Transport Roller - Toshiba 8070 Service Manual

15. AUTOMATIC DUPLEXING UNIT (ADU)
15.1 Introduction
The Automatic Duplexing Unit (ADU) is a device for automatically making copies on both the front and
rear sides of paper. The ADU also has a stack function that allows up to 60 copies to be made on both
sides of the paper in a single operation. In other words, the stack function operates to make copies on the
rear side for the number of sets specified when making multiple sets of copies, and stacking these sets.
Up to 60 sheets can be stacked. Double-sided copying is completed by making the next copy on the rear
side of the paper by re-feeding the stacked copies for the specified number of copies.
As the ADU uses the FIFO (First In First Out) system, it is structured to re-feed copy paper from the
bottom side. The exit section is provided with a reversal mechanism for offsetting the order of double-
sided copying depending on the double-sided copy mode (for example, when the one-sided and double-
sided mode are selected for odd-numbered originals without the number of originals specified) using the
ADF.
The ADU comprises the following mechanisms:
(1) ADU/exit switching gate
This gate is for guiding paper output from the fuser to the ADU.
During one-sided copying, and after double-sided copying is completed, the movement of this gate
guides copy paper to the copy tray.
(2) ADU inlet/reversal roller
This roller is for guiding the paper to the stack section from the gate. During the reversal exit opera-
tion, it guides the copy paper again to the stack section. Reversal of this roller turns the paper over,
and guides the paper to the copy tray from the exit section.
(3) Stack section
This is where paper is stacked. This section is provided with guides for aligning the leading and
trailing edges, and left and right sides of the paper.
(4) Holding gate section
This section functions to hold stacked paper for re-feeding, and to receive paper to be stacked.
Rotation of this gate re-feeds paper while simultaneously stacking paper.
(5) Re-feed section
This feed mechanism is for guiding paper on the stack section again to the copier. It comprises a
pick-up roller, feed roller, separation belt, aligning roller and other parts.
(6) Transport section
This section comprises a transport roller and transport guide for guiding re-fed paper to the feed
section on this copier.
Mar. 1999 © TOSHIBA TEC Mar. 1999 © TOSHIBA TEC 15 - 1A 15 - 1 8070/6570/5570/4580 ADU 8070/6570/5570/4580 ADU