HIGH-SPEED POWER ENCODE MODULE

摘要

Disclosed are power encoder means for imprinting MICR characters on checks, with optical check-sensing means disposed along a check-transport path, including optical skew-sensor means. Print drums are described wherein a special ''alignment character'' is placed, along with print-symbols, on the surface of the print drum, mixed-in with at least one of the character sets. Disclosed are impact printing arrangements with impact surface means, wherein impact-energy is graded and applied according to the die-surface area of a selected die-symbol. Disclosed are impact printing arrangements, with multi-column die-surface means and an associated plural print-hammer means, one for each column, wherein techniques are taught for monitoring hammer motion and coordinating simultaneous impact thereof on said surface means by detecting and analyzing hammer-activating inductor voltage. Disclosed are servo methods and apparatus whereby unit-record documents are transported past a process-station according to one, or several, ''velocity-profiles'', depending upon document type and/or condition. Disclosed are ''anti-wander'' web-transport arrangements wherein web-means are intermittently advanced, while being monitored for misalignment along the transport-path, and also being automatically urged back into proper alignment along this path.