Sharp AR-SS2 Service Manual page 31

(2) Stapler unit
1) Outline
The staple unit composition is shown in the figure below.
Stapling is driven by the stapler motor (M5). Stapling is made by the
rotation of the cam. The staple home position sensor (PI8) detects
one cycle of stapling.
The cartridge empty detection switch (MS6) detects the staple
cartridge empty. The staple empty detection switch (MS5) detects
staple empty in the cartridge.
2) Stapler motor (M5) control
a. Outline
The block diagram below shows the stapler motor control circuit.
The stapler motor is a DC motor. This circuit has the following
functions.
•
ON/OFF control of the stapler motor
•
Rotating direction control of the stapler motor
•
Overcurrent protection of the stapler motor
Stapler safety switch
+24
R156
Stapler motor
M5
Current
detection
circuit
NO
MS3
Sorter controller PWB
R15
Q47 Q48 R158
Q4
Q50
Q52
R164
R16
Staple cue
sensor
PI9
PI8
The stapler safety switch is provided in the power supply path to
the stapler motor (M5).
When a material of about 5.5mm or greater enters the staple
section, the stapler safety switch (MS3) cuts off the power source
for driving the stapler motor (M5).
Q51
12
11
Q56
Q43
+5V
R16
Q43
Q54
Q56
D32
D33 Q55
9 – 12
AR-SS2
Stapling home
position sensor
Stapler motor
Cartridge empty
detection switch
MS5 MS6
Staple empty
detection switch
+5V
+5V
R159
R160
SPMCW
SPMCCW
+5V
R173