Apparatus and methods for checking the presence of yarns on a textile machine
AssigneeZellweger Luwa AG
InventorWalter Krebs
Life of this patent
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Abstract
The presence of yarns of a tentered yarn layer on a textile machine is checked by traversing a feeler transversely across a row of the threads to deflect the yarns. A pressure sensor of the feeler deflects each deflected yarn and generates a signal in response thereto. An optical sensor of the feeler detects each yarn and generates a second signal in response thereto which is compared to the first signal.
Claims18
Apparatus for checking the presence of yarns of a tentered yarn layer on a textile machine, comprising a frame, a feeler mounted to said frame for movement relative thereto, and an actuator for moving the feeler relative to a row of the yarns in a direction transversely of a direction of yarn travel and including yarn deflecting means for temporarily deflecting each yarn such that loads are applied to said deflecting means as said deflecting means encounters respective yarns, and sensing means for sensing the loads to provide a signal indicating a presence-related status of the yarns.
A method of checking the presence of a predetermined number of yarns of a tentered yarn layer on a textile machine, comprising the steps of:
- traversing a feeler transversely of a direction of yarn travel to deflect all yarns currently disposed in said yarn layer;
- causing a pressure sensor of said feeler to contact each deflected yarn and generate a first signal in response thereto, whereby a plurality of first signals are generated corresponding to respective ones of said deflected yarns;
- causing a second sensor of said feeler to detect all yarns currently disposed in said yarn layer and generate a second signal in response thereto whereby a plurality of second signals are generated corresponding to respective ones of said detected yarns;
- and
- comparing the number of each of said first and second signals generated to a reference value, said reference value corresponding to said predetermined number of yarns.
Dependencies are inferred from the claim text.