Typewriting machines – Carriage or carriage-moving or movement-regulating mechanism – For varying carriage feed
Patent
1979-04-16
1981-07-14
Sewell, Paul T.
Typewriting machines
Carriage or carriage-moving or movement-regulating mechanism
For varying carriage feed
400 3, 400121, B41J 1932
Patent
active
042783593
ABSTRACT:
A control circuit for use in conjunction with dot matrix printers which includes a command word gate which is connected to a data source to receive data signals, the command word gate generating a control circuit enabling signal in response to reception of a predetermined coded command word signal from the data source. A density latch gate is connected to the data source to receive density code signals and to the command word gate and generates a density code output signal in response to reception of the command word signal and density code signals received from the data source. Connected to the density latch gate is a printer signal generating circuit with produces an output signal having a frequency proportional to the density code signal. This signal is applied to a dot matrix printer to vary the ratio of the lateral velocity of the printing head of a printer and the printing frequency of the printing hammers thereof to thereby selectively alter the horizontal dimension of alphanumeric characters produced by the printer.
REFERENCES:
patent: 4050563 (1977-09-01), Menhennett
patent: 4169684 (1979-10-01), Blom
patent: 4213714 (1980-07-01), Jones et al.
Sewell Paul T.
Weikel Associates, Inc.
Welch Ronald D.
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