End-of-ribbon sensor device

Details End-of-ribbon sensor device End-of-ribbon sensor device

1977-03-30

1978-09-19

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Means auxiliary to ribbon mechanism

400208, B41J 3536

Patent

active

041150139

ABSTRACT:
An end-of-ribbon sensor for use with an electronic typing system comprises a housing which protrudes from a mounting block and plate attached to the ribbon cartridge mounting plate. The housing protrudes through an aperture in the ribbon cartridge and within the interior volume thereof and contains a light source for directing a beam of light at a predetermined angle at the ribbon and a light detector directed at a predetermined angle for receiving the reflected light. Upon sensing a reflective marker attached to the ribbon, the output of the sensor provides an appropriate signal indicating the end-of-ribbon. The housing also comprises a portion of the mounting means for the ribbon cartridge.

REFERENCES:
patent: 2174351 (1939-09-01), Neidich
patent: 3513957 (1970-05-01), Ricciardi et al.
patent: 3604549 (1971-09-01), Caudill et al.
patent: 3632052 (1972-01-01), Read
patent: 3974906 (1976-08-01), Lee et al.
patent: 4010839 (1977-03-01), Guerrini et al.
patent: 4020940 (1977-05-01), Daley et al.
patent: 4037535 (1977-07-01), Lehmann et al.
IBM Technical Disclosure Bulletin, "Ribbon Usage Indicator," Caudill, vol. 8, No. 8, Jan. 1966, pp. 1137-1138.
IBM Technical Disclosure Bulletin, "End of Ribbon Sensor," Greer et al., vol. 13, No. 11, Apr. 1971, p. 3538.

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