Control for enabling flight timing of hammers during printing

Details Control for enabling flight timing of hammers during printing Control for enabling flight timing of hammers during printing

1987-08-12

1989-04-18

Wiecking, David A.

Printing

Selective or progressive

Bed and platen machines

400146, 364519, B41J 120

Patent

active

048216399

ABSTRACT:
A printer control apparatus provides a control circuit arrangement which enables flight timing to be performed during printing. Basically, the invention achieves this by providing flight time control means activated by a print hammer operation signal. Preferably the control temporarily inhibits the continuation of print hammer operation. Preferably the control inhibits print hammer operation subsequent to a selected print hammer by inhibiting the comparisons of print line and type element data contained in storage devices of the print control. Inhibiting may be for a fixed interval based on an average of the flight times of all the hammers. Alternatively the inhibiting interval may be varied according to the individual flight times of the hammers. In order to avoid slowing the print speed excessively, only one hammer is timed during printing of one line.

REFERENCES:
patent: 3872788 (1975-03-01), Palumbo
patent: 4278021 (1981-07-01), Nakano et al.
patent: 4317412 (1982-03-01), Bolcavage
patent: 4440079 (1984-04-01), Dayger et al.
"Flight Time System for a High Speed Printer"; J. S. Gregor et al.; IBM Technical Disclosure Bulletin; vol. 27, No. 4B, pp. 2318-2319; Sep. 1984.

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