Desperately seeking a solution to a mystery (Cylinder Jamming)

I have a Vandercook 219. Not sure but I think NS (1957). It prints like a dream, or did until this afternoon.

The rolling cylinder suddenly started to hang up about 3 inches into the forme.  So the first few inches of the forme prints, but then the cylinder meets profound resistance, as if something is lodge in a gear somewhere. I have checked everything I can see easily and can’t figure it out. When I flip the trip switch, it rolls clean to the end of the bed.

Is there some issue with the linkage? The foot lever still lifts the grippers, but I do hear an off click I have never heard before about one half turn into the run, several inches before I hit the forme.

I looked in the Moxon book but the possibilities discussed there seemed to be for other models. (Broken spring, etc).

Any help would be deeply appreciated.

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Paul Moxon, Moderator
Admin
6 years ago

Perhaps there’s are issue with your form. What comprises it? Lead type, polymer on a dedicated base, or a mixed form with wood type? I trust that you know that wood may be significantly higher that 0.918″.

Curious that the bolts were stripped. This may mean that a previous owner had made a repair. A reverse thread screw exactor bit may work. Always a tricky endeavor. Please keep us posted.

Paul Moxon, Moderator
Admin
6 years ago

Yes, by backside of the press, I mean the side opposite the operator’s side.

On models before the SP series, the impression cylinder is automatically in trip mode until is clears the ink drum.

Yes, stepping on the foot pedal does reset to print mode. When the carriage comes to a stop at the open end on the bed the cam follower will clear the front trip wedge and then the impression cylinder will shift into trip mode on the return carriage travel. The click means that the cam follower has cleared the trip wedge which has snapped back in place.

Paul Moxon, Moderator
Admin
6 years ago

Can you roll the carriage, in print mode, to the end of the bed without a form in place?
Inspect the backside of the press and see if the cam follower (small steel wheel) rides up the trip wedge (flipper)? The cylinder doesn’t shift into trip mode if this doesn’t happen. Something in this assembly may be loose and/or grimy. Another possibility is that a carriage bearing may be loose.

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