A belt conveyor frame including a supporting surface for an endless conveyor belt, a slot across the surface formed of two parallel faces and at an angle to the direction of proposed belt travel and over which the conveyor belt will move in opposite directions to two pulleys and disposed below and to the sides of the faces. The conveyor belt in passing over the faces, around the pulleys and then over the other face provides an angled discontinuity in the conveying surface of the belt. An interceptor device with diverter plates movably attached to an endless flexible member is mounted in the discontinuity so that the plates can be selectively raised to intercept and deflect an object passing on the conveyor.