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AssigneeLindauer Dornier Gesellschaft mbH
InventorsAdnan Wahhoud, Matthias Armbrust
Estimating the term…
The filaments in a weft thread or yarn in a pneumatic loom are tangled and consolidated to prevent untangling of the weft thread when it is transported, after the tangling, through the weft insertion channel in a loom shed. For this purpose the leading end of the weft thread is temporarily stopped in a weft insertion nozzle pipe by a first air stream the so-called holding air stream (19) with a first pressure (P1) between two weaving cycles following each other for holding the weft thread stretched. At the same time a second air stream (20) having a higher pressure (P2) than the first pressure (P1) and a different flow direction than the first air stream (19) is applied to or along a leading end portion of the weft thread for tangling the filaments and thereby locking or consolidating the filaments in the weft thread. Each weft insertion nozzle pipe has a first port and a second port through which the first and second air streams are introduced into the weft insertion the nozzle pipe. The second port is positioned downstream of the first port and closer to a free exit end (15) of the respective weft insertion nozzle pipe but still spaced from the free exit end.
A method for tangling filaments of a weft yarn at least in a certain length section next to a leading end of said weft yarn for consolidating said filaments in the weft yarn on a loom with a pneumatic weft insertion and with at least one weft insertion nozzle pipe through which said weft yarn is driven in each weaving cycle for passing said weft yarn through a weft insertion channel of a reed in said loom, said method comprising the following steps:
A weaving loom comprising at least one weft insertion nozzle pipe and weft insertion means for passing a weft yarn through said weft insertion nozzle pipe (2), said weft insertion nozzle pipe including a weft inlet and a weft outlet, a first pressure source (PS1) for providing a first pressure (P1), a first pressure conduit (10) connecting said first pressure source to a first port in said weft insertion nozzle pipe, a first program controllable valve (V1) in said first pressure conduit (10) for controlling a first air stream (19) directed for temporarily holding a weft thread stretched during a predetermined time duration between two weaving cycles following each other, a second pressure source (PS2) for providing a second pressure (P2) higher than said first pressure (P1), a second pressure conduit (27) connecting said second pressure source (PS2) to a second port in said weft insertion nozzle pipe downstream of said first port, a second program controllable valve (V3) in said second pressure conduit (27) for controlling a second air stream (20) directed for entangling filaments of said weft yarn.
Dependencies are inferred from the claim text.