Print head motor control system with automatic drive parameter calculations

摘要

A print head motor control system for a printer having a bidirectionally movable print head employs a microcomputer to automatically calculate print head motor parameters which are utilized to generate a motor drive voltage value for any desired print head speed. Upon powering-up of the printer, the print head is driven until contact with the left sideframe is made. A full pass from left to right is then made checking for obstructions. The print head motor is driven at a first default drive voltage value, which is assumed to drive the print head at a first preselected velocity while the first actual print head velocity is measured. The printhead motor is then driven at a second default drive voltage value, which is assumed to drive the print head at a second preselected velocity while the second actual print head velocity is measured. The first default value, first actual print head velocity, second default value and second actual print head velocity are then used to derive a voltage vs. velocity constant and a frictional value which are used to calculate the appropriate drive voltage value for any given desired print head velocity.