CN104630993B - A kind of foot lifting mechanism of sewing machine - Google Patents

A kind of foot lifting mechanism of sewing machine Download PDF

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Publication number
CN104630993B
CN104630993B CN201510100538.4A CN201510100538A CN104630993B CN 104630993 B CN104630993 B CN 104630993B CN 201510100538 A CN201510100538 A CN 201510100538A CN 104630993 B CN104630993 B CN 104630993B
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China
Prior art keywords
presser feet
joint
transmission mechanism
casing
magnet
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CN201510100538.4A
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CN104630993A (en
Inventor
王名科
王志
陈彬
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Jack Technology Co Ltd
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Jack Sewing Machine Co Ltd
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Priority to CN201510100538.4A priority Critical patent/CN104630993B/en
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/10—Electrical or electromagnetic drives

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

The invention belongs to sewing machine technique field, refer in particular to a kind of foot lifting mechanism of sewing machine, include the first transmission mechanism and the second transmission mechanism, the first described transmission mechanism includes presser feet axle, the upper end of presser feet axle is connected with presser feet dog, one end of presser feet dog is arranged in the guide groove for the guide block being fixed in casing, and guide block limits the movement locus of presser feet dog, and lower end connection presser feet dog, upper end and the middle part of presser foot lifter lifter plate are hinged on the preceding lever connection of the presser feet crank on casing；The second described transmission mechanism includes driver, connected between first transmission mechanism and the second transmission mechanism by flexible strand, one end of flexible strand is connected with the rear lever of presser feet crank, the expansion link of the other end and driver connects, structure optimization of the present invention, using flexible connection between first transmission mechanism and the second transmission mechanism, and the connecting place of sleeve pipe and casing is tightly connected, the leakage problem of machine oil can be efficiently solved；Reduce the use cost of electromagnet.

Description

A kind of foot lifting mechanism of sewing machine
Technical field：
The invention belongs to sewing machine technique field, refers in particular to a kind of foot lifting mechanism of sewing machine.
Background technology：
The course of work of existing mechanism for lifting pressre of sewing machine is as follows：Presser foot lifter spanner is pulled, passes through the first transmission mechanism Transfer force on the first crank, then transferred force to by toggle on a longer feed lifting rock shaft and change into torsion Power, finally torsion is lifted presser feet axle by the second toggle, so as to realize that presser foot lifter works.
There is following weak point for above-mentioned foot lifting mechanism：First, structure is complex, and assembling is cumbersome；Its Secondary, the requirement to the part accuracy of manufacture is higher, and especially feed lifting rock shaft will pass through four holes on casing, then to the same of this four holes Heart degree requires very high, therefore higher requirement is proposed to the machining accuracy of casing and feed lifting rock shaft；Therefore, lifting presser feet axle just needs Bigger strength is needed because overcoming resistance；In addition, when using electromagnetism iron fitting, then electromagnet is arranged on outside casing Portion, electromagnet is exposed to cause machine to carry inconvenience, while the aesthetics of the overall appearance of machine affects.
Meanwhile it is spacing, which to lift pressing plate, for existing sewing machine is realized by the elastic force of spring (torsion spring or extension spring).Spring Active force all the time during whole lift pressure, the restoring force of spring strengthens as the lifting of height is pressed in lift, it is therefore desirable to Larger presser foot lifter electromagnetism rated attraction force.
The content of the invention：
It is an object of the invention to provide a kind of simplified transmission series, reduce to the sewing machine of the requirement on machining accuracy of part Foot lifting mechanism.
What the present invention was realized in：
A kind of foot lifting mechanism of sewing machine, include the first transmission mechanism and the second transmission mechanism, described first passes Motivation structure includes presser feet axle, and the upper end of presser feet axle is connected with presser feet dog, and one end of presser feet dog, which is arranged on, is fixed on casing In the guide groove of interior guide block, the movement locus of guide block limitation presser feet dog, the lower end connection presser feet dog of presser foot lifter lifter plate, The preceding lever for the presser feet crank that upper end is hinged on casing with middle part is connected；The second described transmission mechanism includes driver, Connected between first transmission mechanism and the second transmission mechanism by flexible strand, one end of flexible strand connects with the rear lever of presser feet crank Connect, the expansion link of the other end and driver connects.
The both ends of above-mentioned flexible strand are respectively arranged with the first joint and the second joint, the first joint with after presser feet crank Lever is be hinged, the expansion link of the second joint and driver connects.
Magnet, magnet and are installed with by magnet mounting seat on casing end face on front side of the first above-mentioned joint One joint adhesive connects；
Or：Magnet is installed with by magnet mounting seat on the casing inner wall of the rear lever side of presser feet crank, Magnet is connected with the rear lever adhesive of presser feet crank.
Magnet mounting hole is provided with above-mentioned magnet mounting seat, magnet is installed in magnet by screw and installed In hole, and the end face of magnet is set against the first joint.
Sleeve pipe is set with outside above-mentioned flexible strand, sleeve pipe is installed in casing and is tightly connected with the connecting place of casing.
The axis of the expansion link of above-mentioned driver and the axis of flexible strand are vertically arranged, and the 3rd is provided with the expansion link Joint, lift the one end for handle of buckling and the 3rd joint is hinged, the other end is hinged with the second joint, lift and be hinged on machine in the middle part of handle of buckling On shell wall.
Above-mentioned lift is buckled and is provided with hook on handle, and return spring pin is provided with the enclosure wall that handle side is buckled in lift, multiple One end of position spring is hung on return spring pin, the other end is hung on the hook for lifting handle of buckling, and return spring is used to drive lift to buckle Handle resets.
The axis of the expansion link of above-mentioned driver and the axis collinear of flexible strand, then expansion link directly with the second joint connect Connect；Or the axis of the expansion link of the driver and the diameter parallel of flexible strand, then the 3rd joint, lift pressure are provided with expansion link One end of crank is hinged with the 3rd joint, the other end is hinged with the second joint, is lifted and is hinged in the middle part of handle of buckling on enclosure wall.
Embedded installation position is provided with the trailing flank of above-mentioned casing, driver is arranged in the installation position.
Above-mentioned driver is electromagnet or cylinder.
The present invention compared with prior art protrude the advantages of be：
1st, structure optimization of the present invention, between the first transmission mechanism and the second transmission mechanism using flexible connection, and sleeve pipe with The connecting place of casing is tightly connected, and can efficiently solve the leakage problem of machine oil.
2nd, the present invention can mitigate the kgf needed for lift pressure, the requirement to electromagnet kgf be reduced, so as to reduce electromagnetism The use cost of iron.
3rd, the present invention is optimized by casing structure, built in electromagnet, will improve the aesthetic property of machine shape.
4th, the present invention substitutes back-moving spring using magnet, eliminates the influence of spring resistance, reduces lift pressure, so that With the electromagnet of smaller power cost is reduced to realize.
Brief description of the drawings：
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is the schematic diagram that the magnet of the present invention is arranged in magnet mounting seat；
Fig. 3 is one of schematic diagram that the present invention is arranged on casing；
Fig. 4 is the two of the schematic diagram that the present invention is arranged on casing；
Fig. 5 is the three of the schematic diagram that the present invention is arranged on casing.
Embodiment：
With specific embodiment, the invention will be further described below, referring to Fig. 1-5：
A kind of foot lifting mechanism of sewing machine, include the first transmission mechanism and the second transmission mechanism, described first passes Motivation structure includes presser feet axle 1, and the upper end of presser feet axle 1 is connected with presser feet dog 2, and one end of presser feet dog 2, which is arranged on, to be fixed on In the guide groove 5 of guide block 4 in casing 3, presser feet dog 2 moves up and down along the guide groove 5 on guide block 4.Guide block 4 limits presser feet and rolled First 2 movement locus, ensure to move up and down, limit rotation, so as to ensure presser feet lift pressure accuracy of action.Presser foot lifter lifter plate 6 lower end connects presser feet dog 2, the preceding lever 7 for the presser feet crank 11 that upper end and middle part are hinged on casing 3 connects；Described Second transmission mechanism includes driver, and driver can use electromagnet 8 or cylinder etc., below by taking electromagnet 8 as an example.First Connected between transmission mechanism and the second transmission mechanism by flexible strand 9, flexible strand 9 can be cordage or steel wire rope.It is flexible One end of rope 9 is connected with the rear lever 10 of presser feet crank 11, the expansion link 12 of the other end and electromagnet 8 connects, and expansion link 12 is For the iron core of electromagnet 8.Flexible strand 9 is in tensioning state.
The both ends of above-mentioned flexible strand 9 are respectively arranged with the first joint 13 and the second joint 14, and the first joint is bent with presser feet The rear lever 10 of handle 11 is hinged by nipple pin 15, the second joint 14 is connected with the expansion link 12 of electromagnet 8, to control presser foot lifter The position of lifter plate 6.
The joint 13 of flexible strand 9 and first and the second joint 14 can be made of one formula structure or split-type structural.
Magnet 18 is installed with by magnet mounting seat 17 on the casing end face 16 of the above-mentioned front side of the first joint 13, inhaled Iron-stone 18 is connected with the adhesive of the first joint 13.Magnet 18 can also use following installation：In the rear lever 10 of presser feet crank 11 Magnet 18, the rear lever of magnet 18 and presser feet crank 11 are installed with by magnet mounting seat on the inwall of casing 3 of side 10 adhesives connect, to control the position of presser foot lifter lifter plate 6.
Magnet 18 substitutes the back-moving spring in existing design, eliminates the influence of spring resistance, reduces lift pressure, so as to Using the electromagnet 8 of smaller power cost is reduced to realize.
When machine is normally sewed, gap is left between presser foot lifter lifter plate 6 and presser feet dog 2, when presser feet dog is altered about 2 Be unlikely to encounter presser foot lifter lifter plate 6 when dynamic and produce noise, be generally by torsion spring come spacing presser foot lifter lifter plate 6 come Realize.Magnet 18 is fixed on machine, and in the presence of the suction of magnet 18, the first joint 13 overcomes resistance to be close to magnet 18, so as to ensure that the position of presser foot lifter lifter plate 6 is constant.When electromagnetism Tie Tong 8 is electric, it need to only overcome presser foot lifter lifter plate 6 instantaneous Magnetic force, the middle and later periods of journey is pressed through in lift, the strength of electromagnet 8 is consumed without unnecessary resistance.
Magnet mounting hole is provided with above-mentioned magnet mounting seat 17, magnet 15 is installed in suction iron by screw 19 In stone mounting hole, and the end face of magnet 18 is set against the first joint 13.
Sleeve pipe 20 is set with outside above-mentioned flexible strand 9, sleeve pipe 20 is installed in casing 3 and sealed with the connecting place of casing 3 Connection.
Sleeve pipe 20 is to prevent the machine oil inside casing 3 from largely leaking out to outside casing 3.Concrete principle is：Sleeve pipe 20 through the region of the inside machine oil infiltration of casing 3, and is shut in the junction of chassis hole with anaerobic adhesive, ensures to close with extraneous, Flexible strand 9 avoids the big region of oil mass through sleeve pipe 20, and flexible strand 9 moves back and forth the work for reaching strength transmission inside sleeve pipe 20 With.
The axis and the axis of flexible strand 9 of the expansion link 12 of above-mentioned electromagnet 8 are vertically arranged, that is, vertical installation When, be provided with the 3rd joint 21 on the expansion link 12, lift buckle handle 22 one end and the 3rd joint 21 by connecting pin 23 it is be hinged, The other end is be hinged by the joint 14 of connecting pin 23 and second, and the middle part for lifting handle 22 of buckling is hinged on the wall of casing 3.
Above-mentioned lift buckle handle 22 baseplane on be provided with hook 24, lift buckle the side of handle 22 enclosure wall on set There is a return spring pin 25, one end of return spring 26 is hung on return spring pin 25, the other end is hung on lift and buckled the hook 24 of handle 22 On, return spring 26 is used to drive lift handle 22 of buckling to reset.
The axis of the expansion link 12 of above-mentioned electromagnet 8 and the axis collinear of flexible strand 9, that is, during 8 traverse of electromagnet, Then expansion link 12 is directly connected with the second joint 14；Or the axis and the axis of flexible strand 9 of the expansion link 12 of the electromagnet 8 are put down OK, then be provided with the 3rd joint 21 on expansion link 12, lift buckle handle 22 one end and the 3rd joint 21 be hinged, the other end and second Joint 14 is be hinged, and the middle part for lifting handle 22 of buckling is hinged on the wall of casing 3.
Embedded installation position 27 is provided with the trailing flank of above-mentioned casing 3, electromagnet 8 is arranged on the installation position 27 It is interior, form built-in structure.
During assembling, it is desirable to certain gap is left between presser feet dog 2 and presser foot lifter lifter plate 6.During machine normal operation, The iron core of electromagnet 8 is in extreme higher position under the pulling force effect of return spring 26, and presser feet axle during play, does not drive whole lift about 1 The motion of laminated structure, so as to reduce vibrations and noise.When electromagnet 8 is powered, the iron core of electromagnet 8 moves downward lever 10 after drive Rotate, lever 7 rotates before being driven by flexible strand 9, finally lifts presser foot lifter lifter plate 6 and realizes that presser foot lifter acts.It is main during power-off Lean on the presser feet axle pressure spring of casing 3 to realize to reset, the principal security presser feet dog 2 of return spring 26 and presser foot lifter lifter plate 6 it Between gap.
Above-described embodiment is only one of presently preferred embodiments of the present invention, and the practical range of the present invention is not limited with this, therefore： The equivalence changes that all shapes under this invention, structure, principle are done, all should be covered by within protection scope of the present invention.

Claims (8)

  1. A kind of 1. foot lifting mechanism of sewing machine, it is characterised in that：Include the first transmission mechanism and the second transmission mechanism, it is described The first transmission mechanism include presser feet axle, the upper end of presser feet axle is connected with presser feet dog, and one end of presser feet dog is arranged on solid In the guide groove for the guide block being scheduled in casing, guide block limits the movement locus of presser feet dog, the lower end connection of presser foot lifter lifter plate Presser feet dog, upper end and middle part are hinged on the preceding lever connection of the presser feet crank on casing；The second described transmission mechanism includes There is driver, connected between the first transmission mechanism and the second transmission mechanism by flexible strand, one end and the presser feet crank of flexible strand The connection of rear lever, the expansion link of the other end and driver connects；
    The both ends of described flexible strand are respectively arranged with the first joint and the second joint, the rear lever of the first joint and presser feet crank The expansion link of be hinged, the second joint and driver connects；
    Magnet is installed with by magnet mounting seat on casing end face on front side of the first described joint, magnet connects with first Head adhesive connection；
    Or magnet, magnet are installed with by magnet mounting seat on the casing inner wall of the rear lever side of presser feet crank It is connected with the rear lever adhesive of presser feet crank.
  2. A kind of 2. foot lifting mechanism of sewing machine according to claim 1, it is characterised in that：Described magnet mounting seat On be provided with magnet mounting hole, magnet is installed in magnet mounting hole by screw, and the end face of magnet is opposite First joint is set.
  3. A kind of 3. foot lifting mechanism of sewing machine according to claim 1, it is characterised in that：It is set with outside described flexible strand There is sleeve pipe, sleeve pipe is installed in casing and is tightly connected with the connecting place of casing.
  4. A kind of 4. foot lifting mechanism of sewing machine according to claim 1, it is characterised in that：Described driver stretches The axis of bar and the axis of flexible strand are vertically arranged, and the 3rd joint is provided with the expansion link, lift the one end and the 3rd for handle of buckling Joint is be hinged, the other end is hinged with the second joint, lifts and is hinged in the middle part of handle of buckling on enclosure wall.
  5. A kind of 5. foot lifting mechanism of sewing machine according to claim 4, it is characterised in that：Described lift is buckled and set on handle Hook is equipped with, return spring pin is provided with the enclosure wall that handle side is buckled in lift, one end of return spring is hung on return spring pin, The other end be hung on lift buckle handle hook on, return spring be used for drive lift buckle handle reset.
  6. A kind of 6. foot lifting mechanism of sewing machine according to claim 1, it is characterised in that：Described driver stretches The axis of bar and the axis collinear of flexible strand, then expansion link be directly connected with the second joint；Or the expansion link of the driver The diameter parallel of axis and flexible strand, then be provided with the 3rd joint on expansion link, lift buckle handle one end and the 3rd joint it is be hinged, The other end is hinged with the second joint, is lifted and is hinged in the middle part of handle of buckling on enclosure wall.
  7. A kind of 7. foot lifting mechanism of sewing machine according to claim 1, it is characterised in that：The trailing flank of described casing On be provided with embedded installation position, driver is arranged in the installation position.
  8. A kind of 8. foot lifting mechanism of sewing machine according to claim 1, it is characterised in that：Described driver is electromagnetism Iron or cylinder.
CN201510100538.4A 2015-03-07 2015-03-07 A kind of foot lifting mechanism of sewing machine Active CN104630993B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510100538.4A CN104630993B (en) 2015-03-07 2015-03-07 A kind of foot lifting mechanism of sewing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510100538.4A CN104630993B (en) 2015-03-07 2015-03-07 A kind of foot lifting mechanism of sewing machine

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CN104630993B true CN104630993B (en) 2017-11-10

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018149246A (en) * 2017-03-15 2018-09-27 Juki株式会社 Sewing machine
CN108950895B (en) * 2017-05-19 2023-09-05 浙江中捷缝纫科技有限公司 Quick change mechanism for presser foot of sewing machine and sewing machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201169682Y (en) * 2008-03-18 2008-12-24 魏明藩 Pedals type backstitch control device for needle vehicle
CN201933286U (en) * 2011-01-14 2011-08-17 上海日野工业缝纫机有限公司 Three-in-one thread release mechanism
CN103643407A (en) * 2013-12-25 2014-03-19 新杰克缝纫机股份有限公司 Sewing machine and presser foot transmission device thereof
CN104073984A (en) * 2014-07-16 2014-10-01 新杰克缝纫机股份有限公司 Sewing machine with presser foot lifting mechanism arranged at head of housing
CN204174394U (en) * 2014-10-31 2015-02-25 浙江美机缝纫机有限公司 A kind of automatic needle-foot-lifting mechanism of Sewing machines
CN204982333U (en) * 2015-09-18 2016-01-20 台州市极派工业缝纫机有限公司 Automatic trimming assembly on chain sewing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201169682Y (en) * 2008-03-18 2008-12-24 魏明藩 Pedals type backstitch control device for needle vehicle
CN201933286U (en) * 2011-01-14 2011-08-17 上海日野工业缝纫机有限公司 Three-in-one thread release mechanism
CN103643407A (en) * 2013-12-25 2014-03-19 新杰克缝纫机股份有限公司 Sewing machine and presser foot transmission device thereof
CN104073984A (en) * 2014-07-16 2014-10-01 新杰克缝纫机股份有限公司 Sewing machine with presser foot lifting mechanism arranged at head of housing
CN204174394U (en) * 2014-10-31 2015-02-25 浙江美机缝纫机有限公司 A kind of automatic needle-foot-lifting mechanism of Sewing machines
CN204982333U (en) * 2015-09-18 2016-01-20 台州市极派工业缝纫机有限公司 Automatic trimming assembly on chain sewing machine

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Address after: 318000 no.1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province

Patentee after: Jack Technology Co.,Ltd.

Address before: 318000 No. 15 Airport South Road, Jiaojiang District, Zhejiang, Taizhou

Patentee before: JACK SEWING MACHINE Co.,Ltd.

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Application publication date: 20150520

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Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

Application publication date: 20150520

Assignee: Taizhou Yafeng glasses Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000379

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

Application publication date: 20150520

Assignee: Zhejiang Juzi Plastic Industry Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000378

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

Application publication date: 20150520

Assignee: TAIZHOU FUDA ELECTROMECHANICAL CO.,LTD.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000377

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

Application publication date: 20150520

Assignee: Zhejiang Zhengya Garment Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000376

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

Application publication date: 20150520

Assignee: Taizhou Shengda Packaging and Printing Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000375

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

Application publication date: 20150520

Assignee: Taizhou Fanda Clothing Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000374

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240808

EE01 Entry into force of recordation of patent licensing contract
EE01 Entry into force of recordation of patent licensing contract

Application publication date: 20150520

Assignee: Zhejiang Pritzker Energy Saving Technology Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000454

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826

Application publication date: 20150520

Assignee: Taizhou Wantong Steel Structure Engineering Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000453

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826

Application publication date: 20150520

Assignee: Taizhou Steak Silk Underwear Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000452

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826

Application publication date: 20150520

Assignee: Zhejiang Guoyu Auto Parts Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000451

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826

Application publication date: 20150520

Assignee: Taizhou still Plastic Lighting Co.,Ltd.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000450

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826

Application publication date: 20150520

Assignee: TAIZHOU XINGMING PHARMACEUTICAL CO.,LTD.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000449

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826

Application publication date: 20150520

Assignee: TAIZHOU DADI CONCRETE CO.,LTD.

Assignor: Jack Technology Co.,Ltd.

Contract record no.: X2024330000448

Denomination of invention: A lifting foot mechanism for a sewing machine

Granted publication date: 20171110

License type: Common License

Record date: 20240826