SHARED SERVO DRIVE SYSTEM
Original Publication Date: 1984-Feb-29
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
A controlled servo-motor drive for both the recirculating document handler and the platen scanning lamp/mirror optics elements of a copier is desirable. This may be done with a single, shared servo-motor. The servo will control and drive the platen scanning lamp and mirrors in one pre-programmed manner through a first clutch coupling. Then by actuating a second clutch coupling and shifting to a different software program the same servo motor can drive the recirculating document handler to provide the document exchange on the same platen of the same copier, between said optics scans. This system may drive the entire RDH, or drive only the platen transport portion (e.g. the over-platen document feed wheels or belt) of the RDH. It may be used in an RDH or SADH (semi-automatic document handling of individual documents) mode of operation where the document handler is a dual mode (RDH/SADH) unit such as that disclosed in U.S. Patent 4,176,945 to R. Holzhauser et al. A further aspect would be to use the same servo for the RDH's SADH drive (or a separate SADH) to provide a continuous reduction moving document (resettable constant velocity) copying mode (i.e., providing a continuous range of constant document transport speeds over stationary optics corresponding to a continuous range of image reductions). The amplifier for the servo motor may also be shared between the document drive and the platen scanning optics drive, as in U.K. Patents 1,604,762 and 1,604,763 issued December 16, 1981.