both of which draw power from the electrical box 36.

[0031] In one embodiment, Figure 3 shown.

[0032] The gripper bar structure provided in this embodiment has a gripper bar body 9 with a stepped high surface 30 and a low surface 31 , the movable teeth 11 are mounted on the high surface 30 , and the fixed teeth 10 are mounted on the low surface 31 .

[0033] In this embodiment, the movable tooth piece 11 is a deformable spring. The movable tooth piece 11 and the fixed tooth piece 10 are respectively installed on the high surface 30 and the low surface 31, so that the movable tooth piece 11 and the fixed tooth piece 10 can fit together better.

[0034] In one embodiment, Figure 4 shown.

[0035] The paper gripper bar structure provided in this embodiment has a fixed tooth piece 10 with a tooth opening hole 32 . When the movable tooth piece 11 is tightly attached to the fixed tooth piece 10 , the tooth opening hole 32 allows the tooth opening post 12 to pass through.

[0036] In this embodiment, the movable teeth 11 are provided with tooth posts 12, and the fixed teeth 10 are provided with tooth opening holes 32. Under normal conditions, the movable teeth 11 and the fixed teeth 10 are closed. When paper is to be gripped, the ejector pins of the printing press simultaneously lift all the tooth posts 12 to open the teeth. The paper is then fed between the movable teeth 11 and the fixed teeth 10. Of course, the above operation retains the existing method.

[0037] In one embodiment, Figure 4 shown.

[0038] In the paper gripper bar structure provided in this embodiment, a reinforcing spring 33 is provided on the movable jaw 11 , and the reinforcing spring 33 and the movable jaw 11 are mounted on the high surface 30 via a pressing plate 34 .

[0039] In this embodiment, the gripping force can be enhanced by adding a reinforcing spring 33 to the movable teeth 11. In addition, since the gripper bar structure of this embodiment opens more frequently than conventional gripper bar structures, the provision of the reinforcing spring 33 can, to a certain extent, prevent the service life of the gripper bar structure from being shortened.

[0040] In one embodiment, Figure 5 shown.

[0041] In the paper gripper bar structure provided in this embodiment, a sinking groove 35 is formed between the opening connecting plate 13 and the contact plate 14 . The sinking groove 35 provides a space for the linear drive device 17 to make way when the circumferential drive device 16 drives the linear drive device 17 circumferentially.

[0042] In this embodiment, by providing a sinking groove 35 between the open-thread connecting plate 13 and the contact plate 14 , the connection between the open-thread connecting plate 13 and the contact plate 14 can bypass the movable path of the linear drive device 17 .

[0043] In one embodiment, Figure 5 shown.

[0044] The paper gripper bar structure provided in this embodiment has an electrical box 36 on its clamping bar seat 19, and the electrical box 36 integrates a power supply and a control module. Each tensile strain gauge 23 is led to the electrical box 36 through a bus 37 and connected to the control module. The circumferential drive device 16, the linear drive device 17 and the tensile strain gauge 23 are all powered by the power supply in the electrical box 36.

[0045] In this embodiment, an electrical box 36 is provided, in which a power supply and a control module are integrated. The control module has communication capabilities and can send the data of the tensile strain gauge 23 to the control center, while the power supply of the circular drive device 16, the linear drive device 17 and the tensile strain gauge 23 are all solved by the power supply.

[0046] In one embodiment, Figure 6 shown.

[0047] The paper gripper bar structure provided in this embodiment has a contact rail 28 including a straight rail plate 38 and an inclined rail plate 39 connected to each other, wherein the inclined rail plate 39 is located at the rear end of the straight rail plate 38, and the inclined rail plate 39 is inclined upward relative to the straight rail plate 38; when the paper gripper bar 8 returns from the rear arc guide rail 3 to the front arc guide rail 1, the contact plate 14 contacts the inclined rail plate 39 to open the paper gripper bar 8, and in the process of the contact plate 14 moving forward against the straight rail plate 38, the paper gripper bar 8 remains in the open state.

[0048] In this embodiment, the gripper row 8 can be opened by the inclined rail plate 39 , and the gripper row 8 can be kept in the opened state by the straight rail plate 38 .

[0049] In one embodiment, Figure 6 shown.

[0050] The gripper bar structure provided in this embodiment includes a contact rail 28 that further includes a side plate 40 connected to the outside of the straight rail plate 38. The side plate 40 is further connected to the outside of the upper straight guide rail 4. The inner ends of the contact block 29 are provided with contact surfaces 41 that are inclined relative to the longitudinal direction of the upper straight guide rail 4.

[0051] In one embodiment, Figure 3 shown.

[0052] In the gripper bar structure provided in this embodiment, chain rollers 42 are provided at both ends of the gripper bar body 9 , and the gripper bar 8 is connected to the roller chain 5 via the chain rollers 42 .

[0053] The specific embodiments described above further illustrate the purpose of the present invention, technical solutions, and beneficial effects. It should be understood that the above description is merely a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. In particular, it should be noted that for those skilled in the art, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A paper gripper bar structure, comprising a front arc guide rail (1), a lower straight guide rail (2), a rear arc guide rail (3), an upper straight guide rail (4) and a roller chain (5) arranged in each guide rail, wherein the front arc guide rail (1) is provided with a driving sprocket (6), the rear arc guide rail (3) is provided with a driven sprocket (7), the driving sprocket (6) and the driven sprocket (7) are connected by the roller chain (5), and the roller chain (5) is further provided with a plurality of paper gripper bars (8); characterized in that: The paper gripping tooth row (8) comprises a tooth row body (9), wherein the tooth row body (9) is provided with a plurality of fixed tooth pieces (10) distributed at equal intervals, and the tooth row body (9) is further provided with a movable tooth piece (11) covering the fixed tooth piece (10), and the movable tooth piece (11) is provided with an opening tooth column (12) facing the fixed tooth piece (10), and each movable tooth piece (11) is connected to an opening tooth connecting plate (13) on the side facing away from the fixed tooth piece (10), and both ends of the opening tooth connecting plate (13) are provided with A contact plate (14) extending outward to a position close to the roller chain (5), support members (15) are provided at both ends of the tooth bar body (9), a circumferential drive device (16) is provided on the support member (15), the circumferential drive direction of the circumferential drive device (16) is perpendicular to the length direction of the tooth bar body (9), and a linear drive device (17) is provided at the output end of the circumferential drive device (16), the linear drive direction of the linear drive device (17) is perpendicular to the length direction of the tooth bar body (9); The output ends of the two linear drive devices (17) are provided with a clamping assembly (18), and the clamping assembly (18) includes a clamping bar seat (19) along the length direction of the tooth bar body (9), and the clamping bar seat (19) is provided with a plurality of clamping grooves (20) corresponding to the plurality of movable teeth (11). The length direction of the clamping groove (20) is parallel to the length direction of the clamping bar seat (19), and a clamping block (21) capable of sliding along the length direction thereof is provided in the clamping groove (20), and one end of the clamping block (21) is connected to one end of the clamping groove (20) through a clamping spring (22). The other end of the clamping block (21) is connected to a tensile strain gauge (23), and the clamping assembly (18) further comprises an L-shaped connecting plate (24) connected to the end of the clamping bar seat (19) on one side, and a transverse movement hole (25) along the length direction of the clamping bar seat (19) is opened on the other side of the connecting plate (24), and a connecting block (26) capable of sliding along the length direction thereof is provided in the transverse movement hole (25), and the connecting block (26) is connected to one end of the transverse movement hole (25) via a connecting spring (27), and the connecting block (26) is connected to the output end of the linear drive device (17); The upper straight guide rails (4) on both sides are provided with contact rails (28). When the gripper bar (8) passes through the contact rails (28), the contact plates (14) and the contact rails (28) contact each other and the gripper bar (8) is kept in an open-tooth state through the open-tooth connecting plate (13). The upper straight guide rail (4) on one side is also provided with a contact block (29). When the gripper bar (8) passes through the contact block (29), the connecting plate (24) on one side contacts the contact block (29) to cause the gripper bar assembly (18) to move laterally.

2. The gripper bar structure according to claim 1, characterized in that: The tooth row body (9) is provided with a stepped high surface (30) and a low surface (31); the movable tooth piece (11) is mounted on the high surface (30); and the fixed tooth piece (10) is mounted on the low surface (31).

3. The gripper bar structure according to claim 2, characterized in that: The fixed tooth piece (10) is provided with a tooth opening hole (32). When the movable tooth piece (11) is tightly attached to the fixed tooth piece (10), the tooth opening hole (32) allows the tooth opening column (12) to pass through.

4. The gripper bar structure according to claim 2, characterized in that: A reinforcing spring (33) is provided on the movable tooth piece (11), and the reinforcing spring (33) and the movable tooth piece (11) are mounted on the high surface (30) via a pressing plate (34).

5. The gripper bar structure according to claim 2, characterized in that: A sinking groove (35) is formed between the tooth-opening connecting plate (13) and the contact plate (14), and the sinking groove (35) provides a space for the linear drive device (17) to make way when the linear drive device (17) is driven circumferentially by the circumferential drive device (16).

6. The gripper bar structure according to claim 1, characterized in that: An electrical box (36) is provided on the clamping bar seat (19), and a power supply and a control module are integrated in the electrical box (36). Each of the tensile strain gauges (23) is led into the electrical box (36) through a bus (37) and connected to the control module. The circumferential drive device (16), the linear drive device (17) and the tensile strain gauge (23) are all powered by the power supply in the electrical box (36).

7. The gripper bar structure according to claim 1, characterized in that: The contact rail (28) comprises a straight rail plate (38) and an inclined rail plate (39) connected to each other, wherein the inclined rail plate (39) is located at the rear end of the straight rail plate (38) and is inclined upward relative to the straight rail plate (38); when the paper gripper bar (8) returns from the rear circular arc guide rail (3) to the front circular arc guide rail (1), the contact plate (14) contacts the inclined rail plate (39) to open the paper gripper bar (8), and in the process of the contact plate (14) moving forward against the straight rail plate (38), the paper gripper bar (8) maintains the open state.

8. The gripper bar structure according to claim 7, characterized in that: The contact rail (28) further comprises a side plate (40) connected to the outside of the straight rail plate (38), and the side plate (40) is also connected to the outside of the upper straight guide rail (4).

9. The gripper bar structure according to claim 1, characterized in that: Contact surfaces (41) inclined relative to the length direction of the upper straight guide rail (4) are provided at both ends of the inner side of the contact block (29).

10. The gripper bar structure according to claim 1, characterized in that: Both ends of the gripper bar body (9) are provided with chain rollers (42), and the paper gripper bar (8) is connected to the roller chain (5) via the chain rollers (42).

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