Apparatus and method for measuring a dimension of an object

Details Apparatus and method for measuring a dimension of an object Apparatus and method for measuring a dimension of an object

1999-01-08

2000-12-26

Walsh, Donald P.

Sheet feeding or delivering

Feeding

Pack holders

27126501, 27126502, 356 407, 356383, 356384, 25055919, 25055924, B65H 100

Patent

active

061646393

ABSTRACT:
A method and apparatus for measuring a dimension of an object which utilizes a reflective photosensor and a facing reflective surface, wherein the spacing between the sensor and the reflective surface is varied depending on the dimension to be measured. The preferred application of the invention is in a sheet feeder for a printer wherein the invention provides an electrical signal indicative of the size of sheets in the sheet feeder. The electrical signal may be used to control a printing function. The sheet feeder (10) includes a base (14) having a paper guide (18) slideably mounted thereon. The guide (18) carries a tapered arm (26) which includes a reflective surface (28). A reflective photosensor (30) is fixedly mounted on the base opposite the reflective surface (28) such that the variable distance between the sensor (30) and the surface (28) as the paper guide (18) is adjusted gives a correspondingly variable electrical output from the sensor. When the sensor (30) is adjusted against the edge of a stack of sheets, the sensor's output represents a dimension of those sheets.

REFERENCES:
patent: 3813166 (1974-05-01), Mary
patent: 5573236 (1996-11-01), Petocchi et al.

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