PRINTER ESCAPEMENT SERVOMOTOR DRIVE WITH A MINIMUM POWER SUPPLY

摘要

A PRINTER ESCAPEMENT SERVOMOTOR DRIVE WITHA MINIMUM POWER SUPPLYAbstractA servomotor drive system for a printer escape-ment is provided which minimizes power supply require-ments. The drive system has means for acceleratingand decelerating the printhead escapement having afixed current source applied to a servomotor whichdrives the escapement. In order to minimize powerrequirements, the system includes means for control-ling the current in the motor which comprise means forsensing the actual motor current and feeding back thesensed current to a comparing means. A preselectedvarying current profile is applied to the comparingmeans which compares this profile to the actual motorcurrent. Means are then provided responsive to thesecomparing means for altering the actual motor currentto conform with this preselected varying motor currentprofile.