In these incident the Manager over these Supervisors IMO should be fired.I have had supervisors NOT follow conveyer securing. I secured a belt and a supervisor unsecured it. I shrugged it off once.
I yell at everyone that is stupid around these belts, I have been sucked in (was being stupid!), it's not a pleasant feeling.
If you would please share the details of the conveyor accident that you described.
How were you sucked in?