Embossing unit
OwnerGilberto Spirito, Alessandro Minarelliinventors
Life of this patent
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Abstract
An embossing unit, wherein sheet material is fed between a first and a second embossing roller counter-rotating respectively about a first and a second axis of rotation defining a plane, one of the embossing rollers being subjected, in use, to a compression force towards the other embossing roller; and wherein at least one of the axes of rotation oscillates about a virtual hinge or instantaneous centre of rotation, which is movable, in the plane defined by the axes of rotation, in response to displacement, along a pitch line of tangency between the embossing rollers, of a point of application of a reaction force.
Claims13
An embossing unit comprising a first and a second embossing roller (3, 4) counter-rotating respectively about a first and a second axis (6, 7) of rotation defining a plane, the embossing rollers (3, 4) being tangent to each other along a pitch line (8) lying in said plane;
- and a push assembly (16) for pressing the embossing rollers (3, 4) against each other to grip, in use, sheet material (2) for embossing between the embossing rollers (3, 4) with a given compression force (F);
- at least one of the axes (6, 7) of rotation being an oscillating axis (7) oscillating about a third axis (15) perpendicular to said plane and defining, in said plane, a centre of rotation (C);
- characterized in that the centre of rotation (C) is an instantaneous centre of rotation (C), which is movable in said plane in response to displacement, along the pitch line (8) of tangency between the embossing rollers (3, 4), of a point (A) of application of a reaction force (R) to the compression force (F).
Dependencies are inferred from the claim text.