Drive system for energizing elements of a fixed bar printer

Details Drive system for energizing elements of a fixed bar printer Drive system for energizing elements of a fixed bar printer

1982-12-27

1984-07-10

Envall, Jr., Roy N.

Electric heating

Heating devices

Combined with diverse-type art device

346 76PH, H05B 102, B41J 320, G01D 1510

Patent

active

044594623

ABSTRACT:
A drive system for energizing the elements of a fixed bar printer of the type in which a pair of parallel bars, of, for example, resistive material, have a series of first connections to individual bars interspersed by second connections to both bars. By driving a second connection, any one of four elements can be energized by selecting one of the adjacent first connections as a voltage source path. The drive lines which return current are fed by a driver/shift register system having a stage for each drive line. Data is fed to the driver/shift register system serially from a plurality of memories, each of which has a capacity equal to that of the driver/shift register system. The memories are grouped in fours, so that each memory stores data for energizing one of the print bar elements in each group of four defined by a drive connection and its adjacent current return connections. An addressing system controls the sequence of loading and unloading the memories. This sequence differs in accordance with whether non coded, i.e. line, data or coded, i.e. binary coded character, data is received.

REFERENCES:
patent: 4091391 (1978-05-01), Kozima
patent: 4099046 (1978-07-01), Boynton et al.
patent: 4128345 (1978-12-01), Brady
patent: 4287521 (1981-09-01), Hakoyama
patent: 4377972 (1983-03-01), O'Neil
patent: 4394092 (1983-07-01), Osmera

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