we aren’t able to slide the paper into the latches as the cylinder rolls up too close… worried we may have to take it off to repair? Does anyone have any ideas?
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A proof press resource
A proof press resource
we aren’t able to slide the paper into the latches as the cylinder rolls up too close… worried we may have to take it off to repair? Does anyone have any ideas?
After seeing your video via email. I think that the carriage bearings have been misadjusted so that the cylinder bearers do not contact the bed bearers when in trip mode.
See the attached image showing the original position of the bearing eccentrics
Working on this press we did get it back to its correct position. However, the cylinder does not hold that adjustment, and randomly rotates independent of the gear rack.
It looks to me that the cylinder gear is not sufficiently engaging the gear rack, and so is allowed to rotate when it should not. It seems that the rack could be shimmed up slightly further to assure the gears stay engaged.
So my question: Is there any other factor or solution, other than raising the rack? and what is a proper shim for these racks?
I have a video which shows the random rotation but the file is too large to attach here.
The procedure to correct a misaligned impression cylinder within the carriage is called retiming the cylinder. On the No. 4 and other models with sectional racks, one person can do it. (The part numbers are called out in Sheets 107 and 107-A from the No. 4 manual.):