Browse Prior Art Database

Original Publication Date: 1984-Dec-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


It is desired to speed up the document recirculation rate of a recirculating document handler so as to equal the copying rate of a higher speed copier without increasing actual document transport velocities in the recirculating document handler. This is provided by an improved algorithm for individualized operation of each RDH. The actual document acquisition time of the document separator- /feeder is measured by the copier controller for that particular document handler, i.e., by measuring the elapsed time between the activation time of the feeder and the activation time of the first sensor downstream of the feeder. Likewise, the actual transport time (between the sensors) from the initial acquisition of a document to its positioning on the platen is measured for that same RDH. This information is then used to provide a specific maximum or total time to be allowed by the control system of that copier for each document exchange (called the feed-to-flash time). This is in lieu of the standard practice of presetting a much longer fixed allowed time for all document exchanges, which fixed time was calculated for the worst conditions for any of such RDHs being manufactured. Yet this adaptive timing avoids the need for precise synchronization and the possibility of skipped copying cycles of the copier if the synchronization fails.