D&uuml;rkopp Adler Aktiengesellschaft

Durkopp Adler Aktiengesellschaft

Sevki Hosagasi

Horst Seibert

Arthur Picker

Johann Enns

Andree Cramer

Bernd Meyer

In a method of pulling the free end of a needle thread from the top to the bottom of at least one work piece upon a first stitch of a seam that is to be sewn, use is made of a sewing machine with at least one presser which can be placed on, and lifted off, the work piece. The needle thread is held tight while a needle-thread loop is extended by the tip of the hook so that the free end is pulled through the work piece. While the needle thread is held tight, the presser is at least partially relieved. The relief time increases as the thickness of the work piece grows.

Method of pulling the free end of a needle thread from the top to the bottom side of a work piece and sewing machine for putting the method into practice

A microprocessor-assisted sewing machine control equipment is flexibly applicable for controlling the sewing machine driving motor and further electric motors which are controlled independently of or in dependence on the rotary position. To this end, a control system is allocated to each electric motor, comprising an open-loop control unit for rotary-position-independent controlling, a closed-loop control unit for controlling the electric motor in dependence on the rotary position, and a selection unit. The selection unit couples for control either the closed-loop control unit or the open-loop control unit with the electric motor, depending on whether the electric motor is controlled by closed-loop control in dependence on the rotary position or by open-loop control independently of the rotary position.

Microprocessor-assisted sewing machine control equipment

Growing community of inventors

Bielefeld, Germany

Sevki Hosagasi