US 5,019,116 AGranted

Sewing machine apparatus for the succesive production of a number of stitch groups in a workpiece

AssigneeDurkoppwerke GmbH

InventorGerhard Riss

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Abstract

In the sewing unit for the successive production of a number of stitch groups in a workpiece, a carriage supported slidably in two opposite directions on a frame and bearing a stitch group sewing machine. The sewing unit is periodically driven by a drive unit back and forth. A clamping device, slidably supported on the frame, is periodically coupled to the carriage by a clutch unit. The stitch group sewing operation takes place during the synchronous motion of the stitch group sewing machine and the clamping device. When the sewing operation is completed and the carriage is at rest, a pushing device attached to the frame pushes the clamping device, once it has been uncoupled from the carriage, in the opposite direction to its previously executed motion, back into its initial position.

Claims10

Dependent claims

A sewing unit for the successive production of a number of stitch groups in a workpiece, said sewing unit comprising;

a frame;
a carriage supported on said frame;
said carriage being intermittently displaceable in two opposite directions along said frame;
a stitch group sewing machine with sewing tools carried on said carriage, said sewing machine being equipped with a liftable material presser;
a clamping device located in the zone of action of said sewing tools for the temporary holding of the workpiece clamped in it;
a feed device provided with a mark for the aligned receiving and subsequent placing of the workpiece that is subsequently to be sewn;
a removal device for the removal of the finally sewn workpiece from the clamping device;
an electropneumatic control having a drive unit for periodically driving the stitch group sewing machine in one of two opposite directions by means of a transmission, so that said clamping device slidably supported on said frame is periodically engaged by said carriage via a clutch unit;
and
a pushing device for pushing said clamping device in the direction opposite to its previously executed movement into its initial position after the completion of the stitch group sewing operation.

7 more elements

Dependencies are inferred from the claim text.