Method of contactless optical detection of yarn at a workstation of a yarn manufacturing textile machine, an optical sensor of yarn and a textile machine

Abstract

The invention relates to a method of contactless optical detection of yarn (1) at a workstation of a yarn (1) manufacturing textile machine, in which the yarn (1) moves in a sensing slot (92) between at least one source (90) of radiation and at least one optical sensor means (91) of radiation comprising at least one row of radiation sensitive elements arranged next to each other, whereby shading of the individual radiation sensitive elements by the moving yarn (1) is monitored and the state of the yarn (1) is evaluated on the basis of this monitoring process. The position P of the yarn (1) and / or the time course of the position P of the yarn (1) in the sensing slot (92) is monitored and evaluated, thereby detecting a change delta P in the position P and / or the time course of the change delta P in the position P of the yarn (1) corresponding to a yarn (1) break and upon detecting the break before the broken yarn (1) end passes through the sensing slot (92), a signal to stop the workstation is issued. The invention also relates to an optical sensor of yarn and a textile machine for performing the present invention.

Description

technical field [0001] The invention relates to a method for non-contact optical detection of yarn at a workstation of a yarn manufacturing textile machine, wherein the yarn moves in a sensing slot between at least one radiation source and at least one radiation optical sensor device, the The radiation-optical sensor device comprises at least one row of radiation-sensitive elements arranged next to each other, wherein the shading of the individual radiation-sensitive elements by the moving yarn is monitored and the state of the yarn is evaluated based on this monitoring. [0002] The invention also relates to an optical sensor for a yarn at a workstation of a textile machine for the manufacture of yarn, comprising at least one radiation source and at least one optical sensor device arranged behind a sensing slot in a certain position opposite the radiation source. distance, the sensor device has at least one row of radiation-sensitive elements arranged next to each other, wher...

AI Technical Summary

Problems solved by technology

[0006] It is known to place additional yarn break sensors as close as possible to the collecting trough of the spinning rotor or as close as possible to the spinning nozzles for early detection of breaks and early activation of station stops, but for space and operational reasons , which is often not possible

Furthermore, due to the high speeds at which the yarn moves on modern machines, this trajectory difference in yarn break sensing does not seem to yield sufficient results

[0007] Another possibility for early detection of yarn breakage is to use special sensors to monitor the tension in the yarn, however, this brings further challenges in the form of workstation installation, control of workstation operation, control of service robots at the workstation, etc. shortcoming

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