(under subclass 419) Subject matter wherein the elongated material moves along a desired path subject to a degree of gravitational or similar sag proportional to the stress in the material, and the tension control system includes means to apply a retarding force against the running material in response to a detector actuated in response to deviation of the material from the desired path.
SEE OR SEARCH THIS CLASS, SUBCLASS:
413.3+, for a slack sensor used in regulating a take-up coil drive.
418.1, for a slack sensor used in regulating the drag developed by a feeder.
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.