Automatic glove strapping machine

Abstract

The invention discloses an automatic glove bundling machine, which relates to the technical field of glove machines and solves the problem of automatically bundling rubber bands for stacked gloves. The machine comprises a rubber band receiving and bundling device, a rubber band placing device and a glove pushing device. The rubber band receiving and bundling device mainly comprises a vertically arranged slide seat with a through hole and a plurality of hook wire assemblies with hook heads. The slide seat is provided with a slide groove which is distributed in a divergent shape with the through hole as the center. The hook wire assembly is driven to slide back and forth in the slide groove. The hook head is located in the hook wire assembly facing one end of the through hole. A rubber band groove and a radial through groove are respectively provided on the circumference and radial direction of a rubber band drum, so that the rubber band placing device cooperates with the hook wire assembly to hook the rubber band. A rubber band releasing strip is provided in the hook wire assembly, so that the rubber band is released after the glove stack enters the rubber band drawn into a square shape. The labor force can be reduced and the automation degree of bundling the glove stack can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of glove machines, in particular to an automatic glove bundling machine. Background Art

[0002] Ordinary glove knitting machines generally have the technical problem of low efficiency in finishing the knitted gloves. A Chinese patent with authorization announcement number CN208362618U discloses a glove knitting machine and a finished product storage device thereof, including a housing of the glove knitting machine and a discharge port on the housing, and also includes a storage basket located at the discharge port, a slot is provided on the housing, a hook is connected to the storage basket, and the end of the hook away from the storage basket is clamped in the slot.

[0003] Although the above patent sets a storage basket at the discharge port of the glove knitting machine, the knitted gloves are in a disorderly manner when entering the storage basket, and they still need to be manually sorted into stacks one by one when collecting the gloves, and then they need to be manually tied with rubber bands. This is time-consuming and labor-intensive, increasing labor and production costs. The industry urgently needs an automated equipment that can automatically tie stacks of gloves with rubber bands.

[0004] Based on this, this application is filed. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide an automatic glove bundling machine so as to automatically bundle the gloves, reduce labor and improve the degree of automation of bundling gloves.

[0006] To achieve the above object, the present invention proposes an automatic glove strapping machine, comprising:

[0007] The elastic band connecting and bundling device mainly consists of a vertically arranged slide seat with a through hole and a plurality of hook wire components with hook heads. The slide seat is provided with a slide groove distributed in a divergent shape with the through hole as the center. The hook wire component is driven to slide back and forth in the slide groove. The hook head is located in the hook wire component toward one end of the through hole.

[0008] The rubber band placing device comprises a rubber band roller with a front end for rubber band sleeve, the rubber band roller is provided with radial through grooves, the direction and number of the radial through grooves correspond to the hook wire assembly and are for hook heads to extend into, and the rubber band roller is driven to be telescopically arranged in the through hole of the slide seat;

[0009] And a push plate device, which comprises a push plate which is arranged to move toward the through hole of the slide seat.

[0010] Preferably, the rubber band connecting and bundling device also includes a sliding pin, a slider combination, and a driven rotating disk. The driving rotating disk is arranged outside the rubber band drum and is provided with a rotationally symmetrical and spiral array curved driving track. The hook wire assembly is fixedly connected to the slider of the slider combination after passing through the sliding groove of the sliding seat. One end of the sliding pin is fixedly connected to the slider of the slider combination, and the other end of the sliding pin is flexibly matched with the curved driving track of the driving rotating disk.

[0011] Preferably, the hook line assembly includes a hook line with the hook head at the front end and an elastic release strip with a release portion at the front end. The elastic release strip is swingably set on the hook line and is pressed by a spring pressure sheet so that the release portion and the hook head are overlapped. Swinging the elastic release strip can cause the release portion to be misaligned with the hook head. A pushing tail portion is provided at the other end of the elastic release strip, and a collision block for triggering the pushing tail portion to swing the elastic release strip is provided on the side of the slide groove of the slide seat.

[0012] Preferably, the hook line is arranged on the slot of the connecting block, the connecting block is slidably installed in the slide groove of the slide seat, the elastic release strip is relatively swingably arranged with the hook line through the axial screw, and the spring pressing piece is fixed on the connecting block, and its front end is pressed on the hook line and the elastic release strip.

[0013] Preferably, the front end of the rubber drum is provided with a plurality of rubber grooves which are circumferentially distributed and for the rubber to be sleeved, and the rubber grooves are connected with the radial through grooves.

[0014] Preferably, a turntable tooth portion is provided on the circumference of the driving turntable, a motor 1 is fixed on the slide seat, a driving shaft of the motor 1 is connected to a gear 1, and the gear 1 is meshed with the turntable tooth portion.

[0015] Preferably, the end of the rubber band roller is arranged on a roller base, and the roller base is arranged on a nut of an electric screw slide, and the electric screw slide drives the rubber band roller to slide and retract in the through hole of the slide seat.

[0016] Preferably, the push plate is located in front of the through hole of the slide and is arranged parallel to the slide. A rack is provided on the push plate, and the rack is meshed with gear 2 driven by motor 2. Motor 2 is arranged on a frame vertically connected to the slide.

[0017] Preferably, the axial screw is divided into axial screw one and axial screw two. The axial screw one is combined with the slot of the connecting block after passing through the axial hole of the elastic release strip and the hook line, and the axial screw two is combined with the hook line after passing through the through slot of the elastic release strip. The elastic release strip can make a swinging motion relative to the hook line within the range of the through slot with the axial screw one as the center.

[0018] Beneficial effects of the present invention:

[0019] 1. Elastic grooves and radial through grooves are respectively provided on the circumference and radial direction of the elastic drum, so that the elastic releasing device cooperates with the hook wire assembly to hook the elastic. An elastic releasing strip is provided in the hook wire assembly, so that the elastic is released after the glove is folded into the elastic stretched into a square shape;

[0020] 2. The sliding pin, the slider of the slider combination and the hook wire assembly are driven by the curved driving track provided on the driving turntable to move along the slide groove provided on the slide seat, and cooperate with the rubber band roller and the glove pushing device to expand the rubber band and tie the gloves;

[0021] 3. It can reduce labor and improve the automation level of bundling gloves.

[0022] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional assembly diagram of the present invention;

[0024] Figure 2 An exploded view of the rubber band and tying device;

[0025] Figure 3 A three-dimensional assembly diagram of the elastic band connection and tying device;

[0026] Figure 4 An exploded view of the hook-wire assembly;

[0027] Figure 5 A three-dimensional assembly diagram of the hook and line assembly;

[0028] Figure 6 An exploded view of the rubber band device;

[0029] Figure 7 A three-dimensional assembly diagram of the rubber band placing device;

[0030] Figure 8 An exploded view of the push glove device;

[0031] Fig. 9 A three-dimensional assembly diagram of the push glove device;

[0032] Fig.10 A schematic diagram of the working process of the present invention when connecting rubber bands;

[0033] Fig.11 A working schematic diagram of the present invention when the rubber band is expanded;

[0034] Fig.12 A schematic diagram of the working process of bundling gloves of the present invention;

[0035] Fig.13 A schematic diagram of the operation of the hook-line assembly when releasing the rubber band;

[0036] Fig.14 A working diagram of the gloves being stacked and returned after being bundled;

[0037] In the figure:

[0038] 1. Elastic band receiving and tying device; 11. Driving turntable; 11a. First curved driving track; 11b. Second curved driving track; 11c. Third curved driving track; 11d. Fourth curved driving track; 11e. Turntable tooth portion; 12. Gear 1; 13. First sliding pin; 14. First slider combination; 15. Second sliding pin; 16. Second slider combination; 17. Third sliding pin; 18. Third slider combination; 19. Fourth sliding pin; 110. Fourth Slider assembly; 111, motor base plate; 112, slide seat; 112a, first slide slot; 112b, second slide slot; 112c, third slide slot; 112d, fourth slide slot; 112e, notch; 113, motor 1; 114, lower right hook assembly; 115, lower left hook assembly; 116, upper right hook assembly; 117, upper left hook assembly; 118, first bumper; 119, second bumper; 120, third bumper; 121, fourth bumper;

[0039] 2. Rubber band placing device; 21. Rubber band roller; 21a. Radial through groove; 21b. Axial inner hole; 21c. Rubber band groove; 22. Roller cover; 23. Roller base; 24. Electric screw slide;

[0040] 3. Push glove device; 31. Frame; 32. Gear 2; 33. Rack; 34. Upper sliding shaft; 35. Lower sliding shaft; 36. Push plate; 37. Sliding block; 38. Motor 2;

[0041] 40, connecting block; 40a, slot; 41, hook line; 41a, hook head; 42, spring pressure piece; 43, rubber band release strip; 43a, shaft hole; 43b, push tail; 43c, through slot; 43d, release part; 44, shaft screw 1; 45, shaft screw 2;

[0042] 5. Conveying device;

[0043] 6. Fold the gloves;

[0044] 7. Rubber band. DETAILED DESCRIPTION

[0045] See also Figures 1 to 14 This embodiment is used to be installed on a glove machine frame corresponding to a conveying device 5 for receiving a glove stack 6, and includes an elastic band receiving and bundling device 1, an elastic band placing device 2, and a glove pushing device 3;

[0046] The elastic band receiving and tying device 1 is mainly composed of a vertically arranged slide 112 with a through hole and at least four hook wire components with hook heads 41a. In this embodiment, there are four hook wire components, which are divided into a right lower hook wire component 114, a left lower hook wire component 115, a right upper hook wire component 116 and a left upper hook wire component 117 according to the position of the setting. The slide 112 is provided with a first slide groove 112a, a second slide groove 112b, a third slide groove 112c and a fourth slide groove 112d which are distributed in a divergent shape with the through hole as the center. The right upper hook wire component 116, the upper left hook wire assembly 117, the lower right hook wire assembly 114 and the lower left hook wire assembly 115 are respectively driven to slide back and forth in the first slide groove 112a, the second slide groove 112b, the third slide groove 112c and the fourth slide groove 112d, and the hook head 41a is located at one end of the hook wire assembly facing the through hole; in terms of the driving method of the hook wire assembly, it can adopt independent cylinders, motor push rods, etc. to control it to slide along the corresponding slide grooves respectively. In the present embodiment, each hook wire assembly is driven by a driving turntable 11.

[0047] The rubber band placing device 2 includes a rubber band roller 21 at the front end for the rubber band 7 to be sleeved, and a radial through groove 21a is provided on the rubber band roller 21. The radial through grooves 21a are distributed along the length direction of the rubber band roller 21, and the number is four. The radial through grooves 21a are respectively arranged corresponding to the lower right hook wire assembly 114, the lower left hook wire assembly 115, the upper right hook wire assembly 116 and the upper left hook wire assembly 117 for the hook head 41a to extend and hook the rubber band 7. The rubber band roller 21 is linearly driven and telescopically arranged in the through hole of the slide seat 112;

[0048] The glove pushing device 3 includes a push plate 36 that is moved toward the through hole of the slide seat 112. The push plate 36 can move in a straight line toward the through hole. The drive mode of the rubber drum 21 and the push plate 36 can be any one of the existing linear drive structures such as a cylinder, a motor with a screw nut, a motor with a crankshaft connecting rod, a motor with an eccentric connecting rod, an electric push rod, a motor with a gear rack, etc. When each hooking wire assembly moves toward each other in the corresponding slide groove, each hook head 41a is closed and enters under the rubber band 7 through the radial through groove 21a to hook the rubber band 7 set in the rubber band placing device 2. When each hooking wire assembly moves in a reverse direction in the corresponding slide groove, the hook head 41a stretches the rubber band 7, and the glove pushing device 3 pushes the cuff of the glove stack 6 into the rubber band 7 pulled into a square shape. The rubber band receiving and bundling device 1 releases the rubber band 7 for bundling, and the rubber band placing device 2 pushes the bundled glove stack 6 back to the initial position.

[0049] Specifically, the rubber band connecting and bundling device 1 also includes a sliding pin, a slider combination and a driving turntable 11 driven by the motor 113 to rotate, the sliding pin includes a first sliding pin 13, a second sliding pin 15, a third sliding pin 17 and a fourth sliding pin 19, the slider combination includes a first slider combination 14, a second slider combination 16, a third slider combination 18 and a fourth slider combination 110, the driving turntable 11 is sleeved outside the rubber band drum 21 and is provided with a rotationally symmetrical and spiral array curved driving track. In this embodiment, the curved driving track includes a first curved driving track 11a, a second curved driving track 11b, a third curved driving track 11c and a fourth curved driving track 11d, the first slider combination 14, the second slider combination 16, the third slider combination 18, and the fourth slider combination 110 are arranged on the slide seat 112, and are respectively connected to the first slide groove 112a, the second slide groove 112a and the second slide groove 112b of the slide seat 112. The first sliding pin 13, the second sliding pin 15, the third sliding pin 17 and the fourth sliding pin 19 are respectively fixed to the sliders of the first slider combination 14, the second slider combination 16, the third slider combination 18 and the fourth slider combination 110 at one end, and the other end is respectively flexibly matched with the first curved driving track 11a, the second curved driving track 11b, the third curved driving track 11c and the fourth curved driving track 11d of the driving turntable 11. The upper right hooking assembly 116, the upper left hooking assembly 117, the lower right hooking assembly 114 and the lower left hooking assembly 115 are respectively fixed to the sliders of the first slider combination 14, the second slider combination 16, the third slider combination 18 and the fourth slider combination 110 through the first sliding slot 112a, the second sliding slot 112b, the third sliding slot 112c and the fourth sliding slot 112d of the sliding seat 112.

[0050] Specifically, the hook line assembly includes a hook line 41 with a hook head 41a at the front end and an elastic release strip 43 with a release portion 43d at the front end. The elastic release strip 43 is swingably arranged on the hook line 41 and is pressed by a spring pressure sheet 42 so that the release portion 43d overlaps with the hook head 41a. Swinging the elastic release strip 43 can cause the release portion 43d to be misaligned with the hook head 41a. The other end of the elastic release strip 43 is provided with a pushing tail 43b A collision block is provided on the side of the slide groove of the slide seat 112 to trigger the pushing tail 43b to swing the rubber release strip 43. The pushing tail 43b of the rubber release strip 43 is arranged corresponding to the collision block. The collision block includes a first collision block 118, a second collision block 119, a third collision block 120 and a fourth collision block 121, which are respectively arranged on the sliding sides of the first slide groove 112a, the second slide groove 112b, the third slide groove 112c and the fourth slide groove 112d of the slide seat 112. When the release portion 43d and the hook head 41a are overlapped, the release portion 43d cooperates with the hook head 41a to complete the hooking and stretching of the elastic band 7. When the hook wire assembly slides in the slide groove so that the pushing tail 43b hits the collision block, the release portion 43d will overcome the force of the spring pressure piece 42 and swing, causing it to be misaligned with the hook head 41a, thereby moving the elastic band 7 so that the hook wire assembly releases the elastic band 7 to the cuff of the glove stack 6 to achieve bundling.

[0051] Specifically, the hook line assembly also includes a connecting block 40, a hook line 41 is arranged on the slot 40a of the connecting block 40, the connecting block 40 is connected to the slider of each slider assembly and is slidably installed in the slide groove of the slide seat 112, the elastic release strip 43 is relatively swingably arranged with the hook line 41 through the axial screw, and the spring pressure piece 42 is fixed on the connecting block 40, and its front end is pressed on the hook line 41 and the elastic release strip 43. Among them, the axial screw is divided into an axial screw 1 44 and an axial screw 2 45. The axial screw 1 44 is combined with the slot 40a of the connecting block 40 after passing through the axial hole 43a of the elastic release strip 43 and the hook line 41. The axial screw 2 45 is combined with the hook line 41 after passing through the through slot 43c of the elastic release strip 43. The elastic release strip 43 can make a swinging motion relative to the hook line 41 within the range of the through slot 43c with the axial screw 1 44 as the center, and the through slot 43c is used to limit the swinging amplitude of the release part 43d.

[0052] In this embodiment, the front end of the rubber drum 21 is provided with circumferentially distributed rubber grooves 21 c and an axial inner hole 21 b for rubber sleeves, the radial through grooves 21 a are connected with the rubber grooves 21 c and the axial inner hole 21 b, and the drum cover 22 is arranged at the front end of the rubber drum 21 .

[0053] The specific driving structure of the driving turntable 11 is as follows: the motor base plate 111 is combined with the notch 112e of the slide 112, the driving shaft of the motor 113 is combined with the gear 12 after passing through the notch 112e of the slide 112 and the motor base plate 111, and the gear 12 is meshed with the turntable tooth portion 11e opened on the circumference of the driving turntable 11.

[0054] Specifically, the rubber drum 21 is driven by an electric screw slide 24 , the rubber drum 21 is combined with a drum base 23 , the drum cover 22 is arranged at the front end of the rubber drum 21 , and the drum base 23 is arranged on the nut of the electric screw slide 24 .

[0055] In this embodiment, the push glove device 3 includes a frame 31, a second gear 32, a rack 33, a sliding block 37 and the push plate 36. The driving shaft of the second motor 38 is combined with the second gear 32 through the frame 31. The upper sliding shaft 34 and the lower sliding shaft 35 are flexibly matched with the sliding hole of the sliding block 37 after being opened in the axial hole of the frame 31. The rack 33 is fixedly connected to the rear side of the sliding block 37, the second gear 32 is meshed with the rack 33, and the push plate 36 is fixedly arranged on the front side of the sliding block 37.

[0056] The working principle of this embodiment is as follows: Fig.10 As shown, first, the rubber band placing device 2 drives the rubber band roller 21 to return to the zero position, and then the rubber band placing device 2 drives the rubber band roller 21 to the rubber band placing position, and then the rubber band and bundling device 1 drives the driving turntable 11 to rotate, and the curved driving track of the driving turntable 11 drives the upper right hook wire assembly 116, the upper left hook wire assembly 117, the lower right hook wire assembly 114, and the lower left hook wire assembly 115 to move toward the rubber band 7 sleeved on the rubber band groove of the rubber band roller 21 along the first slide groove 112a, the second slide groove 112b, the third slide groove 112c, and the fourth slide groove 112d of the slide seat 112, until the rubber band 7 can be hooked from four directions, and at the same time, the glove stack 6 has been conveyed to the position corresponding to the rubber band roller 21 through the conveying device 5; then, as Fig.11 As shown, the elastic band receiving and bundling device 1 drives the driving turntable 11 to rotate, and also drives the upper right hook wire assembly 116, the upper left hook wire assembly 117, the lower right hook wire assembly (not shown), and the lower left hook wire assembly (not shown) to pull the elastic band 7 into a square shape until it can at least accommodate the cuff of the glove stack 6. Subsequently, the push plate 36, driven by the glove pushing device 3, pushes the cuff of the glove stack 6 disposed on the conveying device 5 into the elastic band 7 pulled into the square shape; Fig.12As shown, the rubber band receiving and bundling device drives the driving turntable 11 to rotate, and the curved driving track of the driving turntable 11 drives the upper right hook wire assembly 116, the upper left hook wire assembly 117, the lower right hook wire assembly (not shown), and the lower left hook wire assembly (not shown) to move along the first slide groove 112a, the second slide groove 112b, the third slide groove (not shown), and the fourth slide groove (not shown) of the slide seat 112 to the first collision block 118, the second collision block 119, the third collision block (not shown), and the fourth collision block (not shown) until the pushing tails of each rubber band release block collide with the corresponding collision block respectively, and then, as shown in FIG. Fig.13 As shown, due to the collision of the pushing tail 43b of the elastic releasing block 43 and the collision block, the elastic releasing block 43 rotates around the axial screw 1 44 and the axial screw 2 45, and the spring pressing piece 42 is deformed, and then the releasing part 43d of the elastic releasing block 43 drives the elastic 7 to break away from the hook head 41a of the hook line 41, and releases the elastic 7 to the cuff of the glove fold for bundling. When the pushing tail 43b of the elastic releasing block 43 does not collide with the collision block, the elastic releasing block 43 returns to its original position under the action of the spring pressing piece 42; Fig.14 As shown, the glove pushing device 3 drives the push plate 36 to retreat to the initial position, and then the electric screw slide 24 drives the roller base 23 to move, and also drives the elastic roller 21 and the roller cover 22 to push the cuff tail of the glove stack 6 until the bundled glove stack 6 returns to the initial position, and then the bundled glove stack 6 is taken down from the conveying device 5, and then the conveying device 5 conveys another glove stack to the position corresponding to the elastic roller, and then repeats the above action.

[0057] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. An automatic glove strapping machine, characterized in that: include: The elastic band connecting and bundling device (1) mainly comprises a vertically arranged slide seat (112) with a through hole and a plurality of hook wire components with hook heads (41a), wherein the slide seat (112) is provided with a slide groove distributed in a divergent shape with the through hole as the center, the hook wire component is driven to slide back and forth in the slide groove, and the hook head (41a) is located in the hook wire component at one end facing the through hole; The rubber band placing device (2) comprises a rubber band roller (21) at the front end for placing the rubber band, the rubber band roller (21) is provided with radial through grooves (21a), the direction and number of the radial through grooves (21a) correspond to the hook wire assembly and are for the hook head (41a) to extend into, and the rubber band roller (21) is driven to be telescopically arranged in the through hole of the slide seat (112); And a pusher glove device (3), which comprises a pusher plate (36) which is arranged to move toward the through hole of the slide seat (112).

2. The automatic glove strapping machine according to claim 1, characterized in that: The rubber band connecting and bundling device (1) also includes a sliding pin, a slider combination, and a driven rotating disk (11) that is rotated. The driving rotating disk (11) is sleeved outside the rubber band drum (21) and is provided with a rotationally symmetrical and spiral array curved driving track. The hook wire assembly is fixedly connected to the slider of the slider combination after passing through the sliding groove of the sliding seat (112). One end of the sliding pin is fixedly connected to the slider of the slider combination, and the other end of the sliding pin is flexibly matched with the curved driving track of the driving rotating disk (11).

3. The automatic glove strapping machine according to claim 1, characterized in that: The hook line assembly comprises a hook line (41) with a hook head (41a) at the front end and an elastic release strip (43) with a release portion (43d) at the front end. The elastic release strip (43) is swingably arranged on the hook line (41) and is pressed by a spring pressure sheet (42) so that the release portion (43d) and the hook head (41a) are overlapped and distributed. Swinging the elastic release strip (43) can cause the release portion (43d) and the hook head (41a) to be misaligned. The other end of the elastic release strip (43) is provided with a pushing tail (43b). The side of the slide groove of the slide seat (112) is provided with a collision block for triggering the pushing tail (43b) to swing the elastic release strip (43).

4. The automatic glove strapping machine according to claim 3, characterized in that: The hook line (41) is arranged on the slot (40a) of the connecting block (40), and the connecting block (40) is slidably installed in the slot of the slide seat (112). The elastic release strip (43) is relatively swingably arranged with the hook line (41) via an axial screw. The spring pressing piece (42) is fixed on the connecting block (40), and its front end is elastically pressed on the hook line (41) and the elastic release strip (43).

5. The automatic glove strapping machine according to claim 1, characterized in that: The front end of the rubber drum (21) is provided with a plurality of rubber grooves (21c) distributed circumferentially for rubber bands to be sleeved, and the rubber grooves (21c) are connected to the radial through grooves (21a).

6. The automatic glove strapping machine according to claim 2, characterized in that: The circumference of the driving turntable (11) is provided with a turntable tooth portion (11e), the slide seat (112) is fixedly provided with a motor (113), the driving shaft of the motor (113) is connected to a gear (12), and the gear (12) is meshed with the turntable tooth portion (11e).

7. The automatic glove strapping machine according to any one of claims 1 to 5, characterized in that: The end of the rubber roller (21) is arranged on a roller base (23), and the roller base (23) is arranged on a nut of an electric screw slide (24). The electric screw slide (24) drives the rubber roller (21) to slide and retract in the through hole of the slide seat (112).

8. The automatic glove strapping machine according to claim 7, characterized in that: The push plate (36) is located in front of the through hole of the slide (112) and is arranged parallel to the slide (112). A rack (33) is provided on the push plate (36). The rack (33) is meshed with a gear (32) driven by a motor (38). The motor (38) is arranged on a frame (31) vertically connected to the slide (112).

9. The automatic glove strapping machine according to claim 4, characterized in that: The axial screw is divided into an axial screw 1 (44) and an axial screw 2 (45). The axial screw 1 (44) is connected to the slot (40a) of the connecting block (40) through the axial hole (43a) of the elastic release strip (43) and the hook line (41). The axial screw 2 (45) is connected to the hook line (41) through the through slot (43c) of the elastic release strip (43). The elastic release strip (43) can swing relative to the hook line (41) within the range of the through slot (43c) with the axial screw 1 (44) as the center.

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