Kochs Adler Ag

Durkopp Adler Aktiengesellschaft

Horst Thiele

Gunter Landwehr

Hans Scholl

A rotary looper for a lockstitch sewing machine, which can receive either a coreless thread package or a thread-wound bobbin. An upper bobbin-housing part is provided with two separate thread-tensioning elements and with respective thread-guide slots associated with them. In this way, the thread withdrawn either from a coreless thread package or a looper-thread bobbin passes over an optimally-shaped thread path on its way to the sewing area, and in both cases, a specifically adapted thread-tensioning force is exerted on the thread withdrawn. Preferably, the front part of the thread supply, in the coreless package or bobbin, can be accommodated in front of the movement path of the sewing needle, whereby the bobbin-housing can accommodate an extra-wide thread supply. An upwardly extended shoulder is provided on the lower part of the bobbin housing, so that the axially widened needle thread loop can slide unimpeded over the axially-extended bobbin-housing upper part. Preferably, there is also an oblique guide surface on the rear of the lower bobbin-housing part for further facilitating the passage of the needle thread loop.

Rotary looper for a lockstitch sewing machine

A sewing machine has a sewing head and at least one workpiece holder for receiving the workpiece. The sewing head and the workpiece holder are movable relative to one another in two coordinate directions. In order to be able to adequately secure the workpiece in the workpiece holder, below the latter is provided a supporting plate which supports the latter and which is fixed in one coordinate direction (x-direction) relative to the sewing head, extends at least over the maximum relative movement in said coordinate direction (x-direction) and has a recess extending in the other coordinate direction for the passage of a needle. Between the supporting plate and the workpiece holder is provided a supporting belt, which is fixed relative to the workpiece holder in both coordinate directions.

Sewing machine

In a sewing machine a workpiece feeding device having a lower feeding member intermittently and reversably driven and an upper feeding member in a steady contact with the workpiece and drivingly connected to the lower feeding member by means of connecting elements including one-way coupling means and a device arranged between the latter and the upper feeding member for interrupting or reversing the upper feed motion simultaneously when reversing the lower feeding member; different embodiments are described.

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Bielefeld, Germany

Horst Thiele