Method for determining a distortion angle in a textile material and an apparatus for use therein
First Claim
1. A method of determining a distortion angle in a textile material comprising the steps of:
- feeding the material in a specific direction;
providing a first detection means capable of generating a first output signal dependent on an angular position of the first detection means with respect to said specific feeding direction of the material and to the distortion angle;
monitoring the material with said first detection means to provide said first output signal;
providing a filtering means for the first output signal, which filtering means comprises a band-pass filter defining a band-pass curve which is adjustable with respect to at least one of its center bandpass frequency, its bandwidth, and its filter-curve shape;
filtering the first output signal using said filtering means so that components of said first output signal which are at least statistically independent of the distortion angle are filtered out of said output signal;
providing a second detection means capable of generating a second output signal dependent on the frequency characteristic of signal components in said first output signal that are at least statistically dependent on the distortion angle;
inputting said second output signal to said filtering means so that said band-pass curve can be adjusted with respect to said distortion-angle-dependent signal components; and
using an output signal from the filtering means to determine said distortion angle.
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Abstract
To order to determine a distortion angle in a textile material fed in a specific feeding direction, the textile material is monitored by means of a first detection means, the output signal of which depends on an angular position of said means with respect to the feeding direction and to the distortion angle. This first output signal is filtered so that signal components that are at least statistically independent of the distortion angle are filtered out. The filtering means used comprise a band-pass filter which is adjustable with respect to its center band-pass frequency, its bandwidth and/or the shape of its filter-curve shape by means of a second output signal from a second detection means. The second output signal is dependent on the frequency characteristic of those signal components in the first output signal that are at least statistically dependent on the distortion angle. In this way the band-pass curve of the filtering means can be adjusted to the distortion-angle-dependent signal components, so that the distortion angle can be ascertained with greater accuracy than hitherto.
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Citations
25 Claims
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1. A method of determining a distortion angle in a textile material comprising the steps of:
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feeding the material in a specific direction; providing a first detection means capable of generating a first output signal dependent on an angular position of the first detection means with respect to said specific feeding direction of the material and to the distortion angle; monitoring the material with said first detection means to provide said first output signal; providing a filtering means for the first output signal, which filtering means comprises a band-pass filter defining a band-pass curve which is adjustable with respect to at least one of its center bandpass frequency, its bandwidth, and its filter-curve shape; filtering the first output signal using said filtering means so that components of said first output signal which are at least statistically independent of the distortion angle are filtered out of said output signal; providing a second detection means capable of generating a second output signal dependent on the frequency characteristic of signal components in said first output signal that are at least statistically dependent on the distortion angle; inputting said second output signal to said filtering means so that said band-pass curve can be adjusted with respect to said distortion-angle-dependent signal components; and using an output signal from the filtering means to determine said distortion angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for use in the determination of a distortion angle in a textile material being fed in a specific direction, comprising:
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a first detection means capable of producing a first output signal dependent on an angular position of said first detection means with respect to said specific feeding direction and to the distortion angle; a filtering means comprising a band-pass filter defining a band-pass curve which is adjustable with respect to at least one of its center band-pass frequency, its bandwidth, and its filter-curve shape, said filtering means being capable of filtering out of said first output signal components that are at least statistically independent of the distortion angle; and a second detection means capable of producing a second output signal dependent on the frequency characteristic of signal components in said first output signal that are at least statistically dependent on the distortion angle and of sending said second output signal to said filtering means so that said band-pass curve can be adjusted with respect to said distortion-angle-dependent signal components. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification