Trouble Feeding Envelopes

Hi - I have printed some DL size envelopes on my Heidelberg 10 x 15 platen - they pick up and feed on the long edge without any problems. However I have another job to print which I need to run the same envelopes on the short edge (to use the guides on the press). I can’t get these envelopes to pick up at all. I have altered every setting I know of and even disassembled the suction bar, and cleaned all filters. I am running on 3 rubber suckers and the same set up will pick up a sheet of 600gsm board. Any help greatly appreciated.

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I’ve run a lot of #10’s here in the states…not sure what size a DL is but it looks similar. I ran into a similar problem from time to time. Several solutions: Run a shorter stack, say 50-100 at a time. Use a Christmas tree (the tag attachment) if you have it. Good discussion on how to use it here http://www.briarpress.org/30109 near the end of the post. Whittenburg has them-get one. If the envelopes are bent try straightening them so they are flat. Use a wedge in the pile to make your stack flat, but don’t forget its there-pull it out before it slides forward. Open the flaps for the run-which we did regularly, it made the makeready so much easier. One or more of these ideas should work, and you won’t need the rubber suckers.

image: Part - briar 1.JPG

Part - briar 1.JPG

Thanks for that, believe it or not I just turned the envelopes round through 180 degrees and they feed no problem what so ever…
I did try removing the suckers and it wouldn’t feed them. I have attached a jpeg of them feeding and you will see that I have a little sprung loaded feed board which keeps them flat, but turn them round and they won’t go.
Nice to see them flying through now…
Thanks again

image: ENVELOPES.JPG

ENVELOPES.JPG

thats great, so thats gripping along the left edge right reading?

Thats right, unbelievable that it should make any difference - but it does…