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AssigneeLindauer Dornier Gesellschaft mbH
InventorsAdnan Wahhoud, Ewald Zimmermann, Herbert Mueller, Peter Czura, Dieter Teufel
Estimating the term…
The starting time of a weft thread insertion in a jet loom is automatically adapted to a change in the speed of the main loom drive shaft, in order to assure that the leading end of the weft thread always arrives at the same time at a weft stop motion device at an exit end of a weft insertion channel through the loom shed. For this purpose, the starting time of the weft insertion is advanced when the loom drive shaft rpm is increased and delayed when the rpm is decreased. The advance or delay has reference to a weaving cycle that begins with the opening of a shed and ends when the shed is fully closed. The flight time .DELTA.t.sub.F of a weft thread through the shed is constant. The adaptation is performed in response to measuring the rotational drive shaft angle .alpha..sub.AR at which a weft thread arrives at the weft stop motion device and determining the starting time in such a way that the weft arrival time (t.sub.2, t.sub.4, t.sub.6) always takes place at substantially the same rotational drive shaft angle .alpha..sub.AR.
A method for determining a starting time of the insertion of a weft thread into a loom shed of a jet weaving loom depending on a change in an rpm of a main drive shaft in said jet weaving loom and within a weaving process beginning with a shed opening and ending with a shed closing, said method comprising the following steps:
An apparatus for controlling the starting time of the insertion of a weft thread into a loom shed, said apparatus comprising an rpm sensor (5) for sensing the speed of a main loom drive shaft to provide a speed first signal, a weft stop motion sensor (4) for providing a second signal signifying an exit of a weft thread from said loom shed, a microprocessor (1) having an input connected to receive said first and second signals for generating timing control signals in response to said first and second signals, and at least one output for providing said timing control signals, and weft insertion elements having control inputs connected to said at least one microprocessor output for controlling the starting time of said weft insertion elements.
Dependencies are inferred from the claim text.