초록 ▼

In the printer pin control circuitry described herein, data bits which request the actuation of respective pins are entered, indirectly, into respective digital equivalent shift registers to provide, for each pin, a respective short term history of actuation requests. A high speed, special purpose d

In the printer pin control circuitry described herein, data bits which request the actuation of respective pins are entered, indirectly, into respective digital equivalent shift registers to provide, for each pin, a respective short term history of actuation requests. A high speed, special purpose digital processor sequentially examines the several shift registers to determine, at successive points in time, whether each pin winding should then be energized or not to produce an effective energizing and damping waveform under a variety of sequential actuation conditions.

대표청구항 ▼

In a printer system employing a multiple pin print head in which pin firings are initiated by the generation of data words at a clock rate substantially faster than possible repetitive firings of a single pin, each such word comprising a plurality of data bits each corresponding to a respective pin,

In a printer system employing a multiple pin print head in which pin firings are initiated by the generation of data words at a clock rate substantially faster than possible repetitive firings of a single pin, each such word comprising a plurality of data bits each corresponding to a respective pin, the occurrence of a fire bit at any data bit position in the data word being a signal to initiate an operation of the respective pin; apparatus for effecting high speed actuation and damping of the pins in response to such data words, said apparatus comprising: for each pin, a high speed driver circuit; means for generating, for each pin, a firing signal which comprises a long pulse of predetermined duration, initiated by a respective fire bit, followed by a series of short pulses; means for applying each firing signal to the respective driver circuit; and means for reducing the number of short pulses in the series when a successive fire bit for the same pin is received in a predetermined interval following the long pulse, the extent of shortening being a predetermined progressive function of the actual timing of said successive fire bit.