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Used to work in a bagel shop. We have a big ass slicer, spinning blade you drop bagels into down a chute.
Every day we turn it off and wipe the chute. I wasn't thinking. Unplugged the machine, scooted it out, and began wiping down the chute inside, brushing down crumbs.
It's a fucking miracle my finger barely grazed the still spinning blade that hadn't come to a stop yet. Immediately recoiled my hand and just got a scratch from it, not that deep.
I was pissed at myself for not realizing the blade was still spinning. That shit could've been so much worse.
That sounds like a work hazard. Shouldn't there be a brake on the blade if the safety is broken?
I'm not sure if that works while the blade is spinning down after being shut off. As I understand it, the tech uses electrical resistance to detect contact with flesh, so if the on/off switch cuts power entirely, it wouldn't be able to detect that. But I have no idea how those are generally wired.
From my time in the factory, if a safety seal was broken (e.g. open a hatch giving access to rotating parts),the whole machine halts.
you are correct though that such safety would require electricity to function.
I did not meant a brake like you have on the table saws that pull away the saw upon skin contact. That shit is expensive
One way to implement something like that would be to have a fail safe break that uses electricity to pull a friction pad away from the blade when the machine turns on. Then when you shut it off, the brake gets applied, slowing the blade quicker than the friction of the bearings would alone. It would probably be safer to do that than to use energy to apply a brake because someone might be used to the blade stopping and get hurt if the power goes out.
So yeah, I agree that there should be something like that, now that I understand what you were referring to.