Method and device for determining the orientation of a cross-wound bobbin tube
AssigneeOerlikon Textile GmbH & Co. KG
InventorHeinz-Dieter Gobbels
Life of this patent
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Abstract
A method and device for determining the orientation of a cross-wound bobbin tube (1) having a yarn draw-off end face (27) configured as a tube tip (2) with a beaded edge (4) and an opposite end face (27) configured as a tube foot (3) without a beaded edge (4). A digital image of an end face (27) of the bobbin tube (1) is detected, the digital image is subjected to an edge detection to determine the object edges (6, 7, 8, 9) of the tube (1), a recognition parameter dependent on the width (b1, b2) of the circular ring (10, 11) formed by the object edges (6, 7, 8, 9) is determined, this recognition parameter is compared with a reference value and a conclusion is drawn about the orientation of the bobbin tube (1) depending on the result of the comparison.
Claims14
A method for determining the orientation of a bobbin tube (1) of the type for cross-winding of a textile yarn thereon, wherein the bobbin tube has one end face (27) at a yarn withdrawal end of the tube configured as a tube tip (2) with a beaded edge (4) and has another end face (27) at the opposite end of the tube configured as a tube foot (3) without a beaded edge (4), the method characterized by the steps of arranging the cross-wound bobbin tube (1) opposite an image detection mechanism, detecting a digital image of one end face (27) of the cross-wound bobbin tube (1), subjecting the digital image to an edge detection in order to determine object edges (6, 7, 8, 9) of the cross-wound bobbin tube (1), determining a recognition parameter which is dependent on a width (b1, b2) of a circular ring (10, 11) formed by the object edges (6, 7, 8, 9), comparing the recognition parameter thusly determined with a reference value which is dependent on the tube parameters, and drawing a conclusion about the orientation of the cross-wound bobbin tube (1) depending on the result of the comparison.
A method for determining the orientation of a bobbin tube (1) of the type for cross-winding of a textile yarn thereon, wherein the bobbin tube has one end face (27) at a yarn withdrawal end of the tube configured as a tube tip (2) with a beaded edge (4) and has another end face (27) at the opposite end of the tube configured as a tube foot (3) without a beaded edge (4), the method characterized by the steps of arranging the cross-wound bobbin tube (1) opposite an image detection mechanism, detecting a digital image of one end face (27) of the cross-wound bobbin tube (1), subjecting the digital image to an edge detection in order to determine object edges (6, 7, 8, 9) of the cross-wound bobbin tube (1), determining a recognition parameter which is dependent on a width (b1,12) of a circular ring (10, 11) formed by the object edges (6, 7, 8, 9), wherein the recognition parameter is selected as the quotient of an external diameter (D) of the bobbin tube (1) and the width (b1, b2) of the circular ring (10, 11), comparing the recognition parameter thusly determined with a reference value which is dependent on the tube parameters, and drawing a conclusion about the orientation of the cross-wound bobbin tube (1) depending on the result of the comparison.
A method for determining the orientation of a bobbin tube (1) of the type for cross-winding of a textile yarn thereon, wherein the bobbin tube has one end face (27) at a yarn withdrawal end of the tube configured as a tube tip (2) with a beaded edge (4) and has another end face (27) at the opposite end of the tube configured as a tube foot (3) without a beaded edge (4), the method characterized by the steps of arranging the cross-wound bobbin tube (1) opposite an image detection mechanism, detecting a digital image of one end face (27) of the cross-wound bobbin tube (1), subjecting the digital image to an edge detection in order to determine object edges (6, 7, 8, 9) of the cross-wound bobbin tube (1), determining a recognition parameter which is dependent on a width (b1, b2) of a circular ring (10, 11) formed by the object edges (6, 7, 8, 9), comparing the recognition parameter thusly determined with a reference value which is dependent on the tube parameters, and drawing a conclusion about the orientation of the cross-wound bobbin tube (1) depending on the result of the comparison, and characterized further by representing the digital image by a grey scale value matrix, wherein each element of the grey scale value matrix allocates a grey scale value to a pixel, determining an edge matrix from the grey scale value matrix for edge detection, each element of the edge matrix allocating a value to a pixel for associating respective pixels to respective object edges, determining the center point (12) of circles formed by the object edges (6, 7, 8, 9) by means of the edge matrix, and detecting line profiles which provide elements of the edge matrix, the pixels of which lie on a straight line (13, 14, 15, 16, 17), wherein one of the straight lines (13) belonging to the line profiles runs through the center point (12) of the circles formed by the object edges (6, 7, 8, 9), the straight lines (14, 15, 16, 17) of the other line profiles run parallel with the straight line (13) through the center point (12) and through pixels adjacent to the center point (12) and the sum of the line profiles is formed.
A device for determining the orientation of a bobbin tube (1) of the type for cross-winding of a textile yarn thereon, wherein the bobbin tube has one end face (27) at a yarn withdrawal end of the tube configured as a tube tip (2) with a beaded edge (4) and has another end face (27) at the opposite end of the tube configured as a tube foot (3) without a beaded edge (4), characterized in that the device comprises an image processing mechanism in the form of a digital camera (22), means for orienting the digital camera (22) and the bobbin tube (1) relative to one another such that a digital image of an end face (27) of the cross-wound bobbin tube (1) can be detected, and an evaluation mechanism (23) configured to subject the digital image to an edge detection in order to determine object edges (6, 7, 8, 9) of the cross-wound bobbin tube (1), to determine a recognition parameter which is dependent on a width (b1, b2) of a circular ring (10, 11) formed by the object edges, to compare the recognition parameter with a reference value which is dependent on the tube parameters and to draw to a conclusion about the orientation of the bobbin tube (1) depending on the result of the comparison.
A method for determining the orientation of a bobbin tube (1) of the type for cross-winding of a textile yarn thereon, wherein the bobbin tube has one end face (27) at a yarn withdrawal end of the tube configured as a tube tip (2) with a beaded edge (4) and has another end face (27) at the opposite end of the tube configured as a tube foot (3) without a beaded edge (4), the method characterized by the steps of arranging the cross-wound bobbin tube (1) opposite an image detection mechanism, detecting a digital image of one end face (27) of the cross-wound bobbin tube (1), subjecting the digital image to an edge detection in order to determine object edges (6, 7, 8, 9) of the cross-wound bobbin tube (1), determining a recognition parameter which is dependent on a width (b1, b2) of a circular ring (10, 11) formed by the object edges (6, 7, 8, 9), wherein the recognition parameter is selected as the quotient of an internal diameter (d1, d2) and an external diameter (D) of the bobbin tube (1), comparing the recognition parameter thusly determined with a reference value which is dependent on the tube parameters, and drawing a conclusion about the orientation of the cross-wound bobbin tube (1) depending on the result of the comparison.
A method for determining the orientation of a bobbin tube (1) of the type for cross-winding of a textile yarn thereon, wherein the bobbin tube has one end face (27) at a yarn withdrawal end of the tube configured as a tube tip (2) with a beaded edge (4) and has another end face (27) at the opposite end of the tube configured as a tube foot (3) without a beaded edge (4), the method characterized by the steps of arranging the cross-wound bobbin tube (1) opposite an image detection mechanism, detecting a digital image of one end face (27) of the cross-wound bobbin tube (1), subjecting the digital image to an edge detection in order to determine object edges (6, 7, 8, 9) of the cross-wound bobbin tube (1), determining a recognition parameter which is dependent on a width (b1, b2) of a circular ring (10, 11) formed by the object edges (6, 7, 8, 9), wherein the recognition parameter is selected as the quotient of an internal diameter (d1, d2) of the bobbin tube (1) and the width (b1, b2) of the circular ring (10, 11), comparing the recognition parameter thusly determined with a reference value which is dependent on the tube parameters, and drawing a conclusion about the orientation of the cross-wound bobbin tube (1) depending on the result of the comparison.
Dependencies are inferred from the claim text.