Ricoh SP 8400DN Field Service Manual page 2192

2.Detailed Descriptions
Letter Fold-in / Letter Fold-out / Z-fold
[1] The leading edge of the paper passes the registration roller.
[2] The leading edge of the paper passes the 1st fold roller (F/R).
[3] When the paper is fed to the fold-assessment position, the 1st fold roller (F/R) reverses, forming an arch in the
paper.
[4] When this arched part passes through the nips of the folding rollers 1 and 2, the first fold is performed.
[5] After the paper passes the folding roller, the 2nd fold roller pulls in the paper and feeds it to the 2nd fold
position.
[6] At the fold position, the 2nd fold roller (F/R) rotates in reverse to form an arch in the paper.
[7] The 2nd fold is formed when this arched part is fed through the nips of the folding rollers 2 and 3. Depending
on the difference in the fold positions, Letter Fold-In, Letter Fold-Out, or Z-Fold is performed.
The following diagrams show a Letter Fold-In example.
Half Fold
[1] The leading edge of the paper passes the registration roller.
[2] The paper is fed to the folding rollers 1 and 2 by the junction gate [A].
[3] The leading edge of the paper passes the 2nd fold roller (F/R) and is fed to the fold position.
[4] At the fold position, the 2nd fold roller (F/R) rotates in reverse to form an arch in the paper.
[5] The 2nd fold is formed when this arched part is fed through the nips of the folding rollers 2 and 3.
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