US 4,784,189 AGranted

Device for surveying the insertion of a weft yarn

AssigneeAktiebolaget IRO

InventorJerker Hellstrom

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Abstract

A device for surveying the insertion of a weft yarn in a shed of a jet loom, comprises an arrival sensor arranged at one end of said shed for detecting the arrival of weft yarn there. The arrival sensor and at least one yarn sensor are connected to a surveillance circuit measuring the period of time lapsed since releasing a stopping device and periodically correcting the measured period of time on the basis of the yarn sensor signal. The surveillance circuit only generates a signal indicating the completion of the weft yarn insertion if the following two conditions are simultaneously fulfilled: The measured period of time exceeds a predetermined period of time between 80% and 99.5% of the period of time required for a complete weft yarn insertion cycle, and the arrival sensor generates a signal representing the arrival of the weft yarn.

Claims10

Dependent claims

Device for surveying the insertion of a weft yarn in a shed of a jet loom, comprising an arrival sensor arranged at one end of said shed for detecting the arrival of the weft yarn, the improvement wherein:

said arrival sensor and at least one yarn sensor, the yarn sensor being located in the vicinity of the withdrawal end of a drum of a yarn feeding device for generating a pulse signal indicating that the yarn passes its detection area during the withdrawal of the yarn from the drum, are connected to a surveillance circuit for generating a completion signal indicating the completion of the insertion of said weft yarn into said shed;
said surveillance circuit measures the period of time lapsed since releasing a stopping device;
said surveillance circuit periodically corrects said measured period of time on the basis of said yarn sensor pulse signal;
said surveillance circuit generates said completion signal, indicating the completion of the weft yarn insertion, if both of the two following conditions are fulfilled:
(1) said measured and corrected period of time exceeds a predetermined period of time, said predetermined period of time is set to be 80% to 99.5% of the period of time required for a complete weft yarn insertion, and
(2) said arrival sensor generates a signal representing the arrival of the weft yarn.

3 more elements

said arrival sensor and at least one yarn sensor, the yarn sensor being located in the vicinity of a withdrawal end of a drum of a yarn feeding device for generating a pulse signal indicating that the yarn passes its detection area during the withdrawal of the yarn from the drum, are connected to a surveillance circuit for generating a completion signal indicating the completion of the insertion of said weft yarn into said shed;
said surveillance circuit calculates the actual length of the weft yarn withdrawn from said drum on the basis of the time lapsed since releasing a stopping device;
said surveillance circuit periodically corrects said calculated length on the basis of said yarn sensor pulse signal;
said surveillance circuit generates said completion signal indicating the completion of said weft yarn insertion if both of the following two conditions are fulfilled:
(1) said calculated length exceeds a predetermined length, said predetermined length is set to be between 80% and 99.5% of the overall weft yarn length for one weft yarn shot, and
(2) said arrival sensor generates a signal representing the arrival of the weft yarn.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/165,375Filed 29 Feb 1988 · continuation
Priority: EP 86 107377.330 May 1986
Granted: 15 Nov 1988
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

D03D 47/3066
By gas jet: control or handling of the weft at or after arrival
D03D 47/362
Drum-type weft feeding devices: with yarn retaining devices, e.g. stopping pins
D03D 47/363
With yarn retaining devices, e.g. stopping pins: construction or control of the yarn retaining devices
D03D 47/367
Drum-type weft feeding devices: monitoring yarn quantity on the drum