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Some toner cartridges incorporate the drum unit in the design, and both drum and cartridge are replaced simultaneously; cost of a cartridge is higher than a toner-only cartridge, although separate drum replacement is avoided. Toner cartridges have the same function as ink cartridges used by inkjet printers.
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 ...
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.
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Ink cartridges are typically priced at $13 to $75/US fl oz ($1,664 to $9,600/US gal; $440 to $2,536/L) of ink, [15] meaning that refill cartridges sometimes cost a substantial fraction of the cost of the printer. To save money, many people use compatible ink cartridges from a vendor other than the printer manufacturer [citation needed].
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There is a clamp plate on the drum that opens by motor. The drum turns and the old master material is fed into the disposal rollers and into the disposal box. The new master is fed into the clamp which closes, then the drum is turned, pulling the master onto the drum. The outside of the drum is covered in screens and the inside is coated in ink.
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