Device and method for the slitting of a web and slitter/scorer machine incorporating said device
AssigneeFosber S.p.A.
InventorMauro Adami
Life of this patent
Estimating the term…
Abstract
The device comprises at least one circular slitting tool (25; 25B) with an axis of rotation located on one side of the path of the web, which works in conjunction with an edge (68; 68B) that supports the web (N) and that is situated on the opposite side of said path (P) from the tool axis and essentially perpendicular to the direction of forward travel (F) of the web and over which said web (N) travels during its advance.
Claims25
A device for longitudinally slitting a web advancing in a longitudinal feeding direction along a web advancing path comprising:
- at least one circular slitting tool having a cutting edge and rotating about an axis of rotation located on one side of said advancing path, wherein said web is a longitudinally continuous web which said cutting edge slits into a plurality of strips in the longitudinal feeding direction;
- a web supporting edge positioned along said advancing path on an opposite side of said advancing path from said axis of rotation and extending essentially perpendicularly to said feeding direction, and positioned to be beneath said web when said web is advancing along said web advancing path;
- said at least one slitting tool having at least one working position downstream of said web supporting edge during said slitting wherein said cutting edge of said at least one slitting tool projects beneath said advancing path and thereby beneath said web into an empty space downstream of said supporting edge with respect to said feeding direction, said cutting edge not contacting said supporting edge and said supporting edge constructed and arranged to support said web during said slitting.
Device as claimed in claim or 1 or 2, further comprising:
- a surface over which said web travels;
- a transverse opening in said surface in correspondence of said at least one slitting tool;
- said supporting edge being positioned along a longitudinal edge of said transverse opening and upstream of said transverse opening with respect to said feeding direction.
Method for longitudinally slitting into a plurality of strips a continuous longitudinal web comprising:
- feeding the web in a longitudinal feeding direction along a web advancing path;
- positioning at least one rotating circular slitting tool with an axis of rotation on one side of said advancing path;
- positioning on a side opposite of said advancing path a web supporting edge essentially perpendicular to said feeding direction and beneath said web;
- bringing said at least one slitting tool close to said supporting edge but clear of said supporting edge;
- supporting said web along said advancing path until said supporting edge is reached;
- and
- causing said at least one slitting tool to project beneath said web into an empty space downstream of said supporting edge with respect to said feeding direction.
Method for longitudinally slitting into a plurality of strips a continuous longitudinal web having an upper surface and a lower surface comprising:
- feeding the web in a longitudinal feeding direction along a web advancing path;
- positioning at least one rotating circular slitting tool with an axis of rotation on one side of said advancing path;
- positioning on a side opposite said advancing path a web supporting edge essentially perpendicular to said feeding direction and beneath said web;
- bringing said at least one slitting tool close to said supporting edge but clear of said supporting edge;
- supporting said web along said advancing path until said supporting edge is reached;
- and
- causing said at least one slitting tool to enter said upper surface of said web upstream of said supporting edge and to project beneath said web into an empty space downstream of said supporting edge with respect to said feeding direction.
Dependencies are inferred from the claim text.