Print hammer firing compensation circuit for printer velocity va

Details Print hammer firing compensation circuit for printer velocity va Print hammer firing compensation circuit for printer velocity va

1983-06-13

1985-07-09

Pieprz, William

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including endless-band carrier for type-faces

101111, 400322, B41J 120

Patent

active

045279209

ABSTRACT:
Circuit for detecting variations in the nominal velocity of a character band and adjusting the hammer firing times to compensate for the variations. This circuit measures deviations in band velocity that are either faster or slower than a nominal velocity during each character emitter pulse and makes an appropriate correction in the subscan times that gate the hammer firing signals. A bidirectional counter is counted up at a high frequency to a value representing the emitter period including the velocity deviation and then counted down after the error determination at a selected frequency that is a preselected fraction of the high frequency. This technique corrects for each character emitter pulse and incorporates a timing proportionality to assure correct hammer impact.

REFERENCES:
patent: 3656426 (1972-04-01), Potter
patent: 3752069 (1973-08-01), Stiles
patent: 3872788 (1975-03-01), Palombo
patent: 3880075 (1975-04-01), Bovett et al.
patent: 4275653 (1981-06-01), Balcavage et al.
Meier, "Digital Correction . . . " IBM Technical Disclosure Bulletin, vol. 14, No. 12, pp. 3565-3566, 5/72.
Hryck et al., "Type Belt . . . System" IBM Technical Disclosure Bulletin, vol. 22, No. 8A, pp. 3169-3170, 1/80.

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