Feed dog device for a sewing machine

摘要

A feed dog device for a sewing machine includes a feed dog mount mounted under a needle plate and having a feed dog mounted thereon to permit the feed dog to extend through slots in the needle plate. The feed dog mount is coupled with a lever through a force transmitting unit to couple an increased torque generated by a pivotal movement of the lever to the feed dog mount so as to enable a weight end of the lever to drive the feed dog mount to move reciprocatingly in a transverse direction perpendicular to a normal feeding direction of a fabric. The lever is actuated by a cam follower with a torque generated as a result of transmission through a rotary cam member which is rotated with an output shaft of the drive member. Since the feed dog can be reciprocatingly moved in the transverse direction, the sewing machine can perform a variety of sewing operations.