Printer and receiver supply tray adapted to sense amount of rece

Details Printer and receiver supply tray adapted to sense amount of rece Printer and receiver supply tray adapted to sense amount of rece

1998-04-03

1999-12-14

Burr, Edgar

Typewriting machines

Means auxiliary to typewriting function

Indicator means

4007072, 400703, 27125501, B41J 2918

Patent

active

060008717

ABSTRACT:
A printer and receiver supply tray adapted to sense amount of receiver therein, and method thereof. The printer comprises a print head for printing an image on the receiver and a supply tray associated with the print head for holding a plurality of cut sheets of the receiver, the cut sheets defining a stack of sheets having a predetermined height. A sheet feeder engages the stack of sheets for sequentially feeding sheets from the tray and to the print head, such that height of the stack of sheets decreases as the sheets are fed therefrom. A platen is movably connected to the tray for continuously supporting the stack of sheets in the tray as height of the stack of sheets decreases. An indicator is connected to the platen and movable therewith for indicating height of the stack of sheets as the height of the stack of sheets decreases. The indicator has a surface area thereon of a predetermined light reflectance associated with the amount of sheets in the tray. A sensor is optically coupled to the indicator for sensing light reflected from the surface area thereof, the sensor being adapted to cast light on the surface area and sense the light reflected therefrom.

REFERENCES:
patent: 4928949 (1990-05-01), Ramsey et al.
patent: 4936681 (1990-06-01), Ruhrmann
patent: 5078379 (1992-01-01), Leisner
patent: 5096180 (1992-03-01), Nagaoka et al.
patent: 5102112 (1992-04-01), Takahashi
patent: 5311272 (1994-05-01), Daniels et al.
patent: 5347350 (1994-09-01), Nakahata et al.
patent: 5572630 (1996-11-01), Azuma et al.
patent: 5629672 (1997-05-01), Brown et al.

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