Patent GB-296405-A (GB)
Title: Improvements in devices for closing filled paper bags and the like
IPC: B65B51/08
Filed: 1928-08-15
Abstract: 296,405. Hesser Maschinenfabrik- Akt.-Ges., F. Aug. 31, 1927, [Convention date]. Paper and like bags, folding down mouths after filling.-A device for closing filled paper &c. bags comprises twisting mechanism by which the bag end is twisted into a neck, a slide mechanism for placing a tie-wire around the neck, and a winding mechanism for twisting together the ends of the wire. A bag B, Fig. 1, filled to the line a-b, is brought beneath a ring 1 which is lowered to permit hooks 2 thereon to engage within the bag, whilst arms 11 are lowered to bend it to star shape. The arms 11 are secured to levers 10 pivoted on a head 8 secured to the lower end of a rotatable and vertically reciprocable rod 7, the levers 10 having bowls 12 which engage a cone 14 slidable on the rod 7, against the action of a spring 16. The cone is keyed to the rod 7 to rotate therewith when the rod is rotated by a rack 26 which engages a spur wheel 24 keyed to it. The cone 14 is moved downwards by lever mechanism (not shown) taking the rod 7 with it and causing the arms 11 to bend the bag edge. The ring 1 is raised and when a collar 7<11> on the rod 7 prevents further movement of the rod, the cone continues to move downwards, compressing the spring 16 and closing the arms 11 as it approaches the head 8. The rack 26 then rotates the rod and the arms 11 twist together the parts of the end of the bag. An apertured central pipe 89 allows air to escape from the bag during the operation. The bag is now moved to a second station where a wire 31, Fig. 3, comprising a loop 31<11> having side limbs 31<x> is placed around the twisted neck B<1>. A stack of wires is supported above a table 37 by rods 32, 32<1> which pass through eyelets 31' on the wires but do not extend down to the lowest wire. This wire is thrust forwards by a reciprocating ejector plate 39 and its ends are engaged by the recessed ends 46<11> of levers 46 pivoted to a slide 45 adapted to be reciprocated along a rail 48 by a second slide 55 to which it is connected by a rod 51 and spring 53. The spring abuts against an eye on the slide 45 and presses the eye against a collar 52 on the rod 51 which slides in the eye. The slide 51 carries rollers 58 adapted to engage the bevelled ends 47 of the levers 46. The slide 51 is moved forwards by a lever 60 taking with it the slide 45 until the loop portion 31" of the wire surrounds the neck of the bag whereupon a stop 49 arrests its motion. The slide 51 continues its movement compressing the spring 53 and causing the levers 46 to bend inwards the limbs 31<x> of the wire. Finally the ends of the wire are seized by jaws 60<1> and twisted together. The jaws 60<1> are pivoted to a head 66 secured to a rod 67 rotatable and slidable in bearings 80, 81. Rollers 63<1> on rearward extensions 62<1> of the jaws 60' engage a cone-shaped sleeve 70 rotatable with but slidable on the rod 67. A compression spring (not shown) is disposed between the sleeve 70 and head 66, and sprngs 65 extend to keep open the jaws 60'. The sleeve 70 is moved forwards by lever mechanism 72 taking with it the rod 67 until the jaws cover the ends of the wire, whereupon the sleeve moves on alone compressing the spring and causing the jaws 60<1> to close on the wire. A rack 83 then rotates a spur wheel 82 on the rod 67 to effect the twisting operation.