Patent ID: 7597058

Claim:
An apparatus for adjusting a timing of a needle and a looptaker of a sewing machine provided at a zigzag sewing machine having an upper shaft for driving a needle bar holding a needle, a lower shaft for driving a looptaker, a machine frame for rotatably supporting the upper shaft and the lower shaft, a timing belt for connecting and synchronizing the upper shaft and the lower shaft, the apparatus for adjusting the timing of the needle and the looptaker of the sewing machine comprising; a cam member including a first cam surface and a second cam surface and rotated by a driving force; a first arm member and a second arm member each rotatably supported by the machine frame; and a first pulley and a second pulley mounted to the first arm member and the second arm member respectively and always contacting the timing belt, the first pulley following the first cam surface and the second pulley following the second cam surface.