Toshiba 4560 Service Manual page 173

13.3 Description of ADU Operation
13.3.1 Paper stacking operation
When the ADU (duplex copying) mode is selected and the PRINT key is pressed on the copier's control
panel, the ADU motor starts rotating, and the side guides and the end guide in the stacking section are
moved to the positions corresponding to the selected size of paper by their respective motors. Then, the
stack clutch comes ON, the transport roller rotates and the EXIT/ADU selection gate is switched in the
direction of the stacking section by the gate solenoid.
The copy paper which has exited from the copier is sent into the ADU's open guide by the EXIT/ADU
selection gate. This paper is further carried by transport rollers into the stacking section, where the paper
is stacked face up. This operation is repeated until the specified number of sheets are stacked.
At the start of the stacking operation, the side guides are set with a 5 mm gap relative to each side of the
paper, and each time 5 sheets are stacked consecutively during stacking, the side guides perform a
paper aligning operation.
A jam switch is provided to have paper jams in the open guide detected. The empty switch is to detect
whether or not paper is present in the stacking section.
13.3.2 Duplex copying
After the paper stacking operation, when a second original is set and the PRINT key is pressed, the ADU
motor starts rotating, causing the elevator arm to rotate. This will cause the tray positioned under the
stacked sheets of paper to rise, making the sheets come into contact with the rotating pick-up roller and
sending the topmost sheet out. The separation roller rotates with the feed roller. At this time, if two or
more sheets are sent out, the separation roller stops rotating, causing the lower sheet(s) to stop its
movement.
The sheet of paper thus sent out is carried by the copier's upper transport roller to the copier's aligning
roller and aligned. The sheet is then copied on the side not copied previously. The sheet copied on both
its sides passes through the copier's exit roller and over the EXIT/ADU selection gate which is already
positioned in the direction of exiting, further passing through the exit roller to exit finally into the receiving
tray.
4560/4570 ADU 13 - 6 Nov. 1997 © TOSHIBA