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This article describes a mechanism that will provide both a high and low nip pressure between the idler and thrust rollers in a paper feed device, with the thrust rollers rotating at a constant speed.
English (United States)
This text was extracted from a PDF file.
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100% of the total text.
Page 1 of 2
Variable Normal Force for Thrust and Idler Rollers
This article describes a mechanism that will provide both a high and low nip
pressure between the idler and thrust rollers in a paper feed device, with the
thrust rollers rotating at a constant speed.
Fig. 1 shows wrap-down spring 1 positioned on gate shaft 2 with tension arm
just in contact with idler roller shaft 3 and gate 4 in closed position. Nip pressure
in this position is minimum with no spring tension in the wrap-down spring; only
the weight of the idler roller shaft floating in the guide slots applies pressure.
This pressure is sufficient to align the copy sheet at gate 4 but light enough to
then permit slippage of thrust rollers 5 until gate 4 opens.
Concurrently with gate 4 opening (Fig. 2) by cam action, pressure is applied
to idler roller shaft 3 by wrap-down spring tension, causing nip pressure to
increase feeding the copy sheet from paper guide 8 on to the surface of the drum
at constant velocity and without skew.
Page 2 of 2
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