Bob
the Graphtec has a blade holder that swings out over a small groove that allows the blade to pierce the backing
paper without contacting the platen during perf cutting...
It's the cutting of the backing
paper that consumes blades, not where the blade holder might happen to be.
Paper is incredibly abrasive. The blade cuts the
paper, thus the blade, featuring a miniscule edge, is dulled almost instantly.
Even with weapons grade guillotine cutters that feature a cutting edge measured in feet instead of a mere fraction of an inch, blades dull rapidly. I know this because of a misspent youth working in print shops since I was about 10 years old until not all that many years ago. I changed many a blade in guillotine cutters and, take my word for it, it is or at least was, a rather dangerous undertaking and a really good way to cut yourself to the bone and not even realize it until you've bled all over everything. You'd think that a blade 3/8"-1/2" thick, 4"-5" wide, and 3 or so feet long would last until the next ice age. Not so, it was a task that everyone avoided like the plague but still needed to be done after a relatively small number of cuts.