Rollers stop spinning

Hello, we have an SP-15 used by college students in a typography studio. A problem occurs with the rollers when you move the carriage over the the bed. To start the rollers ink up fine and evenly, but as you begin to turn the carriage handle all of the rollers suddenly stop spinning. They seem to stop spinning regardless of being in trip or print mode.  We have adjusted the roller heights and have given the press a good overall cleaning, but this is the first time we have had this happen and are at a loss with final projects around the corner.   Any suggestions to help would be greatly appreciated!

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Paul Moxon, Moderator
Admin
11 years ago

Woodruff key redux: I worked on an SP15 today which had no allowance for one on the roller core or the gear. Perhaps early instances of this model did used them, but I think instead I’ve misremembered (with Eric’s help ; ) ) They should be present, however, on Universals, 219s, and the SP20s.

Gerald Lange
11 years ago

Yeah, walked into the shop, taking Eric’s suggestion in mind. Spun the gear. It was completely loose on the shaft. A minute later all was well.

Gerald

Paul Moxon, Moderator
Admin
11 years ago

Glad you got it fixed and thanks for letting us know the solution. Eric was the one to call it here. As he pointed out a woodruff key (a semi-circular keyed joint) is also necessary. They can be had in any hardware or big box store. While you’re there, get a couple extra hex keys, 9/64″ is the size needed for the SP-15. I recommend having a single (loose) key dedicated to each SP-15 you have.

Gerald Lange
11 years ago

It’s been a while since your post but a similar thing has happened to a Universal I at an institution I work at. If the press mechanic can resolve this I will post the correction.

Gerald

Eric Holub
Editor
12 years ago

Also check that the gears are not turning loose on the shaft. Sometimes people lose the Woodruff keys that position the gear on the shaft, leaving the setscrew to do all the work. It isn’t enough to do the job.

jhenry
Editor
12 years ago

It might help if you posted a photo somewhere of the press with rollers in place. Are the gears in place on the rollers which engage the roller gear rack, which is the motive source for the rollers when they are off the inking drum?

Check to see that these gears are engaged properly with the rack. Perhaps the rollers were replaced into the press with the gears on the wrong side.

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