Electronic printer with single tracing element

Details Electronic printer with single tracing element Electronic printer with single tracing element

1981-09-02

1983-03-29

Griffin, Donald A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346139R, G01D 900, G01D 1524

Patent

active

043785638

ABSTRACT:
The printer comprises a ROM recorded for each character with a set of pairs of numerical instructions, of which one represents the direction of a constant velocity vector of the tracing element for tracing a segment of the character, and the other represents the duration for which that velocity has to be applied to said element. The direction instruction is decoded by a decoder in order to generate two orthogonal components which control two servo-mechanism by way of two corresponding D/A converters. The duration of the movement is controlled by a counter loaded by the duration instruction and decremented by a clock signal. Every time the counter is emptied a logic unit responds by addressing the next byte in the ROM.

REFERENCES:
patent: 3886308 (1975-05-01), Costello et al.
patent: 4348697 (1982-09-01), Takahashi et al.

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