Slaved ramp voltage generator for a calligraphic character print

Details Slaved ramp voltage generator for a calligraphic character print Slaved ramp voltage generator for a calligraphic character print

1981-03-11

1986-02-25

Sewell, Paul T.

Typewriting machines

For typing or forming continuous or discontinuous line

Including programmed-control-system

400 18, 400 19, 400322, B41J 304

Patent

active

045726795

ABSTRACT:
The slaved ramp voltage generator disclosed herein facilitates the writing of characters by a servo controlled stylus carried on a moving carriage. The carriage is driven at a selectable speed and the drive system generates pulse signals at a rate which is proportional to carriage speed. A digital counter is advanced by these pulse signals and the digital value held by the counter is converted to an analog voltage which varies in proportion to displacement of the carriage. This carriage displacement voltage is summed with a vector-defining position voltage to obtain a control voltage which drives the stylus servo mechanism to effect writing with respect to a moving frame of reference.

REFERENCES:
patent: 3950685 (1976-04-01), Kramer
patent: 4044881 (1977-08-01), Chai et al.
patent: 4150902 (1979-04-01), Brescia
patent: 4203678 (1980-05-01), Nordstrom

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