Arrangement for protecting a belt

A shield arrangement for a power transmitting belt of a drive including a belt pulley having an axis and arranged at a driven side of the drive, the arrangement comprising a cover element arranged to at least partially surround said belt pulley, said cover element having a lower portion and including a pair of half shells having a substantially U-shaped cross section and interconnected by a hinge, mounting means attached to said cover element for mounting said cover element in fixed relation to said axis, a hood element arranged on said cover element and adjustable relative to the latter in a direction normal to the axis of the belt pulley, and a belt falling off preventing means comprising a strip-shaped member having first and second ends and extending in the interior of said cover element substantially in the circumferential direction of the belt pulley, said first end being connected to a swinging arm which is supported at the lower portion of said cover element for rotation about an axis parallel to the axis of the belt pulley and which is adapted to be fixed in a selected rotary position relative to said cover element, to thereby allow adjustment of said second end in a substantially radial direction with respect to the axis of the belt pulley for accommodating various pulley sizes.