Patent GB-314525-A (GB)
Title: Improvements in automatic feed weighing apparatus
IPC: G01G13/30
Filed: 1929-06-17
Abstract: 314,525. Rumpf, E. June 29, 1928, [Conventiondate]. Automatic - feed weighers. - An electricallyactuated automatic-feed weighing-apparatus comprises a feeding jigger with a circuit including a controlling electromagnet and two switches in series actuated by the scale movement, a second circuit controlled by the electromagnet and including an electromagnet for discharging goods from the scale, a third circuit including a controlling electromagnet with delayed action, with a switch actuated by the discharging of goods from the scale, and a fourth circuit controlled by the delayed action electromagnet and including a controlling electromagnet and switch. The feeding jigger or shoot 14 is hinged for horizontal vibration, upon a plate 16, Fig. 4, adjustable in inclination, without substantially altering the level of the discharge end of the shoot, by means of a knob 21', screw 24, nut 22, links 23 and guide slots 20, 19. The material is supplied to the jigger from a hopper 30 mounted on a movable plate 25 which is adjusted vertically simultaneously with the adjustment of the jigger by a link connection 31 so as to maintain the clearance between the hopper and the jigger substantially unaltered. The hopper may be separately adjusted in height by a slot-and-nut adjustment 33, 34. The jigger is vibrated by means of opposed electromagnets 11, 12, Figs. 1 and 5, whose common core 37 has an angular extension 38, Fig. 4, engaging projections 39 on the jigger. A fork 47 on the core buckles a leaf spring 41 into engagement alternately with two contacts 45, 46, Fig. 5, and thus switches the current alternately from one electromagnet to the other and maintains the vibration until the current is cut off. The balance beam 5 carries at one end a two-part pan 48 which may be opened to drop its charge by means of flanges 56. At the other end, beneath a weights pan 50 is an insulated contact pin 51 co-operating with two contact members 53. The pan is discharged by an electromagnet 10, and the machine is further controlled by a delay-action electromagnet 8 and by two electromagnetic coils 90, 9u operating on a common core 69, the cycle of operations being as follows. Commencing with the parts in the position shown diagrammatically in Fig. 5, and the plugs 80 connected to the electric mains, the coils 8, 90, 11 and 12 are energized and the jigger feeds the material into the scale pan, the circuit including in series the contacts 53, 66. When the weight is completed the weights pan 50 rises and the contacts 53 are opened thus deenergizing the electromagnets 90, 11, 12 and stopping the feed. The core 69 falls and closes the contacts 67, 68 thus energizing the electromagnet 10 and causing its core to raise two levers 57, 58 and open the scale pan to discharge its contents. The rise of the lever 57 opens two contacts 65 and de-energizes the delay-action coil 8 whereupon its core 70 slowly sinks under the retardation of an air or liquid dash-pot 71 and closes contacts 75, 76, the slow movement allowing sufficient time for the scale pan to discharge its load. The closure of the contacts 75, 76 energizes the coil 9u, and its core 69 is raised thus allowing the contacts 67, 68 to open and deenergize the electromagnet 10. The scale pan then closes and the levers 57, 58 and other parts return to the position shown in Fig. 5. To prevent the shock resulting from the closure of the pan from opening the contacts 53, an additional electromagnet may be connected in parallel with the coil 9u and the core of the additional electromagnet may be arranged to act on the balance beam.