Lindauer Dornier Gesellschaft Mbh

Dornier-Ltf Gmbh

Lindauer Dornier Gmbh

Manuel Renz

Wilhelm Herrlein

Dieter Mayer

Hubert Becher

Michael Lehmann

Horst Hellmuth

Pipetting robot for laboratory use

A thread brake arrangement for use in a textile processing machine includes two brake elements with the thread running there between. An actuator, preferably a piezoelectric actuator, variably actuates one of the brake elements relative to the other to exert an adjustable braking force onto the thread. The thread exerts a reaction force in the thread running direction onto the brake elements. At least one of the brake elements is movably supported to be movable along the thread running direction, and is mechanically coupled to a force transducer that measures the reaction force, which is proportional or equal to the thread tension force. A regulating arrangement receives the measured force signal, and controls the actuator to adjust the adjustable brake element, so as to vary the applied braking force and thus regulate the arising thread tension responsive to and dependent on the measured reaction force.

Thread tension regulation in a thread brake device and method in a textile processing machine

In a gripper weaving loom which weaves several different types of weft threads into a fabric, it is desirable to keep weft material waste to a minimum. For this purpose a weft thread () already inserted into the loom shed is simultaneously held by a weft presenting clamp () and by a holding clamp (). As soon as the weft is held by both clamps the weft is cut by a cutter () effective between the two clamps to form a trailing weft end (B) of the already inserted weft and a leading weft end (A) of a weft yet to be inserted. The holding clamp () keeps holding the trailing end (B) until beat-up of the weft by the reed () is completed. For this purpose, the holding clamp () moves with the reed () into the beat-up position. When beat-up is completed the holding clamp () releases the trailing weft end (B) and returns into a weft receiving position (B). The weft presenting clamp () still holds the leading end (A). The holding clamp () is arranged to move with the reed, while the cutter () is stationary between the two clamps.

Method and apparatus for reducing weft waste in a gripper weaving loom

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Lindau, Germany

Manuel Renz