Sharp AR-F12 (serv.man4) Service Manual ▷ View online
3-24
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
3) The alignment plates escape to points 10 mm from the edge of the stack.
Figure 3-311
4) When the following stack arrives, steps 1 through 3 above are repeated.
5) The alignment plates butt against the stack once again, during which stitching takes place.
5) The alignment plates butt against the stack once again, during which stitching takes place.
Figure 3-312
6) The alignment plates escape to points 10 mm from the edges of the stack, after which folding and
delivery take place.
Figure 3-313
7) When the first sheet of the following stack reaches the No.1 paper sensor, the guide moves to a
point 10 mm from the edge of the stack to be ready for the next alignment operation.
Figure 3-314
3-25
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
Alignment plate home
position sensor (PI5S)
position sensor (PI5S)
Paper positioning plate
motor (M4S)
motor (M4S)
Alignment motor (M5S)
: Alignment
: Escape
Entry of
1st sheet
Entry of
2nd sheet
1st sheet of follow-
ing stack entry
In case of 2 sheets:
[1]: Move to wait position
[2]: Stapling period
[3]: Paper folding/delivery period
[4]: Move to following stack size wait position
[2]: Stapling period
[3]: Paper folding/delivery period
[4]: Move to following stack size wait position
[1]
[2] [3] [4]
Figure 3-315
M5S
Alignment motor
Alignment plate
Alignment plate
Alignment plate
home position
sensor (PI5S)
home position
sensor (PI5S)
Stack
Paper positioning plate
Figure 3-316
3-26
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
E.
Controlling the Phase of the Crescent Roller
1.
Outline
If alignment was executed with the crescent roller in contact with the stack of sheets, the resulting
friction against the roller causes the stack to move inappropriately (Figure 3-317). To prevent this
problem, the phase of the roller is identified and used to determine the timing of alignment.
problem, the phase of the roller is identified and used to determine the timing of alignment.
The phase of the crescent roller is identified by the crescent roller phase sensor (PI12S). The flag
for the crescent roller phase sensor is mounted to the crescent roller shaft. The flag will leave the
sensor while the roller shaft rotates, turning the sensor ON or OFF, enabling the assumption that the
crescent roller is positioned at the opposite side of the stack (Figure 3-319). The alignment plates are
operated to correspond with this change in the state of the sensor.
sensor while the roller shaft rotates, turning the sensor ON or OFF, enabling the assumption that the
crescent roller is positioned at the opposite side of the stack (Figure 3-319). The alignment plates are
operated to correspond with this change in the state of the sensor.
Crescent roller
phase sensor (PI12S)
phase sensor (PI12S)
Flag
Feed motor
Stack
Crescent roller
Alignment plates
M1S
Figure 3-317
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CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
Alignment plates
Crescent roller
phase sensor(PI12S)
phase sensor(PI12S)
If the crescent roller
was in contact with the
stack, alignment opera-
tion could be obstruct-
ed.
was in contact with the
stack, alignment opera-
tion could be obstruct-
ed.
Sensor flag
Crescent roller
Figure 3-318
Alignment operation is
started when the flag has
covered the sensor and
the crescent roller is
away from the stack.
started when the flag has
covered the sensor and
the crescent roller is
away from the stack.
Figure 3-319
Crescent roller phase
sensor (PI12S)
sensor (PI12S)
First sheet
Second sheet
Feed motor
stops
stops
Alignment operation
Feed motor (M1S)
Figure 3-320
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