James Roy Signor

US Patent:

4838157, Jun 13, 1989

Filed:

Mar 25, 1988

Appl. No.:

7/173386

Inventors:

James Signor - Trumansburg NY

Assignee:

NCR Corporation - Dayton OH

International Classification:

B41J 792
B41J 938

US Classification:

101 9303

Abstract:

A digital printhead energy control system includes a first storage device for receiving hammer pulse duration data, a second storage device for receiving hammer pulse energization data and for producing a trigger signal and hammer pulse energization signals, a counter for counting to a value equal to the value stored in the first storage device, a comparator for comparing the value stored in the first storage device with the incrementing counter value, latch means for latching the output of the comparator to produce an end pulse signal, first gating means for combining the end pulse signal and a reset signal for controlling the clearing of the second storage device and terminating the hammer pulse energization signals, and second gating means for combining the trigger signal and a reset signal for controlling the clearing of the counter.