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US 2003/0192614 A1Published application
Method and apparatus for the weft insertion in a jet weaving machine
AssigneeSultex AG
InventorKlaus Berktold
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AssigneeSultex AG
InventorKlaus Berktold
Estimating the term…
A method for the weft insertion in a jet weaving machine is proposed, in which in each work cycle a weft thread (S1) of predeterminable length which is to be inserted is drawn off from a winding drum (3) of a thread supply apparatus (2), the weft thread (S1) is inserted into an open shed (17) by means of a main nozzle (11) which is fed with a transport medium, is bound in into the cloth (G) through the change of shed, and is severed at the cloth edge which is near the main nozzle (11). In each work cycle the drawing off of the weft thread (S1) to be inserted is interrupted at least once in such a manner that at first a first predeterminable thread length is released for the drawing off from the winding drum (3) and then at least one further predeterminable thread length is also released for the drawing off from the winding drum (3).
Method for the weft insertion in a jet weaving machine, in which in each work cycle a weft thread (S1) of predeterminable length which is to be inserted is drawn off from a winding drum (3) of a thread supply apparatus (2), the weft thread (S1) is inserted into an open shed (17) by means of a main nozzle (11) which is fed with a transport medium, is bound into the cloth (G) through the change of shed, and is severed at the cloth edge which is near the main nozzle (11), characterized in that in each work cycle the drawing off of the weft thread (S1) to be inserted is interrupted at least once in such a manner that at first a first predeterminable thread length is released for the drawing off from the winding drum (3) and then at least one further predeterminable thread length is also released for the drawing off from the winding drum (3).
Method in accordance with any one of the preceding claims, in which for the at least partial detensioning of the inserted weft thread (S1) one of the thread lengths is released after the insertion of the weft thread (S1) is completed and before the weft thread is bound in into the cloth (G) through the change of shed.
Method in accordance with any one of the preceding claims, in which the part of the weft thread (S1) to be inserted which is located between the main nozzle (11) and the cloth edge is at least partly detensioned or relaxed after the change of shed and prior to the severing through the release of at least one of the thread lengths.
Method in accordance with any one of the preceding claims, in which one of the thread lengths is released after the severing of the inserted weft thread (S1) and prior to the beginning of the insertion of the following weft thread in order to transport the start of the weft thread from the main nozzle (11) to the beginning of the insertion passage (18).
Method in accordance with any one of the preceding claims, with the first thread length for the weft thread to be inserted being limited by a first thread stopper (41) and the further thread length being limited by a second thread stopper (42) in that after the drawing off of the first thread length the first thread stopper (41) is brought into active connection with the winding drum (3), so that a further drawing off is prevented, and for the further thread length the active connection between the first thread stopper (41) and the winding drum (3) is released, so that the further thread length is drawn off from the winding drum (3) until a further drawing off is prevented through the active connection between the second thread stopper (42) and the winding drum (3).
Apparatus for the weft insertion in a jet weaving machine, comprising a thread supply apparatus (2) having a winding drum (3) from which, in each work cycle, a weft thread (S1) of predeterminable length to be inserted can be drawn off, a main nozzle (11) for the insertion of the weft thread into an open shed (17), with it being possible for said main nozzle (11) to be fed with a transport medium, and a severing device (16) for severing the weft thread at the cloth edge which is near the main nozzle (11), characterized in that means are provided in order to interrupt the drawing off of the weft thread (S1) to be inserted at least once in each work cycle in such a manner that at first a first predeterminable thread length is released for the drawing off from the winding drum (3) and then at least one further predeterminable thread length is also released for drawing off from the winding drum (3).
Apparatus in accordance with claim 9, with the means comprising a first and a second thread stopper (41, 42, 43, 44) for cooperating with the winding drum (3) and a control unit (20), with the control unit (20) bringing the first thread stopper (41) into active connection with the winding drum (3) after the drawing off of the first thread length so that a further drawing off is prevented, and the active connection between the first thread stopper (41) and the winding drum (3) being released for the supplying of the further thread length, so that the further thread length is drawn off from the winding drum (3) until the active connection between the second thread stopper (42) and the winding drum (3) prevents a further drawing off.
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
Drum-type weft feeding devices: with yarn retaining devices, e.g. stopping pins
Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms: handling the…
With yarn retaining devices, e.g. stopping pins: construction or control of the yarn retaining devices
Woven fabrics
Term end not estimated
The invention relates to a method and to an apparatus for the weft insertion in a jet weaving machine in accordance with the preamble of the independent claim of the respective category.
In jet weaving machines the weft insertion takes place by means of a transport medium which inserts the respective weft thread through the open shed. In air jet weaving machines this transport medium is air.
For the weft insertion a definite and predeterminable thread length, which is naturally dependent on the weaving width, is in each case drawn off from the stationary winding drum of a thread supply apparatus and is supplied to a main nozzle. The main nozzle is fed with compressed air and accelerates the weft thread into the open shed. In particular in the case of air jet weaving machines running at high rotational speeds the main nozzle is typically arranged stationary with respect to the sley, so that the main nozzle carries out the oscillatory movement synchronously with the sley. It is also known, in particular in the case of large weaving widths, to provide a pre-nozzle which is fed with air between the thread supply apparatus and the main nozzle in order to increase the acceleration path for the weft thread. A plurality of auxiliary or relay nozzles, which are likewise fed with compressed air, are usually provided along the weft insertion path. After a successful weft insertion the front end of the weft thread is e.g. taken and held by a stretch nozzle and the weft thread is beat up to the cloth by the sley. Then the change of shed takes place, through which the weft thread is bound in over the entire weaving width. Then the thread must be severed on the insertion side between the main nozzle and the cloth edge which is near it in order to be prepared for the next weft insertion.
In the following the invention will be explained in more detail both in regard to the apparatus and in regard to the method with reference to exemplary embodiments and with reference to the drawings. Shown in the schematic drawings, which are not to scale, are:
FIG. 1: a schematic illustration of essential parts of a jet weaving machine with an exemplary embodiment of the invention,
FIG. 2: a view of the thread supply apparatus,
FIG. 1 shows in a schematic illustration essential parts of a jet weaving machine, especially an air jet weaving machine, which is designated in its entirety by the reference symbol 1 and which comprises an exemplary embodiment of an apparatus in accordance with the invention for the weft insertion. For the sake of clarity, components of the air jet weaving machine which are sufficiently known per se, such as the drive, warp beam, cloth draw-off, weft thread bobbins, are not illustrated.
The apparatus for the weft insertion in accordance with the invention comprises a thread supply apparatus 2 with a winding drum 3. FIG. 2 shows a front view of the thread supply apparatus 2. The winding drum 3 is stationary arranged. A winding apparatus, which can not be recognized in this illustration, draws off the thread from a thread bobbin (not illustrated) and deposits it in the form of a plurality of windings on the outer jacket surface of the winding drum 3 as a thread supply F. From the front end of the winding drum 3 in the illustration the thread supply F can be drawn off as a weft thread S1 and arrives through a guide element 5 at the nozzles for the weft insertion.
In the air jet weaving machine 1 the weft insertion takes place by means of air. In the exemplary embodiment illustrated here, two nozzles which are arranged in series are provided for the acceleration of the weft thread to be inserted, namely a pre-nozzle 10 and a main nozzle 11 (this is illustrated in two different positions A, B in FIG. 1, which will be explained below). Both nozzles are fed with air. In particular in the case of large weaving widths it has proven worthwhile to provide two nozzles 10 and 11 which are arranged one after the other at the weft side, since through this measure the path over which the weft thread S1 to be inserted can be accelerated can be increased.