Method and an apparatus for detecting the weft yarn in a jet loo

Details Method and an apparatus for detecting the weft yarn in a jet loo Method and an apparatus for detecting the weft yarn in a jet loo

1987-06-12

1988-04-19

Jaudon, Henry S.

Textiles: weaving

Stopping

Weft

250561, D03D 5134

Patent

active

047382848

ABSTRACT:
A light reflection type weft detection apparatus for use in a jet loom is disclosed, in which the weft yarn is caused to travel by a jet fluid within a weft guide passage provided along a reed mounted on a slay, and which detection apparatus includes a light emitting section having an optical axis extending in a direction into the weft yarn guide passage, a light receiving section adapted for receiving the light reflected from the weft yarn in said guide passage, and a device for supporting at its end the light emitting and light receiving sections. The supporting device is mounted on the slay at a position in which it is capable of spreading the warp yarn for intruding into the warp shed. As the reed is receded after beating, the supporting device fitted with the light emitting and receiving sections spreads the warp yarns and intrudes into the warp shed being formed by the warp yarns. The weft yarn is detected as the end of the weft yarn travelling through the weft yarn guide passage traverses the optical axes of the light emitting and receiving sections. In case a failure in weft filling has occurred, that is, when the end of the weft yarn does not traverse the optical axes, the loom operation is halted on the basis of weft insertion failure signals from the light emitting and receiving sections.

REFERENCES:
patent: 4471816 (1984-09-01), Wada
patent: 4565224 (1986-01-01), Keller

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