High frequency sewing machine

摘要

A high frequency sewing machine for intermittently transferring a work material mounted on a work material mounting plate by means of feed dogs which perform synthetic circular movement in horizontal and vertical directions and which cooperate with a presser foot to effect the continuous bonding of the overlapped portions of a fiber cloth which are continuously bonded together by means of a thermoplastic resin tape held between the overlapped portions of the fiber cloth in the work material to melt under high frequency dielectric heating. High frequency power is applied between a pair of planar electrodes respectively disposed above and below the work material during the time when the transfer by these feed dogs is stopped to effect the melting process. The occurrence of defective products having burn or the like due to heat concentration can be prevented while obtaining assured uniform bonding strength by using the high frequency power. Additionally, the bonding of curvilinear portions and the bonding of stretchable fiber clothes can be sufficiently handled.