Automatic winder
AssigneeMurata Kikai Kabushiki Kaisha
InventorsYutaka Ueda, Shuzo Kawamura, Toshio Yamauchi, Yoshiyuki Ichiba
Life of this patent
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Abstract
In an automatic winder having a plurality of winding units, a tension sensor for detecting the tension of yarn is provided in a yarn travelling path extending between a yarn feed side bobbin and a take-up side package. A take-up controller for controlling the yarn take-up rate in accordance with a signal provided from the tension sensor may be provided to the winding unit.
Claims11
An automatic winder having at least one winding unit for performing a winding operation by drawing out yarn from a bobbin, conveying the yarn along a yarn path and winding the yarn onto a package said at least one winding unit comprising:
- a transverse drum for rotating said package;
- a yarn defect detection means for detecting a defect in said yarn;
- a tension device for detecting the tension of said yarn during said winding operation, said tension device comprising:
- a base;
- a piezoelectric element;
- and
- a guide means having a yarn contacting portion integral with said piezoelectric element for urging said piezoelectric element against said base,
- said yarn contact portion of said guide being located between said traverse drum and said yarn defect detection means.
An automatic winder having at least one winding unit, operable with a traverse drum, for performing a winding operation by drawing out yarn from a bobbin, conveying the yarn along a yarn path, and winding the yarn onto a package, said at least one winding unit comprising:
- a tension device for imparting a tension to said traveling yarn;
- a yarn cutting device operable for cutting said yarn in said yarn path;
- a tension detecting device for detecting yarn tension and yarn breakage;
- a control circuit having twining detecting means for detecting the twining of broken yarn around said traverse drum, the control circuit being operative in response to said tension detecting device and said twining detection means detecting an occurrence of a yarn breakage and twining of broken yarn around said traverse drum for providing a cutter driving signal to activate said yarn cutting device.
A winding unit for performing a yarn winding operation by drawing out yarn from a bobbin along a yarn path add winding the yarn onto a package, said winding unit comprising:
- a yarn tension sensing means having a preset yarn tension range, said yarn tension sensing means for sensing the tension of said yarn occurring outside of said preset yarn tension range;
- an independent yarn presence detection means operable independent of said yarn tension sensing means for detecting yarn presence in said yarn path;
- and
- a yarn cutting means, responsive to both said tension of said yarn occurring outside of said present yarn tension range and to the presence of said yarn in said yarn path, for cutting yarn in said yarn path.
A winding unit for drawing out yarn from a bobbin along a yarn path and winding the yarn onto a package, said winding unit comprising:
- detection means for detecting the presence of the yarn in the yarn path;
- tension sensing means operable independent of the detection means for sensing the tension of the yarn in the yarn path;
- and
- cutting means, responsive to both the tension sensing means and the detection means, for cutting the yarn in the yarn path.
A winding unit for drawing out yarn from a bobbin along a yarn path under tension, said winding unit comprising:
- detection means for detecting the presence of the yarn in the yarn path;
- tension sensing means for sensing tension of the yarn in the yarn path falling outside of the predetermined range, said tension sensing means being operable independent of the detection means;
- cutting means, responsive to the combination of the tension sensing means and the detection means, for cutting the yarn in the yarn path;
- whereby the yarn is cut when the tension of the yarn in the yarn path falls outside a predetermined range.
A system for drawing out yarn from a bobbin along a yarn path under tension, said system comprising the steps of:
- detecting the tension of said yarn occurring outside of a preset tension range;
- detecting the presence of said yarn in said yarn path independent of the step of detecting the tension in the yarn;
- cutting the yarn in said yarn path in response to the detecting of both said tension occurring outside said present tension range and said presence of said yarn in said yarn path.
Dependencies are inferred from the claim text.