In operation, each horizontal raking beam moves upwards along the bars and then carries the collected debris across the flat plate to the discharge point.

At the discharge point a wiper blade pushes the debris off the rake teeth onto the discharge chute.

The number of raking beams fitted depends on the solids loading anticipated but normal practice is for a second beam to engage with the bottom of the bars at approximately the time that the preceding beam clears the top of the screening area.

Heavy Duty Machines
This robust heavy duty type of raking machine is a self-contained unit mainly used on coarse screening of sewage or raw water river intake. The bar screen is normally angled at 800 and is designed for operation in channels up to 4rn wide and 15m deep. With bar spaces normally between 10 and 100mm. The screening bars are made up into panels which are bolted to horizontal beams fixed across the channel.

The complete self-contained unit is located on guide angles fixed to the vertical sides of the civil work to enable ease of installation and removal.

Light Duty Machines
This machine is designed for use in smaller channels and where fine screening down to 6mm is required. The machine again is a completely self-contained unit which can be lowered into a channel and is fitted with flexible seals to close the gap between the sides of the machine and the channel walls.