Hello, we have a Universal 1 press, serial # 28671 (1969) that was converted from being a power drive to manual press by Don K. Black.
Recently, we have noticed that the grippers are not releasing the paper fully at the end of the bed.
The grippers all raise up and open easily at the start of the run when we step on the gripper pedal, but do not release the paper ‘easily’ at the end of the run.
(Images of the gripper pedal in action)
I have taken apart the gripper assembly and lubricated it with graphite. I have also cleaned the cams and greased them.
I also tried adding some lead space to the opener cam and even used tape on the gripper bar to keep the grippers open more, both helped but were not a solution.
(images of the trip lever before and on the opener cam)
I have read the Vanderblog article, ‘Uni 3 – gripper problem at the end of bed’ from September 2, 2022 and it seems like a similar problem.
I was hesitant to make changes to the fulcrum length but it seemed like it might be the cause.
I have looked at the different parts of the press and nothing seems to be bent or worn out and I just wanted to see if anyone had thoughts on what might be the problem, and a possible solution.
I removed the gripper arm and it seemed to be in a good shape and straight.
After adjusting the fulcrum in and out, I decided to take Paul’s advice and took a look at the gripper tips.
The worn gripper tips…
I had 4 replacement grippers from NA Graphics, so I decided to change out the 4 most worn grippers. I lubricated them with graphite and put it all back together. It seems a bit better, but it still seems to be holding onto the paper at the end.