Interfolding machine of a web or sheet of paper with a vacuum conveying roller

(19)

(11)

EP 1 457 444 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	26.10.2005 Bulletin 2005/43

(43)	Date of publication A2:
	15.09.2004 Bulletin 2004/38

(21)	Application number: 04003595.8

(22)	Date of filing: 18.02.2004

(51)	International Patent Classification (IPC)⁷: B65H 27/00

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

(30)

Priority:

18.02.2003 EP 03425091

(71)	Applicant: M T C - Macchine Trasformazione Carta S.r.l.
	55016 Porcari (LU) (IT)

(72)	Inventor:
	De Matteis, Alessandro Picciorana, 55010 Lucca (IT)

(74)	Representative: Celestino, Marco
	ABM, Agenzia Brevetti & Marchi, Viale Giovanni Pisano, 31 56123 Pisa 56123 Pisa (IT)

(54)	Interfolding machine of a web or sheet of paper with a vacuum conveying roller

(57) The roller (1) is used for conveying a web or sheet of paper (20) in paper converting machines, for example, a rewinding, a winding, an interfolding machine. It comprises a first outer cylindrical tubular body (2) equipped with a plurality of radial holes (3), arranged according to substantially longitudinal rows, capable of rotating with respect to a second inner fixed body (4) coaxial to it and connected to a suction system. The second body (4) has tubular cylindrical geometry like the first body (2) and has a plurality of apertures (5) and two radial boards (7) arranged at opposite sides with respect to the apertures (5). The inner surface of the first cylindrical tubular body (2), together with the radial boards (7) and to the external surface of the second tubular body (4), define a suction chamber (6) that brings selectively in communication selected rows of holes (3) of the first cylindrical tubular body (2) with the apertures (5) of the second tubular body (4) and then with the suction system of the machine during the relative rotation of the two bodies. Therefore, a web or sheet of paper (20) adheres to the external surface of the first body (2) only in the portion P₁P₂ of surface set between the rows of holes (3') that communicates with the suction chamber (figure 4).

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