Sharp AR-F12 (serv.man4) Service Manual ▷ View online
3-32
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
2.
Controlling the Movement of Stacks
When a stack has been stitched (2 points), the paper positioning plate lowers so that the stack will
move to where the paper folding rollers come into contact with the stack and where the paper pushing
plate is located. The position of the paper positioning plate is controlled in reference to the number of
motor pulses coming from the paper positioning home position sensor (PI7S).
plate is located. The position of the paper positioning plate is controlled in reference to the number of
motor pulses coming from the paper positioning home position sensor (PI7S).
At the same time as the paper positioning plate operates, the guide plate lowers so that folding
may take place.
(PI13S)
Stitching
ends
Equivalent of specific
number of pulses
number of pulses
Paper positioning plate
motor
motor
Guide motor
Guide home position
sensor
sensor
Figure 3-501
3-33
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
3.
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 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.
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.
Half of the peripheral area of the paper folding rollers excluding the center part is punched out.
This punched out area only feeds the paper as the paper feeding roller (lower) contacts the paper
feeding roller (upper) only at the center of the roller to prevent the paper from wrinkling. As the paper
feeding roller (lower) contacts the paper feeding roller (upper) at their entire surfaces on the remain-
ing half of the peripheral area, paper folding starts from this half of the peripheral area, and paper is
fed while it is being folded. The stop position of the paper folding rollers is in this half of the periph-
eral area.
feeding roller (upper) only at the center of the roller to prevent the paper from wrinkling. As the paper
feeding roller (lower) contacts the paper feeding roller (upper) at their entire surfaces on the remain-
ing half of the peripheral area, paper folding starts from this half of the peripheral area, and paper is
fed while it is being folded. The stop position of the paper folding rollers is in this half of the periph-
eral area.
The paper folding start and stop positions on the paper folding rollers is controlled according to
the motor clock signals from the paper folding home position sensor (PI21S).
Paper folding
roller (lower)
roller (lower)
Paper folding
roller (upper)
roller (upper)
Sensor flag
Paper folding home
position sensor
position sensor
(PI21S)
Paper pushing plate top
position sensor
position sensor
(PI15S)
Paper pushing plate home
position sensor
position sensor
(PI14S)
Paper pushing plate
Paper pushing plate motor
Paper folding motor
M2S
M8S
Stack of sheets
Figure 3-502
3-34
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
Sensor flag
Paper folding home
position sensor
position sensor
(PI21S)
Paper pushing plate top position sensor
(PI15S)
Paper pushing plate home
position sensor
position sensor
(PI14S)
Paper pushing plate
Paper pushing plate motor
Paper folding motor
M2S
M8S
Figure 3-503
[Paper folding start position]
Paper folding/feeding is performed.
Paper feeding is performed.
Paper folding home
position sensor (PI21S)
position sensor (PI21S)
Sensor flag
Delivery outlet
Paper feed inlet
Paper pushing plate
Stack of sheets
Figure 3-504
3-35
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
[Paper folding roller stop position]
Paper folding/feeding is performed.
Paper feeding is performed.
Paper folding home
position sensor
position sensor
(PI21S)
Sensor flag
Delivery outlet
Paper feed inlet
Figure 3-505
Paper folding motor
(M2S)
Paper pushing plate
motor
motor
(M8S)
Paper pushing plate home
position sensor
position sensor
(PI14S)
Paper pushing plate top
position sensor
position sensor
(PI15S)
Delivery sensor
(PI11S)
Tray paper sensor
(PI6S)
: Motor CW
: Motor CCW
Paper folding home
position sensor
position sensor
(PI21S)
Equivalent of 10mm by paper folding motor
Figure 3-506
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