Setting Rollers

We are trying to set rollers in a SM 74. We have perfect stripes with the bridge roller to the water form roller (3mm) all the way across. When we check the strip to the ink form we get a stripe of 3 mm on drive side and 1/4 inch on the operators side. These are new rollers we are putting in. this is causing scumming and emulsifying problems.

 

what years is the press .there is a adjustment for bridge roller to ink form.

 

It is a 1995 SM74

 

What is the spring adjustment setting like.

 

is there any needs for the rubber rollers? If do, please feel free to contatc us, we are manufacturer of printing rubber rollers more than ten years. Excellent quality with best price for you!

Linazl@yahoo.cn is my mail. Thank you in advance

 

Yeah, have a look at that spring adjustment as suggested, it could restrict it from dropping all the way.

 

we adjusted the spring . set the rollers and got a good stripe on both the water form and ink form. We then turned the press on, idled a couple minutes then rechecked the stripes and it was back to the same. Good stripe on the water form and the ink form 1/4 inch on operators side and 3mm on drive side.

 

Are you sure the thread on the side bracket or roller is not stripped, your thread could be worn and with the vibration when ideling the roller could jump a couple threads.

Aslo double check for play on the roller itself?

Turn the roller around and see what happens...

 

When we started to have this problem we checked threads on the side bracket and checked to see if the bearings on the bridge roller and it checked out fine.. We have never had this problem when putting new rollers in. We always been able to set the rollers and go. The roller company said they oversized the number 4 ink form by .25mm to last longer.

 

Try a diff roller or put an old one back in to see if it will set. This will give you a better idea where the issue is.

 

have you checked the journal box to see if it has been spun, a bad bearing will freeze up and oblong the bearing cup, causing erratic settings.

 

I agree with trying to swop the roller with the old one, if the problem is still there, then you know its not the roller.

Also check the side bracket for signs of wear, you set it in one position, but after, because of worn parts, it now adjusts silghtly to a different position.