D - Textiles – Paper – 05 – B
Patent
D - Textiles, Paper
05
B
D05B 53/00 (2006.01) D05B 45/00 (2006.01) D05B 47/04 (2006.01) D05B 49/02 (2006.01)
Patent
CA 2221933
A thread feeding apparatus for a sewing machine is disclosed which has a simplified mechanism to secure accurate manufacturing and improved durability to correspond to high speed sewing. The thread feeding apparatus for the sewing machine comprises upstream grippers for respectively gripping an upper looper thread and a lower looper thread, closed by a stitch forming device at a time of a stitch forming and opened at a time of a cloth feeding, downstream grippers for gripping the respective threads introduced from the respective upstream grippers, opened at a time of a stitch forming so that the respective threads are pulled by the stitch forming device and closed at a time of a cloth feeding, and reciprocators which are respectively driven in a synchronous manner with a left needle, a right needle, an upper looper and a lower looper, at a time of a cloth feeding, shift the respective threads of a thread path expanding between the respective opened grippers and the respective closed downstream grippers as a thread quantity necessary for a stitch of the stitch forming device and at a time of a stitch forming, release the respective threads.
G. Ronald Bell & Associates
Suzuki Manufacturing Ltd.
LandOfFree
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