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e-STUDIO3511/4511 AUTOMATIC DUPLEXING UNIT 17 - 2 November 2003 © TOSHIBA TEC
17
17.2 Description of Operations
The back side printing (recording data of the back side of paper) is performed first by selecting duplex
printing mode and pressing the [START] button. When the trailing edge of the paper passes the exit gate,
the paper is switchbacked by the exit roller and transported into the ADU (the exit gate is closed with its
own weight), and then the switchbacked paper is transported with acceleration. The transportation de-
celerates in front of the upper transport roller of the ADU. The front side printing (recording data of the
front side of paper) is performed at the registration section. The paper passes through the exit gate again
and is transported to the receiving tray to complete duplex printing.
There are three methods of judging a paper jam: (1) whether the ADU entrance sensor is turned ON or
not in a specified period of time after the switchback to the ADU started (E510). (2) whether the ADU exit
sensor is turned ON or not in a specified period of time after the ADU entrance sensor is turned ON
(E520). (3) whether the registration switch is turned ON or not in a specified period of time after the paper
feeding from the ADU to the equipment (E110).
If the ADU is opened during duplex printing, the ADU motor and ADU clutch are stopped, namely, ADU
open jam occurs (E430).
The equipment is never to be stopped during printing by interruption in any case except paper jam or
service call.
The operation of the duplex printing differs depending on the size of the paper; single-paper circulation
and alternateness circulation. The figures in the following pages show the circulating operations during
duplex copying. The numbers in the figures indicate the page numbers.