Method for detecting the length of sheet in a printer

Details Method for detecting the length of sheet in a printer Method for detecting the length of sheet in a printer

1991-12-02

1992-12-22

Burr, Edgar S.

Typewriting machines

Means auxiliary to typewriting function

Indicator means

400279, 400320, 400596, 400706, B41J 2920, B41J 2944

Patent

active

051729911

ABSTRACT:
In the determination of the length of a sheet that has been inserted in a printer, an optical sensor scans the length of the sheet as it is fed into the printer, and a counter is controlled to provide a count corresponding to the length of the sheet. When the sensor encounters a mark on the sheet, such as a line, it provides an output indicating that the sheet is not present. This erroneous output is corrected by moving the sensor laterally of the sheet to a position displaced from the mark to enable further sensing of the presence of the sheet in a region that does not include the mark.

REFERENCES:
patent: 4265556 (1981-05-01), Krieg et al.
patent: 4272204 (1981-06-01), Quinn et al.

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