CN213172901U - Guide and thread blowing structure in automatic threading device of sewing machine - Google Patents

Abstract

The utility model provides a direction and blow line structure among automatic threading device of sewing machine belongs to sewing machine technical field. The automatic threading device solves the technical problems of low threading automation degree and the like of the sewing machine. The sewing machine comprises a needle, wherein the needle is provided with a threading hole; the guide and blowing line structure comprises a rotary connecting rod capable of swinging and a driving piece for driving the rotary connecting rod to swing; one end of the rotating connecting rod is fixedly provided with a thread clamping cylinder, the outer end of an output shaft of the thread clamping cylinder is fixedly provided with a thread clamping plate, the thread clamping plate can swing to one side of a threading hole of the needle along with the rotating connecting rod, one end of the thread clamping plate is provided with an open slot, and one end, close to the output shaft, of a shell of the thread clamping cylinder is fixedly provided with an air blowing nozzle facing the open slot. The utility model provides a direction need not other auxiliary structure and artifical supplementary action with blowing during the line structure action, degree of automation is higher, moves accurate reliable, efficient.

Description

Guide and thread blowing structure in automatic threading device of sewing machine

Technical Field

The utility model belongs to the technical field of sewing machine, a direction and blow line structure among automatic threading device of sewing machine, especially an automatic threading device of 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; most do not set up automatic threading device on present sewing machine, all need manual threading under the condition such as take place broken string, broken needle, waste time and energy, especially cause very big puzzlement to the not good people of eyesight or old person.

At present, automatic threading devices are also provided on a small part of household sewing machines, for example, on some flat sewing machines, the automatic threading devices on such sewing machines 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.

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 above patent document still needs to put the thread into the thread hooking groove by hand to successfully complete the threading operation, and the degree of automation is low.

Disclosure of Invention

The utility model discloses to the above-mentioned problem that prior art exists, provide a direction and blow the line structure among the automatic threading device of sewing machine, the utility model discloses the technical problem that will solve is: how to improve the automation degree of the automatic threading device of the sewing machine and smoothly and efficiently pass a thread through a threading hole of a needle.

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

a guide and thread blowing structure in an automatic threading device of a sewing machine comprises a needle, wherein the needle is provided with a threading hole; the wire guiding and blowing structure is characterized by comprising a rotary connecting rod capable of swinging and a driving piece for driving the rotary connecting rod to swing; the one end of rotation connecting rod has set firmly the thread clamping cylinder, the output shaft of thread clamping cylinder has set firmly on the outer end the thread clamping board just the thread clamping board can follow the rotation connecting rod swings extremely the through wires hole one side of eedle, the one end of thread clamping board has the open slot, the one end that is close to its output shaft on the casing of thread clamping cylinder has set firmly the orientation the blowing mouth of open slot.

The working principle is as follows: the sewing machine also comprises a machine shell, a bottom plate, a side cover and a thread take-up lever, wherein the side cover and the thread take-up lever are fixedly arranged at one end of the machine shell; 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. A broken thread detection structure is arranged on the outer side surface of the shell between the take-up lever and the needle; the outer side surface of the machine shell is fixedly provided with a thread clamping structure for clamping and cutting threads, and the lower side of the machine shell is also provided with a thread drawing structure capable of hooking and drawing threads passing through a threading hole of a machine needle; this direction and blow line structure setting are on the side cover. In the technical scheme, the sewing thread passes through the thread breakage detection structure, the thread take-up lever, the guide and blowing thread structure and the thread clamping structure and then penetrates into the threading hole of the machine needle, the thread clamping structure is in a loosening state in the normal working process of the sewing machine, and the sewing thread 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 starts and clamps the suture, and the thread clamping structure can cut off the thread end outside the thread clamping structure to keep the thread end of the suture flat; after the suture is cliied to the thread clamping structure, the suture is cliied together with the thread clamping board to the motion of thread clamping cylinder, the driving piece can drive the one side of rotating the connecting rod swing to the through wires hole on the eedle, the through wires hole of eedle is blown through the suture to the blowing nozzle, then the motion of taking out the line structure, continue to pull out the suture, just so realized sewing machine's automatic threading function, this direction with blow the line structure and need not other auxiliary structure and artifical supplementary action when moving, degree of automation is higher, move accurate reliable, high efficiency.

In the guide and thread blowing structure in the automatic threading device of the sewing machine, one end of the transmission crank is connected with the other end of the rotating connecting rod through the transmission connecting rod; a vertical guide sleeve is fixedly arranged on a side cover of the sewing machine, and a rotating shaft is inserted in the guide sleeve in a sliding manner; the upper end of the rotating shaft is connected with the other end of the transmission crank, and the transmission crank can drive the rotating shaft to axially move and rotate; the lower extreme of pivot has set firmly the swing arm, seted up the orientation on the swing arm the through wires hole and with eedle assorted draw-in groove, still seted up on the swing arm with the draw-in groove is linked together and just right the guiding hole of through wires hole, work as the thread clamp is along with the rotation connecting rod swings to when the through wires hole one side of eedle, the swing arm swing extremely the thread clamp with between the eedle.

In the guide and thread blowing structure in the automatic threading device of the sewing machine, the driving piece is a rotary cylinder or a driving motor; the transmission crank extends along the radial direction of the output shaft of the driving part, and the middle part of the transmission crank is fixedly arranged on the output shaft of the driving part; the other end of the transmission crank is provided with a waist-shaped hole along the length direction of the transmission crank, the upper end of the rotating shaft is sleeved with a bearing which is horizontally arranged, the inner ring of the bearing is fixedly connected with the rotating shaft, the outer ring of the bearing is fixedly connected with a pin, and the outer end of the pin is movably inserted in the waist-shaped hole.

In the direction and the line blowing structure in foretell automatic threading device of sewing machine, the uide bushing is cylindricly, the lower extreme both sides of uide bushing set firmly on the side cover, the upper and lower both ends of pivot all stretch out outside the uide bushing, the bar hole has been seted up on the outer peripheral face of uide bushing, the bar hole includes vertical straight section and edge the decurrent ring segment of circumference slope of uide bushing, the lower extreme of straight section with the upper end of ring segment is arc smooth transition and links to each other, the uide pin has set firmly on the outer peripheral face of pivot, the uide pin activity is inserted and is established in the bar hole.

When the thread clamping structure clamps the thread, the thread clamping cylinder acts to drive the thread clamping plate to move, the thread clamping plate moves towards the shell of the thread clamping cylinder, the thread is clamped under the combined action of the thread clamping cylinder and the thread clamping structure, the thread is loosened by the thread clamping structure, then the driving piece drives the transmission crank to swing, the transmission crank drives the transmission connecting rod to rotate, the transmission connecting rod drives the rotation connecting rod arranged on the connecting rod supporting column to rotate, the rotation connecting rod drives the thread clamping cylinder body arranged on the rotation connecting rod supporting column to rotate, and therefore the thread is driven to rotate to the corresponding position of one side of the thread hole. Meanwhile, when the driving piece drives the transmission crank to swing, the transmission crank drives the pin arranged in the waist-shaped hole to move, the pin drives the sleeve to move up and down on the bearing at the upper end of the rotating shaft, and then the rotating shaft is driven to move axially along the guide sleeve, after the rotating shaft moves downwards to a certain distance, the guide pin arranged on the rotating shaft moves along a given route of the strip-shaped hole in the guide sleeve, so that the rotating shaft is driven to rotate under the matching of the bearing, the swing arm is driven to rotate to a certain position, the guide hole in the swing arm is assisted by the clamping groove in the swing arm to align with the threading hole of the machine needle, and the suture. The swing arm and the thread clamping cylinder synchronously reach the designated position corresponding to the needle under the action of the driving piece, at the moment, the thread clamping cylinder drives the thread clamping plate to move outwards by a small amount to loosen the thread, the air blowing nozzle blows air to keep the thread moving in the designated direction, and the thread is blown into the thread through hole of the needle through the guide hole. When the suture enters the threading hole, the suture is drawn out for a certain distance through the thread drawing structure.

In the direction among the automatic threading device of foretell sewing machine and the line blowing structure, the swing arm is bar platelike, a pot head of swing arm is established the lower extreme of pivot and both link firmly mutually through locking screw, the draw-in groove is located the other end of swing arm, the draw-in groove is vertical V type groove or circular arc groove, run through at the upper and lower both ends of draw-in groove the upper and lower both sides of swing arm, the guiding hole runs through the left and right sides of swing arm. The guide hole of being convenient for like this just sets up with the through wires hole of eedle, guarantees accurate reliability and the high efficiency of automatic threading.

In the guiding and thread blowing structure in the automatic thread threading device of the sewing machine, further, a bending part which is bent towards one side far away from the needle bar is arranged at the end part of the swing arm, the bending part is connected with the body of the swing arm in an arc smooth transition way, the clamping groove and the guiding hole are both positioned on the bending part, and the guiding hole is positioned in the middle of the bending part; one end of the guide hole, which faces the clamping plate, is a port in a trumpet expansion shape; the inner diameter of the guide hole is gradually reduced from the end to the other end of the clamping groove. The guide effect is played to the suture like this, improves the efficiency of precision and automatic threading.

In the guiding and thread blowing structure in the automatic thread threading device of the sewing machine, the driving part is fixedly arranged on the inner wall of the side cover, one end of the transmission connecting rod is hinged with the end part of the transmission crank, the other end of the transmission connecting rod is hinged with one end of the rotating connecting rod, which is far away from the thread clamping cylinder, a connecting rod support is arranged in the middle of one side of the rotating connecting rod or close to the position connected with the transmission connecting rod, and the end part of the connecting rod support is positioned on the inner wall of the side cover; the rotating connecting rod is rotatably connected with the connecting rod support. The driving piece provides power for rotating the connecting rod swing, drives the motion of transmission connecting rod through the driving piece, and then drives and rotates the connecting rod and swing round the connecting rod pillar, rotates the double-layered line cylinder on the connecting rod and double-layered line board can swing to the through wires hole one side of eedle to realize the automatic threading function of suture.

In direction and the line blowing structure among foretell automatic threading device of sewing machine, it is rectangular platelike to rotate the connecting rod, the double-layered line cylinder is worn to the opposite side from one side of rotating the connecting rod, the casing tip of double-layered line cylinder has the backup plate of supporting, support the backup plate with the double-layered line board sets up relatively, the piston rod of double-layered line cylinder can drive the double-layered line board orientation and support to move and centre gripping double-layered line board and support to support the suture between the two of board by the board direction, the blowing nozzle sets firmly support on the backup plate.

In the direction among the automatic threading device of foretell sewing machine and blow line structure, the axial of double-acting thread cylinder with the length direction of rotation link is mutually perpendicular, the double-acting thread cylinder is double-acting cylinder, have on the side of backing plate outer end and can stretch into the limiting plate of open slot. The thread is supported by the limiting plate, so that the thread can smoothly pass through the open slot and then enter the threading hole of the needle.

Compared with the prior art, the utility model provides a direction need not other auxiliary structure and artifical supplementary action with blowing during the line structure action, and degree of automation is higher, moves accurate reliable, and is efficient.

Drawings

FIG. 1 is a schematic view of the mounting structure of the present guide and blow line structure.

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 of the automatic threading device of the sewing machine.

Fig. 4 is a schematic perspective view of a thread clamping structure in an automatic threading device of a sewing machine.

FIG. 5 is a first schematic view of an explosion structure of a thread clamping structure in an automatic threading device of a sewing machine.

FIG. 6 is a second schematic diagram of the explosion structure of the thread clamping structure in the automatic threading device of the sewing machine.

FIG. 7 is a first perspective view of the present guide and wire blowing structure.

FIG. 8 is a perspective view of the present guide and wire blowing structure.

FIG. 9 is a first perspective view of a thread take-up structure of the automatic threading device of the sewing machine.

FIG. 10 is a schematic perspective view of a thread take-up structure in the automatic threading device of the sewing machine.

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; 61a, an extension part I; 61b, a groove; 61c, a first mounting groove; 62. a wire clamping end cover; 62a and an extension part II; 62b, a bump; 62c, a second mounting groove; 62d, concave protrusions; 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. swinging arms; 74a, a card slot; 74b, a guide hole; 74c, a bent portion; 75. a wire clamping plate; 75a, an open slot; 76. a guide sleeve; 76a, strip-shaped holes; 76a1, straight strip section; 76a2, annular segment; 77. a transmission connecting rod; 78. a drive crank; 78a, a kidney-shaped hole; 79. a connecting rod strut; 7a, a support plate; 7a1 and a limiting plate; 7b, a rotating shaft; 7b1, guide pin; 7c, a blowing nozzle; 7d, a bearing; 7d1, pin; 8. a wire drawing structure; 81. a wire drawing connecting rod; 81a, a thread drawing hook; 81b, a first protruding connecting part; 82. a wire clamping supporting plate; 82a and a second protruding connecting part; 82b, an inclined guide part; 82c, a cut; 83. a wire drawing motor; 83a, a motor crank; 84. a motor bracket; 85. a guide plate; 85a, a guide groove; 85b, side plates; 85c, a yielding strip-shaped groove I; 85d, a abdicating bar-shaped groove II; 86. a first transmission rod; 87. a second transmission rod; 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 sewing machine includes a machine shell 1, a bottom plate 10, a side cover 2 fixedly arranged at one end of the machine shell 1, a thread take-up lever 3 and a machine needle 4, wherein the machine needle 4 is provided with a thread hole 41, the machine shell 1 is fixedly arranged on the bottom plate 10, the inner end of the thread take-up lever 3 is positioned in the machine shell 1 and is connected with a main shaft of the sewing machine, and the outer end of the thread take-up lever 3 extends out of the machine shell 1 and can swing under the driving of the main shaft; a needle rod 11 capable of lifting is vertically arranged in the machine shell 1, and a machine needle 4 is fixedly arranged at the lower end of the needle rod 11; a broken thread detection structure 5 is arranged on the outer side surface of the machine shell 1 between the take-up lever 3 and the needle 4; a thread clamping structure 6 for clamping and cutting threads is fixedly arranged on the outer side surface of the machine shell 1, and a thread drawing structure 8 capable of hooking and drawing a thread passing through a thread hole 41 of the needle 4 is arranged on the lower side of the machine shell 1; the present guide and blowing line arrangement is provided on the side cover 2. As shown in fig. 7 and 8, the present guide and blowing line structure includes a rotary link 71 capable of swinging and a driving member 72 for driving the rotary link 71 to swing; a transmission crank 78 is fixedly arranged on the output shaft of the driving piece 72; one end of the rotating connecting rod 71 is fixedly provided with a thread clamping cylinder 73, the outer end of an output shaft of the thread clamping cylinder 73 is fixedly provided with a thread clamping plate 75, the thread clamping plate 75 can swing to one side of the thread hole 41 of the needle 4 along with the rotating connecting rod 71, one end of the thread clamping plate 75 is provided with an open slot 75a, and one end, close to the output shaft, of a shell of the thread clamping cylinder 73 is fixedly provided with an air blowing nozzle 7c facing the open slot 75 a.

In the embodiment, the suture passes through the thread breakage detection structure 5, the thread take-up lever 3, the guide and blowing line structure and the thread clamping structure 6 and then penetrates into the threading hole 41 of the needle 4, the thread clamping structure 6 is in a loosening state in the normal working process of the sewing machine, and the suture 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 starts and clamps the thread at the moment, and the thread clamping structure 6 can cut off the thread end outside 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 thread clamping cylinder 73 acts and clamps the thread together with the thread clamping plate 75, the driving piece 72 can drive the rotating connecting rod 71 to swing to one side of the thread hole 41 on the needle 4, the air blowing nozzle 7c blows the thread through the thread hole 41 of the needle 4, then the thread drawing structure 8 acts and continuously draws out the thread, so that the automatic threading function of the sewing machine is realized, other auxiliary structures and auxiliary actions are not needed during automatic threading, the automation degree is high, the action is accurate and reliable, and the working efficiency is high.

Specifically, as shown in fig. 2, 7 and 8, one end of the transmission crank 78 is connected to the other end of the rotation link 71 through the transmission link 77; a vertical guide sleeve 76 is fixedly arranged on the side cover 2, and a rotating shaft 7b is inserted in the guide sleeve 76 in a sliding manner; the upper end of the rotating shaft 7b is connected with the other end of the transmission crank 78, and the transmission crank 78 can drive the rotating shaft 7b to axially move and rotate; the lower end of the rotating shaft 7b is fixedly provided with a swing arm 74, the swing arm 74 is provided with a clamping groove 74a facing the threading hole 41 and matched with the needle 4, the swing arm 74 is further provided with a guide hole 74b communicated with the clamping groove 74a and facing the threading hole 41, and when the thread clamping plate 75 swings to one side of the threading hole 41 of the needle 4 along with the rotating connecting rod 71, the swing arm 74 swings to a position between the thread clamping plate 75 and the needle 4. The driving member 72 in this embodiment is a rotary cylinder or a driving motor; the transmission crank 78 extends along the radial direction of the output shaft of the driving member 72, and the middle part of the transmission crank 78 is fixedly arranged on the output shaft of the driving member 72; the other end of the transmission crank 78 is provided with a waist-shaped hole 78a along the length direction, the upper end of the rotating shaft 7b is sleeved with a horizontally arranged bearing 7d, the inner ring of the bearing 7d is fixedly connected with the rotating shaft 7b, the outer ring of the bearing 7d is fixedly connected with a pin 7d1, and the outer end of the pin 7d1 is movably inserted in the waist-shaped hole 78 a. The guide sleeve 76 is cylindrical, two sides of the lower end of the guide sleeve 76 are fixedly arranged on the side cover 2, the upper end and the lower end of the rotating shaft 7b both extend out of the guide sleeve 76, a strip-shaped hole 76a is formed in the outer peripheral surface of the guide sleeve 76, the strip-shaped hole 76a comprises a vertical straight strip section 76a1 and an annular section 76a2 inclining downwards along the circumferential direction of the guide sleeve 76, the lower end of the straight strip section 76a1 is connected with the upper end of the annular section 76a2 in an arc-shaped smooth transition mode, a guide pin 7b1 is fixedly arranged on the outer peripheral surface of the rotating shaft 7b, and the guide pin 7b1 is movably inserted into the strip-shaped. When the thread clamping structure 6 clamps the thread, the thread clamping cylinder 73 acts to drive the thread clamping plate 75 to move, the thread clamping plate 75 moves towards the shell of the thread clamping cylinder 73, the thread is clamped by the combined action of the two, the thread is loosened by the thread clamping structure 6 at the moment, then the driving piece 72 drives the transmission crank 78 to swing, the transmission crank 78 drives the transmission connecting rod 77 to rotate, the transmission connecting rod 77 drives the rotating connecting rod 71 arranged on the connecting rod support 79 to rotate, the rotating connecting rod 71 drives the thread clamping cylinder 73 arranged on the rotating connecting rod 71 to rotate, and therefore the thread is driven to rotate to the corresponding position on one side of the thread through hole 41 of the needle 4. Meanwhile, when the driving member 72 drives the driving crank 78 to swing, the driving crank 78 drives the pin 7d1 disposed in the waist-shaped hole 78a to move, the pin 7d1 drives the bearing 7d sleeved on the upper end of the rotating shaft 7b to move up and down, and further drives the rotating shaft 7b to move axially along the guide sleeve 76, when the rotating shaft 7b moves downward to a certain distance, the guide pin 7b1 mounted on the rotating shaft 7b moves according to the given route of the strip-shaped hole 76a on the guide sleeve 76, so as to drive the rotating shaft 7b to rotate under the cooperation of the bearing 7d, so that the swing arm 74 rotates to a certain position, and the guide hole 74b on the swing arm 74 is assisted by the clamping groove 74a on the swing arm 74 to align with the threading hole 41 of the needle 4, so that the suture can accurately enter the. The swing arm 74 and the thread clamping cylinder 73 synchronously reach the corresponding designated position of the needle 4 under the action of the driving piece 72, at the moment, the thread clamping cylinder 73 drives the thread clamping plate 75 to move outwards by a small amount to loosen the thread, the air blowing nozzle 7c blows air to keep the thread moving in the designated direction, and the thread is blown into the thread passing hole 41 of the needle 4 through the guide hole 74 b. After the suture enters the threading hole 41, it is withdrawn a distance through the thread withdrawal structure 8.

As shown in fig. 7 and 8, the swing arm 74 is in the shape of a strip plate, a pot head of the swing arm 74 is arranged at the lower end of the rotating shaft 7b and fixedly connected with the lower end of the rotating shaft 7b through a locking screw, the clamping groove 74a is arranged at the other end of the swing arm 74, the clamping groove 74a is a vertical V-shaped groove or an arc-shaped groove, the upper end and the lower end of the clamping groove 74a penetrate through the upper side and the lower side of the swing arm 74, the guide hole 74b penetrates through the left side and the right side of the swing arm 74, the guide hole 74b and the threading hole 41 of the. Furthermore, the end of the swing arm 74 has a bending part 74c bending towards the side away from the needle bar 11, the bending part 74c is connected with the body of the swing arm 74 in an arc-shaped smooth transition manner, the locking groove 74a and the guiding hole 74b are both located on the bending part 74c, and the guiding hole 74b is located at the middle position of the bending part 74 c; a flared end of the guide hole 74b facing the clamp 75; the guide hole 74b has an inner diameter gradually decreasing from the end toward the other end of the catching groove 74 a. The guide effect is played to the suture like this, improves the efficiency of precision and automatic threading. The driving piece 72 is fixedly arranged on the inner wall of the side cover 2, one end of the transmission connecting rod 77 is hinged with the end part of the transmission crank 78, the other end of the transmission connecting rod 77 is hinged with one end, far away from the wire clamping cylinder 73, of the rotating connecting rod 71, 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, and the end part of the connecting rod supporting column 79 is positioned on the inner wall of the side cover 2; the rotating link 71 is rotatably connected to the link support 79. The driving member 72 provides power for the swing of the rotating connecting rod 71, the driving member 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, and the thread clamping cylinder 73 and the thread clamping plate 75 on the rotating connecting rod 71 can swing to one side of the thread through hole 41 of the needle 4, so that the automatic threading function of the thread is realized. In this embodiment, the rotating connecting rod 71 is in a long strip plate shape, the thread clamping cylinder 73 penetrates from one side of the rotating connecting rod 71 to the other side, the end of the housing of the thread clamping cylinder 73 is provided with a support plate 7a, the support plate 7a is opposite to the thread clamping plate 75, the piston rod of the thread clamping cylinder 73 can drive the thread clamping plate 75 to move towards the support plate 7a and clamp a thread between the thread clamping plate 75 and the support plate 7a, and the blowing nozzle 7c is fixedly arranged on the support plate 7 a; the axial direction of the wire clamping cylinder 73 is perpendicular to the length direction of the rotating connecting rod 71, the wire clamping cylinder 73 is a double-acting cylinder, and a limit plate 7a1 capable of extending into the open groove 75a is arranged on the side surface of the outer end of the abutting plate 7 a. The bottom suture is held by the limiting plate 7a1, and the suture is ensured to smoothly pass through the open slot 75a and then enter 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 disposed on an outer side surface of the casing 1, a wire passing hole 9a is formed in a lower end of the wire passing plate 9, the wire breakage detecting structure 5 includes a wire clamping base 51 fixedly disposed on the casing 1, the wire clamping base 51 is located below the wire passing plate 9, a through hole 51a penetrating through upper and lower sides of the wire clamping base 51 is formed in the wire clamping base 51, and a sensor 52 for detecting a wire is disposed 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. Furthermore, two ends of the wire clamping base 51 are fixed on the outer side surface of the machine shell 1 through screws, the 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 sensor 52 in the disconnection detecting structure 5 in the technical scheme can utilize the pressure sensor 52 in the national patent application number CN2017108604130 or the national patent application number CN 2017101117514Z.

Preferably, as shown in fig. 1, the side surface of the casing 1 is provided with an upper wire grip 12 and a lower wire grip 13 at intervals up and down, the wire passing plate 9 and the upper wire grip 12 are fixed on the casing 1 by the same screw, one side of the wire passing plate 9 is provided with a bent flap 9b, the flap 9b is perpendicular to the side surface of the casing 1, and the flap 9b is provided with two wire passing side holes 9b 1; 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. 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. 1, 4 to 6, the wire clamping structure 6 includes a wire clamping housing 61 and a wire clamping end cover 62, the wire clamping housing 61 is fixedly disposed on a side surface of the housing 1, the wire clamping end cover 62 is connected to the wire clamping housing 61 through a shaft screw 63, an outer end of the wire clamping housing 61 and an inner side of the wire clamping end cover 62 are disposed at an interval, a wire clamping shaft 64 is disposed in a middle portion of the wire clamping housing 61, the wire clamping shaft 64 is connected to the wire clamping end cover 62 through a wire clamping core 65, a movable knife 66 is fixedly disposed at a lower end of the wire clamping end cover 62, a fixed knife 67 matched with the movable knife 66 for cutting a wire is disposed on the wire clamping housing 61, and the wire clamping shaft 64 can drive the wire clamping end cover 62 to move along a length direction of the shaft screw 63 to abut against the wire. 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 extension part 61a extending towards one side, one side of the wire clamping end cover 62 is provided with a second extension part 62a corresponding to the first extension part 61a, a groove 61b is formed in the side surface, facing the second extension part 62a, of the first extension part 61a, a convex block 62b facing the groove 61b is arranged on the side surface, facing the first extension part 61a, of the second extension part 62a, the convex block 62b can be embedded into the groove 61b, the fixed knife 67 is fixedly arranged on the lower side of the first extension part 61a and is positioned right below the groove 61b, and the movable knife 66 is fixedly arranged on the lower side of the second extension part 62a and is positioned right below the convex block 62 b; the wire clamping shell 61 and the wire clamping end cover 62 are oppositely arranged at intervals, the wire clamping end cover 62 can move towards the direction of the wire clamping shell 61, and the installation position of the shaft position screw 63 is located between the wire clamping core 65 and the groove 61b and between the shaft position screw 63 and the lug 62 b; the lower side surface of the second extension part 62a is lower than the lower side surface of the first extension part 61a, the lower side surface of the first extension part 61a is provided with a first mounting groove 61c, a fixed cutter 67 is embedded in the first mounting groove 61c, the bottom of the first mounting groove 61c is communicated with the lower side of the groove 61b, the side surface of the fixed cutter 67 facing the second extension part 62a is an inclined surface, and the inclined surface is obliquely downwards arranged from the lower side of the groove 61b to the second extension part 62 a; the lower side surface of the second extension part 62a is provided with a second mounting groove 62c, the movable knife 66 is embedded in the second mounting groove 62c, the upper side surface of the movable knife 66 is flush with or close to the lower side surface of the fixed knife 67, the side surface of the movable knife 66 facing the first extension part 61a is also an inclined surface, and the inclined surface is obliquely upwards arranged from the bottom of the movable knife 66 facing the first extension part 61 a. 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 extending part 62a is higher than the upper side surface of the first extending part 61a, a concave protrusion 62d is arranged on the side surface of the upper side of the second extending part 62a facing the first extending part 61a, and when the wire clamping end cover 62 is abutted to the wire clamping housing 61, the lower side of the concave protrusion 62d is abutted to the upper side surface of the first extending part 61 a; the central depression of the concave projection 62d is located directly above the groove 61b and the projection 62 b. The suture passes through the middle concave part of the concave bulge 62d and is clamped between the groove 61b and the bump 62 b; 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, so that the wire clamping end cover 62 can be reset, and the compression spring is sleeved on the wire clamping core 65.

As shown in fig. 9 and 10, the thread take-up structure 8 includes a thread take-up link 81 and a thread clamping support plate 82, the thread take-up link 81 is located at one side of the needle bar 11 and is obliquely downward facing the needle 4 in the raised state, and a thread take-up hook 81a is provided at a lower end of the thread take-up link 81; the thread drawing connecting rod 81 is positioned at the upper side of the thread clamping supporting plate 82, and the thread drawing structure 8 further comprises a thread drawing motor 83 capable of driving the thread drawing connecting rod 81 and the thread clamping supporting plate 82 to move towards the machine needle 4; the downside of casing 1 sets firmly motor support 84 and deflector 85, the motor 83 of taking out a percentage sets firmly on motor support 84, both link firmly mutually through the screw, deflector 85 inclines towards 4 lower extremes of eedle, it has guide way 85a to open on the deflector 85, the connecting rod 81 of taking out a percentage and the splint 82 of pressing from both sides all slide to inlay and establish in guide way 85a and can follow the length direction reciprocating motion of guide way 85a, the motor 83 of taking out a percentage can drive connecting rod 81 of taking out a percentage and splint 82 and remove. The guide groove 85a on the guide plate 85 has a guiding function and can assist the wire drawing connecting rod 81 and the wire clamping supporting plate 82 to accurately move; a motor crank 83a is fixedly arranged on an output shaft of the wire drawing motor 83, the motor crank 83a is arranged along the radial direction of the output shaft of the wire drawing motor 83, one end of the motor crank 83a is sleeved on the output shaft of the wire drawing motor 83 and fixedly connected with the output shaft of the wire drawing motor 83 through a locking screw, the other end of the motor crank 83a is connected with a wire drawing connecting rod 81 through a first transmission rod 86, and the middle part of the motor crank 83a is connected with a wire clamping supporting plate 82 through a second transmission rod 87. After the suture enters the threading hole 41 of the needle 4, the thread-drawing motor 83 moves to drive the motor crank 83a to rotate, so as to drive the thread-drawing connecting rod 81 and the thread-clamping supporting plate 82 to move along the guide groove 85a through the first transmission rod 86 and the second transmission rod 87 respectively, the thread-drawing hook 81a on the thread-drawing connecting rod 81 preferentially moves to the vicinity of the threading hole 41 of the needle 4 to hook the suture into the thread-drawing hook 81a, and then the thread-drawing hook 81a moves back to meet the thread-clamping supporting plate 82 in the moving process, so as to clamp the suture.

Furthermore, one end of the guide plate 85 is fixedly connected with the machine shell 1, the other end of the guide plate 85 inclines downwards towards the direction of the machine needle 4, two sides of the guide plate 85 are provided with side plates 85b bending downwards, the outer side edges of the two side plates 85b bend towards the opposite direction again to form a guide groove 85a, one side plate 85b is provided with a first abdicating strip-shaped groove 85c along the length direction, the other side plate 85b is provided with a second abdicating strip-shaped groove 85d along the length direction, the middle part of the wire drawing connecting rod 81 is provided with a first protruding connecting part 81b, the first protruding connecting part 81b slides to penetrate through the first abdicating strip-shaped groove 85c, the end part of the first driving rod 86 is hinged with the first protruding connecting part 81b, the middle part of the wire clamping supporting plate 82 is provided with a second protruding connecting part 82a, the second protruding connecting part 82a slides to penetrate through the second abdicating strip-shaped groove 85d, and the end part of the second driving rod 87 is hinged with the second protruding connecting; the lower end of the thread clamping supporting plate 82 is provided with an inclined guide part 82b bent downwards, a notch 82c is formed in the position, close to the inclined guide part 82b, of the lower end of the thread clamping supporting plate 82, the edge of the notch 82c is provided with a blade, and when the thread drawing cutter rod moves relative to the thread clamping supporting plate 82, the thread drawing hook 81a and the blade of the notch 82c can form shearing movement. The thread drawing hook 81a draws the thread outward, and cuts the thread when the thread reaches the cut 82c provided on the thread clamping splint 82 when drawn to a preset length, thereby removing the problem of thread hairiness that may occur during threading.

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 (9)

1. A guide and thread blowing structure in an automatic threading device of a sewing machine comprises a needle (4) and a needle rod (11), wherein the needle (4) is provided with a threading hole (41); the wire guiding and blowing structure is characterized by comprising a rotary connecting rod (71) capable of swinging and a driving piece (72) for driving the rotary connecting rod (71) to swing; the one end of rotation connecting rod (71) has set firmly double-layered line cylinder (73), double-layered line cylinder (73) the output shaft outer end set firmly double-layered line board (75) just double-layered line board (75) can follow rotation connecting rod (71) swing extremely threading hole (41) one side of eedle (4), the one end of double-layered line board (75) has open slot (75a), the one end that is close to its output shaft on the casing of double-layered line cylinder (73) has set firmly the orientation blowing mouth (7c) of open slot (75 a).

2. The thread guiding and blowing structure in an automatic thread threading device of a sewing machine according to claim 1, characterized in that a transmission crank (78) is fixedly arranged on an output shaft of the driving member (72), and one end of the transmission crank (78) is connected with the other end of the rotating connecting rod (71) through a transmission connecting rod (77); the sewing machine further comprises a machine shell (1) and a side cover (2) fixedly arranged at one end of the machine shell (1), wherein a vertical guide sleeve (76) is fixedly arranged on the side cover (2), and a rotating shaft (7b) is inserted in the guide sleeve (76) in a sliding manner; the upper end of the rotating shaft (7b) is connected with the other end of the transmission crank (78), and the transmission crank (78) can drive the rotating shaft (7b) to axially move and rotate; swing arm (74) have been set firmly to the lower extreme of pivot (7b), seted up on swing arm (74) towards through wires hole (41) and with eedle (4) assorted draw-in groove (74a), still seted up on swing arm (74) with draw-in groove (74a) are linked together and just right guide hole (74b) of through wires hole (41), work as thread clamp (75) are followed rotation connecting rod (71) swing extremely during through wires hole (41) one side of eedle (4), swing arm (74) swing extremely thread clamp (75) with between eedle (4).

3. The thread guiding and blowing structure in an automatic thread threading device of a sewing machine according to claim 2, characterized in that the driving member (72) is a rotary cylinder or a driving motor; the transmission crank (78) extends along the radial direction of the output shaft of the driving part (72), and the middle part of the transmission crank (78) is fixedly arranged on the output shaft of the driving part (72); waist type hole (78a) along its length direction is seted up to the other end of transmission crank (78), the upper end cover of pivot (7b) is equipped with bearing (7d) that the level set up, the inner circle of bearing (7d) with pivot (7b) links firmly, pin (7d1) have been linked firmly on the outer lane of bearing (7d), the outer end activity of pin (7d1) is inserted and is established in waist type hole (78 a).

4. The thread guide and blowing structure in an automatic thread threading device of a sewing machine according to claim 3, it is characterized in that the guide sleeve (76) is cylindrical, two sides of the lower end of the guide sleeve (76) are fixedly arranged on the side cover (2), the upper end and the lower end of the rotating shaft (7b) extend out of the guide sleeve (76), the peripheral surface of the guide sleeve (76) is provided with a strip-shaped hole (76a), the strip-shaped hole (76a) comprises a vertical straight strip section (76a1) and an annular section (76a2) which inclines downwards along the circumferential direction of the guide sleeve (76), the lower end of the straight strip section (76a1) is connected with the upper end of the annular section (76a2) in an arc smooth transition way, and a guide pin (7b1) is fixedly arranged on the peripheral surface of the rotating shaft (7b), and the guide pin (7b1) is movably inserted in the strip-shaped hole (76 a).

5. The structure of the guide and wire blowing structure in the automatic threading device of the sewing machine according to claim 4, wherein the swing arm (74) is in a strip plate shape, one end of the swing arm (74) is sleeved at the lower end of the rotating shaft (7b) and the two are fixedly connected through a locking screw, the clamping groove (74a) is positioned at the other end of the swing arm (74), the clamping groove (74a) is a vertical V-shaped groove or an arc-shaped groove, the upper end and the lower end of the clamping groove (74a) penetrate through the upper side and the lower side of the swing arm (74), and the guide hole (74b) penetrates through the left side and the right side of the swing arm (74).

6. The thread guiding and blowing structure of an automatic thread threading device of a sewing machine according to claim 5, characterized in that the end of the swing arm (74) is provided with a bending part (74c) bending to the side far away from the needle bar (11), the bending part (74c) is connected with the body of the swing arm (74) in an arc-shaped smooth transition way, the clamping groove (74a) and the guiding hole (74b) are both positioned on the bending part (74c) and the guiding hole (74b) is positioned at the middle position of the bending part (74 c); one end of the guide hole (74b) facing the clamping plate (75) is a flared port; the inner diameter of the guide hole (74b) is gradually reduced from the end to the other end of the clamping groove (74 a).

7. The thread guiding and blowing structure in an automatic thread threading device of a sewing machine according to claim 5, characterized in that the driving member (72) is fixedly arranged on the inner wall of the side cover (2), one end of the transmission connecting rod (77) is hinged with the end of the transmission crank (78), the other end of the transmission connecting rod (77) is hinged with one end of the rotating connecting rod (71) far away from the thread clamping cylinder (73), a connecting rod support (79) is arranged at the middle part of one side of the rotating connecting rod (71) or near the position connected with the transmission connecting rod (77), and the end of the connecting rod support (79) is positioned on the inner wall of the side cover (2); the rotating connecting rod (71) is rotatably connected with the connecting rod support (79).

8. The thread guiding and blowing structure in the automatic threading device of the sewing machine according to claim 7, characterized in that the rotating link (71) is in the shape of a long plate, the thread clamping cylinder (73) penetrates from one side of the rotating link (71) to the other side, the end of the housing of the thread clamping cylinder (73) is provided with a support plate (7a), the support plate (7a) is arranged opposite to the thread clamping plate (75), the piston rod of the thread clamping cylinder (73) can drive the thread clamping plate (75) to move towards the support plate (7a) and clamp the thread between the thread clamping plate (75) and the support plate (7a), and the blowing nozzle (7c) is fixedly arranged on the support plate (7 a).

9. The thread guiding and blowing structure in an automatic thread threading device of a sewing machine according to claim 8, wherein an axial direction of the thread clamping cylinder (73) is perpendicular to a length direction of the rotation link (71), the thread clamping cylinder (73) is a double-acting cylinder, and a stopper plate (7a1) capable of protruding into the open groove (75a) is provided on a side surface of an outer end of the abutting plate (7 a).

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