Working Of Laser Printers

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

Using a laser printer has a number of advantages over any other types of printers available. The speed of a laser printer varies from one model to another as it depends on a number of factors like the graphic intensity required in processing the job and others. The latest models of laser printers can print more than 200 single 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 feature 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 transfer 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 overall cost becomes apparent only when the printer requires a drum replacement.

Another feature 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 number of mid-range office laser printers. Although, the duplexing technology can reduce the printing speed to some extent as the paper path length 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 reason being the large amount of data required to output to the printer in a continuous fashion. The printer cannot wait for data arrival 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 single dot that can be printed on a page. However, this requirement of storing the dots in the memory before printing can begin has limited the printing capability 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 entire page line by line and stores a bitmap of the page in the raster memory. The drum is then charged negatively and the bitmap is written on the photosensitive drum using a laser beam whose functionality is dependent on the bitmap image. The charged toner particles are charged 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.

Brother HL-2140 Personal Laser Printer – Affordable, Reliable Quality

If you are looking for a new laser printer and want to find a good quality but affordable monochrome laser printer, you will want to check out the Brother HL-2140. I bought the HL-2140 about six months ago and I’ve been using it regularly since then. I use the printer mainly for archiving documents and for desktop publishing projects. I have put the Brother HL-2140 to the test over these past six months and it has performed reliably and well.

I selected a monochrome laser printer based on my home office printing needs. I have an ink jet printer for those rare occasions when I need a print with color but for my regular daily office tasks I use a black and white (or monochrome) laser printer. I have been using an older HP Laser Jet 4M for the last decade but it recently had a part go bad and it turns out it is cheaper for me to buy a new printer than to repair the old one. So I went shopping online and discovered the Brother HL-2140. After doing some detective work on the printer, I decided to buy it.

The printer was easy to set up and begin using. From sealed package to first test copy, only 30 minutes had elapsed. The instructions and the CD-ROM software were simple and easy to comprehend.

The HL-2140 printer doesn’t take up much desktop area measuring 14.5 x 6.7 x 14.2 inches (W x H x D) and it weighs 15 pounds. It is mostly made of plastic and while it is fairly firm, I would recommend opening the trays and other printer openings carefully as rough handling may result in breaking of some plastic parts. It’s not made for rugged handling.

This Brother laser printer is fast (prints up to 23 pages per minute) and the paper cassette tray holds enough sheets (up to 250) to keep you ready to print at the click of a mouse. I find the laser printer to be much more economical to use than an ink jet and since I don’t need it for color prints, this Brother monochrome laser printer suits my printing needs very well.

The starter toner cartridge seemed to run out of toner quickly but this is par for the course for consumer printers. I found information online on how to extend the toner cartridge’s capacity and now, hundreds of sheets later, I am still using the original starter toner cartridge.

I paid $80 for the printer during a summer promotion. It can be found online for around $100, at the time of this writing.

I am happy with the Brother HL-2140 Laser Printer. Brother is a well-respected company and I have previously owned some of their other products, each of which gave many years of economical, reliable service in my home office. I am equally pleased with the performance of this printer. I recommend it to anyone looking for an affordable, reliable quality monochrome laser printer.

Laser Printers And Inkjet Printers – Advantages And Disadvantages

When choosing a printer the first choice will be whether to buy a laser printer or an inkjet printer. The following summarize the main advantages and disadvantages of inkjet and laser printers.

Inkjet Printers

Inkjet printers works by propelling droplets of ink onto the paper. The ink is released from small removable cartridges and if it is a colour inkjet printer there will normally be a black cartridge and three different coloured cartridges. You can either replace the whole cartridge or refill the cartridges with a special refill kit.

Advantages

  • Inkjet printers are considerably cheaper to buy.
  • High end printers are capable of producing good quality images when used with special paper.
  • Most models are relatively light weight and compact so they don’t take up too much space on the desk.

Disadvantages

  • Due to the cost of ink, running an inkjet printer over time is a more expensive than a laser printer.
  • Prints emerge from the printer slightly wet and may need time to dry.
  • Printing is slower and therefore inkjets aren’t designed for high volume printing.

Laser Printers

This printer incorporates a laser beam as a part of the image processing. Rather than using ink a laser printer uses toner, a dry plastic powder combined with carbon black or colouring agents. The consumable a part of the printer is encased in a cartridge which needs to be replaced from time to time.

Advantages

  • Laser prints are generally very high and very accurate.
  • For high volume printing laser printers are considerably cheaper to run.
  • Printing is fast so they can handle large volumes.
  • Due to the technology used prints from a laser printer emerge from the printer dry to the touch.

Disadvantages

  • Buying a laser printer can be expensive when compared to an inkjet.
  • Colour laser printers are significantly more expensive than a colour inkjet.
  • Laser printers are larger and heavier as they need to contain the imaging drum and laser technology.