Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Patent
1987-10-06
1989-06-13
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
493413, 270 39, B65H 4520
Patent
active
048388483
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a continuous paper band folding apparatus to form piles.
The larger and larger use of fast printers brings under specific applications to supply such printers directly from reels of paper preworked or not. In case of using non-preworked paper reels, the feeding machines provide for the machining of paper, i.e. punching of "feed holes" and "cross perforations". Such machining is needed for the following purposes:
Feed holes allow paper band to be fed by means of the socalled tractor feed, i.e. by means of teeth entering the feed holes and allowing a precise and fast positioning of the band without slippage.
Cross perforations of the band are predetermined lines of weakening of the paper so that tearing and folding are made easier. In practice such lines define the "pages" of a continuous paper band.
In both cases of feeding from either "virgin" or preworked paper reel the paper coming out of the printer either is torn sheet by sheet and stacked in piles or folded back like an "accordion". In the latter case which is the most usual for intuitive reasons of practicality, the most rational way to collect paper is to automatically form piles separated from one another for each printing job. Industries propose to solve this problem by first folding the paper fed from reels and not from piles preformed in printing houses and then by carrying it away from the folding head in so called "scales".
The paper folded back along cross perforation lines is put in scales on a belt conveyor performing the task to carry it away from the folding head. Operators are provided at intervals to cut the paper band and to collect it in piles manually. This is needed as the folding back of the paper is carried out by means of spirally twisted screws placed near each edge of the folded sheet. Such screws have the advantage of correctly operating as "folding units" both at low and high speed, but do not allow the folds thus formed to be "squeezed" along the whole extension thereof. Moreover paper has to come out of the folding head continuously so that considerable variations of the delivery scopo of sheets already folded by the "screws" are avoided, thus achieving generally the so called "scales".
The present invention seeks to provide a continuous paper band folding apparatus which is free from the troubles of the presently available apparatus.
The present invention, which is the result of an accurate research, satisfactorily works both as for the precision needed for the first folding of the paper and as for the squeezing of the effected fold which is needed to allow the pile to be formed directly by the folding head.
The apparatus according to the invention is provided with means, parts and members already known and used in the present folding heads as well as means, parts and members of novel design and use. Among the former there are the moving paper carrier plate, on which the continuous paper band from a reel is folded back by gravity like an "accordion"; the so called "tractor feed",i.e. a feeding system supplying paper to the moving plate and using feed holes evenly spaced apart and formed on both edges of the paper band, said system being provided with outer teeth entering the side holes to feed the paper band like a cinematographic film; and side cages retaining the paper pile and defining the dimension thereof, i.e. the longitudinal dimension of the single sheets and the interval between two folds in succession as well.
Among the latter there are the folding and squeezing means and a moving retractable device guiding and promoting the folds to be formed in the paper band which is laid down on the moving plate, as better disclosed herebelow.
The apparatus of this invention will be illustrated more in detail with reference to the accompanying drawing, in which:
FIG. 1 is a perspective schematic view of a continuous paper band folding head provided with the apparatus according to the invention;
FIG. 2 is a rather schematic end elevation of the folding head of FIG. 1;
FIG. 3 is a perspective vi
REFERENCES:
patent: 3770264 (1973-11-01), Sturman et al.
patent: 4172592 (1979-10-01), Mueller et al.
patent: 4650447 (1987-05-01), Meschi
Lavinder Jack W.
Schmidt Frederick R.
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