Canon J1, Service Manual

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Technology > Saddle Stitcher Unit > Overview of Folding Operation > Folding a Stack
Technology > Saddle Stitcher Unit > Overview of Folding Operation > Folding a Stack
■ Folding a Stack
A stack is folded by the action of the paper folding rollers and the paper pushing plate.
The paper pushing plate pushes against the center of a stack toward the roller contact
section.
The paper pushing plate starts at its home position and waits at the leading edge position
until the stack has been drawn to the paper folding roller and is gripped for a length of 10 mm.
When the paper folding roller has gripped the stack for a length of about 10 mm, the paper
pushing plate motor starts to rotate once again, and the paper pushing plate returns to its
home position.
The stack gripped in this way by the paper folding roller is drawn further by the paper folding
roller and then is moved by the delivery roller to the paper tray.
The thickness of the paper folding rollers is reduced at a half of their periphery except the
center area.
At the other 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. Also, these rollers stop at this position.
At the half periphery where the thickness is reduced, the paper folding roller (upper) and the
paper folding roller (lower) do not contact each other except at the center, so they only feed
paper to prevent paper from being wrinkled.
The paper folding start position and stop position of the paper folding rollers are controlled by
the number of motor pulses delivered from the paper folding home position sensor (P121).
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
M2
M8
Stack of sheets
Portion which the
thickness is reduced
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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
● Paper folding start position
Paper folding/feeding is performed.
Paper feeding is performed.
Paper folding home
position sensor (PI21)
Sensor flag
Delivery outlet
Paper feed inlet
Paper pushing plate
Stack of sheets
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