B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
101/92
B41F 1/18 (2006.01) G06K 15/08 (2006.01)
Patent
CA 1179889
HOME PULSE COMPENSATION FOR MULTIPLE SPEED LINE PRINTER ABSTRACT OF THE DISCLOSURE The control system for a line printer includes compensation circuit means for electronically changing the timing of the reference or home pulse to compensate for changes in the speed of the type characters on a continuous type carrier. The compensation circuit includes a storage register, a counter and a comparison circuit for comparing the content of the storage register and the counter. The counter when activated by a reference pulse generated from a reference mark on the moving type carrier counts subscan pulses generated from timing marks moving with the type characters. The storage register, which is programmable, stores different numeric values dependent on the speed of the type carrier representing different numbers of subscan pulses to be counted by the counter means. The comparator circuit compares the numeric value in the register with the count registered in the counting means. When an equality is detected, the comparator circuit generates a modified reference or sync pulse which is applied to sync control circuitry which checks the character signal produced by the type position circuitry of the printer controls. EN981003
425350
Carrington James E.
Hryck Michael D.
Skinner Dean W.
Westcott Gerald R.
International Business Machines Corporation
Kerr Alexander
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