Patent GB-360929-A (GB)
Title: Improvements in wafer filling machines
IPC: A61J3/07
Filed: 1930-06-05
Abstract: 360,929. Automatic-feed weighers. WILLMANN, G., 202, Rue de Tolbiac, Paris. June 5, 1930, No. 17406. Convention date, June 5, 1929. [Class 143.] A machine for closing and sealing wafer capsules comprises a hopper 1, delivering powder into a wafer half carried by a balance 33, Fig. 1, which, on attaining equilibrium, electromagnetically closes the outlet from the hopper. The upper and lower half-capsules are carried by recesses 20 and bosses 21 on discs 15, 16 respectively which rotate intermittently in opposite directions. A smaller disc 24 formed with sockets 25, which is given successively an axial movement and a quarter turn in the same direction as the disc 16 carrying the upper half-capsules, serves successively to take up an upper half-capsule from the disc 16, to bring it into contact with a moistener 48, to bring the moistened upper half on to a previously filled lower half, and to carry the thus completed capsule to an ejector. The hopper is mounted between brackets 11, 12 and has secured to it a bridge 2 carrying a bearing for a shaft 4, Fig. 3, driven by variable-speed friction gearing 5, 7, and fitted with a, scraping device 8 and, at its lower end, with an adjustable spindle valve 9 controlling the outlet 10. The hopper delivers powder to a lower half-capsule which is raised from its socket in the disc 15 by the end of a beam 38 of the balance 33. The free end of the other beam 36 of the balance carries an appropriate weight and when equilibrium is attained the balance, at contacts 39, 40, closes an electric circuit to energize an electromagnet 41 which causes a spring-controlled pivoted plate 43 to close the outlet 10 from the hopper. The balance is locked in position by means of a lever 44, Fig. 2, pivoted to a rod 44a which is normally pressed downwards by a spring 45 but is periodically moved upwards by a cam 31a on an oscillating disc 32. The disc 32 is driven by a crank and connecting- rod 54a, 54 and carries, in addition to the cam 31a, a cam 31 which controls the axial movement of the disc 24, and a cam 631 which serves to depress periodically a rod 62 carrying a member 64 to which an ejector disc 65 is secured. The machine as a whole is driven from a pulley 50 keyed to a shaft 51 formed with a worm 53 driving a wheel 52. The shaft 51 is in two parts connected by friction discs 72 normally pressed together by a spring 73 but adapted to be separated to stop the machine if the electromagnet 41 fails to be energized. This action is obtained by means of a cranked lever 71, Fig. 3, operated by a second electromagnet 70, the circuit of which is periodically closed by a switch 69 on the shaft of the wheel 62. This circuit is however broken by a switch 75, Fig. 1, when the first electromagnet 41 operates normally. The wheel 52 drives the cam disc 32 as above described, and, by means of a connecting-rod 55, operates a pawl-andratchet mechanism 57 which gives the discs 15, 16, 24 the required intermittent rotary motion through gear wheels. The moistening appliance, Fig. 6, consists of a water container having a sliding portion 47 pressed upwardly by a spring 49 and carrying a wick 48.