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Title:
UNDER-THREAD SUPPLY DEVICE FOR SEWING MACHINE
Document Type and Number:
WIPO Patent Application WO/2014/077440
Kind Code:
A1
Abstract:
The present invention relates to an under-thread supply device for a sewing machine, and more particularly, to an enhanced under-thread supply device for a sewing machine, in which the device of the present invention and a unit for mounting said device are just partially changed so as to increase the winding amount of the under-thread of conventional sewing machines in order to achieve improved efficiency of sewing and efficiently reduce the puckering of a work piece without causing changes in the basic structure of conventional sewing machines. The under-thread supply device (A) for a sewing machine according to the present invention, comprises, as shown in the attached Fig. 1: a hook unit (1) having a body hook (200) arranged rotatably therein so as to extract an under-thread (11), pass the under-thread (11) directly through the upper thread ring (12') and interconnect the under-thread (11) and the upper thread (12) so as to thereby stitch (stitch) the work piece; and an under-thread unit (2) which has a U-bobbin (400) arranged therein, and which is inserted and connected to an under-thread accommodation unit (207) of the body hook (200), wherein the U-bobbin (400) with a roll of under-thread (11') is accommodated in a U-bobbin case (500) so as to supply the under-thread (11) for stitching (stitching) the work piece. The hook unit (1) comprises: a driving unit (100) for receiving power from a power transmission shaft (not shown) of conventional sewing machines and rotating a rotary shaft (130) by driving a gear using the received power so as to rotate a power ring (150) coupled to the rotary shaft (130) through a link (140); the body hook (200) which rotates by the rotating power transmitted from the power ring (150) of the driving unit (100), and which accommodates the under-thread unit (2) therein and interconnects the under-thread (11) and the upper thread (12) directly through the upper thread ring (12'); and a coupling member (300) for coupling the driving unit (100) and the body hook (200). Further, the under-thread unit (2) comprises: the U-bobbin (400) having the roll of under-thread (11') therein, wherein the U-bobbin (400) is arranged in the U-bobbin case (500); and the U-bobbin case (500) for accommodating therein the U-bobbin (400) having the roll of under-thread (11') therein, and the U-bobbin case (500) is inserted and connected to the under-thread accommodation unit (207) of the body hook (200). According to the present invention, provided is a new concept enhanced under-thread supply device for a sewing machine, in which the device of the present invention and a unit for mounting said device are just partially changed to increase the winding amount of the under-thread of conventional sewing machines so as to achieve improved efficiency of sewing and efficiently reduce puckering of a work piece without causing changes in the basic structure of conventional sewing machines.

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Inventors:
SIM YOUNG GUN (KR)
Application Number:
PCT/KR2012/009813
Publication Date:
May 22, 2014
Filing Date:
November 20, 2012
Export Citation:
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Assignee:
SINJINSTEEL CO LTD (KR)
International Classes:
D05B59/00; D05B57/14; D05B57/26
Domestic Patent References:
WO2006004243A12006-01-12
Foreign References:
KR101032967B12011-05-09
KR100740523B12007-07-11
KR20060083278A2006-07-20
JPH06292780A1994-10-21
Other References:
See also references of EP 2921584A4
None
Attorney, Agent or Firm:
LEE, Jae Chil (KR)
이재칠 (KR)
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