Patent ID: 6101961
Filing Date: 2000-08-15
Classification: D05B

Abstract:
A thread feeding apparatus for a sewing machine which feeds a thread to a stitch forming device for stitch forming on a cloth, said thread feeding apparatus comprising:an upstream gripper for gripping the thread fed from a thread spool, said upstream gripper comprising a pair of grip plates biased together by a compression spring, said upstream gripper being closed by said stitch forming device at a time of forming the stitch and opened at a time of feeding of the cloth;a downstream gripper for gripping the thread introduced from said upstream gripper and comprising a pair of grip plates biased together by a compression spring, said downstream gripper being open at the time of forming the stitch to allow the thread to be pulled by said stitch forming device and being closed at the time of feeding of the cloth; anda reciprocator synchronously driven with said stitch forming device to shift the thread from a thread path extending between said open upstream gripper and said closed downstream gripper at the time of feeding of the cloth to provide a thread quantity necessary for one stitch and to release the thread at the time of forming the stitch;said reciprocator being disposed between a pair of thread guides arranged between said upstream gripper and said downstream gripper and spaced in direction of feed of the thread.