CN109778446B - Bird nest preventing device of sewing machine - Google Patents
Bird nest preventing device of sewing machine Download PDFInfo
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- CN109778446B CN109778446B CN201910132273.4A CN201910132273A CN109778446B CN 109778446 B CN109778446 B CN 109778446B CN 201910132273 A CN201910132273 A CN 201910132273A CN 109778446 B CN109778446 B CN 109778446B
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Abstract
The invention provides a bird nest prevention device for a sewing machine, and belongs to the technical field of sewing machines. The problem that the line sweeping success rate of a line sweeping rod of an existing bird nest prevention device is not high, and therefore the line sucking effect of an air suction pipe is poor is solved. This bird's nest device is prevented to sewing machine includes the fixed block, the driver, the structure and the thread tension tangent line structure of induced drafting, the driver passes through fixed block fixed mounting overhead at the sewing machine, the connecting block has been linked firmly in the drive shaft of driver, the structure and the thread tension tangent line structrual installation of induced drafting are on the connecting block, the driver can drive the structure and the thread tension tangent line structure of induced drafting and remove sewing machine eedle department or keep away from sewing machine eedle department to reseing, the structure of induced drafting is used for adsorbing the upper thread above the eedle, the thread tension tangent line structure is used for grasping and cutting off the upper thread that the structure of. The bird's nest preventing device of the sewing machine has the advantages of high thread suction success rate, effective prevention of bird's nest generation and low energy consumption.
Description
Technical Field
The invention belongs to the technical field of sewing machines, and relates to a bird nest prevention device of a sewing machine.
Background
A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. The bird nest phenomenon is that when a sewing machine starts sewing, the upper thread is left on the presser foot surface and starts sewing, and then the bottom thread at the beginning appears a thread ball, so that the appearance and the sewing quality of a product are seriously affected, and in order to avoid the bird nest phenomenon, a bird nest prevention structure is usually needed.
The existing square bird nest structure is commonly used in two modes, namely a mechanical wire clamping mode and an air suction pipe wire suction mode. The mechanical thread clamping mode achieves the bird nest prevention effect by trying to clamp the upper thread firstly and then loosening the upper thread after sewing, but the situation that the upper thread cannot be clamped and cannot be clamped easily occurs in the mechanical thread clamping process due to the uncertainty of the position of the upper thread after the last sewing is finished, so that the thread clamping success rate is low. The other mode is that the suction pipe sucks the thread, and the patent is a Chinese patent with the name of a thread sucking type bird nest prevention device and the publication number is CN207313882U, and the patent comprises a machine head, a sewing machine needle, a presser foot with a blade, a thread sweeping rod and an air suction pipe, wherein the sewing machine needle is arranged below the machine head of the sewing machine, the presser foot with the blade is arranged below the machine head through a presser foot handle, the air suction pipe is connected with the machine head through an air suction pipe mounting frame, one side of the machine head is provided with a first air cylinder, the first air cylinder is connected with a first connecting rod, the first connecting rod is hinged with a second connecting rod, the second connecting rod is connected with one end of the thread sweeping rod through a first rotating shaft, and the other end of the thread sweeping rod is a free end and is positioned at the sewing; the other side of the machine head is provided with a second air cylinder, the second air cylinder is connected with one end of a poke rod, the poke rod is hinged to the air suction pipe mounting frame through a second rotating shaft, the other end of the poke rod is hinged to a spherical wire clamping piece, and the spherical wire clamping piece is located on the outer side of the air suction pipe and is in sliding connection with the air suction pipe. This technical scheme is through sweeping line pole, aspiration channel and spherical wire clip's cooperation, better solution the bird's nest problem. There are still some problems: the success rate of the line sweeping rod for shifting the upper line to the air suction pipe is uncertain greatly, namely the success rate of line sweeping is not stable enough, so that the line suction effect of the air suction pipe is poor.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an anti-bird nest device of a sewing machine.
The purpose of the invention can be realized by the following technical scheme: the utility model provides a bird's nest device is prevented to sewing machine which characterized in that: including fixed block, driver, the structure of induced drafting and thread clamping tangent line structure, the driver is through above-mentioned fixed block fixed mounting on the sewing machine aircraft nose, the connecting block has been linked firmly in the drive shaft of driver, the aforesaid is induced drafted the structure and is pressed from both sides thread clamping tangent line structrual installation on above-mentioned connecting block, and above-mentioned driver can drive the aforesaid and induced draft the structure and move sewing machine needle department or keep away from sewing machine needle department to resetting, the structure of induced drafting is used for adsorbing the facial line above the machine needle, thread clamping tangent line structure is used for holding and cutting off the facial line that the structure of induced drafting adsorbed.
In the bird's nest preventing device for the sewing machine, the driver is an air cylinder, and the driving shaft is a piston rod.
In the bird's nest preventing device for the sewing machine, the driver is an oil hydraulic cylinder, a motor or an electromagnet.
In the bird's nest prevention device of the sewing machine, the thread clamping and cutting structure comprises an air ventilation block, a clamping piece rotary connecting block, a clamping piece connecting block, a thread clamping piece and an adjusting device for adjusting the clamping force of the clamping piece and always enabling the clamping piece to tend to be clamped, the air ventilation block is fixedly connected onto the connecting block, the clamping piece rotary connecting block is fixedly installed on the air ventilation block, the thread clamping piece is fixedly installed on the clamping piece connecting block, the clamping piece connecting block is rotatably connected with the clamping piece rotary connecting block, the thread clamping piece comprises a transverse part positioned on the upper end surface of the air ventilation block and a vertical part positioned on the front end side of the air ventilation block, the transverse part and the vertical part are mutually bent and arranged, the thread clamping and cutting structure further comprises an opening and closing joint connected with an external air source and a first air channel arranged in the air ventilation block, one port of the first air channel is just opposite to the transverse part of the thread clamping piece and is positioned under the transverse part of the thread clamping piece, the other port is connected with the opening-closing joint.
In the bird's nest prevention device for the sewing machine, the adjusting device comprises a guide screw, a compression spring and a guide hole formed in the transverse part of the thread clamping piece, the lower end of the guide screw is fixedly connected to the upper end face of the ventilation block, the upper end of the guide screw penetrates through the guide hole, the lower end of the compression spring is abutted against the upper surface of the transverse part of the thread clamping piece, and the upper end of the compression spring is abutted against the upper end of the guide screw.
In the bird's nest preventing device for the sewing machine, the transverse part of the thread clamping sheet is provided with a blade.
In the bird's nest prevention device for the sewing machine, the air suction structure comprises a thread suction joint connected with an external exhaust fan and a second air passage arranged in the ventilation block, one port of the second air passage is positioned on the front end side of the ventilation block and is just opposite to the vertical part of the thread clamping piece, and the other port of the second air passage is connected with the thread suction joint.
In the bird's nest prevention device for the sewing machine, the connecting block is vertically and fixedly connected with the two guide shafts, the fixing block is provided with the two guide holes matched with the two guide shafts, and the two guide shafts are inserted into the two guide holes.
In the bird nest prevention device for the sewing machine, the first air passage and the second air passage are not communicated with each other.
In the bird nest prevention device for the sewing machine, the first air passage and the second air passage are cross hole type.
Compared with the prior art, the bird nest preventing device of the sewing machine has the following advantages:
1. the drive mode of the driver is adopted to replace the existing line sweeping mode, the air suction structure and the line clamping and cutting structure are driven to be close to the needle to suck the facial line during working, and the air suction structure and the line clamping and cutting structure are close to the needle to ensure that the port of the second air passage is close to the drive of the facial line without error, so that the success rate of sucking the facial line is greatly improved and stable compared with the line sweeping mode of the line sweeping mechanism, and the generation of a bird nest is avoided; when the needle is out of work, the air suction structure and the thread clamping and cutting structure retract to be far away from the needle so as to avoid normal work of the needle and limitation of the operation space of workers;
2. the wire clamping and cutting structure is driven in a pneumatic mode, so that the energy consumption is low and the structure is simple;
3. the thread clamping sheet has the thread clamping and thread cutting functions at the same time, so that the structure is simplified, and the cost is reduced.
Drawings
Fig. 1 is a schematic structural view of an anti-nest device of a sewing machine.
Fig. 2 is another schematic structural view of the bird nest preventing device of the sewing machine.
Fig. 3 is a schematic structural view of the vent block.
In the figure, 1, cylinder; 2. a fixed block; 3. a guide shaft; 4. connecting blocks; 5. a ventilation block; 6. the clamping piece is connected with the rotary connecting block; 61. a pin hole; 7. a clamping piece connecting block; 8. a wire clamping sheet; 81. a vertical portion; 82. a transverse portion; 83. a blade; 9. a guide screw; 10. an opening and closing joint; 11. a suction line connector; 12. a first port; 13. a second port.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, 2 and 3, the bird's nest preventing device of the sewing machine comprises a fixing block 2, a driver, an air suction structure and a thread clamping and cutting structure. The driver is a cylinder 1, the cylinder 1 is fixedly arranged on the head of the sewing machine through a fixing block 2, and a piston rod of the cylinder 1 is fixedly connected with a connecting block 4. Two guide shafts 3 are vertically and fixedly connected to the connecting block 4, two guide holes matched with the two guide shafts 3 are formed in the fixing block 2, and the two guide shafts 3 are inserted into the two guide holes. The structure of induced drafting and thread clamping tangent line structrual installation are on connecting block 4, and cylinder 1 work can drive connecting block 4 and the structure of induced drafting and thread clamping tangent line structrual on it and stretch out to eedle department, and the structure of induced drafting can absorb the upper thread on the eedle and have thread clamping tangent line structure to carry.
Specifically, double-layered line tangent line structure includes the piece of ventilating 5, clamping piece gyration connecting block 6, clamping piece connecting block 7, clamping piece 8 and be used for adjusting 8 tight dynamics of clamp line clamp and make 8 tight adjusting device that the trend of clamp line clamp presss from both sides tightly all the time, the piece of ventilating 5 links firmly on connecting block 4, 6 fixed mounting of clamping piece gyration connecting block are on the piece of ventilating 5, 8 fixed mounting of clamping piece are on clamping piece connecting block 7, clamping piece connecting block 7 rotates with clamping piece gyration connecting block 6 to be connected, specifically do: the clamping piece rotary connecting block 6 is provided with a pin hole 61, a pin shaft is arranged on the pin hole 61 and can rotate in the pin hole 61, one end of the clamping piece connecting block 7 is fixedly connected to the pin shaft, and the other end of the clamping piece connecting block is used for fixing the wire clamping piece 8. The thread clamping piece 8 comprises a transverse part 82 located on the upper end face of the ventilation block 5 and a vertical part 81 located on the front end side of the ventilation block 5, the transverse part 82 and the vertical part 81 are mutually bent and arranged at almost vertical angles, the vertical part 81 is in an initial state and is tightly attached to the side wall of the front end of the ventilation block 5, and the vertical part 81 and the side wall of the front end of the ventilation block 5 interact to clamp a thread. The clamping line tangent structure further comprises an opening-closing joint 10 connected with an external air source and a first air passage arranged in the ventilation block 5, one port (the port is a first port 12) of the first air passage is right opposite to the transverse part 82 of the clamping line piece 8 and is located right below the transverse part 82 of the clamping line piece 8, the opening-closing joint 10 is connected to the other port, the first air passage comprises a transverse air passage and a vertical air passage, and a top head is accommodated in the vertical air passage. The adjusting device comprises a guide screw 9, a compression spring and a guide hole formed in the transverse part 82 of the wire clamping piece 8, the lower end of the guide screw 9 is fixedly connected to the upper end face of the ventilation block 5, the upper end of the guide screw 9 penetrates through the guide hole, the lower end of the compression spring is abutted against the upper surface of the transverse part 82 of the wire clamping piece 8, and the upper end of the compression spring is abutted against the upper end of the guide screw 9. In the initial state, the pressing spring is in a compressed state, the transverse part 82 of the wire clamping piece 8 is always pressed downwards by the pressing spring, so that the vertical part 81 of the wire clamping piece 8 always has a tendency of clamping with the front end side wall of the ventilation block 5, and the vertical part 81 of the wire clamping piece 8 is always clamped with the front end side wall of the ventilation block 5 under the condition of no external force. The transverse part 82 of the thread clamping piece 8 is provided with a blade 83, the blade 83 is used for cutting threads, and the thread clamping piece 8 has thread clamping and thread cutting functions at the same time, so that the structure is simplified, and the cost is reduced. The tightness degree of the thread clamping piece 8 can be adjusted by the pressing spring, so that after the sewing of the machine needle, the upper thread after thread cutting slides out in a blocking way to form a short thread end.
The air suction structure comprises an air suction line connector 11 connected with an external exhaust fan and a second air passage arranged in the air ventilation block 5, one port (the port is a second port 13) of the second air passage is positioned on the front end side of the air ventilation block 5 and is just opposite to the vertical part 81 of the wire clamping piece 8, and the other port of the second air passage is connected with the air suction line connector 11. The first air passage and the second air passage are not communicated with each other. The wire clamping and cutting structure and the air suction structure are driven in a pneumatic mode, so that the energy consumption is low, and the structure is simple. The second air passage is Z-shaped, and the second port 13 on the front end side of the ventilation block 5 is larger in opening, so that the noodle can be successfully sucked into the second port 13.
The working process is detailed as follows:
in the initial state, the air cylinder 1 keeps the contraction state, the air suction structure and the wire clamping and cutting structure of the air cylinder are in the state of being far away from the machine needle, and the vertical part 81 of the wire clamping piece 8 is in the state of clamping the side wall of the front end of the ventilation block 5 under the action of the compression spring. When the sewing is finished, the air cylinder 1 drives the piston rod to extend out, the connecting block 4 drives the air suction structure and the thread clamping tangent structure to be close to the needle of the sewing machine under the guiding action of the two guiding shafts 3, the sewing machine has an electric control as a control center, the electric control controls the opening and closing joint 10 to open to work, the first air passage is introduced with high-pressure air flow, the high-pressure air flow drives the top head to move upwards to the outside of the first port 12 of the first air passage and upwards rotates the thread pressing sheet transverse part 82 and the clamping sheet connecting block 7 around a pin shaft on the rotary clamping sheet connecting block 6 under the action of a pressing spring, the vertical part 81 of the thread clamping sheet 8 moves away from the side wall of the front end of the air ventilation block 5 along with the rotation, a larger opening is formed between the vertical part 81 of the thread clamping sheet 8 and the side wall of the front end of the air ventilation block 5, the second port 13 of the second air passage, the air pressure of the second air passage is reduced rapidly, the second port 13 of the second air passage on the side wall of the front end of the ventilation block 5 forms larger negative pressure, and the opening is larger, so that the upper thread on the needle is easier to be sucked into the second port 13. Then, the electric control opening and closing connector 10 is closed, the air pressure in the first air duct is recovered to be normal, the top head descends, the line pressing piece of the electric control opening and closing connector resets under the action of the compression spring, the vertical portion 81 of the line pressing piece clamps the sucked facial line between the vertical portion 81 and the side wall of the front end of the ventilation block 5, meanwhile, the facial line is cut through the cutting edge 83 under the negative pressure air suction effect, the electric control line suction connector 11 is closed, the exhaust fan stops working, and the air cylinder 1 resets and retracts. When sewing once more, after sewing up first needle, automatically controlled control open and shut and connect 10 and reopen and open with drive thread tension mask 8 and open, the facial suture just can not be taken the cut-parts below and produced and pile up, has avoided the production of bird's nest.
The bird nest prevention device adopts a driving mode of the air cylinder 1 to replace the existing line sweeping mode, the air suction structure and the line clamping and cutting structure are driven to be close to the needle to suck the facial line during working, and the second port 13 of the second air passage is driven to be close to the facial line without error because the air suction structure and the line clamping and cutting structure are close to the needle, so that the success rate of sucking the facial line is greatly improved and stable relative to the line sweeping mode of the line sweeping mechanism, and the bird nest is avoided; when the machine does not work, the air suction structure and the thread clamping and cutting structure retract to be away from the machine needle so as to avoid the limitation of the normal work of the machine needle and the operation space of workers.
The driver in this embodiment may also be an oil hydraulic cylinder, a motor, or an electromagnet. The first air passage and the second air passage can also be in a cross hole type, and the cross hole type forms a Bernoulli effect, generates strong negative pressure and improves the success rate of sucking the upper thread at the machine needle.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. The utility model provides a bird's nest device is prevented to sewing machine which characterized in that: comprises a fixed block (2), a driver, an air suction structure and a thread clamping and cutting structure, wherein the driver is fixedly arranged on a sewing machine head through the fixed block (2), a connecting block (4) is fixedly connected on a driving shaft of the driver, the air suction structure and the thread clamping and cutting structure are arranged on the connecting block (4), the driver can drive the air suction structure and the thread clamping and cutting structure to move to a sewing machine needle or keep away from the sewing machine needle to reset, the air suction structure is used for adsorbing a facial thread on the sewing machine needle, the thread clamping and cutting structure is used for clamping and cutting the facial thread adsorbed by the air suction structure, the thread clamping and cutting structure comprises an air through block (5), a clamping piece rotating connecting block (6), a clamping piece connecting block (7), a thread clamping piece (8) and an adjusting device used for adjusting the clamping force of the thread clamping piece (8) and enabling the thread clamping piece (8) to tend to clamp all the time, the ventilating block (5) is fixedly connected on the connecting block (4), the clamping piece rotary connecting block (6) is fixedly arranged on the ventilating block (5), the clamping wire piece (8) is fixedly arranged on the clamping piece connecting block (7), the clamping piece connecting block (7) is rotationally connected with the clamping piece rotating connecting block (6), the clamping wire piece (8) comprises a transverse part (82) positioned on the upper end face of the ventilating block (5) and a vertical part (81) positioned on the front end side of the ventilating block (5), the transverse part (82) and the vertical part (81) are arranged in a mutually bent way, the wire clamping and cutting structure also comprises an opening-closing joint (10) connected with an external air source and a first air channel arranged in the air vent block (5), one port of the first air passage is arranged right opposite to the transverse part (82) of the wire clamping sheet (8) and is positioned right below the transverse part (82), and the other port of the first air passage is connected with the opening-closing joint (10).
2. The anti-bird nest device of sewing machine according to claim 1, wherein the actuator is a cylinder (1) and the driving shaft is a piston rod.
3. The anti-nesting device of claim 1, wherein said actuator is a hydraulic cylinder, a motor or an electromagnet.
4. The bird nest preventing device of the sewing machine as claimed in claim 3, wherein the adjusting device comprises a guide screw (9), a compression spring and a guide hole formed in the transverse part (82) of the thread clamping piece (8), the lower end of the guide screw (9) is fixedly connected to the upper end surface of the ventilation block (5), the upper end of the guide screw (9) penetrates through the guide hole, the lower end of the compression spring abuts against the upper surface of the transverse part (82) of the thread clamping piece (8), and the upper end of the compression spring abuts against the upper end of the guide screw (9).
5. The anti-bird nest device of sewing machine according to claim 4, characterized in that the lateral portion (82) of the thread tension sheet (8) has a blade (83).
6. The bird nest preventing device of the sewing machine according to claim 4, wherein the air suction structure comprises a thread suction joint (11) connected with an external air suction fan and a second air passage arranged in the air vent block (5), one port of the second air passage is positioned on the front end side of the air vent block (5) and is opposite to the vertical part (81) of the thread clamping piece (8), and the other port of the second air passage is connected with the thread suction joint (11).
7. The bird nest preventing device of the sewing machine according to claim 1, wherein the connecting block (4) is vertically fixedly connected with two guide shafts (3), the fixing block (2) is provided with two guide holes matched with the two guide shafts (3), and the two guide shafts (3) are inserted into the two guide holes.
8. The anti-bird nest device of claim 6, wherein the first air passage and the second air passage are not in communication with each other.
9. The anti-bird nest device of sewing machine of claim 6, wherein the first air passage and the second air passage are cross-hole type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910132273.4A CN109778446B (en) | 2019-02-22 | 2019-02-22 | Bird nest preventing device of sewing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910132273.4A CN109778446B (en) | 2019-02-22 | 2019-02-22 | Bird nest preventing device of sewing machine |
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| CN109778446A CN109778446A (en) | 2019-05-21 |
| CN109778446B true CN109778446B (en) | 2021-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910132273.4A Active CN109778446B (en) | 2019-02-22 | 2019-02-22 | Bird nest preventing device of sewing machine |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111206347B (en) * | 2020-01-20 | 2021-06-25 | 拓卡奔马机电科技有限公司 | Device for reducing bird nest in sewing machine |
| CN113529297A (en) * | 2020-04-17 | 2021-10-22 | 浙江沪龙科技股份有限公司 | Air blowing type bird nest prevention device and using method |
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|---|---|---|---|---|
| EP0041435A1 (en) * | 1980-06-04 | 1981-12-09 | ETABLISSEMENTS OLIVIER GUILLE & FILS Société Anonyme française | Thread chain severing device for overseam sewing machine |
| US4478163A (en) * | 1982-09-28 | 1984-10-23 | Keeton John H | Dual exposure hot wire cutter |
| CN201106095Y (en) * | 2007-09-25 | 2008-08-27 | 中山百川汇盈精密实业有限公司 | Thread trimmer |
| CN202030914U (en) * | 2011-01-11 | 2011-11-09 | 卢汝明 | Knife rest of thread cutting device of sewing machine |
| CN108978061A (en) * | 2018-10-09 | 2018-12-11 | 沈小燕 | A kind of handbag automatic thread trimming device |
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2019
- 2019-02-22 CN CN201910132273.4A patent/CN109778446B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0041435A1 (en) * | 1980-06-04 | 1981-12-09 | ETABLISSEMENTS OLIVIER GUILLE & FILS Société Anonyme française | Thread chain severing device for overseam sewing machine |
| US4478163A (en) * | 1982-09-28 | 1984-10-23 | Keeton John H | Dual exposure hot wire cutter |
| CN201106095Y (en) * | 2007-09-25 | 2008-08-27 | 中山百川汇盈精密实业有限公司 | Thread trimmer |
| CN202030914U (en) * | 2011-01-11 | 2011-11-09 | 卢汝明 | Knife rest of thread cutting device of sewing machine |
| CN108978061A (en) * | 2018-10-09 | 2018-12-11 | 沈小燕 | A kind of handbag automatic thread trimming device |
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Address after: 318014 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318010 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou Patentee before: JACK SEWING MACHINE Co.,Ltd. |