Weft insertion in jet loom

Details Weft insertion in jet loom Weft insertion in jet loom

1989-05-02

1990-05-01

Falik, Andrew M.

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

D03D 4734, D03D 4712

Patent

active

049210190

ABSTRACT:
A jet loom comprising a weft measuring roller for continuously drawing out a weft from a supply package, a weft storage unit for temporarily accumulating and storing the weft drawn out from the supply package by the weft measuring roller, a main nozzle for jetting air to insert the weft into the warp shed, and a driving unit for sinusoidally varying the rotating speed of the weft measuring roller. The weft stored in the weft storage unit runs in a free running period in a free running mode at a comparatively high running speed. After the stored weft has exhausted, the weft is supplied for insertion directly from the weft measuring roller, so that the weft runs in a constrained running mode at a running speed constrained by the surface speed of the weft measuring roller. When the running mode of the inserted weft changes from the free running mode to the constrained running mode, the driving unit drives the weft measuring roller so that the surface speed of the weft measuring roller is higher than a speed Vf defined by: Vf=Lo/tc, where Lo is the weft length of the loom and tc is a time necessary for one weaving cycle of the loom.

REFERENCES:
patent: 3580444 (1972-05-01), Van Mullekom
patent: 3865149 (1975-02-01), Keldany
patent: 4000762 (1977-01-01), Mizuno
patent: 4479518 (1984-10-01), Kiwior

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