Lower point grinding device

Abstract

The present application discloses a lower control point grinding device, comprising a seat body, provided with an accommodating cavity for accommodating the lower control point; a positioning mechanism, comprising a stripping plate and a limiting assembly for limiting the lower control point, the stripping plate and the limiting assembly limit the lower control point so that the lower control point has only one degree of freedom away from the stripping plate; a material picking mechanism, comprising a material picking column and a driving mechanism for driving the material picking column to move, the driving mechanism is used to drive the material picking column to move in a first direction close to or away from the seat body and in a second direction between the seat body and the positioning mechanism, the material picking column is used to interference fit with a non-closed hole to pick up the lower control point; a grinding mechanism, comprising a polishing head for grinding a grinding surface; in a grinding state, the lower control point is limited on the positioning mechanism and the grinding surface is away from the stripping plate, the lower control point is located between the stripping plate and the polishing head, the polishing head and the positioning mechanism move relative to each other in a third direction, the third direction is perpendicular to the first direction, and the present application has the effects of accurate positioning and high grinding efficiency.

Description

Technical Field

[0001] The present application relates to the field of mechanical technology, and in particular to a lower point grinding device. Background Art

[0002] The bottom dead center is an accessory used in the head of the embroidery machine, also known as the bottom dead center. When working, the bottom dead center and the needle bar make reciprocating motions up and down. The needle bar is connected to the presser foot. When the bottom dead center and the needle bar make reciprocating motions, the spring will be compressed, and the presser foot will be driven by the spring to achieve intermittent compression of the fabric. Figure 1 As shown, the lower control point includes a main body and a prism connected to the main body, the main body is provided with a non-enclosed hole for the needle rod to pass through, the prism has a grinding surface for contacting with external components to achieve linkage, and the grinding surface is perpendicular to the central axis of the non-enclosed hole. In order to ensure the matching accuracy, the grinding surface needs to be processed. At present, the consistency of manual processing accuracy is poor and the efficiency is low. Summary of the invention

[0003] The present application provides a bottom-point grinding device, which can improve processing accuracy and processing efficiency and meet the needs of mass production.

[0004] A lower control point grinding device is used for grinding a lower control point, the lower control point comprises a main body and a prism connected to the main body, the main body is provided with a non-enclosed hole, the prism has a grinding surface, and the grinding surface is perpendicular to the central axis of the non-enclosed hole. The lower control point grinding device comprises:

[0005] A seat body, provided with a receiving cavity for receiving the lower control point;

[0006] A positioning mechanism, comprising a stripper plate and a limiting assembly for limiting the lower control point, wherein the stripper plate and the limiting assembly limit the lower control point so that the lower control point has only one degree of freedom away from the stripper plate;

[0007] A material picking mechanism, comprising a material picking column and a driving mechanism for driving the material picking column to move, wherein the driving mechanism is used to drive the material picking column to move in a first direction close to or away from the seat body and in a second direction between the seat body and the positioning mechanism, and the material picking column is used to be interference-fitted with the non-enclosed hole to pick up the lower control point;

[0008] A grinding mechanism, comprising a polishing head for grinding the grinding surface;

[0009] Wherein, in the grinding state, the lower control point is defined on the positioning mechanism and the grinding surface is away from the stripping plate, the lower control point is located between the stripping plate and the polishing head, and the polishing head and the positioning mechanism move relative to each other in a third direction, which is perpendicular to the first direction.

[0010] By adopting the above technical scheme, the picking mechanism can transfer the lower control point in the base body to the positioning mechanism. The stripping plate and the limiting assembly of the positioning mechanism limit the lower control point with five degrees of freedom, and the lower control point can move in the direction perpendicular to the upper surface of the stripping plate. When the grinding surface of the lower control point is ground, the lower control point is located between and abuts the stripping plate and the polishing head. The polishing head limits the movement of the lower control point in the direction away from the stripping plate and performs grinding. The polishing head and the positioning mechanism move relative to each other in the third direction, and the flatness of the entire surface of the grinding surface can be achieved. This scheme can realize motorized picking, limiting and grinding, improve processing efficiency and processing quality, almost ensure the consistency of product quality, and can meet the needs of mass production.

[0011] According to a further solution, the positioning mechanism also includes a fixed seat and a stripping drive connected to the fixed seat, the limiting assembly is fixedly connected to the fixed seat, the limiting assembly is slidably connected to the stripping plate, and the stripping drive is used to drive the stripping plate to move along the first direction relative to the limiting assembly.

[0012] By adopting the above technical solution, the limit assembly is slidably connected to the stripper plate, which can not only realize the position limitation of the lower control point during the grinding process, but also can drive the stripper plate to move relative to the limit assembly through the stripper drive member to separate the lower control point from the limit assembly when the grinding process is completed, and clean and collect the processed lower control points from the positioning mechanism to facilitate the positioning processing of the next batch of lower control points. In order to ensure the accuracy during the grinding process, the limit assembly fixes the lower control point tightly, which is difficult to disassemble manually. Through this solution, automatic unloading can be achieved, which improves the processing efficiency.

[0013] According to a further solution, the limiting assembly includes a positioning column for cooperating with the non-closed hole and a limiting column for limiting the rotation of the prism, the positioning column and the limiting column are both fixedly connected to the fixed seat, and the stripping plate is provided with an avoidance hole for the positioning column and the limiting column to pass through.

[0014] By adopting the above technical solution, the lower control point is limited in position by inserting the positioning column into the non-enclosed hole, and the lower control point is limited in rotation by the limit column. The positioning structure is simple, which is convenient for taking and placing the lower control point. The avoidance hole set in the stripping plate is slidably connected with the positioning column and the limit column, which is convenient for disassembling and separating the lower control point from the limit assembly.

[0015] In a further solution, the limiting assembly also includes a lifting block, the lifting block is fixedly connected to the fixed seat and the stripping plate is provided with an avoidance hole for the lifting block to pass through, the lifting block is located between the positioning column and the limiting column, when the main body of the lower control point abuts against the stripping plate in the limiting state, the lifting block abuts against the prism to make the grinding surface parallel to the third direction, and the limiting column is lower than the grinding surface.

[0016] By adopting the above technical solution, the design of the top block can keep the grinding surface of the lower control point parallel to the third direction, thereby improving the processing accuracy. It can also provide force support for the lower control point during grinding, reduce the position change of the lower control point during grinding, and maintain the consistency of processing quality.

[0017] In a further solution, the seat body is provided with a guide rail, the fixed seat is slidably connected to the guide rail in the third direction, the fixed seat is fixedly connected with a material guide plate, and the material guide plate corresponds to the stripping plate.

[0018] By adopting the above technical solution, the sliding connection between the fixed seat and the guide rail can realize the movement of the positioning mechanism, and the guide plate corresponds to the stripping plate, which is convenient for the lower control point to be collected through the guide plate when it is detached from the stripping plate.

[0019] In a further solution, the seat body is also connected to a push drive member, the driving end of which is fixedly connected to a push plate, and the push drive member is located on the side of the third direction away from the material picking mechanism, and the push drive member drives the push plate to move perpendicular to the first direction and the third direction.

[0020] By adopting the above technical solution, after the grinding process is completed, the fixed seat moves along the guide rail to the position of the pusher drive member, and the pusher drive member can drive the push plate to push the lower control point on the stripper plate to separate from the stripper plate.

[0021] In a further solution, the stripping drive member drives the stripping plate to have a limiting position and a stripping position in the first direction, and in the stripping position, the upper surface of the stripping plate is substantially flush with the lower surface of the push plate.

[0022] By adopting the above technical solution, at the limit position, the stripping plate and the limit assembly limit the lower control point, and at the stripping position, the push plate pushes the lower control point on the upper surface of the stripping plate away from the stripping plate under the drive of the push drive member.

[0023] According to a further solution, the material picking mechanism further includes a material picking drive and a material picking plate connected to a driving end of the material picking drive, the material picking plate is slidably connected to the material picking column, and the material picking drive is used to drive the material picking plate to move in the first direction.

[0024] By adopting the above technical solution, the material picking column picks up the lower control point through interference fit with the lower control point, and the material unloading drive drives the unloading plate to move, so that the lower control point on the material picking column can be pushed away from the material picking column. The material picking mechanism picks up the lower control point from the seat body and moves it to the positioning mechanism position, and the material unloading drive drives the unloading plate to push the lower control point on the material picking column and press it onto the positioning mechanism, thereby realizing the unloading and unloading in one go, simplifying the working steps and improving the production efficiency.

[0025] According to a further solution, a plurality of groups of limit assemblies are provided in the third direction, and an arrangement direction of the plurality of groups of limit assemblies is parallel to the third direction.

[0026] By adopting the above technical solution, multiple bottom points can be ground at one time, which improves work efficiency and ensures the consistency of batch processing.

[0027] According to a further solution, the widths of the guide plate and the push plate are both greater than the lengths of the arrangement of the multiple groups of limit components, and when the stripping plate is located at the stripping position, the guide plate is not higher than the upper surface of the stripping plate, and the stripping plate corresponds to the position of the push plate, and the push plate pushes the lower control point on the stripping plate onto the guide plate.

[0028] By adopting the above technical solution, the processed lower processing points can be smoothly pushed into the guide plate through the push plate for aggregation and collection.

[0029] In summary, the present application has at least one of the following beneficial technical effects:

[0030] 1. High processing precision: Through precise positioning mechanism and stable grinding mechanism, the stability and processing precision of the lower control point during the grinding process are guaranteed, which can achieve good positioning, stable processing quality and good product consistency.

[0031] 2. High degree of automation: Through the coordinated action of various mechanisms, automatic material picking, positioning and grinding of the lower processing points are realized, which significantly improves production efficiency and can meet the needs of mass production.

[0032] 3. Strong adaptability: By setting up multiple sets of limit components and adjustable stripping plates, guide plates and other structures, the lower point grinding device of the present application can adapt to the lower point processing requirements of different specifications and sizes, and has strong adaptability.

[0033] 4. Compact structure and reasonable layout: The layout of each mechanism is compact and reasonable, which makes the whole device occupy a small area and has high space utilization, which is conducive to reducing production costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural diagram of the next control point;

[0035] Figure 2 It is a three-dimensional schematic diagram of the lower point grinding device;

[0036] Figure 3 yes Figure 2 Enlarged schematic diagram of area A in the middle;

[0037] Figure 4 is a schematic diagram of the structure of the lower point grinding device from the rear side perspective;

[0038] Figure 5 yes Figure 4 Enlarged schematic diagram of area B in the middle;

[0039] Figure 6 It is a structural diagram of the material taking mechanism and the positioning mechanism;

[0040] Figure 7 yes Figure 6 Enlarged schematic diagram of the middle C area;

[0041] Figure 8 It is a three-dimensional cross-sectional schematic diagram of the front side view of the point grinding device under the present application;

[0042] Fig. 9 yes Figure 8 Magnified view of area D in .

[0043] Reference numerals:

[0044] 1. Lower control point; 11. Main body; 111. Non-enclosed hole; 12. Prism; 121. Grinding surface; 2. Seat; 21. Accommodating cavity; 22. Guide rail; 23. Slide; 3. Material taking mechanism; 31. Moving drive member; 32. Material taking drive member; 321. Material taking column; 33. Material unloading drive member; 34. Material unloading plate; 4. Grinding mechanism; 41. Polishing head; 42. Sensor; 5. Positioning mechanism; 51. Fixed seat; 511. Positioning column; 512. Limiting column; 513. Material ejecting block; 514. Material guide plate; 52. Material stripping drive member; 53. Material stripping plate; 6. Material pushing mechanism; 61. Material pushing drive member; 62. Pushing plate; 7. Vibrating disk; 71. Material feeding channel. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention described and shown in the accompanying drawings can be arranged and designed in various configurations. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present application, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0049] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other. Embodiment 1

[0050] See also Figure 2 and Figure 3 , discloses a structure of an embodiment of a lower control point grinding device, the lower control point grinding device includes a base 2, a positioning mechanism 5, a material taking mechanism 3, a grinding mechanism 4, a material pushing mechanism 6 and a vibration plate 7. The base 2 is provided with a receiving cavity 21 for accommodating the lower control point 1, the positioning mechanism 5 includes a stripping plate 53 and a limiting assembly for limiting the lower control point 1, the stripping plate 53 and the limiting assembly limit the lower control point 1 so that the lower control point 1 has only one degree of freedom away from the stripping plate 53. The grinding mechanism 4 includes a grinding surface 121 (reference Figure 1 ) is used for grinding with a polishing head 41. The vibrating plate 7 delivers the lower points 1 arranged in a certain pattern to the accommodating cavity 21 through the feeding channel 71.

[0051] In the grinding state, the lower control point 1 is defined on the positioning mechanism 5 and the grinding surface 121 is away from the stripper plate 53. The lower control point 1 is located between the stripper plate 53 and the polishing head 41, and the polishing head 41 and the positioning mechanism 5 move relative to each other in a third direction, which is perpendicular to the first direction.

[0052] The positioning mechanism 5 also includes a fixed seat 51 and a stripping drive 52 connected to the fixed seat 51. The stripping drive 52 is a cylinder, and can also be driven by a motor according to actual needs. The limit assembly is fixedly connected to the fixed seat 51, and the limit assembly is slidably connected to the stripping plate 53. The stripping drive 52 is used to drive the stripping plate 53 to move relative to the limit assembly along the first direction. Figure 1 The limiting assembly includes a positioning column 511 for cooperating with the non-enclosed hole 111 of the lower control point 1, a limiting column 512 for limiting the rotation of the prism 12, and a top block 513 for supporting the prism 12. The positioning column 511, the top block 513 and the limiting column 512 are all fixedly connected to the fixed seat 51. The stripping plate 53 is provided with an avoidance hole for the positioning column 511, the limiting column 512 and the top block 513 to pass through, so that the positioning column 511, the limiting column 512 and the top block 513 can slide relative to the stripping plate 53. The top block 513 is located between the positioning column 511 and the limiting column 512, refer to Figure 1 When the main body 11 of the upper and lower control points 1 abuts against the stripping plate 53 in the limiting state, the top block 513 abuts against the prism 12 so that the grinding surface 121 is parallel to the third direction, and the limiting column 512 is lower than the grinding surface 121 so as not to affect the processing of the grinding surface 121 of the lower control point 1 during grinding.

[0053] The seat body 2 is provided with a guide rail 22 , and the fixing seat 51 is slidably connected to the guide rail 22 in the third direction.

[0054] In order to improve the processing efficiency, a plurality of limit components are provided in the third direction, and the arrangement direction of the plurality of limit components is parallel to the third direction.

[0055] See also Figure 4-Figure 7 The material picking mechanism 3 includes a material picking column 321 and a driving mechanism for driving the material picking column 321 to move. The driving mechanism includes a material picking driving member 32. The material picking driving member 32 is used to drive the material picking column 321 to move in a first direction close to or away from the base body 2 and in a second direction between the base body 2 and the positioning mechanism 5. The material picking driving member 32 is a cylinder.

[0056] See also Figure 6 and Figure 7 The material picking mechanism 3 also includes a material removal driving member 33 and a material removal plate 34 connected to the driving end of the material removal driving member 33. The material removal plate 34 is slidably connected to the material removal column 321. The material removal driving member 33 is used to drive the material removal plate 34 to move in the first direction. The material removal driving member 33 is a cylinder.

[0057] refer to Figure 1 , Figure 5 and Figure 7The material picking column 321 is used to be interference fit with the non-enclosed hole 111 to pick up the lower control point 1. The material picking driving member 32 drives the material picking column 321 to move close to the accommodating cavity 21 on the base body 2, and the material picking column 321 is inserted into the non-enclosed hole 111. The material picking driving member 32 drives the material picking column 321 to move away from the base body 2, and the lower control point 1 moves together with the material picking column 321.

[0058] See also Figure 3 and Figure 5 The mobile driving member 31 drives the material taking driving member 32, the material discharging driving member 33 and the material taking column 321 to move above the stripping plate 53. The material taking driving member 32 drives the material taking column 321 to move close to the stripping plate 53. When the material taking column 321 and the positioning column 511 are aligned, the material discharging driving member 33 drives the discharging plate 34 to move close to the stripping plate 53 and presses the lower control point 1 onto the stripping plate 53. Figure 1 At this time, the non-enclosed hole 111 is inserted into the positioning column 511, the prism 12 is stuck between the two limiting columns 512, the main body 11 of the lower control point 1 is in contact with the stripping plate 53, and the prism 12 is in contact with the top block 513. The lower control point 1 only has a first degree of freedom away from the stripping plate 53 (reference Figure 2 ).

[0059] See also Figure 8 , Fig. 9 The seat body 2 is also connected to a pushing mechanism 6, which includes a pushing drive member 61. The driving end of the pushing drive member 61 is fixedly connected to a push plate 62. The pushing drive member 61 is located on the side away from the material taking structure in the third direction. The pushing drive member 61 drives the push plate 62 to move perpendicularly in the first direction and the third direction. The stripping drive member 52 drives the stripping plate 53 to have a limiting position and a stripping position in the first direction. In the limiting position, the lower control point 1 is limited on the stripping plate 53. In the stripping position, the lower control point 1 is separated from the positioning column 511 under the push of the stripping plate 53, and the upper surface of the stripping plate 53 is substantially flush with the lower surface of the push plate 62.

[0060] See also Fig. 9 The fixed seat 51 is fixedly connected with a guide plate 514, and the guide plate 514 is arranged correspondingly with the stripper plate 53. The widths of the guide plate 514 and the push plate 62 are both greater than the lengths of the multiple groups of limit components. When the stripper plate 53 is in the stripping position, the guide plate 514 is not higher than the upper surface of the stripper plate 53. The stripper plate 53 and the push plate 62 are in corresponding positions, and the push plate 62 pushes the lower control point 1 on the stripper plate 53 onto the guide plate 514. Figure 2 The lower processing point 1 slides from the guide plate 514 to the slide 23, and is discharged from the slide 23 and collected uniformly or flows into the next process. Embodiment 2

[0061] See also Figure 2 and 3, which is different from the first embodiment, is that it further includes a sensor 42, which is fixed on the base 2. After the lower control point 1 is placed on the stripping plate 53 for positioning, the sensor 42 corresponds to the lower control point 1 to determine whether the lower control point 1 is placed in place or whether there is a lower control point 1 on the stripping plate 53. After the sensor 42 detects that the lower control point 1 is placed in place, it transmits a signal to the control device, and the control device transmits the signal to the grinding mechanism 4 and the positioning mechanism 5. The positioning mechanism 5 reciprocates along the guide rail 22, and the grinding mechanism 4 drives the polishing head 41 to perform grinding.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes, modifications, substitutions and variants, and these changes, modifications, substitutions and variants all fall within the scope of the present invention claimed for protection.

Claims

1. A lower point grinding device for grinding a lower point (1), characterized in that: The lower control point (1) comprises a main body (11) and a prism (12) integrally connected to the main body (11), the main body (11) is provided with a non-enclosed hole (111), the prism (12) has a grinding surface (121), and the grinding surface (121) is perpendicular to the central axis of the non-enclosed hole (111). The lower control point grinding device comprises: The seat body (2) is provided with a receiving cavity (21) for receiving the lower control point (1); A positioning mechanism (5), comprising a stripping plate (53) and a limiting assembly for limiting the lower control point (1), wherein the stripping plate (53) and the limiting assembly limit the lower control point (1) so that the lower control point (1) has only one degree of freedom away from the stripping plate (53), and the limiting assembly further comprises a lifting block (513), a positioning column (511) for cooperating with the non-enclosed hole (111), and a limiting column (512) for limiting the rotation of the prism (12); A material picking mechanism (3), comprising a material picking column (321) and a driving mechanism for driving the material picking column (321) to move, wherein the driving mechanism is used to drive the material picking column (321) to move in a first direction approaching or moving away from the base (2) and in a second direction between the base (2) and the positioning mechanism (5), and the material picking column (321) is used to be interference-fitted with the non-enclosed hole (111) to pick up the lower control point (1); A grinding mechanism (4), comprising a polishing head (41) for grinding the grinding surface (121); Wherein, in the grinding state, the lower control point (1) is limited on the positioning mechanism (5) and the grinding surface (121) is away from the stripping plate (53), the lower control point (1) is located between the stripping plate (53) and the polishing head (41), the polishing head (41) and the positioning mechanism (5) move relative to each other in a third direction, and the third direction is perpendicular to the first direction. When the main body (11) of the lower control point (1) abuts against the stripping plate (53) in the limited state, the top block (513) abuts against the prism (12) so that the grinding surface (121) is parallel to the third direction.

2. The lower point grinding device according to claim 1, characterized in that: The positioning mechanism (5) also includes a fixed seat (51) and a stripping drive member (52) connected to the fixed seat (51), the limiting assembly is fixedly connected to the fixed seat (51), the limiting assembly is slidably connected to the stripping plate (53), and the stripping drive member (52) is used to drive the stripping plate (53) to move relative to the limiting assembly along the first direction.

3. The lower point grinding device according to claim 2, characterized in that: The positioning column (511) and the limiting column (512) are both fixedly connected to the fixing seat (51), and the stripping plate (53) is provided with an avoidance hole for the positioning column (511) and the limiting column (512) to pass through.

4. The lower point grinding device according to claim 3, characterized in that: The ejecting block (513) is fixedly connected to the fixing seat (51) and the stripping plate (53) is provided with an avoidance hole for the ejecting block (513) to pass through. The ejecting block (513) is located between the positioning column (511) and the limiting column (512), and the limiting column (512) is lower than the grinding surface (121).

5. The lower point grinding device according to claim 2, characterized in that: The seat body (2) is provided with a guide rail (22), the fixed seat (51) is slidably connected to the guide rail (22) in the third direction, the fixed seat (51) is fixedly connected with a material guide plate (514), and the material guide plate (514) corresponds to the stripping plate (53).

6. The lower point grinding device according to claim 5, characterized in that: The seat body (2) is also connected to a material pushing driving member (61), the driving end of which is fixedly connected to a push plate (62), and the material pushing driving member (61) is located on a side away from the material taking mechanism (3) in the third direction, and the material pushing driving member (61) drives the push plate (62) to move perpendicularly to the first direction and the third direction.

7. The lower point grinding device according to claim 6, characterized in that: The stripping drive member (52) drives the stripping plate (53) to have a limiting position and a stripping position in the first direction. At the stripping position, the upper surface of the stripping plate (53) is substantially flush with the lower surface of the push plate (62).

8. The bottom point grinding device according to claim 1, characterized in that: The material picking mechanism (3) also includes a material picking drive member (33) and a material picking plate (34) connected to the driving end of the material picking drive member (33), the material picking plate (34) is slidably connected to the material picking column (321), and the material picking drive member (33) is used to drive the material picking plate (34) to move in the first direction.

9. The bottom point grinding device according to any one of claims 1 to 8, characterized in that: A plurality of groups of limit assemblies are provided in the third direction, and the arrangement direction of the plurality of groups of limit assemblies is parallel to the third direction.

10. The lower point grinding device according to claim 9 as referred to claim 7, characterized in that: The widths of the guide plate (514) and the push plate (62) are both greater than the lengths of the arrangement of the multiple groups of limit components. When the stripping plate (53) is located at the stripping position, the guide plate (514) is not higher than the upper surface of the stripping plate (53). The stripping plate (53) corresponds to the position of the push plate (62). The push plate (62) pushes the lower control point (1) on the stripping plate (53) onto the guide plate (514).

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