Abstract: A driving apparatus for retaining frame of object-to-be-sewed in automatic sewing machine with driving shaft for causing the retaining frame on an object-to-be-sewed to move in the X-axis direction or the Y-axis direction relative to the position of a sewing needle to perform an optional sewing operation. A pulse generator for moving the retaining frame is provided for generating a given number of pulses, between given rotation angles of the driving shaft, in a synchronous relationship with the rotation of the operational shaft, so that the retaining frame of the object-to-be-sewed is moved in an automatic synchronous relationship with respect to the movement of the sewing needle.

Abstract: For an automatic stitching apparatus of a type comprising at least one sewing machine having a stitching needle operable to perform a stitching operation to form an embroidery pattern on a fabric supported on an embroidery frame, a frame positioning device includes a holder for holding the frame in position relative to the stitching needle, X-axis and Y-axis drive mechanisms each including pulse responsive stepping motors mechanically connected to each other to provide an X-axis or Y-axis output drive necessary to move the frame in a predetermined direction to a given coordinate position, and first and second linkage mechanisms for transmitting the X-axis and Y-axis drives, respectively, to the frame holder. The stepping motor for each drive mechanism is connected in such a manner that the associated rotors are angularly offset from each other with respect to the axis of rotation of the rotors.