The invention relates to a safety apparatus for controlling operation of functional equipment having movable parts, said apparatus configured to use a camera to view and cause detection of a safety related event in a field of view of the camera. The device is useful in a reverse vending machine (RVM) for receiving, handling, sorting and storing returnable items or objects. The RVM includes an item supporting, rotating, sorting and conveyor unit, an upwardly oriented storage chamber for such items, the safety apparatus to avoid operational hazards, a camera aided detection device for detecting at least one of a bar code on and other characteristics, e.g. contour, of an item, a simplified token system , and a drive system with a releasable power coupling for operating the sorting device and a further storage device.