No. 4 rear roller will not rotate

After much successful use, I had to move my Vandercook 4 proof press. In putting everything back where it is supposed to be, I have encountered a problem (actually several problems, but I fixed the sheared drift pin on the gripper foot lever as well as the sticking and bent grippers). After much scouring, I didn’t see a reference to the newest problem. The form roller that makes contact with the ink drum will not move. When the ink drum is rotating, the roller makes contact, but stays stationary. Thus, no ink can be distributed. I am not sure if this is a consequence of my having removed the cylinder to make the press lighter for moving. Is it possible that I did not index the cylinder properly, so that he gear teeth are misaligned? In general, the press does not look out of alignment, but I could be one or even two teeth off without knowing it. The other possible culprit seems to be the clutch assembly. I had problems inserting the bottom frame form rollers, they did not want to seat properly. The roller clutch trip was engaged, and in the way. I cranked the press a bit, the clutch disengaged and the frame dropped into place, but still no movement as it contacted the ink drum.

Any suggestions would be gratefully accepted, I want to get printing again soon.

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Paul Moxon, Moderator
13 years ago

When the gear and clutch block wont separate it is likely the the clutch pins (MR-110) are worn flat and need to be replaced. The pins may also have dimpled the clutch plate.

Eric Holub
Editor
13 years ago

When inserting the lower roller frame at the feedboard, you have to dip the right-hand side and come in at an angle so that the clutch pins don’t sit on top of the clutch plate. The lower frame must be seated correctly.
If both of the clutch blocks are completely separated, and the rear roller is actually in contact with the drum, then the rollers should turn. Take off the upper roller frame and see if anything changes (if the rear roller starts to turn then, a stuck front roller may be retarding motion). Lift the form rollers with the handle and make sure thay are completely free-spinning. Test with paper feelers that you actually have contact with the drum. If you need Nyliners and don’t have them, that could also affect roller contact.

Paul Moxon, Moderator
13 years ago

The index of the impression cylinder in the carriage is unlikely to affect the contact between the form roller and the ink drum. More likely, the rollers need minute adjustment. They may also be undersized, the diameter should be 2.5″.

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