Weft withdrawing device of air jet loom

Patent metadata

Field	Value
Publication number	US-11078609-B2
Application number	US-202016739955-A
Country	US
Kind code	B2
Filing date	Jan 10, 2020
Priority date	Jan 14, 2019
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

A weft withdrawing device of an air jet loom includes a blow nozzle blowing a weft that is ejected from a weft insertion main nozzle and determined to be a weft insertion failure to guide the weft to a weft withdrawing passage, a weft introducing duct that is integrally swingable with a sley forward and backward, a weft withdrawing mechanism withdrawing the weft guided to the weft introducing duct, and a weft sensor optically detecting the weft. The weft withdrawing device of the air jet loom includes a weft guide member. The weft guide member includes a cloth fell side top portion and a let-off side top portion. The cloth fell side top portion is located above the weft withdrawing passage.

First claim

What is claimed is:

1. A weft withdrawing device of an air jet loom comprising:
a blow nozzle blowing a weft that is ejected from a weft insertion main nozzle and determined to be a weft insertion failure to guide the weft to a weft withdrawing passage adjacent to a weft insertion passage;
a weft introducing duct that is integrally swingable with a sley forward and backward and to which the weft blown and guided to the weft withdrawing passage is introduced;
a weft withdrawing mechanism provided on the weft withdrawing passage, and withdrawing the weft guided to the weft introducing duct by a pair of rollers; and
a weft sensor optically detecting the weft that is withdrawn through the weft withdrawing passage, wherein
the weft withdrawing device of the air jet loom includes a weft guide member having a guide recess to which the weft is introduced and supporting the weft sensor at a position where the weft sensor detects the weft introduced to the guide recess,
the weft guide member includes a cloth fell side top portion having a top portion near a cloth fell and forming the guide recess and a let-off side top portion having a top portion near the warps to be let-off and forming the guide recess, and
the cloth fell side top portion is located above the weft withdrawing passage in a state before the pair of the rollers is brought into press-contact with the weft.

2. The weft withdrawing device of the air jet loom according to claim 1 , wherein
the weft guide member is movable to the weft when the weft is withdrawn by the pair of the rollers.

3. The weft withdrawing device of the air jet loom according to claim 1 , wherein
a distance from a deepest portion of the guide recess to the cloth fell side top portion is shorter than a distance from the deepest portion of the guide recess to the let-off side top portion.

Assignees

• Toyota Jidoshokki Kk

Inventors

• Muroya Haruki
• Arai Ryuji

Classifications

• D03D49/00

  Details or constructional features not specially adapted for looms of a particular type · CPC title

• D03D51/34

  Weft stop motions · CPC title

• D03D47/36 Primary

  Measuring and cutting the weft · CPC title

• D03J1/04

  for treating weft · CPC title

• D03D47/3086 Primary

  Weft removal (extraction of defective weft after stopping at definite point in weaving cycle D03D51/085) · CPC title