Method of obtaining a thread running signal
First Claim
1. A method of measuring the tension in a running thread on a textile machine having means for winding said running thread, a thread guide for guiding said thread and a sensor connected to said thread guide for sensing oscillations of said thread guide, said sensor comprising a piezofoil disposed in a plane which is parallel to a plane in which said running thread is situated, comprising the steps of:
- (a) supplying a running thread to said textile machine;
(b) winding said running thread onto a cop;
(c) passing said running thread through said thread guide;
(d) sensing oscillations of said thread guide and producing a signal corresponding to said oscillations and the tension in said running thread; and
(e) filtering said signal to obtain elements of said signal corresponding to a basic frequency of operation of said winding means or an harmonic thereof and obtaining from said filtered out frequency a signal corresponding to said tension in said running thread.
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Accused Products
Abstract
In a method of obtaining a thread tension signal a sensor in the form of a piezofoil is attached to a thread guide or to its mounting and delivers a signal which reflects, amongst other things, the oscillations induced in the thread guide by the thread movement. In order to obtain a signal which corresponds to the thread tension either the frequency of an element which winds up the thread and/or harmonics of this frequency is filtered out of the sensor signal and the level of this frequency or the level of these frequencies is measured.
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Citations
19 Claims
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1. A method of measuring the tension in a running thread on a textile machine having means for winding said running thread, a thread guide for guiding said thread and a sensor connected to said thread guide for sensing oscillations of said thread guide, said sensor comprising a piezofoil disposed in a plane which is parallel to a plane in which said running thread is situated, comprising the steps of:
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(a) supplying a running thread to said textile machine; (b) winding said running thread onto a cop; (c) passing said running thread through said thread guide; (d) sensing oscillations of said thread guide and producing a signal corresponding to said oscillations and the tension in said running thread; and (e) filtering said signal to obtain elements of said signal corresponding to a basic frequency of operation of said winding means or an harmonic thereof and obtaining from said filtered out frequency a signal corresponding to said tension in said running thread. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A thread tension sensor for sensing tension in a running thread on a textile machine which has a winding element that is operable at least one basic frequency for winding said running thread onto a package, comprising:
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(a) a thread guide for guiding said running thread on said textile machine; (b) mounting means for supporting said thread guide on said textile machine to permit said thread guide to oscillate; (c) a piezofoil sensing element disposed on said thread guide in a plane which is parallel to a plane through which said running thread passes for generating an electrical signal corresponding to oscillations of said thread guide; (d) a tune filter for filtering said electrical signal to produce and transmit an output signal; (e) means for tuning said filter in accordance with the prevailing basic frequency of said winding element or an harmonic frequency of said prevailing frequency; and (f) means for measuring the level of said output signal corresponding to the level of tension in said running thread. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification