Method and apparatus for placing information on a medium while c

Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light

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Details

324177, 355317, 347129, 347250, G01D 1510

Patent

active

054482666

ABSTRACT:
Endless web or drum type laser printers have enhanced copy registration. Image frame length control has particular utility in a printing or reproduction apparatus that writes one or more images on a photosensitive media that is driven by a low cost synchronous hysteresis A.C. motor. The power line frequency is monitored and compared to a precision crystal clock. When the frequency is lower than specification and the motor slows down the number of scan lines are increased by repeating them to lengthen the image frame. When the power line frequency is higher than specification, the number of scan lines per image frame are decreased by deleting scan lines to shorten the image frame.

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