Abstract: Modulation of the edge erase lamps in a copier/duplicator/printer to record visual data in the normally unused margins of a copy/duplicate/print. Numerical information can be recorded by a controlled switching sequence of the lamps normally used for edge erasing on electrophotostatic type copiers (or duplicators or printers). Turning off an edge erase lamp causes a dark streak near the margin on the copy in line with the lamp so switched off. By selectively turning off and on combinations of a plurality of edge erase lamps, visual data such as numerals can be written in the margins while copies (or duplicates or prints) are being produced.

Abstract: A document copier machine with an automatic document feeder (ADF) combined with a semiautomatic document feeder (SADF) is operated according to a job recovery procedure in which multiple originals may need recopying in order to replace copies destroyed when a jam occurs. The procedure calls for feeding the required number of originals needed for recopy through the SADF and once the jam recovery is complete, automatic restarting of the ADF occurs in order to complete the job interrupted by the jam.

Abstract: Copy sheets produced by varying copier machine subsystems for analyzing subsystems' performance. By varying parameters, sequencing the coronas, and inhibiting the various subsystems of a copy machine in certain orders, the resulting copy sheets can be analyzed for indications of the subsystems' efficiency. The order of operation reduces or eliminates the subsystems interacting effects so that the degradated operation of a particular subsystem can be perceived.