CN114960055A - Control method of thread hooking mechanism of sewing machine - Google Patents
Control method of thread hooking mechanism of sewing machine Download PDFInfo
- Publication number
- CN114960055A CN114960055A CN202110204250.7A CN202110204250A CN114960055A CN 114960055 A CN114960055 A CN 114960055A CN 202110204250 A CN202110204250 A CN 202110204250A CN 114960055 A CN114960055 A CN 114960055A
- Authority
- CN
- China
- Prior art keywords
- thread hooking
- rotating shuttle
- control method
- hooking mechanism
- driving source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B57/00—Loop takers, e.g. loopers
- D05B57/30—Driving-gear for loop takers
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
The invention provides a control method of a thread hooking mechanism of a sewing machine, wherein the thread hooking mechanism is matched with a cloth pricking mechanism positioned above the thread hooking mechanism, a driving source is respectively arranged in the cloth pricking mechanism and the thread hooking mechanism, a rotating shuttle in the thread hooking mechanism is driven by a first driving source to rotate, a machine needle in the cloth pricking mechanism is driven by a second driving source to reciprocate in the vertical direction, and the rotating speed ratio of a main shaft in the rotating shuttle to a main shaft in the cloth pricking mechanism is 1: 1; the idle area of the rotating shuttle comprises a deceleration area after the thread is off and an acceleration area before the thread hooking starts. The invention has the advantages that: the working load of the rotating shuttle is greatly reduced, and the service life can be greatly prolonged; because the thread hooking mechanism and the cloth pricking mechanism are driven by independent driving sources, the matching time sequence between the rotating shuttle and the machine needle is adjustable, namely the numerical value of the lifting height delta H can be adjusted by adjusting the running time sequence of the first driving source relative to the second driving source, and the thickness adaptability of the machine is greatly improved.
Description
Technical Field
The invention relates to a control method of a thread hooking mechanism of a sewing machine.
Background
In the existing sewing machine, the thread hooking mechanism and the cloth pricking mechanism share one driving source, and two groups of gears are arranged between the thread hooking mechanism and the cloth pricking mechanism for transmission. As shown in fig. 1, in the conventional needle cloth mechanism and the conventional hook mechanism, a driving source (not shown) drives a main shaft 1 to rotate, a needle bar crank 2 is fixed to one end of the main shaft 1, the needle bar crank 2 is hinged to one end of a connecting rod 3, the other end of the connecting rod 3 is hinged to a connecting post 4 fixed to a needle bar 5, the needle bar 5 is disposed in a housing and can slide in a vertical direction, and a needle 6 is fixed below the needle bar 5. When the main shaft 1 rotates, the needle 6 can be driven to reciprocate along the vertical direction, and the cloth pricking effect is realized. A first gear set 91 is arranged between the other end of the main shaft 1 and the vertical shaft 10, a second gear set 92 is arranged between the vertical shaft 10 and the lower shaft 8, a rotating shuttle 7 is fixed at the front end of the lower shaft 8, and the rotating speed ratio of the rotating shuttle 7 to the main shaft 1 is 2: 1.
as shown in FIG. 2, the thread hooking process of the thread hooking mechanism can be roughly divided into three steps of starting thread hooking, enlarging a thread ring and releasing thread. When the tip 71 of the rotary hook 7 coincides with the needle 6, the rotary hook 7 starts hooking (marked as 0 °), after which the needle 6 continues to rise, the rotary hook 7 rotates and continuously enlarges the loop 61 at the needle plate hole 62 to the maximum, and then the loop 61 drops off from the tip 71, completing a hooking process to form a stitch. Except for the thread hooking process, the rotating shuttle 7 still rotates along with the rotation of the main shaft 1, but does not participate in stitch formation and is in an idle state. Therefore, as shown in fig. 3, in the case where the main shaft 1 makes one rotation (360 °), the rotary hook 7 makes two rotations (720 °), but its effective working area is only one third of the total period.
As shown in fig. 4, the timing sequence of the engagement between the rotating hook 7 and the needle 6 is generally characterized by a lift-back height Δ H, which means: the needle 6 when the beak 71 coincides with the needle 6 is recorded as state a, the needle 6 when it is at the lowest point in the working process is recorded as state B, and the vertical direction height difference between the state a and the state B is Δ H. A smaller value of Δ H indicates a faster timing of the rotary hook 7 with respect to the needle 6, and a larger value of Δ H indicates a slower timing of the rotary hook 7 with respect to the needle 6. Generally, the value of Δ H is small when sewing thinner fabrics and is large when sewing thicker fabrics.
In summary, the conventional thread hooking mechanism has the following disadvantages:
1. the rotating shuttle 7 has high rotating speed and is easy to wear. If the main shaft 1 keeps the conventional rotating speed of 5000r/min, the rotating speed of the rotating shuttle 7 needs to reach 10000r/min, and the rotating speed is high, so that the inner part of the rotating shuttle 7 is easy to wear and has a short service life;
2. the working area of the rotating shuttle 7 only occupies about one third of the total period, and the efficiency is low;
3. the matching relation between the rotating shuttle 7 and the needle 6 is determined by the assembly state, the Delta H cannot be adjusted automatically, and the manual adjustment is needed by professional personnel through the ways of disassembling, replacing and adjusting parts;
4. the transmission between the thread hooking mechanism and the cloth pricking mechanism is realized by arranging the first gear set 91 and the second gear set 92, the whole structure is complex, the gears are easy to wear, and the noise is large during working.
Disclosure of Invention
In view of the above-mentioned drawbacks, an object of the present invention is to provide a method for controlling a thread hooking mechanism of a sewing machine, which improves the working efficiency and flexibility.
The invention provides a control method of a thread hooking mechanism of a sewing machine, wherein the thread hooking mechanism is matched with a cloth pricking mechanism positioned above the thread hooking mechanism, a driving source is respectively arranged in the cloth pricking mechanism and the thread hooking mechanism, a rotating shuttle in the thread hooking mechanism is driven by a first driving source to rotate, a machine needle in the cloth pricking mechanism is driven by a second driving source to reciprocate in the vertical direction, and the rotating speed ratio of a main shaft in the rotating shuttle to a main shaft in the cloth pricking mechanism is 1: 1; the idle area of the rotating shuttle comprises a deceleration area after the thread is off and an acceleration area before the thread hooking starts.
Preferably, the idle zone of the rotating shuttle further comprises a constant speed zone between the deceleration zone and the acceleration zone.
Preferably, the first drive source is a rotary drive device.
Preferably, the thread hooking mechanism comprises a lower shaft (8) with one end fixedly connected with the rotating shuttle, a first gear is arranged at the other end of the lower shaft (8), a second gear is arranged on an output shaft of the rotary driving device, and the first gear is in transmission connection with the second gear.
Preferably, the rotary hook is provided on an output shaft of the rotary drive device.
Preferably, the rotary drive device is a rotary electric machine with an adjustable rotational speed.
Preferably, an encoder is arranged in the rotary driving device, the encoder comprises a signal generating unit, a signal identifying unit and a signal converting unit, and the signal generating unit is mounted on an output shaft of the rotary driving device; the encoder and the rotary driving device are both connected with a controller.
The invention has the advantages that:
1. the rotating speed ratio of the rotating shuttle to the main shaft is reduced from 2:1 to 1:1, the working load of the rotating shuttle is greatly reduced, and the service life can be greatly prolonged;
2. the thread hooking mechanism and the cloth pricking mechanism are driven by independent driving sources, so that the matching time sequence between the rotating shuttle 7 and the machine needle 6 is adjustable, namely the numerical value of the lifting height delta H can be adjusted by adjusting the running time sequence speed of the first driving source relative to the second driving source, and the thickness adaptability of the machine is greatly improved;
3. the idle area proportion of the rotating shuttle during working is greatly reduced, and the range of the uniform speed area can be adjusted by respectively arranging the deceleration area, the uniform speed area and the acceleration area, so that the working efficiency is effectively improved.
Drawings
FIG. 1 is a schematic structural diagram of a conventional cloth needling mechanism and a conventional thread hooking mechanism;
FIG. 2 is an exploded view of the thread hooking process;
FIG. 3 is a schematic view of the operating range of a conventional rotating shuttle;
FIG. 4 is a schematic view of the lift back height;
FIG. 5 is a schematic structural view of the cloth needling mechanism and the thread hooking mechanism of the present invention;
FIG. 6 is a schematic view of the operating range of the rotary shuttle of the present invention;
fig. 7 is a schematic diagram of the moving state of the rotating shuttle in the idle area according to the present invention (including a constant speed state);
fig. 8 is a schematic diagram of the moving state of the rotating shuttle in the idle area (not including the constant speed state) according to the present invention;
fig. 9 is a schematic diagram of the structure of the encoder.
Element number description:
1 spindle
2 needle bar crank
3 connecting rod
4 connecting column
5 needle bar
6 machine needle
61 wire loop
62 needle plate hole
7 rotating shuttle
71 shuttle point
8 lower shaft
91 first gear set
92 second gear set
10 vertical axis
11 rotation driving device
111 output shaft
121 first gear
122 second gear
13 synchronous belt
14 encoder
141 signal generating unit
142 signal identification unit
143 signal conversion unit
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "vertical", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention provides a control method of a thread hooking mechanism of a sewing machine, wherein the thread hooking mechanism is matched with a thorn cloth mechanism positioned above the thread hooking mechanism; the second driving source drives a main shaft in the cloth pricking mechanism to rotate, and the main shaft drives a machine needle to reciprocate along the vertical direction through a needle rod crank, a connecting rod, a connecting column, a needle rod and other components, so that the cloth pricking function is realized. In the technical scheme of the invention, the driving sources in the thread hooking mechanism and the cloth pricking mechanism respectively and independently work, so that the matching time sequence between the rotating shuttle and the machine needle is adjustable, namely the numerical value of the lifting height delta H can be adjusted by adjusting the running time sequence of the first driving source relative to the second driving source.
As shown in fig. 5, in an embodiment of the present invention, the thread hooking mechanism includes a rotary driving device 11 as a first driving source, a lower shaft 8 and a rotary shuttle 7, one end of the lower shaft 8 is fixedly connected to the rotary shuttle 7, the other end is provided with a first gear 121, an output shaft 111 of the rotary driving device 11 is provided with a second gear 122, and the first gear 121 and the second gear 122 are in transmission connection through a synchronous belt 13. Those skilled in the art can change the transmission structure between the rotary driving device 11 and the rotary shuttle 7 according to the requirement in the present invention, and besides the synchronous pulley in the above embodiment, the transmission connection can also be realized by adopting different forms such as spur gear, bevel gear, etc. or link transmission, etc., or the lower shaft 8 is removed, the output shaft of the rotary driving device 11 is directly connected with the rotary shuttle 7, and the rotary driving device 11 directly drives the rotary shuttle 7 to rotate.
As shown in fig. 6, since the thread hooking mechanism is driven by an independent driving source, the rotating speed ratio of the rotating shuttle 7 to the main shaft 1 in the cloth pricking mechanism can be reduced from 2:1 to 1:1, but the working area of the rotating shuttle 7 is still kept consistent with that before, as shown in fig. 6. When the main shaft 1 rotates for a circle (360 degrees), the rotating shuttle 7 rotates for a circle (360 degrees) in the same way, and the effective working area accounts for two thirds of the total period, so that the idle area of the rotating shuttle 7 is greatly shortened, and the working efficiency is improved. Preferably, the rotary drive means 11 is a rotary motor with an adjustable rotational speed, on the basis of which, as shown in fig. 7, the idle zone of the rotary shuttle 7 can be divided into three speed zones, namely a deceleration zone (phi 1-phi 2), a uniform velocity zone (phi 2-phi 3) and an acceleration zone (phi 3-360 deg./0 deg., wherein 180 deg. ≦ phi 1 ≦ 270 deg., 270 deg. ≦ phi 2< phi 3 ≦ 360 deg.. Specifically, the rotating shuttle 7 enters the deceleration zone under the action of the rotary driving device 11 at a certain time after the thread off is completed (when the rotating shuttle 7 rotates to the position of phi 1), the rotating speed is reduced, and then enters the uniform speed zone from the deceleration zone (when the rotating shuttle 7 rotates to the position of phi 2), and the rotating shuttle 7 rotates at a relatively low rotating speed at a uniform speed in the uniform speed zone. When the needle 6 descends to a specified position before the start of thread hooking (when the rotating shuttle 7 rotates to a position of phi 3), the rotating shuttle 7 enters an acceleration region, and when the rotating shuttle rotates to a position of 0 DEG (namely, an initial position), the shuttle tip 71 coincides with the needle 6, and thread hooking is started.
According to different conditions of each machine model, rotating shuttle type, machine needle model and the like, the range of the uniform speed area can be correspondingly adjusted, or as shown in figure 8, the idle area does not contain the uniform speed area, so that the rotating shuttle 7 enters a deceleration area (phi 1-phi 3) and an acceleration area (phi 3-360 DEG/0 DEG) respectively under the action of the rotary driving device 11 after the thread is taken off, wherein phi 1 is more than or equal to 180 DEG and less than or equal to 270 DEG, and phi 3 is more than or equal to 270 DEG and less than or equal to 360 deg. The rotating shuttle 7 starts to enter the deceleration zone at a certain time (the rotating shuttle 7 rotates to the position of phi 1) after the thread off is finished, and the rotating speed is gradually reduced. When the needle 6 descends to a designated position before the start of thread hooking (when the rotating shuttle 7 rotates to a position of phi 3), the rotating shuttle 7 enters an acceleration region, and when the rotating shuttle rotates to a position of 0 DEG (namely, an initial position), the shuttle tip 71 is overlapped with the needle 6 to start thread hooking.
As shown in fig. 5 and 9, the encoder 14 is disposed in the rotation driving device 11, the encoder 14 includes a signal generating unit 141, a signal recognizing unit 142 and a signal converting unit 143, the signal generating unit 141 is mounted on the output shaft 111 of the rotation driving device 11 and generates an angular displacement signal along with the rotation of the output shaft 111, the signal recognizing unit 142 is used for recognizing the angular displacement signal and transmitting the signal to the signal converting unit 143, and the signal converting unit 143 can convert the angular displacement signal into an electrical signal.
The encoder 14 and the rotary drive 11 are connected to a control unit. Because the angular displacement information generated by the signal generating unit 141 in the encoder 14 has a certain corresponding relationship with the rotation angle of the rotating shuttle 7, the encoder 14 can feed back the current rotation angle of the rotating shuttle 7 to the controller in real time, the controller judges whether the rotating shuttle 7 enters a deceleration area, a uniform speed area or an acceleration area, and the controller outputs a forward or reverse voltage to the rotation driving device 11 through the driving circuit, so as to realize acceleration or deceleration of the rotation driving device 11.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (7)
1. A control method of a thread hooking mechanism of a sewing machine is characterized in that the thread hooking mechanism is matched with a cloth pricking mechanism positioned above the thread hooking mechanism,
the cloth pricking mechanism and the thread hooking mechanism are respectively provided with a driving source, a rotating shuttle (7) in the thread hooking mechanism rotates under the driving of a first driving source, a needle (6) in the cloth pricking mechanism reciprocates in the vertical direction under the driving of a second driving source, and the rotating speed ratio of the rotating shuttle (7) to a main shaft (1) in the cloth pricking mechanism is 1: 1;
the idle area of the rotating shuttle (7) comprises a deceleration area after the thread is off and an acceleration area before the thread hooking starts.
2. A control method according to claim 1, characterized in that the idle zone of the rotating shuttle (7) further comprises a uniform velocity zone between the deceleration zone and the acceleration zone.
3. A control method according to claim 1, characterized in that the first drive source is a rotary drive (11).
4. The control method according to claim 3, characterized in that the thread hooking mechanism comprises a lower shaft (8) with one end fixedly connected with the rotating shuttle (7), the other end of the lower shaft (8) is provided with a first gear (121), the output shaft (111) of the rotary driving device (11) is provided with a second gear (122), and the first gear (121) and the second gear (122) are in transmission connection.
5. A control method according to claim 3, characterized in that the rotary shuttle (7) is arranged on an output shaft (111) of the rotary drive means (11).
6. A control method according to claim 3, characterized in that the rotary drive (11) is a rotary electric machine with adjustable rotational speed.
7. The control method according to claim 3, characterized in that an encoder (14) is provided in the rotary drive device (11), the encoder (14) includes a signal generation unit (141), a signal identification unit (142) and a signal conversion unit (143), the signal generation unit (141) is mounted on an output shaft (111) of the rotary drive device (11); the encoder (14) and the rotary drive device (11) are connected with a controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110204250.7A CN114960055A (en) | 2021-02-23 | 2021-02-23 | Control method of thread hooking mechanism of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110204250.7A CN114960055A (en) | 2021-02-23 | 2021-02-23 | Control method of thread hooking mechanism of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114960055A true CN114960055A (en) | 2022-08-30 |
Family
ID=82973537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110204250.7A Pending CN114960055A (en) | 2021-02-23 | 2021-02-23 | Control method of thread hooking mechanism of sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114960055A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1136610A (en) * | 1995-02-09 | 1996-11-27 | 兄弟工业株式会社 | Sewing machine |
| JPH10290894A (en) * | 1997-04-17 | 1998-11-04 | Hirose Mfg Co Ltd | Vertical full rotation shuttle |
| JP2003117276A (en) * | 2001-10-12 | 2003-04-22 | Juki Corp | Sewing machine |
| CN207699814U (en) * | 2017-12-28 | 2018-08-07 | 拓卡奔马机电科技有限公司 | Lockstitch button holder driving mechanism |
| CN109594235A (en) * | 2017-09-30 | 2019-04-09 | 杰克缝纫机股份有限公司 | A kind of sewing machine |
| CN110714282A (en) * | 2019-11-15 | 2020-01-21 | 拓卡奔马机电科技有限公司 | System and method for controlling upper shaft and lower shaft of sewing machine to synchronously rotate by electronic hand wheel |
| CN111118761A (en) * | 2018-11-01 | 2020-05-08 | 天津宝盈电脑机械有限公司 | Control mechanism for synchronous electric control signal of machine head and rotating shuttle |
| CN111118758A (en) * | 2018-10-31 | 2020-05-08 | 拓卡奔马机电科技有限公司 | Needle and shuttle cooperation automatic regulating mechanism and sewing machine |
| CN111118759A (en) * | 2018-10-31 | 2020-05-08 | 拓卡奔马机电科技有限公司 | Needle and shuttle cooperation automatic regulating mechanism and sewing machine |
| CN211199664U (en) * | 2019-11-15 | 2020-08-07 | 拓卡奔马机电科技有限公司 | System for controlling upper shaft and lower shaft of sewing machine to synchronously rotate by electronic hand wheel |
-
2021
- 2021-02-23 CN CN202110204250.7A patent/CN114960055A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1136610A (en) * | 1995-02-09 | 1996-11-27 | 兄弟工业株式会社 | Sewing machine |
| JPH10290894A (en) * | 1997-04-17 | 1998-11-04 | Hirose Mfg Co Ltd | Vertical full rotation shuttle |
| JP2003117276A (en) * | 2001-10-12 | 2003-04-22 | Juki Corp | Sewing machine |
| CN109594235A (en) * | 2017-09-30 | 2019-04-09 | 杰克缝纫机股份有限公司 | A kind of sewing machine |
| CN207699814U (en) * | 2017-12-28 | 2018-08-07 | 拓卡奔马机电科技有限公司 | Lockstitch button holder driving mechanism |
| CN111118758A (en) * | 2018-10-31 | 2020-05-08 | 拓卡奔马机电科技有限公司 | Needle and shuttle cooperation automatic regulating mechanism and sewing machine |
| CN111118759A (en) * | 2018-10-31 | 2020-05-08 | 拓卡奔马机电科技有限公司 | Needle and shuttle cooperation automatic regulating mechanism and sewing machine |
| CN111118761A (en) * | 2018-11-01 | 2020-05-08 | 天津宝盈电脑机械有限公司 | Control mechanism for synchronous electric control signal of machine head and rotating shuttle |
| CN110714282A (en) * | 2019-11-15 | 2020-01-21 | 拓卡奔马机电科技有限公司 | System and method for controlling upper shaft and lower shaft of sewing machine to synchronously rotate by electronic hand wheel |
| CN211199664U (en) * | 2019-11-15 | 2020-08-07 | 拓卡奔马机电科技有限公司 | System for controlling upper shaft and lower shaft of sewing machine to synchronously rotate by electronic hand wheel |
Non-Patent Citations (1)
| Title |
|---|
| 孙苏榕等: "服装机械原理与设计", 中国纺织大学出版社, pages: 138 - 140 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108998899B (en) | Automatic improve work feed mechanism of receiving line | |
| CN108396468B (en) | Dual-motor driving feeding device of sewing machine | |
| CN114960055A (en) | Control method of thread hooking mechanism of sewing machine | |
| CN1536118A (en) | Sewing machine and recording medium recorded with pulse electric machine control program | |
| CN111020902A (en) | Needle bar rotating template machine | |
| CN214458736U (en) | Independently driven thread hooking mechanism of sewing machine | |
| CN212404438U (en) | Overedger's feeding mechanism | |
| CN203700723U (en) | Sewing machine and flexible middle presser foot driving mechanism thereof | |
| CN111206342A (en) | Automatic cutting equipment with label cloth | |
| WO2021135199A1 (en) | Sewing machine feeding mechanism and sewing machine having sewing machine feeding mechanism | |
| CN208259193U (en) | A kind of side-sewing machine | |
| CN110629424A (en) | Carpet machine | |
| CN219568257U (en) | Split type shuttleless sewing machine head for four-side sewing | |
| CN217869414U (en) | Overedger | |
| WO2021128842A1 (en) | Feeding mechanism of sewing machine and sewing machine comprising feeding mechanism | |
| CN220867672U (en) | Feeding mechanism of sewing machine and sewing machine with feeding mechanism | |
| CN218861083U (en) | Rotating device and sewing machine | |
| CN220812867U (en) | Step feeding tooth adjusting device | |
| CN217895925U (en) | Cam mechanism for controlling needle pitch by stepping motor | |
| CN216809196U (en) | Stitch switching mechanism of sewing machine | |
| CN218910739U (en) | Dual-motor cloth dragging wheel device | |
| CN215829016U (en) | Feed dog driving mechanism of sewing machine | |
| CN218812545U (en) | Feeding mechanism for sewing machine | |
| CN216338291U (en) | Feeding mechanism of sewing machine and sewing machine with feeding mechanism | |
| CN209816437U (en) | Preset cloth feeding rolling belt presser foot of lockstitch sewing machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |