WRAP SPRING FRICTION DRIVE CLUTCH
Original Publication Date: 1983-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A wrap spring clutch is disclosed as having an input hub I, an output hub 2, and a wrap spring 3. A solenoid (not shown), when energized, actuates a ratchet collar 4 to extend one end of the spring 3 thereby effecting wrapping down of the coils of the spring on the friction face of the output hub 2, producing rotation thereof. A circular friction plate 6 is secured to one end of the output hub and rotates therewith. An output shaft 7 is connected to a circular friction plate 8 positioned in axial alignment with and spaced from the plate 6. Drive motion is imparted from the input plate 6 to the output plate 8 by a pair of Belleville springs 10 positioned between the plates 6, 8 and encircling the shaft 7. Upon energization of the solenoid to produce rotation of the plate 6, the Belleville springs act against the friction plates 6, 8 first by slipping and then transmitting motion to the output shaft.