Optical sensing of wire matrix printers

Details Optical sensing of wire matrix printers Optical sensing of wire matrix printers

1980-09-25

1982-07-13

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400 74, 400711, B41J 310

Patent

active

043392083

ABSTRACT:
An optical sensor is provided for each print wire of a print head and includes two glass fibers to carry light from a light-emitting diode to the surface of a record medium and to carry the reflected light to a photodiode. Each printed dot is detected and the sensor output is compared with a delayed or stored print signal which is applied to the drivers for the print wires.

REFERENCES:
patent: 3714447 (1973-01-01), Jallais
IBM Tech. Disc. Bulletin, Dattilo et al., vol. 20, No. 4, Sep., 1977, p. 1299, 400-83.
IBM Tech. Disc. Bulletin, Poe, vol. 12, No. 7, Dec., 1969, p. 957, 400-74.
IBM Tech. Disc. Bulletin, Sokolski, vol. 8, No. 6, Nov., 1965, pp. 879-880, 235-473.

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