CN203513993U - Automatic replacement device for bottom yarn of sewing machine - Google Patents
Automatic replacement device for bottom yarn of sewing machine Download PDFInfo
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- CN203513993U CN203513993U CN201320389498.6U CN201320389498U CN203513993U CN 203513993 U CN203513993 U CN 203513993U CN 201320389498 U CN201320389498 U CN 201320389498U CN 203513993 U CN203513993 U CN 203513993U
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- peg
- spindle
- sewing machine
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Abstract
The utility model provides an automatic replacement device for bottom yarn of a sewing machine. The automatic replacement device comprises a bobbin feeding mechanism used for arranging bobbins sequentially and conveying the bobbins to an auxiliary feeding mechanism, the auxiliary feeding mechanism used for carrying out moving on the bobbins conveyed by the bobbin feeding mechanism and carrying out feeding on the bobbins provided by a bobbin claw structure, the bobbin claw structure used for grabbing the bobbins conveyed by the auxiliary feeding mechanism and carrying out loading, and an execution driving device used for carrying out position moving on the bobbin claw structure and achieving loading of the bobbins. According to the automatic replacement device for the bottom yarn of the sewing machine, the bobbins can be automatically replaced after the bottom yarn of the sewing machine is used up, the bottom yarn can be supplemented, and therefore continuous work of the sewing machine can be guaranteed. Due to the fact that the bobbins can be automatically replaced, the bottom yarn can be quickly and automatically replaced, the storage number of the bobbins is large, and sewing equipment is high in operation continuity and efficiency.
Description
Technical field
The utility model relates to a kind of bobbin thread for sewing machine apparatus for automatic change.
Background technology
When common Sewing machines is sewed, on sewing, form lock-type chain stitch, general lock-type chain stitch is intertwined to form by string-hooking mechanism by bottom line and upper thread.Upper thread can be by the supply for a long time continuously of outside tower line, and bottom line is to be wrapped on the peg or spindle of rotating shuttle or shuttle, and limited length must manually be changed peg or spindle after using.Existing industrial flat bed sewing machine all needs to shut down after work a period of time changes the supplementary bottom line of peg or spindle, can greatly reduce like this production efficiency of equipment, even causes the production capacity of production equipment lower than sewn by hand, makes the research and development of automatic producing device lose meaning.Traditional way is to use based on hand labour to change peg or spindle, so labour intensity is high, and speed is slow, inefficiency.
The problems referred to above are the problems that should pay attention to and solve in the bottom line Renewal process when Sewing machines is sewed.
Utility model content
The purpose of this utility model is to provide a kind of bobbin thread for sewing machine apparatus for automatic change and solves existing industrial flat bed sewing machine and in work, all need after a period of time to shut down and change peg or spindle and supplement bottom line; and it is high to exist labour intensity based on hand labour replacing peg or spindle; speed is slow, the problem of inefficiency.
Technical solution of the present utility model is:
A bobbin thread for sewing machine apparatus for automatic change, comprises
-to peg or spindle, be arranged in order and carry peg or spindle to the peg or spindle feed mechanism of auxiliary feeding device,
The auxiliary feeding device that-peg or spindle that peg or spindle feed mechanism is carried moves, provide peg or spindle to carry out material loading for peg or spindle pawl structure,
-for capturing peg or spindle that auxiliary feeding device transports the peg or spindle pawl structure of material loading,
-for peg or spindle pawl structure is carried out to the Execution driven device that peg or spindle material loading is moved to realize in position.
Preferably, described peg or spindle feed mechanism comprises peg or spindle storehouse, the first base, vibration motor, Rubber shock-absorbing pad and slide rail, described the first base is provided with vibration motor, described the first base is connected on fixed mount by Rubber shock-absorbing pad, described peg or spindle storehouse is fixed on the first base, described peg or spindle is provided with spiral helicine track in storehouse, described track connecting sliding rail.
Preferably, described auxiliary feeding device comprises horizontal feeding guide, lateral cylinder, approach switch, longitudinal feeding guide, longitudinal cylinder, oscillating feed box and oscillating cylinder, described horizontal feeding guide connects described slide rail, the end of described horizontal feeding guide is provided with lateral cylinder, described approach switch is located at the top of horizontal feeding guide, described longitudinal feeding guide connects horizontal feeding guide, one end of described longitudinal feeding guide is provided with longitudinal cylinder, the other end of described longitudinal cylinder connects oscillating feed box, and described oscillating feed box is connected with oscillating cylinder.
Preferably, described peg or spindle pawl mechanism comprises chuck, shuttle claw lever, is connected and fixed plate, peg or spindle pawl cylinder and chuck fixed head, described chuck is fixed on and is connected and fixed on plate, the described plate that is connected and fixed is fixed on chuck fixed head, described chuck is provided with shuttle claw lever, and described peg or spindle pawl cylinder is located at and is connected and fixed on plate.
Preferably, described Execution driven device comprises stepper motor, upper end shaft coupling, bearing block, sole plate of workbench, rotating shaft, lead screw motor, lower end shaft coupling, screw mandrel, screw mandrel supporting seat, guide rail and the second base, described stepper motor connects rotating shaft by upper end shaft coupling, the end connecting chuck fixed head of described rotating shaft, described rotating shaft is supported by bearing block, described bearing block is located on sole plate of workbench, described sole plate of workbench is located on guide rail, described guide rail is fixed on the second base, described lead screw motor is by lower end shaft coupling connection wire rod, described screw mandrel is fixed on screw mandrel supporting seat.
Preferably, described chuck fixed head is provided with peg or spindle the peg or spindle pawl structure one of material loading and the peg or spindle pawl structure two also reclaiming for the old peg or spindle capturing after sewing is used of transporting in peg or spindle storehouse for capturing.
Preferably, described peg or spindle feed mechanism connects auxiliary feeding device by slide rail, and described peg or spindle pawl structure is located at the end of auxiliary feeding device, and described Execution driven device connects peg or spindle pawl structure by chuck.
A kind of bobbin thread for sewing machine apparatus for automatic change of the utility model, in peg or spindle feed mechanism, helical track is made in inside, peg or spindle storehouse, this helical track is connected with slide rail, in bottom, peg or spindle storehouse, one side is provided with groove, when placing peg or spindle, this groove can be blocked and prevents peg or spindle landing with dividing plate, after material loading completes, just dividing plate be taken away, now peg or spindle dense arrangement in slide rail.
After replacing peg or spindle process starts automatically, approach switch in assistant feeding device starts to detect, if generation signal, represent to have peg or spindle in horizontal feeding guide, lateral cylinder pushes peg or spindle in longitudinal feeding guide, if can't detect signal, represent that the feeding of peg or spindle feed mechanism is unsuccessful, now control the vibration motor vibrations of bottom, peg or spindle storehouse, making peg or spindle gravitate slide slide rail enters in horizontal feeding guide, because the vibration amplitude of needs is less, in bottom, peg or spindle storehouse, Rubber shock-absorbing pad is installed.
After peg or spindle enters in longitudinal feeding guide, longitudinally cylinder pushes peg or spindle in oscillating feed box, and oscillating feed box swing under the effect of oscillating cylinder is waited for the crawl of peg or spindle pawl.The lead screw motor forward in Execution driven device now, sole plate of workbench direction to lead screw motor on guide rail moves, the chuck fixed head on rotating shaft top is along with sole plate of workbench together translation, chuck is near the peg or spindle in oscillating feed box, sole plate of workbench arrives assigned address, chuck props up peg or spindle, peg or spindle pawl cylinder starts to promote the lever in shuttle claw lever, effect due to connecting rod, shuttle pawl is scratched the peg or spindle lid on peg or spindle to open, and the fixation by chuck and shuttle claw lever captures the peg or spindle in oscillating feed box.The now reversion of the lead screw motor in Execution driven device, sole plate of workbench direction away from lead screw motor on guide rail moves, and chuck and shuttle claw lever clip peg or spindle away from oscillating feed box.
In order to increase work efficiency, two peg or spindle pawl mechanisms have been installed on chuck fixed head, one is for capturing the peg or spindle pawl mechanism one of the peg or spindle material loading transporting in peg or spindle storehouse, the peg or spindle pawl mechanism two that then another abandon for capturing the used old peg or spindle of sewing device.Chuck and shuttle claw lever clip peg or spindle away from oscillating feed box after, stepper motor is by shaft coupling driven rotary axle swing, now chuck holder has also rotated degree, use untapped peg or spindle pawl above to adopt identical method to capture the peg or spindle that sewing device place uses, then stepper motor is by shaft coupling driven rotary axle swing, chuck and shuttle claw lever clip peg or spindle close Sewing machines under the effect of lead screw motor, arrive behind Sewing machines position, peg or spindle pawl cylinder is return peg or spindle is unclamped, peg or spindle has been put Sewing machines thus into, and used peg or spindle has fallen in the peg or spindle recovery frame of bottom in the effect of returning of peg or spindle pawl cylinder.After having changed peg or spindle, all parts are all kept in the center, and wait for shuttle changing core next time.
The beneficial effects of the utility model are: a kind of bobbin thread for sewing machine apparatus for automatic change of the utility model, and can after being finished, bobbin thread for sewing machine can automatically for it, change peg or spindle, supplement bottom line, to guarantee carrying out continuously of sewing work.Due to can automatic shuttle changing, realized the fast automatic line that refoots of Sewing machines, and peg or spindle warehousing reserves are large, make sewing device operation continuity high, efficiency is high.This kind of bobbin thread for sewing machine apparatus for automatic change can adopt PLC computer electric control device centralized Control, by the higher stepper motor carrier of precision, makes action compact, accurately.
Accompanying drawing explanation
Fig. 1 is the cross-sectional structural representation of the utility model embodiment;
Fig. 2 is the vertical profile structural representation of the utility model embodiment;
Wherein: 1-peg or spindle feed mechanism, 2-peg or spindle storehouse, 3-the first base, 4-vibration motor, 5-Rubber shock-absorbing pad, 6-slide rail, 7-auxiliary feeding device, the horizontal feeding guide of 8-, 9-lateral cylinder, 10-approach switch, the longitudinal feeding guide of 11-, the longitudinal cylinder of 12-, 13-oscillating feed box, 14-oscillating cylinder, 15-peg or spindle pawl structure, 16-chuck, 17-shuttle claw lever, 18-is connected and fixed plate, 19-peg or spindle pawl cylinder, 20-chuck fixed head, 21-Execution driven device, 22-stepper motor, 23-upper end shaft coupling, 24-bearing block, 25-sole plate of workbench, 26-rotating shaft, 27-lead screw motor, 28-lower end shaft coupling, 29-screw mandrel, 30-screw mandrel supporting seat, 31-guide rail, 32-the second base.
The specific embodiment
Below in conjunction with accompanying drawing, describe preferred embodiment of the present utility model in detail.
As depicted in figs. 1 and 2, the present embodiment provides a kind of bobbin thread for sewing machine apparatus for automatic change, comprise and be arranged in order and carry peg or spindle to the peg or spindle feed mechanism 1 of auxiliary feeding device 7 to peg or spindle, the auxiliary feeding device 7 that the peg or spindle that peg or spindle feed mechanism 1 is carried moves, provide peg or spindle to carry out material loading for peg or spindle pawl structure 15, for capturing peg or spindle that auxiliary feeding device 7 transports the peg or spindle pawl structure 15 of material loading, for peg or spindle pawl structure 15 is carried out to the Execution driven device 21 that peg or spindle material loading is moved to realize in position.
Described peg or spindle feed mechanism 1 comprises peg or spindle storehouse 2, the first base 3, vibration motor 4, Rubber shock-absorbing pad 5 and slide rail 6, described the first base 3 is provided with vibration motor 4, described the first base 3 is connected on fixed mount by Rubber shock-absorbing pad 5, described peg or spindle storehouse 2 is fixed on the first base 3, in described peg or spindle storehouse 2, be provided with spiral helicine track, described track connecting sliding rail 6.
Described auxiliary feeding device 7 comprises horizontal feeding guide 8, lateral cylinder 9, approach switch 10, longitudinal feeding guide 11, longitudinal cylinder 12, oscillating feed box 13 and oscillating cylinder 14, described horizontal feeding guide 8 connects described slide rail 6, the end of described horizontal feeding guide 8 is provided with lateral cylinder 9, described approach switch 10 is located at the top of horizontal feeding guide 8, described longitudinal feeding guide 11 connects horizontal feeding guide 8, one end of described longitudinal feeding guide 11 is provided with longitudinal cylinder 12, the other end of described longitudinal cylinder 12 connects oscillating feed box 13, described oscillating feed box 13 is connected with oscillating cylinder 14.
Described peg or spindle pawl mechanism comprises chuck 16, shuttle claw lever 17, is connected and fixed plate 18, peg or spindle pawl cylinder 19 and chuck fixed head 20, described chuck 16 is fixed on and is connected and fixed on plate 18, the described plate 18 that is connected and fixed is fixed on chuck fixed head 20, described chuck 16 is provided with shuttle claw lever 17, and described peg or spindle pawl cylinder 19 is located at and is connected and fixed on plate 18.
Described Execution driven device 21 comprises stepper motor 22, upper end shaft coupling 23, bearing block 24, sole plate of workbench 25, rotating shaft 26, lead screw motor 27, lower end shaft coupling 28, screw mandrel 29, screw mandrel supporting seat 30, guide rail 31 and the second base 32, described stepper motor 22 connects rotating shaft 26 by upper end shaft coupling 23, the end connecting chuck fixed head 20 of described rotating shaft 26, described rotating shaft 26 is supported by bearing block 24, described bearing block 24 is located on sole plate of workbench 25, described sole plate of workbench 25 is located on guide rail 31, described guide rail 31 is fixed on the second base 32, described lead screw motor 27 is by lower end shaft coupling 28 connection wire rods 29, described screw mandrel 29 is fixed on screw mandrel supporting seat 30.
Described chuck fixed head 20 is provided with peg or spindle the peg or spindle pawl structure one of material loading and the peg or spindle pawl structure two also reclaiming for the old peg or spindle capturing after sewing is used of transporting in peg or spindle storehouse 2 for capturing.
Described peg or spindle feed mechanism 1 connects auxiliary feeding device 7 by slide rail 6, and described peg or spindle pawl structure 15 is located at the end of auxiliary feeding device 7, and described Execution driven device 21 connects peg or spindle pawl structure 15 by chuck 16.
A kind of bobbin thread for sewing machine apparatus for automatic change of the present embodiment, in peg or spindle feed mechanism 1, helical track is made in 2 inside, peg or spindle storehouse, this helical track is connected with slide rail 6, in peg or spindle storehouse, 2 bottom one sides are provided with groove, when placing peg or spindle, this groove can be blocked and prevents peg or spindle landing with dividing plate, after material loading completes, just dividing plate be taken away, now peg or spindle is in the interior dense arrangement of slide rail 6.
After replacing peg or spindle process starts automatically, approach switch 10 in assistant feeding device starts to detect, if generation signal, represent the interior peg or spindle that exists of horizontal feeding guide 8, lateral cylinder 9 pushes peg or spindle in longitudinal feeding guide 11, if can't detect signal, represent that 1 feeding of peg or spindle feed mechanism is unsuccessful, now control vibration motor 4 vibrations of 2 bottoms, peg or spindle storehouse, making peg or spindle gravitate slide slide rail 6 enters in horizontal feeding guide 8, because the vibration amplitude of needs is less, in 2 bottoms, peg or spindle storehouse, Rubber shock-absorbing pad 5 is installed.
After peg or spindle enters in longitudinal feeding guide 11, longitudinally cylinder 12 pushes peg or spindle in oscillating feed box 13, and oscillating feed box 13 swing under the effect of oscillating cylinder 14 is waited for the crawl of peg or spindle pawl.Lead screw motor 27 forwards in Execution driven device 21 now, sole plate of workbench 25 moves to the direction of lead screw motor 27 on guide rail 31, the chuck fixed head 20 on rotating shaft 26 tops is along with sole plate of workbench 25 together translation, chuck 16 is near the peg or spindle in oscillating feed box 13, sole plate of workbench 25 arrives assigned address, chuck 16 props up peg or spindle, peg or spindle pawl cylinder 19 starts to promote the lever in shuttle claw lever 17, effect due to connecting rod, shuttle pawl is scratched the peg or spindle lid on peg or spindle to open, fixation by chuck 16 and shuttle claw lever 17 captures the peg or spindle in oscillating feed box 13.Now 27 reversions of the lead screw motor in Execution driven device 21, sole plate of workbench 25 moves away from the direction of lead screw motor 27 on guide rail 31, and chuck 16 and shuttle claw lever 17 clip peg or spindle away from oscillating feed box 13.
In order to increase work efficiency, two peg or spindle pawl mechanisms have been installed on chuck fixed head 20, one is for capturing the peg or spindle pawl mechanism one of the peg or spindle material loading transporting in peg or spindle storehouse 2, the peg or spindle pawl mechanism two that then another abandon for capturing the used old peg or spindle of sewing device.Chuck 16 and shuttle claw lever 17 clip peg or spindle away from oscillating feed box 13 after, stepper motor 22 is by shaft coupling driven rotary axle 26 swings, now chuck 16 holders have also rotated degree, use untapped peg or spindle pawl above to adopt identical method to capture the peg or spindle that sewing device place uses, then stepper motor 22 is by shaft coupling driven rotary axle 26 swings, chuck 16 and shuttle claw lever 17 clip peg or spindle close Sewing machines under the effect of lead screw motor 27, arrive behind Sewing machines position, peg or spindle pawl cylinder 19 is return peg or spindle is unclamped, peg or spindle has been put Sewing machines thus into, and used peg or spindle has fallen in the peg or spindle recovery frame of bottom in the effect of returning of peg or spindle pawl cylinder 19.After having changed peg or spindle, all parts are all kept in the center, and wait for shuttle changing core next time.
The beneficial effect of the present embodiment is: a kind of bobbin thread for sewing machine apparatus for automatic change of the present embodiment, and can after being finished, bobbin thread for sewing machine can automatically for it, change peg or spindle, supplement bottom line, to guarantee carrying out continuously of sewing work.Due to can automatic shuttle changing, realized the fast automatic line that refoots of Sewing machines, and peg or spindle warehousing reserves are large, make sewing device operation continuity high, efficiency is high.This kind of bobbin thread for sewing machine apparatus for automatic change can adopt PLC computer electric control device centralized Control, by the higher stepper motor carrier of precision, makes action compact, accurately.
In addition to the implementation, the utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of the utility model requirement.
Claims (7)
1. a bobbin thread for sewing machine apparatus for automatic change, is characterized in that, comprises
-to peg or spindle, be arranged in order and carry peg or spindle to the peg or spindle feed mechanism (1) of auxiliary feeding device (7),
-peg or spindle of peg or spindle feed mechanism (1) conveying is moved, is the auxiliary feeding device (7) that peg or spindle pawl structure (15) provides peg or spindle to carry out material loading,
-for capturing peg or spindle that auxiliary feeding device (7) transports the peg or spindle pawl structure (15) of material loading,
-for peg or spindle pawl structure (15) being carried out to the Execution driven device (21) that peg or spindle material loading is moved to realize in position.
2. bobbin thread for sewing machine apparatus for automatic change as claimed in claim 1, it is characterized in that: described peg or spindle feed mechanism (1) comprises peg or spindle storehouse (2), the first base (3), vibration motor (4), Rubber shock-absorbing pad (5) and slide rail (6), described the first base (3) is provided with vibration motor (4), described the first base (3) is connected on fixed mount by Rubber shock-absorbing pad (5), described peg or spindle storehouse (2) is fixed on the first base (3), in described peg or spindle storehouse (2), be provided with spiral helicine track, described track connecting sliding rail (6).
3. bobbin thread for sewing machine apparatus for automatic change as claimed in claim 2, it is characterized in that: described auxiliary feeding device (7) comprises horizontal feeding guide (8), lateral cylinder (9), approach switch (10), longitudinal feeding guide (11), longitudinal cylinder (12), oscillating feed box (13) and oscillating cylinder (14), described horizontal feeding guide (8) connects described slide rail (6), the end of described horizontal feeding guide (8) is provided with lateral cylinder (9), described approach switch (10) is located at the top of horizontal feeding guide (8), described longitudinal feeding guide (11) connects horizontal feeding guide (8), one end of described longitudinal feeding guide (11) is provided with longitudinal cylinder (12), the other end of described longitudinal cylinder (12) connects oscillating feed box (13), described oscillating feed box (13) is connected with oscillating cylinder (14).
4. the bobbin thread for sewing machine apparatus for automatic change as described in claim 1-3 any one, it is characterized in that: described peg or spindle pawl mechanism comprises chuck (16), shuttle claw lever (17), is connected and fixed plate (18), peg or spindle pawl cylinder (19) and chuck fixed head (20), described chuck (16) is fixed on and is connected and fixed on plate (18), the described plate (18) that is connected and fixed is fixed on chuck fixed head (20), described chuck (16) is provided with shuttle claw lever (17), and described peg or spindle pawl cylinder (19) is located at and is connected and fixed on plate (18).
5. bobbin thread for sewing machine apparatus for automatic change as claimed in claim 4, it is characterized in that: described Execution driven device (21) comprises stepper motor (22), upper end shaft coupling (23), bearing block (24), sole plate of workbench (25), rotating shaft (26), lead screw motor (27), lower end shaft coupling (28), screw mandrel (29), screw mandrel supporting seat (30), guide rail (31) and the second base (32), described stepper motor (22) connects rotating shaft (26) by upper end shaft coupling (23), the end connecting chuck fixed head (20) of described rotating shaft (26), described rotating shaft (26) is supported by bearing block (24), described bearing block (24) is located on sole plate of workbench (25), described sole plate of workbench (25) is located on guide rail (31), described guide rail (31) is fixed on the second base (32), described lead screw motor (27) is by lower end shaft coupling (28) connection wire rod (29), described screw mandrel (29) is fixed on screw mandrel supporting seat (30).
6. bobbin thread for sewing machine apparatus for automatic change as claimed in claim 4, is characterized in that: described chuck fixed head (20) is provided with peg or spindle the peg or spindle pawl structure one of material loading and the peg or spindle pawl structure two also reclaiming for the old peg or spindle capturing after sewing is used of transporting in peg or spindle storehouse (2) for capturing.
7. the bobbin thread for sewing machine apparatus for automatic change as described in claim 1-3 any one, it is characterized in that: described peg or spindle feed mechanism (1) connects auxiliary feeding device (7) by slide rail (6), described peg or spindle pawl structure (15) is located at the end of auxiliary feeding device (7), and described Execution driven device (21) connects peg or spindle pawl structure (15) by chuck (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320389498.6U CN203513993U (en) | 2013-07-02 | 2013-07-02 | Automatic replacement device for bottom yarn of sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320389498.6U CN203513993U (en) | 2013-07-02 | 2013-07-02 | Automatic replacement device for bottom yarn of sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203513993U true CN203513993U (en) | 2014-04-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320389498.6U Withdrawn - After Issue CN203513993U (en) | 2013-07-02 | 2013-07-02 | Automatic replacement device for bottom yarn of sewing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203513993U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873819A (en) * | 2018-06-07 | 2018-11-23 | 浙江鹤群智能装备股份有限公司 | A kind of full-automatic control system of sewing machine shuttle peg processing machine |
-
2013
- 2013-07-02 CN CN201320389498.6U patent/CN203513993U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873819A (en) * | 2018-06-07 | 2018-11-23 | 浙江鹤群智能装备股份有限公司 | A kind of full-automatic control system of sewing machine shuttle peg processing machine |
| CN108873819B (en) * | 2018-06-07 | 2021-02-02 | 浙江勇峰智能科技有限公司 | Full-automatic control system of sewing machine shuttle peg processing machine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140402 Effective date of abandoning: 20140924 |
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| RGAV | Abandon patent right to avoid regrant |