![]() ![]() ![]() That means, in one minute, 605 inches of paper pass through the machine. The maximum engine speed of an M601 is 55 pages per minute. I did the math on this, and it's pretty impressive. In older printers, the speed of the Scanner Motor's rotation determined that there would be 300 "sweeps per inch of drum rotation, corresponding to one inch of paper feed (thus 300 dots per inch). The diode itself doesn't move but fires directly at a rotating polygonal mirror.Įach mirror facet determines one "sweep" from left to right, also called a "scanning line." As the Scanner Motor rotates the polygonal mirror, successive facets are exposed to the laser, producing successive sweeps. ![]() The diode is precisely aimed at one point within the assembly. The diode is mounted on a board that regulates it and receives power to fire it on the Laser/Scanner Assembly. In HP printers, the light is produced by a small modulated Laser Diode. Writing, then, becomes a matter of control, focus and timing. That's the equivalent of what you have once the OPC is charged. Lay it back down against the backing and it's ready to be written on gain (conditioned). When you pick up the film on the Slate, separating it from the soft, dark background, you erase the existing image (cleaning). Writing - Think of the OPC as a child's "magic slate" toy. Additionally, the uniform negative potential bias applied by the Charge Roller. This is what eliminates the need to Erase Lamps. PCRS is coated with a conductive rubber supplied with an AC bias that is applied to erase any residual charges on the drum and to maintain a constant drum surface potential. On the other hand, produce only trace amounts of ozone and eliminate the need for Erase Lamps, as well. Is that they create a dangerous gas called ozone (a negative DC current twenty times the ozone produces produced by a positive current). The problem with using Corona Wires, particularly negative DC Corona Wires, The corona results in a uniform minus six-thousand DC volt charge on the screen that smooths the resultant charge before it reaches the drum surface (-6KVDC). Separating the wire from the drum is a varistor grid drum. This ionizes the air around the wire, creating a corona effect. Minus six-thousand volts DC (-6KVDC) are sent through the wire, which has no ground. Corona Wires work by ionizing the air adjacent to them. In newer printers, it is accomplished by a Primary Charge Roller. In older printers, this was done by a Primary Corona Wire. Later development introduced Primary Charge Rollers (PCRS) that combine electrostatic cleaning with conditioning and eliminate the need for Erase Lamps.Ĭonditioning - Before any image can be produced, the OPC must be conditioned so that a uniform negative charge can be given to the drum. This effectively grounded the drum surface in that area, discharging it uniformly and destroying any latent image. Erasure was accomplished by focusing incandescent light through red filters onto the drum in the area just past the Cleaning Blade. Cleaning - In older printers, cleaning required two steps: (1) Toner left on the drum from the last transference was wiped off by a Cleaning Blade and (2), the remaining electrostatic image had to be erased. ![]()
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