Spreader driving device of a sewing machine

Abstract

A spreader driving device is constructed so that the stepping motor (2) driven in synchronism with the elevating motion of a needle bar and the support shaft (3) are provided at a frame mounted to the back side of a presser foot. A lever (4), fitted onto the support shaft, is provided at the rear end with a sector gear (6) and at the fore end with a spreader (5). The sector gear engages with a driving gear (7) driven by an output shaft (8) of the stepping motor, so as to swing the lever (4) and spreader (5) by the drive of stepping motor. Also, the frame is divided into a movable frame having the stepping motor, the support shaft, and the lever mounted thereon, and a fixed frame (17) for mounting the device to the sewing machine. Between the frames is arranged a shifting device (18) for shifting the movable frame a moderate distance parallel to the needle position with respect to the fixed frame, whereby the center of swinging motion of the spreader can be shifted from a point P1 to a point P2.

Dependencies are inferred from the claim text.