Patent GB-1074149-A (GB)
Title: Sack-filling equipment
IPC: B65B1/32
Filed: 1964-09-01
Abstract: 1,074,149. Packaging-machines; shoots. GEBRUDER BUHLER. Sept. 1, 1964 [Sept 3, 1963], No. 35828/64. Headings B8C and B8S. [Also in Division G1] A bag filling plant having one or more weighers discharging into filling shoots has hoppers or silos for different grades etc. of material, e.g. flour, to be packaged, each hopper having individual feeding means supplying the weigher or weighers so as to package particular materials in required sequences under automatic control. Means (not detailed) enable the plant to be programmed, e.g. by punched card, for a run involving grade changes and to mark bags automatically to indicate the grade and if desired, weight. Bag supply.-Stacks of bags are carried on a horizontally traversable magazine 23 having compartments 25-28 for two stacks each of two different sizes of bag, Fig. 3. Each stack is urged upwards by piston and cylinder means and the top bag is removed by pivoted suction arms 52 which are carried on a turntable 53. The compartment to supply the arms is selected automatically and the magazine traversed accordingly. Exhaustion of one of a pair of compartments causes traversing to prevent the other of the pair to the arms. The arms rise to the vertical and the turntable pivots 180 degrees to place the bag within a yoke .62 having horizontally movable suction cups 64 which engage it and withdraw to open it out. The yoke then rises vertically to place the bag 31 over a filler outlet 1-4 against which its mouth is clamped by arms 71, 72, Fig. 8. Filling, marking and closing.-Separate shoots or hoppers for the various materials have outlets 111-113, Figs. 8, 10 (latter not shown), each to a screw feeder 101-103. The hoppers have projections (122) to relieve pressure on the outlets and pressure air supply chambers 127, 128 for assisting material flow, air supply being controlled by sensing means 132 responsive to material level. The screw feeders are selected automatically to discharge into a weigh bucket 9, downward movement of which when full causes cessation of feed. The bucket then discharges to one of a series of the outlets 31 carried on an intermittently rotated head 43. The bucket may discharge more than once into a single bag. The filled bag is indexed (anticlockwise, Fig. 3) past a beater arm 151 to settle the contents, to a discharge position where one or more selected colours from ink reservoirs 171-174 is sprayed on to it to indicate the contents. The indexing may be controlled by means sensing the applying of a bag to an outlet 1-4. The bag is then released on to a discharge conveyer 181, Fig. 8, for passage through a vertically adjustable sewing head (not detailed) controlled by photo-electric means to accommodate the various bag heights. Alternative arrangements.-The plant may, when desired, discharge to a bulk carrier, a flexible connection (195) (Fig. 12, not shown) bridging the gap between an outlet 191, Fig. 8, and one of the outlets 1-4. Duplicate feed weighers may be discharged into alternate bags on a turntable (Figs. 13, 14, not shown). Reserve hoppers connected to those having the screw feeders and also having a direct discharge line may be provided (Fig. 15, not shown). Trickle feed screw feeders may supplement those described.