GB181303A - Improvements in and relating to automatic weighing machines - Google Patents

Abstract

181,303. Boulogne, B. Jan. 24, 1921. Automatic-feed weighers.-In an automatic weighing-machine for liquids or granular materials, of the kind in which after each discharge from the weighing-receptacle a residue is left behind, the weigh-beam consists of a bent lever provided with a counterbalance weight for restoring the receptacle to filling position with the requisite residue therein. In the Figure is shown a machine for weighing liquids, the weighing receptacle 1 being arranged to rotate in a counterclockwise direction for the purpose of discharging its contents. In the operation of the machine, the liquid from the supply chamber passes through valves 20, 30 and enters the weighing receptacle 1. The rise of the liquid in the receptacle causes the receptacle to rotate in a clockwise direction until arrested bv contact of a stop 72 against a suspension rod 3. Further filling of the receptacle rocks an intermediate lever 4, 5 through which the receptacle is siispended from the bent weigh-beam 8, 9. The curved end 54 of the intermediate lever is withdrawn from beneath a lever 52 which falls on to a stop 56, whilst the arm 5 of the intermediate lever pushes back and liberates a rod 24 connected by a bell-crank lever 23 to the main valve 20 and to a lever 47 on the lever 52. The main valve 20 then closes under its own weight. When the weight of liquid is completed through the small valve 30, the bent weigh-beam 8, 9 rotates and an arm 57 integral with the beam knocks up and liberates a rod 39 connected to a pivoted catch pan 38 which falls to a position beneath the feed valves. The movement of the catch pan allows a counterweighted lever 33 to fall and push up the valve 30 to stop the feed. Owing to the rotation of the weighbeam 8, 9, a pin 15 on the receptacle 1 engages a fixed guide 16 and causes the receptacle to rotate into the lower position shown in dotted lines and allow the liquid to run out at the nozzles 11, 12, until the receptacle is returned by the counterweight 10. The return movement resets the parts in the position shown in Fig. 1. The arm 57 is connected by a pin 60, loop 62, and lever 63, to a dash-pot 69 for absorbing shock. The pin-and-loop connection 60, 62 leaves the weigh-beam free of the shock-absorbing device in its extreme positions. In a modification, the shock-absorber is coupled direct to the weighbeam arm 9.