In 1970 Xerox introduced the convenience copier Xerox 4000. It was a compact and quite copier, with two paper trays. This was the first copier in the world, that could copy on both sides automatically. The machine was also well suited for copying from bound volumes. Its exposure platen came right up to the edge of the machine allowing individual pages to be copied without having to open the book hat.
Later on the 4000 was produced with automatic or semi-automatic document feed, wich was a great success, especially in business offices for copying multipage unbound documents. This one feature changed the general configuration of copiers to the extent that there has never again been a true edge copier like the Xerox 4000.
In 1970, automatic density control (ADC) sensors were introduced with Xerox 4000 duplicators and subsequently used in various forms in the 5600 and 9200 families. Using the ADC sensors, somewhat frequent manual adjustments were made to the toner control
Toner and drums were tested to ensure manufacturing quality, in the test facility at Welwyn Garden City. In this photo you can see 3600, 4000, 7000 and 660 copiers.
Some advertisements of the Xerox 4000 copier:
|(Centimeter / inches)||(K grams / Lbs)||Floor Space Requirements (Meters/Feet)|
|Depth: 72 / 28
Width: 83 / 33
Height: 97 / 38
|Weight: 95.5 / 210.6||n/a|
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