Booklet maker fold the stack
The paper-pushing plate pushes the center of the stack to the roller-contact section and waits at the
leading-edge position until the stack is taken by the paper-folding roller. When the paper-folding roller
has gripped the stack, the paper-pushing-plate motor rotates, returning the paper-pushing plate to its
home position. The paper-folding roller draws the stack until the delivery roller moves it to the output
bin. The thickness of the paper-folding rollers is reduced at the upper half of the periphery but
maintained in the center area and at the lower half of the periphery. At the lower half of the periphery
where the thickness is not reduced, the paper-folding roller (upper) and the paper-folding roller
(lower) contact each other tightly, and paper starts to be folded at this position. The upper and lower
rollers feed paper while folding it and stop at the folding position. At the upper half of the periphery
where the thickness is reduced, the upper and lower paper-folding rollers do not contact each other
except at the center, so they only feed the paper to prevent paper from being wrinkled. The paper-
folding start and stop positions are controlled by the number of motor pulses delivered from the
paper-folding home-position sensor (P121).
Figure 1-153 Folding position (1 of 5)
Paper folding
roller (lower)
Paper folding roller (upper)
Sensor flag
Paper folding home
position sensor (PI21)
Paper pushing plate top
position sensor (PI15)
Paper pushing plate home
position sensor (PI14)
Paper pushing plate
Paper pushing
plate motor
Paper folding motor
Stack of sheets
M2
M8
Portion which the
thickness is reduced
Figure 1-154 Folding process (2 of 5)
Sensor flag
Paper folding home
position sensor (PI21)
Paper pushing plate top position
sensor (PI15)
Paper pushing plate home
position sensor (PI14)
Paper pushing plate
Paper pushing
plate motor
Paper folding motor
M2
M8
188 Chapter 1 Theory of operation ENWW
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