Print head locating utilizing sonic techniques

Details Print head locating utilizing sonic techniques Print head locating utilizing sonic techniques

1978-11-30

1980-06-17

Crowder, Clifford D.

Typewriting machines

Carriage or carriage-moving or movement-regulating mechanism

Carriage-feed mechanism

400322, 400328, B41J 1900

Patent

active

042081424

ABSTRACT:
In a printer having a print head assemblage longitudinally moving along a path parallel to a record medium, a portion of the print head assemblage is controlled to strike the record medium at a desired point by measuring the time required for sonic pulses generated in a rod at the position of the print head assemblage to arrive at a sensor, such time being a function of the distance from the print head assemblage to the sensor. A representation of this time is compared against a similar representation of a time associated with the position of the desired point and upon equality the portion of the print head assemblage is driven toward the record medium.

REFERENCES:
patent: 3892303 (1975-07-01), Willcox
patent: 3898555 (1975-08-01), Tellerman
patent: 4044881 (1977-08-01), Chai et al.
patent: 4058195 (1977-11-01), Fravel et al.

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