Abstract: An independently steerable tube stock idler pulley for simplifying tracking adjustments of a belt, wherein the pulley is rotatably mounted on a fixed shaft supported at its ends by such as pillow blocks or the like, with a pair of roller bearings for permitting rotational movement of the pulley relative to the shaft and a pair of steering bushings each mounted within a bearing and keyed to the shaft, the steering bushings each having a bore which is offset and non-concentric relative to the outer diameter of the bushing, one bushing being rotated 180.degree. out of phase relative to the other bushing for inducing an angle into the pulley relative to the axis of rotation and locking mechanism for selectively locking the shaft against rotation, with the angle of the pulley being alterable by loosening the locking mechanism and rotating the shaft following which the locking mechanism is secured.

Abstract: In an annular pulley for driving a belt having a series of spaced openings therein, the improvement comprising, a series of circumferentially-spaced annular openings in the pulley periphery, a series of spherical balls in the openings in the pulley periphery, the balls being retained in the openings only by a press fit and extending protusively outwardly from the pulley at spaced intervals therearound in defining a series of rounded teeth engageable in the spaced openings of the belt.