Abstract: Weighbelt apparatus of the kind described in U.S. Pat. No. 4,509,609 is improved by having the planar support cantilevered to both sides of a central transverse crossbeam which rests on six cantilever arms carrying strain gauges in cutouts. Two calibrating weights can be hung independently off the bottom of the beam when the belt is lifted off the planar support. This configuration avoids spurious reading when the load on the belt is unevenly distributed.

Abstract: A weighbelt is conventionally placed in or associated with a production line for weighing material supplied during production. The weighbelt of the invention has a belt 10 which can be lifted by rollers 18 out of contact with a planar support plate 16 without stopping the belt 10. A known mass 24 is then lowered into a cradle 26 to provide a downward force on the plate 16 to calibrate output signals of a strain gauge 22. The strain gauge 22 provides output signals when the belt is supported by the plate 16 indicative of the material loading on the belt 10. The weighbelt can be calibrated without stopping the belt 10 and disrupting production.