Method and apparatus for monitoring print head carriage

Details Method and apparatus for monitoring print head carriage Method and apparatus for monitoring print head carriage

1991-01-17

1992-02-25

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

400322, 4007053, 340686, B41J 2942, B41J 2938

Patent

active

050908294

ABSTRACT:
A print head carriage of an impact printer is monitored by means of a segmented timing member which is separate from but coupled to and movable in coordination with the carriage. The segmented timing member is associated with a carriage drive motor and preferably comprises a toothed wheel which is rotated by a motor drive gear also used to move the print head carriage. The teeth of the toothed wheel are monitored by an optical sensor with a resulting series of pulses being accumulated to define the rotation of the toothed wheel and thereby the movement and position of the print head carriage. A home carriage position is directly indicated via a carriage position indicating member which is operated by the print head carriage to interrupt the optical sensor of the preferred embodiment.

REFERENCES:
patent: 3970183 (1976-07-01), Robinson
patent: 4072893 (1978-02-01), Huwyler
patent: 4305674 (1981-12-01), Velazquez
patent: 4348625 (1982-09-01), Sharp
patent: 4461587 (1984-07-01), Schottle
patent: 4518272 (1985-05-01), George
patent: 4687361 (1987-08-01), Kikuchi
patent: 4898487 (1990-02-01), Brull
IBM Tech. Disclosure Bulletin, vol. 26, No. 7A, Dec., 1983, "Adaptive Braking Routine . . . ".
IBM Tech. Disclosure Bulletin, vol. 32, No. 1, Jun., 1989, "Print Head Calibration . . . ".

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