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AssigneeLindauer Dornier Gesellschaft mbH
InventorsWerner Birner, Herbert Reinhardt, Christian Hannes, Alexander Chvorak, Peter D. Dornier
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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.
A weft stop motion monitor for weaving looms, said monitor comprising a ring-shaped housing for surrounding a weft motion path, at least two radiation generators arranged in said housing, at least two radiation sensors arranged in said housing, said at least two radiation sensors and said at least two radiation generators forming two pairs, each pair including a generator and a sensor positioned diagonally opposite each other so that a weft thread passing through said monitor is observed from at least two different sides.
A method for detecting a deformation in a leading end section of a weft thread exiting from a weft insertion channel in an air jet weaving loom including at least one waft atop motion device, said method comprising the following steps:
An apparatus for detecting a deformation in a leading end section of a waft thread exiting from a weft insertion channel in an air jet weaving loom, said apparatus comprising a weft stretching channel positioned downstream of said weft insertion channel, said weft stretching channel including a weft entrance area, a jet nozzle positioned for seizing said leading end section of said weft thread and driving said weft thread into said weft entrance area and through said weft stretching channel, at least two weft stop motion devices positioned for monitoring said leading end section of said waft thread, wherein one weft stop motion device (3A) of said at least two weft stop motion devices is positioned in an entrance area of said weft stretching channel for monitoring the presence or absence of said leading end section of said weft thread in said weft entrance area of said weft stretching channel, and wherein the other weft stop motion device (4) of said at least two weft stop motion devices is positioned at an exit of said weft stretching channel.
An air jet weaving loom comprising a weft insertion channel, a weft stretching channel positioned for cooperation with said weft insertion channel, a weft stop motion device (10) positioned in said weft stretching channel, a further weft stop motion device (4) at an exit of said waft stretching channel, and wherein said weft stop motion device (10) is adjustable in its position relative to said further weft stop motion device (4).
Dependencies are inferred from the claim text.