Printer escapement control system

Details Printer escapement control system Printer escapement control system

H - Electricity

02

P

101/96.0211

H02P 7/28 (2006.01) B41J 19/20 (2006.01)

Patent

CA 1138520

PRINTER ESCAPEMENT CONTROL SYSTEM Abstract of the Disclosure Disclosed is a digital escapement control system in which the motor (DC) control is completely digital requiring no tachometer generation of feed back signal nor any analog to digital convertors. Connected to the DC motor shaft is a code wheel and detector to determine the time between discreet positions of the motor shaft as it rotates. The time between discreet positions is then compared with a desired time, and the difference is stored, as by a register. The difference is then converted to a pulse-width-modulated (PWM) signal which directly controls the rotational velocity of the motor, increasing or decreasing it as necessary. The system operates, in a ramp, open loop start up mode and digital velocity controlled braking mode while in the motional mode with the feed back as described above. At start up, provision is made for inserting the feed back loop when the velocity reaches some predetermined level or percentage of the desired velocity. LE9-79-013

334109

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