Patent GB-430985-A (GB)
Title: Improvements in or relating to automatic weighers
IPC: G01G13/00
Filed: 1933-11-28
Abstract: 430,985. Automatic-feed weighers. MAHLKUCH, E., Greifenm³hle, Post Kl³tzow, Pomerania, and HENNEFER MASCHINEN-FABRIK C. REUTHER & REISERT, Hennefon-Sieg, both in Germany. Nov. 28, 1933, No. 33266. [Class 143] [See also Group II] In an automatic weighing-apparatus with a rotating turntable which feeds material in bulk into the weighing receptacle, the turntable is arranged co-axially with and above the receptacle and is started and stopped by mechanism actuated by hinged discharge flaps. Full or dribble feed is given by adjustable sweeps arranged above the turntable. The height of the pile on the turntable may be regulated by a vertically adjustable section of the feed pipe. Means are provided to prevent the escape of dust between the conical discharge hopper and the receptacle. The receptacle 3, Fig. 1, is supported from the ends of double arms 1 and when fully loaded lifts the weights pan 2. When unloaded or partly loaded, upward movement is limited by a lever 18, Figs. 7 and 8, the end of which swings pivoted weight 20 away from the stop 20<a>. The material is fed through the vertically adjustable pipe 9, Fig. 6, on to the turntable 5 which is driven by bevel gearing from a shaft 35 and clutch 46 actuated automatically. Sweeps 22 are adjusted simultaneously by linkwork controlled by vertical movement of the receptacle 3 to give full feed and then, towards the end of the filling operation, a dribble feed, the material being thus discharged over the outer edge of the turntable. In a modification, the material is directed on to the outer periphery of the turntable and is fed therefrom by a central discharge opening. The lower end of the receptacle is closed by hinged counterweighted discharge flaps 12, 13 which close automatically when the material is discharged and are then held closed by toggle links 15, 16 supported by a stop 15<a>. When swinging up to the closed position, cam 54 on one of the flaps operates push rod 57 which disengages the hooked end of lever 38 from a projection on clutch casing 37 and allows the shaft 27 to be rotated through one revolution from the main driving shaft 35. Arm 42 on shaft 27 then rotates shaft 44 sufficiently to engage clutch 46 whereby the turntable 5 is driven. Weight 43 secured to shaft 44 is also lifted and held by a latch lever 52, 53. Arm 28 on shaft 27 also engages lever 29 and lifts weight 26 which then adjusts link 24 to move sweeps 22 to coarse feed position. Weight 26 is loosely mounted on shaft 44 and is held in the raised position by pivoted latch arm 30, 33 engaging lever 26<a> secured to weight 26. When the receptacle is nearly full, it moves downwards and is thus freed from the force exerted by weight 20 through lever 18. During this downward movement stop 32 engages latch lever 30, 33 and releases weight 26 whereby sweeps 22 are moved to the dribble feed position by link 24. When the receptacle is full it moves further downwards whereby latch lever 52, 53 releases weight 43 so that the turntable driving clutch 46 is disconnected. At the same time part 50 on end of arm 47 upsets the toggle 15, 16 and allows the flaps 12, 13 to open thus discharging the material after which the counterweights restore the flaps and the filling and weighing operation is repeated. In a modification, the conical discharge hopper 4 and the turntable rotate together. Arched intercepting surfaces 17, Figs. 1 and 6, serve to prevent the escape of whirling dust. They may be secured to the weighing receptacle or to the conical discharge hopper. Specification 407,607 is referred to.