Abstract

Pneumatic weft thread stretching device (1) for air-jet weaving looms comprising an oscillating sley (S) and a reed (R) integral therewith consisting of several adjacent teeth shaped so as to form a weft launch channel (C). A stretching device (1), slidingly mounted on the sley (S) so that it can be fastened in a position at will on said oscillating sley (S), comprises a thinner weft deflecting portion (3i) arranged inside said reed launch channel (C) adjacent to the bottom wall of the same and a thicker portion (3e) facing the reed, said portions (3i, 3e) being partly separated by a cavity (9) wherein picking up of the weft thread takes place. The weft deflecting portion (3i) comprises fixed deviation means to displace the tip of said weft thread (W) from the bottom area of the launch channel (C) towards a nozzle (7) in said picking up cavity (9), said nozzle (7) being fed by a pipe (6) at least partly housed in said thinner portion (3i) and being apt to deliver a compressed air jet into said cavity(9). The thicker portion (3e) facing the reed (R) comprises a catching tube (8) facing said nozzle (7) on the opposite side of said cavity (9) for catching the weft thread (W) from said picking up cavity (9) under the action of said compressed air jet.

IPC Classes  ?

• D03D 47/30 - Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet

Abstract

A control valve unit for air pressure adjustment and air delivery to a relay nozzle in an air jet loom is disclosed. The unit comprises an air inlet (4) and an internal conveying chamber (5) upstream of a delivery duct (7) to a relay nozzle, wherein between said conveying chamber (5) and said delivery duct (7) there are provided at least two calibrated conduits (5a, 5b, 105a, 105b) having different diameter and it further comprises at least shut on/off means suited to close said delivery duct (7) or said calibrated conduits (5a, 5b, 105a, 105b) and pressure adjusting means suited to alternatively close said calibrated conduits (5a, 5b, 105a, 105b).

IPC Classes  ?

• D03D 47/30 - Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet

Goods & Services

(1) Machines, namely weaving machines, looms, rapier weaving machines, air jet weaving machines, projectile weaving machines, series shed weaving machines, hosiery machines, knitting machines, spinning machines and also machines for manufacturing non-wovens, as well as parts for the aforesaid machines, in particular spare parts, prefabricated parts.