US 2012/0245011 A1Published application

Structure of paper converting machine

AssigneeMtc- Macchine Trasformazione Carta S.R.L.

InventorAlessandro DE MATTEIS

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Abstract

A paper converting or rewinding machine provides a cutting or perforation section, equipped with at least one blade arranged to work in combination with a stationary knife to provide the division of the web of paper into a plurality of sheets of measured length. The blade can be integral to a fixed support, or alternatively to a cutting roller that rotates about a longitudinal rotation axis. The blade(s) can be a perforation blade, or a cutting blade, with helical shape, and mounted to a perforation roller. The stationary knife can be mounted to a fixed roller. The blade performs a cutting, or perforation, of the web into sheets working in combination with the stationary knife. The blades and the stationary knifes are long substantially as the width of the paper. In particular, the blade has at least one weakened portion of determined size.

Claims8

Dependent claims

Converting machine paper, or similar products, according to the present invention, comprising:

a feeding section equipped with a means for feeding at least one web of paper along a feeding direction;
a cutting or perforation section, comprising at least one first blade, or cutting blade (25), arranged to contact a second blade, or stationary knife (26), to provide the cutting, or perforation, of the web of paper;
wherein at least one of the blades (25, 26) comprises a plate of metal sheet, the plate having a main body (31) and a cutting edge (32) with a cutting profile;
wherein the main body (31) of the plate of metal sheet has at least one weakened portion (27, 28) arranged at a predetermined distance from the cutting edge (32), the or each weakened portion (27, 28) configured to reduce the stiffness of the plate of metal sheet in such a way that, when the first blade and the second blade contact each other, the weakened portion (27, 28) is configured to cause a modified resilient response that reduces contact forces between the blades and avoids that the web of paper, once cut or perforated, can adhere to the surface of the blades (25, 26).

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 13/426,946Filed 22 Mar 2012
Priority: IT PI 2011A00002722 Mar 2011
Published: 27 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B26D 1/626
And is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder: for thin material, e.g. for sheets, strips or the like
B26D 1/0006
Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus…:…
B26D 1/385
And coacting with a fixed blade or other fixed member: for thin material, e.g. for sheets, strips or the like
B65H 35/08
From or with transverse cutters or perforators: from or with revolving, e.g. cylinder, cutters or perforators