CN114606665A - High-frequency operation and wear early warning mechanism of sewing machine - Google Patents
High-frequency operation and wear early warning mechanism of sewing machine Download PDFInfo
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- CN114606665A CN114606665A CN202210247618.2A CN202210247618A CN114606665A CN 114606665 A CN114606665 A CN 114606665A CN 202210247618 A CN202210247618 A CN 202210247618A CN 114606665 A CN114606665 A CN 114606665A
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- 238000009958 sewing Methods 0.000 title claims abstract description 35
- 238000009966 trimming Methods 0.000 claims abstract description 60
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 8
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005299 abrasion Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000003892 spreading Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009323 psychological health Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
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- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/36—Devices for stopping drive when abnormal conditions occur, e.g. thread breakage
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention discloses a high-frequency operation and wear early warning mechanism of a sewing machine, which comprises an acquisition module, a communication module, a driving module, a monitoring management cloud platform and a terminal, wherein the acquisition module, the communication module, the driving module, the monitoring management cloud platform and the terminal are sequentially connected, the acquisition module is respectively connected with a tooth lifting module, a presser foot lifting module, a thread cutting module and a thread loosening module, and the terminal is connected with the driving module. According to the technical scheme, the wearing detection of the damageable key parts in the tooth lifting module, the presser foot lifting module, the thread trimming module, the thread loosening module and the driving module in the sewing machine is realized through the acquisition module, so that the actual judgment of the wearing of equipment parts is realized, and the potential hazards of quality defects of products caused by the fact that the condition of the equipment parts is difficult to feed back in time are avoided.
Description
Technical Field
The invention relates to the technical field of detection and early warning of sewing machines, in particular to a high-frequency operation and wear early warning mechanism of a sewing machine.
Background
The sewing machine is widely applied to processing occasions such as clothing production, cloth art, packaging and the like. Along with the development of industry, the production efficiency of a sewing machine is higher and higher, the sewing speed of the sewing machine is also higher and higher, a large number of moving parts exist in the industrial sewing machine, the mass of each moving part is concentrated at the position of the gravity center of each moving part, the gravity center is also often called as the mass center, when the machine runs at a high speed, the position of the mass points on the space is periodically changed, and a large inertia force is inevitably generated due to the high moving speed; on one hand, the inertia forces finally act on the rack through transmission parts (such as connecting rods, crank arms and the like), so that the whole machine is in violent vibration; on the other hand, these inertia forces will simultaneously form a couple, i.e. an inertia moment, which tends to overturn the machine, also increasing the vibrations of the machine. The vibration not only can generate harsh noise, but also can aggravate the abrasion of a moving pair of a moving part, influence the working precision and reliability of a machine and cause damage to the physical and psychological health of an operator.
In general, in a sewing machine, a floating portion in which one member floats on the other member is provided at a plurality of positions of a drive transmission mechanism, a thread take-up mechanism, a needle bar mechanism, and a presser foot mechanism. When one of the members rotates, rocks, slides, or the like as the sewing machine is operated, the sliding surfaces of the two members repeat impact and collision under a strong surface pressure due to the vibration of the one member on the floating-embedding portion. In a sliding member which generates an impact under a strong surface pressure on a sliding surface of the floating and fitting portion, that is, a wear member, the sliding surface is subjected to blunting, wear, and play in operation such as rotation due to collision (wear), and the sliding surface is burned due to heat generation by frictional resistance.
Chinese patent document CN107059270B discloses a "sewing machine and its vibration damping mechanism". The vertical inertial force can be generated by the up-and-down reciprocating motion of the sewing needle connecting rod, and the left-and-right inertial force can be generated by the left-and-right reciprocating motion of the curved needle connecting rod; when the sewing needle connecting rod moves downwards, the inertia force generated by the sewing needle connecting rod has a larger vertical downward component, and at the moment, the mass center of the additional balance block deflects upwards, and the additional balance block can generate a vertical upward component; when the needle connecting rod moves upwards, the inertia force generated by the needle connecting rod has a larger vertical upward component, and at the moment, the mass center of the additional balance block deflects downwards, and the additional balance block can generate a vertical downward component. The technical scheme only comprises the alleviation of the abrasion of the equipment parts, the actual judgment of the abrasion of the equipment parts is lacked, and the potential hazards of quality defects of products caused by the fact that the conditions of the equipment parts are difficult to feed back in time.
Disclosure of Invention
The invention mainly solves the technical problems that the prior technical scheme only comprises the alleviation of the abrasion of equipment parts, the lack of actual judgment of the abrasion of the equipment parts and the difficulty in timely feeding back the conditions of the equipment parts, which cause the hidden danger of quality defects of products.
The technical problem of the invention is mainly solved by the following technical scheme: the thread-lifting and thread-releasing monitoring system comprises a collection module, a communication module, a driving module, a monitoring management cloud platform and a terminal which are sequentially connected, wherein the collection module is respectively connected with a tooth lifting module, a pressure lifting pin module, a thread-cutting module and a thread-releasing module, and the terminal is connected with the driving module. The acquisition module is used for acquiring equipment part information, the acquisition information is transmitted to the driving module through the communication module to realize equipment part condition judgment, the driving module issues corresponding instructions according to judgment results to realize control over the sewing machine, meanwhile, the acquisition information and the judgment results are transmitted to the monitoring management cloud platform, and a user accesses data through a field terminal or accesses the monitoring management cloud platform through a wireless terminal to realize remote monitoring.
Preferably, the driving module comprises a tooth lifting driving piece connected with the tooth lifting module, a foot lifting driving piece connected with the foot lifting module, a thread trimming driving piece connected with the thread trimming module, and a thread loosening driving piece connected with the thread loosening module. The driving module realizes the control of the sewing machine through the tooth lifting driving piece, the presser foot lifting driving piece, the thread cutting driving piece and the thread loosening driving piece.
Preferably, the presser foot lifting module comprises a right lever, a presser foot lifting pull rod, a left lever, a thread loosening pushing part, a presser foot lifting crank, a presser foot lifting roller and a presser foot lifting ejector rod, the presser foot lifting crank is provided with a third fixed swing fulcrum, the presser foot lifting crank is provided with the presser foot lifting roller and the presser foot lifting ejector rod, one end of the presser foot lifting ejector rod is hinged to the presser foot lifting crank, the other end of the presser foot lifting ejector rod is hinged to the right lever, and when a motor shaft of the driving motor operates in a presser foot lifting area, the presser foot lifting roller is in abutting fit with a cam surface of a presser foot lifting reducing guide section of the presser foot lifting driving part.
Preferably, the thread releasing mechanism comprises a thread releasing lever, a thread releasing shaft nail and a thread clamping device, and the thread releasing shaft nail is arranged on the thread clamping device. The driving inclined plane on the thread loosening lever pushes the thread loosening and thread laying nail to move, so that the thread loosening and thread laying nail is inserted into the thread clamping device, and the thread clamping device is driven to automatically loosen threads.
Preferably, the outer peripheral surface of the trimming driving piece is provided with a trimming reducing cam surface, and the trimming reducing cam surface of the trimming driving piece is in butt fit with the trimming roller. The thread cutting reducing cam surface is abutted with the thread cutting roller to ensure that the spinning thread is cut off smoothly.
Preferably, the outer peripheral surface of the thread loosening driving piece is provided with a thread loosening reducing cam surface, and the thread loosening driving piece is connected with a thread loosening lever in the thread loosening mechanism; when a motor shaft of the driving motor runs, the thread loosening reducing cam surface of the thread loosening driving piece is in butt fit with the thread loosening roller.
Preferably, the thread releasing lever is provided with a fixed swing fulcrum, the thread releasing lever is provided with a driving inclined plane in contact fit with the thread releasing and nail spreading, and when the thread releasing lever rotates, the driving inclined plane on the thread releasing lever pushes the thread releasing and nail spreading to move, so that the thread releasing and nail spreading is inserted into the thread clamping device, and the thread clamping device is driven to automatically release threads.
Preferably, the acquisition module comprises a trimming judgment device arranged on two sides of a contact point of the trimming roller and the trimming reducing cam surface, a radian judgment device arranged on one side of the cam surface of the pressing foot lifting reducing guide section of the driving motor, and a contact judgment device arranged in the wire clamp. The collecting module carries out data collection according to set frequency, the thread trimming judging device is used for judging whether the thread trimming device can smoothly trim the spun thread, the radian judging device is used for judging whether the side radian of the cam surface of the reducing guide section of the pressure lifting foot can sufficiently meet the rising height of the pressure lifting foot, and the contact judging device is used for judging whether a thread loosening screw is inserted into the accurate position of the thread clamping device or not, so that the thread clamping device is effectively driven to automatically loosen the thread.
Preferably, the trimming judgment device comprises an infrared signal transmitter and an infrared signal receiver which are respectively arranged on two sides of the trimming roller and the trimming reducing cam surface contact point, and an infrared path of the trimming judgment device is coincided with the line track at the trimming time. When the infrared signal receiver receives infrared light sent by the infrared signal transmitter, it is judged that no butt exists between the trimming reducing cam surface and the trimming roller, a gap exists, smooth trimming of the spun yarn cannot be guaranteed, and the driving module stops working and sends alarm information to the terminal.
Preferably, the radian judging device comprises a radian sensor, and the radian sensor corresponds to the position of the cam surface of the reducing guide section of the pressure lifting and pressing foot. And setting a radian judgment threshold, and when the radian of the cam surface of the reducing guide section of the pressure foot lifting is smaller than the radian judgment threshold, which is acquired by the radian sensor, determining that the lifting height of the pressure foot lifting is insufficient, and stopping the work of the driving module and sending alarm information to the terminal.
The invention has the beneficial effects that: wear detection of vulnerable key parts in a tooth lifting module, a presser foot lifting module, a thread trimming module, a thread loosening module and a driving module in the sewing machine is achieved through the acquisition module, actual judgment of wear of equipment parts is achieved, and the problem that potential quality defects of products are caused due to the fact that the condition of the equipment parts is difficult to feed back in time is avoided.
Drawings
Fig. 1 is a schematic connection structure diagram of the present invention.
FIG. 2 is a schematic view of a sewing machine according to the present invention.
Fig. 3 is a schematic structural diagram of a driving motor and a lifting tooth mechanism according to the present invention.
Fig. 4 is a schematic structural view of a tooth adjusting driving member and a thread trimming driving member of the present invention.
Fig. 5 is a schematic view of the structure of a lift and presser foot drive and a thread release drive of the present invention.
In the figure, 1 a thread lifting module, 2 a presser foot lifting module, 2.1 a right lever, 2.2 a presser foot lifting pull rod, 2.3 a left lever, 2.4 a thread loosening pushing part, 2.5 a presser foot lifting crank, 2.6 a presser foot lifting roller, 2.7 a presser foot lifting ejector rod, 3 a thread trimming module, 4 a thread loosening module, 4.1 a thread loosening lever, 4.2 a thread loosening auxiliary nail, 5 a driving module, 5.1 a driving motor, 5.2 a thread adjusting driving piece, 5.3 a thread adjusting reducing cam surface, 5.4 a presser foot lifting driving piece, 5.5 a presser foot lifting reducing cam surface, 5.6 a thread trimming driving piece, 5.7 a thread trimming reducing cam surface, 5.8 a thread loosening driving piece, 5.9 a thread loosening reducing cam surface, 6 a driving shaft, 7 a main motor, 8 a thread clamp, 9 a fixed support, 10 a thickness detection device and 11 a reset reducing cam.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the high-frequency operation and wear early warning mechanism of the sewing machine in the embodiment comprises a collection module, a communication module, a driving module 5, a monitoring management cloud platform and a terminal which are sequentially connected, wherein the collection module is respectively connected with a feed lifting tooth module 1, a pressure foot lifting module 2, a thread trimming module 3 and a thread loosening module 4, and the terminal is connected with the driving module 5. The acquisition module is used for acquiring equipment part information, the acquisition information is transmitted to the driving module through the communication module to realize equipment part condition judgment, the driving module issues corresponding instructions according to judgment results to realize control over the sewing machine, meanwhile, the acquisition information and the judgment results are transmitted to the monitoring management cloud platform, and a user accesses data through a field terminal or accesses the monitoring management cloud platform through a wireless terminal to realize remote monitoring.
As shown in fig. 2 and 3, the driving module 5 includes a lifting tooth driving member 5.2 connected to the lifting tooth module 1, a lifting and pressing foot driving member 5.4 connected to the lifting and pressing foot module 2, a trimming driving member 5.6 connected to the trimming module 3, and a thread releasing driving member 5.8 connected to the thread releasing module 4. The driving module realizes the control of the sewing machine through the tooth lifting driving piece, the presser foot lifting driving piece, the thread cutting driving piece and the thread loosening driving piece.
The presser foot lifting module 2 comprises a right lever 2.1, a presser foot lifting pull rod 2.2, a left lever 2.3, a thread loosening pushing part 2.4, a presser foot lifting crank 2.5, a presser foot lifting roller 2.6 and a presser foot lifting ejector rod 2.7, wherein the presser foot lifting crank 2.5 is provided with a third fixed swing fulcrum, the presser foot lifting crank 2.5 is provided with a presser foot lifting roller 2.6 and a presser foot lifting ejector rod 2.7, one end of the presser foot lifting ejector rod 2.7 is hinged with the presser foot lifting crank 2.5, the other end of the presser foot lifting ejector rod is hinged with the right lever 2.1, and when a motor shaft of the driving motor 5.1 operates in a presser foot lifting area, the presser foot lifting roller 2.6 is in butt fit with a presser foot lifting reducing guide section 5.5.5 of a presser foot lifting driving part 5.4.
The thread releasing mechanism 4 comprises a thread releasing lever 4.1, a thread releasing shaft nail 4.2 and a thread clamping device 8, and the thread releasing shaft nail 4.2 is arranged on the thread clamping device 8. The peripheral surface of the thread loosening driving piece 5.8 is provided with a thread loosening reducing cam surface 5.9, and the thread loosening driving piece 5.8 is connected with a thread loosening lever 4.1 in the thread loosening mechanism 4; when the motor shaft of the driving motor 5.1 runs, the thread loosening reducing cam surface 5.9 of the thread loosening driving piece 5.8 is in butt fit with the thread loosening roller. The thread loosening lever 4.1 is provided with a fixed swing fulcrum, a driving inclined plane in contact fit with the thread loosening paving nail 4.2 is arranged on the thread loosening lever 4.1, and when the thread loosening lever 4.1 rotates, the driving inclined plane on the thread loosening lever 4.1 pushes the thread loosening paving nail 4.2 to move, so that the thread loosening paving nail 4.2 is inserted into the thread clamping device 8, and the thread clamping device 8 is driven to automatically loosen threads.
The acquisition module comprises a trimming judgment device arranged on two sides of a contact point of the trimming roller and the trimming reducing cam surface 5.7, a radian judgment device arranged on one side of the cam surface 5.5 of the lifting presser foot reducing guide section facing the driving motor 5.1 and a contact judgment device arranged in the wire clamp 8. The collecting module is used for collecting data according to a set frequency, the yarn shearing judging device is used for judging whether the yarn shearing device can smoothly shear the spun yarn, the radian judging device is used for judging whether the side surface radian of the cam surface of the reducing guide section of the pressure lifting foot can meet the rising height of the pressure lifting foot or not, and the contact judging device is used for judging whether the loose yarn laying nail can be inserted into the accurate position of the yarn clamping device or not, so that the yarn clamping device is effectively driven to automatically loosen the yarn.
As shown in fig. 4, the outer peripheral surface of the trimming driving piece 5.6 has a trimming reducing cam surface 5.7, and the trimming reducing cam surface 5.7 of the trimming driving piece 5.6 is in butt fit with the trimming roller. The trimming judgment device comprises an infrared signal transmitter and an infrared signal receiver which are respectively arranged on two sides of a contact point of the trimming roller and the trimming reducing cam surface 5.7, and an infrared path of the trimming judgment device is coincided with a line track at the trimming time. When the infrared signal receiver receives infrared light sent by the infrared signal transmitter, it is judged that no butt exists between the trimming reducing cam surface and the trimming roller, a gap exists, smooth trimming of the spun yarn cannot be guaranteed, and the driving module stops working and sends alarm information to the terminal.
As shown in fig. 5, the radian determining device comprises a radian sensor corresponding to the position of the cam surface 5.5 of the reducing guide section of the pressure raising and pressing foot. And setting a radian judgment threshold, and when the radian of the cam surface of the reducing guide section of the pressure foot lifting is smaller than the radian judgment threshold, which is acquired by the radian sensor, determining that the lifting height of the pressure foot lifting is insufficient, and stopping the work of the driving module and sending alarm information to the terminal.
During operation, the collection module is through setting up the trimming judgement device in trimming gyro wheel and trimming reducing cam surface 5.7 contact point both sides, the radian judgement device of setting 5.5 one side towards lifting presser foot reducing guide section cam surface at driving motor 5.1, and the contact judgement device of setting in thread trapper 8 gathers vulnerable part information, then transmit the acquisition information to drive module through communication module and realize that equipment part situation judges, drive module assigns corresponding instruction according to the judged result and realizes the on-off control to the sewing machine, transmit acquisition information and judged result to control management cloud platform simultaneously, the user visits the data through field terminal or visits control management cloud platform through wireless terminal and realizes remote monitoring.
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.
Although the terms acquisition module, presser foot lifting module, thread trimming module, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. The high-frequency operation and wear early warning mechanism of the sewing machine is characterized by comprising a collection module, a communication module, a driving module (5), a monitoring management cloud platform and a terminal which are sequentially connected, wherein the collection module is respectively connected with a tooth lifting module (1), a presser foot lifting module (2), a thread trimming module (3) and a thread loosening module (4), and the terminal is connected with the driving module (5).
2. A high frequency operation and wear warning mechanism for a sewing machine according to claim 1, wherein the drive module (5) comprises a feed lifting actuating member (5.2) connected to the feed lifting module (1), a feed lifting actuating member (5.4) connected to the feed lifting module (2), a thread trimming actuating member (5.6) connected to the thread trimming module (3), and a thread slacking actuating member (5.8) connected to the thread slacking module (4).
3. The high frequency operation and wear warning mechanism of sewing machine as claimed in claim 2, the presser foot lifting module (2) comprises a right lever (2.1), a presser foot lifting pull rod (2.2), a left lever (2.3), a thread loosening pushing part (2.4), a presser foot lifting crank (2.5), a presser foot lifting roller (2.6) and a presser foot lifting ejector rod (2.7), the presser foot lifting crank (2.5) is provided with a third fixed swing fulcrum, a presser foot lifting roller (2.6) and a presser foot lifting ejector rod (2.7) are arranged on the presser foot lifting crank (2.5), one end of the presser foot lifting mandril (2.7) is hinged with a presser foot lifting crank (2.5), the other end is hinged with a right lever (2.1), when a motor shaft of the driving motor (5.1) runs in the presser foot lifting area, the presser foot lifting roller (2.6) is in butt fit with a cam surface (5.5) of a presser foot lifting reducing guide section of a presser foot lifting driving piece (5.4).
4. Sewing machine high-frequency operation and wear warning mechanism according to claim 1, characterized in that the thread releasing mechanism (4) comprises a thread releasing lever (4.1), a thread releasing pintle (4.2) and a thread clamp (8), the thread releasing pintle (4.2) being arranged on the thread clamp (8).
5. The high-frequency operation and wear early warning mechanism of the sewing machine according to claim 2, characterized in that the outer peripheral surface of the thread cutting driving piece (5.6) is provided with a thread cutting reducing cam surface (5.7), and the thread cutting reducing cam surface (5.7) of the thread cutting driving piece (5.6) is in butt fit with the thread cutting roller.
6. The high-frequency operation and wear early warning mechanism of the sewing machine as claimed in claim 2, characterized in that the outer circumference of the thread releasing driving piece (5.8) is provided with a thread releasing reducing cam surface (5.9), and the thread releasing driving piece (5.8) is connected with a thread releasing lever (4.1) in the thread releasing mechanism (4); when a motor shaft of the driving motor (5.1) runs, the thread loosening reducing cam surface (5.9) of the thread loosening driving piece (5.8) is in butt fit with the thread loosening roller.
7. The high-frequency operation and wear early warning mechanism of the sewing machine as claimed in claim 1, characterized in that the thread releasing lever (4.1) has a fixed swing fulcrum, the thread releasing lever (4.1) is provided with a driving bevel in contact fit with the thread releasing spread nail (4.2), when the thread releasing lever (4.1) rotates, the driving bevel on the thread releasing lever (4.1) pushes the thread releasing spread nail (4.2) to move, so that the thread releasing spread nail (4.2) is inserted into the thread clamping device (8), and the thread clamping device (8) is driven to automatically release threads.
8. The high-frequency operation and wear early warning mechanism of the sewing machine as claimed in claim 2, wherein the acquisition module comprises a trimming judgment device arranged on two sides of a contact point of the trimming roller and the trimming reducing cam surface (5.7), a radian judgment device arranged on one side of the cam surface (5.5) of the reducing guide section of the pressure foot lifting and lifting of the driving motor (5.1) and a contact judgment device arranged in the thread clamping device (8).
9. The high-frequency operation and wear early warning mechanism of a sewing machine according to claim 8, wherein the thread trimming judging device comprises an infrared signal transmitter and an infrared signal receiver which are respectively arranged at two sides of a contact point of the thread trimming roller and the thread trimming variable cam surface (5.7), and an infrared path of the thread trimming judging device is coincided with a thread track at the thread trimming time.
10. The high-frequency operation and wear early warning mechanism of the sewing machine according to claim 8, wherein the radian determining device comprises a radian sensor corresponding to the position of the cam surface (5.5) of the reducing guide section of the presser foot.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210247618.2A CN114606665B (en) | 2022-03-14 | 2022-03-14 | High-frequency operation and wear early warning mechanism of sewing machine |
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| CN202210247618.2A CN114606665B (en) | 2022-03-14 | 2022-03-14 | High-frequency operation and wear early warning mechanism of sewing machine |
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| CN114606665B CN114606665B (en) | 2023-12-29 |
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| CN212152641U (en) * | 2020-04-01 | 2020-12-15 | 浙江翔科缝纫机股份有限公司 | Automatic presser foot lifting, thread trimming and thread loosening driving mechanism of sewing machine |
| CN113604986A (en) * | 2021-08-09 | 2021-11-05 | 杰克缝纫机股份有限公司 | Sewing machine |
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| JPH0733278U (en) * | 1993-11-24 | 1995-06-20 | ジューキ株式会社 | Rotating member position detection device and rotating member mechanism of sewing machine |
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