Sharp AR-SS2 Service Manual page 32

AR-SS2
b. Stapler motor ON/OFF control
ON/OFF and the rotation direction of the stapler motor are control-
led by the combination of the following two signals.
1. Stapler motor forward rotation signal (SPMCW
2. Stapler motor reverse rotation signal (SPMCCW
Stapler motor rotating direction
Forward
Reverse
Stop
c. Stapler motor overcurrent protection
When the stapler motor starts rotation, the current detection circuit
detects the current flowing through the stapler motor.
When an overcurrent is detected, the current detection circuit
turns on Q54 and Q55 to control the stapler motor drive.
3) Stapler motor staple jam control
When a staple jam occurs in the stapler unit, the stapler motor (M5) is
controlled as follows.
1) An overload is applied to the stapler motor by a staple jam.
↓
2) The stapler does not return to the home position within about
0.6sec after starting stapling.
↓
3) The stapler motor is rotated in reverse to return to the home
position of stapling.
↓
4) An alarm is made to the copier.
4) Safety switch (MS3)
When your finger enters the stapling position, the actuator is lowered
to turn off the safety switch. When the safety switch is turned off, the
stapler motor (M5) power is cut off and the signal is sent to the CPU
to turn off the drive signal of the stapler motor (M5) to stop stapling.
Actuator
∗
)
∗
)
∗ ∗
SPMCW SPMCCW
1 0
0 1
1 0
Safety switch (MS3)
5) Staple empty detection
The staple empty detection in the staple cartridge is made by the
staple empty detection switch (MS5) provided in the stapler.
The staples in the staple cartridge are pushed up by the spring and
the plate. the staples are also pushed toward the tip of the stapler.
When there are staples in the cartridge, the staple empty detection
switch (MS5) is pushed by the staples and the sorter controller
detects presence of the staples.
When the staples are exhausted (when the remaining quantity of the
staples becomes about 40 pcs.), the staple detection switch (MS5) is
opened (MS5: normal open), and the sorter controller detects staple
empty. At the same time, the sorter controller displays the staple
supply display.
When staple empty is detected, stapling is stopped. When, however,
staple empty is detected during continuous stapling, stapling is
stopped after completion of the job.
(3) Stapler unit oscillation control
1) Outline
When the bin is shifted, the stapler unit oscillates as shown below so
that the stapler unit does not make contact with the paper in the bin.
Oscillation is performed by the stapler unit oscillation motor (M4).
When the stapler unit reaches the stapling position, the drive power is
supplied to the stapler motor.
To detect the home position, the stapler home position switch (MS4)
is provided.
9 – 13
Staple feed roller
Staple empty
detection switch
Cartridge empty
detection switch
MS6
MS5
Staple
Plate
Spring
Staple cartridge
MS6
MS5