公开(公告)号：CA1221933A

公开(公告)日：1987-05-19

申请号：CA458369

申请日：1984-07-06

Applicant: IBM

Inventor： BLOOM ROBERT D ,  BURKE EDWARD J ,  KOZOL EUGENE T

IPC: B41J11/42 ,  B41J11/44 ,  B41J19/76 ,  G05B19/23 ,  G06K15/00

Abstract: A positioning, system for a line printer uses dc servomotors for driving a forms feed mechanism in increments of one or more line spaces at a time. The system includes a microprocessor and a position counter that counts either 1/4 or 1 degree displacement pulses generated by a motion indicating means including optical transducers and an emitter disk coupled to the motors. The motion indicating means includes an error hold and compensation counter that counts and stores 1/4 degree pulse generated during error movement of the motors relative to a stop position during the uncontrolled state and supplies a corrected 1 degree pulse to the position counter upon start up.