Servomotor drive system

Abstract

Herein disclosed is a drive system for a servomotor for use with the carriage of a serial printer, comprising a source of a variable command signal representative of the speed at which the servomotor is to operate, detecting means for detecting the output speed of the servomotor and producing a signal representative of the detected servomotor output speed, and first and second voltage sources respectively operative to supply predetermined voltages, the voltage from the first voltage source being higher than the voltage from the second voltage source. The drive system further comprises switching means responsive to the detected speed signal and operative to select the first voltage source when the detected speed signal is increased in voltage to a first threshold level and select the second voltage source when the detected speed signal is decreased in voltage to a second threshold level lower than the first threshold level, and drive means responsive to the command signal and operative to provide a path of current from the voltage source selected by the switching means to the servomotor.

Dependencies are inferred from the claim text.