TWI410545B - - Google Patents

Abstract

This invention is an auxiliary module of hem. The module comprises: a main base whose one side has a rail, the top at one end of rail has a mouthpiece and an air-hose joint; moreover, the bottom of the main base connects to a pneumatic cylinder. The module also comprises: a foolproof control mechanism which joins up with the main base at the center section with a main body having a moveable block. The module also comprises a sliding board which fits the rail of the main base; furthermore, the bottom of the sliding board connects to cylinder rods of the pneumatic cylinder at the main base respectively, while connecting to the main base via a rod body with an elastic piece. The sliding board is formed by combining a fixture board which has an elastic component and a moveable board along an axle. There is a lodge point at the bottom of the moveable board. Also, there is a slot to allow the lodge point at the bottom of the moveable board to travel along a location corresponding to the fixture board. Therefore, when the moveable board is pushed, the lodge point will also synchronously push against the moveable block of the foolproof control mechanism, which causes the moveable block to unhook with a protruding hook. As a result, the reversed motion caused by the unhooked sliding board notifies a sewing machine operator to complete the sewing action.