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US 7,293,736 B2Granted
Rewinding machine to rewind web material on a core for rolls and corresponding method of winding
AssigneeFabio Perini S.p.A.
InventorsAlberto Recami, Giuliano Pagliani
Life of this patent
Estimating the term…
Abstract
In a rewinding machine for winding web material onto a core to form rolls which has an unusual capability for accurate regulation of the winding, the web material is supplied to a winding drum and is transferred to the core to form the roll. The core is supported, rotated in controlled manner, and transported along a path in which the roll of web material wound on the core is enlarged whilse bearing continuously on the winding drum.
Claims61
A rewinding machine for winding web material onto a core to form rolls, comprising:
- supply means for supplying the web material at a predefined supply speed;
- a first winding drum rotating with a peripheral velocity substantially corresponding to the supply speed and having a guide for the web material;
- means for gripping the ends of the core during winding;
- means for moving the core along a path in which the roll of web material wound on the core is increased;
- means for rotating the core in order to wind the web material onto the core to form a roll;
- a second winding drum located in opposition to the first winding drum, the path extending through a space defined between the first and second winding drums;
- means for influencing the roll to bear against and remain in contact with the two winding drums as the core moves along the path extending through a space defined between the first winding drum and the second winding drum;
- and
- means for pulling the core axially during winding of the web material, said means for pulling the core axially comprising opposed carriages facing the ends of the core and slidable on guides arranged transverse to the working path;
- wherein said means for gripping comprises a pin and said means for rotating the core comprises a motor for rotating the pin such that said means for gripping directly imparts a rotation to the core, said means for rotating the core being controllable to achieve a peripheral velocity of the roll being formed substantially corresponding to, less than, or greater than the supply speed of the web material.
7 more elements
A method of winding web material on a core to form rolls, comprising:
- supplying the web material at a predefined supply speed;
- guiding the web material in a winding region defined by the space between oppositely arranged first and second winding drums, the web material being guided through the winding region at a speed substantially corresponding to the supply speed;
- engaging each of the ends of the core during winding by a means for gripping;
- imparting a rate of rotation directly on the core by said means for gripping;
- rotating the core to wind a roll of web material in a manner such as to have a predefined peripheral velocity;
- moving the core along a path in which the roll of web material wound on the core is increased, the path extending through the space defined between the first and second winding drums;
- and
- influencing the roll in a manner such that the material is wound onto the core while the roll being formed is kept bearing against and in contact with the two winding drums as the core moves along the path;
- separating web material already wound on the core from the material being supplied by performing a separation step selected from the group consisting of accelerating rotation of the core, moving the core abruptly away from the winding drum, and combinations thereof;
- and
- after said separating, releasing the roll being formed when the roll is fully wound and in a release position of the working path;
- wherein said rotating of the core imparted by said means for gripping is controlled to achieve a peripheral velocity of the roll being formed substantially corresponding to, less than, or greater than the supply speed of the web material.
9 more elements
A rewinding machine for winding web material onto a core to form rolls, comprising:
- supply means for supplying the web material at a predefined supply speed;
- a first winding drum rotating with a peripheral velocity substantially corresponding to the supply speed and having a guide for the web material;
- means for gripping the ends of the core during winding, said means for gripping comprising a pin;
- means for moving the core along a path in which the roll of web material wound on the core is increased;
- means for rotating the core in order to wind the web material onto the core to form a roll, said means for rotating the core comprising a motor for rotating the pin such that said means for gripping directly imparts a rotation to the core, and said means for rotating the core being controllable to achieve a peripheral velocity of the roll being formed substantially corresponding to, less than, or greater than the supply speed of the web material;
- a second winding drum located in opposition to the first winding drum, the path extending through a space defined between the first and second winding drums;
- and
- means for influencing the roll to bear against and remain in contact with the two winding drums as the core moves along the path extending through a space defined between the first winding drum and the second winding drum;
- wherein said means for gripping the core is operatively connected to the means for moving the core, said means for moving comprising carriages arranged facing one another in the vicinity of the ends of the core, the carriages being movable along movement axes arranged parallel to and perpendicular to the working path, and each of the carriages being moved along the axes by at least one actuating device, said actuating device comprising at least one rack and pinion unit operatively connected to a motor.
6 more elements
A rewinding machine for winding web material onto a core to form rolls, comprising:
- supply means for supplying the web material at a predefined supply speed;
- a first winding drum rotating with a peripheral velocity substantially corresponding to the supply speed and having a guide for the web material;
- means for gripping the ends of the core during winding, said means for gripping comprising a pin;
- means for moving the core along a path in which the roll of web material wound on the core is increased;
- means for rotating the core in order to wind the web material onto the core to form a roll, said means for rotating the core comprising a motor for rotating the pin such that said means for gripping directly imparts a rotation to the core, and said means for rotating the core being controllable to achieve a peripheral velocity of the roll being formed substantially corresponding to, less than, or greater than the supply speed of the web material;
- a second winding drum located in opposition to the first winding drum, the path extending through a space defined between the first and second winding drums;
- and
- means for influencing the roll to bear against and remain in contact with the two winding drums as the core moves along the path extending through a space defined between the first winding drum and the second winding drum;
- wherein said means for gripping the core is operatively connected to the means for moving the core, said means for moving comprising carriages arranged facing one another in the vicinity of the ends of the core, the carriages being movable along movement axes arranged parallel to and perpendicular to the working path, and each of the carriages being moved along the axes by at least one actuating device comprising at least one recirculating ball screw unit operatively connected to a motor.
6 more elements
Dependencies are inferred from the claim text.