Risograph

Risograph is a brand of digital duplicators manufactured by the Riso Kagaku Corporation,[1][2] that are designed mainly for high-volume photocopying and printing.

Because the process involves real ink like in offset printing, and does not require heat to fix the image on the paper that a photocopier or laser printer does, the output from a risograph can be treated like any offset-printed material.

The Riso MZ series models have two ink drums, thereby allowing two colors to be printed in one pass.

It's possible to print a document sending it via USB or scan it analogically with the platen glass scanner.

Machines similar to Risographs are manufactured by Ricoh, Gestetner, Rex Rotary, Nashuatec and Duplo.