Konica Minolta bizhub C658 Service Manual page 1846

bizhub C658/C558/C458/C368/C308/C258
• After the lapse of a predetermined period of time, the bypass pick-up solenoid is deenergized. The paper lift-up plate is stopped at the
paper feed position.
• The actuator of bypass lift-up position sensor rotates in synchronism with the paper lift-up cam. When the paper lift-up plate is raised,
the actuator rotates to thereby unblock the bypass lift-up position sensor. Then, the machine determines that the paper lift-up plate is
raised to the paper feed position.
• If the bypass lift-up position sensor remains unblocked even after the bypass pick-up solenoid has been deenergized, the machine
determines that the paper lift-up plate is at the paper feed position.
• As the paper level lowers during paper feed, the spring pushes up the paper lift-up plate, so that the paper stack is pushed up to the
optimum paper feed position.
[1]
[1] Paper lift-up cam (standby position)
[3] Paper lift-up cam (paper feed position)
(b) Move to standby position (down)
• The paper lift-up plate is lowered if there is no print job that uses the manual bypass trays and the paper exit sensor detects a sheet of
paper fed from the manual bypass tray.
• The paper lift-up plate is lowered if the above conditions are met even during execution of another job.
• If a bypass paper empty condition is detected at the paper feed position, the paper lift-up plate is lowered to the standby position.
• If a paper misfeed occurs, the paper lift-up plate is stopped at the paper feed position. When the transport motor rotates stably after the
misfeed is cleared, the paper lift-up plate is lowered to the standby position.
• After the lapse of a predetermined period of time, the bypass pick-up solenoid is deenergized. The paper lift-up plate is stopped at the
standby position. As the paper lift-up plate lowers, the bypass lift-up position sensor is blocked. The machine determines that the paper
lift-up plate is at the standby position based on the fact that the bypass lift-up position sensor is blocked even after the bypass pick-up
solenoid has been deenergized.
10.4.2 Paper feed control
(1) Pick-up control (bizhub C368/C308/C258)
• Paper feed operations of the manual bypass tray are driven by the transport motor.
• The bypass pick-up solenoid is energized by a print start signal and the paper is raised to the paper feed position.
• After the paper is raised to the paper feed position, the bypass paper feed clutch is energized.
• When the bypass paper feed clutch is energized, the drive from the transport motor is transmitted to the manual bypass tray paper feed
roller, so that the paper can be fed in.
• The manual bypass tray paper feed roller feeds the paper onto the registration roller.
• When the paper fed from the manual bypass tray is reached onto the registration roller, the bypass paper feed clutch is deenergized to
stop the manual bypass tray paper feed roller from rotating.
• The bypass pick-up solenoid is energized and the paper is lowered to the standby position.
• If the registration sensor does not detect paper even after the lapse of a predetermined period of time, the machine determines that there
is a paper misfeed at the manual bypass tray. Note, however, that the paper feed sequence is repeated a second time if a paper misfeed
is detected. If the registration sensor is still unable to detect paper, the machine determines that there is a paper misfeed at the manual
bypass tray. (Paper feed retry control)
O THEORY OF OPERATION bizhub C658/C558/C458/C368/C308/C258 > 10. PAPER
[2]
FEED SECTION (MANUAL BYPASS TRAY)
[3]
[4]
[2] Paper lift-up plate (standby position)
[4] Paper lift-up plate (paper feed position)
O-71