Use of microwaves for sensors in the spinning industry
First Claim
1. A method for determining band mass of an elongated, substantially non-twisted fiber structure in a textile spinning machine, comprising subjecting the fiber structure to microwaves such that a characteristic change of the microwaves is induced by the fiber structure, detecting and processing the changed microwave characteristic to calculate the band mass of the scanned fiber structure, and adjusting the band mass as a function of moisture content of the fiber structure, wherein a relatively constant base fiber moisture is assumed for the fiber structure, and the band mass is adjusted based on the assumed fiber moisture.
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Accused Products
Abstract
The invention uses microwaves in the spinning industry in order to determine the band mass of an elongated, substantially non-twisted fiber structure. In addition, a method for measuring the sliver mass from the frequency detuning and the damping of resonance signals of a microwave sensor while taking into consideration the moisture of the fiber structure with a computer is suggested. Likewise, a corresponding spinning preparation machine and a laboratory device for measuring the sliver mass are part of the invention. Lastly, a method and a spinning preparation machine for recognizing foreign matter in a moved fiber structure with the aid of microwaves is suggested.
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Citations
53 Claims
- 1. A method for determining band mass of an elongated, substantially non-twisted fiber structure in a textile spinning machine, comprising subjecting the fiber structure to microwaves such that a characteristic change of the microwaves is induced by the fiber structure, detecting and processing the changed microwave characteristic to calculate the band mass of the scanned fiber structure, and adjusting the band mass as a function of moisture content of the fiber structure, wherein a relatively constant base fiber moisture is assumed for the fiber structure, and the band mass is adjusted based on the assumed fiber moisture.
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10. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator at an inlet or an outlet of the drafting device such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuning and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and generating a signal when fluctuations in monitored band mass at the drafting device exceeds established threshold values, such that said signal is used to emit a warning signal or stop operation of the spinning preparation machine. - View Dependent Claims (11, 12, 14, 15, 21, 22, 23, 24, 25, 26, 27, 29)
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13. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuninq and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and detecting breaks in the scanned fiber structure.
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16. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuning and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and wherein a rate of detection of the varied resonance frequency of the microwaves from the resonator is coordinated with a conveying speed of the fiber structure. - View Dependent Claims (53)
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17. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuning and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and wherein a rate of detection of the varied resonance frequency of the microwaves from the resonator is set at a fixed scanning length of fiber structure.
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18. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varyinq band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuning and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and wherein a rate of detection of the varied resonance frequency of the microwaves from the resonator is set at a fixed time interval that is a function of conveying speed of the fiber structure.
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19. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuninq and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and wherein overlapping longitudinal sections of the fiber structure are successively scanned with the microwaves.
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20. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuning and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and generating or supplementing a spectrogram of the scanned fiber structure with measurements from the microwave sensor.
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28. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuninq and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and wherein the several fiber slivers are conveyed in at least two groups through the resonator and the groups of fiber slivers are conveyed toward each other after the resonator and conveyed substantially parallel to each other into the drafting device.
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30. A method for determining band mass of a fiber structure conveyed through a spinning preparation machine having a drafting device with successive draw parts for drawing the fiber structure, said method comprising:
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with a microwave sensor, coupling microwaves into a microwave resonator, the microwaves having a variable self resonance; conveying the fiber structure through the microwave resonator such that the self resonance of the microwaves varies as a function of varying band mass and moisture of the conveyed fiber structure; detecting the varied self resonance of the microwaves and evaluating for frequency detuning, and damping of the varied self resonance frequency as a result of influencing the microwaves with the fiber structure; calculating band mass of the scanned fiber structure from the frequency detuning and damping, the band mass calculation being adjusted for by moisture of the scanned fiber structure; processing the fiber structure with the drafting device as a function of the calculated band mass; and periodically cleaning the resonator with a pressurized or vacuum air source.
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31. A textile fiber spinning preparation machine that processes a fiber structure as a function of band mass of the fiber structure conveyed through said machine, comprising:
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a microwave sensor, said microwave sensor further comprising a microwave generator configured to produce variable frequency microwaves; a microwave resonator coupled with said microwave generator, said resonator including a specimen volume structure through which the fiber is conveyed; a microwave detector disposed to detect microwaves coupled out of said resonator; an evaluation unit in communication with said detector and configured to evaluate microwave resonance signals to calculate band mass of the fiber structure from said resonance signals, said evaluation unit compensating said calculated band mass as a function of fiber structure moisture; and wherein said microwave generator supplies microwaves having at least two differing frequencies to said resonator, and said evaluation unit comprises circuitry that detects resonance frequency shifts of the microwaves by comparing resonance curves influenced by the scanned fiber structure with resonance curves of uninfluenced microwaves in said resonator, said evaluation unit detecting damping by comparing amplitudes of the influenced resonance curves with the resonance curves not influenced by the fiber structure. - View Dependent Claims (32, 33, 34, 35, 38, 39, 40, 41, 45, 47, 48, 49)
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36. A textile fiber spinning preparation machine that processes a fiber structure as a function of band mass of the fiber structure conveyed through said machine, comprising:
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a microwave sensor, said microwave sensor further comprising a microwave generator configured to produce variable frequency microwaves; a microwave resonator coupled with said microwave generator, said resonator including a specimen volume structure through which the fiber is conveyed; a microwave detector disposed to detect microwaves coupled out of said resonator; and an evaluation unit in communication with said detector and configured to evaluate microwave resonance signals to calculate band mass of the fiber structure from said resonance signals, said evaluation unit compensating said calculated band mass as a function of fiber structure moisture; and guide elements disposed at an inlet and an outlet of said microwave sensor for conveying the fiber structure under tension through said microwave sensor. - View Dependent Claims (37)
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42. A textile fiber spinning preparation machine that processes a fiber structure as a function of band mass of the fiber structure conveyed through said machine, comprising:
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a microwave sensor, said microwave sensor further comprising a microwave generator configured to produce variable frequency microwaves; a microwave resonator coupled with said microwave generator, said resonator including a specimen volume structure through which the fiber is conveyed; a microwave detector disposed to detect microwaves coupled out of said resonator; and an evaluation unit in communication with said detector and configured to evaluate microwave resonance signals to calculate band mass of the fiber structure from said resonance signals, said evaluation unit compensating said calculated band mass as a function of fiber structure moisture; and a drafting device for drafting the fiber structure as a function of the calculated band mass, the fiber structure defined by a plurality of adjacently conveyed fiber slivers, and deflection elements disposed between said microwave sensor and said drafting device such that the fiber slivers maintain substantially the same relative position with respect to each other from said microwave sensor to said drafting device. - View Dependent Claims (43, 44)
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46. A textile fiber spinning preparation machine that processes a fiber structure as a function of band mass of the fiber structure conveyed through said machine, comprising:
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a microwave sensor, said microwave sensor further comprising a microwave generator configured to produce variable frequency microwave; a microwave resonator coupled with said microwave generator, said resonator including a specimen volume structure through which the fiber is conveyed; a microwave detector disposed to detect microwaves coupled out of said resonator; and an evaluation unit in communication with said detector and configured to evaluate microwave resonance signals to calculate band mass of the fiber structure from said resonance signals, said evaluation unit compensating said calculated band mass as a function of fiber structure moisture; and wherein said specimen volume structure is movable to various operating positions.
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- 50. A method for detecting foreign matter in a fiber structure conveyed through a textile spinning machine, comprising subjecting the fiber structure to microwaves such that a characteristic change of the microwaves is induced by the fiber structure, and detecting and processing the changed microwave characteristic to detect the presence of foreign matter in the fiber structure.
Specification