Ricoh SP 8400DN Field Service Manual page 1947

A compact layout is achieved by sharing the edge binding stapler, booklet tray, transport, and stack.
The stapler unit and the folding process unit are divided.
Booklet stitch bundle transport and pressure release
In the case of booklet stitching, the paper must be transported to the stapling position.
Booklet transport rollers are provided at two positions, upper and lower. The transport and timing
of the rollers which transport the bundle differ according to the paper size.
A3, DLT, 12"×17.7"
After booklet stitching is complete, the (upper) booklet transport pressure release motor operates,
and at the same time, the (lower) booklet transport roller starts applying pressure.
B4 or smaller
The (lower) booklet transport roller starts to pressurize after a certain amount of paper (as much as
the leading edge goes through the nip of the (lower) booklet transport roller) for each size is
transferred after booklet stitching is done.
The booklet transport rollers transport the paper and apply pressure.
They transport the paper to the stapling position, and thence to the folding unit.
Transport and pressure/release are driven by upper and lower motors.
Upper: Booklet transport (upper) pressure release motor [A] (also performs trailing edge fence
retreat)
Lower: Booklet transport (lower) pressure release motor [B]
Booklet Finisher SR3220 / Finisher SR3210 (D3B9/D3B8)
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