B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
197/39, 341/44
B41J 33/16 (2006.01) B41J 33/34 (2006.01) B41J 33/44 (2006.01) B65H 59/38 (2006.01)
Patent
CA 1116724
ABSTRACT OF THE DISCLOSURE An impact printer ribbon drive of the reel-to-reel type in which a length of ink ribbon extending between and wound around opposite reels is disposed between a reciprocating hammer bank and print paper on a platen drives the ribbon at substantially constant speed and tension independent of varying ribbon pack on the two reels. Each one of the reels is driven by a different one of a pair of DC permanent magnet motors. The motors are ener- gized by a circuit which maintains the sum of the currents through the two motors substantially constant and which also maintains the voltage at the leading or take-up motor substantially constant. The sum of the currents and the voltage are maintained substantially constant by a pair of servo circuits associated with different ones of the motors and coupled to be alternately actuated in response to external direction commands. Also included is cir- cuitry responsive to voltages in different parts of the circuit for signal- ling unwanted conditions such as a run-away ribbon, a jammed ribbon or a loose hub at one of the reels.
282457
Kleist Robert A.
Matula Jerry
Printronix Inc.
Smart & Biggar
LandOfFree
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