Working Of Laser Printers

Laser Printers are generally used printers that are known for its rapid printing abilities. The other marked highlight of a laser printer is the high ability text and graphics printing. It works basically on the principle of xerographic printing process. However, it is dissimilar from the analog photocopying machines in which the image produced is the effect of direct scan of a laser beam on the photoreceptor of the printer.

Hand Held Credit Card Machine

Using a laser printer has a amount of advantages over any other types of printers available. The speed of a laser printer varies from one model to an additional one as it depends on a amount of factors like the illustrated intensity required in processing the job and others. The most recent models of laser printers can print more than 200 particular color pages in one minute, which is more than 12 thousand pages in an hour! The color laser printers are relatively slower, but even they can print at more than 100 pages per minute. The high speed laser printers are generally used for printing of mass mailings like utility or credit card bills etc.

The cost incurred in using the laser printing technology is dependent on more than one highlight such as the cost of the toner, paper, once in a while replacement of the drum, and change required in other consumable parts of the printer like replacement assembly and the fuser assembly. Laser printers having drums made of soft plastic can be costlier in the long run than one can comprehend; its high total cost becomes apparent only when the printer requires a drum replacement.

Another highlight in the family of laser printers is the duplexing model. This allows printing on both sides of a paper without the need to remove the paper at all. This technology can cut paper cost directly into half and also lessen the filling volumes. Formerly, the duplexing technology was available only on the high-end laser printers. However, now they can be seen on a amount of mid-range office laser printers. Although, the duplexing technology can reduce the printing speed to some extent as the paper path distance increases.

The dot-matrix and inkjet printers take the incoming spooled data for the printer and directly print that on the paper making it a slow process which can stop as soon as the printer is waiting for more data. On the other hand, a laser printer cannot work this way, the presume being the large amount of data required to production to the printer in a continuous fashion. The printer cannot wait for data advent and if that happens, there can be gaps and misalignment on the page.

To take care of the above problem, a printer buffer is used. The data is built up and kept in the large printer buffer that is generally present in the printer. This data bank is large enough to account for every particular dot that can be printed on a page. However, this requirement of storing the dots in the memory before printing can begin has petite the printing ability of laser printers to small size like A4 or A3. Most laser printer cannot print long banners as there is no memory to hold that amount of data.

The printing takes place in seven steps. A Raster Image Processor scans the whole page line by line and market a bitmap of the page in the raster memory. The drum is then expensed negatively and the bitmap is written on the photosensitive drum using a laser beam whose functionality is dependent on the bitmap image. The expensed toner particles are expensed negatively and wherever the laser has not discharged the drum, the charges will repel and printing won`t take place, hence creating the required print out. The toner contains a plastic powder that is attracted to the parts where the laser beam hit and in the end the plastic powder is fused at 200 degree Celsius to bond the ink with the paper.

Working Of Laser Printers
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