The Xerox 720 was another version of the 914 copier, and the only difference was...
The 720 Copier / Duplicator, as it was styled, was a double speed version of the Xerox 420. By the re-gearing of a more powerful main motor, throughput was doubled from 7 copies per minute to 14 copies per minute. Output speed was only maximised to 17 cpm. with a later field modification, known as the Short Scan mod.
The 720 came with Differential Billing as standard, complete with the steel tube, platen cover handle, a flush front door, a new two tone grey paint job and a 'Collator Unit' which was a set of 10 shelves designed, in the main to make the machine look different.
Short scan was achieved by initiating optical 'Flyback' at the normal A4 length, thus saving about 2 inches per scan and speeding up the machine to, a theoretical, 17cpm. It was rarely, if ever, used.
However, speeding up the machine was not simply a matter of gearing.
A faster, and less robust, drum coating needed to be used, along with brighter lamps and increased corotron currents. An uprated developer also had to be formulated and a bigger, hotter fuser unit fitted. Then, the drum cleaning unit had to be uprated and a larger capacity filter bag fitted.
Thanks to Stuart Yearsley for providing this information.
|Copy speed (per minute)||14|
|Output tray capacity||n/a|
|Dimension and weight|
|Depth||115.6 (cm) / 45.5 (inches)|
|Width||115.6 (cm) / 45.5 (inches)|
|Height||104.1 (cm) / 41 (inches)|
|Weight||327 (K grams) / 720 (Lbs)|
|Floor space requirements||n/a|