Automatic thread changing device for sewing machine

Abstract

The present invention relates to the technical field of sewing machines, and in particular to an automatic bottom thread changing device for sewing machines, which comprises a base, a shuttle grabbing mechanism for grabbing a bottom thread box, and an actuator for driving the shuttle grabbing mechanism to approach or move away from a sewing machine body. The present invention has the effect of improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machines, in particular to an automatic bottom thread changing device for sewing machines. Background Art

[0002] Garment processing is a labor-intensive industry. Sewing machines are widely used in the garment processing industry. Sewing machines use one or more sewing thread and surface thread to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. At present, intelligent and unmanned sewing equipment is constantly being used, contributing to the improvement of labor productivity and working conditions. The sewing thread used in the sewing machine is usually wound on the bobbin first, and then the bobbin with the sewing thread wound is installed in the bobbin case. The combination of the bobbin with the sewing thread wound and the bobbin case is called the bobbin case. Finally, the bobbin case is connected to the rotary hook of the sewing machine for sewing.

[0003] A bottom line box in the related art, referring to Figure 1 and Figure 5 , including a bobbin case 01 and a bobbin core 04, the bobbin case 01 includes a bobbin case body 011, a bolt piece 012, a sliding piece 013 and a tail hook 014 integrally formed at one end of the sliding piece 013, the sliding piece 013 is slidably connected to the bobbin case body 011, one end of the bolt piece 012 is hinged on the sliding piece 013, and the other end is suspended in the air and can be opened about 55 degrees, a square hole 0121 is provided on the bolt piece 012, a circular clamping hole 06 is provided on the sliding piece 013, and a cylindrical clamping groove 07 is provided on the body of the rotary hook 03. In a natural state, the tail hook 014 is away from the bobbin case body 011 and there is a gap, and the bolt piece 012 is close to the sliding piece 013. After the operator inserts the bobbin core 04 with the bottom line wound into the bobbin case 01 body, a new bottom line box 001 is assembled. After the new bobbin case 001 is inserted into the rotary hook 03, the bolt piece 012 naturally sticks to the sliding piece 013, and the circular clamping hole 06 of the sliding piece 013 is clamped into the cylindrical clamping groove 07 of the rotary hook 03 under the action of the spring force, and the bobbin case 001 is locked. When the bobbin of the new bobbin case 001 is used up, the bolt piece 012 on the bobbin case 01 is pulled, and the bolt piece 012 opens about 55 degrees. The sliding piece 013 slides toward the center of the bobbin case 01 along with the bolt piece 012, and the circular clamping hole 06 on the sliding piece 013 is disengaged from the cylindrical clamping groove 07 on the rotary hook 03, and the old bobbin case 001 can be taken out of the rotary hook 03. When the bolt piece opens about 55 degrees, the tail hook 014 on the sliding piece 013 clamps the outer edge of the bobbin core 04, and the bobbin core 04 will not slip out of the bobbin case 01. When the old bottom thread box is taken out, the bolt piece 012 is released, and the sliding piece 013 moves away from the bobbin case 01 body under the action of the spring, and the tail hook 014 releases the bobbin core 04. At this time, the old bobbin core 04 can be separated from the bobbin case 01.

[0004] Replacing the bobbin thread of a sewing machine is a tedious manual labor. Due to the limitation of the bobbin capacity, a new bobbin filled with bobbin thread can only be used for two to three minutes, which means that the sewing machine must stop operating every two to three minutes and manually replace the new bobbin thread box. Manual replacement of the bobbin thread box affects the overall production efficiency and has obvious shortcomings. Summary of the invention

[0005] In order to improve production efficiency, the present application provides an automatic bottom thread changing device for a sewing machine.

[0006] The present application provides a sewing machine automatic bottom thread changing device adopts the following technical solution:

[0007] The invention discloses an automatic bottom thread changing device for a sewing machine, comprising a base, a shuttle grabbing mechanism for grabbing a bottom thread box is arranged on the base, and an actuator for driving the shuttle grabbing mechanism to approach or move away from the sewing machine is arranged on the base.

[0008] By adopting the above technical solution: when in use, the operator starts the shuttle grabbing mechanism, which grabs the bottom line box on the hook of the sewing machine that has run out of bottom line, then starts the actuator to move the shuttle grabbing mechanism away from the sewing machine body, so that the bottom line box is pulled out from the hook of the sewing machine; then releases the shuttle grabbing mechanism to remove the old bottom line box; then the new bottom line box is grabbed by the shuttle grabbing mechanism, and the actuator drives the shuttle grabbing mechanism to approach the hook of the sewing machine and clamp the new bottom line box into the hook, then releases the shuttle grabbing mechanism, and moves the shuttle grabbing mechanism away from the sewing machine through the actuator. The above cycle realizes the automatic replacement of the bottom line box, and several bottom line boxes can be automatically replenished during one shutdown, which significantly improves the work efficiency compared with manual replacement. Therefore, the present application can significantly improve production efficiency.

[0009] Optionally, the shuttle grabbing mechanism includes a shuttle grabbing arm, a shuttle grabbing hook, a shuttle taking seat and a first driving component that drives the shuttle grabbing hook to move in a direction close to or away from the shuttle taking seat. One end of the shuttle grabbing arm is connected to the first driving component, and the other end is fixedly connected to the actuator. When the first driving component drives the shuttle grabbing hook to move in a direction close to the shuttle taking seat, the shuttle grabbing hook is inserted between the bolt plate and the sliding plate, forcing the bolt plate to open outward by about 55°, driving the sliding plate to move toward the center of the shuttle case, and the shuttle grabbing hook is inserted into the square hole and cooperates with the inclined surface of the shuttle taking seat to clamp the bolt plate; the circular clamping hole on the sliding plate is disengaged from the cylindrical clamping groove on the rotary shuttle, so that the bottom line box can be separated from the rotary shuttle; at the same time, the tail hook on the sliding plate clamps the outer edge of the bobbin core to prevent the bobbin core from slipping out of the bobbin case.

[0010] By adopting the above technical solution, when the bolt piece is opened to the maximum angle, the clamping part of the shuttle hook contacts the edge of the square hole of the bolt piece, and the outer side of the bolt piece contacts the inclined surface of the shuttle seat. At this time, the bolt piece is clamped between the shuttle seat and the shuttle hook, thereby achieving an accurate and stable grasping action of the bottom thread box. When the old bottom thread box is taken out of the rotary hook, at a predetermined position, the execution end of the first driving component drives the shuttle hook to move away from the shuttle housing body, thereby causing the clamping force on the bolt piece to disappear, and the bottom thread housing automatically falls out under the action of gravity.

[0011] The above actions are the same when taking out the old bottom thread shell and inserting the new bottom thread shell, but in reverse order.

[0012] Optionally, a turntable is rotatably connected to the base, a plurality of new bottom thread boxes are provided on the turntable, and a fourth driving component for driving the turntable to rotate is provided on the base.

[0013] By adopting the above technical solution, when in use, the operator places the bottom thread box with the bottom thread wound on the turntable. When feeding is needed, the operator can rotate the new bottom thread box to an appropriate position through the fourth drive assembly to facilitate feeding.

[0014] Optionally, the actuator includes a third drive assembly, a mounting flange, a second drive assembly and a cylindrical cam. A mounting flange and a cylindrical cam are provided at one end of the second drive assembly, a circular curve groove is provided on the side wall of the cylindrical cam, one end of the shuttle grabbing arm is inserted into the circular curve groove and is fixedly connected to the driving end of the second drive assembly. The circular curve groove includes a first groove, a second groove and a transition groove, the first groove and the second groove are both provided along the length direction of the cylindrical cam, one end of the transition groove is connected to the first groove, and the other end is connected to the second groove; the first groove extends in a direction close to the second drive assembly; the second groove extends in a direction away from the second drive assembly; when the shuttle grabbing arm is located in the first groove, the shuttle grabbing hook is arranged toward the rotating disk; when the shuttle grabbing arm is located in the second groove, the shuttle grabbing hook is arranged toward the rotary shuttle on the sewing machine. The third drive assembly is arranged below the base, and the central axis of the driving end of the third drive assembly is connected to the mounting flange. The second drive assembly and the cylindrical cam are respectively arranged on both sides of the mounting flange, the central axis of the second drive assembly passes through the mounting flange and extends into the cylindrical cam, a linear bearing is provided at one end of the cylindrical cam away from the mounting flange, and the central axis of the second drive assembly passes through the linear bearing.

[0015] By adopting the above technical solution, when the old bottom thread box on the rotary shuttle of the sewing machine is grabbed, the third driving assembly is started, the shuttle grabbing mechanism is away from the sewing machine body, and the old bottom thread box is pulled out. Then the second driving assembly is started, the central axis of the second driving assembly and the center of the cylindrical cam are slidably matched through the linear bearing, and the shuttle grabbing arm is driven to move in the direction away from the rotary shuttle of the sewing machine, and the shuttle grabbing arm passes through the second groove, the transition groove and the first groove in sequence, realizing the sliding match between the shuttle grabbing arm and the circular curve groove. After reaching the predetermined position, the first driving assembly drives the shuttle grabbing hook to move in the direction away from the bottom thread box, so that the clamping force between the shuttle grabbing hook and the shuttle taking seat disappears, and under the action of gravity, the old bottom thread box automatically falls off from between the shuttle grabbing hook and the shuttle taking seat.

[0016] The third drive assembly is started again, so that the shuttle grabbing mechanism moves toward the direction close to the turntable. At this time, the new bottom thread box on the turntable is located between the shuttle grabbing hook and the shuttle taking seat. The first drive assembly is started, driving the shuttle grabbing hook to complete the bottom thread box grabbing action again. Then, the third drive assembly drives the shuttle grabbing mechanism to move away from the turntable, so that the new bottom thread shell is removed from the turntable. After that, the second drive assembly is started again, and the central axis of the second drive assembly drives the shuttle grabbing arm to move, so that the shuttle grabbing arm passes through the first groove, the transition groove and the second groove in sequence; when the shuttle grabbing arm moves to the end of the second groove away from the second drive assembly, the third drive assembly is started again, so that the shuttle grabbing mechanism moves toward the direction close to the sewing machine body shuttle, until the new bottom thread box is clamped into the sewing machine body shuttle; the first drive assembly moves away from the bottom thread shell, releases the clamping of the bottom thread shell, and the circular clamping hole on the sliding sheet is clamped into the cylindrical clamping groove of the shuttle, and the bottom thread box is locked. Then, the third drive assembly drives the shuttle grabbing mechanism away from the shuttle, and the second drive assembly drives the shuttle grabbing mechanism to move away from the shuttle and toward the turntable. The automatic replacement of the bottom thread shell is realized, thus improving the working efficiency.

[0017] Optionally, a needle bearing is sleeved on the cylindrical shaft of the shuttle grabbing arm, and the needle bearing is slidably matched with the circular curve groove.

[0018] By adopting the above technical solution, when the shuttle grabbing arm moves in the circular curve groove, the needle bearing rolls on the side wall of the circular curve groove, reducing the friction between the shuttle grabbing arm and the circular curve groove, which is beneficial to ensuring the movement accuracy of the shuttle grabbing arm.

[0019] Optionally, the actuator includes a third drive assembly and a mounting flange, the third drive assembly is arranged below the base, and the central axis of the third drive assembly is connected to the mounting flange. The second drive assembly and the cylindrical cam are respectively arranged on both sides of the mounting flange, the central axis of the second drive assembly passes through the mounting flange and extends into the cylindrical cam, and cooperates with the cylindrical cam through a linear bearing.

[0020] By adopting the above technical solution, the third drive assembly drives the mounting flange and the cylindrical cam to perform first-order linear motion; the cylindrical cam and the second drive assembly drive the shuttle mechanism to perform second-order linear motion and simultaneously perform 90° reciprocating circular swing. By controlling the reciprocating sequence through the program, the complex reciprocating and swinging movements of the manipulator are realized, ensuring the stability of the circular swing and sufficient torque.

[0021] Optionally, a sliding block is provided above the base, and a sliding rail is provided on the side wall of the cylindrical cam, and the sliding rail is inserted into the sliding block and slidably cooperates with the sliding block.

[0022] By adopting the above technical solution, the accuracy and stability of the reciprocating linear motion of the actuator are guaranteed.

[0023] Optionally, the sewing machine is provided with a material receiving hose, one end of which is opened upward, and the other end is connected to a bottom thread magazine recovery box. When the shuttle grabbing arm moves to one end of the first slot close to the second cylinder, the old bottom thread shell clamped by the shuttle grabbing mechanism is located directly above the end of the material receiving hose that is opened upward. The material receiving hose is tilted downward in a direction close to the bottom thread magazine recovery box. A special winder for winding the bottom thread magazine that has used up the bottom thread is provided in the bottom thread magazine recovery box.

[0024] By adopting the above technical solution, once the shuttle grabbing mechanism releases the clamping of the old bobbin case, the old bobbin case will directly fall into the receiving hose and move into the bobbin box along the inclination direction of the receiving hose, thereby collecting the old bobbin case. Afterwards, the operator can rewind the old bobbin case with a special bobbin winder, which is easy to operate.

[0025] Optionally, the special winder includes a wire reel wound with raw bobbin thread, a wire passing post, a heat wire clamp, a thermal fuse, a stepper motor and a clamping post for clamping with an old bobbin, the wire reel is fixedly connected to the bobbin thread magazine recovery box, the wire passing post is vertically arranged on the bobbin thread magazine recovery box, a plurality of wire passing holes are provided on the wire passing post, the wire clamp and the thermal fuse are both arranged on the bobbin thread magazine recovery box, the stepper motor is arranged in the bobbin thread magazine recovery box, the motor shaft of the stepper motor is coaxially and fixedly connected to the clamping post, and the stepper motor is electrically connected to a control system.

[0026] By adopting the above technical solution, when in use, the operator clamps the bobbin on the clamping column, passes the raw material bottom thread on the bobbin through the thread hole on the thread passing column, passes through the thread clamp, and then passes through the thermal fuse, and finally winds it on the bobbin, and adjusts the tightness of the bottom thread by the thread clamp; then, the stepper motor is started through the control system, and the number of revolutions of the motor shaft of the stepper motor is set according to the length of the bottom thread that can be wound around the bobbin; when the number of revolutions of the stepper motor reaches a threshold, the control system turns off the stepper motor, and then the thermal fuse fuse melts the bottom thread, thereby achieving accurate winding of the bottom thread length on the bobbin.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. The present application sets a base, a shuttle grabbing mechanism and an actuator. When in use, the shuttle grabbing mechanism grabs the bottom thread box on the rotary hook of the sewing machine that has used up the bottom thread. Then the actuator moves the shuttle grabbing mechanism away from the sewing machine body, so that the bottom thread box is pulled out from the rotary hook of the sewing machine. The shuttle grabbing mechanism is released, and the old bottom thread box falls off. After that, a new bottom thread box is grabbed by the shuttle grabbing mechanism, and the actuator drives the shuttle grabbing mechanism to approach the rotary hook of the sewing machine and clamp the new bottom thread box into the rotary hook. After that, the shuttle grabbing mechanism is released, and the actuator moves the shuttle grabbing mechanism away from the sewing machine body. The above cycle realizes automatic replacement of the bottom thread box, which improves the work efficiency several times compared with manual replacement. Therefore, the present application can significantly improve production efficiency.

[0029] 2. The present application sets a first drive assembly, a shuttle grabbing arm, a shuttle grabbing hook and a shuttle taking seat, starts the first drive assembly, and the execution end drives the shuttle grabbing hook to move toward the hinged joint between the bolt plate and the sliding plate, and gradually inserts into the square hole of the bolt plate. The suspended end of the bolt plate opens in a direction away from the bobbin case body, and finally makes the shuttle grabbing hook collide with the edge of the square hole of the bolt plate, and the outer side of the bolt plate collide with the shuttle taking seat. At this time, the bolt plate is clamped between the shuttle taking seat and the shuttle grabbing hook, completing the grabbing action of the bobbin case. In this process, the locking and unlocking of the bottom line box and the rotary shuttle are completed at the same time, and the locking and unlocking actions of the bobbin core and the bobbin case are automatically completed. When the bobbin case needs to be removed from the shuttle grabbing hook, the first drive assembly is started, and the execution end of the first drive assembly drives the shuttle grabbing hook to move in a direction away from the hinged joint between the bolt plate and the bobbin case body, thereby causing the clamping force on the bolt plate to disappear, and the bobbin case falls out under the action of gravity. Therefore, the present application can accurately complete the grabbing action of complex parts such as the bobbin case.

[0030] 3. The present application controls the winding length through a stepper motor, so that the sewing machine can accurately calculate the time when the bottom thread is used up, avoiding the need to set a complicated bottom thread sensor on the rotary hook attachment of the sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The invention is a structural schematic diagram of a bobbin case, a bobbin case and a bobbin in the related art.

[0032] Figure 2 It is a structural schematic diagram of an automatic bottom thread changing device for a sewing machine in an embodiment of the present application.

[0033] Figure 3 It is a structural schematic diagram of the shuttle grabbing mechanism arranged toward the turntable in the embodiment of the present application.

[0034] Figure 4 It is a structural schematic diagram of the shuttle grabbing mechanism in the embodiment of the present application.

[0035] Figure 5 It is a cross-sectional view of the shuttle hook grasping the bolt piece in the embodiment of the present application.

[0036] Figure 6 Yes Figure 5 Enlarged view of part A.

[0037] Figure 7 It is a structural schematic diagram of the actuator in the embodiment of the present application.

[0038] Figure 8 It is a cross-sectional view of the internal structure of the cylindrical cam in the embodiment of the present application.

[0039] Fig. 9 It is a schematic diagram of the structure of the feeding assembly in the embodiment of the present application.

[0040] Fig.10 It is a schematic diagram of the structure of the recycling component in the embodiment of the present application.

[0041] Fig.11 It is a cross-sectional view of the special winding device structure in the embodiment of the present application.

[0042] Explanation of reference numerals: 001, bottom thread box; 01, bobbin case; 011, bobbin case body; 012, bolt plate; 013, sliding plate; 014, tail hook; 0121, square hole; 02, sewing machine; 03, rotary shuttle; 04, bobbin core; 06, circular clamping hole; 07, cylindrical clamping groove; 08, cylinder; 1, base; 2, shuttle grabbing mechanism; 21, first cylinder; 22, shuttle grabbing arm; 23, shuttle grabbing hook; 231, mounting portion; 232, hook tip portion; 233, transition portion; 234, clamping portion; 24, shuttle taking seat; 3, actuator; 31, third cylinder; 32, mounting flange; 33, cylindrical cam; 331, circular curve groove; 3311, first groove; 3312, second groove; 3313, transition groove; 34, second cylinder; 35, slider ; 36. Slide rail; 37. Linear bearing; 38. Needle bearing; 4. Feed assembly; 41. Drive motor; 42. Turntable; 43. Positioning column; 5. Recovery assembly; 51. Receiving hose; 52. Bottom line box recovery box; 53. Support plate; 6. Special winder; 61. Wire reel; 62. Wire passing column; 621. Wire passing hole; 63. Wire clamp; 64. Thermal cutoff; 65. Stepper motor; 66. Snap-on column. DETAILED DESCRIPTION

[0043] The following is combined with Figure 2-11 This application is described in further detail.

[0044] The present application discloses an automatic thread changing device for a sewing machine. Figure 2 , Figure 3 and Figure 4 A sewing machine automatic bottom thread changing device includes a base 1, which is arranged on the side wall of a sewing machine 02. The base 1 is provided with a shuttle grabbing mechanism 2 for grabbing a bottom thread box 001 and an actuator 3 for driving the shuttle grabbing mechanism 2 to approach or move away from the sewing machine 02 body. A rotary shuttle 03 is arranged on the sewing machine 02, and a cylinder 08 is arranged at the center of the rotary shuttle 03. A cylinder 08 card slot 07 is opened at the end of the cylinder 08.

[0045] Reference Figure 3 , Figure 4 and Figure 5The shuttle grabbing mechanism 2 includes a shuttle grabbing arm 22, a shuttle grabbing hook 23, a shuttle taking seat 24, and a first driving assembly driving the shuttle grabbing hook 23 to move in a direction close to or away from the shuttle taking seat 24, and the first driving assembly is a first cylinder 21. The first cylinder 21 is fixedly connected to the shuttle grabbing arm 22, and the shuttle grabbing hook 23 is fixedly connected to the piston rod of the first cylinder 21. The angle between the movement direction of the first cylinder 21 and the axis of the rotary shuttle 03 is 80°, and the shuttle taking seat 24 is fixedly connected to the first cylinder 21. The shuttle grabbing hook 23 includes a mounting portion 231, a hook tip portion 232, a transition portion 233, and a clamping portion 234. The mounting portion 231, the hook tip portion 232, the transition portion 233, and the clamping portion 234 are integrally formed.

[0046] Reference Figure 1 , Figure 5 and Figure 6 The mounting portion 231 of the shuttle grabbing hook 23 is fixedly connected to the first cylinder 21. When the piston rod of the first cylinder 21 retracts, the shuttle grabbing hook 23 gradually approaches the shuttle taking seat 24, and the hook tip 232 is inserted between the bolt piece 012 and the sliding piece 013. The bolt piece 012 slides and opens along the arc of the transition portion 233 of the shuttle grabbing hook 23. At this time, the sliding piece 013 slides toward the center of the bobbin case 01 as the bolt piece 012 opens. The circular clamping hole 06 of the sliding piece 013 is separated from the cylindrical clamping groove 07 on the rotary hook 03, and the bottom line box 001 can be taken out of the rotary hook 03; at the same time, the tail hook 014 is driven to move and clamp the bobbin core 04 to prevent the bobbin core 04 from separating from the bobbin case 01. When the bolt piece 012 opens outwards about 55 degrees, the shuttle hook 23 moves to the limit, and the clamping part 234 on the shuttle hook 23 presses the inclined surface against the edge of the square hole 0121 of the bolt piece 012, and presses the bolt piece 012 against the side wall of the shuttle seat 24, and the bolt piece 012 is clamped by the shuttle seat 24 and the shuttle hook 23. The shape of the hook back and the movement angle of the shuttle hook 23 ensure that the shuttle hook 23 will not interfere with any part of the rotary shuttle 03 during the movement.

[0047] Reference Figure 7 and Figure 8 The actuator 3 includes a third drive assembly, a mounting flange 32, a cylindrical cam 33, a second drive assembly, a slider 35 and a slide rail 36. The third drive assembly includes a third cylinder 31, and the second drive assembly includes a second cylinder 34. The slider 35 is installed on the base 1. A slide groove is provided on the slider 35. The slide rail 36 is installed below the cylindrical cam 33. The slider 35 and the slide rail 36 are both installed along the axis direction of the cylindrical cam 33. The slide rail 36 is inserted into the slide groove and slidably cooperates with the slide groove.

[0048] Reference Figure 7 and Figure 8The circular curve groove 331 formed on the side wall of the cylindrical cam 33 includes a first groove 3311, a second groove 3312 and a transition groove 3313. The first groove 3311 and the second groove 3312 are arranged in a direction parallel to the length of the cylindrical cam 33. One end of the transition groove 3313 is connected to the first groove 3311, and the other end is connected to the second groove 3312. The first groove 3311 extends in a direction close to the second cylinder 34, and the second groove 3312 extends in a direction away from the second cylinder 34.

[0049] Reference Figure 7 and Figure 8 , one end of the cylindrical cam 33 is fixedly connected to the mounting flange 32, and the other end is provided with a linear bearing 37. The side of the mounting flange 32 away from the cylindrical cam 33 is fixedly connected to the second cylinder 34, the piston rod of the second cylinder 34 passes through the mounting flange 32 and extends into the cylindrical cam 33, and passes through the linear bearing 37, the piston rod of the second cylinder 34 cooperates with the linear bearing 37, the piston rod of the second cylinder 34 is fixedly connected to the shuttle grabbing arm 22 of the shuttle grabbing mechanism 2, the shuttle grabbing arm 22 is sleeved with a needle bearing 38, and the needle bearing 38 is slidably matched with the circumferential curve groove 331 of the cylindrical cam 33. The third cylinder 31 is fixedly connected to the bottom of the base 1, and the central part of the piston rod of the third cylinder 31 is fixedly connected to the mounting flange 32.

[0050] Reference Figure 1 , 2 and Fig. 9 A feeding assembly 4 is installed on the base 1. The feeding assembly 4 includes a fourth driving assembly, a rotating disk 42 and a positioning column 43. The fourth driving assembly is a driving motor 41. The output shaft of the driving motor 41 is fixedly connected to the rotating disk 42. The rotating disk 42 is fixedly connected to a plurality of positioning columns 43 for clamping a new bottom thread box 001. The plurality of positioning columns 43 are evenly distributed in a ring shape with the center of the rotating disk 42 as the center. A new bottom thread box 001 filled with bottom threads is clamped on each positioning column 43. Each time the rotating disk 42 rotates a certain angle, a new bottom thread box 001 is progressively advanced.

[0051] Reference Figure 3 , Figure 8 and Fig. 9 One end of the shuttle grabbing arm 22 is inserted into the circular curved groove 331 and fixedly connected to the piston rod of the second cylinder 34. The shuttle grabbing mechanism 2 moves longitudinally and reciprocates along with the movement of the piston rod of the second cylinder 34. At the same time, it swings back and forth 90 degrees in a circle. When the shuttle grabbing arm 22 is located in the first groove 3311, the shuttle grabbing hook 23 faces the rotating disk 42; when the shuttle grabbing arm 22 is located in the second groove 3312, the shuttle grabbing hook 23 faces the rotating shuttle 03 on the sewing machine 02 body.

[0052] Reference Figure 2 , Figure 3 and Fig.10The sewing machine 02 is provided with a recycling assembly 5, which includes a material receiving hose 51, a support plate 53 and a bottom thread box 001 recycling box. The sewing machine 02 is provided with a material receiving hose 51, one end of which is opened vertically upward, and the other end is connected to the bottom thread box 001 recycling box. When the shuttle grabbing arm 22 moves into the first groove 3311 and is close to one end of the second cylinder 34, the old bottom thread box 001 clamped by the shuttle grabbing hook 23 and the shuttle taking seat 24 is located directly above the upper end of the opening of the material receiving hose 51. The material receiving hose 51 is tilted downward in the direction close to the bottom thread box 001 recycling box, and the sewing machine 02 is fixedly connected with a support plate 53 for supporting the bottom thread box 001 recycling box. A special winding device 6 for winding the bobbin 04 that has run out of bottom thread is provided in the bottom thread box 001 recycling box.

[0053] Reference Figure 1 , Figure 2 and Fig.11 The special bobbin winder 6 includes a bobbin 61 wound with raw material bobbin thread, a thread passing post 62, a thread clamp 63, a thermal fuse 64, a stepper motor 65 and a clamping post 66 for clamping with the old bobbin core 04. The bobbin 61 is fixedly connected to the recovery box of the bobbin case 001, and the thread passing post 62 is vertically arranged on the recovery box of the bobbin case 001. A plurality of thread passing holes 621 are provided on the thread passing post 62. The thermal fuse 64 and the thread clamp 63 are both arranged on the recovery box of the bobbin case 001. The thread clamp 63 can play a role in adjusting the tightness of the bobbin thread. The stepper motor 65 is vertically arranged in the recovery box of the bobbin case 001. The motor shaft of the stepper motor 65 is coaxial and fixedly connected to the clamping post 66. The stepper motor 65 is electrically connected to a control system. The control system can accurately calculate and control the winding length of the bobbin thread.

[0054] The implementation principle of the automatic bottom thread changing device of a sewing machine 02 in the embodiment of the present application is as follows:

[0055] In the first stage, the sewing machine 02 calculates the time to change the bottom line according to the set bottom line length and gives a signal to change the bottom line. After receiving the signal, the device starts the second cylinder 34, which drives the shuttle grabbing arm 22 to move in the circular curve groove 331, and the needle bearing 38 slides with the circular curve groove 331. When the shuttle grabbing arm 22 moves to the second groove 3312 close to one end of the rotary shuttle 03, the shuttle grabbing mechanism 2 is at a certain distance in front of the rotary shuttle 03; then the third cylinder 31 is started, and the shuttle grabbing mechanism 2 moves linearly to the rotary shuttle 03; then the first cylinder 21 is started, and the piston rod of the first cylinder 21 drives the shuttle grabbing hook 23 to move away from the cylinder body of the first cylinder 21, so that the hook tip of the shuttle grabbing hook 23 moves to the outside of the tail hook 014 of the sliding plate 013, and at this time, the old bottom line shell of the rotary shuttle 03 that has run out of the bottom line is located between the shuttle grabbing hook 23 and the shuttle taking seat 24. Then, the first cylinder 21 moves in the reverse direction, and the first cylinder 21 drives the hook 23 to move toward the center of the bobbin case 01 body. The hook tip 232 contacts the bolt piece 012, forcing the suspended end of the bolt piece 012 to open outward, while opening, it contacts and slides with the transition part 233, until the bolt piece 012 opens to about 55 degrees, the square hole 0121 edge of the bolt piece 012 contacts the inclined surface of the clamping part 234, and the outer side of the bolt piece 012 is close to the shuttle seat 24, and the bottom thread box 001 is firmly clamped by the hook 23 and the shuttle seat 24. At this time, the tail hook 014 clamps the outer edge of the bobbin core 04 to prevent the bobbin core 04 from separating from the bobbin case 01; at the same time, the circular clamping hole 06 and the cylindrical 08 clamping groove 07 are separated, and the bottom thread box 001 and the rotary hook are released. Then the third cylinder 31 moves in the reverse direction, and the bottom thread shell is taken out of the rotary hook 03.

[0056] Next, the second cylinder 34 moves in the reverse direction, and the piston rod of the second cylinder 34 drives the shuttle grabbing arm 22 to pass through the second groove 3312, the transition groove 3313 and the first groove 3311 in sequence. When the shuttle grabbing arm 22 moves to the end of the first groove 3311 close to the second cylinder 34, the shuttle grabbing mechanism 2 is at the initial position of material discharge, and the old bottom line box 001 at the initial position of material discharge is located directly above the upward opening of the receiving hose 51;

[0057] Then the first cylinder 21 drives the shuttle hook 23 to move away from the shuttle seat 24, and the clamping force between the shuttle hook 23 and the shuttle seat 24 disappears, and the old bottom thread box 001 falls into the material receiving hose 51 and falls into the bottom thread box 001 recovery box along the material receiving hose 51.

[0058] In the second stage, the third cylinder 31 moves toward the direction approaching the rotary shuttle 03, and the actuator 3 brings the shuttle grabbing mechanism 2 closer to the turntable 42. At this time, the new bottom thread shell on the turntable 42 is located between the shuttle grabbing hook 23 and the shuttle taking seat 24. The first cylinder 21 drives the shuttle grabbing hook 23 to move toward the shuttle taking seat 24 to clamp the new bottom thread shell; then the third cylinder 31 moves away from the rotary shuttle 03, and the new bottom thread box 001 leaves the turntable 42.

[0059] In the third stage, the second cylinder 34 moves toward the rotary shuttle 03, and the shuttle grabbing mechanism 2 moves along the circular curve groove 331 to the front of the rotary shuttle 03; the third cylinder 31 then moves toward the rotary shuttle 03, and the new bottom thread box 001 enters the rotary shuttle 03, and then the first cylinder 21 moves away from the shuttle taking seat 24, and the new bottom thread box 001 is placed in the rotary shuttle 03. The bolt piece 012 is pressed against the sliding piece 013 under the action of the spring, and the sliding piece 013 slides away from the center of the shuttle case 01, and the circular clamping hole 06 clamps the clamping slot 07 on the cylinder 08, the new bottom thread box 001 is locked, and the sewing machine 02 starts to continue working.

[0060] In the fourth stage, the driving motor 41 drives the turntable 42 to rotate a fixed angle, so that the new bottom thread box 001 rotates to the position of the removed bottom thread shell, and the vacated positioning column 43 position needs to be manually added with the bottom thread box 001 wound with the bottom thread.

[0061] In the fifth stage, after the old bobbin case 001 enters the bobbin case 001 recovery box, the operator takes the bobbin 04 out of the bobbin case 01 and clamps it on the clamping column 66, then passes one end of the raw bobbin on the bobbin reel 61 through the thread hole 621 on the thread column 62, then passes through the hot clamp 63 and the thermal fuse 64, and finally winds it on the bobbin 04. Then, the control system starts the stepper motor 65, and sets the number of revolutions of the motor shaft of the stepper motor 65 according to the length of the bobbin 04 that can be wound. When the number of revolutions of the stepper motor 65 reaches the threshold, the control system turns off the stepper motor 65, and then starts the thermal fuse 64 to fuse the bobbin, thereby achieving accurate winding of the length of the bobbin on the bobbin 04. After that, the operator clamps the wound bobbin 04 into the bobbin case 01 to form a new bobbin case 001, and then clamps the new bobbin case 001 on the turntable 42, waiting for the next replacement of the bobbin case 001.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An automatic thread changing device for a sewing machine, comprising a base (1), characterized in that: The base (1) is provided with a shuttle grabbing mechanism (2) for grabbing the bottom thread box (001), and the base (1) is provided with an actuator (3) for driving the shuttle grabbing mechanism (2) to approach or move away from the sewing machine (02). The shuttle grabbing mechanism (2) comprises a shuttle grabbing arm (22), a shuttle grabbing hook (23), a shuttle taking seat (24), and a first driving component for driving the shuttle grabbing hook (23) to move in a direction approaching the shuttle taking seat (24) or away from the shuttle taking seat (24). One end of the shuttle grabbing arm (22) is connected to the first driving component, and the other end is fixedly connected to the actuator (3). When the first driving component drives the shuttle grabbing hook (23) to move in a direction approaching the shuttle taking seat (24), the shuttle grabbing hook (23) moves from the bolt plate (012) and the sliding plate (013). The bolt plate (012) is inserted between the two ends of the shuttle (013), forcing the bolt plate (012) to open outward by 55 degrees, driving the sliding plate (013) to move toward the center of the shuttle housing (01), and the shuttle hook (23) is inserted into the square hole (0121) and cooperates with the inclined surface of the shuttle seat (24) to clamp the bolt plate (012); the circular clamping hole (06) on the sliding plate (013) is disengaged from the cylindrical clamping groove (07) on the rotary shuttle (03), so that the bottom line box (001) can be separated from the rotary shuttle (03); at the same time, the tail hook (014) on the sliding plate (013) clamps the outer edge of the shuttle core (04), so that the shuttle core (04) will not slip out of the shuttle housing (01), and the base (1) is rotatably connected with a turntable (42), and a plurality of new bottom line boxes (001) are arranged on the turntable (42), and the base (1) is provided with a drive for driving the turntable (42). The fourth driving assembly (22) is rotatable, the actuator (3) comprising a third driving assembly, a mounting flange (32), a second driving assembly and a cylindrical cam (33), one end of the second driving assembly is provided with a mounting flange (32) and a cylindrical cam (33), a side wall of the cylindrical cam (33) is provided with a circular curve groove (331), one end of the shuttle grabbing arm (22) is inserted into the circular curve groove (331) and is fixedly connected to the driving end of the second driving assembly, the circular curve groove (331) comprises a first groove (3311), a second groove (3312) and a transition groove (3313 ), the first groove (3311) and the second groove (3312) are both arranged along the length direction of the cylindrical cam (33); one end of the transition groove (3313) is connected to the first groove (3311), and the other end is connected to the second groove (3312); the first groove (3311) extends in a direction close to the second driving assembly; the second groove (3312) extends in a direction away from the second driving assembly (34); when the shuttle grabbing arm (22) is located in the first groove (3311), the shuttle grabbing hook (23) is arranged toward the rotating disk (42);When the shuttle grabbing arm (22) is located in the second groove (3312), the shuttle grabbing hook (23) is arranged toward the rotary shuttle (03) on the sewing machine (02), the third driving assembly (31) is arranged below the base (1), the central axis of the driving end of the third driving assembly is connected to the mounting flange (32), the second driving assembly and the cylindrical cam (33) are respectively arranged on both sides of the mounting flange (32), the central axis of the second driving assembly passes through the mounting flange (32) and extends into the cylindrical cam (33), and the cylindrical cam (33) is away from A linear bearing (37) is provided at one end of the mounting flange (32), the central axis of the second driving assembly passes through the linear bearing (37), a needle bearing (38) is sleeved on the shuttle grabbing arm (22), the needle bearing (38) is slidably matched with the circular curve groove (331), a slider (35) is provided above the base (1), a slide rail (36) is provided on the side wall of the cylindrical cam (33), the slide rail (36) and the slider (35) are located between the cylindrical cam (33) and the base (1), and the slider (35) is slidably matched with the slide rail (36). ; 2. The automatic thread changing device for a sewing machine according to claim 1, characterized in that: The sewing machine (02) is provided with a material receiving hose (51), one end of which is opened upward, and the other end is connected to a bobbin case recovery box (52). When the shuttle grabbing arm (22) moves to one end of the first groove (3311) close to the second driving assembly, the old bobbin case (001) clamped by the shuttle grabbing mechanism (2) is located directly above the end of the material receiving hose (51) which is opened upward. The material receiving hose (51) is tilted downward in a direction close to the bobbin case recovery box (52). A special bobbin winder (6) for winding the bobbin (04) which has used up the bobbin case is provided above the bobbin case recovery box (52).

3. The automatic thread changing device for a sewing machine according to claim 2, characterized in that: The special bobbin winder (6) comprises a bobbin (61) wound with a raw material bobbin thread, a thread passing post (62), a thread clamp (63), a thermal fuse (64), a stepping motor (65) and a clamping post (66) for clamping with a bobbin (04), wherein the bobbin (61) is fixedly connected to the bobbin thread box (52), the thread passing post (62) is vertically arranged on the bobbin thread box (52), a plurality of thread passing holes (621) are opened on the thread passing post (62), the thread clamp (63) and the thermal fuse (64) are both arranged on the bobbin thread box (52), the stepping motor (65) is arranged in the bobbin thread box (52), the motor shaft of the stepping motor (65) is coaxial and fixedly connected to the clamping post (66), and the stepping motor (65) is electrically connected to a control system.

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