Patent ID: 6394013
Filing Date: 2002-05-28
Classification: B65H,D05B,D05C,D05D

Abstract:
A thread cutter for a sewing machine, the sewing machine comprising a machine chassis, a sewing head, a working surface, and a pressure foot, said thread cutter comprising:a. an adapter plate mounted to said machine chassis distal said sewing head; b. a scissors pivot shaft attached normal to said adapter plate, said scissors pivot shaft positioned on said adapter plate adjacent to said machine pressure foot; c. an elongated lower blade member comprising a cutting extension, a lever extension, and a pivot point located between said cutting extension and said lever extension, said lower blade member pivotally mounted at said pivot point to said scissors pivot shaft; d. said cutting extension comprising a sharpened upper cutting edge and an angled tip, said angled tip urged in mating contact with said machine working surface by biasing means; e. said lever extension comprising a lower blade actuator attachment point; f. an elongated upper blade member comprising a sharpened lower edge, a pivot point, and an upper blade actuator attachment point, g. said upper blade member pivotally attached to said scissors pivot shaft, h. means for biasing said upper blade member away from said lower blade member, i. upper blade member actuator means connected to said upper blade actuator attachment point and attachment means on said adapter plate, said upper blade actuator means urging said upper blade member in sliding shearing contact across said lower blade member to cut said thread; j. means for activating said upper blade member actuator to cut said thread, k. lower blade actuator means connected to said lower blade member actuator attachment point and attachment means on said adapter plate, said lower blade actuator synchronized with said machine pressure foot to urge said lower blade member in conformity with said machine pressure foot vertical displacement.