A photocopier, often called a copier or copy machine, is a device that produces paper copies of documents and images. Modern machines may be dedicated copiers or integrated multifunction devices that also print, scan and fax. Photocopiers range from small desktop units to large, high-volume systems used in commercial print shops.
How it works
Most traditional photocopiers use the xerographic process: a bright light scans an original, projecting its image onto a photoconductive surface. Electrostatic charges attract toner particles to the charged areas, and the toner is then fused to paper with heat and pressure. Digital copiers replace some optical steps with image sensors and electronic processing but still rely on toner and fusing in many designs.
Main components
- Document feeder or glass platen for originals
- Light source and optics or image sensor
- Photoconductor drum or belt
- Toner supply and developer unit
- Fuser assembly (heat rollers)
- Paper trays and transport mechanisms
Maintenance needs include toner replacement, cleaning of sensors and rollers, and occasional parts servicing. Color copiers add separate toners and more complex image registration.
History and impact
The basic xerographic principle was developed in the 20th century and led to commercially successful machines that transformed office workflows by making rapid, inexpensive duplicates possible. The technology altered document handling, record keeping and information sharing and contributed to the rise of office automation.
Uses and notable facts
Photocopiers are ubiquitous in offices, schools, libraries and copy shops for reproducing reports, forms, photographs and legal documents. They raise legal and ethical issues such as copyright and document security; many modern systems include access controls, audit logs and secure printing features. The brand name "Xerox" became closely associated with photocopying in everyday language, illustrating the device's cultural impact.