Nothing.. This is the major problem of all automatic page turners. A method that minimizes this effect is blowing an air blast at the edge of the page block. This will probably separate pages that stick together. During this you have to prevent that some pages are turned by the air alone. I would mount the air nozzles at the platen. Then i would rise the platen a small amount from the book, blast the air, wait a moment to let the pages settle and than rise the platen fully.StevePoling wrote: In the video, pages are turned from right to left, and I wonder about two things:
1) what prevents two pages on the right from sticking together and being flipped simultaneously?
A better way would be to fix the top page with a slight vacuum to the platen and the to rise the platen a little bit. If you now direct an air blast at the page edge the other pages should be moved down at the page block again. This would require either a scissor movement of the platen or a vacuum that is large enough to lift the page but low enough to still allow it to slide down on the platen. Otherways you would tear the page apart..
For lose bound books gravity. But if there is tension in the spine from the binding of the book this or something equally evil may actually happen.2) After the page is turned, what prevents additional pages from falling over from right to left before the platen can be lowered?
A possible solution would be a second little finger that turns in the opposite direction. The big finger separates the pages a bit. Than the second little finger is turned in fixing the rest of the page block. Then the original finger turns the page. It may be difficult when the second finger only turns on an axis. Ideally it would move inward and than turn to fix the page block.
Another option would a double finger that opens like a scissor. Move this finger inward until it is in the gap that is produced by the movement of the big finger. Then open it. Lower the platen while the finger is still between the pages. Then close the scissor fingers and remove them from the book. finally lower the platen fully.
Another failure mechanism with such books would be that the already turned pages would flip back when you rise the platen. This would require further fingers that retain the page blocks on both sides when the platen rises. This would only work if this fingers fit in gaps in the platen because the edges of this books would follow the platen while it rises and you could not insert an external finger between book and platen.
A page turner with no errors will not be easy to build. But something that works with the major part of the books may be achievable .
Klaus Leiss