The Mechanical Handling and Storing of Material

722 THE MECHANICAL HANDLING OF MATERIAL is carried on a screw and is similar to that on the ordinary platform scale, as the terminal screw moves the balance weight. Avery’s Patent Automatic Conveyor Weigher and Totaliser.—An adaptation of the weighing mechanism of the Hopper Weighing Machine to a conveyor of the band or similar type is shown in the illustrations, Figs. 1036 and 1037. The conveyor passes over the weighing platform, to which two or more of the guide rollers of the conveyor are secured; the length of such platform being dependent Fig 1036. Side View of Avery’s Automatic Conveyor Weigher. upon the type of conveyor employed and the speed of travel. The apparatus, however, is designed to meet all the usual conditions of speed, etc., with conveyors of the belt, tray, or bucket types, and as the mechanism is operated by a chain drive from the conveyor shaft it automatically adapts itself to speed Fig. 1037. End View of Fig. 1036. variations. The platform is connected to the steelyard by the usual levers, and as a counterbalance to the load, a plunger carried upon the steelyard dips into a mercury dashpot. When the steelyard has assumed a position corresponding to the load, it is gripped at its extremity by a spring, which is operated by a cam, driven from the main shaft through bevel wheels. The weight upon the apparatus is represented by the height of the steelyard at its outer extremity, and this is ascertained by a measuring device in the form of a plate shaped to an acute angle and placed at right angles to the steelyard. This plate is pushed out to its full extent at each revolution by a crank, and is brought back to position by a weight suspended from a chain on the one member of a double sprocket, the second member of the sprocket being connected by a chain to the totalling counter, and the weight is registered as soon as the measuring device comes into contact with the steelyard, when the cycle of operations is. complete. INTERMITTENT WEIGHING MACHINES Avery’s Patent Automatic Hopper Weigher and Totaliser (Figs. 1038 and 1039) consists of the Avery patent totalling mechanism attached to weighing, levers which carry a hopper of sufficient capacity to contain the contents of a full grab or skip. The grab or skip discharges directly into a hopper, which is carried upon a rigid framework and supported independently of the machine. This hopper is.