A suturing mechanism for a suturing machine

Abstract

This utility model relates to the field of sewing machine technology, specifically a sewing mechanism for a sewing machine, including a base, an upper cutter holder, and a lower cutter holder. The upper cutter holder is fixedly mounted on the base, and the lower cutter holder is movably mounted on the base and can move up and down relative to the upper cutter holder. A first reset plate is movably mounted on the upper cutter holder, and an upper cutter and a first hydraulic cylinder are fixedly mounted on the upper cutter holder. The end of the upper cutter passes through or out of the first reset plate, and the telescopic rod of the first hydraulic cylinder passes through the upper cutter holder and is fixedly connected to the first reset plate. A second reset plate is movably mounted on the lower cutter holder, and a lower cutter and a second hydraulic cylinder are fixedly mounted on the lower cutter holder. The end of the lower cutter passes through or out of the second reset plate, and the telescopic rod of the second hydraulic cylinder passes through the lower cutter holder and is fixedly connected to the second reset plate. In this sewing mechanism for a sewing machine, the upper and lower cutters interact to sew the material tail and the material head together, completing the threading process, and allowing for rapid separation of the thick aluminum plate from the upper and lower cutters.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and specifically to a sewing mechanism for a sewing machine. Background Technology

[0002] To facilitate threading, the sewing machine uses a hydraulic pressurization method to stitch the tail of the thick aluminum plate from the previous process to the head of the thick aluminum plate from the next process together, thereby reducing manual threading and improving production efficiency. Originally, after sewing, the springs on the upper and lower cutter holders would release the cutter from the thick aluminum plate. However, during the sewing of thick aluminum plates (1.0mm-4.3mm), due to the thickness and hardness of the plate, the force of the return springs after sewing is insufficient to automatically detach the cutter. Attempts to detach the cutter by changing the cutter's angle and increasing the spring diameter have been made, but the effect is not significant, and proper repositioning is still not achieved. Currently, manual prying of the upper and lower cutter holders is required to detach the cutter, increasing labor intensity and reducing production efficiency. Therefore, a sewing mechanism for the sewing machine is urgently needed to solve the above problems. Utility Model Content

[0003] To address the technical problem that during the stitching process of thick aluminum plates, the force of the return spring is insufficient to detach the tool from the plate after stitching due to the plate's thickness and hardness, this invention provides a stitching mechanism for a stitching machine. The upper and lower tools interact to stitch the material tail and head together, completing the threading process. A first return plate, driven by a first hydraulic cylinder, applies a downward force to the thick aluminum plate, thus separating the upper tool from the plate. A second return plate, driven by a second hydraulic cylinder, applies an upward force to the thick aluminum plate, thus separating the lower tool from the plate. This achieves rapid separation of the thick aluminum plate from the upper and lower tools.

[0004] This utility model provides a sewing mechanism for a sewing machine, including a machine base, an upper cutter holder, and a lower cutter holder. The upper cutter holder is fixedly mounted on the machine base, and the lower cutter holder is movably mounted on the machine base and can move up and down relative to the upper cutter holder. A first reset plate is movably mounted on the upper cutter holder, and an upper cutter and a first hydraulic cylinder are fixedly mounted on the upper cutter holder. The end of the upper cutter passes through or out of the first reset plate, and the telescopic rod of the first hydraulic cylinder passes through the upper cutter holder and is fixedly connected to the first reset plate. A second reset plate is movably mounted on the lower cutter holder, and a lower cutter and a second hydraulic cylinder are fixedly mounted on the lower cutter holder. The end of the lower cutter passes through or out of the second reset plate, and the telescopic rod of the second hydraulic cylinder passes through the lower cutter holder and is fixedly connected to the second reset plate. One upper cutter is inserted into the material head, and one lower cutter is inserted into the material tail. Finally, the combined action of multiple upper and lower cutters sews the material head and tail together in a wavy pattern, completing the threading process.

[0005] Furthermore, multiple upper and lower cutting tools are provided. The multiple upper cutting tools are arranged in a row along the width direction of the upper tool holder, and the multiple lower cutting tools are arranged in a row along the width direction of the lower tool holder. The multiple upper and lower cutting tools are arranged in an alternating manner.

[0006] Furthermore, the first reset plate is provided with multiple first through holes, and each end of the upper cutter is provided with a first protrusion, which is an inverted triangle, and the first protrusion passes through or exits the first through hole; the second reset plate is provided with multiple second through holes, and each end of the lower cutter is provided with a second protrusion, which is triangular, and the second protrusion passes through or exits the second through hole. When the upper and lower cutters are threading the aluminum plate, the first protrusions exit the first through holes, and the second protrusions exit the second through holes; conversely, when the aluminum plate does not need to be threaded, the first protrusions enter the first through holes, and the second protrusions enter the second through holes.

[0007] Furthermore, a plurality of first reset springs are fixedly connected between the upper tool holder and the first reset plate, and a first connecting sleeve is fixedly provided on the first reset plate. The telescopic rod of the first hydraulic cylinder passes through the upper tool holder and is fixedly connected to the first connecting sleeve. A plurality of second reset springs are fixedly connected between the lower tool holder and the second reset plate, and a second connecting sleeve is fixedly provided on the second reset plate. The telescopic rod of the second hydraulic cylinder passes through the lower tool holder and is fixedly connected to the second connecting sleeve.

[0008] Furthermore, multiple first grooves are provided at corresponding positions on the upper tool holder and the first reset plate, and the first reset spring is fixedly connected to the first grooves on the upper tool holder and the first reset plate; multiple second grooves are provided at corresponding positions on the lower tool holder and the second reset plate, and the second reset spring is fixedly connected to the second grooves on the lower tool holder and the second reset plate. The first grooves define the position of the first reset spring, and the second grooves define the position of the second reset spring.

[0009] Furthermore, two displacement hydraulic cylinders are fixedly installed on the machine base below the upper tool holder. The telescopic rods of the two displacement hydraulic cylinders are fixedly connected to the support frame and drive the support frame to move up and down. The lower tool holder is fixedly installed on the support frame. When the displacement hydraulic cylinders are activated, they drive the support frame and the lower tool holder to move up and down, thereby driving the lower tool to move up and down.

[0010] Furthermore, a guide post is fixedly provided on the upper tool holder, and a guide groove is provided on the lower tool holder at a position corresponding to the guide post. The guide post passes through the guide groove and moves up and down within the guide groove. When the lower tool holder moves up and down relative to the upper tool holder, the lower tool holder moves up and down relative to the guide post. The guide post guides the lower tool holder, preventing the position of the lower tool holder from shifting during its up and down movement and affecting the threading process.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The sewing machine of this utility model uses a sewing mechanism in which the upper and lower cutters work together to sew the material tail and the material head together, completing the threading process; the first reset plate, driven by the first hydraulic cylinder, applies a downward force to the thick aluminum plate, thereby separating the upper cutter from the thick plate; the second reset plate, driven by the second hydraulic cylinder, applies an upward force to the thick aluminum plate, thereby separating the lower cutter from the thick plate; thus, the thick aluminum plate is quickly separated from the upper and lower cutters. Attached Figure Description

[0013] Figure 1 This is a cross-sectional structural schematic diagram of a sewing mechanism for a sewing machine according to the present invention;

[0014] Figure 2 This is a utility model Figure 1 Enlarged structural diagram of A in the middle;

[0015] Figure 3 This is a side sectional view of the sewing mechanism of this utility model;

[0016] Figure 4 This is a utility model Figure 3 Enlarged structural diagram of B in the middle;

[0017] Figure 5 This is a schematic diagram of the stitching mechanism of this utility model when threading the aluminum plate;

[0018] Figure 6 This utility model Figure 5 Enlarged schematic diagram of the structure of C;

[0019] The numbers in the attached diagram are:

[0020] 1. Machine base; 11. Displacement hydraulic cylinder; 12. Support frame; 2. Upper tool holder; 21. Guide column; 3. First reset plate; 31. First reset spring; 4. Upper tool; 5. First hydraulic cylinder; 6. Lower tool holder; 7. Second reset plate; 71. Second reset spring; 8. Lower tool; 9. Second hydraulic cylinder. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] like Figures 1-6As shown, a sewing mechanism for a sewing machine includes a base 1, an upper cutter holder 2, and a lower cutter holder 6. The upper cutter holder 2 is fixedly mounted on the base 1, and the lower cutter holder 6 is movably mounted on the base 1 and can move up and down relative to the upper cutter holder 2. A first reset plate 3 is movably mounted on the upper cutter holder 2, and an upper cutter 4 and a first hydraulic cylinder 5 are fixedly mounted on the upper cutter holder 2. The end of the upper cutter 4 passes through or out of the first reset plate 3, and the telescopic rod of the first hydraulic cylinder 5 passes through the upper cutter holder 2 and is fixedly connected to the first reset plate 3. A second reset plate 7 is movably mounted on the lower cutter holder 6, and a lower cutter 8 and a second hydraulic cylinder 9 are fixedly mounted on the lower cutter holder 6. The end of the lower cutter 8 passes through or out of the second reset plate 7, and the telescopic rod of the second hydraulic cylinder 9 passes through the lower cutter holder 6 and is fixedly connected to the second reset plate 7. An external conveying device conveys thick aluminum plates. The tail of the thick aluminum plate from the previous process is located below, and the head of the thick aluminum plate from the next process is located above, with the tail and head overlapping by 1mm to 2mm. The sewing mechanism can thread both thick and thin aluminum plates.

[0023] In this embodiment, during the threading process of the sewing mechanism on the thick aluminum plate, the lower cutter holder 6 moves upward relative to the upper cutter holder 2, causing the second reset plate 7 and the lower cutter 8 to move upward synchronously. When the material tail and the material head are clamped between the first reset plate 3 and the second reset plate 7, the first reset plate 3 moves upward relative to the upper cutter holder 2, and the end of the upper cutter 4 passes through the first reset plate 3 and abuts against the material head. The second reset plate 7 moves downward relative to the lower cutter holder 6, and the end of the lower cutter 8 passes through the second reset plate 7 and abuts against the material tail. The upper cutter 4 and the lower cutter 8 work together to sew the material tail and the material head together, completing the threading. It should be noted that when the first reset plate 3 and the second reset plate 7 move, they will drive the telescopic rods connected to them to move, but the hydraulic cylinders are not activated. After the threading is completed, the lower cutter holder 6 moves downward relative to the upper cutter holder 2. However, because the thick aluminum plate is thick and hard, the first reset plate 3 and the second reset plate 7 cannot move relative to the thick aluminum plate themselves, and the upper cutter 4 and the lower cutter 8 are stuck on the thick aluminum plate. Previously, the upper tool holder 2 and lower tool holder 6 were manually pried open (i.e., the first reset plate 3 and the second reset plate 7 were manually pried open), which was time-consuming, labor-intensive, and affected production efficiency. Now, in order to quickly separate the thick aluminum plate from the upper tool 4 and the lower tool 8, the first hydraulic cylinder 5 is activated, which moves the first reset plate 3 downward and presses it onto the thick aluminum plate. The first reset plate 3 applies a downward force to the thick aluminum plate, thereby separating the upper tool 4 from the thick plate (equivalent to pushing the thick plate off the upper tool 4). Similarly, the second hydraulic cylinder 9 is activated, which moves the second reset plate 7 upward and presses it onto the thick aluminum plate. The second reset plate 7 applies an upward force to the thick aluminum plate, thereby separating the lower tool 8 from the thick plate (equivalent to pushing the thick plate off the lower tool 8). After the thick aluminum plate is separated from the upper tool 4 and the lower tool 8, the lower tool holder 6 finally moves the second reset plate 7 and the lower tool 8 downward synchronously back to their original positions. The first hydraulic cylinder 5 drives the first reset plate 3 back to its initial position, and the end of the upper cutter 4 enters the first reset plate 3; the second hydraulic cylinder 9 drives the second reset plate 7 back to its initial position, and the end of the lower cutter 8 enters the second reset plate 7. This does not affect the feeding of the thick aluminum plate in the next process.

[0024] In this embodiment, during the threading process of the sewing mechanism on the thin aluminum sheet, the lower cutter holder 6 moves upward relative to the upper cutter holder 2, causing the second reset plate 7 and the lower cutter 8 to move upward synchronously. When the material tail and the material head are clamped between the first reset plate 3 and the second reset plate 7, the first reset plate 3 moves upward relative to the upper cutter holder 2, and the end of the upper cutter 4 passes through the first reset plate 3 and abuts against the material head. The second reset plate 7 moves downward relative to the lower cutter holder 6, and the end of the lower cutter 8 passes through the second reset plate 7 and abuts against the material tail. The upper cutter 4 and the lower cutter 8 work together to sew the material tail and the material head together, completing the threading. It should be noted that when the first reset plate 3 and the second reset plate 7 move, they will drive the telescopic rods connected to them to move, but the hydraulic cylinders are not activated. After the threading is completed, the lower cutter holder 6 moves downward relative to the upper cutter holder 2, causing the second reset plate 7 and the lower cutter 8 to move downward synchronously back to their original positions. Because the aluminum plate has a limited thickness, the first reset plate 3 and the second reset plate 7 can move relative to the aluminum plate. The first reset plate 3 returns to its initial position, causing the end of the upper cutter 4 to pass through the first reset plate 3; the second reset plate 7 returns to its initial position, causing the end of the lower cutter 8 to pass through the second reset plate 7. The upper cutter 4 and the lower cutter 8 will not get stuck on the aluminum plate.

[0025] In this embodiment, the sewing mechanism uses the upper cutter 4 and the lower cutter 8 to sew the material tail and the material head together, thus completing the threading process. The first reset plate 3, driven by the first hydraulic cylinder 5, applies a downward force to the thick aluminum plate, thereby separating the upper cutter 4 from the thick plate. The second reset plate 7, driven by the second hydraulic cylinder 9, applies an upward force to the thick aluminum plate, thereby separating the lower cutter 8 from the thick plate. The thick aluminum plate is then quickly separated from the upper cutter 4 and the lower cutter 8.

[0026] In one possible implementation, multiple upper cutters 4 and lower cutters 8 are provided. The multiple upper cutters 4 are arranged in a row along the width direction of the upper cutter holder 2, and the multiple lower cutters 8 are arranged in a row along the width direction of the lower cutter holder 6. The multiple upper cutters 4 and lower cutters 8 are staggered. When the material tail and material head are clamped between the first reset plate 3 and the second reset plate 7, the end of the upper cutter 4 protrudes from the first reset plate 3 and abuts against the material head, and the end of the lower cutter 8 protrudes from the second reset plate 7 and abuts against the material tail. The multiple upper cutters 4 and lower cutters 8 are staggered, and their interaction sews the material tail and material head together. Specifically, one upper cutter 4 is inserted into the material head, and one lower cutter 8 is inserted into the material tail. Finally, the multiple upper cutters 4 and lower cutters 8 work together to sew the material head and material tail together in a wavy pattern, completing the threading process.

[0027] In one possible implementation, the first reset plate 3 is provided with multiple first through holes, and each of the upper cutters 4 has a first protrusion at its end. The first protrusion is inverted triangular and passes through or exits the first through hole. The second reset plate 7 is provided with multiple second through holes, and each of the lower cutters 8 has a second protrusion at its end. The second protrusion is triangular and passes through or exits the second through hole. When the upper cutter 4 and the lower cutter 8 are threading the aluminum plate, the first protrusions exit the first through holes, and the second protrusions exit the second through holes; conversely, when the aluminum plate does not need to be threaded, the first protrusions enter the first through holes, and the second protrusions enter the second through holes.

[0028] In one possible implementation, a plurality of first return springs 31 are fixedly connected between the upper tool holder 2 and the first reset plate 3. A first connecting sleeve is fixedly installed on the first reset plate 3. The telescopic rod of the first hydraulic cylinder 5 passes through the upper tool holder 2 and is fixedly connected to the first connecting sleeve. A plurality of second return springs 71 are fixedly connected between the lower tool holder 6 and the second reset plate 7. A second connecting sleeve is fixedly installed on the second reset plate 7. The telescopic rod of the second hydraulic cylinder 9 passes through the lower tool holder 6 and is fixedly connected to the second connecting sleeve. The first connecting sleeve facilitates the fixed connection between the first hydraulic cylinder 5 and the first reset plate 3; the second connecting sleeve facilitates the fixed connection between the second hydraulic cylinder 9 and the second reset plate 7. This embodiment does not limit the number of first hydraulic cylinders 5 and second hydraulic cylinders 9. Preferably, there are two first hydraulic cylinders 5 and one second hydraulic cylinder 9. Preferably, the two first hydraulic cylinders 5 are located on both sides of the first reset plate 3, and the second hydraulic cylinder 9 is located in the middle of the second reset plate 7.

[0029] When the end of the upper cutter 4 passes through the first reset plate 3 and abuts against the material head, the first reset spring 31 is in a compressed state; when the end of the lower cutter 8 passes through the second reset plate 7 and abuts against the material tail, the second reset spring 71 is in a compressed state.

[0030] Because the thickness of the thin aluminum plate is limited, the first reset plate 3 and the second reset plate 7 can move relative to the thin aluminum plate. That is, the first reset plate 3 applies a downward force to the thin aluminum plate under the elastic force of the first reset spring 31, thereby separating the upper cutter 4 from the thick plate, and the first reset spring 31 is in the extended state (the first reset plate 3 returns to the initial position); the second reset plate 7 applies an upward force to the thin aluminum plate under the elastic force of the second reset spring 71, thereby separating the lower cutter 8 from the thick plate, and the second reset spring 71 is in the extended state (the second reset plate 7 returns to the initial position).

[0031] Because the thick aluminum plate is both thick and hard, the first reset plate 3 and the second reset plate 7 cannot move relative to the thick aluminum plate, meaning the first reset spring 31 and the second reset spring 71 cannot separate the plates, and the upper cutter 4 and the lower cutter 8 remain stuck on the thick aluminum plate. The first hydraulic cylinder 5 is activated, causing the first reset plate 3 to move downwards and press against the thick aluminum plate. The first reset plate 3 applies a downward force to the thick aluminum plate, thus separating the upper cutter 4 from the thick plate, and the first reset spring 31 is in an extended state. The second hydraulic cylinder 9 is activated, causing the second reset plate 7 to move upwards and press against the thick aluminum plate. The second reset plate 7 applies an upward force to the thick aluminum plate, thus separating the lower cutter 8 from the thick plate, and the second reset spring 71 is in an extended state. After the thick aluminum plate separates from the upper cutter 4 and the lower cutter 8, the lower tool holder 6 finally drives the second reset plate 7 and the lower cutter 8 to move downwards synchronously back to their original positions.

[0032] In one possible implementation, multiple first grooves are provided at corresponding positions on the upper tool holder 2 and the first reset plate 3, and the first reset spring 31 is fixedly connected to the first grooves on the upper tool holder 2 and the first reset plate 3; multiple second grooves are provided at corresponding positions on the lower tool holder 6 and the second reset plate 7, and the second reset spring 71 is fixedly connected to the second grooves on the lower tool holder 6 and the second reset plate 7. The first grooves define the position of the first reset spring 31, and the second grooves define the position of the second reset spring 71.

[0033] In one possible implementation, two displacement hydraulic cylinders 11 are fixedly installed on the base 1, located below the upper tool holder 2. The telescopic rods of the two displacement hydraulic cylinders 11 are fixedly connected to the support frame 12 and drive the support frame 12 to move up and down. The lower tool holder 6 is fixedly installed on the support frame 12. When the displacement hydraulic cylinders 11 are activated, they drive the support frame 12 and the lower tool holder 6 to move up and down, thereby driving the second reset plate 7 and the lower tool 8 to move up and down.

[0034] In this embodiment, the displacement hydraulic cylinder 11 is fixed to the machine base 1 by bolts and nuts. The telescopic rod of the displacement hydraulic cylinder 11 is also fixed to the support frame 12 by bolts and nuts. The lower tool holder 6 is also fixed to the support frame 12 by bolts and nuts. The lower tool 8 is also fixed to the lower tool holder 6 by bolts and nuts. The upper tool holder 2 is also fixed to the machine base 1 by bolts and nuts. The upper tool 4 is also fixed to the upper tool holder 2 by bolts and nuts.

[0035] In one possible implementation, a guide post 21 is fixedly mounted on the upper tool holder 2, and a guide groove is provided on the lower tool holder 6 at a position corresponding to the guide post 21. The guide post 21 passes through the guide groove and moves up and down within the guide groove. When the lower tool holder 6 moves up and down relative to the upper tool holder 2, the lower tool holder 6 also moves up and down relative to the guide post 21. The guide post 21 guides the lower tool holder 6, and its up and down movement within the guide groove prevents the lower tool holder 6 from shifting position during its up and down movement, thus avoiding any impact on the threading of the tape.

[0036] The embodiments described above are merely preferred embodiments of this utility model and are only used to explain this utility model. They are not intended to limit the scope of implementation of this utility model. For those skilled in the art, other implementation methods can be easily made by substitution or modification based on the technical content disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A suturing mechanism for a suturing machine comprising a machine base (1), an upper knife holder (2) and a lower knife holder (6), characterized in that, The upper tool holder (2) is fixedly mounted on the machine base (1), and the lower tool holder (6) is movably mounted on the machine base (1) and moves up and down relative to the upper tool holder (2); a first reset plate (3) is movably mounted on the upper tool holder (2), an upper tool (4) and a first hydraulic cylinder (5) are fixedly mounted on the upper tool holder (2), the end of the upper tool (4) passes through or out of the first reset plate (3), and the telescopic rod of the first hydraulic cylinder (5) passes through the upper tool holder (2) and is fixedly connected to the first reset plate (3); a second reset plate (7) is movably mounted on the lower tool holder (6), a lower tool (8) and a second hydraulic cylinder (9) are fixedly mounted on the lower tool holder (6), the end of the lower tool (8) passes through or out of the second reset plate (7), and the telescopic rod of the second hydraulic cylinder (9) passes through the lower tool holder (6) and is fixedly connected to the second reset plate (7).

2. The suturing mechanism for a suturing machine according to claim 1, characterized by, Multiple upper cutters (4) and multiple lower cutters (8) are provided. The multiple upper cutters (4) are arranged in a row along the width direction of the upper cutter holder (2), and the multiple lower cutters (8) are arranged in a row along the width direction of the lower cutter holder (6). The multiple upper cutters (4) and multiple lower cutters (8) are arranged alternately.

3. The suturing mechanism for a suturing machine according to claim 2, wherein, The first reset plate (3) is provided with a plurality of first through holes, and each of the upper cutters (4) is provided with a first protrusion at its end. The first protrusion is an inverted triangle and passes through or out of the first through hole. The second reset plate (7) is provided with a plurality of second through holes, and each of the lower cutters (8) is provided with a second protrusion at its end. The second protrusion is a triangle and passes through or out of the second through hole.

4. The suturing mechanism for a suturing machine according to claim 1, wherein, Multiple first reset springs (31) are fixedly connected between the upper tool holder (2) and the first reset plate (3). A first connecting sleeve is fixedly provided on the first reset plate (3). The telescopic rod of the first hydraulic cylinder (5) passes through the upper tool holder (2) and is fixedly connected to the first connecting sleeve. Multiple second reset springs (71) are fixedly connected between the lower tool holder (6) and the second reset plate (7). A second connecting sleeve is fixedly provided on the second reset plate (7). The telescopic rod of the second hydraulic cylinder (9) passes through the lower tool holder (6) and is fixedly connected to the second connecting sleeve.

5. The suturing mechanism for a suturing machine according to claim 4, wherein, Multiple first grooves are provided at corresponding positions on the upper tool holder (2) and the first reset plate (3), and the first reset spring (31) is fixedly connected in the first grooves on the upper tool holder (2) and the first reset plate (3); multiple second grooves are provided at corresponding positions on the lower tool holder (6) and the second reset plate (7), and the second reset spring (71) is fixedly connected in the second grooves on the lower tool holder (6) and the second reset plate (7).

6. The suturing mechanism for a suturing machine according to claim 1, wherein, Two displacement hydraulic cylinders (11) are fixedly installed on the base (1) below the upper tool holder (2). The telescopic rods of the two displacement hydraulic cylinders (11) are fixedly connected to the support frame (12) and drive the support frame (12) to move up and down. The lower tool holder (6) is fixedly installed on the support frame (12).

7. The suturing mechanism for a suturing machine according to claim 6, wherein The upper knife seat (2) is fixedly provided with a guide column (21), and the lower knife seat (6) is provided with a guide groove at a position corresponding to the guide column (21); the guide column (21) penetrates into the guide groove, and the guide column (21) moves up and down in the guide groove.

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