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The drum areas that are exposed to light become conductive and therefore discharge to the ground. The drum area not exposed to light (those areas that correspond to black portions of the original document) remains negatively charged. Developing: The toner is positively charged. When it is applied to the drum to develop the image, it is ...
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.
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.
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.
Gary Starkweather (seen here in 2009) invented the laser printer.. In the 1960s, the Xerox Corporation held a dominant position in the photocopier market. [2] In 1969, Gary Starkweather, who worked in Xerox's product development department, had the idea of using a laser beam to "draw" an image of what was to be copied directly onto the copier drum.
Chain Printers place the type on a horizontally-moving circular chain. As with the drum printer, as the correct character passes by each column, a hammer is fired from behind the paper. Compared to drum printers, chain printers have the advantage that the type chain can usually be changed by the operator.