V-belt driving device

Claim 1

A driving device for an asymmetric V-belt, said device comprising in combination: a drive shaft and a driven shaft disposed in spaced apart parallel relationship; a sheave having a conical running surface seated on each of said shafts, each of said sheaves being composed of two halves, one half of each sheave being rotatably and axially fixed on the respective shaft, the other half of each sheave being freely rotatably and axially displaceably seated, the facing sides of the sheave halves defining different acute angles relative to the shafts, said angles constituting asymmetric running surfaces for a V-belt, the sheave halves defining the smaller angle relative to the shafts Facing in the same direction, said fixed sheave halves being disposed in planar alignment and said rotatable and axially slidable sheave halves being also disposed in planar alignment; a biasing means for each of the sheaves, each of said biasing means biasing the respective freely rotatable and axially displaceable sheave half toward the respective fixed sheave half; and setting means for each of the sheaves, each of said setting means coacting with the respective biasing means for varying the biasing pressure thereof.