Sharp AR-F12 (serv.man6) Service Manual ▷ View online
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
3-27
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
3-28
CHAPTER 3 SADDLE STITCH UNIT BASIC OPERATION
IV. STITCHING SYSTEM
1.
Outline
The stitching system “stitches” the center of an output stack with staples.
To enable stitching at two locations on a stack, two stitcher units (front, rear) are used. Each
To enable stitching at two locations on a stack, two stitcher units (front, rear) are used. Each
stitcher unit is equipped with a stitcher motor (M7S, M6S) for drive, a stitcher home position sensor
(MS7S, MS5S) for detection of position and a staple sensor (MS6S, MS4S) for detection of the
presence/absence of staples.
(MS7S, MS5S) for detection of position and a staple sensor (MS6S, MS4S) for detection of the
presence/absence of staples.
The stitcher base is designed so that it may be drawn out to the front from the saddle stitcher for
replacement of the staple cartridge or removal of a staple jam. The stitcher unit in sensor (PI16S) is
used to make sure that the stitcher base is properly fitted to the saddle stitch unit.
used to make sure that the stitcher base is properly fitted to the saddle stitch unit.
Safety switches are not mounted for the saddle stitch unit (front, rear), as the location does not
allow access by the user.
Stitcher (rear)
Stitcher (front)
Stack
Figure 3-401
