New trucks

i have used 18 pt. rule for roller bearers, lock them up on each side of the chase, make sure they run from the top to bottom of chase, this should make your rollers turn, also the grippers should be adjusted to clear these. good luck

Roller bearers may work and some people use them all the time but are generally designed only for certain circumstances. One such use is when printing small forms on a larger press they can provide more even inking by distributing the roller contact. However, they shouldn’t be necessary for the press to work properly unless there is something specifically wrong with the press that can’t be fixed. I think you should check a few more things and try and get to the root cause of the problem.

For example, usually the trucks are keyed to the roller cores to insure that they turn together. Even if they are keyed, there may be oil or some other substance on the rails and/or trucks that is causing the trucks to slide over the rails instead of turn. If the rollers are set too low they may be hitting the form which then prevents them from turning and they are dragged across it. It could be a combination of these problems.

I understand that Kelsey did not key their trucks to the cores but had clips that did the same thing in some cases. I don’t know enough about Goldings or Pearls to know if they should be keyed or not, but clearly that is a preferable setup to help insure that the rollers turn. Where trucks and/or roller cores have not been keyed for some reason, some people have set screws machined into their trucks to keep them fixed to the cores, a relatively simple and inexpensive option.

You don’t mention in what way taping the rails is not working. As you probably know, the purpose of taping the rails is to bring the rollers to the correct height, generally 1/32” below type high (.918). This may require a bit more tape on one side than the other but the idea is to build it up as equally as possible, layer by layer, until the correct roller height is achieved. Of course, in instances where the rails are manufactured type high and the trucks are slightly smaller than the rollers (to allow for that approx. 1/32”) no tape would likely be needed.

I would check all of these things and perhaps a few more before resorting to bearers. They may be of some help in the end, or at least on certain jobs in the future and I have some myself. But it would be better to resolve the actual problem if possible.

Rich

Front Room Press
Milford, NJ
http://frontroompress.com
http://frontroompress.blogspot.com

rich is right, if your trucks are not keyed to the rollers it would cause this problem. another thing to try is taping the trucks, it might work at least its cheaper than new ones. so many things can cause this problem. good luck.

Make sure your roller shafts turn easily in the saddles that hold them. There may be some burrs or something which were worn into the old roller shafts, but not your new ones. also make sure you have added lubrication to the saddles.