Sharp AR-F15, Service Manual, Page: 130 / 280

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CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
4. Double Folding a Stack
To fold a stack consisting of 10 or more A4-R or LT-R sheets, folding is executed twice for the
same sheet.
The paper folding rollers rotate in reverse for an equivalent of 20 mm after gripping the stack
for a length of 20 mm, enabling the paper folding rollers to apply an increased degree of pressure
along the crease on the stack. Then, the paper folding rollers rotate normally, and the paper pushing
plate returns to its home position while the stack is being delivered.
This way, a stack requiring a large force may properly be folded with less pressure.
1) The paper pushing plate pushes the stack in the direction of the paper folding rollers.
M2S
Paper folding motor
M8S
Paper pushing plate motor
Paper pushing plate
Paper folding roller
Figure 3-507
2) The paper folding rollers grip the stack for a length of about 20 mm.
M2S
Paper folding motor
20 mm
(approx.)
Figure 3-508