Sharp AR-CF1 (serv.man4) Service Manual ▷ View online
3-36
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.
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
3-37
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
3) The paper folding rollers rotate in reverse, pushing back the stack for a length of about 20 mm
(reverse feeding).
M2S
Paper folding motor
20 mm
(approx.)
Figure 3-509
4) The paper folding rollers rotate again, feeding out the stack. The paper pushing plate returns to its
home position.
M2S
Paper folding motor
M8S
Paper pushing plate motor
Figure 3-510
Paper folding motor (M2S)
Paper pushing plate
motor (M8S)
motor (M8S)
Delivery sensor (PI11S)
Paper pushing plate top
position sensor (PI15S)
position sensor (PI15S)
Paper pushing plate home
position sensor (PI14S)
position sensor (PI14S)
Tray paper sensor (PI6S)
Equivalent of 20 mm
Equivalent of 20 mm (reverse feeding)
Gripping of paper stack
: Motor CW
: Motor CCW
Paper folding home
position sensor (PI21S)
position sensor (PI21S)
Figure 3-511
3-38
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
VI. CHECKING FOR A JAM
1.
Checking for a Jam
The saddle stitch unit identifies any of the following conditions as a jam, and sends the jam signal
to the host machine. In response, the host machine may stop copying operation and indicate the
presence of a jam on its control panel.
presence of a jam on its control panel.
PI18S
PI8S
PI19S
PI20S
Figure 3-601
Table 3-601
No.
Sensor
PI8S
Paper positioning plate paper detection sensor
PI11S
Delivery sensor
PI14S
Paper pushing plate home position sensor
PI15S
Paper pushing plate top position sensor
PI17S
Vertical path paper sensor
PI18S
No.1 paper sensor
PI19S
No.2 paper sensor
PI20S
No.3 paper sensor
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CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
2.
Inlet Delay Jam
The No.1 paper sensor (PI18S) on the paper sensor PCB does not turn ON for a specific period
of time after the inlet sensor (PI1) of the finisher turned ON.
Inlet sensor (PI1)
Inlet sensor (PI1)
(PI18S)
(PI18S)
No.1 paper
sensor
sensor
No.1 paper
sensor
sensor
Feed motor
Feed motor
Delivery speed (mm/sec)
Delivery speed (mm/sec)
Jam
Load stops
Figure 3-602
3.
Inlet Stationary Jam
The No.1 paper sensor (PI18S), No.2 paper sensor (PI19S), and No.3 paper sensor (PI20S) on
the paper sensor PCB do not turn OFF when the stack has been fed for a specific period after the
No.1 paper sensor (PI18S) turns ON. The paper sensor used varies according to the paper size.
No.1 paper sensor (PI18S) turns ON. The paper sensor used varies according to the paper size.
a.
A3/LD Stack
(PI18S)
(PI18S)
No.1 paper sensor
No.1 paper sensor
Feed motor
Feed motor
Normal
Jam
Load stops
T: feeding of (paper length x 1.5) mm
T: feeding of (paper length x 1.5) mm
Figure 3-603
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