Overlock sewing machine
AssigneePegasus Sewing Machine Mfg. Co., Ltd.
InventorHin Fai Choi
Life of this patent
Estimating the term…
Abstract
A two-needle overlock sewing machine comprises a throat plate and a middle tongue. The throat plate has an opening needle hole and an outer tongue. The middle tongue is disposed parallel to the outer tongue, a thread chain is formed so as to envelop both tongues. The presser foot is disposed so as to press the cloth to the throat plate by a spring. A push-up lever lifts up the presser foot by handling. The push-up lever and the middle tongue are coupled together by a transmission mechanism. By raising the presser foot by manipulation of the push-up lever at the finish of sewing operation, the middle tongue draws back simultaneously and retreats from the needle hole. As a result, the manipulation for drawing back the middle tongue during the process of thread chain handling is not needed, and the operation is simplified.
Claims4
A two-needle overlock sewing machine comprising a throat plate including an opening needle hole, and an outer tongue projecting in the cloth feed direction to form one side of the needle hole, a thread chain holder for cutting off and holding a thread chain, said thread chain holder being disposed before the throat plate, a presser foot disposed above the throat plate, spring means for pressing the presser foot to the throat plate, a push-up lever for lifting up the presser foot from the throat plate against the action of the spring means, and a middle tongue disposed in the throat plate so as to be movable back and forth in the cloth feed direction, said middle tongue being projected into the needle hole in forward motion, and being retreated from the needle hole in backward motion, wherein:
- the middle tongue is coupled with the push-up lever through a transmission mechanism, and when the presser foot is raised by manipulating the push-up lever, the middle tongue is drawn back to retreat from the needle hole.
Dependencies are inferred from the claim text.