Package making – Means to open or erect receptacle – Means to open bag
Patent
1983-05-25
1985-09-17
Crane, Daniel C.
Package making
Means to open or erect receptacle
Means to open bag
53211, 493157, 493308, B65B 1104, B65B 4914, B31B 128
Patent
active
045412200
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device which is used, when a cylindrical object, particularly a roll of paper, is being packed, for folding the edge of the wrapping wound around the object against the end of the object. In the present invention, the said device is called edge folder.
When paper rolls are being packed, a wrapping paper whose width is larger than the length of the roll to be packed is most usually used as mantle wrapping, such that the edges of the wrapping paper extend beyond the ends of the roll. This is in order that the edges of the wrapping paper can be folded against the ends of the roll, and circular end plates corresponding to the diameter of the roll are placed against the folds and usually glued thereon. Hereby the package formed by the wrapping paper and by the end plates becomes closed, thereby protecting the roll during handling and transportation.
The folding of the edges of the wrapping paper takes place either manually or mechanically. A drawback of manual work is that the work is hard, expecially when thick wrapping paper is used as several layers. Moreover, folding made by hand remains loose, because manually the wrapping cannot be pressed very tightly against the ends of the roll. On the other hand, loose folding allows such portions to remain in the finished package as are torn during the various stages of handling, thereby causing damage to the roll, with resulting rejection.
In view of elimination of these drawbacks, there are various methods and devices for mechanized folding of the edges of wrapping paper. As such a device, a device is commonly used in which, from the top and from the side of the roll, a wheel is brought into contact with the end of the roll which, while revolving simultaneously with the roll, causes folding of the edges of the wrapping paper against the end. It is a drawback of such a device, among other things, that, in order that the device should work, it requires transfer means for both vertical and horizontal movement within the range of variation of the diameters and lengths of all the rolls to be packed. Moreover, the device must have separate sensing means for controlling the movement in the horizontal direction and in the vertical direction in order that the device could operate automatically and efficiently within the range of variation of all of the rolls to be packed. The constructions required by such movements in different directions are complicated and, in order to be able to operate, require a rather large space, for which reason the devices become expensive to construct and difficult to install, e.g., in existing packaging plants, in which usually no space has been provided for them.
In the device described above, the wheel forming the fold glides against the end of the roll and, when gliding, rubs both against the wrapping paper and against and end sheet placed against the end of the roll and remaining underneath the folding. This requires, among other things, that the wrapping paper must be sufficiently strong in order to stand said rubbing and that the width of the wrapping paper in excess of the roll length is appropriate, and not excessive, which excessive length causes incomplete folding, nor insufficient, which would again cause difficulties, for example, for the end sheet to remain underneath the folding during the folding operation. Owing to the above circumstances, it is prerequisite for reliable operation of the device that the quality and the width of the wrapping paper are exactly predetermined, which again causes additional requirements and additional costs in the acquisition of wrapping papers.
Another device that is commonly used is described in the Finnish Pat. No. 45,536, wherein the members used for folding the edge of the wrapping paper are placed between the rollers rotating the roll so that the device comprises a separate wheel, to which the wings forming the folds have been attached, as well as a separate pressing device, by means of which the folds produced are pressed against the end of the roll. The space r
REFERENCES:
patent: 2938319 (1960-05-01), Nystrand
patent: 3315432 (1967-04-01), Turnbull et al.
patent: 3533332 (1970-10-01), Young et al.
patent: 3605382 (1971-09-01), Andersson
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