Patent ID: 6817306
Filing Date: 2004-11-16
Classification: D05B,D05D

Abstract:
In a thread cutting device for sewing machine including a thread cutting device that immediately after a sewing operation is completed, cuts a looper thread by pulling it into a setting position located at a side orthogonal to a sewing direction with respect to a needle location of a throat plate, the improvement comprising having a nip means for temporally nipping and holding a cut end of said looper thread cut by said thread cutting device in the vicinity of said setting position, and a blade fixed to said throat plate in such a state that a cutting edge of said blade is faced to said needle location, said blade capable of cutting, under sliding contact, a portion of said looper thread that is hung over between said nip means and a fabric with the feed of fabric immediately after a sewing operation is started in such a state that said cut end is nipped and held by said nip means, and thread cutting device further comprising a cut looper thread disposal means having:a thread suction device that sucks and holds part of a looper thread cut by said blade at a predetermined position before and after cutting; and a thread pick and pull device that picks said part of said looper thread and pulls it into the vicinity of a suction port of said thread suction device.