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A photocopier (also called copier or copy machine, and formerly Xerox machine, the generic trademark) is a machine that makes copies of documents and other visual images onto paper or plastic film quickly and cheaply.
The single-drum machine used a single drum for ink transfer to the stencil, and the dual-drum machine used two drums and silk-screens to transfer the ink to the stencils. The single drum (example Roneo) machine could be easily used for multi-color work by changing the drum – each of which contained ink of a different color.
The outside of the drum is covered in screens and the inside is coated in ink. The screens make sure the ink flow is regulated. The paper is fed to the drum, and the ink only comes through the master material where there are holes. A pressure roller presses the paper to the drum and transfers the ink to the paper to form the image.
Magnification of color laser printer output, showing individual toner particles comprising 4 dots of an image with a bluish background. As the drum completes a revolution, it is exposed to an electrically neutral soft plastic blade that cleans any remaining toner from the photoreceptor drum and deposits it into a waste reservoir.
A drum is inferior to a belt in the sense that although it is simpler than a belt, it must be buffered gradually in parts rolling on the curved drum, while the flat belt efficiently uses one exposure to make a direct passage. [4] In a laser or LED printer, modulated light is projected onto the drum surface to create the latent image.
A Hewlett-Packard laser toner cartridge. A toner cartridge, also called laser toner, is the consumable component of a laser printer.Toner cartridges contain toner powder, a fine, dry mixture of plastic particles, carbon, and black or other coloring agents that make the actual image on the paper.