SLIP CLUTCH SERVO SYSTEM
Original Publication Date: 1985-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
An alternative to a servo-driven optical scan system for a photocopier is shown in the figure. Input pulley 12 at the start of a scan cycle is driven in the indicated direction by a belt 13 being driven by main drive motor (not shown). The motion of pulley 12 is transmitted to output pulley I4 via slip clutch 16. Pulley 12 is driven faster than pulley 14 so there is always a degree of slip through the clutch. Belt 18 drives capstan pulley 20 which, in turn, drives optics drive shaft 22. Affixed to the outboard end of shaft 22 is a drum pulley 24 adapted to turn with shaft 22. Pulley 24 drives the optical scanning carriage via a cabIe/pulley arrangement (not shown). Torsion return spring 26 has one end locked to shaft 22 and the other end secured on the particular machine frame. This spring provides the force to accelerate the scan carriage in a negative (rescan) direction to enable both the capability of tracking driving scan oscillation and for the purpose of rescan. The mechanical drive arrangement is controlled by a feedback circuit consisting of encoder 30, controller circuit 32 and drum 34.