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Laser printer fusers

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  • Laser printer fusers

    I've been scrapping some larger laser printers for motors, pulleys, belts, wiring harnesses, and shafts. It's been a good haul. These are well made units and good stuff.

    One thing I have is the fuser assemblies. I'm trying to figure out a use for these, and that is the reason for my posting.

    Recently I acquired two really big ones, about 13 lbs each. These consist of two rollers, usually teflon coated. One has a very powerful quartz heater. The fuser melts the plastic powder on the page to stick the image. The rollers are held in tension by springs.

    I was thinking of a light duty slip roll. The light duty aspect means it isn't worth spending a lot of time on this. Ideally I would add a third roller to the existing assembly. If I totally rebuilt the thing, it would make more sense to do it right with solid rollers, etc.

    Sometimes the rollers are hollow aluminum. Though at 13 lbs, there must be something more in there.

    Here's an example, and I think it is one I have. I haven't torn into it yet.
    Last edited by Glug; 03-23-2014, 12:53 PM.

  • #2
    It would nicer hold up. Even the light slip rolls have solid steel rollers.


    • #3
      I tore one of these down yesterday and took a few photos.

      In summary, the most useful parts are probably the heater lamps, the bearings, and the shafts and gears. Maybe I can find a use for the rollers, but I'm not sure I'll keep them around due to space. If someone wanted to build a gadget for doing some kind of thermal transfers, the intact fuser could be perfect.

      The rollers are hollow tubes and they contain quartz lamp heaters that are approximately 14" long. They look extremely fragile. I could not find their part number on the web, but they are made by Ushio. A similar looking product consumes 1350 watts at 110 volts. I'm not sure if they can just be powered with straight a/c.

      The lamps do not spin with the rollers. These could be useful as heater lamps for a future project, or even as light sources in the right application - possibly where space is really tight. I assume they would need IR filtering, and of course shatter protection. I need to measure their impedance when cold. Given that they operate in a confined space with essentially no ventilation, in what I assume is a continuous duty application, I'd guess they can tolerate heat well.

      The surface of the roller seems like a silicone material and is obviously somewhat heat resistant. It has some give at the surface, but still feels firm. There are some nice rotating contacts on one end of the rollers. I assume those relate to grounding or possibly an electrical charge.

      There are two gear trains. One rotates the rollers, and the other pulls the rollers apart. Two springs provide the pressure.

      The bearings on the rollers were interesting. 30mm/42mm/7mm in size. Light duty, but they have a very large ID for such a small form. Speed rating is surprisingly high, at 15K rpm with grease. Example:


      • #4


        • #5
          I took apart a blueprint copier and it had a 4' version of the lamp. Runs in 220 at something like 2kw. No idea what I will do with that.

          Yes, you can run the lamp off of straight mains, they are just controlled by a triac on the main board.


          • #6
            In free air, the lamps might be able to operate continuously. I used one of the shorter ones as a light and it was fine- but got too hot for me to handle the fixture. Same as a halogen basically, too hot especially unattended.

            Mine had a trough type parabolic reflector behind it, which was built like a heat sink. I had been thinking that since it focused light fairly well into a line source, I'd use it as part of a light show using magnetically activated mirrors to deflect the light.
            I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-


            • #7
              The lamps are somewhat fragile mechanically, as any glass bulb would be. However, they are robust thermally, typically heating the roll surface to 300 deg. C, operating continuously for days, weeks or months non stop. Additionally, you should find one or more thermistors riding on the heat roll, that is the solid roll, that sensed the temp. The roll surfaces are probable Teflon with the soft roll ( pressure roll) containing proprietary material. The contact on the end of the roll was a ground contact to dissipate static. The bearings don't travel at a particular high speed, however the seals and grease are able to withstand the 300 deg. C.
              In their application, their main output is the heat, with light being of no importance. I have seen large fusers of this type output 5500W.