B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
101/96.011
B41J 9/52 (2006.01)
Patent
CA 1145612
Abstract of the Disclosure In a dot matrix line printer in which selected ones of a plurality of hammers mounted on a reciprocating hammer bank are released in response to successive sets of serial data to print dots on a paper, the changing hammer release characteristics which are caused by different numbers of hammers being released with each new set of serial data are compensated for by an arrange- ment providing a varying hammer release signal in accordance with the number of hammers being released. The variable release signal is provided in the form of a variation in the time interval during which the drive amplifiers associated with hammer release coils are turned on, thereby effectively varying the length of a current pulse provided to each coil in direct proportion to the number of hammers to be released. A counter is preset, then counted down from the preset value in accordance with the number of hammers to be released as represented by a set of serial data being provided to a shift register. When the shift register is loaded, latches associated with the various stages of the shift register containing hammer release signals are set so as to turn on associated ones of the drive amplifiers. The counter counts up in response to clock pulses until it overflows and clears the latches so as to turn off the drive amplifiers.
360076
Barrus Gordon B.
Matula Jerry
Printronix Inc.
Smart & Biggar
LandOfFree
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