- The spine on paperback books is not very solid. It twists a lot.
- The spine is nevertheless tight.
- The margins on the textblock sometimes go deep into the spine.
Then I remembered that some other folks here had built scanners with inverted platens, like this one built by ahmad, and I realized that this would be ideal for paperbacks that don't have a lot of value. I can press the spine onto the platen as hard as I need to. I can hold the spine down evenly so that it doesn't twist. And paperbacks are light, so lifting the book, flipping a page, and putting it down again would take less effort than to lift the platen.
And so, I am now setting out to build an inverted platen scanner, with two cameras.
The first thing I did was to (horror!) remove the platen from my existing scanner, flip it over, and pop a book on it.
This platen was originally made from two picture frames. I'm thinking of going out and finding some 1/8" panes of glass, because the picture frames are made of two 1/16" panes each. I think 1/16" is too flimsy for pressing down on, and I've noticed that dust tends to get in between the two panes of the platen where it's impossible to clean unless I take the platen apart.
So... more as I continue.