Thread cutting mechanism for sewing machines

Details Thread cutting mechanism for sewing machines Thread cutting mechanism for sewing machines

D - Textiles, Paper

05

B

112/52

D05B 65/06 (2006.01) D05B 65/00 (2006.01) D05B 73/12 (2006.01)

Patent

CA 1142035

ABSTRACT A knife arrangement for cutting devices on sewing machines, has a fixed knife, and a movable knife arranged upon a driven holder. The movable knife is pivotally mounted in the holder by means of an arm which is angled from the blade at a distance from the cutting edge, the movable knife being lightly pivoted towards the fixed knife by means of a spring. Thus the contact pressure between the knives is normally relatively low and wear is correspondingly reduced. When a thread or stitch to be cut is placed between the knives, the reaction force from the cutting action causes the movable knife to pivot towards the fixed knife. Thus increased contact pressure between the knives arises only during actual cutting.

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