Method and arrangement for measuring and/or monitoring properties of yarns or ropes
OwnerRobert Masseninventor
Life of this patent
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Abstract
For measuring and/or monitoring properties of yarns or ropes with the aid of an image sensor a two-dimensional image of a portion of the yarn or rope is acquired and converted to electrical image signals. The image signals are digitized in image point manner and stored in an image signal memory at memory locations assigned to the image points. By a calculating unit the values of the properties to be detected are determined from the stored digital image signals. The properties which can be measured and/or monitored in this manner are in particular the diameter of the yarn or rope, the statistical values of projecting fibres, filaments or wires and the twist of the yarn or rope.
Claims21
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of:
- (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals;
- (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image;
- (c) storing the digital image signals in an image signal memory for which each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored;
- and
- (d) determining the number of twists per unit length or the length of a twist of the yarn or rope from the stored digital image signals using a calculating unit by determining the period of the structure of the yarn or rope in an evaluation direction which is parallel to the longitudinal direction of the yarn or rope.
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of:
- (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals;
- (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image;
- (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored;
- and
- (d) determining the mean fibre angle of the individual fibres of the yarn or rope from the stored digital image signals using a calculating unit.
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of:
- (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals;
- (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image;
- (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored;
- and
- (d) determining the diameter of the yarn or rope from the stored digital image signals using a calculating unit by counting the number of image points belonging to the image of the yarn or rope along one or more lines extending transversely of the longitudinal axis of the yarn or rope.
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of:
- (a) taking a two-dimension image of a portion of the yarn or rope by using an image sensor which converts the image to electrical image signals;
- (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image;
- (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored;
- and
- (d) determining the diameter of the yarn or rope from the stored digital image signals using a calculating unit by determining the ratio of the total number of image points belonging to the image of the yarn or rope to the total number of the image points of the two-dimensional image.
A method of measuring and/or monitoring properties of a yarn comprising the steps of:
- (a) taking a two-dimensional image of a portion of the yarn or rope using an image sensor which converts the image to electrical image signals;
- (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the image;
- (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional image has a memory location at which the complete digital image signal of the respective image point can be stored;
- and
- (d) determining statistical values of projecting filaments or wires from the stored digital image signals using a calculating unit by counting the image points belonging to the projecting filaments or wires in one or more test strips extending parallel to the image of the yarn or rope.
A method of measuring and/or monitoring properties of a yarn or rope comprising the steps of:
- (a) taking two or more two-dimensional images of a portion of the yarn or rope from different angles using image sensors which convert the images to electrical image signals;
- (b) digitizing the image signals to provide digital image signals each of which corresponds to an image point of the images;
- (c) storing the digital image signals in an image signal memory which for each image point of the two-dimensional images has a memory location at which the complete digital image signal of the respective image point can be stored;
- (d) determining the diameter of the yarn or rope from the stored digital image signals of each two-dimensional image using a calculating unit;
- and
- (e) determining the unroundness of the yarn or rope using the calculating unit by comparing the diameters obtained for the different two-dimensional images.
Dependencies are inferred from the claim text.