Patent GB-190808728-A (GB)
Title: Process and Device for Weighing various kinds of Material
Inventor: POPOW WLADIMIR
Filed: 1908-04-21
Granted: 1908-07-30
Abstract: 8728. Popow, W. April 21. Automatic-feed weighers; electric weighing-appatus; liquid-weighers.-Relates to apparatus for automatically weighing fine, coarse, fibrous, or liquid material, and consists in feeding the material intermittently to the pan in portions of varying weight, the loading and discharging being wholly performed by mechanical energy, while the control of the various parts of the mechanism during the weighing is effected by electricity. The material, in this case granular, is fed from a hopper 5 to the pan 20, Fig. 1<a>, through grooved or partitioned cylinderd 8, 9, 7, 6 mounted on shafts 12, 13, 14, 15 which are stopped one after the other during the feeding, by the disengagement of clutches 48<a>, 48<b>, 48<c>, 48<d>, Fig. 2. The method of disengagement is shown in Fig. 3<a>, where the clutch 48<c>, 49<c>, driven by gearing from the main shaft 11, is put into operation when the lever 52<c> is pressed behind a catch on an armature 54<c> by an intermittently-rotated cam 66<c>. When the armature 54<c> is attracted, the lever 52<c> is released, and the clutch is rendered inoperative. The remaining clutches are similarly operated, in connexion with electro-magnets 53<a>, 53<b>, 53d, Fig. 2. The beam 3, Fig. 1<a>, supported on knife-edges 24, has at one end a projection 25 with three horizontal pins, beneath which are arranged three balanced levers 29, 30, 31, which at the commencement of the feed are held by the pins clear of contact-pieces 37, 38, 39. As the pan sinks, the lever 29 touches the contact 37, and this completes the circuit of the electromagnet which, as previously described, stops the cylinder 8. Later, the levers 30, 31 make contact, and the cylinders 9, 7 are in turn arrested. Finally, when the beam is in equilibrium, a contact 43 completes the circuit of the electro-magnet 53<a>, and the last feed-cylinder 6 is arrested. At the same time, a double contact switch operated by a spring directs the current through an electro-magnet 62, Figs. 2 and 3<a>, which by attracting its armature couples a toothed segment 57 with a continuously rotating wheel 46. The toothed segment is mounted on a shaft which operates the cams 66<c> &c. through bevel-gearing to re-engage the clutches, and also, by gearing with a second segment 67, raises a crank-pin 70, Fig. 1<a>, to tilt the pan and discharge the contents. The whole operation is thereupon repeated. For weighing coarser material, such as tea, groats, &c., the radial arms of the feed-cylinders do not extend to the partition walls, and in some cases a sector-shaped screen operated by the toothed sectors 57, 67 is used to close the hopper bottom after stoppage of the feed-cylinders and prevent granular material from falling into the scale-pan When fibrous material is being weighed, the sector-shaped screen may be such as a knife, and needle or fork cylinders are used. In a modified scale in which the pan is suspended from the beam, two feed-cylinders are used, and one contactlever acting in a manner similar to the levers 29 &c., Fig. 1<a>, is arranged vertically within a transparent pillar supporting the beam. The pan may be arranged to tilt in a similar manner to that previously described, or a number of pans may be arranged on a rotating plate so that, after each pan has received its charge, it may be replaced by an empty one. When liquid is being weighed, the feed cylinders are replaced by scoops.