GB692549A - Improvements in packaging apparatus for powdery, granular, flaky and other fluent solid materials - Google Patents

Abstract

692,549. Filling-machines. R O S E BROS. (GAINSBOROUGH), Ltd. July 5, 1950 [July 21, 1949], No. 19193/49. Class 94(i) [Also in Groups XVIII and XXVI] In apparatus for delivering measured quantities of powder to containers, in which the powder is fed from a hopper to one or a succession of pockets formed of telescopic parts which are relatively adjustable to vary the quantity measured, the surface of one part which co-operates with an opposed surface of the other part is formed with an annular depression or groove to which air under low pressure, e.g. 5-10 lbs. per square inch, is admitted to minimize or prevent leakage of powder through the working clearance between the surfaces. As shown, powder 11 flows from a supply pipe 12 into a collecting chamber 13 from which it passes through apertures 14 in a rotatable wheel 16 into pockets 17, 18 having pivoted bases 19 which are opened at intervals by cam mechanism to allow powder to fall through discharge chutes 22 into cartons 23 moved into position by a chain conveyer 24. The chamber 13 is arranged in an annular channel 26 in the wheel and forms with the base of the channel an enclosed chamber through which the pockets pass in succession. The wheel 16 carries the upper parts 17 of the pockets and is supported by a series of pillars 27 secured to a chain wheel 28 mounted on a sleeve 29 forming part of the main driving gear. The lower parts 18 are carried by a wheel 33 which is formed with bosses 34 slidable on the pillars 27 and is adjustable vertically by rotation of a shaft 41 which is in threaded engagement with a sleeve 38 supporting a thrust bearing 37. Each part 18 is formed with an annular chamber 42 communicating through a radial conduit 44, conduits 47 and 49 and a central bore 48 of the shaft 41 with a source of low pressure air. A felt sealing ring 43 is arranged in a recess in the chamber and engages the outer periphery of the part 17, the air oozing through the ring being effective to prevent leakage of powder without causing turbulence in the powder in the pocket. Specifications 686,906 and 690,215 are referred to in the Complete and Provisional Specifications respectively.