Bottom thread drawing device

Abstract

The utility model discloses a bottom thread pulling device which comprises a movable seat, a clamping mechanism, an elastic piece, a movable clamping hook, a driving mechanism and a blocking piece, the movable seat and the clamping mechanism can move synchronously, the elastic piece is used for enabling the clamping mechanism to be in a closed state, and the movable clamping hook can move back and forth between a fixed seat and the clamping mechanism. The driving mechanism drives the movable clamping hook to move so as to make contact with the clamping mechanism, the driving mechanism can drive the movable base and the clamping mechanism to move synchronously, the blocking piece can make contact with the clamping mechanism when the movable base moves, the clamping mechanism is converted into the open state, and meanwhile the blocking piece can make contact with the clamping mechanism when the movable base moves. The movable clamping hook moves through the driving mechanism to be clamped and hooked on the clamped and hooked part of the clamping mechanism, so that the clamping mechanism is kept in an open state, and in the return stroke, the driving mechanism drives the movable clamping hook to be separated from the clamped and hooked part, so that the clamping mechanism returns to a closed state through the elastic piece. And the single driving mechanism can effectively control the movement and the opening and closing state change of the clamping mechanism.

Description

Technical Field

[0001] This utility model relates to a bobbin thread pulling device used in the sewing machine field. The bobbin thread pulling device can pull out a bobbin thread of a preset length from the bobbin case, so that a longer bobbin thread can be reserved on the outside of the bobbin case to serve as the thread end for the next sewing. In particular, it relates to a bobbin thread pulling device that can effectively control the movement and opening and closing state changes of the clamping mechanism using a single drive mechanism. Background Technology

[0002] Sewing machines primarily combine multiple layers of fabric by stitching together. With continuous technological advancements, there are now various types of sewing machines on the market, each suitable for different fabric types. Among them, there is currently an inner thread sewing machine available that can be used to sew the upper and sole of shoes.

[0003] The operation of existing sewing machines mainly relies on a rocker arm that can swing back and forth to perform sewing operations. When existing sewing machines sew on shoes, the shoes are fitted with a shuttle at the end of the rocker arm. As the rocker arm swings back and forth, the main shaft drives the needle through the shoes, allowing the needle thread to interweave with the bottom thread, thus forming a sewing stitch around the shoes.

[0004] However, after completing the sewing operation, some existing internal thread sewing machines can automatically perform a thread cutting operation, allowing the movable cutter of the existing internal thread sewing machine to cut the needle thread installed on the needle and the bobbin thread installed on the bobbin case. However, after the existing internal thread sewing machine completes the thread cutting operation, a certain length of bobbin thread will be left outside the bobbin case. The length of the bobbin thread left outside the bobbin case will directly affect the length of the thread end generated when the internal thread sewing machine starts sewing next time. If the operator wants to leave a longer length of bobbin thread outside the bobbin case for subsequent knotting processes, the operator usually needs to manually pull the bobbin thread out of the bobbin case. However, the operator's frequent manual pulling of the bobbin thread is not only easy to feel fatigued, but may also cause damage to the skin of the fingers. Utility Model Content

[0005] The main objective of this invention is to provide a bobbin thread pulling device that solves the inconvenience of operators having to manually pull out the bobbin thread. After the inner threading machine cuts the needle thread and the bobbin thread, the bobbin thread pulling device can automatically pull out the bobbin thread from the bobbin case, so that a longer bobbin thread can be reserved on the outside of the bobbin case. This not only helps the inner threading machine to produce a sufficiently long thread end on the surface of the shoe when it starts sewing again, but also significantly improves the convenience for operators to perform subsequent knotting processes.

[0006] The secondary objective of this utility model is to provide an improved structural form of the bottom-pulling device, which allows the clamping mechanism to flexibly switch between a closed or open state during the movement of the improved bottom-pulling device when the driving mechanism drives the clamping mechanism to move. Thus, the improved bottom-pulling device only needs a single driving source to achieve the switching between the open and closed states of the moving clamping mechanism and the clamping mechanism, thereby effectively reducing the cost of electrical control.

[0007] Another objective of this invention is to provide a pull-line device that can adjust the resistance of the moving seat relative to the fixed seat, so that the movable hook does not move synchronously with the moving seat in the initial stage when driven by the drive mechanism. Instead, the movable hook can move relative to the moving seat to selectively approach or move away from the hook part of the movable clamp, effectively ensuring that the movable hook can reliably engage or disengage from the hook part of the movable clamp. Even when the moving seat is driven by the drive mechanism with the movable hook in contact with the hook part, increasing the resistance of the moving seat relative to the fixed seat can prevent the weight of the moving seat from causing the movable hook of the moving seat to disengage from the hook part, thereby ensuring the stability of the moving seat.

[0008] Another objective of this utility model is to provide a bottom-pulling device that can reduce the noise emitted when the drive mechanism operates to its limit position, thereby reducing the noise generated during the operation of the bottom-pulling device.

[0009] Another objective of this utility model is to provide a clamping mechanism with an improved structural design. When the moving seat moves the clamping mechanism close to the shuttle shell, the clamping mechanism can effectively make the bottom line fall into the range of the clamping mechanism, thereby improving the success rate of the clamping mechanism in clamping the bottom line.

[0010] To achieve the aforementioned objectives, this utility model provides a bottom-pulling device, which is used in conjunction with an inner thread machine and includes: a movable clamp, a clamping mechanism, an elastic element, a blocking element, a movable hook, and a driving mechanism.

[0011] The movable clamp has a fixed base connected to the internal communication unit and a movable base that can move relative to the fixed base. The movable base has a fixed base connecting part movably connected to the fixed base and a clamp connecting part extending from the fixed base connecting part. The clamping mechanism has a fixed clamp fixed to the clamp connecting part and a movable clamp movably connected to the movable base. The fixed clamp and the movable clamp can move synchronously with the movable base, such that the range through which the movable clamp moves is defined as a clamp moving area. The movable clamp has a hook part spaced apart from the fixed base connecting part and a clamping part that can contact the fixed clamp.

[0012] The elastic element acts on the movable clamp, allowing the clamping part to approach the fixed clamp, thereby enabling the clamping part and the fixed clamp to be in a closed state. The blocking element is positioned in the clamp's moving area, allowing the blocking element to contact the movable clamp when the moving seat moves, while the clamping part moves away from the fixed clamp, allowing the clamping part and the fixed clamp to change from the closed state to an open state.

[0013] The movable hook is disposed between the fixed base connecting part and the hooked part. The driving mechanism is used to drive the movable hook to move back and forth between the fixed base connecting part and the hooked part. When the movable hook contacts the hooked part or the fixed base connecting part, the driving mechanism can drive the movable base to move.

[0014] During the process of the clamping part and the fixed clamp changing from the closed state to the open state, the movable hook is driven by the driving mechanism to approach the hooked part, so that the movable hook can hook onto the hooked part, preventing the movable clamp from pivoting relative to the moving seat. Thus, the clamping part and the fixed clamp can remain in the open state. The driving mechanism drives the movable hook to separate from the hooked part, so that the elastic element drives the movable clamp to pivot, and the clamping part can approach the fixed clamp, allowing the clamping part and the fixed clamp to change from the open state to the closed state.

[0015] In this embodiment, the movable hook has a hook block and a hook recess adjacent to the hook block, and the hooked portion has a hook block and a hook recess adjacent to the hook block. When the clamping portion and the fixed clamp are in the closed state, the hook block will be positioned on the hooked block, so that when the movable hook approaches the movable clamp through the driving mechanism, the hook block will contact the hooked block.

[0016] When both the clamping part and the fixed clamp are in the open state, the hook block will be positioned in the hook recess, and the hooked part will be positioned in the hook recess. When the movable hook approaches the movable clamp through the driving mechanism, the hook block can be engaged inside the hook recess, and the hooked part will be engaged inside the hook recess. The hooked part has an arcuate convex surface on the side that contacts the hook block, and the hook block has an arcuate concave surface that contacts the arcuate convex surface. When the movable clamp contacts the blocking member, the movable clamp can rotate in the state where the arcuate convex surface contacts the arcuate concave surface.

[0017] Additionally, when the movable hook contacts the hooked portion, the drive mechanism can drive the clamping mechanism to a clamping position via the movable seat, so that the clamping mechanism is close to a rotary hook of the internal wiring device. The movable clamping seat also has a positioning component, which is disposed between the fixed seat and the movable seat, and is used to ensure that the moving clamping mechanism can be accurately stopped at the clamping position. The positioning component has a positioning bead and a positioning groove. The positioning bead is formed in one of the fixed seat and the movable seat, and the positioning groove is formed in the other of the fixed seat and the movable seat. A portion of the positioning bead can be inserted into the positioning groove, so that the clamping mechanism is positioned at the clamping position.

[0018] In addition, a buffer assembly is provided between the fixed seat and the movable seat. The buffer assembly can prevent the movable seat from directly hitting the fixed seat and making noise when the clamping mechanism reaches the clamping position. The buffer assembly has a buffer connected to the fixed seat, a buffer telescopic rod movably assembled to the buffer, and a buffer baffle connected to the movable seat. The buffer baffle can contact the buffer telescopic rod when the clamping mechanism moves toward the rotary hook, causing the buffer telescopic rod to retract toward the inside of the buffer. When the buffer telescopic rod stops moving relative to the buffer, the clamping mechanism is in the clamping position.

[0019] Furthermore, the line-pulling device also has a resistance mechanism disposed between the fixed seat and the movable seat, the resistance mechanism being used to adjust the moving resistance of the movable seat.

[0020] In this embodiment, the clamping mechanism further includes a hook plate that is deformable and has a hook plate connecting portion connected to the fixing clamp and a hook portion extending from the hook plate connecting portion. The hook portion bends toward the fixing clamp.

[0021] In this embodiment, the movable clamp has a movable clamping arm pivotally connected to the clamping connection portion, a swing arm pivotally connected to the fixed base connection portion, and a roller pivotally connected to one end of the swing arm. The movable clamping arm is provided with the hook portion and the clamping portion, and the swing arm is movably connected to the movable clamping arm at the other end away from the roller. Thus, the roller can contact the blocking member and change position when the movable base moves.

[0022] The feature of this invention is that the driving mechanism can drive the moving seat to move when the movable hook is in contact with the hooked part of the movable clamp, so that the moving seat can drive the clamping mechanism to move closer to the bobbin case to clamp the bobbin thread. When the movable hook is in contact with the fixed seat connection part of the moving seat, the driving mechanism can drive the moving seat to move, so that the moving seat can drive the clamping mechanism away from the bobbin case to pull the bobbin thread out of the bobbin case. In this way, after the inner threading machine cuts the needle thread and the bobbin thread, the bobbin thread pulling device can automatically pull the bobbin thread out of the bobbin case, so that a longer bobbin thread can be reserved on the outside of the bobbin case. This not only helps the inner threading machine to produce a sufficiently long thread end on the surface of the shoe inside when it starts sewing again, but also significantly improves the convenience for the operator to perform the subsequent knotting process.

[0023] Furthermore, when the movable hook is in contact with the hooked part of the movable clamp or the connecting part of the fixed seat, the drive mechanism can drive the moving seat and the clamping mechanism to move synchronously, so that the blocking member can contact the movable clamp to drive the clamping part of the movable clamp away from the fixed clamp. Thus, the drive mechanism drives the movable hook to move, and the movable hook can hook onto the hooked part to keep the clamping mechanism in the open state. In addition, the drive mechanism drives the movable hook to separate from the hooked part, so that the clamping mechanism changes from the open state to the closed state through the elastic member. In this way, the thread pulling device only needs to use a single drive mechanism to realize the switching between the open and closed states of the movable clamping mechanism and the clamping mechanism, thereby effectively reducing the cost of electrical control.

[0024] In addition, a resistance mechanism is provided between the fixed seat and the movable seat. The resistance mechanism is used to appropriately increase the resistance of the movable seat relative to the fixed seat. In this way, the resistance mechanism can adjust the movement resistance of the movable seat, so that the movable hook will not move synchronously with the movable seat in the initial stage when it is driven by the drive mechanism. Instead, it can move relative to the movable seat to selectively approach or move away from the hook part of the movable fixture. This effectively ensures that the movable hook can reliably engage or disengage from the hook part of the movable fixture. Even when the movable seat is driven by the drive mechanism with the movable hook in contact with the hook part, increasing the resistance of the movable seat relative to the fixed seat can also prevent the weight of the movable seat from causing the movable hook to disengage from the hook part, thereby ensuring the stability of the movable seat's movement.

[0025] Furthermore, a buffer assembly is provided between the fixed seat and the movable seat. When the drive mechanism drives the piston rod to extend outward to the limit position of the stroke, the buffer assembly can prevent the movable seat from directly hitting the fixed seat and making excessive noise, thereby reducing the noise generated when the line drawing device is operating.

[0026] Finally, the clamping mechanism's fixed clamp is equipped with a hook plate. The hook plate can deform and has a hook portion that bends toward the fixed clamp. When the bottom thread is close to the surface of the shuttle housing, the hook portion of the hook plate can not only effectively pick up the bottom thread from the surface of the shuttle housing, but also guide the bottom thread between the fixed clamp and the movable clamp, thereby improving the success rate of the fixed clamp and the movable clamp clamping the bottom thread together. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the bottom-line device of this utility model installed on the internal wiring unit;

[0028] Figure 2 This is an exploded view of the bottom-line device of this utility model installed on the internal wiring machine;

[0029] Figure 3 This is a perspective view of the bottom-pulling device of the present invention in a first preferred embodiment;

[0030] Figure 4 This is a side view of the bottom-pulling device of the present invention in a first preferred embodiment;

[0031] Figure 5 This is an exploded view of the bottom-pulling device of the present invention in a first preferred embodiment;

[0032] Figure 6 This is a cross-sectional view of the thread-pulling device of this utility model in a first preferred embodiment;

[0033] Figure 7 An exploded view of the movable clamp;

[0034] Figure 8 An exploded view of the clamping mechanism connected to the movable base;

[0035] Figure 9 A cross-sectional view of the resistance mechanism mounted on the movable clamp;

[0036] Figure 10 This is a schematic diagram showing the movable hook located inside the movable groove;

[0037] Figure 11A This is a schematic diagram of the clamping mechanism in the standby position.

[0038] Figure 11B A schematic diagram showing the clamping mechanism opening when the movable clamp contacts the blocking element;

[0039] Figure 11C A schematic diagram showing the hook of the activity card being attached to the activity fixture;

[0040] Figure 11D This is a schematic diagram showing the clamping mechanism in the clamping position.

[0041] Figure 11E A schematic diagram showing the positioning bead inserted into the positioning groove;

[0042] Figure 11F A schematic diagram showing the retraction of the buffer telescopic rod towards the inside of the buffer;

[0043] Figure 11G A schematic diagram showing the moment the movable hook separates from the movable clamp;

[0044] Figure 11H A schematic diagram showing the clamping mechanism pulling back the baseline;

[0045] Figure 11I A schematic diagram showing the release of the baseline by the clamping mechanism;

[0046] Figure 11J A schematic diagram showing the clamping mechanism changing from an open state to a closed state as it moves away from the shuttle housing;

[0047] Figure 12 This is a side view of the bottom-pulling device of the present invention in a second preferred embodiment.

[0048] Explanation of reference numerals in the attached drawings: 1-Pulling device; 10-Drive mechanism; 11-Cylinder; 12-Piston; 13-Piston rod; 20-Moving clamp; 21-Fixed seat; 22-Moving seat; 221-Fixed seat connection; 222-Clamp connection; 223-Moving groove; 223a-Open end; 223b-Closed end; 224-Resistance groove; 225-Stop; 23-Positioning component; 231-Positioning groove; 232-Positioning bead; 24-Buffer. Components; 241-Buffer; 242-Buffer telescopic rod; 243-Buffer baffle; 30-Clamping mechanism; 31-Fixed clamp; 32-Modible clamp; 321-Modible clamping arm; 321a-Clamping part; 321b-Hooked part; 321b1-Hooked block; 321b2-Hooked recess; 321b3-Curved convex surface; 321c-Protruding column; 322-Swing arm; 322a-Slot; 323-Roller; 33-Hook plate; 331-Hook Thread plate connection part; 332-Hook part; 40-Elastic element; 50-Resistance mechanism; 51-Resistance frame; 52-Resistance contact element; 53-Resistance adjustment element; 54-Resistance spring; 60-Blocking element; 61-Starting edge; 62-First starting section; 63-Stop section; 64-Second starting section; 70-Modible hook; 71-Hook block; 72-Hook recess; 73-Curved concave surface; 80-Inner thread machine; 81-Sewing body; 811-Sewing head; 81 2-Support; 82-Rocker arm body; 821-Rocker arm; 822-Rocker handle; 823-Spindle head support; 824-Spindle head cover; 825-Spindle head space; 826-Slot; 83-Bearing seat; 84-Pivot seat; 85-Needle; 86-Rotary shuttle; 87-Spindle case; A1-Closed state; A2-Open state; F1-Elastic force; F2-Frictional force; L-Bottom line; P1-Standby position; P2-Clamping position; R-Clamping movement area. Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments and accompanying drawings. The advantages and features of the present invention will become clearer with the description.

[0050] Please see Figure 1 and Figure 2As shown, this utility model provides a bobbin threading device 1 for use with an inner thread sewing machine 80. The inner thread sewing machine 80 has four parts: a sewing body 81, a rocker arm body 82, a bearing seat 83, and a pivot seat 84. A part of the sewing body 81 is configured as a sewing head 811 to mount a needle 85 capable of longitudinal movement, while the remaining part of the sewing body 81 is configured as a support 812 connected to the bearing seat 83. In addition, the rocker arm body 82 is provided with a rocker arm 821 connected to the pivot seat 84, a rocker handle 822 connected to the rocker arm 821, a shuttle head support 823 connected to the rocker handle 822, and a support 823 connected to the shuttle head support. The bobbin case 824 of the frame 823 has a bobbin space 825 formed inside the bobbin case 824, and the upper part of the bobbin case 824 has a slot 826 communicating with the bobbin space 825, through which the needle 85 can pass. The pivot seat 84 is pivotally connected to the bearing seat 83, so that the rocker arm body 82 is pivotally connected to the sewing body 81 via the pivot seat 84 and the bearing seat 83, and thus the rocker arm body 82 can swing relative to the sewing body 81. In this embodiment, a rotatable rotary hook 86 and a bobbin case 87 connected to the rotary hook 86 are installed inside the bobbin case 824 in the bobbin space 825.

[0051] Please see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in the first preferred embodiment, the bottom-pulling device 1 mainly consists of a drive mechanism 10, a movable clamp 20, a clamping mechanism 30, an elastic element 40, a resistance mechanism 50, a blocking element 60, and a movable hook 70. Please refer to [link to relevant documentation]. Figure 4 , Figure 5 and Figure 6 As shown, the drive mechanism 10 is connected to the movable clamp 20. In this embodiment, the drive mechanism 10 is a pneumatic cylinder, so that the drive mechanism 10 has three parts: a cylinder body 11, a piston 12 and a piston rod 13.

[0052] Please see Figure 2 , Figure 5 and Figure 7As shown, the movable clamp 20 has four parts: a fixed seat 21, a movable seat 22, a positioning component 23, and a buffer component 24. The fixed seat 21 is connected to the cylinder 11 of the driven mechanism 10, and the fixed seat 21 is fixed to the head 811 of the sewing body 81, so that both the fixed seat 21 and the cylinder 11 are positioned at the head 811 and cannot move relative to the head 811. A part of the movable seat 22 is movably connected to the fixed seat 21 and is configured as a fixed seat connecting part 221, so that the movable seat 22 can be... The movable seat 22 moves relative to the fixed seat 21, and the remaining part of the movable seat 22 is a clamping connection 222 extending from the fixed seat connection 221, as shown in the figure. The movable seat 22 has a movable groove 223 and a resistance groove 224 spaced apart from the movable groove 223 in the fixed seat connection 221. One end of the movable groove 223 is an open end 223a close to the clamping connection 222, and the other end of the movable groove 223 away from the open end 223a is a closed end 223b. Both the positioning component 23 and the buffer component 24 are disposed between the fixed base 21 and the movable base 22. In this embodiment, the positioning component 23 has a positioning groove 231 formed in the fixed base connecting portion 221 and a positioning bead 232 connected to the fixed base 21. The positioning bead 232 is elastic and can extend and retract relative to the fixed base 21. When the movable base 22 moves relative to the fixed base 21 to its travel limit position, the positioning groove 231 can align with the positioning bead 232. In addition, the buffer component 24 is used to prevent... When the movable seat 22 reaches its travel limit position, it directly impacts the fixed seat 21, thereby reducing the noise generated when the movable seat 22 reaches its travel limit position. The buffer assembly 24 has a buffer 241 connected to the fixed seat 21, a buffer telescopic rod 242 movably assembled to the buffer 241, and a buffer baffle 243 connected to the movable seat 22. When the movable seat 22 moves relative to the fixed seat 21, the buffer baffle 243 can contact the buffer telescopic rod 242 through the moving movable seat 22.

[0053] Please see Figure 4 , Figure 5 and Figure 8 As shown, the clamping mechanism 30 comprises three parts: a fixed clamp 31, a movable clamp 32, and a hook plate 33. The clamping mechanism 30 is mounted on the movable seat 22 of the movable clamping base 20, allowing the fixed clamp 31, movable clamp 32, and hook plate 33 to move synchronously with the movable seat 22. The range traversed by the movable clamp 32 is defined as a clamping movement area R (e.g., ...). Figure 11AAs shown in the figure, in this embodiment, the fixed clamp 31 is fixed to the clamp connection portion 222 of the movable seat 22, so that the fixed clamp 31 cannot move relative to the clamp connection portion 222. The movable clamp 32 is composed of three components: one component is a movable clamping arm 321, another component is a swing arm 322, and the last component is a roller 323. As shown in the figure, the central area of ​​the movable clamping arm 321 is pivotally connected to the clamp connection portion 222, so that the movable clamping arm 321 can swing relative to the movable seat 22. When the movable clamping arm 321 pivots... When connected to the clamping connection 222, the movable clamping arm 321 is adjacent to the opening end 223a of the moving groove 223. The movable clamping arm 321 has a clamping portion 321a on the side away from the moving groove 223, and a latching hook portion 321b spaced apart from the fixed base connection 221 on the side near the moving groove 223. Furthermore, the movable clamping arm 321 protrudes between the clamping portion 321a and the latching hook portion 321b to form a protrusion 321c. In this embodiment, the latching hook portion 321b is provided with a latching hook block 321. b1 has a hook recess 321b2 adjacent to the hook block 321b1, and the outermost side of the hook block 321b1 has an arcuate convex surface 321b3. Additionally, one end of the swing arm 322 is pivotally connected to the roller 323, and the other end of the swing arm 322 forms a slot 322a. The width of the slot 322a is greater than the diameter of the protrusion 321c, and the protrusion 321c can pass through the slot 322a, allowing the swing arm 322 to be movably connected to the movable clamping arm 321 at the end away from the roller 323. The central region is pivotally connected to the fixed base connection portion 221, allowing the swing arm 322 to swing relative to the movable base 22 to change the relative position of the protrusion 321c and the slot 322a, thereby causing the movable clamping arm 321 to swing in the opposite direction. Furthermore, the hook plate 33 is made of an elastic material, allowing it to deform. The hook plate 33 has a hook plate connection portion 331 connected to the fixed clamp 31 and a hook portion 332 extending from the hook plate connection portion 331. The hook portion 332 bends towards the direction closer to the fixed clamp 31.

[0054] Please see Figure 4 and Figure 8As shown, the elastic element 40 is disposed between the clamping connection portion 222 of the movable seat 22 and the movable clamping arm 321 of the movable clamp 32, so that both the fixed clamp 31 and the movable clamp 32 are pressed against the elastic element 40, causing the elastic element 40 to deform inward to generate an elastic force F1 acting on the movable clamp 32. The elastic element 40 can push the movable clamp 32 through the elastic force F1, so that the movable clamp 32 can swing counterclockwise relative to the fixed seat 21, allowing the clamping portion 321a of the movable clamping arm 321 to approach the fixed clamp 31, and then the clamping portion 321a can contact the fixed clamp 31, so that the clamping portion 321a and the fixed clamp 31 can form a closed state A1.

[0055] Please see Figure 5 and Figure 9 As shown, the resistance mechanism 50 is disposed between the fixed seat 21 and the movable seat 22 of the movable clamp 20. The resistance mechanism 50 increases the resistance to the movement of the movable seat 22 relative to the fixed seat 21. Therefore, the resistance mechanism 50 can adjust or limit the movement resistance of the movable seat 22. The resistance mechanism 50 comprises four parts: a resistance frame 51 connected to the fixed seat 21, a resistance contact member 52 passing through the inside of the resistance frame 51, a resistance adjustment member 53 movably connected to the inside of the resistance frame 51, and a resistance spring 54 disposed between the resistance contact member 52 and the resistance adjustment member 53. The resistance spring 54 is located inside the resistance frame 51, and both the resistance contact member 52 and the resistance adjustment member 53 can jointly press against the resistance spring 54, causing the resistance spring 54 to deform inwards. A continuous frictional force F2 is generated on the resistance contact 52, and the frictional force F2 of the resistance spring 54 pushes the resistance contact 52, allowing the resistance contact 52 to contact the resistance groove 224 of the moving seat 22. In addition, the resistance adjustment member 53 can move relative to the resistance frame 51 to get closer to the resistance contact 52, so that the compression of the resistance spring 54 can be increased to increase the magnitude of the frictional force F2. Conversely, the resistance adjustment member 53 can move relative to the resistance frame 51 to get away from the resistance contact 52, so that the compression of the resistance spring 54 can be reduced to decrease the magnitude of the frictional force F2. In this way, the movement of the resistance adjustment member 53 relative to the resistance frame 51 can change the compression of the resistance spring 54, and can adjust the magnitude of the frictional force F2.

[0056] Please see Figure 2 and Figure 4As shown, the blocking member 60 is connected to the fixed seat 21 of the movable clamp 20 inside the clamp moving area R. The blocking member 60 has an starting edge 61 on the upper side near the fixed seat 21. The starting edge 61 is provided with a first starting section 62 in an inclined state, a stop section 63 in a horizontal state and a second starting section 64 in an inclined state in sequence. The inclination direction of the second starting section 64 is opposite to that of the first starting section 62.

[0057] Please see Figure 5 and Figure 10 As shown, the movable hook 70 has a hook block 71 and a hook recess 72 adjacent to the hook block 71. The movable hook 70 is located inside the movable groove 223 of the movable seat 22, so that the movable hook 70 is disposed between the fixed seat connecting part 221 and the hooked part 321b. The outermost side of the hook block 71 is provided with an arc-shaped concave surface 73. The movable hook 70 is connected to the piston rod 13 of the drive mechanism 10, so that the drive mechanism 10 can drive the movable hook 70 to move back and forth between the fixed seat connecting part 221 and the hooked part 321b. In this embodiment, the movable clamp 20 is provided with a stop 225 fixed to the fixed seat connecting part 221 inside the movable groove 223, so that the stop 225 can limit the movement range of the movable hook 70 inside the movable groove 223.

[0058] Please see Figures 11A to 11J As shown, the thread pulling device 1 can pull a thread L installed in the shuttle housing 87 out of the shuttle housing 87 in a specific application. First, as... Figure 11A As shown, the clamping mechanism 30 is in a standby position P1, which moves the clamping mechanism 30 away from the shuttle housing 87 of the rocker arm body 82. When the clamping mechanism 30 is in the standby position P1, the movable clamping arm 321, through the elastic force F1 of the elastic member 40, will cause the clamping part 321a of the movable clamping arm 321 to contact the fixed clamp 31 of the clamping mechanism 30, so that the clamping part 321a and the fixed clamp 31 are kept in a closed state A1. At the same time, the hook block 71 of the movable hook 70 will engage the hook block 321b1 located on the movable clamping arm 321 (e.g., Figure 10 As shown in the figure, in this embodiment, when the hook block 71 is positioned on the hook block 321b1, the curved convex surface 321b3 of the hook block 321b1 contacts the curved concave surface 73 of the movable hook 70, so that the contact relationship between the movable hook 70 and the movable clamping arm 321 presents the characteristics of curved surface contact. At the same time, the movable hook 70 will contact the stop block 225 of the movable clamping seat 20 on the side away from the curved concave surface 73, so that the movable hook 70 cannot move inside the movable groove 223 of the movable seat 22 temporarily.

[0059] Please see Figure 11BAs shown, when the drive mechanism 10 is activated to extend the piston rod 13 outward, with the curved convex surface 321b3 of the hook block 321b1 in contact with the curved concave surface 73 of the movable hook 70, the drive mechanism 10 can drive the movable seat 22 of the movable clamp 20 to move towards the shuttle case 87 of the rocker arm body 82. This causes the roller 323 of the movable clamp 32 to first contact the first starting section 62 of the blocking member 60. Next, the roller 323 moves along the slope of the first starting section 62, allowing the swing arm 322 of the movable clamp 32 to swing counterclockwise relative to the movable seat 22 to change the relative position between the protrusion 321c of the movable clamp arm 321 and the slot 322a of the swing arm 322 (see [reference]). Figure 4 As shown), the movable clamping arm 321 then swings clockwise, allowing the clamping portion 321a of the movable clamping arm 321 to move away from the fixed clamp 31, thus changing both the clamping portion 321a and the fixed clamp 31 from a closed state A1 to an open state A2. During this process, because the contact between the movable hook 70 and the movable clamping arm 321 is an arc-shaped surface contact, the movable clamping arm 321 can achieve contact on the arc-shaped convex surface 32. When 1b3 is in contact with the curved concave surface 73, it rotates clockwise, thereby causing the hook block 71 of the movable hook 70 and the hooked block 321b1 of the movable clamping arm 321 to be misaligned. When the roller 323 moves to the junction between the first starting section 62 and the stopping section 63, the curved convex surface 321b3 will not contact the curved concave surface 73, so that the hook block 71 will engage with the hooked recess 321b2 located on the movable clamping arm 321, and the hooked block 321b1 will simultaneously engage with the hook recess 72 located on the movable hook 70.

[0060] Please see Figure 11CAs shown, when the hook block 71 of the movable hook 70 and the hooked block 321b1 of the movable clamping arm 321 respectively engage with the hooked recess 321b2 of the movable clamping arm 321 and the hook recess 72 of the movable hook 70, a gap will be generated between the movable hook 70 and the movable clamping arm 321. At this time, because a resistance mechanism 50 is provided between the fixed seat 21 and the movable seat 22 of the movable clamping base 20, when the piston rod 13 of the drive mechanism 10 continues to extend outward, the movable hook 70 will not move synchronously with the movable seat 22, but the movable hook 70 can move relative to the movable seat 22. The hook portion 321b near the movable clamp 32 allows the hook block 71 to be embedded inside the hook recess 321b2, and the hook portion 321b is embedded inside the hook recess 72, preventing the movable clamp arm 321 of the movable clamp 32 from pivoting relative to the movable seat 22. As a result, the clamping portion 321a of the movable clamp arm 321 and the fixed clamp 31 are both kept in the open state A2. When the movable hook 70 is hooked on the hook portion 321b, the movable hook 70 will separate from the stop block 225 of the movable clamp seat 20, so that the movable hook 70 will have a gap with the stop block 225.

[0061] Please see Figure 11D , Figure 11E and Figure 11FAs shown, because the movable hook 70 is hooked onto the hooked portion 321b of the movable clamp 32, the piston rod 13 of the drive mechanism 10 continues to extend outward to drive the movable seat 22 of the movable clamp 20 to move. Even though the roller 323 has disengaged from the blocking member 60, the movable clamp 32 and the fixed clamp 31 remain in the open state A2. The buffer baffle 243 of the buffer assembly 24 can be pushed against the buffer telescopic rod 242 of the buffer assembly 24 by the moving movable seat 22, causing the buffer telescopic rod 242 to retract toward the inside of the buffer 241 to reduce the sound produced when the drive mechanism 10 drives the movable seat 22 to the limit position of the stroke and hits the fixed seat 21. The moving movable seat 22 causes the positioning groove 231 of the positioning assembly 23 to gradually approach the positioning bead 232 of the positioning assembly 23. When the positioning groove When the positioning bead 232 is positioned relative to the fixed seat 21, the positioning bead 232 can be inserted into the positioning groove 231 by elastic force, so that the moving seat 22 will generate greater resistance when it moves relative to the fixed seat 21. At the same time, the buffer telescopic rod 242 is compressed to the travel limit of the buffer 241, and the clamping mechanism 30 will approach the shuttle shell 87 of the swing arm 322 body to be positioned at a clamping position P2. In this embodiment, during the process of the moving seat 22 moving relative to the fixed seat 21 to drive the clamping mechanism 30 toward the clamping position P2, the resistance contact member 52 of the resistance mechanism 50 contacts the resistance groove 224 of the moving seat 22 through the resistance spring 54 of the resistance mechanism 50, thereby increasing the resistance of the moving seat 22 moving relative to the fixed seat 21 to prevent the weight of the moving seat 22 from causing the movable hook 70 to disengage from the hooked part 321b.

[0062] Please see Figure 11G and Figure 11HAs shown, when the clamping mechanism 30 enters the clamping position P2, the hook portion 332 of the hook plate 33 can effectively pick out the bottom thread L that may be attached to the surface of the shuttle case 87. Furthermore, the hook portion 332 can guide the bottom thread L between the fixed clamp 31 and the clamping portion 321a of the movable clamp 32 of the clamping mechanism 30. Next, the drive mechanism 10 is activated to retract the piston rod 13 inward. At this time, because there is a gap between the movable hook 70 and the stop block 225, the movable hook 70, in the initial stage of being driven by the drive mechanism 10, passes through the positioning component 23. The movable hook 70 does not move synchronously with the movable seat 22 due to the resistance generated by the resistance mechanism 50. Instead, it can move independently relative to the movable seat 22 to move away from the hook portion 321b of the movable clamp 32, allowing the movable hook 70 to approach the stop block 225 of the movable clamp 20. When the movable hook 70 contacts the stop block 225, the hook block 71 of the movable hook 70 will leave the hook recess 321b2 of the movable clamp arm 321, and the hook block 321b1 of the movable clamp arm 321 will simultaneously leave the hook recess 72 of the movable hook 70. At this time, The elastic element 40, through the elastic force F1, pushes the movable clamping arm 321, causing the movable clamping arm 321 to swing counterclockwise relative to the movable seat 22. Consequently, the latching block 321b1 of the movable clamping arm 321 approaches the latching block 71 of the movable latch 70, causing the arcuate convex surface 321b3 of the movable clamping arm 321 to contact the arcuate concave surface 73 of the movable latch 70. Simultaneously, the clamping portion 321a of the movable clamping arm 321 approaches the fixed clamp 31, causing both the clamping portion 321a and the fixed clamp 31 to change from an open state A2 to a closed state A1, thus the clamping portion 321a... Both 21a and the fixed clamp 31 are clamped together on the bottom thread L. During the counterclockwise swing of the movable clamping arm 321, the relative position between the protrusion 321c of the movable clamping arm 321 and the slot 322a of the swing arm 322 can be changed, so that the swing arm 322 of the movable clamping arm 32 swings clockwise. Then, the piston rod 13 of the drive mechanism 10 continues to retract inward, and begins to drive the moving seat 22 away from the shuttle shell 87 of the rocker arm body 82, so that the clamping mechanism 30 pulls the bottom thread L out of the shuttle shell 87 to increase the length of the thread end of the bottom thread L outside the shuttle shell 87.

[0063] Please see Figure 11IAs shown, as the moving seat 22 moves away from the shuttle housing 87, the roller 323 of the movable clamp 32 gradually approaches the second starting section 64 of the blocking member 60. Subsequently, the roller 323 moves along the slope of the second starting section 64, allowing the swing arm 322 of the movable clamp 32 to swing counterclockwise relative to the moving seat 22 to change the relative position between the protrusion 321c of the movable clamp arm 321 and the slot 322a of the swing arm 322. As a result, the movable clamp arm 321 swings clockwise, allowing the clamping part 321a of the movable clamp arm 321 to move away from the fixed clamp 31, so that both the clamping part 321a and the fixed clamp 31 are turned into an open state A2 to release the bottom line L, so that the clamping mechanism 30 no longer pulls out the bottom line L.

[0064] Please see Figure 11J As shown, the piston rod 13 of the drive mechanism 10 continues to retract inward, and the roller 323 of the movable clamp 32 moves towards the first starting section 62 of the blocking member 60 after passing the stop section 63 of the blocking member 60. When the roller 323 is located at the junction between the stop section 63 and the first starting section 62, the elastic member 40 pushes the movable clamp arm 321 through the elastic force F1, so that the movable clamp arm 321 of the movable clamp 32 can swing counterclockwise relative to the moving seat 22 to change the relative position between the protrusion 321c of the movable clamp arm 321 and the slot 322a of the swing arm 322. Then, the swing arm 322 of the movable clamp 32 swings clockwise. At the same time, the clamping part 321a of the movable clamp arm 321 can move away from the fixed clamp 31, so that the clamping part 321a and the fixed clamp 31 return to the closed state A1. When the drive mechanism 10 completes the return stroke, the clamping mechanism 30 stays in the standby position P1 (e.g. Figure 11A As shown in the figure, in this embodiment, adjusting the position of the blocking member 60 can control the length of the bottom line L pulled out, and the stop section 63 is designed to have a considerable length to prevent the clamping mechanism 30 from clamping the bottom line L again when it changes from the open state A2 to the closed state A1.

[0065] Please see Figure 12As shown, in the second preferred embodiment, the difference from the first preferred embodiment lies in the number of components of the movable clamp 32 and the position of the blocking member 60 on the fixed base 21. The structural forms of the drive mechanism 10, movable clamp 20, elastic member 40, resistance mechanism 50, and movable hook 70 are the same as in the first preferred embodiment. Therefore, the structural forms of the drive mechanism 10, movable clamp 20, elastic member 40, resistance mechanism 50, blocking member 60, and movable hook 70 will not be described again in this embodiment. In this embodiment, the movable clamp 32 is composed of two components, one of which is a movable clamping arm 321, and the last... The component is a roller 323, which is directly pivotally connected to the movable clamping arm 321. In addition, a blocking member 60 is provided on the lower side of the fixed base 21. The first starting section 62 of the blocking member 60 is inclined to the upper right, and the second starting section 64 of the blocking member 60 is inclined to the lower right. Thus, when the movable base 22 of the movable clamping base 20 moves through the drive mechanism 10 to bring the roller 323 close to the blocking member 60, the roller 323 will contact the first starting section 62 of the blocking member 60, causing the movable clamping arm 321 to swing clockwise. As a result, the clamping part 321a of the movable clamping arm 321 and the fixed clamp 31 will be in an open state A2.

[0066] The above description is illustrative only and not restrictive. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope of the technical concept, but all will fall within the protection scope of this utility model.

Claims

1. A bottom-pulling device for use with an internal wiring unit, characterized in that, include: A movable clamp has a fixed base connected to the internal communication unit and a movable base movable relative to the fixed base. The movable base is provided with a fixed base connecting portion movably connected to the fixed base and a clamp connecting portion extending from the fixed base connecting portion. A clamping mechanism has a fixed clamp fixed to the clamp connecting part and a movable clamp movably connected to the movable seat. The fixed clamp and the movable clamp can move synchronously with the movable seat, such that the range through which the movable clamp moves is defined as a clamp moving area. The movable clamp is provided with a hook part spaced apart from the fixed seat connecting part and a clamping part that can contact the fixed clamp. An elastic element is used to act on the movable clamp, so that the clamping part can approach the fixed clamp, and thus the clamping part and the fixed clamp can be in a closed state. A blocking member is positioned in the moving area of ​​the clamp, such that the blocking member can contact the movable clamp when the moving seat moves, while the clamping part can move away from the fixed clamp, so that the clamping part and the fixed clamp can change from the closed state to the open state. A movable latch is provided between the connecting part of the fixed base and the latched part; and A driving mechanism is provided to drive the movable hook to move back and forth between the fixed base connection part and the hooked part, and the driving mechanism can drive the movable base to move when the movable hook contacts the hooked part or the fixed base connection part. During the process of the clamping part and the fixed clamp changing from the closed state to the open state, the movable hook is driven by the driving mechanism to approach the hooked part, so that the movable hook can hook onto the hooked part, preventing the movable clamp from pivoting relative to the moving seat, and thus the clamping part and the fixed clamp can remain in the open state. The driving mechanism causes the movable hook to separate from the hooked part, so that the elastic element drives the movable clamp to pivot, and the clamping part can approach the fixed clamp, so that the clamping part and the fixed clamp change from the open state to the closed state.

2. The thread-pulling device according to claim 1, characterized in that, The movable hook has a hook block and a hook recess adjacent to the hook block, and the hooked part has a hook block and a hook recess adjacent to the hook block. When the clamping part and the fixed clamp are in the closed state, the hook block will be positioned on the hooked block, so that when the movable hook approaches the movable clamp through the driving mechanism, the hook block will contact the hooked block.

3. The thread-pulling device according to claim 2, characterized in that, When both the clamping part and the fixed clamp are in the open state, the hook block will be positioned in the hook recess, and the hooked part will be positioned in the hook recess at the same time, so that when the movable hook approaches the movable clamp through the driving mechanism, the hook block can be fitted into the interior of the hook recess, and the hooked part will be fitted into the interior of the hook recess.

4. The thread-pulling device according to claim 2, characterized in that, The hook block has an arcuate convex surface on one side that contacts the hook block, and the hook block has an arcuate concave surface that contacts the arcuate convex surface. When the movable clamp contacts the blocking member, the movable clamp can rotate in the state where the arcuate convex surface contacts the arcuate concave surface.

5. The thread-pulling device according to claim 1, characterized in that, When the movable hook contacts the hooked part, the drive mechanism can drive the clamping mechanism to a clamping position via the movable seat, so that the clamping mechanism is close to a rotary hook of the internal line machine. The movable clamp also has a positioning component, which is disposed between the fixed seat and the movable seat, and is used to ensure that the moving clamping mechanism can be accurately stopped at the clamping position.

6. The thread-pulling device according to claim 5, characterized in that, The positioning component has a positioning bead and a positioning groove. The positioning bead is formed in one of the fixed base and the movable base, and the positioning groove is formed in the other of the fixed base and the movable base. A portion of the positioning bead can be inserted into the positioning groove, so that the clamping mechanism is positioned in the clamping position.

7. The thread-pulling device according to claim 5, characterized in that, A buffer assembly is provided between the fixed seat and the movable seat. The buffer assembly prevents the movable seat from directly impacting the fixed seat and making noise when the clamping mechanism reaches the clamping position. The buffer assembly has a buffer connected to the fixed seat, a buffer telescopic rod movably assembled to the buffer, and a buffer baffle connected to the movable seat. The buffer baffle can contact the buffer telescopic rod as the clamping mechanism moves toward the rotary hook, causing the buffer telescopic rod to retract toward the inside of the buffer. When the buffer telescopic rod stops moving relative to the buffer, the clamping mechanism is in the clamping position.

8. The thread-pulling device according to claim 1, characterized in that, The stringing device also has a resistance mechanism disposed between the fixed seat and the movable seat, the resistance mechanism being used to adjust the movement resistance of the movable seat.

9. The thread-pulling device according to claim 1, characterized in that, The clamping mechanism also has a hook plate that can deform and has a hook plate connecting part connected to the fixing clamp and a hook part extending from the hook plate connecting part, the hook part bending toward the fixing clamp.

10. The thread-pulling device according to claim 1, characterized in that, The movable clamp has a movable clamping arm pivotally connected to the clamping connection part, a swing arm pivotally connected to the fixed base connection part, and a roller pivotally connected to one end of the swing arm. The movable clamping arm is provided with the hook part and the clamping part, and the swing arm is movably connected to the movable clamping arm at the end away from the roller. The roller can contact the blocking member and change position when the movable base moves.

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