A printer fuser is the part of any laser printer or copier that makes the toner ink stick to the paper. A fuser consists of two heated rollers, and it often is the main culprit in breakdowns. Without it, though, toner ink would constantly smudge and would become illegible after hands touched it.
A laser printer fuser or copier fuser is essential to printing. The ink drum first spreads out the ink into a pattern of a photo, term paper or whatever is being printed. At this point, the ink is very volatile because it simply sits atop the paper and has not yet become one with the sheet. This wet ink immediately goes between both rollers. Thanks to the heat and the pressure from the fuser, the ink is integrated into the paper and will not smudge as easily.
The rollers are why a sheet of paper is warm when it comes out of a printer or copier. The reason printers often require a minute or two to heat up is because they use a quartz tube lamp within each roller to get to the proper temperature. This feature requires the largest amount of electricity in the entire process. The ink is wet and easily smudged when it meets the fuser, so the rollers are covered in Teflon to prevent the ink from sticking to the rollers instead of the paper.
The printer fuser's heat and many moving parts are why it often is responsible for breakdowns. An overheating fuser can be a serious threat to paper because it can scorch each sheet or even melt electrical components within the printer. Each fuser has a thermostat that shuts it down when it reaches a certain high temperature, and this allows the fuser to cool down. Dust and dirt also contribute to fuser breakdowns, but this problem can be fixed by simply cleaning off the rollers with a clean dry rag. Knowing these things can help prevent frustration and expensive repairs.
Without a printer fuser and its two rollers, a freshly printed sheet of paper would be a total mess. Its pressure and heat are the secret to the speed and accuracy of home laser printers and copy machines. This heat and pressure does cause frequent problems, but these problems can be fixed easily with proper care. The toner and its ink create the images we see on sheets, but the printer fuser is the most important component to any printing device.