The Digitisation Line includes conveyors driven by powerful electrical motors. Any particles that might land in their gears will be sucked in. Therefore, anybody coming closer than 2 meters to the line must not wear any strong wraps. This includes ties, scarfs, key hangers, meeting name tags, etc. There are warning signs posted on the wall about this.
The line operators will visually inspect all visitors, point them to the warning signs, explaining the potential dangers, and see that these instructions will be obeyed to. If not so, the line operator will stop the system immediately, until the normal order is restored.
Any visitors coming closer than 2 meters of the line must be advised of the available emergency buttons, and be told not to hesitate hitting them if there is any sign of trouble.