Albert Noel
Well-known member
my press has an intermittent problem where it will sometimes not forward sheets through the feeder. i'm not really sure what else to do at this point.
occasionally, while starting a new job it will just refuse to grab and forward a sheet out into the feed table. pickup suckers work fine but when the forwarding suckers cycle they just dont snap onto the sheet.
we've tried replacing the suckers, pulling the whole head apart and blowing out the vacuum lines, pulling out and cleaning the pre-timed valve, all the way back to the vacuum pump where we replaced the filters and the veins.
we are getting plenty of vacuum and the head cycles through the motions but it just refuses to grab. if you idle the press and turn on the vacuum and hold a sheet up to the sucker it snaps on just fine. hell, we have it set so that the suckers are barely above the pile... they nearly drag on the top of the pile and still nothing.
the crazy part is, we can't duplicate the problem. sometimes it happens at the start of a job, sometimes mid-run. happens on all stock types too.
we had an independent technician come and take a look and he's baffled by it also.
his solution -> replace all 4 forwarding sucker blocks. (at a cost of $4500!)
can anyone suggest anything else to try before calling in an official manroland tech or potentially spending $4500 on parts that may or may not fix the problem?
occasionally, while starting a new job it will just refuse to grab and forward a sheet out into the feed table. pickup suckers work fine but when the forwarding suckers cycle they just dont snap onto the sheet.
we've tried replacing the suckers, pulling the whole head apart and blowing out the vacuum lines, pulling out and cleaning the pre-timed valve, all the way back to the vacuum pump where we replaced the filters and the veins.
we are getting plenty of vacuum and the head cycles through the motions but it just refuses to grab. if you idle the press and turn on the vacuum and hold a sheet up to the sucker it snaps on just fine. hell, we have it set so that the suckers are barely above the pile... they nearly drag on the top of the pile and still nothing.
the crazy part is, we can't duplicate the problem. sometimes it happens at the start of a job, sometimes mid-run. happens on all stock types too.
we had an independent technician come and take a look and he's baffled by it also.
his solution -> replace all 4 forwarding sucker blocks. (at a cost of $4500!)
can anyone suggest anything else to try before calling in an official manroland tech or potentially spending $4500 on parts that may or may not fix the problem?
