Compensator for Printhead Backlash
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02
Backlash or play between a printhead and its drive motor in a matrix printer can be compensated for during direction change by adding one or more dot column or slice counts to the original direction count before permitting recording during travel in the opposite direction. With a matrix printer, particularly one capable of bidirectional printing, there occurs both inadvertent and planned reversals of printhead direction. There exists some amount of mechanical play in the drive train from the motor to the printhead or print elements. This play directly results in misalignment between either the starting points of successive print lines for intentional direction changes or an offset over-printing in the case of unintentional temporary direction change of the head due to inadvertence, such as impact.