| 摘要 |
Apparatus (26, 72) in which lateral movement of a travelling belt (10) is controlled so that the belt (10) moves in a predetermined path. The apparatus includes at least one roller (22) having a plurality of spaced-apart resilient fins (72) extending outwardly from the exterior surface thereof. The portion of the fins (72) contacting the belt (10) passing thereover provides support therefor. Preventing the belt (10) from deviating laterally from the pre-determined path by more than a chosen extent deflects the portion (72a) of the fins (72) in contact with the belt (10). The deflected portions (72a) of the fins (72) return to their normal positions after coming out of contact with the belt. In this manner, the maximum lateral force applied to the edge of the belt (10) by deflection limiting means (26) never exceeds the minimum force required to buckle the belt (10). |
