I've been looking into and learning some secrets of the Cricut's cutting carriage.
First off, it appears to be a custom version of the US Cutter "Refine EcoCut" carriage. See for yourself: http://www.uscutter.com/Refine-EcoCut-Carriage_p_1669.html - the only difference I can see from the photo is there are TWO positions in the tool holder. The manual says the front hole is for the pen attachment, and the rear hole is for the blade attachment.
Regarding cutting pressure, both the Refine manual and in other places, the maximum pressure is claimed to be 400g (or 0.88 lbs). However, a colleague of mine actually tested it and got an indicated 0.4 lbs at +4 vdc. I'm planning to retest this on a running machine (after disconnecting the stepper motors!).
Finally, I originally believed this to be a solenoid, but after taking the carriage apart and checking voltage readings, it was discovered that it's actually a voice coil! Basically just like a speaker without a diaphragm. Normally, a -2vdc current biases the blade upwards, and switches to +4vdc (at maximum pressure) to press the blade downwards.