Added some examples for info only - not suggesting this is the solution as that would be situation dependent.

Hi
Have you read page 66 of the WorkSafe Best Practice Guideline "Safe Use of Machinery"? This details WorkSafe's view on how to guard conveyors, There's also an MBIE Factsheet "Guarding of Conveyors" 2013.

Bottom line is that the rollers will have to be guarded if the belt is not able to be pulled up from the roller. Theory is that if a finger/hand got into the nip point, the belt would ride up and the hand pass underneath with (hopefully) minimal injury. If the belt is under tension or is prevented from riding up, then a more serious injury is likely. Basically it's down to risk assessment and then applying the guarding standards.

As an aside I can't see any emergency stops in the photos. All our conveyors have e-stop cables running the length.

I'm assuming that preventing access to the conveyor area and/or isolating the conveyor before entry isn't a goer?