(under subclass 418) Subject matter wherein the material is adapted to be advanced along a path by the feeder at a rate to establish a desired level of material tension that is reflected by a degree of gravitational or similar sag of an unsupported portion of the material, and the tension control system includes a detector actuated in response to deviation of the material from an acceptable degree of sag to adjust the rate of advancement by the feeder to thereby reestablish the desired tension.
SEE OR SEARCH THIS CLASS, SUBCLASS:
413.3+, for a slack sensor used in regulating a take-up coil drive.
419.1, for a slack sensor used in regulating the drag developed by a guide.
420.3, for a slack sensor used in regulating a peripheral drive for a supply roll.
420.6, for a slack sensor used in regulating an electrical control circuit of a supply coil drive.
421.5+, for a slack sensor used in regulating a supply coil brake.
