公开(公告)号：DE3071213D1

公开(公告)日：1985-12-05

申请号：DE3071213

申请日：1980-11-20

Applicant: IBM

Inventor： PROMIS GEORGE GIBSON ,  SMITH GERALD LEE ,  WILSON JOHN CHARLES

IPC: G05B1/03 ,  G03B27/34 ,  G03B27/50 ,  G03G15/04 ,  G03G21/14 ,  H02P5/50 ,  G05B19/39 ,  G05B19/403 ,  G05D13/62

Abstract: A servosystem for use, for example, in a scanning copying machine, comprises a motor (70a) within a closed loop also including a tachometer (23), sign and count logic (405), UP/DOWN counter (406), digital-to-analog converter (407), filter (408) and power amplifier (410). A counter (403) is employed to determine the velocity of motor (70a) by applying timed pulses to logic (405). The counter receives a sequence of integers from a table in microprocessor (100) through latches (404). When a particular integer is placed in the counter, it counts down in response to clock pulses from clock (401) until it generates a borrow pulse, which is the pulse applied to logic (405). At this time latches (404) are activated either to apply the same or a new integer into the counter. Thus the timing of the borrow pulses and, therefore the velocity of the motor, is determined by the values of a sequence of integers applied from the microprocessor.