Figure 2-1-4 Paper switchback/refeed path
1. Refeed roller
2. Refeed pulley
3. Registration sensor (actuator)
4. Conveying roller
5. Conveying pulley
6. Exit sensor (actuator)
7. Change guide
8. Lower exit pulley
9. Lower exit roller
10. Upper exit pulley
11. Upper exit roller
(3) Switchback/refeed system
Paper that has already being fixed in the fuser unit on its first (front) side will be conveyed along the guide towards the face-
down tray via the turning of the fuser unit’s lower exit roller. At this point, the fuser unit’s upper exit roller is turning in a
forward direction and, in the case of 1-sided printing, the paper will be ejected onto the face-down tray through the normal
action of that upper exit roller. However, in the case of duplex (2-sided) printing, once a specified amount of time has
elapsed after the trailing edge of the paper turns off the exit sensor actuator (located inside the fuser unit), the fuser unit’s
upper exit roller will begin to turn in the opposite direction in order to reverse the direction of the paper feed. Then, the
operation of the change guide and the direction of rotation of the lower exit roller will be applied to stop the paper from being
fed back inside the fuser unit and, instead, will guide the paper into a section below the fuser unit. Next, after the paper has
turned on the lower exit sensor actuator, that paper A will be fed to the conveying roller. Once the paper reaches the
conveying roller, it will be fed towards the refeed roller through the action of the conveying roller. Once the paper reaches
the refeed roller, it will be fed via the turning of that roller and, at the point that it turns on the registration sensor, the initial
feeding (refeeding) operation of the second (rear) side is complete.
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