Recognizing unwanted material in textile fibers
AssigneeMaschinenfabrik Rieter AG
InventorsOskar Oehler, Reinhard Oehler, Robert Demuth, Peter Anderegg
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Abstract
The invention relates to a method of and apparatus for detecting unwanted material in the form of string or woven fabric in a flow of wanted fiber flocks or in a wanted fiber fleece. To this end, the flock flow is guided through a wave field which detects the presence of unwanted material in the flock flow so that the unwanted material can be separated out in a separator facility. The wave field can be an optical or acoustic wave field. The result obtained can, in addition to the separation of the unwanted material, be displayed in display means and/or recorded.
Claims23
A method of recognizing unwanted material in a flow of fiber material under measurement in the textile industry, comprising the steps of:
- producing a predetermined acoustic, ultrasonic wave field, using a wave generator connected to a signal generator, which interacts with the flow of fiber material, said step of producing further including a step of outputting from an ultrasonic transmitter and an ultrasonic pulse generator a pulsed ultrasonic signal;
- receiving, by wave transducers, the wave filed which has been altered due to wave scatter by interaction between the material being measured and the wave field, said step of receiving further including a step of detecting a signal reflected from the unwanted material by an ultrasonic receiver;
- and
- deriving information about the structure of the material being measured from electrical signals generated by the wave transducers, said step of deriving further including a step of analyzing a structure of pattern of the material being measured by means of a correlator on the basis of differences in the pulsed ultrasonic signal and the reflected signal.
An apparatus for the recognition of unwanted material in a flow of textile fiber material in a spinning plant, comprising:
- at least one wave generator for producing an acoustic, ultrasonic wave field;
- at least one wave receiver for measuring the flow of material;
- a correlator for processing a time difference and intensity difference between an ultrasonic pulse and a reflected echo pulse;
- and,
- a wave processor responsive to said correlator for deriving information about the material being measured on the basis of interaction between said flow of material and said wave field.
An apparatus for the recognition of unwanted material in a fiber material being prepared for spinning into textile yarn comprising:
- means for outputting radiation as a pulsed, ultrasonic wave field of a wavelength adapted to the dimensions of the unwanted material;
- means for receiving said radiation as a signal reflected from the unwanted material to detect characteristics of said unwanted material which distinguish said unwanted material from said fiber material, said means for receiving further including a correlator for analyzing a structure or pattern of the material being measured on the basis of differences in the pulsed ultrasonic signal and the reflected signal.
A method for detecting the presence of unwanted material in cotton being prepared for spinning into textile yarn comprising the steps of:
- introducing a mass of cotton fibers to be examined for presence of unwanted material into an acoustic ultrasonic wave field of pulsed waves having a wavelength at least 0.1 millimeters long;
- sensing waves that have been reflected by at least a portion of said mass of fibers to detect waves reflected from unwanted material;
- and
- evaluating whether the sensed waves have predetermined characteristics not attributed to the presence of the cotton fibers in the mass, said step of evaluating further including a step of analyzing a structure or pattern of the material being measured by correlating differences in the pulsed ultrasonic wave and the reflected waves.
Dependencies are inferred from the claim text.