Lead feeding and cutting mechanism for semiconductor devices

Abstract

The utility model belongs to the technical field of semiconductor device auxiliary production equipment, specifically relates to a kind of lead feeding and cutting mechanism of semiconductor device.It includes drive roll, is set along parallel to wire conveying direction, and first drive cam, second drive cam and third drive cam are set with interval on drive roll;Clamping assembly includes first clamping unit and second clamping unit, which are set with interval along wire conveying direction, and first clamping unit and second clamping unit respectively with first drive cam and second drive cam abut, for alternatively opening and closing clamping wire;Propelling device is set to clamping assembly upstream, and its acting end is connected with first clamping unit;Cutting unit is set to clamping assembly downstream, and cutting unit is abutted with third drive cam.The utility model is used to solve the problem that previous feeding and cutting mechanism occupies larger space on machine.

Description

Technical Field

[0001] This utility model belongs to the technical field of semiconductor device auxiliary production equipment, specifically relating to a semiconductor device lead feeding and cutting mechanism. Background Technology

[0002] A diode is one of the simplest semiconductor devices, consisting of a PN junction, electrode leads, and a package. It is a two-terminal electronic device with unidirectional conductivity. The diode leads are metallic conductor structures that connect the internal PN junction of the diode to the external circuit, and are usually made of highly conductive materials.

[0003] Currently, during the lead wire feeding and cutting process, wire clamping dies are usually used to hold the wire. Two wire clamping dies are driven by a drive device to move one of them back and forth, and then the other drive device drives the cutting unit to cooperate with the wire clamping die to cut the wire it holds.

[0004] As a result, not only will the two drive devices occupy a larger area, making the structure around the entire cutting mechanism complex and taking up a lot of space, but the different drive routes will also lead to low synchronization between the cutting and clamping mold movements, which can easily result in inaccurate cutting. Utility Model Content

[0005] To address the shortcomings of existing technologies, a semiconductor device lead feeding and cutting mechanism is provided to solve the problem of large space occupation on the machine tool by previous feeding and cutting mechanisms.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A semiconductor device lead feeding and cutting mechanism, comprising: A drive roller is arranged parallel to the wire conveying direction, and a first drive cam, a second drive cam, and a third drive cam are spaced apart on the drive roller; The clamping assembly includes a first clamping unit and a second clamping unit spaced apart along the wire conveying direction. The first clamping unit and the second clamping unit respectively abut against the first drive cam and the second drive cam for alternately opening and closing the wire. A propulsion device is located upstream of the clamping assembly, and its working end is connected to the first clamping unit, which is used to drive the first clamping unit to move closer to or away from the second clamping unit. A cutting unit is disposed downstream of the clamping assembly. The cutting unit abuts against the third drive cam and is used to cut the wire when the second clamping unit clamps the wire.

[0007] Compared with existing technologies, the above technical solutions have the following beneficial effects: By setting a drive roller and three drive cams spaced apart on the drive roller, the drive cams on the same roller can synchronously drive the clamping component and the cutting unit, achieving high initial synchronization accuracy. Furthermore, the layout of setting the drive roller on one side results in a compact structure with a small footprint.

[0008] Based on the above technical solution, the embodiments of this application can be further improved as follows: In one embodiment, the first clamping unit and the second clamping unit have the same structure, wherein the first clamping unit includes: A clamping base, wherein a first die head and a second die head for clamping wires are slidably disposed; The first lever is rotatably connected to the clamping seat, and the first end of the first lever abuts against the first mold head or the second mold head to push the two mold heads to stick together or separate. The second lever has its first end abutting against the second end of the first lever, and its second end abutting against the first drive cam.

[0009] In one embodiment, a first reset member is also included. The first reset member is disposed on the side of the second end of the first lever that is different from the second lever, and is used to push the second end of the first lever toward the direction of the second lever.

[0010] In one embodiment, an extension plate is provided at the second end of the first lever along the wire conveying direction; The first end of the second lever is rotatably provided with a wheel, the rotation axis of the wheel is perpendicular to the direction of the wire, and the circumferential surface of the wheel abuts against the surface of the extension plate.

[0011] In one embodiment, a waist-shaped hole is provided on the first end of the second lever, the length direction of the waist-shaped hole is directed towards the second end of the first lever, a connecting bolt is passed through the waist-shaped hole, a connecting block is connected to the end of the connecting bolt, and the wheel is rotatably connected to the connecting block.

[0012] In one embodiment, a limiting strip is provided on the first end of the second lever on the side of the connecting block away from the first lever, and an adjusting bolt is screwed onto the limiting strip, with the end of the adjusting bolt abutting against the surface of the connecting block on the side away from the first lever.

[0013] In one embodiment, the cutting unit includes: A guide member, wherein a guide groove is provided in the guide member perpendicular to the direction of the wire; A guide block is slidably disposed in the guide groove, and one end of the guide block abuts against the third drive cam. A conduit is disposed in the guide block at one end away from the third drive cam, and the conduit is on the same straight line as the wire in the clamping unit. The second reset member is disposed at the end of the guide block away from the third drive cam, and is used to push the end of the guide block against the third drive cam. Attached Figure Description

[0014] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 for Figure 1 A structural diagram from another perspective.

[0017] Figure 3 This is a schematic diagram showing the connection between the propulsion device and the sliding mechanism in this utility model.

[0018] Figure label: 1. Drive roller; 2. First drive cam; 3. Second drive cam; 4. Third drive cam; 5. First clamping unit; 6. Second clamping unit; 7. Pushing device; 8. Cutting unit; 9. Wire; 501. Clamping seat; 502. First mold head; 503. Second mold head; 504. First lever; 505. Second lever; 506. First reset component; 507. Extension plate; 508. Rotary wheel; 509. Oblong hole; 510. Connecting bolt; 511. Connecting block; 512. Limiting strip; 513. Adjusting bolt; 701 Drive shaft; 702 Limiting frame; 703 Slide groove; 704 Slider; 705 Limiting component; 706 Driven shaft; 707 Linkage mechanism; 708 Pad; 709 Sliding mechanism; 710 Bearing housing; 7091, slide block; 7092, slide table; 7093, limiting groove; 7094, limiting protrusion; 7095, oblong hole; 7096, boss; 801. Guide component; 802. Guide groove; 803. Guide block; 804. Conduit; 805. Second reset component. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention. It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0020] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Example like Figure 1-3 As shown, the present invention provides a semiconductor device lead feeding and cutting mechanism, which includes: a drive roller 1, a clamping assembly, a pushing device 7, and a cutting unit 8.

[0024] The drive roller 1 is arranged parallel to the conveying direction of the wire 9, that is, the wire 9 is arranged horizontally. The drive roller 1 is also arranged horizontally. The drive roller 1 is provided with a first drive cam 2, a second drive cam 3 and a third drive cam 4 at intervals. The high point positions of the first drive cam 2 and the second drive cam 3 are opposite. The high point position of the second drive cam 3 is opposite to the high point position of the third drive cam 4. The opposite means that at the same point of the drive cams, when one of the drive cams is at a high point, the opposite drive cam is at a low point.

[0025] The clamping assembly includes a first clamping unit 5 and a second clamping unit 6 arranged at intervals along the conveying direction of the wire 9. The first clamping unit 5 and the second clamping unit 6 respectively abut against the first driving cam 2 and the second driving cam 3 to alternately open and close the clamping of the wire 9. Since the opening and closing times of the first clamping unit 5 and the second clamping unit 6 are opposite, the high point positions of the first driving cam 2 and the second driving cam 3 are set to be opposite.

[0026] The propulsion device 7 is located upstream of the clamping assembly, and its working end is connected to the first clamping unit 5. It is used to drive the first clamping unit 5 to move closer to or away from the second clamping unit 6. Specifically, the propulsion device 7 is used to reciprocate to propel the first clamping unit 5.

[0027] The cutting unit 8 is located downstream of the clamping assembly. The cutting unit 8 abuts against the third drive cam 4 and is used to cut the wire 9 when the second clamping unit 6 clamps the wire 9.

[0028] By setting a drive roller 1 and three drive cams spaced apart on the drive roller 1, the drive cams on the same roller can synchronously drive the clamping component and the cutting unit 8 to achieve high initial synchronization accuracy. The layout of the drive roller 1 on one side achieves a compact structure and small space occupation.

[0029] In this embodiment, the first clamping unit 5 and the second clamping unit 6 have the same structure. The first clamping unit 5 includes a clamping seat 501, a first lever 504, and a second lever 505.

[0030] The clamping base 501 is slidably provided with a first die head 502 and a second die head 503 for clamping the wire 9. Specifically, the first die head 502 and the second die head 503 are arranged vertically, and the wire 9 passes between the two dies. A longitudinal slide is formed in the clamping base 501, which can provide space for the first die head 502 and the second die head 503 to move slightly up and down, so that the first die head 502 and the second die head 503 can approach each other to clamp the wire 9, and separate each other to release the wire 9.

[0031] The first lever 504 is rotatably connected to the clamping seat 501. The first end of the first lever 504 abuts against the first die head 502 or the second die head 503 to push the two dies head to stick together or separate. In this embodiment, the bottom of the first end of the first lever 504 has a contact rod that passes through the clamping seat 501 and contacts the upper die head. When the first end of the first lever 504 deflects downward, it pushes the two dies head to clamp the wire 9.

[0032] The first end of the second lever 505 abuts against the second end of the first lever 504, and its second end abuts against the first drive cam 2. The first drive cam 2 is located below the second end of the second lever 505, thereby controlling the rotation of the second lever 505 through the high and low points of the first drive cam 2, and thus controlling the rotation of the first lever 504. When the first drive cam 2 is at its highest point, it causes the first end of the second lever 505 that is in contact with the first lever 504 to deflect downward, thereby pushing the first end of the first lever 504 to deflect upward. At this time, the first clamping unit 5 is in a released state. Conversely, when the first drive cam 2 enters its lowest point, the first clamping unit 5 is in a clamping state.

[0033] Correspondingly, the second end of the second lever 505 in the second clamping unit 6 abuts against the second drive cam 3. Since the high and low points of the first drive cam 2 and the second drive cam 3 are opposite, when the first clamping unit 5 clamps the wire 9, the second clamping unit 6 releases the wire 9. In the opposite way, it can cooperate with the push device 7 to feed the wire 9 forward.

[0034] Specifically, when the pushing device 7 moves forward to the first clamping unit 5, the first clamping unit 5 clamps the wire 9, and the second clamping unit 6 releases the wire 9. When the pushing device 7 retracts and drives the first clamping unit 5 to retract, the first clamping unit 5 releases the wire 9, and the second clamping unit 6 clamps the wire 9 to prevent the wire 9 from retracting and thus achieves the function of feeding the wire.

[0035] To ensure that the second end of the second lever 505 in the two clamping units is always in contact with the drive cam, a first reset member 506 is also included. The first reset member 506 is disposed on the side of the second end of the first lever 504 that is different from the second lever 505, and is used to push the second end of the first lever 504 toward the second lever 505. The first reset member 506 can be implemented by a compression spring. The first reset member 506 can push the first end of the second lever 505 upward, thereby ensuring that the second end of the second lever 505 is always in contact with the circumferential surface of the drive cam.

[0036] In this embodiment, to ensure smooth abutment rotation, a small rotating wheel 508 is provided on the second end of the second lever 505 to contact the circumferential surface of the drive cam.

[0037] In another embodiment, since the first clamping unit 5 needs to move back and forth along the direction of the wire 9, the second end of the first lever 504 is provided with an extension plate 507 along the conveying direction of the wire 9. The first end of the second lever 505 is rotatably provided with a rotating wheel 508. The rotation axis of the rotating wheel 508 is perpendicular to the direction of the wire 9. The circumferential surface of the rotating wheel 508 abuts against the surface of the extension plate 507. That is, during the reciprocating movement of the first clamping unit 5, the rotating wheel 508 on the second lever 505 is always in contact with the extension plate 507, ensuring the continuity of clamping and releasing actions during the movement.

[0038] To achieve adjustable clamping and loosening, a waist-shaped hole 7095509 is provided on the first end of the second lever 505. The length direction of the waist-shaped hole 7095509 points to the second end of the first lever 504, that is, the length direction of the waist-shaped hole 7095509 is vertical. A connecting bolt 510 passes through the waist-shaped hole 7095509. A connecting block 511 is connected to the end of the connecting bolt 510. The rotating wheel 508 is rotatably connected to the connecting block 511, so that the connecting block 511 can drive the rotating wheel 508 to adjust up and down, thereby controlling the distance between the first end of the second lever 505 and the second end of the first lever 504, and thus controlling the angle range of the first lever 504 during the rotation of the second lever 505.

[0039] To ensure the stability of the connecting block 511, a limiting strip 512 is provided on the first end of the second lever 505 on the side of the connecting block 511 away from the first lever 504. The limiting strip 512 is located above the connecting block 511 and is fixedly connected to the second lever 505. An adjusting bolt 513 is screwed onto the limiting strip 512. The end of the adjusting bolt 513 abuts against the surface of the connecting block 511 on the side away from the first lever 504. The connecting block 511 can be tightened by adjusting the bolt 513.

[0040] In this embodiment, the cutting unit 8 includes: a guide member 801, a guide block 803, a threading tube 804, and a second reset member 805.

[0041] The guide member 801 is provided with a guide groove 802 perpendicular to the direction of the wire 9. The guide block 803 is slidably disposed in the guide groove 802. One end of the guide block 803 abuts against the third drive cam 4. The wire tube 804 is disposed in the guide block 803 at the end away from the third drive cam 4. The wire tube 804 and the wire 9 in the clamping unit are on the same straight line, so that the wire 9 can pass straight through the wire tube 804. When the wire tube 804 is pushed by the guide block 803, the wire tube 804 completes the cutting.

[0042] Since the high and low points of the third drive cam 4 are opposite to those of the second drive cam 3, when the third drive cam 4 reaches its high point, it pushes the guide block 803 to move in a direction perpendicular to the wire 9 to complete the cutting. At this time, the second drive cam 3 is at its low point. The first end of the second lever 505 in the second clamping unit 6 deflects upward and the first end of the first lever 504 deflects downward, abutting against the two die heads to clamp the wire 9, thus completing the cutting action.

[0043] Specifically, the cutting action involves moving the threading tube 804 horizontally. During this horizontal movement, since the end face of the threading tube 804 is flush with the surface of the subsequent clamping mold, the end face of the threading tube 804 generates a shearing force, which cuts the wire 9, thus achieving the cutting of the wire 9. Therefore, the wire 9 can be cut simply by the threading tube 804 being pushed and moved.

[0044] The second reset member 805 is disposed at the end of the guide block 803 away from the third drive cam 4, and is used to push the end of the guide block 803 against the third drive cam 4. Specifically, the second reset member 805 can be implemented by a spring and can be installed in a fixing block for fixing, so as to ensure that the spring pushes the guide block 803 against the third drive cam 4 at all times.

[0045] In this embodiment, the propulsion device 7 is an eccentric reciprocating propulsion device 7, which includes: a drive shaft 701, a limiting frame 702, a slider 704, a limiting member 705, a driven shaft 706, and a linkage mechanism 707.

[0046] The limiting frame 702 is fastened to the drive shaft 701. A groove 703 is provided on the side of the limiting frame 702 away from the drive shaft 701. The limiting frame 702 is a rectangular block with the groove 703 carved out. The bottom of the groove 703 has a certain thickness. The drive shaft 701 is connected to the bottom of the limiting frame 702 and tightened. The drive shaft 701 is rotated and fixed by multiple bearing seats 710. The end of the drive shaft 701 away from the limiting frame 702 is used to connect a drive motor or the like to provide driving force. The length direction of the groove 703 is orthogonal to the axis direction of the drive shaft 701, so that the rotation of the drive shaft 701 can drive the entire limiting frame 702 to rotate. There is a rotation center in the groove 703 that remains stationary.

[0047] The slider 704 is slidably disposed in the groove 703. The width of the slider 704 is consistent with the width of the groove 703, and the length of the slider 704 is less than the length of the groove 703. The slider 704 is used to reciprocate along the length direction of the groove 703. One end of the driven shaft 706 is fixedly connected to the slider 704, and the shaft core of the driven shaft 706 is parallel to the shaft core of the drive shaft 701. The other end of the driven shaft 706 is connected to the linkage mechanism 707. During the rotation of the limit frame 702, it is used to drive the linkage mechanism 707 to reciprocate.

[0048] Specifically, it is also connected to the limiting frame 702 by a limiting member 705 to limit the position of the slider 704 in the limiting frame 702; One end of the linkage mechanism 707 is rotatably connected to the other end of the driven shaft 706, and the other end of the linkage mechanism 707 serves as the working end.

[0049] By fixing the limiting frame 702 to the drive shaft 701, the slider 704 can slide in the slide groove 703, and the driven shaft 706 is connected to the slider 704, thereby adjusting the eccentric distance between the drive shaft 701 and the driven shaft 706. Then, the slider 704 is fixed by the limiting member 705, thereby making it convenient and quick to adjust the eccentric distance of the entire propulsion device 7, and thus quickly adjusting the range of propulsion distance.

[0050] Specifically, two limiting members 705 are provided, and the two limiting members 705 are respectively provided at both ends of the slide groove 703. The ends of the limiting members 705 abut against both ends of the slider 704 to limit the position of the slider 704 in the slide groove 703. The limiting members 705 can be implemented by bolts, etc. The bolts are screwed into the limiting frame 702, and the ends of the bolts abut against the slider 704 to ensure the stability of the slider 704 in the slide groove 703. There are two bolts provided and they are located at both ends of the slide groove 703, which can prevent the slider 704 from moving to both ends, thereby maintaining stability.

[0051] It also includes a pad 708, which is disposed between the limiting member 705 and the slider 704. The pad 708 increases the contact area and reduces the length of the limiting member 705 extending into the slide groove 703, thereby preventing the limiting member 705 from shaking and ensuring stability.

[0052] The drive shaft 701 is fastened to the center of the slide groove 703 in the limiting frame 702, so that the slider 704 can be adjusted to either end of the slide groove 703.

[0053] To ensure the precise adjustment of the slider 704, the limiting frame 702 has graduations spaced along the length of the slide groove 703 on the side near the slide groove 703. The graduations indicate the distance of the slider 704 from its original center position, that is, the distance of deviation between the driven shaft 706 and the drive shaft 701 after adjustment.

[0054] In this embodiment, a sliding mechanism 709 is also included, which includes a slide block 7091 and a slide table 7092.

[0055] A limiting groove 7093 is formed on the upper edge of the slide block 7091 orthogonal to the axis of the driven shaft 706. The slide table 7092 is slidably connected to the slide block 7091. The slide table 7092 is provided with a limiting protrusion 7094 that matches the limiting groove 7093. The limiting protrusion 7094 and the limiting groove 7093 can ensure that the slide table 7092 slides on the slide block 7091 along the length direction of the limiting groove 7093. The working end of the linkage mechanism 707 is rotatably connected to the slide table 7092. The linkage mechanism 707 drives the slide table 7092 to reciprocate. The slide table 7092 makes it easier to arrange subsequent parts.

[0056] The slide block 7091 has an oblong hole 7095509 orthogonal to the axis of the driven shaft 706, that is, the long axis of the oblong hole is consistent with the reciprocating motion direction of the slide table 7092. The slide table 7092 is provided with a boss 7096 passing through the oblong hole 7095509. The working end of the linkage mechanism 707 is rotatably connected to the boss 7096, so that the setting of the boss 7096 does not affect the upper surface of the slide table 7092.

[0057] In this embodiment, the linkage mechanism 707 includes a connecting block 511 and a rod.

[0058] A bearing is provided in the connecting block 511, and the bearing is connected to the driven shaft 706. The connecting block 511 is mainly used to install the bearing, so as to facilitate the rotatable connection between the driven shaft 706 and the rod. The rod is arranged in a direction perpendicular to the axis of the driven shaft 706. One end of the rod is screwed to the connecting block 511, and the other end is rotatably connected to the slide table 7092.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lead feeding and cutting mechanism for semiconductor devices, characterized in that, include: A drive roller is arranged parallel to the wire conveying direction, and a first drive cam, a second drive cam, and a third drive cam are spaced apart on the drive roller; The clamping assembly includes a first clamping unit and a second clamping unit spaced apart along the wire conveying direction. The first clamping unit and the second clamping unit respectively abut against the first drive cam and the second drive cam for alternately opening and closing the wire. A propulsion device is located upstream of the clamping assembly, and its working end is connected to the first clamping unit, which is used to drive the first clamping unit to move closer to or away from the second clamping unit. A cutting unit is disposed downstream of the clamping assembly. The cutting unit abuts against the third drive cam and is used to cut the wire when the second clamping unit clamps the wire.

2. The cutting tool according to claim 1, wherein The first clamping unit has the same structure as the second clamping unit, wherein the first clamping unit includes: A clamping base, wherein a first die head and a second die head for clamping wires are slidably disposed; The first lever is rotatably connected to the clamping seat, and the first end of the first lever abuts against the first mold head or the second mold head to push the two mold heads to stick together or separate. The second lever has its first end abutting against the second end of the first lever, and its second end abutting against the first drive cam.

3. The cutting and feeding mechanism according to claim 2, characterized in that, It also includes a first reset member, which is disposed on the side of the second end of the first lever that is different from the second lever, and is used to push the second end of the first lever toward the direction of the second lever.

4. The cutting and feeding mechanism according to claim 2, characterized in that, An extension plate is provided at the second end of the first lever along the wire conveying direction; The first end of the second lever is rotatably provided with a wheel, the rotation axis of the wheel is perpendicular to the direction of the wire, and the circumferential surface of the wheel abuts against the surface of the extension plate.

5. The cutting tool according to claim 4, wherein The second lever has a waist-shaped hole at its first end, the length of which points to the second end of the first lever. A connecting bolt passes through the waist-shaped hole, and a connecting block is connected to the end of the connecting bolt. The rotating wheel is rotatably connected to the connecting block.

6. The cutting tool according to claim 5, wherein A limit strip is provided on the first end of the second lever on the side of the connecting block away from the first lever. An adjusting bolt is screwed onto the limit strip, and the end of the adjusting bolt abuts against the surface of the connecting block on the side away from the first lever.

7. The cutting and feeding mechanism according to claim 1, characterized in that, The cutting unit includes: A guide member, wherein a guide groove is provided in the guide member perpendicular to the direction of the wire; A guide block is slidably disposed in the guide groove, and one end of the guide block abuts against the third drive cam. A conduit is disposed in the guide block at one end away from the third drive cam, and the conduit is on the same straight line as the wire in the clamping unit. The second reset member is disposed at the end of the guide block away from the third drive cam, and is used to push the end of the guide block against the third drive cam.

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