I'm not sure about other offset printing processes, but with our press, we use take-off bars, or perhaps some refer to them as run-off bars. I've never used them on a sheetfed press, but on our web ...
Obviously, the safest way to remove a hickey from an offset printing press is to shut down, scrape it off the plate, and start up again. Some offset presses have the luxury of having an "automatic ...