Durkopp Adler Aktiengesellschaft

Christian Mollenkamp

Bernd Pofalla

Gerd Papajewski

A cutting device in a sewing machine for creating a slit opening for a buttonhole in a workpiece. First and second tool parts are spaced apart from each other in an open position and can be brought together in a closed position. One tool part has a block and the other tool part has a cutting edge. The block is formed in the shape of a strip, is accepted into a slit located on the sewing machine and is attached there with a clamping device. A slit opening can be created in a workpiece in a block-cutting mode by the cutting edge and the block. The cutting device can also be used for making a slit opening in a workpiece in a slit-cutting mode by removing the block and providing a different cutting edge, which can be performed in a simple manner.

Cutting device for creating a slit opening for a buttonhole

A sewing machine, in particular a buttonhole sewing machine, is equipped with needle-thread-clamping scissors which have a lower half provided with a cutting edge at its tip portion. They further have an upper half pivotal relative to the lower half and having a cutting edge at its tip portion. Further, they have a clamping jaw to be pressed elastically on the tip portion of the upper half for clamping and holding a tail piece of a needle thread. The upper half can be pivoted in such a way that a receiving opening for the needle thread is formed in an opened position of the scissors, whereas, in a closed position, the needle thread is cut and the tail piece of the needle thread is clamped and retained between the upper half and the clamping jaw. The upper half can further take a third position in which the tip portion of the upper half is free from the clamping jaw and the tail piece of the needle thread is released.

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Offenbach, Germany

Christian Mollenkamp