Package making – Closing packages and filled receptacles – By means adapted to engage outturned seam of package cover
Patent
1985-11-12
1987-06-16
Culver, Horace M.
Package making
Closing packages and filled receptacles
By means adapted to engage outturned seam of package cover
53377, 53387, 1986891, 198415, B65B 720, B65B 726
Patent
active
046727922
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement in a sealing machine through which there extends at least one conveyor, which has a plurality of constraining means at predetermined spacing in the conveying direction for packages which are intended to be sealed in the sealing machine after they have been filled.
So far in this type of sealing machine the conveyor has been one using chains and these have been provided with special flights in the form of pins or tongues at predetermined spacing in the longitudinal direction of the conveyor. Since the flight spacing has always been determined beforehand the spaces between the consecutive packages through the machine have been dependent on how great, or rather how long, the packages are which are to be sealed. When the packages are short or small the distance between each package will be great. In other words, the capacity of these sealing machines is always the same, irrespective of whether small or large packages are sealed. Also with this type of sealing machine there is a problem with synchronising the placing of the packages between the flights. It has furthermore been found difficult to prevent slopping over of the contents of the packages when they are moved to or from the respective flight.
The object of the present invention is to provide an arrangement in a sealing machine of the type mentioned in the introduction, in which the disadvantages present in the already known machines have been eliminated. Essentially distinguishing for the invention is that the conveyor comprises one or more belts running side by side and in the same plane, and that the constraining means comprise perforation configurations in the belts, the openings on the underside of the belts being in communication with a vacuum source, and the openings on the carrying side of the conveyor being intended to co-act preferably with the underside of bottom of the packages placed on the conveyor and to locate these with the aid of vacuum while they are conveyed through the sealing machine.
By means of the present invention the packages are now retained along the conveyor during their conveyance through the machine merely with the aid of the vacuum existing in suction boxes in the interior of the conveyors, the suction acting on the underside and/or upper side of the packages via the perforations in the belts. There is thus no longer any need of flights, and the spacing between the packages on the conveyor is determined by the speed of the belts on the first conveyor relative that of the second conveyor at the entry to the sealing machine. In this way the spacing between the packages may be determined taking into account whether large and/or long packages or small and/or short ones are to be sealed, and the distances between packages can be equally as great, independent of package size. In this way optimum spacing of the packages which are to be sealed is achieved with the aid of the arrangement in accordance with the present invention.
The invention will now be described in detail below with reference to the accompanying drawings, whereon
FIG. 1 is a schematic side view of a sealing machine in accordance with the present invention and
FIG. 2 schematically illustrates a plan of the machine illustrated in FIG. 1.
A sealing machine in accordance with the present invention is illustrated in FIGS. 1 and 2, the machine including a base 1, over which there extends at least one conveying means, and in the conveying direction of the packages 7, which are to be sealed, the means comprises conveyors 2 and 3, 8 and 9. The conveyors 2, 3 and 9 include pairs of belts 5, 6 and 11 running side by side and in the same plane and having perforations 19 with their openings facing towards the interior of the conveyors being in communication with a vacuum source, and the openings facing towards the carrying surface of the belts being intended to co-act with the underside or bottom of the packages 7 placed on the conveyors 2, 3, 9. The vacuum source is connected to suction boxes 31, 32 and 35 situated in the con
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Culver Horace M.
Sprinter System AB
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