Looper for a double backstitch sewing machine, has a projection at the looper closure to hold the lower thread in position after cutting, for correct stitching on resumption of sewing

摘要

The looper for a double backstitch sewing machine has a closure (38) with a projection (46), which extends in the movement path (66) of the lower thread (42) when drawn out, while the thread withdrawal blade (55) is in the rest position (58). After thread cutting, the lower thread passes from the outlet opening (48) and around the projection to the thread clamp (61).