| 摘要 |
An endless conveyor has belt-tensioning means comprising two devices adapted and arranged to sense and signal variations in the tensions in the working and return runs of the belt respectively due to change of load conditions, a drum around which the return run of the belt passes and which is displacable so as to vary the tensions in the belt, speed-variable driving gear adapted to effect said displacement of the drum, and means adapted to effect actuation of said driving gear in response to signals emitted by said devices when said tensions are not at a predetermined ratio, and to effect variation in the speed of said gear, and hence of the displacement of the drum, in accordance with the signal characteristics which vary in accordance with the rate at which tension change in the belt takes place due to variation in load conditions.
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