Severing by tearing or breaking – Breaking or tearing apparatus – Work-parting pullers
Patent
1993-09-14
1997-10-07
Rada, Rinaldi I.
Severing by tearing or breaking
Breaking or tearing apparatus
Work-parting pullers
225105, B26F 302, B65H 3510
Patent
active
056738374
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for high speed stacking of paper sheets or forms. Such a stacking is effected by an apparatus according to the invention both by an accordion-like folding of a continuous band along portions thereof at predetermined spacings and, alternatively, by simply superimposing separate sheets.
Such an apparatus finds particular application both in the preparation of paper for high speed printers, such as laser printers and the like, in the form of a folded continuous band folded in an accordion-like manner to form packages containing a predetermined number of loops or "forms" connected to each other by prepunched cross lines, and in the superimposition, still accordion-like, of said forms coming out of the printer or by simple superimposition thereof after their separation by a tearing action along the aforesaid prepunched lines of the band.
2. Description of the Prior Art
Apparatus are already known by which the problem of the high speed stacking of paper sheets or forms, such as for example those being the subject of the European Patent Application EP-A-368,392, and of EP-A-412,437, in the name of the same Applicant, to which reference shall be made in the description of the apparatus of the present invention.
It has been observed that the apparatus according to the above European applications, although being fully reliable to carry out their duty, sometimes raised operating difficulties with specific reference to the tearing separation of the band both for the carrying out of the separation per se, and for the reason that such a separation produces strains of not negligible value which may induce negative effects on the devices positioned at the inlet of the apparatus for the control of the band advancement in the apparatus. It has been furthermore seen that the flexibility of these apparatus was limited by the fact that they were difficult to use for the stacking of single forms, namely of the forms coming out of the printer as a continuous band and separated from each other for example by tearing.
The stacking of forms separated from each other is not a simple operation mainly because, contrarily to the case of the continuous band for which no particular problems exist in order to "direct" portions thereof towards stopping and/or folding stations for the edges of said portions since the band is a continuous assembly, these problems exist and are important in the case of separate forms both in terms of their guidance and of their proper orientation.
It has been also found that the aforesaid apparatus, as a consequence of the number of operating parts of which they are composed, were of rather cumbersome construction also owing to the necessity of providing more than one control motor for their operation. Moreover the presence of more than one control motor causes the probabilities of an intervening request for the machine maintenance to be increased. The purpose of the present invention is that of providing an apparatus by which the above mentioned problems are solved in an advantageous, very simple and reliable manner.
SUMMARY OF THE INVENTION
A more specific even if non exclusive purpose of the present invention is that of providing a device for the tearing of the individual sheets for the separation thereof so that the sheets are useful in an apparatus of the above-mentioned type.
A further purpose of the present invention is that of providing an apparatus of extremely simplified construction and of particularly reduced size for the high speed stacking of sheets or forms both by means of an accordion-like folding of a continuous band and by superimposing separate sheets one on top of the other, which is fed with a continuous band and comprises dragging means therefor towards diverting or deviating means of its portions suitably spaced or of the initial edge of said sheets towards either a first or a second stopping and/or folding stations positioned at two opposite sides of a sheet stacking plane, band gui
REFERENCES:
patent: 2902197 (1959-09-01), Potdevin et al.
patent: 3794228 (1974-02-01), Colwill et al.
patent: 4529114 (1985-07-01), Casper et al.
patent: 4577789 (1986-03-01), Hofmann et al.
patent: 5230453 (1993-07-01), Meschi
Industria Grafica Meschi SRL
Rada Rinaldi I.
Woods Raymond D.
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