III –
5
Paper pulling-in and registration mechanism
The paper pulling-in and registration mechanism consists of the pull-in roller gear (incorpo-
rated in the multi-purpose sheet feeder), planetary gear system, paper feed solenoid, sole-
noid lever, clutch release lever, and registration sensor. (For the details about the sensor,
refer to Section 2.3.)
If the main motor rotates clockwise, the rotation is transmitted to the intermediate gear of the
planetary gear system. As the intermediate gear rotates, the pull-in roller drive gear also ro-
tates since the clutch gear is locked by the solenoid lever and the clutch release lever. Ac-
cordingly, the pull-in roller in the multi-purpose sheet feeder rotates to pull in paper into the
equipment, a sheet at a time.
If the paper feed solenoid is retracted and the clutch release lever is operated according to
the cam profile of the pull-in roller gear so as to release the clutch gear, the clutch gear ro-
tates and the pull-in roller drive gear does not rotate. In this way, the clutch gear switches
the transmission of the motor rotation on and off to the pull-in roller drive gear.
The solenoid on/off timing and the clutch release lever timing allow this mechanism to pull in
a sheet and register it against the registration roller.
Paper feeding and ejecting mechanism
If the main motor rotates clockwise, the rotation is transmitted via the gear train to the drum
drive gear, heater roller drive gear, and paper ejection roller drive gear.
After the paper passes through the heat-fixing process, it will be ejected onto the paper tray.
If the leading edge of the paper pushes up the actuator of the paper ejection sensor, the
photo sensor becomes opened, signaling the start of paper ejection. If the trailing edge has
passed through the sensor actuator, the sensor becomes closed, signaling the completion of
paper ejection. Then, the main motor stops rotation.
Paper ejection
roller drive gear
Gear drive unit
Heater roller drive gear
Drum drive gear
Gear 20/90
Main motor
Pull-in roller drive gear
Intermediate gear
Clutch gear
Solenoid spring
Clutch release lever
Solenoid lever
Clutch spring
Paper feed solenoid
(Front)
Planetary
gear
system
Summary of Contents for MFC 4550
Page 5: ...CHAPTER I GENERAL DESCRIPTION ...
Page 14: ...CHAPTER II INSTALLATION ...
Page 15: ...CONTENTS 1 INSTALLING THE UPDATE DATA TO THE FACSIMILE EQUIPMENT II 1 ...
Page 18: ...CHAPTER III THEORY OF OPERATION ...
Page 49: ...CHAPTER IV DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 81: ...CHAPTER V MAINTENANCE MODE ...
Page 89: ...V 7 Scanning Compensation Data List 200 dpi ...
Page 133: ...CHAPTER VI ERROR INDICATION AND TROUBLESHOOTING ...
Page 163: ...MAIN 8 8 FAX3550 3650 8000P 8200P MFC4550 6550MC 7550MC MFC9000 9500 A ...
Page 185: ...D CONTROL PANEL 1 2 ...
Page 187: ...E POWER SUPPLY 120 V Low voltage power supply ...
Page 188: ...E POWER SUPPLY 200 240 V Low voltage power supply European versions ...
Page 189: ...E POWER SUPPLY 200 240 V Low voltage power supply Asian versions ...
Page 190: ...E POWER SUPPLY High voltage power supply ...
Page 191: ...Sept 98 5X52012 Printed in Japan ...