Patent Grant
9598189
This application claims priority to Australian Provisional Application No. 2011900972, filed Mar. 17, 2011, the disclosure of which is incorporated by reference herein.
The present invention relates to formers for packaging machines.
Formers are employed to receive bag material in strip form, and reconfigure the strip into tubular bag material for delivery to a packaging machine. Product is delivered to the interior of the tube with the packaging machine then forming transverse seals and transversely cutting the bag material to form bags of product. As a particular example, the product may be a snack food such as a potato crisps.
Traditionally, such as bags of snack foods have been packaged in boxes for delivery to points of sale. More recently the size of the bags has been increasing. This has necessitated the use of larger formers since wider strip bag material is being used so that the tubular bag material is larger in diameter. Large bags are also employed to receive a number of smaller bags.
Formers need to be removed from their mounting adjacent the packaging machine for various reasons, including servicing of the former as well as changing the former so that different sized bags can be manufactured.
Formers are relatively heavy and are mounted in awkward positions. Accordingly the removal and replacement of formers presents a problem.
A former assembly includes a mounting plate to which there is attached a metal sheet that provides the former surface over which the strip bag material passes to be reconfigured into a tubular configuration. The former surface converges upwardly to an upper opening through which there projects a product tube, via which product is delivered to the interior of the bag material.
A disadvantage of the above discussed former assemblies is that the former assemblies are particularly heavy and therefore difficult to manage.
It is the object of the present invention to overcome or substantially ameliorate the above disadvantage.
There is disclosed herein a former assembly for a packaging machine, the assembly including:
a frame to be fixed relative to the packaging machine so that the assembly can deliver tubular bag material to the packaging machine;
a former mounted on the frame, the former being provided to receive strip bag material and reconfigure the strip material into the tubular bag material, the former including a former surface over which the strip material passes to be reconfigured, the former surface converging upwardly to a former opening;
a product delivery (tube) chute extending downwardly to adjacent the opening and via which product is delivered to the interior of the tubular bag material; and wherein
the frame includes an elongated frame member having a central elongated base having opposite end portions, and an arm extending from each end portion with the former being supported by the arm, with the member being tubular to provide for delivery of gas to the interior of the tubular bag material.
Preferably, said elongated frame member (is tubular and) is of a “U-shaped” configuration so as to provide said base and arms that extend horizontally from the base.
Preferably, each arm extends from the base so as to terminate at an end extremity spaced from the base, with the former at least partly supported adjacent the end extremities.
Preferably, a support member is fixed to the former and extends between arms to support the former.
Preferably, said former has a lower periphery, with at least portion of the periphery being bent, which periphery portion extends between the end extremities.
Preferably, said frame includes an upwardly extending chute support having a lower portion attached to the base and an upper portion attached to said delivery chute.
Preferably, said delivery chute support is formed of tubular material.
Preferably, said surface has a plurality of ridges radiating outwardly and downwardly from said opening.
Preferably, said former has an annular edge of arcuate transverse cross-section surrounding said opening and from which said surface diverges downwardly.
Preferably, said edge is a bead.
Preferably, each arm extends from the base so as to terminate at an end extremity spaced from the base, with the former at least partly supported adjacent the end extremities.
Preferably, a support member is fixed to the former and arms to support the former.
Preferably, said former has a lower periphery, with at least portion of the periphery being bent, which periphery portion extends between the end extremities.
Preferably, said frame includes an upwardly extending chute support having a lower portion attached to the base and an upper portion attached to said delivery chute.
Preferably, said delivery chute support is formed of tubular material.
Preferably, said surface has a plurality of ridges radiating outwardly and downwardly from said opening.
Preferably, said former has an annular edge of arcuate transverse cross-section surrounding said opening and from which said surface diverges downwardly.
Preferably, said edge is a bead.
Preferably, the assembly further includes at least one of the arms having a gas coupling to provide delivery of the gas to the frame member.
A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings wherein:
In the attached drawings there is schematically depicted a former assembly 10 for a packaging machine, such as that described in U.S. Pat. Nos. 5,622,032, 7,159,376 and 4,753,336.
The former assembly 10 includes a frame 11 including a first frame member 12 that is of a “U-shaped” configuration so as to have a base 13 from which there extends diverging arms 14. As best seen in
The frame 11 further includes transverse support members 16 fixed to end portions 15 of the arms 14, the member 16 extending inwardly.
Supported by the frame 11 is a former 17 having a former surface 18 over which strip bag material passes to be formed into a tubular configuration. The surface 18 generally surrounds an upright axis 19 and converges upwardly towards the axis 19 to form an annular former opening 20 surrounding the axis 19 passes. Extending toward the opening 20 is a product delivery tubular chute 21 having an interior 22 to which product is delivered for delivery to the interior of the tubular bag material from which bags of product are formed.
The opening 20 is located at the lower end the chute 21 so that bag material engaged with and moving upwardly over the surface 18 is allowed to be redirected downwardly through the opening 20 to then extend in the direction 34 to the packaging machine below.
The surface 18 extends upwardly and terminates at the opening 20 with an annular bead 23 adjacent the opening 20. The bead 23 is in the form of an arcuate edge. A tubular portion 24 of the former 17 extends downwardly from the bead 23. The tubular bag material slides downwardly inside the tubular portion 24 of the chute 21 for delivery to the packaging machine below.
The former 17 is supported by the members 16 by being fixed to the tubular portion 24 of the former 17.
The frame 11 further includes a central mounting 25 fixed to the base 13 so as to extend upwardly therefrom. Fixed to the mounting 25 is an upwardly extending support 26 fixed at its upper end to the product delivery chute 21 to support the chute 21. The chute 21 may also be attached to the mounting 25 so as to be further supported thereby.
The former 17 has a peripheral transverse length 31 that is folded so as to aid in increasing the rigidity of the former 17. This transverse length 31 is secured to a transverse member 27 fixed to the end portions 15. A roller 28 is located adjacent to but spaced from the transverse portion 26 to aid in the delivery of the sheet bag material to the surface 18. The former 17 is therefore supported by the arms 14.
One or both of the arms 15 is provided with a coupling 29 via which a gas can be delivered to the interior of the member 12. As the member 12 is of a tubular construction, the gas can be delivered to the mounting portion 25 from where it is delivered to a backing member 30 (extending from the tubular portion 24) for delivery of gas to the interior of the tubular bag material. If so required, the member 26 may also be tubular for the delivery of a gas to the interior of the product delivery chute 21.
The surface 18 has ridges 32 radiating outwards and downwards from the opening 20 and projecting from the surface 18.
The tubular portion 24 has a recess 33 that provides access to the film when the film is initially being fed into the tubular portion 24.
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