Sewing machine

Details Sewing machine Sewing machine

2007-03-06

2010-11-30

Izaguirre, Ismael (Department: 3765)

Sewing

Elements

Driving mechanisms

C112S302000, C112S254000, C242S14700M

Reexamination Certificate

active

07841283

ABSTRACT:
In the disclosed sewing machine, when a needle threading switch is operated when sewing operation is stopped, a needle bar drive mechanism is activated, a needle threading hook is moved forward to a threading position, and a thread take-up is lowered by predetermined distance by driving a sewing machine motor in reverse rotation after threading a hook portion with a needle thread. Thus, a thread engaging portion of a check spring absorbs loss of required thread amount at the thread take-up and moves from a spring force operable position to a spring force inoperable position. Thus, the needle threading hook retracts to a loop cancel position and the needle thread reliably threads the sewing needle with secure engagement with the needle threading hook when a needle thread end is pulled off from a first thread retaining portion since needle thread is stabilized by absence of needle thread tension.

REFERENCES:
patent: 2518703 (1950-08-01), Marsac
patent: 4736698 (1988-04-01), Inagaki
patent: 4934291 (1990-06-01), Yamamoto
patent: 5003900 (1991-04-01), Ogawa
patent: 5020462 (1991-06-01), Sato et al.
patent: 6941881 (2005-09-01), Noguchi et al.
patent: 7082886 (2006-08-01), Noguchi et al.
patent: 2007/0044698 (2007-03-01), Fujihara
patent: 2007/0193484 (2007-08-01), Rodrigues
patent: A 2004-222916 (2004-08-01), None

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