Multi-specification robotic unboxing system

Abstract

Multi-specification robot opening box system has flat paper box board position, cover folding and sealing assembly and industrial robot. In the utility model, at least two stations are arranged to store the folded paper box board, the suction cup unit is arranged on the first swing arm and the second swing arm, the suction cup unit is adsorbed on the surface of the corresponding paper box board to realize the corresponding paper box board is grabbed, the rear end of the second swing arm is pulled by the first cylinder to realize that the swing angle range between the second swing arm and the first swing arm is 0~90 DEG, the second swing arm is swung relative to the first swing arm to realize the action of unfolding the paper box board, the flat paper box board position is independently configured to form physical isolation, the synchronous prestorage and parallel supply capacity of different size paper box boards are realized, thereby effectively eliminating the production interruption caused by the paperboard box specification switching process of traditional equipment, and the industrial robot is used as the execution center to reliably adsorb and grab the cross-specification paper box board and stably transfer in space.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery, and in particular to a multi-specification robot unpacking system. Background Technology

[0002] The current manual or semi-automatic mode has problems such as low efficiency, high dependence on human labor, difficulty in ensuring consistent operation quality, and potential work injury risks. While the existing fully automatic carton opening equipment can improve basic efficiency, it is limited by rigid adaptability and can usually only process a single size of carton. Once the carton type is changed, it is necessary to manually adjust the mechanism parameters or even replace parts, resulting in long downtime for production line changeover and serious lack of flexibility.

[0003] Existing carton erecting machine technology has several drawbacks: frequent downtime due to the need to change carton sizes and the use of single-compartment or linear production lines, limiting the storage to only one carton size. Changing carton types requires manual intervention, causing production line interruptions. This severely restricts flexible production cycles, resulting in significant capacity losses in multi-variety, small-batch production scenarios. Utility Model Content

[0004] This utility model provides a multi-specification robot unpacking system, the main purpose of which is to overcome the shortcomings of existing robot unpacking systems that can usually only handle single-specification cartons.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This disclosure provides a multi-specification robot unpacking system, including: Flat carton board storage compartment (1) is provided with at least two workstations, which are used to store folded carton boards (2). Fold-over sealing assembly (3), which is used to fold over the carton board (2); and An industrial robot (4) is set on one side close to the folding and sealing assembly (3). The robot arm (5) of the industrial robot (4) switches positions between the flat carton board compartment (1) and the folding and sealing assembly (3). The robot arm (5) adsorbs the corresponding carton board (2) in the corresponding flat carton board compartment (1), thereby driving the carton board (2) to move in three dimensions. The robot arm (5) is provided with a first swing arm (6), a second swing arm (7), a pivot shaft (10), and a suction cup unit (11) for adsorbing the corresponding carton board (2). The front part of the first swing arm (6) and the rear part of the second swing arm (7) are connected by the pivot shaft (10). The first swing arm (6) is integrated with a first cylinder (8). The front part of the telescopic rod 9 of the first cylinder (8) extends to the front part of the first swing arm (6) and is connected to the rear part of the second swing arm (7). The rear end of the second swing arm (7) is pulled by the first cylinder (8) and swings around the pivot shaft (10) to achieve a swing angle range of 0 to 90° between the second swing arm (7) and the first swing arm (6). The action of unfolding the carton board (2) is achieved by driving the second swing arm (7) to swing relative to the first swing arm (6). Both the first swing arm (6) and the second swing arm (7) are equipped with suction cup units (11). By adsorbing the suction cup units (11) onto the surface of the corresponding carton board (2), the corresponding carton board (2) can be grasped.

[0006] Preferably, a flange (12) is provided on the outer side of the first swing arm (6), and the flange (12) is connected to the robot arm (5).

[0007] Preferably, the workstation includes at least one first workstation (13) and at least one second workstation (14), and the cardboard board (2) includes a first cardboard board (2) and a second cardboard board (2). The first workstation (13) contains a folded first cardboard board (2), and the second workstation (14) contains a folded second cardboard board (2). The length of the first cardboard board (2) is greater than the length of the second cardboard board (2), and the width of the first cardboard board (2) is greater than the width of the second cardboard board (2).

[0008] Preferably, the first workstation (13) and the second workstation (14) are arranged around the industrial robot (4).

[0009] Preferably, the folding and sealing assembly (3) has a long strip of assembly line support (15), and an inlet guide plate (16) is provided on the rear part of the assembly line support (15). The tail of the inlet guide plate (16) has an arc-shaped protrusion (17), and a long strip (18) is provided on the front part of the protrusion (17). A push plate (19) is provided on each of the left and right sides of the front part of the inlet guide plate (16), and a box pressing guide rod (20) is provided on the front side of the long strip (18). A rotatable sealing mechanism (21) is provided on the rear part of the assembly line support (15).

[0010] Preferably, the protrusion (17) is used to guide and complete the folding of the carton board (2) in the width direction. The push plate (19) is driven by the second cylinder (34) to move towards the long strip (18), thereby pushing the carton board (2) to fold in the length direction by the push plate (19). The first motor (35) drives the pressure guide rod (20) to swing between the X-axis and Y-axis directions, thereby pushing the folding of the carton board (2) on the front by the pressure guide rod (20).

[0011] Preferably, a box-out channel (22) is provided at the rear of the assembly line support (15). A transmission mechanism (23) is provided on the left and right sides of the box-out channel (22). The transmission mechanism (23) has a conveyor belt (24) extending along the length of the box-out channel (22). The second motor 25 drives the pulley, thereby driving the conveyor belt (24) to rotate. A box-sealing core (21) is provided at the bottom of the box-out channel (22). Adhesive tape is wound on the upper surface of the box-sealing core (21). Unpowered rollers 26 are arranged on the left and right sides of the box-sealing core (21). The rotation of the conveyor belt (24) pushes the carton board (2) to move along the length of the box-out channel (22) so that the adhesive tape is pasted on the lower surface of the carton board (2).

[0012] Preferably, the suction cup unit (11) includes a suction cup body (27), a vacuum generator (28) disposed on the head of the suction cup body (27), an air pipe and an air pump. The air pump is connected to the vacuum generator (28) through the air pipe. The vacuum generator (28) is used to extract air from the suction cup body (27) so that the suction cup body (27) is adsorbed on the surface of the cardboard board (2).

[0013] Preferably, the workstation is equipped with at least one storage rack (29), the storage rack (29) has an inclined tabletop (30), an adjusting rod (36) is horizontally arranged in the tabletop (30), a handwheel (33) is provided at the tail of the adjusting rod (36), and a clamping plate (32) is connected to the adjusting rod (36) through a sliding nut (31). By rotating the handwheel (33) to move the sliding nut (31) in the length extension direction of the adjusting rod (36), the position of the clamping plate (32) is adjusted. The clamping plate (32) is used to clamp the cardboard board (2) on the tabletop (30).

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model has a simple structure and strong practicality. By setting up at least two workstations to store folded cardboard boxes, each of the first and second swing arms is equipped with a suction cup unit. By adsorbing the suction cup unit onto the surface of the corresponding cardboard box, the corresponding cardboard box can be grasped. The rear end of the second swing arm is pulled by the first cylinder, so that the swing angle between the second swing arm and the first swing arm is within the range of 0 to 90°. By driving the second swing arm to swing relative to the first swing arm, the cardboard box is unfolded. The independently configured flat cardboard box compartments form physical isolation, realizing the synchronous pre-storage and parallel supply capability of cardboard boxes of different sizes. This effectively eliminates the production interruption caused by the cardboard box specification switching process in traditional equipment. The industrial robot, as the execution center, completes the reliable adsorption and grasping, stable spatial transfer, and dynamic unfolding and shaping of cardboard boxes of different specifications. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an industrial robot.

[0016] Figure 2 This is a schematic diagram of the suction cup unit.

[0017] Figure 3 This is a schematic diagram of the folding and sealing box assembly.

[0018] Figure 4 This is a schematic diagram of the assembly line support structure.

[0019] Figure 5 This is a schematic diagram of the storage shelf structure.

[0020] Explanation of reference numerals in the attached figures 1. Flat carton tray compartment; 2. Carton tray; 3. Folding and sealing assembly; 4. Industrial robot; 5. Robotic arm; 6. First swing arm; 7. Second swing arm; 8. First cylinder; 9. Telescopic rod; 10. Pivot shaft; 11. Suction cup unit; 12. Flange; 13. First workstation; 14. Second workstation; 15. Assembly line support; 16. Inlet guide plate; 17. Protrusion; 18. Long strip; 19. Push plate; 20. Pressing guide rod; 21. Sealing mechanism; 22. Outlet channel; 23. Transmission mechanism; 24. Conveyor belt; 25. Second motor; 26. Non-powered roller; 27. Suction cup body; 28. Vacuum generator; 29. ​​Storage rack; 30. Tabletop; 31. Sliding nut; 32. Clamping plate; 33. Handwheel; 34. Second cylinder; 35. First motor; 36. Adjusting rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments clearer, the technical solutions of the embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be present in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar words used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Words such as "comprising" or "having" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0024] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The multi-specification industrial robot unpacking system includes: a flat carton compartment 1, a carton 2; a folding and sealing assembly 3, an industrial robot 4, a robotic arm 5, a first swing arm 6, a second swing arm 7, a first cylinder 8, a telescopic rod 9, a pivot shaft 10, a suction cup unit 11, a flange 12, a first workstation 13, a second workstation 14, a production line support 15, an inlet guide plate 16, a protrusion 17, a long strip 18, a push plate 19, a pressing guide rod 20, a sealing mechanism 21, an outlet channel 22, a transmission mechanism 23, a conveyor belt 24, a second motor 25, a non-powered roller 26, a suction cup body 27, a vacuum generator 28, an air pipe, an air pump, a storage rack 29, a table 30, a sliding nut 31, a clamping plate 32, a handwheel 33, a second cylinder 34, a first motor 35, and an adjusting rod 36.

[0025] Reference Figure 1 The flat carton compartment 1 is equipped with at least two workstations, which are used to store folded carton boards 2, and the folding and sealing assembly 3 is used to fold and seal the carton boards 2.

[0026] Reference Figure 1 The industrial robot 4 is positioned on one side near the folding and sealing assembly 3. The robotic arm 5 of the industrial robot 4 switches positions between the flat carton compartment 1 and the folding and sealing assembly 3.

[0027] Reference Figure 1 and Figure 2The robot arm 5 adsorbs the corresponding cardboard board 2 in the corresponding flat cardboard board compartment 1, thereby driving the cardboard board 2 to move in three dimensions. The robot arm 5 is equipped with a first swing arm 6, a second swing arm 7, a pivot shaft 10, and a suction cup unit 11 for adsorbing the corresponding cardboard board 2. The front part of the first swing arm 6 and the rear part of the second swing arm 7 are connected by the pivot shaft 10. The first swing arm 6 integrates a first cylinder 8. The front part of the telescopic rod 9 of the first cylinder 8 extends to the front part of the first swing arm 6 and is connected to the rear part of the second swing arm 7.

[0028] Reference Figure 2 The first cylinder 8 pulls the rear end of the second swing arm 7 to achieve a swing angle range of 0 to 90° between the second swing arm 7 and the first swing arm 6. By driving the second swing arm 7 to swing relative to the first swing arm 6, the action of unfolding the carton board 2 is realized. Both the first swing arm 6 and the second swing arm 7 are provided with suction cup units 11. By adsorbing the suction cup units 11 onto the surface of the corresponding carton board 2, the corresponding carton board 2 can be grasped. A flange 12 is provided on the outer side of the first swing arm 6, and it is connected to the robot arm 5 through the flange 12.

[0029] Reference Figure 1 The workstation includes at least one first workstation 13 and at least one second workstation 14. The cardboard board 2 includes a first cardboard board and a second cardboard board. The first workstation 13 contains a folded first cardboard board, and the second workstation 14 contains a folded second cardboard board. The length of the first cardboard board is greater than the length of the second cardboard board, and the width of the first cardboard board is greater than the width of the second cardboard board.

[0030] Reference Figure 1 The first workstation 13 and the second workstation 14 are arranged around the industrial robot 4.

[0031] Reference Figure 1 , Figure 3 and Figure 4 The folding and sealing assembly 3 has a long assembly line support 15. An inlet guide plate 16 is provided on the rear of the assembly line support 15. The tail of the inlet guide plate 16 has an arc-shaped protrusion 17. A long strip 18 extends from the front of the protrusion 17. A push plate 19 is provided on the left and right sides of the front of the inlet guide plate 16. A box pressing guide rod 20 is provided on the front side of the long strip 18. A rotatable sealing mechanism 21 is provided on the rear of the assembly line support 15.

[0032] Reference Figure 3 , Figure 4 and Figure 3The protrusion 17 is used to guide and complete the folding of the carton board 2 in the width direction. The push plate 19 is driven by the second cylinder 34 to move towards the long strip 18, thereby pushing the folding of the carton board 2 in the length direction. The first motor 35 drives the pressure guide rod 20 to swing between the X and Y axes, thereby pushing the folding of the carton board 2 at the front.

[0033] Reference Figure 3 , Figure 4 and Figure 3 A box-out channel 22 is provided at the rear of the assembly line support 15. A transmission mechanism 23 is provided on the left and right sides of the box-out channel 22. The transmission mechanism 23 has a conveyor belt 24 extending along the length of the box-out channel 22. The second motor 25 drives the pulley, thereby driving the conveyor belt 24 to rotate. A box-sealing core 21 is provided at the bottom of the box-out channel 22. Adhesive tape is wound on the upper surface of the box-sealing core 21. Unpowered rollers 26 are arranged on the left and right sides of the box-sealing core 21. The rotation of the conveyor belt 24 pushes the carton board 2 to move along the length of the box-out channel 22 so that the adhesive tape is pasted on the lower surface of the carton board 2.

[0034] Reference Figure 2 The suction cup unit 11 includes a suction cup body 27, a vacuum generator 28 disposed on the head of the suction cup body 27, an air pipe and an air pump. The air pump is connected to the vacuum generator 28 through the air pipe. The vacuum generator 28 is used to extract air from the suction cup body 27 so that the suction cup body 27 is adsorbed on the surface of the cardboard board 2.

[0035] Reference Figure 5 The workstation is equipped with at least one storage rack 29, which has an inclined tabletop 30. An adjusting rod 36 is horizontally arranged in the tabletop 30. A handwheel 33 is provided at the end of the adjusting rod 36. A clamping plate 32 is connected to the adjusting rod 36 through a sliding nut 31. By rotating the handwheel 33, the sliding nut 31 is moved in the length extension direction of the adjusting rod 36 to adjust the position of the clamping plate 32. The clamping plate 32 is used to clamp the cardboard board 2 on the tabletop 30.

[0036] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5Working process: The industrial robot 4 drives the robotic arm 5 to move to the target compartment based on the instructions output by the control cabinet, and picks up the cardboard board 2 by suction. The first cylinder 8 pulls the rear end of the second swing arm 7 so that the swing angle between the second swing arm 7 and the first swing arm 6 is within the range of 0 to 90°. By driving the second swing arm 7 to swing relative to the first swing arm 6, the action of unfolding the cardboard board 2 is realized. The vacuum generator 28 extracts the air in the suction cup body 27 so that the suction cup body 27 is attached to the surface of the cardboard board 2, so that the suction cup unit 11 is attached to the corresponding cardboard board 2 surface, thereby realizing the grasping of the corresponding cardboard board 2.

[0037] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Industrial robot 4 carries the formed cardboard board 2 to the folding and sealing assembly 3. Guided by the protrusion 17, it folds the cardboard board 2 in the width direction. The second cylinder 34 drives the push plate 19 to move towards the elongated section 18, thus pushing the cardboard board 2 to fold in the length direction. The first motor 35 drives the pressure guide rod 20 to swing between the X and Y axes, pushing the cardboard board 2 to fold at the front. The second motor 25 drives the pulley, thereby driving the conveyor belt. The belt 24 rotates, and a sealing core 21 is set at the bottom of the box exit channel 22. Adhesive tape is wound on the upper surface of the sealing core 21, and unpowered rollers 26 are arranged on the left and right sides of the sealing core 21. The rotation of the conveyor belt 24 pushes the carton board 2 to move along the length direction of the box exit channel 22 so that the adhesive tape is pasted on the lower surface of the carton board 2. Thus, the robot arm 5 cooperates with the folding and sealing assembly 3 to complete the folding, pressing and tape sealing process of the carton board 2. After the process is completed, the formed carton board 2 is transported out by the conveyor belt.

[0038] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 By adopting an innovative architecture with a central industrial robot 4 and a multi-compartment surround layout, a physically isolated surround feeding system is formed by four independently configured flat carton board compartments 1. This enables the simultaneous pre-storage and parallel supply of four different sizes of carton boards 2, thereby eliminating production interruptions caused by specification switching in traditional equipment and giving the system a high degree of continuous feeding characteristics with zero switching. As the execution hub, the industrial robot 4 is equipped with a dedicated unpacking component that integrates vacuum adsorption control and intelligent trajectory planning technology, accurately and reliably adsorbing and grasping cross-size carton boards 2, stably transferring them spatially, and dynamically unfolding and shaping them.

[0039] Reference Figure 1 ,Figure 2 , Figure 3 , Figure 4 and Figure 5 The unfolded cardboard board 2 is directly transferred by the industrial robot 4 to the adjacent sealing station. Relying on the coordinated control of spatial path and timing, the unpacking and sealing processes are seamlessly connected, thus building a fully automated closed loop of "multi-specification parallel supply - adaptive unpacking - direct sealing".

[0040] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 In a preferred embodiment, by integrating a surround-type multi-compartment layout with an industrial robot 4 in physical space, two first workstations are set up to store two different sizes of cardboard boxes 2, and two second workstations are set up to store two different sizes of cardboard boxes 2, thereby realizing the parallel pre-storage and on-demand retrieval of four sizes of cardboard boxes 2. Combined with the trajectory planning capability of the industrial robot 4, the cardboard boxes 2 of different workstations can be automatically identified, grasped and accurately opened without human intervention, thus achieving continuous and adaptive processing of multiple sizes of cardboard boxes 2.

[0041] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A multi-specification robot unpacking system, characterized in that, include: Flat carton board storage compartment (1) is provided with at least two workstations, which are used to store folded carton boards (2). Fold-over sealing assembly (3), which is used to fold over the carton board (2); and An industrial robot (4) is set on one side close to the folding and sealing assembly (3). The robot arm (5) of the industrial robot (4) switches positions between the flat carton board compartment (1) and the folding and sealing assembly (3). The robot arm (5) adsorbs the corresponding carton board (2) in the corresponding flat carton board compartment (1), thereby driving the carton board (2) to move in three dimensions. The robot arm (5) is provided with a first swing arm (6), a second swing arm (7), a pivot shaft (10), and a suction cup unit (11) for adsorbing the corresponding carton board (2). The front part of the first swing arm (6) and the rear part of the second swing arm (7) are connected by the pivot shaft (10). The first swing arm (6) is integrated with a first cylinder (8). The front part of the telescopic rod (9) of the first cylinder (8) extends to the front part of the first swing arm (6) and is connected to the rear part of the second swing arm (7). The rear end of the second swing arm (7) is pulled by the first cylinder (8) and swings around the pivot shaft (10) to achieve a swing angle range of 0 to 90° between the second swing arm (7) and the first swing arm (6). The action of unfolding the carton board (2) is achieved by driving the second swing arm (7) to swing relative to the first swing arm (6). Both the first swing arm (6) and the second swing arm (7) are equipped with suction cup units (11). By adsorbing the suction cup units (11) onto the surface of the corresponding carton board (2), the corresponding carton board (2) can be grasped.

2. The multi-specification robot unpacking system as described in claim 1, characterized in that, A flange (12) is provided on the outer side of the first swing arm (6), and is connected to the robot arm (5) through the flange (12).

3. The multi-specification robot unpacking system as described in claim 1, characterized in that, The workstation includes at least one first workstation (13) and at least one second workstation (14). The cardboard board (2) includes a first cardboard board (2) and a second cardboard board (2). The first workstation (13) contains a folded first cardboard board (2), and the second workstation (14) contains a folded second cardboard board (2). The length of the first cardboard board (2) is greater than the length of the second cardboard board (2), and the width of the first cardboard board (2) is greater than the width of the second cardboard board (2).

4. The multi-specification robot unpacking system as described in claim 1, characterized in that, The first workstation (13) and the second workstation (14) are arranged around the industrial robot (4).

5. The multi-specification robot unpacking system as described in claim 1, characterized in that, The folding and sealing assembly (3) has a long strip of assembly line support (15). An inlet guide plate (16) is provided on the rear of the assembly line support (15). The tail of the inlet guide plate (16) has an arc-shaped protrusion (17). A long strip (18) extends from the front of the protrusion (17). A push plate (19) is provided on the left and right sides of the front of the inlet guide plate (16). A box pressing guide rod (20) is provided on the front side of the long strip (18). A rotatable sealing mechanism (21) is provided on the rear of the assembly line support (15).

6. The multi-specification robot unpacking system as described in claim 1, characterized in that, The protrusion (17) is used to guide and complete the folding of the carton board (2) in the width direction. The push plate (19) is driven by the second cylinder (34) to move towards the long strip (18), thereby pushing the carton board (2) to fold in the length direction by the push plate (19). The first motor (35) drives the pressure guide rod (20) to swing between the X and Y axes, thereby pushing the carton board (2) to fold in the front part by the pressure guide rod (20).

7. The multi-specification robot unpacking system as described in claim 1, characterized in that, A box-out channel (22) is provided at the rear of the assembly line support (15). A transmission mechanism (23) is provided on the left and right sides of the box-out channel (22). The transmission mechanism (23) has a conveyor belt (24) extending along the length of the box-out channel (22). The belt pulley is driven by the second motor (25) to drive the conveyor belt (24) to rotate. A box-sealing core (21) is provided at the bottom of the box-out channel (22). Adhesive tape is wound on the upper surface of the box-sealing core (21). Unpowered rollers (26) are arranged on the left and right sides of the box-sealing core (21). The rotation of the conveyor belt (24) pushes the carton board (2) to move along the length of the box-out channel (22) so that the adhesive tape is pasted on the lower surface of the carton board (2).

8. The multi-specification robot unpacking system as described in claim 1, characterized in that, The suction cup unit (11) includes a suction cup body (27), a vacuum generator (28) located on the head of the suction cup body (27), an air pipe and an air pump. The air pump is connected to the vacuum generator (28) through the air pipe. The vacuum generator (28) is used to extract air from the suction cup body (27) so that the suction cup body (27) is adsorbed onto the surface of the cardboard board (2).

9. The multi-specification robot unpacking system as described in claim 1, characterized in that, The workstation is equipped with at least one storage rack (29), which has an inclined tabletop (30). An adjusting rod (36) is horizontally arranged in the tabletop (30). A handwheel (33) is provided at the end of the adjusting rod (36). A clamp (32) is connected to the adjusting rod (36) via a sliding nut (31). By rotating the handwheel (33), the sliding nut (31) is displaced in the length extension direction of the adjusting rod (36) to adjust the position of the clamp (32). The clamp (32) is used to clamp the cardboard (2) on the tabletop (30).

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