B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
354/236.12
B41J 9/38 (2006.01) B41J 9/52 (2006.01)
Patent
CA 1056310
ABSTRACT OF THE DISCLOSURE An improved line printer is provided which employs successive time periods for effecting printing. During one such period, a signal compare phase, input character data is compared with the location of moving type fingers (carried on an endless belt moving past the various column locations on a record medium) and the column location at which the various input characters are to be printed to produce a hammer firing signal. The hammer firing signals are applied to the gates of respective hammer drive SCR's to cause their anode-cathode circuits to conduct a small current and precondition these SCR's to be operated during the following drive phase. During the drive phase, drive voltage is applied to all hammer drive scr anode-cathode circuits simultaneously, and those SCR's which have been conducting previously cause the energization of the corresponding hammer solenoids. This results in the actuation of a type finger to impact on the record medium and produce a recorded character. During the third or commutation phase, the SCR drive voltage is removed and a negative voltage is applied sufficient to cut off all SCR's and reset them. Thus, any desired subsequent firing depends upon further comparisons of input character data, type finger location and column information. To protect the hammer drive solenoids against overload, a separate, single pilot SCR is provided for causing the printer to be shut down in the event that no firing signals are being produced when power is applied to the drive bus for energizing the hammer solenoids.
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