Universal III pedal sticking + carriage stopping

The pedal on the press is sticking, I figured the grippers needed to be cleaned so I took that assembly apart and cleaned it, and the pedal is still sticking.  Not sure what to do!!

In another unrelated note (or maybe it’s related, who knows!), every so often, the carriage just stops for a second or so as it’s traveling down the bed. What could be causing that?

Thanks!  Carmela

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Paul Moxon, Moderator

From your photo (added to your last comment), it appears that the shaft collar above the spring is not contacting the spring. Tightening the collar should provide the tension needed to raise the gripper rod.

Carmela Heintzelman
1 year ago

I’m having the same issues with the grippers not raising when I press the pedal. I have rotated the cam in the past so that there is a new contact spot, but this time it doesn’t help at all. If I put my finger under the bottom of the gripper and push it up by hand it goes up just fine, so it seems to be an issue with the cam. Any other thoughts?
uni.iii_.pedalrod.jpg

Gripper linkage video

Paul Moxon, Moderator
4 years ago

I believe that you have the later, simplified gripper bar. These gripper pins have rounded ends that contact large cams (discs) inside the impression cylinder. The cams and pins can become dented from repeated contact with one another. Rotating one of the cams by hand shifts all of them so that the pins contact a fresh spot. The pins can be Rotated individually.

Your carriage issue may be an electrical problem with a limit switch (microswitch) or possibly poor alignment with the limit cam (the adjustable rail that hangs from the carriage). Video of the far side of the press may help.

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