Ricoh B234 Service Manual page 1277

DETAILS
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B836D914.BMP
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The bottom fence [1] raises the stack to the prescribed fold position [2].
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The fold plate [3] moves to the left and advances 1/3 its maximum horizontal stroke
and exerts 20 kg (44 lb.) of pressure at the fold rollers [4].
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With the fold plate pushing the stack into nip of the fold rollers [5], the fold rollers
begin to rotate and fold the stack as it feeds out.
B836 38 SM