AUTOMATIC MECHANICAL RESONANT FREQUENCY DETECTOR AND DRIVER FOR SUTTLE PRINTER MECHANISM

摘要

Several printing elements are mounted on a head which ocillates on leaf springs. The ocillation of the head is maintained by a linear motor which drives the heat at its mechanical resonance frequency. The mecanical resonance frequency of the printer head is apt to alter during use and the control circuit alters the drive frequency to coincide with the resonance frequency. A linear speed sensor monitors the motion of the printing head and is connected directly to a phase comparator and via a resistor and an amplifier to the phase comparator. This has a feed back connection to the amplifier.