Transmission and balancing mechanism for the workpiece supporting arm of a stitching machine

摘要

For controlling the movement of the rotating shuttle and the feed plate and the positioning of the workpiece supporting arm of a stitching machine, a transmission and balancing mechanism comprised of an arm body unit which has one end pivoted to the machine body of a stitching machine and an opposite end coupled with a stitching last and attached with a front cap for supporting a stitching workpiece, a transmission unit fastened inside the arm body unit to alternatively rotate a rotating shuttle back and forth through a belt transmission, an oscillating unit fastened in the arm body unit to alternatively rotate a feed plate holder back and forth permitting a feed plate to be constantly aligned with the needle bar, and a balancing unit which comprises a counter weight coupled to a cam shaft to balance the movement of the arm body unit.