Abstract: The invention concerns a method and apparatus for forming a double back stitch seam from an upper and lower thread where the upper thread is conducted down by means of a needle through a sewing material and then up again, forming a loop at its underside and the lower thread is conducted through the upper thread loop and anchored on the sewing material by tightening the latter.

Abstract: A thread storage and supply device, particularly for a textile machine, having first storage means for a positive thread supply and a second storage means located ahead of the first storage means for permitting an intermittent thread supply. The second storage means includes an elongated hollow shaft having a stationary storage drum mounted thereon. The first thread storage includes a thread drum disposed adjacent and coaxial with the storage drum and rotatably supported on an extension of the hollow shaft. A winding element is associated with the storage drum for permitting winding of a thread thereon, which winding element is rotatably supported on the hollow shaft and disposed axially between the storage and thread drums. The thread withdrawn from the storage drum passes axially through the hollow shaft and is then wound onto the annular thread storage area of the thread drum.

Abstract: A thread storage and supply device for textile machines comprising a storage drum which is nonrotatably journaled at the free end of an axle, which axle is prevented from rotating by means of a laterally displaced journal pin which extends parallel to the longitudinal direction of the axle and is rotatably positioned in a rotatably journaled disc. The device further comprises a thread supply means which is journaled on the axle, which support means can be set in rotation and which winds the thread upon the storage drum. The rotatably journaled disc is connected, for the purpose of synchronous rotation, to the rotating thread supply means by a connecting pin which is rigidly mounted on the thread supply means and which passes through a radial slot in the rotatably journaled disc. The thread supply means includes a corotational channel for the thread.