Package making – Methods – Filling preformed receptacle and closing
Patent
1996-04-25
1998-03-17
Culver, Horace M.
Package making
Methods
Filling preformed receptacle and closing
53473, 53279, 1984721, 1988031, 1988036, B65B 4350, B65B 4360, B65G 4752, B65G 4792
Patent
active
057273693
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of International application PCT/GB94/01511, filed Jul. 13, 1994.
The present invention relates to methods of transporting objects through apparatus, such as packing machinery for packing materials into cartons, and to methods for the operation of said machinery.
Containers into which liquid or solid contents may be packed include rigid containers such as cans and bottles and non-rigid containers such as cartons. The rigid containers suffer from the disadvantages that they are made from materials which are costly and expensive to transport and store. Compared to cartons however these containers have the advantage that they are more robust and that because of this they can be subjected to greater forces during their handling in packing machines.
It is therefore possible to operate packing machines filling materials into such rigid containers at speeds which are substantially higher than those which are currently achievable for cartons. A typical canning or bottling line may run at 300 to 1000 containers per minute whilst the best carton packing machinery will have difficulty in reaching 200 cartons per minute. Attempts to run such carton packing machines at higher speeds encounter the problem that the cartons are deformed or damaged due to the higher acceleration forces to which they are subjected and hence machine operation becomes unreliable and impracticable.
If one attempts to overcome this problem by making the carton walls thicker and hence more rigid, the cost of the packing materials risks unacceptably and the cartons are unnecessarily robust for their purpose once they leave the packing line.
GB-A-410557 discloses apparatus for packing flour into paper bags in which the bags are supported in respective transport holders, carried round on a first wheel whilst being filled, transferred to a second wheel, and then closed whilst being carried round on the second wheel.
The two wheels are arranged tangential to one another but to transfer from one wheel to the next, the transport holders have to be pushed radially in the instant of transfer. As the transport holders occupy positions on the wheels which are inboard from the periphery of the wheel, this is unavoidable. Containers of liquid could not be treated this way at commercially required speeds without spillage.
Even in the context of filling robust containers, it would be desirable to develop means of carrying them through packing machinery in a smooth and rapid manner.
The present invention now provides a method of conveying objects comprising carrying said objects on a first conveyor and transferring said objects to a second conveyor in respective transfer operations, wherein said first conveyor and said second conveyor each have a location or a plurality of spaced locations for carrying such objects each said location having means for holding a said object in said location, and wherein each said object when held in a said location on said first conveyor follows a path which runs tangential to and in the same direction as a portion of a path followed by said second conveyor, and during each said transfer operation the respective object is momentarily simultaneously in a carrying location of said first conveyor and in a carrying location of said second conveyor to which the said object is transferred.
In contrast to the scheme shown in GB-A-410557, there is no radial displacement with respect to either conveyor path at the instant of transfer.
Preferably each of the first and second conveyors will have a plurality of carrying locations, preferably from 5 to 20 such locations per conveyor, eg. about eight.
Preferably, the or each said carrying location on both the first and the second conveyor comprise recesses for receiving respective ones of said objects such that in each said transfer operation a said object is simultaneously received in and bridges between recesses on said first and second conveyors.
To accommodate the complex rotary relative motion involved between the two conveyors where they run together and t
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Culver Horace M.
Tetra Laval Holdings and Finance SA.
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