A method and apparatus for controlling a jet loom

Abstract

A method for controlling a jet loom (1) is proposed. The jet loom (1) contains a plurality of relay nozzles (33) arranged along a fluid feed conduit (8). A weft yarn (93) is introduced into the fluid feed conduit (8), the relay nozzles (33) are actuated so as to eject time- staggered fluid pulses which produce a fluid flow in the fluid feed conduit (8), and the weft yarn (93) is conveyed by the fluid flow through the fluid feed conduit (8). The relay nozzles (33) are actuated based on a local distribution of characteristics within the respectively conveyed weft yarn section (93). Thus, the energy and air consumption of the jet loom (1) are reduced and the productivity of the jet loom (1) is increased

Description

technical field [0001] The invention according to the preambles of the independent claims relates to a method and a device for controlling a jet loom. Background of the invention [0002] So-called yarn clearers are used in spinning machines or bobbin winding machines to ensure yarn quality. Such a device is known, for example, from EP-0'439'767A2. It includes a measuring head with at least one sensor that scans the moving yarn. Commonly used sensor principles are capacitive (see eg EP-0'924'513A1) or optical (see eg WO-93 / 13407A1). [0003] It has been proposed to scan the yarn with different sensors and to combine the different sensor signals for evaluation. For example US-6,798,506 B2 teaches to arrange two sensors, one behind the other along the yarn path. The first sensor measures the optical reflection from the yarn; the second sensor measures the mass or diameter of the yarn capacitively or optically, respectively. The output signals of the two sensors are evalua...

AI Technical Summary

Problems solved by technology

As a reaction to the detection signal, a temporary change in the supply pressure of the blowing nozzle is caused

Images