Abstract: The apparatus detects corduroy cutter needles coming out of the weft yarn loop channels which are being cut open by the needles, by means of a laser beam scanning about 10 to 20 times a second, transversely across the region where the parallel needles are working. The scanning laser beam creates a diffused light pattern having the general form of a transversely oriented geometric prism, e.g. a cylinder; and a plurality of detector devices determines any variation in the light distribution, as to time and lateral distance, in this scattered or diffused light pattern. A logic circuit carries out and displays the results of the scanning and detecting, and stops the corduroy cutting machine when an emerged needle is detected.
Type:
Grant
Filed:
July 14, 1987
Date of Patent:
October 3, 1989
Assignee:
Leglertex S.r.l.
Inventors:
G. Carlo Ribolla, Federico Taroni, Domenico Peiretti, Antonio Pepino
Abstract: The apparatus detects corduroy cutter needles coming out of the weft yarn loop channels which are being cut open by the needles, by means of a laser beam scanning about 10 to 20 times a second, transversely across the region where the parallel needles are working. The scanning laser beam creates a diffused light pattern having the general form of a transversely oriented geometric prism, e.g. a cylinder; and a plurality of detector devices determines any variation in the light distribution, as to time and lateral distance, in this scattered or diffused ight pattern. A logic circuit carries out and displays the results of the scanning and detecting, and stops the corduroy cutting machine when an emerged needle is detected.
Type:
Grant
Filed:
December 19, 1984
Date of Patent:
October 27, 1987
Assignee:
Leglertex s.r.l.
Inventors:
G. Carlo Ribolla, Federico Taroni, Domenico Peiretti, Antonio Pepino