Abstract: A sewing group is associated with a sewing machine and a feed device and comprises a work-holder drivable by two links supported on respective slides which are moved by separate stationary positioning motors which drive the respective slides. The maximum drive forces supplied in the two directions of movement of the feed device are as nearly equal as possible. Links are articulatedly connected with a work-holder for the transmission of exclusively axial forces. At the work-holder is pivoted one end of a guide arm structure whose other end is received for rotary movement in a longitudinal guide. Due to the equivalent load on the two links 13, 26 there result, for the positioning motors, equal drive conditions and equal maximum forces. The feed device is especially suitable for sewing groups with work-holders drivable by step motors.

Abstract: A sewing assembly equipped with a feed mechanism comprises a work holder which is supported by two swing arms hinged to each other, and moved by two stationary positioning motors. Each of the positioning motors is in positive drive connection with a slide carrying one of the swing arms. The swing arm directly carrying the work holder comprises a non-buckling center bar, a cross bar, and two prestressed spring steel strips by which the ends of the cross bar are connected to the end close to the swing axis of the center bar. The two member linkage with the stationary motors and the light-weight and yet non-bending swing arm result in a very low inertia of the feed mechanism.