So long as lift force does not exceed the belt line drag, no brake is required.

This assumes the belt is not so long in length that elastic stretch and its dynamics need not be considered. This later condition would only need be studied during an aborted start, if sufficiently large strain could be stored during the starting cycle such as with long length and high lift. ■

If the tripper is big enough to warrant a consideration of parking brake requirements it will usually be towed by a machine which should have a lot of brakes fitted. Otherwise it is usually left to the braked motor on the tripper LT drive. ■

Just for interest, are any trippers supplied these days where the drive is taken from the conveyor belt through one of the rollers? ■