SINGLE REVOLUTION, ELECTROMAGNETIC FRICTION CLUTCH
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Referring to the drawing figures, in copying machine paper feeders of the type that employ a pair of segmented feed rolls 4 rather than the traditional full circum-ference feed roll or wheel, it is critical that the feed roll segments 5 return to a given rest or "home" position after each sheet feed cycle. Since a complete feed cycle requires a single revolution of the feed rolls 4, applications of this type have historically used a wrap-spring clutch to couple and uncouple the feed roll drive shaft 7 to the machine drive motor. However, the inherent unreliability of wrap-spring clutches, particularly where used in low speed, low inertia applications such as paper feeders, renders their use undesirable. Further, if it is desired to employ a stalled-sheet registration scheme, it is necessary that the drive shaft 7 be stopped momentarily at some point during the feed cycle.