Feed direction and stitch length cam for zigzag sewing machine

摘要

In a domestic sewing machine a feed dog (35) is adjustable for providing optionally selected stitch length and feeding direction and is adapted to be lowered to a position in which the feeding is inhibited. A control (15) is rotatably connected to a cam disk (16) adapted to adjust the feed dog to a selected position. The cam disk has positions corresponding to lowering of the feed dog as well as reversing the feeding direction, and a zone for controlling the stitch length. The control also has a conical portion (30) which in response to an axial movement of the control is adapted to provide a temporary reversal of the feeding direction.