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Patent Searching and Data


Title:
SEWING MACHINE
Document Type and Number:
WIPO Patent Application WO/2021/057216
Kind Code:
A1
Abstract:
A sewing machine, comprising a main shaft (10), a feed dog frame (20), a feed dog (30) which is mounted on the feed dog frame (20), a feed mechanism (40) which is connected between the main shaft (10) and one end of the feed dog frame (20), a feed dog lifting mechanism (50) which is connected between the main shaft (10) and the other end of the feed dog frame (20), a presser foot (90), and a presser foot lifting mechanism (60) which is connected to the presser foot (90); the feed mechanism (40) comprises a stitch length seat (41) which is provided with a first fixed oscillating fulcrum (O1), and further comprises a driving source (110), a driving cam (120) which is driven to rotate by the driving source (110), a first transmission clutch mechanism (70), and a second transmission clutch mechanism (80); the first transmission clutch mechanism (70) acts between the driving cam (120) and the stitch length seat (41), and the second transmission clutch mechanism (80) acts between the driving cam (120), one presser foot lifting transmission component in the presser foot lifting mechanism (60), and one feed dog lifting transmission component in the feed dog lifting mechanism (50). By using one driving source, three functions of the sewing machine, i.e., adjusting stitch length, lifting a presser foot and automatically dropping a feed dog (30) during feeding, can each be controlled respectively, and the adjustment of stitch length also achieves forward sewing, backward sewing, and dense sewing by the sewing machine; in addition, costs are greatly reduced and less space is occupied.

Inventors:
GUAN JIANPING (CN)
LIN XIAOXIAO (CN)
XU SHUAI (CN)
CHENG CHUANYANG (CN)
Application Number:
CN2020/103373
Publication Date:
April 01, 2021
Filing Date:
July 22, 2020
Export Citation:
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Assignee:
JACK SEWING MACHINE CO LTD (CN)
International Classes:
D05B27/24; D05B29/02; D05B69/12
Foreign References:
CN105002663A2015-10-28
CN105088547A2015-11-25
CN109989186A2019-07-09
CN103668797A2014-03-26
CN106702602A2017-05-24
JPH0523465A1993-02-02
US4462323A1984-07-31
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (Scitech PlaceNo.22 Jian Guo Men Wai Ave.,Chao Yang District, Beijing 4, CN)
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