Method and device for stripping a winding mandrel from a roll
AssigneeMaxima S.R.L.
InventorDaniele Dettori
Life of this patent
Estimating the term…
Abstract
A method for stripping a winding mandrel from a roll formed by wrapping a web around the winding mandrel includes the following phases: to support the formed roll so that an end of the respective winding mandrel is adjacent to a gripping and rotating means for the winding mandrel; to connect the gripping and rotating means to the end of the winding mandrel and through this means place the winding mandrel in axial rotation; and to apply, by means of a translation means, an axial force to the gripping and rotating means and to the mandrel and, according with the axial force, translate this mandrel by sliding it off the formed roll.
Claims12
A method for stripping a winding mandrel from a roll formed by wrapping a web around said winding mandrel (M), comprising:
- supporting the formed roll (L) so that an end of the respective winding mandrel (M) is adjacent to a gripping and rotating means (5, 7) for the winding mandrel (M);
- connecting the gripping and rotating means (5, 7) to the end of the winding mandrel (M) and placing the winding mandrel in axial rotation;
- applying an axial force to the gripping and rotating means (5, 7) and to the winding mandrel (M) using a translation means, and translating this winding mandrel in axial translation, according to the axial force, sliding and stripping said mandrel (M) off the formed roll (L),
- wherein the axial rotation comprises axially rotating the winding mandrel (M) in a direction of rotation opposite to the direction of winding the roll and starting such rotation before the axial translation of the winding mandrel (M) or simultaneously with the starting of such axial translation.
A device for facilitating the extraction of a winding mandrel from a roll formed by winding around such winding mandrel having two ends, first and second protruding from this formed roll, wherein said device comprises at least:
- a support element assigned to support the formed roll (L);
- a gripping means (5) assigned to removably connect to the first end of the winding mandrel of the formed roll supported by the support element;
- a motorized translation means connected at least to the gripping means (5) to translate it parallel to a longitudinal axis of the winding mandrel of the formed roll supported by the support element;
- wherein said device further comprises at least:
- a means of supplying gas (49) or pressurized air;
- wherein said winding mandrel is hollow and is provided with a plurality of through holes which pass through the wall placing its internal cavity in communication with the outside, one end of which is occluded and the other end carries an inlet in communication with said cavity and assigned, immediately before and during at least a first section of the winding mandrel extraction stroke by the translation means, to connect to a dispenser (51) connected to said gas supply means (49) for blowing gas or air through said holes between the outer surface of the mandrel and the surface of the central coil of the formed roll.
Dependencies are inferred from the claim text.