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Why Paper Jams Persist (newyorker.com)

A trivial problem reveals the limits of technology. Fascinating story from The New Yorker: Unsurprisingly, the engineers who specialize in paper jams see them differently. Engineers tend to work in narrow subspecialties, but solving a jam requires knowledge of physics, chemistry, mechanical engineering, computer programming, and interface design. "It's the ultimate challenge," Ruiz said.

"I wouldn't characterize it as annoying," Vicki Warner, who leads a team of printer engineers at Xerox, said of discovering a new kind of paper jam. "I would characterize it as almost exciting." When she graduated from the Rochester Institute of Technology, in 2006, her friends took jobs in trendy fields, such as automotive design. During her interview at Xerox, however, another engineer showed her the inside of a printing press. All Xerox printers look basically the same: a million-dollar printing press is like an office copier, but twenty-four feet long and eight feet high. Warner watched as the heavy, pale-gray double doors swung open to reveal a steampunk wonderland of gears, wheels, conveyor belts, and circuit boards. As in an office copier, green plastic handles offer access to the "paper path" -- the winding route, from "feeder" to "stacker," along which sheets of paper are shocked and soaked, curled and decurled, vacuumed and superheated. "Printers are essentially paper torture chambers," Warner said, smiling behind her glasses. "I thought, This is the coolest thing I've ever seen."

9 of 122 comments (clear)

  1. So why? by Anonymous Coward · · Score: 5, Insightful

    This is Slashdot. The title invites a question, and TFS doesn't answer it.

    1. Re:So why? by PolygamousRanchKid+ · · Score: 4, Funny

      This is Slashdot. The title invites a question, and TFS doesn't answer it.

      That's easy. Paper jams persist because Xerox has a team of engineers to prevent them. The team designs the printer or copier to prevent most paper jams.

      However, they still let it have a few paper jams. If they would design the machine to have no paper jams . . . their skills would not be needed, and they would get fired.

      So paper jams persist to provide job security for those who are paid to prevent them.

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    2. Re: So why? by Applehu+Akbar · · Score: 3, Funny

      My mother, who at 96 still runs a business out of her apartment, insists that computer files are not ârealâ(TM) unless printed out, so she puts more mileage on her low-end laser than the average law office. To save money she re-uses her paper, which is tolerable if you take the trouble to keep your discarded pages in as pristine a state as possible.

      But every so often I get The Call. I have to go over there again and untangle six pages of recycled paper that were put through with a staple left in the corner.

    3. Re:So why? by vtcodger · · Score: 5, Informative

      "I share your concern. This is Slashdot. We can't be expected to, like, read the actual article."

      That's too bad, because it turns out to be a REALLY GOOD article -- informative and very well written.

      The answer turns out to be that paper is awful stuff. Its properties aren't uniform and vary with supplier and climate. And printers are trying to move the stuff precisely and quickly.

      --
      You can't see ANYTHING from a car, You've got to get out of the goddamned contraption and walk...Edward Abbey
    4. Re:So why? by zeugma-amp · · Score: 4, Interesting

      I agree with you. It is a well written, and interesting article. The nerdiness factor is high enough that it's definitely /. fodder. In it, I found my word of the day...

      At a hip Rochester restaurant called Nosh, Viavattine held the menu up to the light to assess its "flocculation" (the degree to which its fibres had clumped infelicitously together).

      Flocculation... just kinda rolls right off the tongue. Most excellent!

      --
      This is an ex-parrot!
  2. In my personal experience by taustin · · Score: 4, Interesting

    which is probably not representative, paper jams persist because my employer buys the cheapest paper they can find. The kind that clumps and sticks to itself, that sheds paper dust like it's snowing, that has uneven edges, etc.

    1. Re:In my personal experience by XxtraLarGe · · Score: 3, Informative

      which is probably not representative, paper jams persist because my employer buys the cheapest paper they can find. The kind that clumps and sticks to itself, that sheds paper dust like it's snowing, that has uneven edges, etc.

      In a former life, I was a "key-operator" at a local Kinko's. Paper quality is just one of several factors. There's also the way you load it into the printer. Paper has a natural curl from being cut from rolls. IIRC, the curl is downward, so if you load paper from a ream, make sure to put the paper in the same orientation you got it out of the ream. Don't flip it. Then there's also humidity. It's a huge culprit. If it's too low, the sheets will cling together due to static electricity. If it's too high, the sheets will cling together because they're damp.Other reasons that exist are dirty fusers, worn or dirty rollers, bad toner cartridges, etc.

      --
      Taking guns away from the 99% gives the 1% 100% of the power.
    2. Re:In my personal experience by jellomizer · · Score: 5, Informative

      Having done printer repair, I am not proud of it but I needed the money.
      However the most common causes are the following.
      1. Worn out feet: Those rubber wheels that pull up the paper, get warn out over time and has a hard time grabbing the paper, when it does it is past the timeout period on the sensor.
      2. Warn out fuser: The fuser is a heated roller they have a plastic/silicon covering on it, to prevent burning the paper. over time with heating and cooling the covering gets warped so the paper will not always fit in.
      3. Bad Paper: Cheap paper that just sticks and doesn't flow properly.
      4. A previous jam: There was a jam previously that wasn't as cleared out as people expected.
      5. Bad ink (for solid ink printers): Cheap ink has a slightly different melting and cooling point then devices specification, causing ink to gum up the pathway.
      6. Bad solenoid: over time they get sluggish or stuck.
      7. Warn out gear. Those plastic gear if handing paper a bit too much for them ware out.
      8. Blocked or malfunctioning sensor: a bad sensor says there is a problem when there isn't really anything.
      9. Non-Paper blockage: Staples, Paperclips, bubble gum, rodents, bugs, hair, fingernails... causes blockage.
      10. Abuse: Just smacking bending parts breaking pins....

      Most of the Jamming problems can be fixed with regular maintenance. As unlike other computers moving parts (such as a hard drive, or DVD or floppy drives) there is a lot of torque and energy evolved with a lot of parts exposed to the elements.

      --
      If something is so important that you feel the need to post it on the internet... It probably isn't that important.
  3. Re:Photocopiers are a marvel of engineering IMHO. by CastrTroy · · Score: 3, Informative

    Yeah, I recall thing being much worse when I was dealing with tractor fed dot matrix printers and early inkjets. I have a $50 laser printer from Walmart that is about 5 years old, and it very rarely gets paper jams. Usually only when the paper isn't in good condition or if you try to print double sided and run the same page through twice.

    --

    Anthropic principle: We see the universe the way it is because if it were different we would not be here to see it.