How it Works Laser Printer

Lately inkjet printer / Conventional becoming obsolete. Computer users switch on a laser printer, which promises many advantages. But you know, how laser printers work?A laser printer works using the principle of static electricity. This principle also underlies how biased lightning hit the ground and so forth. Static electricity is the electric charge contained in the object / objects yangterisolasi, like a balloon and the human body. This static electricity, use the printer as a temporary glue. The core components of this system is the photoreceptor, a drum or cylinder. This drum is made of highly photoconductive material.
 
Drum 
The drum is given a positive charge. The drum then rotates, emitting a laser printer is small to the surface to release certain points. Laser would be interesting letters and pictures to be printed as a charge pattern.After the pattern is set, the printer coats the drum is positively charged toner - a smooth, black powder. Because it has a positive charge, the toner attached to the negative discharged areas of drums, but not positively charged. It is like writing on a soda can with glue, then rolling it over some flour: Flour just stick to the glue-coated part of the can, so you end up with a message written in powder.
Fuser 
After the paper through the drum, the paper will pass through the fuser / heating. In this section, the ink on the paper will be dried, so it will come out in the dry state, and not wet.
 
Liaison PC-Printer
Before a laser printer can work, the printer must receive the page data and figure out how to print something on the order paper. This task is the job of the printer controller.The printer controller is the main onboard computer laser printers. Communicate with the host computer (eg PC) via the communication ports, such as a parallel port or USB port. At the beginning of a print job, set a laser printer with the host computer how they will exchange data. Controller may have to start and stop the host computer periodically to process the information has been received.

Language Controller 
For a printer controller and the host computer to communicate, they must speak the same page description language. At the beginning of the printer, the computer sends a special kind of simple text file and the code provides the basic format printer information. Since these early printers had only a few fonts, this is a very simple process.
 
Preparing the Pages 
Once the data is structured, the controller began to put the page. Set margins, set of words and graphics of any kind. When the page is set up, the raster image processor (RIP) requires a data page, in whole or piece by piece, and breaks it into an array of tiny dots. As we shall see in the next section, the printer requires a page in this form so that the laser can write on the photoreceptor drum.In most laser printers, the controller stores all print-job data in its own memory. This lets the controller put different printing jobs into the queue so it can work through them one at a time. It also saves time when printing multiple copies of a document, because only the host computer to send data once.

Laser Assembly 
Since it's really interesting pages, printer laser system - or laser scanning assembly - must be very precise. Traditional laser scanning assembly includes:- Laser- The mirror moves- LensesLaser receives the page data that make up the text and images. When the beam moves in the drum, the laser emits pulses of light for every dot to be printed, and no pulse for each point of space.Laser does not actually move the beam itself. The light bounces off a movable mirror instead. As the mirror moves, it shines light through a series of lenses. This system compensates for image distortion caused by varying the distance between the mirror and points along the drum.

The laser assembly moves in one plane, horizontally. After each horizontal scan, the printer moves the photoreceptor drum up a notch so the laser assembly can draw the next line. A small print engine computer synchronizes all of this perfectly, even at a dizzying pace.Some laser printers use a strip of light emitting diodes (LEDs) to write the page image, rather than a laser. Each dot position has a dedicated light, which means the printer has been printing a set of resolutions. These systems are cheaper to manufacture than true laser assemblies, but they produce lower results. Typically, you'll only find them in less expensive printers.
 
Basic Toner 
One of the most distinctive thing about the laser printer (or photocopier) is the toner. Toner is electrically charged powder with two main ingredients: pigment and plastic.Function is to provide a pigment colors (black, in a monochrome printer) that fills the text and images. This pigment is blended into plastic particles, so the toner will melt when it passes through the fuser hot. This quality gives toner a number of advantages over liquid ink. Especially, tightly binding the fibers in almost all types of paper, which means the text will not smudge or bleed easily.
 
Printing Toner
The process of printing a printer toner to the electrostatic image on the drum begins by saving toner powder into the hopper, a small container built into a removable casing. Collect printer toner from the hopper with the developer unit. The "developer" is actually a collection of small, magnetic beads are negatively charged. These beads are attached to a rotating metal roller, which moves them through the toner in the toner hopper.Because they are negatively charged, the developer beads collect the positive toner particles as they pass through. Roller then brushes the beads past the drum assembly. Electrostatic image of a stronger negative charge than the developer beads, so the drum attract toner particles away.

The drum then moves over the paper, which has a stronger charge and so seize the toner. After collecting the toner, paper detac immediately dismissed by the corona wire. At this point, the only thing keeping the toner on the page of gravity - if you blow on the page, you will completely lose the picture. Pages must go through the fuser to affix the toner. Fuser rollers are heated by internal quartz tube lamps, so that the plastic in the toner melts as it passes through.

To keep the toner to stick to the fuser rolls, rather than pages, the fuser rolls must be coated with Teflon, the same material that makes nonstick breakfast you do not stick to the bottom of the pan.