Cutter drive mechanism for sewing machine

摘要

In a cutter drive mechanism (70) for sewing machine, the rotational movement of an upper shaft of the sewing machine is transferred to the upward and downward movement by way of a motion transfer mechanism (71) which is operated in an interlocking manner with the rotational movement and a fabric edge is cut by an upper cutter (72) which is operated corresponding to the upward and downward movement and a lower cutter (73) which is cooperatively operated with the upper cutter. Here, the upper cutter (72) is slidably guided by a cutter drive portion (74) which is pivotally mounted on a frame. The motion transfer mechanism (71) is connected to the upper cutter (72) by way of a clutch (75). The clutch (75) transfers power to the upper cutter (72) at the time of performing the cutters of the cutter drive portion (74) and pivotally moves the cutter drive portion to a shunting position and interrupts the transmission of power to the upper cutter (72) at the time of not performing the cutters.