Sheet-material associating – Associating and folding – Zigzag package
Patent
1991-08-12
1992-08-18
Look, Edward K.
Sheet-material associating
Associating and folding
Zigzag package
270 32, 493411, B41L 132
Patent
active
051392470
ABSTRACT:
Machine for high speed folding in an accordion-like manner of bands of elastic materials such as paper, thin plastic laminates or metal sheets coming from coils onto which are stored in a rolled up form, comprising an orientable guide (104) launching the band (102) against an obstacle (24, 26) so as to cause a length of the band to be bent into an arc-shaped manner, thus forming a loop (150), towards a first roller (20) having circumferential grooves (40) and areas (136, 138, 140) having high friction coefficient with respect to the material of the band to be folded, the roller (20) being rotated at a speed such that its peripheral speed is greater than the advancing rate of the band (102), whereby the loop (150) formed by the band is drawn by the roller (20) up to impinge against releaves (32) engaged within the circumferential grooves (40), causing the band (102) to be pinched, thus forming a sharp fold and then to start again the arc-shaped folding in the opposite direction until it comes into contact with the loop a second roller (22), fully identical to the first one (20), whereby the band is pinched between the roller (22) and corresponding releaves (36) engaged in circumferential grooves thereof (44), the band being thus sharply folded again and returned towards the first roller (20), and so on, whereby an accordion-folded package of band (166) is formed up to the desired size. The presence of possible crossing weakening areas in the band at regular spacings makes the size of the accordion folded zone essentially independent from the distance between the first and second rollers (20, 22).
REFERENCES:
patent: 3770264 (1973-11-01), Sturnman
patent: 4838848 (1989-06-01), Lenzi
Industria Grafica Meschi S.r.l.
Look Edward K.
Newholm Therese M.
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