Sewing – Elements – Thread cutting – severing or breaking
Patent
1989-10-23
1991-07-02
Schroeder, Werner H.
Sewing
Elements
Thread cutting, severing or breaking
112289, 112291, 112292, D05B 6500
Patent
active
050277316
ABSTRACT:
A thread cutting knife device in a sewing machine having a bed has a lower shaft rotatably supported at the bed and a throat plate mounted thereon. A hook is attached to the lower shaft and extends beyond a throat plate. A thread cutting knife and a loop spreading plate are adapted to cross between the hook and the throat plate to cut a needle thread looping portion at a cloth side and a bobbin thread. The knife and the plate are respectively rotatably supported by the lower shaft. The knife has a blade at an upper edge of the tip end thereof. The loop spreading plate has a thread dividing portion extending into the needle thread looping portion at the cloth side and a thread looping portion at the side of the needle. A thread drawing portion is formed at one edge of a base of the dividing portion for holding the needle thread looping portion at the cloth side and the bobbin thread. A blade positioned at the side of the throat plate and is opposed to and crosses the blade of the thread cutting knife.
REFERENCES:
patent: 3512491 (1970-05-01), Heimann et al.
patent: 3728978 (1973-04-01), Honda et al.
patent: 3921554 (1975-11-01), Uozaki et al.
patent: 4437423 (1984-03-01), Yamazawa
Koguchi Yoshimi
Sato Shuichi
Jay Theodore
Lewis Paul C.
Schroeder Werner H.
SSMC Inc.
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