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In a document transport system a rotating wheel or roller was required to yield a specific normal force to provide the necessary drive force to reliably skid a document across glass.
English (United States)
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Weighted Floating Bogie Wheel
In a document transport system a rotating wheel or roller was required to
yield a specific normal force to provide the necessary drive force to reliably skid a
document across glass.
A further requirement was that the force be even across the face of the
document and that the document be held relatively flat against the glass.
After determining the normal force required to balance between the
coefficients of friction between the glass and paper and between the paper and
belt, a floating bogie wheel was designed, as shown in the accompanying side
view. The combined weight of the wheel, shaft and bearings was designed to
yield the correct normal force by gravity.
The floating mount was designed to account for any variations, without
adjustment, in the dimension "B". These variations include dimensional
tolerances in the mounting hardware, document thickness, belt thickness, glass
flatness or bow, and any non-parallelism between the glass face and the
document feeder frame.
The assembly includes wheels or rollers 3 having axles or shafts 5 which
rotate in bearings 7. The bearings 7 are free to move vertically in the mounts 9,
and exert a normal force on the belt 11 and document 13 moving across the
surface of glass 15.
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