Patent GB-368153-A (GB)
Title: Improvements in or relating to making, filling and closing bags
IPC: B65B51/04
Filed: 1931-05-26
Abstract: 368,153. Filling and closing paper bags. GANGLER, P., 53, Panoramastrasse, Esslingen - on - Neckar, Wurtemberg, and HESSER MASCHINENFABRIK - AKT.- GES., F., 99, Olgastrasse, Cannstatt, both in Germany. May 26, 1931, No. 15352. [Classes 94 (i) and 94 (ii).] In closing a filled bag, a continuous metal band is guided intermittently thereto along the upper edge of a flap of the empty end portion thereof until the front end of the band projects beyond the bag, the band is riveted, stapled &c. to the flap and cut off in front of the bag, the flap and its corresponding opposite flap are laid together whilst the other two flaps are folded in between them, the empty portion is folded down and the ends of the metal band are turned over to secure the bag. A machine is provided for forming, filling and closing the bag. The machine makes a bag lining from a roll of paper, forms a bag around the lining and thereafter supplies to the bag a strip of metal, securing it to a side thereof, adjacent the bag mouth, by punching tongues from the strip and clinching them through the bag material. After a measured charge has been inserted in the bag, the shorter sides are folded inwards and the longer sides collapsed flat thereon, the folded portion being then pressed down prior to its being rolled about the strip to secure the folds which are finally locked in the closed position by bending over the ends of the strip. Bag-making mechanism. Paper lining drawn from a roll R, Fig. 2, and gummed along one edge is severed into blanks and each blank fed by rollers to a mandrel on an intermittently rotating mandrel wheel 901, at station I. A folding box 904a rises to form three sides of the blank and horizontal folders form the bag tube. The end folds are made at station II and during the passage of the bag to station III where a blank for the outer bag is supplied and similarly formed into a bag. The completed bag is pressed at stations V and VI. At this latter station, hooks enter channels in the sides of the mandrel and eject the bag, at station VII, on to an inclined plate mounted on a pivoted arm which raises the bag to a vertical position for filling and deposits it on to one of twelve holders 602 on an intermittently moving conveyer wheel 601 of the filling and closing mechanism. Strip supplying and attaching mechanism.- The wheel transfers the bag to station III of the wheel 601 where the metal strip is supplied and affixed. Feed rollers 41, 42, Fig. 4, draw or push forward a metal strip 40 along a support 700 and between adjustable rollers of which one, 44, is adjustable during the operation of the machine to tension or stretch the strip. The shafts 55, 47 of the feed rollers 41, 42 are geared together and the shaft 55 is mounted in an eccentric bush to permit of its being moved aside for the insertion of the strip. The shafts are driven by a shaft 51 on which is a ratchet wheel 60 rotated intermittently by a pawl 61. Arms 63, 63<1>, Fig. 10, pivoted on the hub 64 of the ratchet wheel 60 support the pawl 61 which is connected to a cam-operated rod 65, to actuate it. The strip passes in front of but beneath three punches 80, Fig. 4, mounted in a carrier block 82 which is secured to a slide 84. The end of the slide 84 is connected by toggle levers 87, 89 to a fixed support disposed in an arm 125 of a supporting member adapted to be lowered to bring the punches opposite the strip, and is reciprocated when an arm 92 pivoted to the levers is moved by an arm 94 fixed to a tube 95 adapted to be oscillated by cam mechanism. This movement causes the punches to cut out from the strip tongues which are thrust through the bag and clinched thereover, the punches operating against a die 81 which frees the bag and strip from them on the return stroke. During the forward movement of the punches, the required length of strip is cut from the stock by knives 115, 116. The supporting member is now raised to allow presser bars below the punches and die to press the joints. The action of the strip feed motion is dependent on the presence of a bag at this station, the ba thrusting aside a feeler 140 connected to and adapted to rock a shaft 145, Fig. 10, carrying at its upper end a bow 146 which lies adjacent to and normally in a plane parallel to the ratchet wheel 60. The pawl 61 carries an offset roller 147 adapted to ride on the bow 146 in its normal position and thus prevent the pawl from engaging the ratchet wheel 60, but when the feeler is actuated, the bow is turned aside and the pawl engages the ratchet wheel. Filling mechanism. The wheel 601 transfers the bag to station IV where it receives a measured charge from a hopper 720, Fig. 11, after it has been raised to the mouth 180 thereof by a support 162 carried by a parallel linkage 160, 161 and raised by a cam 172 having teeth 173 adapted to jolt the bag and shake down the charge. The jolting is repeated at the next station. Bag closing and securing mechanism. At station VII the bag is raised into the area of folding devices supported on a pillar 206b, Fig. 13. Plates 215a, 216a, supported by parallel linkages 219 .. 222, are moved inwards by cam mechanism to press together the longer the sides while wire bows 215, 216 crease the bag below the plates, the linkages on the two sides of the bag being operatively connected together to move simultaneously. Folding knives 200, 201, Fig. 13c, similarly mounted and operating simultaneously, fold inwards the shorter sides, triangular plates or ploughs 2001, 201<1> at their lower ends ensuring proper folds in the lower part of the bag. The bag is now as shown in Fig. 32. At station IX, angular plates 250, 251 carried by toggle levers depress the folded portion projecting beyond the contents on to the contents when a head on a supporting pillar 260 is lowered. The folded parts are rolled down about the strip and the ends of the strip bent inwards at station X. For this purpose, the bag P, Fig. 16, is supported on a stand 315, 316, raised by cam mechanism to bring the bag first into the paths of the folding devices and thereafter raised further to compensate for the rolling operation. The initially raised bag is centred by auxiliary tongs 301 pivoted on parallel shafts 303, journalled in the support 356 of the mechanism which are geared together by pinions 305, rotation of the pinions by a cam actuated rack 306 opening the tongs for the reception of the bag and closing them thereon on the return stroke of the rack. Two oppositely disposed pairs of tongs 340, 341, Fig. 4, arranged above the auxiliary tongs 301 then effect the twisting movements. Each pair comprises spring closed jaws 342, 343, Fig. 20, pivoted about a common pin 344 secured to a bearing on a shaft 349, the jaws having outwardly bent arms 345, 346 engaged by a sleeve 347 adapted to open them. The shafts 349 are mounted respectively in bearings 350, 380, slidable towards or away from each other on parallel rods 385, and pinions 351, 368 secured on the shafts mesh with pinions 352, 327 on a telescopic shaft 366 which is rotated by a cam actuated toothed sector to effect the twisting. To ensure simultaneous movement of the jaws, the blocks 350, 380 are linked to opposite arms of a cam actuated rocking lever 393 pivoted to a fixed block 387 mounted on the support 356 and itself supporting the rods 385. In operation, the open tongs are moved inwards, closed upon the bag and then rotated, the closing movement being effected by levers 421, 442 engaging the respective sleeves 347 with their lower ends and adapted to be rocked by cam actuated arms 424, 440 pivoted on the block 387. The jaws are then slightly opened prior to being withdrawn from the rolled portion of the bag. Strip bending mechanism. A pillar 800, Fig. 4, adjacent the twisting mechanism supports a head 710, Fig. 26, in which slide vertically cam actuated rods 720a, 720b. These rods carry at their lower ends wedge-shaped dies 721a, 721b which are lowered on to the rolled portion of the bag and continue their motion pushing the bag downwards past fixed rails 722, 723 by which the ends of the stock are bent up vertically. Rollers 724, 725, Fig. 18, on interconnected levers 728, 729 now move inwards to fold the ends closely upon the dies 721a, 721b. The package is now moved to station XI, a guide rail 732 keeping the folded portion closed during the passage, where a presser 735 straddling the rail 732 forces the bent over ends of the strip against the rolled portion. At station XII, the completed package, Fig. 35, is ejected on to a conveyer 740 by a pivoted arm 745.