5016-001
Sheet Bypass Paper Feed Unit
Operation of the sheet bypass paper feed unit (multipurpose tray)
When the sheet bypass tray is closed and printing is started, revolution of the developer/paper feed motor is transmitted to the clutch gear and timing clutch gear of the sheet bypass paper feed assembly.
When the bypass paper feed clutch activates, the sheet bypass paper transfer roll is lowered and touches the paper in the tray. When the paper transfer roll touches the paper in the paper tray, the paper is fed into the printer by the actions of the paper transfer roll and paper feed roll.
As paper is fed to the timing roller by the sheet bypass paper feed roll, the paper pass sensor detects paper is present. This sensor is located just prior to the timing roller. After the paper is detected, and passes through the sensor, the sheet bypass clutch turns off, and the sheet bypass paper feed and sheet bypass paper transfer roller stop rotating. At the same time, the paper transfer roller is lifted up by the return spring so that the paper will touch the timing roll and wait.
Note: If the transparency paper sensor located in front of the timing roller detects a transparency, the printer slows to the half speed mode.
At the same time the image is transferred from the organic photo conductor (OPC) to the transfer belt, the timing clutch turns on and the timing roll begins rotating. Paper is then fed into the image transfer area, registering the image on the sheet of paper.
Double feed prevention
The double feed prevention pad contacts the sheet bypass
paper feed roller at a specific pressure. Whenever multiple sheets of paper are fed, the bottom sheet is stopped by friction of the double feed prevention pad, which aids in preventing double feeding. Only the top sheet of paper is fed by the paper feed roller.
The paper pass sensor checks paper fed from the sheet bypass paper feed assembly. If the sensor does not detect paper during a specific time, a paper jam error displays.
General Information
