Patent GB-344400-A (GB)
Title: Improvements in or relating to machines for filling material into containers
IPC: B65B1/18
Filed: 1929-08-29
Abstract: 344,400. Packeting powdered materials ; automatic-feed weighers. CORNELL MULTI-WALL VALVE BAG CO., East Pepperell, Massachusetts, U.S.A. Aug. 29, 1929, No. 26350. Convention date, March 20. [Class 143.] A machine for filling material into containers to obtain substantially equal packages of the same material, comprises means adapted to form each package by separating out portions of the desired amount from a supply thereof, each portion being an aliquot part of the desired charge for one package, and means for delivering the requisite number of such parts into each container to aggregate the several parts to form the charge. As embodied in a machine wherein the portions are weighed, a constantlyrotating frame 34, 35, Fig. 1, carries an. annulus of supply hoppers 76 and an equal number of weigh pans 130 delivering to receiving hoppers 230 from which the weighed material is expelled by screw devices to valve bags placed by the operator upon outlet nozzles 238. As the hoppers 76 rotate, they receive in turn a supply of material from a pipe 83, Fig. 14, fitted with a flange 84. A stationary cam 39 engages a bell-crank lever 110 mounted on the rotating frame and couples up a clutch 92 thereby rotating a propeller screw within the hopper 76 and feeding the material through a slot in the underside of a cut-off cylinder 122 whence the material falls into the weigh pan 130. When the requisite weight has entered, the weigh beam 134 tilts and a pair of forks 147 operating through levers 150, slide a pair of escapement bars 154 to the right thereby liberating the cut-off cylinder 122 which then rotates through 180‹ under the driving action of a friction clutch and cuts off the feed. The weigh pan in descending carries down a rod 180 connected to the discharge-gate mechanism of the pan until a lug 182 rocks a lever 183 causing its end 185 to receive a succession of blows from a pin wheel 186 thereby liberating the discharge gate and dumping the weighed charge into a receiving hopper 230 from which the charge is immediately transferred through the nozzle 237 to the valve bag. On the rise of the scale pan the escapement bars 154 permit the cut-off cylinder to rotate through a further 180‹ in readiness for a further weighing operation. During the complete rotation of the machine, each weighing device performs two or more weighing operations in order to supply sufficient material to fill a bag. If the operator is unable to place a bag on the filling nozzle, he disconnects the unit by pulling out a handle 249 thus letting down a dog 253 to prevent engagement of the feed clutch 92 of the unit. If the hopper 76 of a unit has not received a sufficient supply of material from the pipe 83, a shoe 44 resting on the material, assumes a lower position and lets down a cam 47 so that the cam is unable to raise a dog 257. The dog in its lower position prevents the engagement of the feed clutch and renders the unit inoperative. As the bags approach a completely filled condition they pass between a series of vertical jigging plates to settle the contents. When a bag is completely filled, its lower inner corner 303 enters the angular end 294 of a pivoted ejector arm provided with a roller 293 running on a stepped track bar 286. The bag-engaging end of the ejector arm is then driven along the track by a cam and linkage mechanism so as first to ease the pressure of the bag on the nozzle, carry the bag partially off the nozzle and then bring its forward portion on to a conveyer band by which it is removed.