CN212611303U

CN212611303U - Threading structure in automatic threading device of industrial sewing machine

Info

Publication number: CN212611303U
Application number: CN202020912922.0U
Authority: CN
Inventors: 张宸; 张永炬; ***
Original assignee: Zhejiang Lover Health Science and Technology Development Co Ltd; Taizhou University
Current assignee: Zhejiang Lover Health Science and Technology Development Co Ltd; Taizhou University
Priority date: 2020-05-26
Filing date: 2020-05-26
Publication date: 2021-02-26
Anticipated expiration: 2030-05-26

Abstract

The utility model provides a threading structure among automatic threading device of industrial sewing machine belongs to sewing machine technical field. It has solved the low technical problem of waiting of current industrial sewing machine threading automation degree. The industrial sewing machine comprises a machine shell and a machine needle, wherein the machine needle is provided with a threading hole, and the threading structure comprises a guide plate and a threading connecting rod arranged on the guide plate in a sliding manner; the guide plate is arranged on one side of the machine needle, one end of the guide plate is fixedly connected with the lower side of the shell, and the other end of the guide plate is obliquely downward and directly faces the machine needle in a rising state; one end of the threading connecting rod facing the needle is fixedly provided with a deformable threading hook which is made of a tough steel wire and is in a diamond shape; the machine shell is also provided with a threading motor which can drive the threading connecting rod to reciprocate on the guide plate along the length direction of the guide plate; the threading motor can drive the threading collude and pass the through wires hole of eedle. The utility model provides a threading structure has improved the degree of automation of current industrial sewing machine threading greatly.

Description

Threading structure in automatic threading device of industrial sewing machine

Technical Field

The utility model belongs to the technical field of the sewing machine, a threading structure among automatic threading device of industrial sewing machine, especially an automatic threading device of industrial sewing machine is related to.

Background

The sewing machine is a machine which uses one or more sewing threads to form one or more stitches on a sewing material so as to interweave or sew one or more layers of the sewing material; the existing industrial sewing machine is not provided with an automatic threading device, needs manual threading under the conditions of thread breakage, needle breakage and the like, wastes time and labor, and particularly causes great trouble to people with poor eyesight or the old.

Some domestic sewing machines are currently provided with automatic threading devices, for example some flat sewing machines, which can be generally divided into two categories: one type of the device is a device with a simpler structure and a lower automation degree, the device needs two hands to be matched during threading, firstly, the thread is hung on the threading device, then, the thread is taken by one hand, the thread is threaded into the thread hook by the movement of the driving device of one hand, only one section of thread enters the needle hole after the threading is completed, the thread needs to be pulled out by the hand, the whole operation is more complicated and consumes a long time, the effect of assisting the threading can be achieved, and the purpose of quick threading cannot be achieved. The other type of the device is a device with high automation degree and a complex structure, the device needs to hang a wire at a specified position firstly, then the device is driven by a single hand, the whole threading process is completed through the interaction of the self structure of the device, the matching of the other hand is not needed, the operation is simple, the time consumption is low, but the full automatic threading cannot be realized.

These automatic threading devices are only suitable for household machines, and compared with industrial flat sewing machines, the two types of sewing machines have larger difference, and are different in threading direction, stability requirements and the like, and the difference between the two types of sewing machines is larger.

Chinese patent (publication number: CN 208486056U; publication date: 2019-02-12) discloses a threading device for a sewing machine, which comprises a fixed base, a steering engine, a gear, a rack and a threading device, wherein the fixed base is fixedly arranged on a presser bar, the fixed base is formed by arranging a steering engine groove and a rack groove on an iron block with an L-shaped cross section, the steering engine groove and the rack groove are mutually vertical in spatial position, the steering engine is fixedly arranged in the steering engine groove, a motor shaft of the steering engine is connected with the gear, the rack is arranged in the rack groove in a matching manner, a toothed part of the rack is upward, the gear is mutually meshed with the rack, one end of the threading device is fixedly arranged on the front end face of the rack, the other end of the threading device is provided with a sensor and a perforating rod, the sensor and the perforating rod are positioned on the front end face of the threading device, the front end of the perforating rod, the position of the perforating rod is opposite to the needle hole on the machine needle.

The threading device for the sewing machine disclosed in the patent document still needs to place a thread into the thread hooking groove by hand, so that the threading action can be successfully completed, the automation degree is low, the threading accuracy is poor, and the efficiency is low.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a threading structure in the automatic threading device of industrial sewing machine, the utility model discloses the technical problem that will solve is: how to improve the automation degree, the high efficiency and the precision of the threading of the industrial sewing machine.

The purpose of the utility model can be realized by the following technical proposal:

a threading structure in an automatic threading device of an industrial sewing machine, the industrial sewing machine comprises a machine shell and a machine needle, the machine needle is provided with a threading hole, and the threading structure is characterized by comprising a guide plate and a threading connecting rod which is arranged on the guide plate in a sliding way; the guide plate is arranged on one side of the machine needle, one end of the guide plate is fixedly connected with the lower side of the shell, and the other end of the guide plate is obliquely downward and directly faces the machine needle in a rising state; one end of the threading connecting rod, which faces the needle, is fixedly provided with a deformable threading hook, the threading hook is made of a tough steel wire and is in a diamond shape; the machine shell is also provided with a threading motor which can drive the threading connecting rod to reciprocate on the guide plate along the length direction of the guide plate; the threading motor can drive the threading colludes and passes the through wires hole of eedle.

The working principle is as follows: the industrial sewing machine also comprises a thread take-up lever, a bottom plate and a side cover fixedly arranged at one end of the machine shell, the machine shell is fixedly arranged on the bottom plate, the inner end of the thread take-up lever is positioned in the machine shell and is connected with the main shaft, and the outer end of the thread take-up lever extends out of the machine shell and can swing under the driving of the main shaft; the vertical needle bar that is equipped with can go up and down in the casing, the eedle sets firmly at the needle bar lower extreme. The automatic threading device of the industrial sewing machine also comprises a guide structure, a broken thread detection structure and a thread clamping structure which are arranged on the outer side surface of the shell, wherein the broken thread detection structure is positioned between the take-up lever and the needle; the wire clamping structure can be used for clamping and cutting wires; the threading structure in the technical scheme and all the parts together realize the automatic threading function of the industrial sewing machine; the threading structure is particularly matched with the guide structure to carry out threading action; the guide structure comprises a rotating connecting rod which is hinged on the inner side of the side cover and can swing and a driving piece which can drive the rotating connecting rod to swing to one side of the threading hole of the needle; one end of the rotating connecting rod is fixedly provided with a wire clamping cylinder and a wire ejecting cylinder, the outer end of an output shaft of the wire clamping cylinder is fixedly provided with a wire clamping plate, the wire clamping plate is provided with an open slot, and an output shaft of the wire ejecting cylinder is fixedly provided with a post rod facing the open slot; the rotary connecting rod and the guide plate are respectively arranged on two sides of the needle, the threading motor can drive the threading hook to penetrate through a threading hole of the needle and enable the threading hook to be located on one side, close to the thread ejecting cylinder, of the needle, and the threading hook returns to the previous position after clamping a thread. Specifically, in the technical scheme, the suture passes through the thread breakage detection structure, the thread take-up lever and the thread clamping structure and then penetrates into the threading hole of the needle, the thread clamping structure is in a loosening state in the normal working process of the industrial sewing machine, and the suture can freely pass through the thread clamping structure and normally feed and move; when the situation of thread breakage of the suture occurs, the suture is changed from a tight state to a loose state, the thread breakage detection structure can obtain a thread breakage signal at the first time through the sensor, the thread clamping structure is started at the moment, the suture is clamped before being separated from the thread clamping structure, and the thread clamping structure can cut off the thread end outside the lower part of the thread clamping structure to keep the thread end of the suture flat; after the thread is clamped by the thread clamping structure, the guide structure and the threading structure start to act to carry out threading, the thread clamping cylinder drives the thread clamping plate to move to clamp the thread between the take-up lever and the thread clamping structure, the driving piece can drive the rotating connecting rod to swing, so that the thread clamping cylinder and the thread ejecting cylinder move to one side of a threading hole in the machine needle and also bring the thread to one side of the threading hole of the machine needle, meanwhile, the threading motor drives the threading connecting rod to move on the guide plate, the threading hook at the end part of the threading connecting rod moves towards the direction of the machine needle, and the threading hook passes through the threading hole of the machine needle after being deformed; then the thread-ejecting cylinder drives the ejector rod to act, the thread is positioned at the end part of the ejector rod, the ejector rod pushes the thread clamping plate out of the open slot of the thread clamping plate and sends the thread clamping plate to the threading hook, the threading hook clamps the thread positioned at one side of the threading hole of the machine needle and exits the threading hole, so that the thread passes through the threading hole of the machine needle to reach the other side of the threading hole, and the automatic threading function of the sewing machine is realized. The automatic threading of suture has been realized to accurate reliable the realization of this threading structure, need not manual unwrapping wire and presss from both sides the line, and degree of automation is high, and is accurate reliable.

In the threading structure of the automatic threading device of the industrial sewing machine, the guide plate is provided with the guide groove along the length direction of the guide plate, the upper end of the threading connecting rod is inserted into the guide groove in a sliding manner and can reciprocate along the length direction of the guide groove, the lower end of the threading connecting rod extends out of the guide groove, and the threading hook is fixedly arranged on the lower end face of the threading connecting rod.

In the threading structure of the automatic threading device of the industrial sewing machine, the casing is fixedly provided with the motor support, the motor support and the guide plate are fixed on the lower side of the casing through screws, and the threading motor is arranged on the motor support and fixedly connected with the motor support through screws. The threading connecting rod is embedded in the guide groove in a sliding manner and driven by the threading motor to reciprocate along the length direction of the guide groove, so that the threading hook at the end part of the threading connecting rod passes through the threading hole of the needle, clamps the suture and then returns, so that the suture passes through the threading hole of the needle smoothly, and the automatic threading function is realized; the guide groove on the guide plate has a guide effect, so that the moving stability and reliability of the threading connecting rod can be ensured, and the threading hook is assisted to accurately penetrate into a threading hole of a needle.

In the threading structure of the automatic threading device of the industrial sewing machine, the output shaft of the threading motor is fixedly provided with the motor crank, and the motor crank is connected with the threading connecting rod through the transmission rod. The inner end of the motor crank is sleeved on an output shaft of the threading motor and fixedly connected with the output shaft through a locking screw, the outer end of the motor crank extends along the radial direction of the output shaft of the threading motor, one end of the transmission rod is hinged with the outer end of the motor crank, and the other end of the transmission rod is hinged with the middle part of the threading connecting rod; furthermore, the middle part of one side of the threading connecting rod is provided with a bent protruding connecting part, and the protruding connecting part is hinged with the end part of the transmission rod through a screw. The threading motor drives the threading connecting rod to reciprocate in the length direction of the guide groove through the motor crank and the transmission rod, so that threading is performed.

In the threading structure in the automatic threading device of foretell industrial sewing machine, the one end of deflector with the casing links firmly, the other end orientation of deflector the eedle direction downward sloping, the both sides of deflector have the curb plate of buckling downwards, and the outside limit of two curb plates is buckled once more to relative direction and is formed the guide way sets up the bar groove of stepping down along its length direction on one of them curb plate, and above-mentioned protruding connecting portion slide and pass the bar groove of stepping down.

In the threading structure in the automatic threading device of the industrial sewing machine, one edge angle of the threading hook is fixedly connected with the end part of the threading connecting rod, the other edge angle opposite to the threading hook is just opposite to the threading hole of the machine needle in a rising state, a first limiting strip and a second limiting strip are fixedly arranged at the upper side of the lower end of the threading connecting rod at intervals, the first limiting strip and the second limiting strip are arranged side by side at intervals, a channel along the length direction of the threading connecting rod is formed between the first limiting strip and the second limiting strip, and the end parts of the first limiting strip and the second limiting strip protrude out of the lower end of the threading connecting rod and respectively face the two sides of the threading connecting rod to incline. The threading hook has a strong contraction function, when the threading hook is close to a machine needle, a sharp corner at one end of the threading hook enters the threading hole, under the constraint of the threading hole, the rhombic structure is extruded and contracted into a shape close to a straight line to penetrate into the machine needle, when the threading hook penetrates out of the threading hole, the threading hook is restored to the rhombic shape, then the ejector rod ejects a suture into the threading hook, the ejector rod contracts, the threading hook is reset under the driving of the threading connecting rod, at the moment, the threading hook deforms to form the threading hole close to the straight line to exit from the machine needle, meanwhile, the clamped suture also passes through the threading hole of the machine needle, the threading hook restores the shape after exiting from the threading hole, and the suture finishes threading action and is separated. In the threading process of the threading hook, the needle is located between the first limiting strip and the second limiting strip, and the first limiting strip and the second limiting strip can protect the threading hook from being interfered by the outside during threading.

In the threading structure in the automatic threading device of the industrial sewing machine, one side of the end part of the lower end of the threading connecting rod is provided with a notch, the other side of the end part of the lower end of the threading connecting rod is provided with a guard plate, a containing groove is formed in one side of the guard plate facing the notch, when the threading hook is fixedly arranged at the end part of the threading connecting rod, the front end of the threading hook extends out of the front end face of the guard plate, one side part of the threading hook is positioned at the notch, and the other side part of. Therefore, the threading hook can effectively protect the threading hook.

Compared with the prior art, the threading structure of the utility model realizes automatic threading of the suture accurately and reliably, does not need manual paying-off and wire clamping, and has high automation degree, accuracy and reliability; the threading hook is of a rhombic retractable structure, can enter the threading hole of the needle through deformation, and brings a suture out of the threading hole of the needle; meanwhile, the needle threading device has a guiding function, can assist the threading hook to accurately penetrate into a threading hole of a needle, and further improves the precision.

Drawings

Fig. 1 is a schematic perspective view of the threading structure in use when the threading structure is installed on an industrial sewing machine.

Fig. 2 is a partially enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a schematic perspective view of a thread breakage detecting structure in an industrial sewing machine.

Fig. 4 is a perspective view of a thread clamping structure in the industrial sewing machine.

Fig. 5 is an exploded view of a thread clamping structure in an industrial sewing machine.

Fig. 6 is a schematic perspective view of a guide structure in an industrial sewing machine.

Fig. 7 is a schematic perspective view of a guide structure in an industrial sewing machine.

FIG. 8 is a schematic view showing the structure of a thread-lifting cylinder in the industrial sewing machine.

Fig. 9 is a first perspective view of the threading structure.

Fig. 10 is a schematic perspective view of the threading structure.

In the figure, 1, a housing; 2. a side cover; 3. a take-up lever; 4. a needle; 41. threading holes; 5. a wire break detection structure; 51. a wire clamping base; 51a, a through hole; 52. a sensor; 6. a wire clamping structure; 61. a wire clamping shell; 62. a wire clamping end cover; 63. an axial screw; 64. a wire clamping shaft; 65. clamping the wire core; 66. moving a knife; 67. fixing a cutter; 71. rotating the connecting rod; 72. a drive member; 73. a wire clamping cylinder; 74. a top line cylinder; 75. a wire clamping plate; 75a, an open slot; 76. a top rod; 76a, a V-shaped groove; 77. a transmission connecting rod; 78. a drive crank; 79. a connecting rod strut; 7a, a support plate; 81. a threading connecting rod; 81a, a male connection portion; 81b, a notch; 81c, a guard plate; 81d, accommodating grooves; 82. threading hook; 83. a threading motor; 83a, a motor crank; 84. a motor bracket; 85. a guide plate; 85a, a guide groove; 85b, side plates; 85c, abdicating the strip-shaped groove; 86. a transmission rod; 87. a first limiting strip; 88. a second limiting strip; 9. a wire passing plate; 9a, a wire through hole; 9b, folding plates; 9b1, cross line side hole; 10. a base plate; 11. a needle bar; 12. mounting a wire holder; 13. and (5) a lower wire clamping device.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the industrial sewing machine in this embodiment includes a housing 1, a bottom plate 10, a side cover 2 fixed at one end of the housing 1, a thread take-up lever 3 and a needle 4, the needle 4 has a thread hole 41, the housing 1 is fixed on the bottom plate 10, an inner end of the thread take-up lever 3 is located in the housing 1 and connected with a main shaft, an outer end of the thread take-up lever 3 extends out of the housing 1 and can swing under the driving of the main shaft, a needle rod 11 capable of lifting is vertically arranged in the housing 1, and the needle 4 is fixed at a lower end of the needle rod 11. The automatic threading device also comprises a guide structure arranged on the side cover 2, and a broken wire detection structure 5 and a wire clamping structure 6 which are arranged on the outer side surface of the machine shell 1, wherein the broken wire detection structure 5 is positioned between the take-up lever 3 and the needle 4; the clamping structure 6 can be used for clamping and cutting threads.

As shown in fig. 9 and 10, the threading structure includes a guide plate 85 and a threading link 81 slidably disposed on the guide plate 85; the guide plate 85 is arranged on one side of the machine needle 4, one end of the guide plate 85 is fixedly connected with the lower side of the machine shell 1, and the other end of the guide plate 85 is obliquely downward and directly opposite to the machine needle 4 in a rising state; a deformable threading hook 82 is fixedly arranged at one end of the threading connecting rod 81 facing the needle 4, the threading hook 82 is made of a tough steel wire, and the threading hook 82 is in a diamond shape; the machine shell 1 is also provided with a threading motor 83 which can drive the threading connecting rod 81 to reciprocate on the guide plate 85 along the length direction; the threading motor 83 can drive the threading hook 82 to pass through the threading hole 41 of the needle 4.

As shown in fig. 1, 6 to 10, the threading structure in the present embodiment, together with all the above components, realizes the automatic threading function of the industrial sewing machine; the threading structure is particularly matched with the guide structure to carry out threading action; the guide structure comprises a rotary connecting rod 71 which is hinged at the inner side of the side cover 2 and can swing, and a driving piece 72 which can drive the rotary connecting rod 71 to swing to one side of the threading hole 41 of the needle 4; one end of the rotating connecting rod 71 is fixedly provided with a wire clamping cylinder 73 and a wire ejecting cylinder 74, the outer end of an output shaft of the wire clamping cylinder 73 is fixedly provided with a wire clamping plate 75, the wire clamping plate 75 is provided with an open slot 75a, and an output shaft of the wire ejecting cylinder 74 is fixedly provided with a mandril 76 facing the open slot 75 a; the rotating connecting rod 71 and the guide plate 85 are respectively arranged at two sides of the needle 4, the threading motor 83 can drive the threading hook 82 to penetrate through the threading hole 41 of the needle 4, the threading hook 82 is positioned at one side of the needle 4 close to the top thread cylinder 74, and the threading hook 82 retracts to the previous position after clamping a thread. Specifically, in the embodiment, the sewing thread passes through the thread breakage detection structure 5, the thread take-up lever 3 and the thread clamping structure 6 and then penetrates into the threading hole 41 of the needle 4, and in the normal working process of the industrial sewing machine, the thread clamping structure 6 is in a loosening state, and the sewing thread can freely pass through the thread clamping structure 6 and normally feed and move; when the thread is broken, the thread is changed from a tight state to a loose state, the thread breakage detection structure 5 can obtain a thread breakage signal at the first time through the sensor 52, the thread clamping structure 6 is started at the moment, the thread is clamped before being separated from the thread clamping structure 6, and the thread clamping structure 6 can cut off the thread end outside the lower part of the thread clamping structure 6 to keep the thread end of the thread smooth; after the thread is clamped by the thread clamping structure 6, the guide structure and the threading structure start to act to thread, the thread clamping cylinder 73 drives the thread clamping plate 75 to move to clamp the thread between the thread taking-up rod 3 and the thread clamping structure 6, the driving piece 72 drives the rotating connecting rod 71 to swing, the thread clamping cylinder 73 and the thread ejecting cylinder 74 are made to move to one side of the threading hole 41 on the needle 4 and also bring the thread to one side of the threading hole 41 of the needle 4, meanwhile, the threading motor 83 drives the threading connecting rod 81 to move on the guide plate 85, the threading hook 82 at the end part of the threading connecting rod 81 moves towards the needle 4, and the threading hook 82 passes through the threading hole 41 of the needle 4 after being deformed; then the thread-ejecting cylinder 74 drives the top bar 76 to move, the thread is positioned at the end part of the top bar 76, the top bar 76 pushes the thread clamping plate 75 out of the opening groove 75a of the thread clamping plate 75 and sends the thread clamping plate 75 to the threading hook 82, the threading hook 82 clamps the thread positioned at one side of the threading hole 41 of the machine needle 4 and exits the threading hole 41, so that the thread passes through the threading hole 41 of the machine needle 4 to the other side, and the automatic threading function of the sewing machine is realized. The automatic threading of suture has been realized to accurate reliable the realization of this threading structure, need not manual unwrapping wire and presss from both sides the line, and degree of automation is high, and is accurate reliable.

Further, as shown in fig. 9 and 10, the guide plate 85 is provided with a guide groove 85a along the length direction thereof, the upper end of the threading link 81 is slidably inserted into the guide groove 85a and can reciprocate along the length direction of the guide groove 85a, the lower end of the threading link 81 extends out of the guide groove 85a, and the threading hook 82 is fixedly arranged on the lower end face of the threading link 81; the machine shell 1 is fixedly provided with a motor support 84, the motor support 84 and the guide plate 85 are fixed on the lower side of the machine shell 1 through screws, and the threading motor 83 is arranged on the motor support 84 and fixedly connected with the motor support 84 through screws. The threading connecting rod 81 is embedded in the guide groove 85a in a sliding manner and driven by the threading motor 83 to reciprocate along the length direction of the guide groove 85a, so that the threading hook 82 at the end part of the threading connecting rod 81 is brought through the threading hole 41 of the needle 4, clamps the thread and then retracts, the thread smoothly passes through the threading hole 41 of the needle 4, and the automatic threading function is realized; the guide groove 85a of the guide plate 85 has a guiding function, so that the moving stability and reliability of the threading connecting rod 81 can be ensured, and the threading hook 82 can be assisted to accurately penetrate into the threading hole 41 of the needle 4.

As shown in fig. 1 and 3, a wire passing plate 9 bent and extending downward is fixedly arranged on the outer side surface of the case 1, a wire passing hole 9a is formed in the lower end of the wire passing plate 9, the wire breakage detection structure 5 includes a wire clamping base 51 fixedly arranged on the case 1, two ends of the wire clamping base 51 are fixed on the outer side surface of the case 1 through screws, a through hole 51a is a rectangular hole, and the through hole 51a is located in the middle of the wire clamping base 51 and penetrates through the upper side and the lower side of the wire clamping base 51; the thread clamping base 51 is positioned below the thread passing plate 9, a through hole 51a penetrating through the upper side and the lower side of the thread clamping base 51 is formed in the thread clamping base 51, and a sensor 52 for detecting a thread is arranged in the through hole 51 a. When the thread penetrating through the through hole 51a of the thread clamping base 51 is broken, the sensor 52 positioned in the through hole 51a detects a thread breaking signal, the sensitivity of the sensor 52 is high, and the signal can be timely transmitted after the thread breaking signal is detected, so that the thread clamping structure 6 can rapidly clamp the broken thread, and the guarantee is provided for the sewing machine to successfully and automatically thread.

The sensor 52 in the disconnection detecting structure 5 of the present embodiment may use the pressure sensor 52 in the chinese patent application No. CN2017108604130 or the chinese patent application No. CN 2017101117514Z.

Further, as shown in fig. 1, an upper wire gripper 12 and a lower wire gripper 13 are arranged at an interval from top to bottom on the side surface of the case 1, the wire passing plate 9 and the upper wire gripper 12 are fixedly arranged on the case 1 by using the same axial screw 63, a folded plate 9b is arranged on one side of the wire passing plate 9, the folded plate 9b is perpendicular to the side surface of the case 1, and two wire passing side holes 9b1 are arranged on the folded plate 9 b; the broken wire detection structure 5 is positioned between the upper wire holder 12 and the lower wire holder 13, the lower end of the wire passing plate 9 extends downwards to the broken wire detection structure 5, the end part of the lower end of the wire passing plate 9 bends downwards in an inclined mode and is tilted, and the wire passing hole 9a is positioned at the end of the wire passing plate 9. When in use, the suture is led out from the reel, passes through the thread-passing side hole 9b1 of the thread-passing plate 9, then bypasses the upper thread clamp 12, passes through the thread-passing hole 9a of the thread-passing plate 9, then passes through the through hole 51a in the thread breakage detection structure 5, then bypasses the lower thread clamp 13, and then passes through the take-up lever 3.

As shown in fig. 4 and 5, the thread clamping structure 6 includes a thread clamping housing 61 and a thread clamping end cover 62, the thread clamping housing 61 is fixedly arranged on the side surface of the machine shell 1, the thread clamping end cover 62 is connected with the thread clamping housing 61 through a shaft position screw 63, the outer end of the thread clamping housing 61 and the inner side of the thread clamping end cover 62 are oppositely arranged at intervals, and the thread clamping end cover 62 can move towards the thread clamping housing 61; the middle part of the wire clamping shell body 61 is provided with a wire clamping shaft 64, the wire clamping shaft 64 is connected with the wire clamping end cover 62 through a wire clamping core 65, the lower end of the wire clamping end cover 62 is fixedly provided with a movable knife 66, the wire clamping shell body 61 is provided with a fixed knife 67 matched with the movable knife 66 for cutting, and the wire clamping shaft 64 can drive the wire clamping end cover 62 to move along the length direction of the shaft position screw 63 until the wire clamping end cover is abutted against the wire clamping shell body 61. After receiving the wire breaking signal, the wire clamping shaft 64 drives the wire clamping end cover 62 to abut against the wire clamping shell 61 under the action of the electromagnet, the wire clamping end cover 62 and the wire clamping shell 61 are matched to clamp the suture, at the moment, the movable knife 66 is connected with the fixed knife 67 to cut the thread end below the wire clamping shell 1, and the thread cutting positions are the same, so that the thread end can be guaranteed to be consistent in length after each threading. Furthermore, the wire clamping shell 61 is cylindrical, the wire clamping end cover 62 is plate-shaped, the outer end of the wire clamping shell 61 is provided with a first extending part extending towards one side, one side of the wire clamping end cover 62 is provided with a second extending part corresponding to the first extending part, a groove is formed in the side surface of the first extending part facing the second extending part, a convex block facing the groove is arranged on the side surface of the second extending part facing the first extending part, the convex block can be embedded into the groove, the fixed knife 67 is fixedly arranged on the lower side of the first extending part and located right below the groove, and the movable knife 66 is fixedly arranged on the lower side of the second extending part and located right below the convex block; the mounting position of the shaft screw 63 is between the clamp core 65 and the groove and cam. When the thread is clipped, the convex block enters the groove, the movable knife 66 fixedly connected with the thread clipping end cover 62 and the fixed knife 67 fixedly connected with the thread clipping shell 61 generate shearing action, partial thread with hair generated by thread breakage at the tail end of the thread is cut off, and the thread ends can be ensured to keep consistent length after each threading because the thread cutting positions are the same. Through the structure, when the thread clamping end cover 62 is separated from the thread clamping shell 61, the thread principle fixed knife 67 and the movable knife 66 are used for suturing, so that the thread is not cut off by the movable knife 66 and the fixed knife 67 in normal work. The lower side surface of the first extension part is lower than that of the second extension part, a first mounting groove is formed in the lower side surface of the first extension part, the fixed cutter 67 is embedded in the first mounting groove, the bottom of the first mounting groove is communicated with the lower side of the groove, the side, facing the second extension part, of the fixed cutter 67 is an inclined surface, and the inclined surface is obliquely and downwards arranged from the lower side of the groove to the second extension part; the second mounting groove is formed in the lower side face of the second extending portion, the moving blade 66 is embedded in the second mounting groove, the upper side face of the moving blade 66 is flush with or close to the lower side face of the fixed blade 67, the side face, facing the first extending portion, of the moving blade 66 is also an inclined face, and the inclined face is formed by the bottom of the moving blade 66 facing the first extending portion in an inclined mode. The intersection of the inclined surface and the lower side surface of the fixed knife 67 forms a cutting edge of the fixed knife 67, the intersection of the inclined surface and the upper side surface of the movable knife 66 forms a cutting edge of the movable knife 66, and when the thread clamping end cover 62 moves towards the thread clamping shell 61, the cutting edge of the movable knife 66 and the cutting edge of the fixed knife 67 form shearing motion, so that redundant threads are sheared, and the thread ends of the threads are guaranteed to be neat and level.

Furthermore, the upper side surface of the second extension part is higher than the upper side surface of the first extension part, a concave bulge is arranged on the side surface of the upper side of the second extension part facing the first extension part, and when the wire clamping end cover 62 is attached to the wire clamping shell 61, the lower side of the concave bulge is attached to the upper side surface of the first extension part; the middle concave part of the concave bulge is just above the groove and the lug. The suture is threaded through the concave raised central depression and is held between the groove and the projection. The wire clamping shell 61 and the wire clamping end cover 62 are coaxially arranged, the wire clamping shaft 64 and the wire clamping shell 61 are coaxially arranged, the wire clamping shaft 64 is movably inserted in the wire clamping shell 61 and can axially move, and the inner end of the wire clamping shaft 64 is connected with an iron core of the electromagnet and can axially move under the driving of the electromagnet; the outer end of the wire clamping shaft 64 is fixedly connected with the wire clamping end cover 62 through the wire clamping core 65, and the wire clamping shaft 64 can drive the wire clamping end cover 62 to move when moving; the inner end of the shaft position screw 63 penetrates through the wire clamping end cover 62 and is screwed on the wire clamping shell 61, and the shaft position screw 63 and the wire clamping shaft 64 are arranged in parallel at intervals, so that the wire clamping end cover 62 can be prevented from rotating in the circumferential direction while moving in the axial direction of the wire clamping shaft 64; thereby preventing misalignment.

Preferably, a compression spring is arranged between the wire clamping shell 61 and the wire clamping end cover 62 in the embodiment, so that the wire clamping end cover 62 can be reset, and preferably, the wire clamping end cover 62 is sleeved on the wire clamping core 65.

As shown in fig. 6 and 7, the driving member 72 is fixedly arranged on the inner wall of the side cover 2, a transmission connecting rod 77 is arranged between the rotating connecting rod 71 and the driving member 72, one end of the transmission connecting rod 77 is connected with the driving member 72 through a transmission crank 78, the inner end of the transmission crank 78 is sleeved on the output shaft of the driving member 72, the outer end extends along the radial direction of the output shaft of the driving member 72 and is hinged with the end part of the transmission connecting rod 77, the other end of the transmission connecting rod 77 is hinged with one end of the rotating connecting rod 71 far away from the wire clamping cylinder 73, a connecting rod supporting column 79 is arranged in the middle of one side of the rotating connecting rod 71 or close to the position connected with the transmission connecting rod 77; the rotating link 71 is rotatably connected to the link support 79. The driving part 72 provides power for the swing of the rotating connecting rod 71, the driving part 72 drives the transmission connecting rod 77 to move, and then the rotating connecting rod 71 is driven to swing around the connecting rod supporting column 79, one end of the rotating connecting rod 71, which is provided with the thread clamping cylinder 73 and the thread ejecting cylinder 74, can swing to one side of the thread penetrating hole 41 of the sewing needle, and therefore the automatic threading function of the sewing thread is achieved. The rotation link 71 is hinged to the inner wall of the side cover 2 through a link post 79, so that the rotation link 71 has good stability when swinging.

The driving member 72 is a cylinder or a motor in this embodiment. The air cylinder can be a rotary air cylinder or a common double-acting air cylinder, the rotary connecting rod 71 is driven to swing through a swing rod or a connecting rod structure, the air cylinder or the motor is common, and the maintenance or the replacement is convenient.

Further, the rotating connecting rod 71 is in a long strip plate shape, the shell of the wire clamping cylinder 73 and the shell of the wire ejecting cylinder 74 are fixedly arranged on the rotating connecting rod 71 at intervals, the wire clamping cylinder 73 and the wire ejecting cylinder 74 penetrate from one side of the rotating connecting rod 71 to the other side, the end portion of the shell of the wire clamping cylinder 73 is provided with a support plate 7a, the support plate 7a is arranged opposite to the wire clamping plate 75, a piston rod of the wire clamping cylinder 73 can drive the wire clamping plate 75 to move towards the support plate 7a and clamp the wire between the wire clamping plate 75 and the support plate 7a, the support plate 7a extends towards one side of the wire ejecting cylinder 74, an opening groove 75a is formed in one side, close to the wire ejecting cylinder 74, of the wire clamping plate 75, and the ejector rod 76 penetrates through the support plate 7a and faces the opening groove 75a and can reciprocate on the support plate 7. Further, the ejector rod 76 may be a part of the piston rod of the ejector wire cylinder 74, or may be a structure that is manufactured separately from the piston rod of the ejector wire cylinder 74 and then fixedly connected together; the thread clamping cylinder 73 is closer to the end of the rotating link 71 than the thread ejecting cylinder 74, the axial direction of the thread clamping cylinder 73 is perpendicular to the longitudinal direction of the rotating link 71, the thread ejecting cylinder 74 is arranged obliquely, and the piston rod of the thread ejecting cylinder 74 is inclined toward the piston rod direction of the thread clamping cylinder 73. The wire clamping cylinder 73 and the wire ejecting cylinder 74 are both fixed on the rotating connecting rod 71 through mounting connecting blocks and screws, the wire clamping cylinder 73 and the wire ejecting cylinder 74 are both double-acting cylinders, and both the wire clamping cylinder 73 and the wire ejecting cylinder 74 are provided with two air throttle valves, so that the wire clamping cylinder 73 and the wire ejecting cylinder 74 can be driven and reset through electric control, and the automation degree of the wire clamping cylinder 73 and the wire ejecting cylinder 74 is improved; as shown in fig. 8, the end of the push rod 76 is provided with a V-shaped groove 76a to prevent the suture from deviating from the end of the push rod 76, so that the action of the push rod cannot be realized.

As shown in fig. 9 and 10, a motor crank 83a is fixed on the output shaft of the threading motor 83, and the motor crank 83a is connected with the threading connecting rod 81 through a transmission rod 86. The inner end of the motor crank 83a is sleeved on the output shaft of the threading motor 83 and is fixedly connected with the output shaft of the threading motor 83 through a locking screw, the outer end of the motor crank 83a extends along the radial direction of the output shaft of the threading motor 83, one end of the transmission rod 86 is hinged with the outer end of the motor crank 83a, and the other end of the transmission rod 86 is hinged with the middle part of the threading connecting rod 81; further, the threading link 81 has a bent protruding coupling part 81a at a middle portion of one side thereof, and the protruding coupling part 81a is hinged to an end of the driving lever 86 by a screw. The threading motor 83 reciprocates the threading link 81 in the longitudinal direction of the guide groove 85a by the motor crank 83a and the transmission lever 86, thereby performing the threading operation. One end and the casing 1 of deflector 85 link firmly, and the other end of deflector 85 is towards 4 direction downward sloping of eedle, and the both sides of deflector 85 have the curb plate 85b of buckling downwards, and the outside limit of two curb plates 85b is buckled once more to relative direction and is formed guide way 85a, offers the bar groove 85c of stepping down along its length direction on one of them curb plate 85b, and above-mentioned bulge connecting portion 81a slides and passes the bar groove 85c of stepping down. One edge angle of the threading hook 82 is fixedly connected with the end part of the threading connecting rod 81, the other edge angle opposite to the threading hook is opposite to the threading hole 41 of the needle 4 in a rising state, a first limit strip 87 and a second limit strip 88 are fixedly arranged on the upper side of the lower end of the threading connecting rod 81 at intervals, the first limit strip 87 and the second limit strip 88 are arranged side by side at intervals, a channel along the length direction of the threading connecting rod 81 is formed between the first limit strip 87 and the second limit strip 88, and the end parts of the first limit strip 87 and the second limit strip 88 protrude out of the lower end of the threading connecting rod 81 and incline towards the two sides of the threading connecting rod 81 respectively. The threading hook 82 has a strong contraction function, when the threading hook is close to the needle 4, a sharp corner at one end of the threading hook enters the threading hole 41, the rhombic structure is extruded and contracted into a shape close to a straight line to penetrate into the needle 4 under the constraint of the threading hole 41, when the threading hook passes through the threading hole 41, the threading hook 82 is restored to the rhombic shape, then the ejector rod 76 ejects a suture into the threading hook 82, the ejector rod 76 contracts, the threading hook 82 is restored under the driving of the threading connecting rod 81, at the moment, the threading hook 82 deforms to form a shape close to the straight line to exit from the threading hole 41 of the needle 4, meanwhile, the clamped suture is also taken through the threading hole 41 of the needle 4, the threading hook 82 restores to the shape after exiting from the threading hole 41, and the threading action of the suture is completed to be separated. In the threading process of the threading hook 82, the needle 4 is positioned between the first limiting strip 87 and the second limiting strip 88, and the first limiting strip 87 and the second limiting strip 88 can protect the threading hook 82 from being interfered by the outside during threading.

Further, as shown in fig. 9, the threading link 81 has a notch 81b on one side of the lower end portion thereof and a protection plate 81c on the other side thereof, the protection plate 81c has a receiving groove 81d on one side thereof facing the notch 81b, when the threading hook 82 is fixed to the end portion of the threading link 81, the front end of the threading hook 82 protrudes out of the front end surface of the protection plate 81c, one side portion of the threading hook 82 is located at the notch 81b, and the other side portion is located in the receiving groove 81 d; this can effectively protect the threading hook 82.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A threading structure in an automatic threading device of an industrial sewing machine, the industrial sewing machine comprises a machine shell (1) and a machine needle (4), the machine needle (4) is provided with a threading hole (41), the threading structure is characterized by comprising a guide plate (85) and a threading connecting rod (81) arranged on the guide plate (85) in a sliding way; the guide plate (85) is arranged on one side of the machine needle (4), one end of the guide plate (85) is fixedly connected with the lower side of the machine shell (1), and the other end of the guide plate (85) is obliquely downward and directly faces the machine needle (4) in a rising state; one end of the threading connecting rod (81) facing the needle (4) is fixedly provided with a deformable threading hook (82), the threading hook (82) is made of a tough steel wire and is in a diamond shape; the machine shell (1) is also provided with a threading motor (83) which can drive the threading connecting rod (81) to reciprocate on the guide plate (85) along the length direction of the guide plate; the threading motor (83) can drive the threading hook (82) to penetrate through the threading hole (41) of the needle (4).

2. The threading structure in the automatic threading device of the industrial sewing machine according to claim 1, wherein the guide plate (85) is provided with a guide groove (85a) along a length direction thereof, an upper end of the threading link (81) is slidably inserted into the guide groove (85a) and can reciprocate along the length direction of the guide groove (85a), a lower end of the threading link (81) protrudes out of the guide groove (85a), and the threading hook (82) is fixedly arranged on a lower end face of the threading link (81).

3. The threading structure of the automatic threading device of the industrial sewing machine according to claim 1 or 2, characterized in that a motor bracket (84) is fixed on the machine shell (1), the motor bracket (84) and the guide plate (85) are fixed on the lower side of the machine shell (1) through screws, the threading motor (83) is arranged on the motor bracket (84) and the threading motor and the motor are fixedly connected through screws.

4. The threading structure of the automatic threading device of the industrial sewing machine according to claim 2, characterized in that a motor crank (83a) is fixedly arranged on an output shaft of the threading motor (83), and the motor crank (83a) is connected with the threading connecting rod (81) through a transmission rod (86); the inner end of the motor crank (83a) is sleeved on an output shaft of the threading motor (83) and fixedly connected with the threading motor through a locking screw, the outer end of the motor crank (83a) radially extends along the output shaft of the threading motor (83), and one end of the transmission rod (86) is hinged with the outer end of the motor crank (83 a).

5. The threading structure in the automatic threading device of the industrial sewing machine according to claim 4, wherein the threading link (81) has a bent protruding link (81a) at a side middle portion, and the protruding link (81a) is hinged with the other end of the transmission lever (86) by a screw.

6. The threading structure of the automatic threading device of the industrial sewing machine according to claim 5, wherein the two sides of the guide plate (85) are provided with side plates (85b) bent downwards, the outer side edges of the two side plates (85b) are bent again in opposite directions to form the guide groove (85a), one side plate (85b) is provided with an abdicating strip-shaped groove (85c) along the length direction thereof, and the protruding connecting part (81a) slides through the abdicating strip-shaped groove (85 c).

7. The threading structure of the automatic threading device of the industrial sewing machine according to claim 6, wherein one corner of the threading hook (82) is fixedly connected with the end of the threading connecting rod (81), the other corner opposite to the threading hook is opposite to the threading hole (41) of the needle (4) in the ascending state, a first limiting strip (87) and a second limiting strip (88) are fixedly arranged on the upper side of the lower end of the threading connecting rod (81) at intervals, the first limiting strip (87) and the second limiting strip (88) are arranged side by side at intervals, a channel along the length direction of the threading connecting rod (81) is formed between the first limiting strip (87) and the second limiting strip (88), and the end parts of the first limiting strip (87) and the second limiting strip (88) protrude out of the lower end of the threading connecting rod (81) and incline towards the two sides of the threading connecting rod (81).

8. The threading structure in an automatic threading device of an industrial sewing machine according to claim 7, wherein the lower end of the threading link (81) has a notch (81b) on one side and a guard plate (81c) on the other side, the guard plate (81c) has a receiving groove (81d) formed on one side facing the notch (81b), when the threading hook (82) is fixed to the end of the threading link (81), the front end of the threading hook (82) protrudes from the front end surface of the guard plate (81c), one side of the threading hook (82) is partially located at the notch (81b) and the other side is partially located in the receiving groove (81 d).