| US 7,484,445 B2 | ||
| Punching and/or perforating equipment for continuous forms | ||
| Giuliano De Marco, Ivrea (Italy); Armando Aprato, Lugnacco (Italy); Francesco Terrusi, Milan (Italy); and Alberto Massucco, Ivrea (Italy) | ||
| Assigned to Tecnau S.R.L., (Italy) | ||
| Filed on Jun. 03, 2004, as Appl. No. 10/859,071. | ||
| Prior Publication US 2005/0034582 A1, Feb. 17, 2005 | ||
| Int. Cl. B23D 25/02 (2006.01) | ||
| U.S. Cl. 83—342 [83/469; 83/343; 83/678; 83/671] | 6 Claims |
| 1. A perforating equipment for continuous paper forms comprising a contrast roller substantially tangent to the movement surface
of the form, a perforating blade carried by a blade support provided for rotation in a condition of interference with said
form against the contrast roller for the execution of transversal weakening perforations on the form in movement, said form
having a given width and being provided for being longitudinally cut into continuous forms of half width,
wherein the contrast roller and the blade support are rotatably supported by side bearings and have respective rotation axes
parallel one another and slightly inclined with respect to a reference axis perpendicular to the direction of movement of
the form;
wherein the perforation blade is defined by a helical cutting edge with fine teeth having an inclination angle equal to the
angle of inclination of said rotation axes with respect to the reference axis for a progressive perforating in a first direction
from a side edge of said form; and
wherein said equipment comprises two sets of perforating blade and contrast roller arranged one behind the other along the
direction of movement of the paper form;
said equipment further comprising a moving device engaging the perforated form downwardly with respect to the sets of perforating
blade and contrast roller and two respective servomechanisms responsive to position indications of the form for independently
rotating the blade support of said two sets of perforating blade and contrast roller from a condition of disengagement of
the perforation blade to the condition of interference and to the condition of disengagement;
said servomechanisms providing a peripheral velocity of the perforation blade of said two sets of perforating blade and contrast
roller, at the moment of the perforation, equal to the moving velocity of said paper form;
wherein the perforating blade of one of the two sets of perforating blade and contrast roller extends along the respective
blade support for a length equal to a first half of the given width of the paper form for executing a weakening perforation
on a first half of the continuous paper form; and wherein the perforating blade of the other of the two sets of perforating
blade and contrast roller extends along the respective blade support for a length equal to a second half of the paper form
for executing a weakening perforation on a second half of the continuous paper form independently of the perforation on the
first half of the form;
the perforating blade and the contrast roller of the one of the two sets of perforating blade and contrast roller and the
contrast roller of the other of the two sets of perforating blade and contrast roller and the respective helical edges of
said perforating blades having opposite inclinations with respect to the reference axis, to begin the perforations from opposite
side edges of said paper form, staffing from the edges of the paper form adjacent to the side bearings.
|