SP20 Issue After Print

Hi all,

I’m working with an SP20 and after I run through a print to the end of the bed and roll back to the feed board I hit some resistance about 6 inches before returning the cylinder the entire way back. Here is a video: IMG_0760

I’ve checked the screws and bolts I can see but cannot figure out what is causing the issue. Any help is appreciated!

Thank you,


3 thoughts on “SP20 Issue After Print

  1. Paul Moxon, Moderator - October 3, 2021

    No apologies needed. I’m sure someone else will have the same issue. Documenting problems is what this forum is all about.

  2. illuminated.press - October 3, 2021

    I first tried oiling the areas around the cylinder eccentrics and the bearings and areas around the trip assembly and the problem seems to be solved. After a couple of prints it’s running really smooth. Apologies this was such an amateur error, but thank you so much!

  3. Paul Moxon, Moderator - October 3, 2021

    Try shifting the print/trip lever to trip then continue on to the feed board.
    There are a few different causes for this:
    -lack of oiling can make the cylinder eccentrics not shift easily
    – trip plungers on the side of the bed next to the ink drum gunked up, see sheet 244-A
    – trip roller is missing
    – trip spring is broken, the serial number determines whether leaf or coil spring is used.
    Does the impression cylinder look to be at an angle in the carriage?

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