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Impact printers, as the very name implies implies that the printing mechanism touches the paper for creating an image. Impact printers were utilized in early 70s and 80s. In Dot Matrix printers a number of small pins can be used to strike on the ribbon coated with ink to transfer the image on the paper.
Other Impact Printers like Character printers are basically computerized typewriters. There is a series of bars or a ball with actual characters in it, which strike on the ink ribbon to transfer the characters on the paper. At a time just one character could be printed. Daisy Wheel printers make use of a plastic or metal wheel. These types of printers have limited usage though since they're restricted to printing only characters or one kind of font and never the graphics.
You will find Line printers in which a chain of characters or pins, print a whole line, which makes them pretty fast, however the print quality isn't so great. Thermal printers aren't anything but printers used in calculators and fax machines and copiers. They're inexpensive to make use of. Thermal printers work by pushing heated pins against special heat sensitive paper.
More efficient and advanced printers came out now which use new Non-impact Technology.
Non-impact printers are the ones in which the printing mechanism does not come into the contact of paper at all. This makes them quieter in operation in comparison to the impact printers.
In mid 1980s Inkjet printers were introduced. These happen to be the most popular and popular printers so far. Colour printing got revolutionized after inkjet printers came to be. An Inkjet printer's head has tiny nozzles, which place extremely minute droplets of ink around the paper to produce a picture. These dots are extremely small that even the diameter of real hair is bigger. These dots are placed precisely and could be up to the resolution of 1440 x 720 per inch. Different combinations of inkjet cartridges can be used as these printers.
How an Printing device works
The print head in this printer scans the page horizontally back and forth and the other motor assembly rolls the paper vertically in strips and therefore a strip is printed at any given time. Only half another is taken to print a strip. Inkjet printers were very popular because of their capability to colour print. Most inkjets use Thermal Technology. Plain copier paper can be used during these printers unlike thermal paper employed for fax machines. Heat can be used to fireplace ink onto the paper through the print head. Some print heads can have as much as 300 nozzles. Heat resistant and water ink can be used of these printers.
The latest and fastest printers are Laser Printers. They use the main of static electricity for printing it as being in photocopiers. The key of static electricity is it could be built on an insulated object. Oppositely charged atoms of objects (good and bad) are attracted to one another and cling together. For instance, bits of nylon material clinging for your body, or even the static you get after brushing hair. A laser printer uses this same principle to glue ink around the paper.
How Laser Printer works:
Unlike the printers before, Laser printers use toner, static electricity as well as heat to produce a picture on the paper. Toner is dry ink. It has colour and plastic particles. The toner passes through the fuser in the computer and the resulting heat binds it to any kind of paper. Printing with laser printers is fast and non-smudge and the quality is excellent due to the high resolution that it can achieve with 300 dots per inch to just about 1200 dpi in the more advanced.
Basic aspects of a laser printer are fuser, photoreceptor drum assembly, developer roller, laser scanning unit, toner hopper, corona wire and a discharge lamp. The laser beam creates a picture around the drum and wherever it hits, it changes the electrical charge like positive or negative. The drum then is rolled around the toner. Toner is acquired by charged area of the drum and gets transferred to the paper after passing with the fuser. Fuser heats up the paper to amalgamate ink and plastic in toner to create an image. Laser printers are known as "page printers" because entire page is used in the drum before printing. Any type of paper can be used during these printers. Laser printers popularized DTP or Desktop Publishing for this can print a variety of fonts and then any graphics..
This is how the pc and printer operate to print
When we wish to print something we just press the command "Print". This information is sent to either RAM from the printer or the RAM from the computer based upon the kind of printer we've. The entire process of printing then starts. While the printing is happening, our computer can continue to execute a variety of operations. Jobs are put in a buffer or perhaps a special area in RAM or Random Access Memory and also the printer pulls them off at its very own pace. We are able to also fall into line our printing jobs this way. By doing this of simultaneously performing functions is called spooling. Our computer and also the printer therefore are in constant communication.