Lindauer Dornier Gesellschaft Mbh

Christian Hannes

Werner Birner

Herbert Reinhardt

Peter D Dornier

Herbert Mueller

Alexander Chvorak

For weaving pattern formation of a woven fabric with weft threads (), warp threads () and effect threads (), data sets () are produced according to a method in which data values are derived from weft sequence numbers () and from positions of interlacing points (P) of an effect thread () with the weft threads () in the pattern repeat (). These data sets () are supplemented by further data values () derived from the weaving pattern, in such a manner so that they form a pattern draft () for a weaving pattern with additional weft effects. In a weaving machine with devices for slidingly displacing effect threads () in the weft direction (), the weaving pattern formation is derived from the data sets () of this pattern draft ().

Method and apparatus for weaving pattern formation in woven fabrics with additional weft effects

The leading end of a weft thread exiting from a weft insertion channel in an air jet weaving loom is monitored by a weft stop motion positioned in a weft stretching channel directly downstream, as viewed in the weft motion direction, of an exit of the weft insertion channel. The weft stop motion is either an additional weft stop motion monitor or it is the first weft stop motion device repositioned from a location at the exit of the weft insertion channel to a location in the weft stretching channel. In such a position in the weft stretching channel faults or deformations such as a loop in the leading end section of the weft thread are readily or positively detected for generating a respective loom control signal.

Method and apparatus for monitoring a leading end of a weft thread in a stretching channel in an air jet loom

A supply spool supplies a weft thread through an adjustable actuated thread brake and a thread tension sensor to a weft thread accumulator, from which an accumulated insertion length of the thread is provided to a weft insertion device. The tension sensor provides a measured actual thread tension signal to a control arrangement, which compares the actual tension to a selected rated tension, and, dependent on the deviation therebetween, provides a control signal to an actuator of the thread brake, so that the actual thread tension constantly corresponds to the selected rated tension. Another sensor provides a signal indicating a change from an empty spool to a full spool. Responsive thereto, the control arrangement actuates the thread brake to an adjustable starting brake setting as a coarse adjustment. Then the self-regulating fine adjustment is continued. A constant winding tension and thread accumulation length are achieved in the thread accumulator.

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Wangen, Germany

Christian Hannes