CHARACTER SPACING CIRCUIT FOR CONTROLLING PRINT HAMMER FIRING

摘要

CHARACTER SPACING CIRCUIT FOR CONTROLLING PRINT HAMMER FIRING A circuit for controlling the firing of a print hammer so as to maintain constant inter-charac-ter spacing during printing. The speed of a motor which moves a document in printing relationship with a printer is used to ascertain the instantaneous velocity of the document just prior to the firing of a hammer associated with the printer. An up/down counter is used in determining the delay, if any, in firing the hammer to compensate for instantaneous velocities which are slower than the fastest velocity of document travel expected.