Thread cutting device for a sewing machine

Details Thread cutting device for a sewing machine Thread cutting device for a sewing machine

2009-01-09

2011-12-06

Izaguirre, Ismael (Department: 3765)

Sewing

Elements

Thread cutting, severing or breaking

Reexamination Certificate

active

08069799

ABSTRACT:
A thread cutting device for a sewing machine with a hook rotatable in a vertical plane includes a drive motor, a fixed knife which has a working-side wall extending towards a thread fetching zone of the sewing machine to terminate at a first cutting edge, and a movable knife which is driven by the drive motor to angularly move between fetching and thread cutting positions in a vertical plane. The movable knife has a lateral edge surface defining a cavity in an intermediate segment thereof to engage lower and upper threads when the movable knife reaches the fetching position. The movable knife has a second cutting edge disposed to press the first cutting edge so as to complete a cutting action.

REFERENCES:
patent: 3605664 (1971-09-01), Hedegaard
patent: 3776161 (1973-12-01), Papajewski et al.
patent: 4098208 (1978-07-01), Hedegaard
patent: 4437423 (1984-03-01), Yamazawa
patent: 6516735 (2003-02-01), Hintzen et al.
patent: WO9209735 (1992-06-01), None

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