Sharp AR-F12 (serv.man4) Service Manual ▷ View online
3-20
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
4.
A4-R/LT-R Paper Path (3 sheets)
SL1S
SL2S
ON
ON
No.1 paper sensor
PI18S
PI18S
PI19S
PI20S
No.2 paper sensor
No.3 paper sensor
Passage of paper
Passage of paper
Passage of paper
Entry of First sheet
PI18S
PI19S
PI20S
Entry of Second sheet
PI18S
PI19S
PI20S
Entry of Third sheet
Top edge
Figure 3-305
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CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
C.
Controlling the Movement of Sheets
When the leading edge of a sheet has moved past the inlet flapper, the intermediate feed roller and
the crescent roller start to move the sheet forward.
The intermediate feed roller is normally not in contact with the path bed. When the leading edge
of a sheet reaches the intermediate feed roller contact section, the feed plate contact solenoid (SL4S)
causes the roller to come into contact with the path bed so as to move the sheet. The contact is broken
as soon as the leading edge of the sheet reaches the paper positioning plate. This series of operations
is executed each time a sheet arrives.
causes the roller to come into contact with the path bed so as to move the sheet. The contact is broken
as soon as the leading edge of the sheet reaches the paper positioning plate. This series of operations
is executed each time a sheet arrives.
When the leading edge of the first sheet reaches the paper positioning plate, the paper positioning
plate paper sensor (PI8S) turns ON. The arrival of the second and subsequent sheets will not be
checked since the first sheet will still be over the sensor.
checked since the first sheet will still be over the sensor.
The crescent roller keeps rotating while sheets are being output, butting the leading edge of each
sheet against the paper positioning plate, and ultimately, keeping the leading edge of the stack in
order.
order.
The alignment plate motor (M5S) drives the alignment plates for each sheet so as to put both left
and right edges of the sheet in order.
1) The solenoid turns ON while paper is being moved so that the feed plate comes into contact.
SL4S
Feed plate contact
solenoid
ON
Feed motor
Intermediate feed roller
M1S
Figure 3-306
3-22
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
2) The solenoid turn OFF when the paper butts against the paper positioning plate. The feed motor
continues to rotate.
SL4S
OFF
M1S
Figure 3-307
3) The solenoid turns ON when the next sheet arrives, and the feed plate comes into contact.
SL4S
ON
M1S
Figure 3-308
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CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
D.
Aligning the Sheets
The alignment motor (M5S) drives the alignment plates each time a sheet is output, putting both
left and right edges of the sheet in order. The alignment plate motor is a 4-phase stepping motor. The
position of the alignment plate is identified in reference to the number of motor pulses from the
alignment plate home position sensor (PI5S).
position of the alignment plate is identified in reference to the number of motor pulses from the
alignment plate home position sensor (PI5S).
The following briefly describes what takes place when the saddle stitching mechanism operates
on two sheets.
1) When the first sheet has been output, the alignment plates butt against the left and right edges of
the stack (first alignment). The alignment plates leave the home position in advance and remain
in wait at points 10 mm from the edges of the stack.
in wait at points 10 mm from the edges of the stack.
Sheets
Paper positioning
plate
plate
Alignment
plate
plate
Alignment
plate
Alignment plate
home position sensor
(PI5S)
home position sensor
(PI5S)
Figure 3-309
2) The alignment plates move away from the edges of the stack over a short distance and then butt
against the edges once again (Second alignment).
Figure 3-310
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