Konica Minolta bizhub c650 Service Manual page 139

16. Paper feed section
B. Paper feed speed reduction control
• When paper reaches the tray1 (tray2) paper feed sensor, if the interval between the
paper and the preceding paper is short, the take-up motor speed is reduced temporarily
to adjust the paper interval to the proper one.
• When paper reaches the tray1 (tray2) vertical transport sensor, if the interval between
the paper and the preceding paper is short, the tray1 (tray2) vertical transport motor
reduces its speed (in the case of transport speed 216 mm/s or more) or stops (in the
case of transport speed 132 mm/s or less) in order to adjust the paper interval to the
proper one.
• Paper from the Tray1 and Tray2 is transported at the same speed with the system speed.
Example: Short paper interval
C. Double feed control
• After the take-up motor is turned ON, if it is not turned OFF (no paper) by the time when
the paper is supposed to be at the paper feed sensor, the machine judges that a double
feed is occurring and reduces the rotation speed of the paper feed roller (take-up motor).
Timing roller sensor (PS38)
Tray1 vertical transport
sensor (PS4)
Tray1 paper feed roller
Tray2 vertical transport sensor
(PS12)
Tray2 paper feed roller
104
Short paper interval
Tray1
Tray2
Theory of Operation Ver. 8.0 Jun. 2008
Preceding paper
Sensor
Paper to be controlled
A00JT2C317AA
Timing roller
Tray1 vertical transport roller
First sheet of paper
Second sheet of paper
Tray1 paper feed sensor (PS5)
Tray2 paper feed sensor (PS13)
A00JT2C213AA