Automatic thread cutting device for sewing machine provided with horizontal loop taker

摘要

Disclosed is an automatic thread cutting device for a sewing machine which is provided with a horizontal loop taker, wherein a thread catching member ( 4 ) is operated in response to a thread cutting instruction to reciprocatingly move with a movable blade ( 5 ) along a predetermined course, the thread catching member ( 4 ) normally catching the upper thread when moving in the return-way of reciprocation to guide the upper thread to a fixed blade ( 14 ) which is provided to cut the upper thread in cooperation with the movable blade ( 5 ), and wherein a thread regulating means is provided to cut the lower thread ( 29 d) together with the upper thread, the thread regulating means being operated to press down the lower thread ( 29 d) to a position where the lower thread ( 29 d) is caught by the thread catching member ( 4 ) in addition to the upper thread when the thread catching member ( 4 ) is moving in the return-way of reciprocation.