Automatic roll or cut sheet sensing in plotters

Details Automatic roll or cut sheet sensing in plotters Automatic roll or cut sheet sensing in plotters

1993-09-20

1995-04-04

Sikes, William L.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250560, 250548, G01N 2186, G01V 904

Patent

active

054040221

ABSTRACT:
Apparatus for automatically determining if roll or cut-sheet media is being used in a plotter or similar device and for automatically setting some of the operating parameters in lieu of manual input by an operator. The roll media has a hole therein adjacent the roll end. An optical sensing pair senses the passage of light through the media at a point passed by the hole. If a suspected end is found, the media is moved a distance greater than the hole diameter. If light is still detected, the edge of a cut sheet has been detected. If light is no longer detected, it was a hole and the end of a roll of media has been detected. By being able to determine the type of media involved, the plotter logic can measure the width of the media and then get a desired length from a look-up table and thereafter determine if there is a proper length of media available for the plot.

REFERENCES:
patent: 5006719 (1991-04-01), Blaser
IBM Technical Disclosure Bulletin vol. 18 #2 Jul. '75.

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