Method, system and computer program for detecting defects in a knitted fabric manufactured by an automatic circular knitting machine, wherein: a camera is provided in a fixed position inside the top part of the knitted fabric and captures images of the fabric; said data then used for automatically determining the presence of defects in the fabric by comparing with data from a reference fabric that is free of defects.
G01B 11/25 - Dispositions pour la mesure caractérisées par l'utilisation de techniques optiques pour mesurer des contours ou des courbes en projetant un motif, p. ex. des franges de moiré, sur l'objet
D04B 9/02 - Métiers circulaires pour le tricotage de trame avec des aiguilles mobiles indépendantes avec une fonture
D04B 35/20 - Dispositifs indicateurs, avertisseurs ou de sécurité, p. ex. mouvements d'arrêt sensibles aux défauts, p. ex. trous, dans les articles tricotés
2.
METHOD FOR ADJUSTING AN AUTOMATIC KNITTING MACHINE FOR PLATING KNITTING, AND CORRESPONDING SYSTEM
Method and system for adjusting an automatic knitting machine for plating knitting comprising a plurality of movable needles (2) and yarn feeding means (3) with two guides (5a, 5b) for feeding two different yarns (4a, 4b) to a same operating needle (22). A digital camera captures image frames of an area including at least a portion of straight sections (6a, 6b) of the two yarns (4a, 4b) between the guides (5a, 5b) and the operating needle (22). An automatic image recognition is performed in the image frames to recognize the portions of the straight sections (6a, 6b), and directions of these straight sections (6a, 6b) are automatically derived. A relative position of the guides (5a, 5b) is adjusted in function of these directions.
D04B 35/10 - Dispositifs indicateurs, avertisseurs ou de sécurité, p. ex. mouvements d'arrêt
D04B 9/34 - Métiers circulaires pour le tricotage de trame avec des aiguilles mobiles indépendantes pour la production de tricots à dessins avec dessins de couleur par vanisage
D04B 37/02 - Appareils ou dispositifs auxiliaires employés avec les métiers à tricoter avec des métiers à tricoter trame
3.
METHOD FOR DETECTING WEAR IN THE SINKERS OF AN AUTOMATIC KNITTING MACHINE, AND CORRESPONDING SYSTEM AND SINKER
Method for detecting wear in the sinkers of an automatic knitting machine, and corresponding system and sinker. A conductive track (5) is applied on a friction area (6) of a testing sinker (4a) that replaces a normal sinker in an automatic knitting machine. By means of an electrical testing device (7) that is connected to the terminals (8) of the conductive track (5), at least one parameter related to an electrical resistance of the conductive track (5) is automatically measured, and in function of this parameter, a level of wear in the friction area (6) of the testing sinker (4a) is automatically deduced.
Method, system and computer program for detecting defects in the sinkers of an automatic knitting machine comprising needles and sinkers, wherein: a digital camera captures digital image frames of a group of working sinkers; an automatic image recognition is carried out to determine a pattern jointly defined by the sinkers; at least one parameter is automatically derived from the pattern; a deviation of said parameter from a predetermined reference is automatically calculated; and in function of said deviation, the presence of a defect in the group of sinkers is automatically determined.
Method, system and computer program for detecting defects in the needles of an automatic knitting machine, wherein: a digital camera captures digital image frames of a group of working needles; an automatic image recognition is carried out to determine a first pattern jointly defined by the needles and/or a second pattern defined by a length of yarn interacting with the needles; at least one parameter is automatically derived from the first or second pattern; a deviation of said parameter from a predetermined reference is automatically calculated; and in function of said deviation, the presence of a defect in the group of needles is automatically determined.
D04B 35/18 - Dispositifs indicateurs, avertisseurs ou de sécurité, p. ex. mouvements d'arrêt sensibles à la rupture, la mauvaise position ou le fonctionnement défectueux de mécanismes de tricotage