Durkoppwerke Gmbh

Ernst V Osten-Sacken

Karl Nicolay

A workpiece is held down against a support surface by a holddown foot. Then a feed foot is brought into engagement with this workpiece with its displacement speed decreasing continuously and uniformly until the feed foot comes to a stop against the workpiece, pressing it against the support surface. Thereafter the holddown foot is raised away from the workpiece and the feed foot slides the workpiece a predetermined distance along the surface toward the sewing station. The holddown foot then is brought into engagement with the workpiece on the surface, again with its speed decreasing uniformly and continuously until it comes to a stop on the workpiece. The feedfoot is lifted away from the workpiece and brought back into a position to advance it again. Each of these feet is carried on a rod pivoted of a ternary link guided on a frame and having its remaining pivot connected via a rigid lever also pivoted on the frame and oscillated back and forth by an eccentric arrangement operated by the drive shaft of the sewing machine.

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Brackwede, Germany

Ernst V Osten-Sacken