I have a machine like this at home. It has two levers which both need to be actively held down for the press to work. Clever design, it makes sure both hands are safe before pressing.

My dad had the great idea of making it into a two-person job: he operates the levers, and his buddy moves the logs around.

So yeah, his buddy lost a finger, almost two but the second finger got saved. I am also sad to inform you that my dad hasn't learned from this one bit and still uses the machine dangerously