I just replaced the rollers on my SP-15 and am having trouble printing the first time out. The rollers were purchased from another press owner, but were new and unused, still in original NA Graphics packing and boxes. This was the first time I’d changed the rollers but didn’t encounter any difficulties with changing over the bearing blocks, gear, etc. I’m using a boxcar base and photopolymer plate which I’ve printed from successfully before. The problems I’m having are–
a. The image has a fine darker line of ink around most of the outer edges. I’ve tried 3 different paper stocks and all show the same problem.
b.The front roller has a consistent pattern of blotchy, darker areas of ink, looks sort of like skid marks. The back roller looks normal.
c. After I adjust the rollers to proper height and run just one or two impressions, then recheck roller height, both rollers have shifted. Usually back roller moving up and front roller moving down, both consistent from side to side. I’ve made sure the screws on the blocks are made tight with allen wrench each time.
I never encountered this particular problem with the old rollers. All the oscillation and roller movements look normal to me, but apparently something is off. Any ideas would be most appreciated, thank you!