SP20 Roller height changing as carriage travels end-to-end

Hello! I’m having a challenge with our SP20.

When checking / setting the roller height at different points (as the carriage travels from end-to-end), when the press is in ‘Print,’ the roller height changes.

Specifically, when the carriage is closest to the feedboard and moving forward for about 10 – 12 inches, the roller height remains the same. After this point, the rollers raise up high enough that they no longer contact the roller height gauge, and remain high for the remainder of the trip down to the end of the carriage. For the scenario I’m describing, I had the rollers set so there was about 1/8 inch stripe on the gauge (when the carriage was near the feedboard).

• The rollers have been recovered recently.

• The press is outfitted with Fritz Klinke’s Improved Form Roller Block Kit; the roller adjustment screws are staying firmly in place.

• The press is level; both cylinder and bed (side-to-side and end-to-end).

• The impression is even from side-to-side and end-to-end.

• The cylinder bearings do not seem to be out of adjustment.

• The problem does not occur when the press is in ‘Trip.’

I don’t know how long the press has been in this state; I’ve worked in this studio for 4.5 years and 99% of folks have not had problems printing well with the press; we noticed the discrepancy when a user was having difficulty printing a polymer plate with very fine detail.

If anyone has any thoughts or suggestions, I’d be grateful!

Thanks, all!

Nick