- First principle photocopier’s job is Lighting, which is very bright light produced by exposing lamps that illuminate the document that has been placed on the glass with the position upside down on the glass, will then reflect the image in the document through the lens. The image is then directed towards the drum tube by the lens. Light-sensitive selenium coatings Drum tubes.
- A brighter image on the drum’s surface will cause electrons to appear and neutralise the positive ions produced by the incandescent wire (corona wire) on the top of the drum (wire 1), resulting in a bright surface.
- Positively charged powder black (toner) on the developer will be attracted by positive ions on the drum’s surface.
- A high voltage DC applied to an incandescent wire (corona wire) charges the drum positively. There are two pieces of incandescent wire (corona wire), one on the drum (wire 1) and one under the drum (wire 2).
- When the drum rotated, a piece of paper passed beneath it. Before the paper reaches the drum, it is positively charged by wire two so that the toner attached to the paper is strongly attracted to the paper because the tensile force of the positive charge on the paper is greater than the positive charge on the drum plus the gravitational force.
- The next paper will be missed by the machine due to two pressurised hot rollers. The heat from both rollers will exhaust the toner, causing it to adhere tightly to the paper. This event will generate a copier or copy of the image that is identical to the original.
- After the toner has been transferred to the drum, the paper will continue to spin until it passes through the cleaning (cleaning balde) drum cleaner and then through wire 1 (primary corona wire) so that the drum is once again positively charged and ready to be re-illuminated continuously.
