Title:
BOBBIN COVER CASE ALLOWING HIGH-SPEED BACK-STITCHING
Document Type and Number:
WIPO Patent Application WO/2013/115465
Kind Code:
A1
Abstract:
The present invention relates to a bobbin cover case allowing high-speed back-stitching. A bobbin cover case according to the present invention comprises a bobbin cover, a guidance apparatus for bobbin thread, a bobbin guide, and a thread guidance plate. The guidance apparatus for bobbin thread comprises: a pressure control plate for maintaining a constant tension in the bobbin thread; a spring for supplying and maintaining tension in the pressure control plate; and a spring cover for fixing the spring in place, and the guidance apparatus for bobbin thread can additionally comprise a thread guide for guiding the bobbin thread into the eye of the needle on the needle plate. The bobbin cover case is produced so as to easily accommodate a bow-shaped bobbin which allows dramatically increased length of bobbin thread, is simplified to reduce the frequent task of replacing the bobbin thread to 3-5 times a day by dramatically increasing the length of the of the bobbin thread, and the bobbin cover case can be used in existing sewing machines without changing the structure or shape thereof. The bobbin cover case according to the present invention can be repeatedly produced from a mold, and thus productivity is high, product thereby is lightweight, and allows finishing process to be precise and clean. Additionally, the bobbin cover case according to the present invention allows significantly increasing the rotational speed up to 5000 rpm due to the lightweight of the product and precision production thereof, and thus allows marked improvement in the quality of backstitches and productivity over the conventional bobbin cover case.
Inventors:
JEONG JONG CHEOL (KR)
Application Number:
PCT/KR2012/009298
Publication Date:
August 08, 2013
Filing Date:
November 07, 2012
Export Citation:
Assignee:
SINJINSTEEL CO LTD (KR)
International Classes:
D05B57/26
Foreign References:
| US3596619A | 1971-08-03 | |||
| JP2009022360A | 2009-02-05 | |||
| KR200386005Y1 | 2005-06-07 | |||
| KR200219042Y1 | 2001-04-02 |
Attorney, Agent or Firm:
LEE, Jae Chil (KR)
이재칠 (KR)
이재칠 (KR)
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Claims: