Simple accumulation rollers
More sophisticated 'travelator' accumulator.
The purpose of an accumulation conveyor is to provide a �stop zone� � usually at the end of the conveyor � where products literally come to a stop. This can be to facilitate packaging or handling, or merely to prevent them falling off the end of the belt and onto the floor !
A short length of gravity roller conveyor makes a simple but effective accumulation zone, as illustrated in the upper picture on the left.Products reach the end of the belt and simply slide to a halt on the roller section.
More sophisticated conveyors can have �accumulation� built into them. One example is the lineshaft driven roller conveyor. In such a system each individual roller is driven by a drive-belt, each of which connects to a communal drive shaft. When a product reaches the end of the conveyor it is stopped by a bar or �wall�. At this point, the weight of the product �jams� the rollers underneath, causing their drive belts to �slip�, and forming a simple clutch. The roller stops turning, and hence the underside of the product is not scoured or scratched.
A more unusual example is shown in the lower picture, and might be used where the products are too light (or too heavy) for a lineshaft driven conveyor. This 'travelator' conveyor has unpowered �freewheeling� rollers. However, the rollers themselves are attached to a drive chain, and move down the conveyor, carrying the products with them. When the product reaches the end of this belt, the rollers simply keep on moving forwards, but �freewheel� underneath the product. The product remains stationary and � once more � is not scratched or scoured.
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