THREAD CUTTING DEVICE OF SEWING MACHINE

摘要

PURPOSE: A thread cutting device of a sewing machine is provided to separate the adhered state of a needle thread and a looper thread at an optimum timing during a driving knife is processing. CONSTITUTION: A thread cutting device of a sewing machine comprises the following: a thread tension adjusting unit(33) adhering and separating a needle thread(A) and a looper thread; a driving knife(35) cutting the needle thread and the looper thread by moving forward and backward on the rear side of a needle plate(34); a movable arm(38) including a follower(37); a cam member(40) changing the angle of the movable arm; a first linking unit(42) transferring the angle change of the movable arm to the thread tension adjusting unit; and a second linking unit(43) moving the driving knife by transferring the driving force of a drive unit(41).