Manufacturing container or tube from paper; or other manufacturi – Bending – Crushing or crumpling
Patent
1998-03-27
2000-03-07
Sipos, John
Manufacturing container or tube from paper; or other manufacturi
Bending
Crushing or crumpling
493372, 493967, 83282, B31B 100
Patent
active
060333545
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a parting device designed to sever a material having generally the shape of a continuous band in displacement along an axis perpendicular to said device, and operating by tearing off each successive section. The invention relates also to the machines equipped with said device, a method for its operation, as well as the obtained products.
BACKGROUND OF THE INVENTION
The cushioning dunnage product obtained at the outlet of a cushioning dunnage producing machine comprises generally a resilient band with a central zone of a thickness less than the lateral edges, which have the shape of longitudinal pads or pillows. In order to use such a material in a cushioning fashion to protect various articles during shipment, sections of various lengths are required depending on the volume of the container and the dimensions of the article to be shipped therein. This is why severing devices are needed at the machine outlet.
Up to now, such devices comprised movable knives, as is described for example in U.S. Pat. Nos. 4,699,609 and 5,123,889. In the first of those patents, the cutting device is of the shearing type comprising a fixed blade and a movable blade actuated by an electric motor. The second patent is presented as an improvement to said cutting device, inasmuch as the driving means includes a combination of motor means and an usual mechanical crank-linking rod linkage to provide a better control of the successive cutting operations, by a transformation of the rotative motor means into a linear alternative displacement.
In the above mentioned patents the severing devices of the prior art are operating by a lateral shearing which therefore applies a lateral action upon the plies of the material which have been previously connected together by mechanical means imparting to said plies a rather irregular cohesion, for example by coining, corrugating or the same. The shearing efforts have for consequence to reduce the effects of this friction connection obtained upon the successive plies obtained by the above processes and can even reduce the cohesion of the product at the severed ends.
In opposition to that the severing device of the invention provides a better connection of the plies at each severed end, which has for effect to substantially improve the cohesion of the cushioning dunnage products obtained.
SUMMARY OF THE INVENTION
More specifically, according to the invention, the tearing off of successive sections of cushioning dunnage is carried out in two successive steps: in a first step, the band-like material is immobilized at least in the tearing off zone, and in a second step, the device tears through the immobilized material in a direction perpendicular to the axis of displacement of the material.
This device is particularly adapted to be used at the outlet of machines for producing cushioning dunnage materials from a band-type paper stock, formed from either single or plural plies, the lateral edges of which have been folded laterally inwardly upon the central longitudinal zone of the band, and which is then driven longitudinally, crumpled and tightly connected by successive compressions.
As explained above, the severing action of the device of the invention is obtained through tearing off means applied to the material section down stream of the device, and acting by a tearing process perpendicularly to the displacement axis of the initially continuous band of stock material. Said tearing means comprises means to tightly keep said material immobile at least in the tearing zone, whereas tearing means are acting upon it to severe the downstream section.
Said means do not act simultaneously, but at least partially in sequence, so that the tearing is carried out only when the band is immobilized. According to the invention, the severing device comprises means for repetitively and at least sequentially controlling the movement of the means keeping the band material in a fixed position and of the tearing means.
Preferably, said controlling means comprises at
REFERENCES:
patent: 3895751 (1975-07-01), Shepherd, III
patent: 4601225 (1986-07-01), Starnes et al.
patent: 4699609 (1987-10-01), Komaransky et al.
patent: 4717613 (1988-01-01), Ottaviano
patent: 5107732 (1992-04-01), Hanmer
patent: 5123889 (1992-06-01), Armington et al.
patent: 5213867 (1993-05-01), Huston, Sr. et al.
patent: 5569146 (1996-10-01), Simmons
Jensen Steven
Naturembal (S.A.)
Sipos John
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