An Even-Flow or 'rise and fall' conveyor/hopper system creates a holding reservoir so the infeed system does not stop when feeding weighing/packing equipment.
The minimum of drop is created with a conveyor which automatically lowers as crop is tipped into it. As the crop leaves the conveyor it rises to maintain the same minimum of drop for the crop from the box.
Crop sensors control the 'rise and fall' and the stop/start of the belt so a continuous even feed of crop is made to the next part of the handling system.
The Even-Flow 'rise and fall' conveyors come at 1200mm or 1800mm wide.