Sharp AR-PN4 (serv.man2) Service Manual ▷ View online
3-31
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
V.
FOLDING/DELIVERY SYSTEM
1.
Outline
The paper folding mechanism consists of a guide plate, paper folding rollers, paper pushing
plate, and paper positioning plate.
The guide plate is used to cover the folding rollers while sheets are output so as to prevent
sheets from coming into contact with the folding rollers during output. Before the stack is folded,
the guide plate moves down to enable the folding rollers to operate.
the guide plate moves down to enable the folding rollers to operate.
The folding rollers are driven by the paper folding motor (M2S), and the drive of the motor is
monitored by the paper folding motor clock sensor (PI4S). The mechanism is also equipped with a
paper folding home position sensor (PI21S) for detecting the position of the paper folding rollers.
paper folding home position sensor (PI21S) for detecting the position of the paper folding rollers.
The paper pushing plate is driven by the paper pushing plate motor (M8S), and the drive of the
paper pushing plate motor is monitored by the paper pushing plate motor clock sensor (PI1S). The
paper pushing plate home position sensor (PI14S) and the paper pushing plate top position sensor
(PI15S) are used to detect the position of the paper pushing plate.
paper pushing plate home position sensor (PI14S) and the paper pushing plate top position sensor
(PI15S) are used to detect the position of the paper pushing plate.
After being folded into two by the paper folding rollers, a stack is moved ahead by the delivery
roller for delivery. The delivery roller is driven by the paper folding motor. The delivery sensor
(PI11S) is mounted to the delivery assembly to detect delivery of paper. The tray paper sensor
(PI6S) is used to detect the presence/absence of paper on the tray, but does not detect jams. The
vertical path paper sensor (PI17S) serves to detect the presence of paper after jam removal.
(PI11S) is mounted to the delivery assembly to detect delivery of paper. The tray paper sensor
(PI6S) is used to detect the presence/absence of paper on the tray, but does not detect jams. The
vertical path paper sensor (PI17S) serves to detect the presence of paper after jam removal.
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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).
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).
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
remaining 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 peripheral 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
remaining 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 peripheral 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
