Cutting machine for transversely cutting logs of paper material
A machine for transversely cutting logs of paper material including a cutting station in which is arranged a cutting unit including an arm rotating about a horizontal axis and on which it can mounted a blade adapted to perform the transverse cutting of one or more logs of paper material introduced in the machine and placed in the cutting station, where is arranged a loading station in which a support is provided for supporting a further blade intended to replace the blade mounted on said arm, and in which said support is connected to a mobile unit allowing it to be moved between said stations. The support is always provided with a blade-holder hub with a respective pin. The blade-holder hub is removably connected to the support.
1 . A machine for transversely cutting logs of paper material, comprising: a cutting station in which is arranged a cutting unit comprising an arm rotating about a horizontal axis and on which arm a blade is mounted to perform the transverse cutting of one or more logs of paper material introduced in the machine, the blade having a blade axis, said arm being placed in said cutting station, wherein the logs of paper material follow respective advancement paths, and the blade and the rotating arm are oriented transversely to the paths followed by the logs of paper material, wherein the horizontal axis around which the arm rotates is parallel to and non-coincident with the blade axis, wherein there is arranged a loading station in which a support is provided for supporting a replacement blade for the blade mounted on said arm, and in which said support is connected to a mobile unit, allowing the support to be moved between said cutting and loading stations while the arm is in the cutting station, wherein the support is provided with a blade-holder hub with a respective pin adapted to engage with the cutting unit, and the blade-holder hub is removably connected to the support, wherein the support is positioned in front of the blade mounted on said arm and is rotatable about a vertical rotation axis located forward of the cutting station, such that the support can be rotated about said vertical rotation axis in front of the blade mounted on said arm.
2 . The machine according to claim 1 , wherein said support has two opposite faces in each of which a seat is formed for a corresponding blade-holder hub.
3 . The machine according to claim 1 , wherein the blade-holder hub is magnetically connected to the support.
4 . The machine according to claim 1 , wherein said mobile unit comprises a carriage movable along a guide which extends between said cutting station and said loading station and said support is constrained to said mobile unit by actuators adapted for moving the same support orthogonally to the guide and for rotating the support around the vertical rotation axis.
5 . The machine according to claim 1 , wherein said support is adapted to simultaneously support a worn blade and a new blade.
6 . The machine according to claim 4 , wherein:
the actuators are a set of actuators and the carriage is connected to an actuator of the set of actuators which controls the movement of the carriage along the guide,
the support is constrained to the carriage by a rotary actuator of the set of actuators that controls the rotation of the support around said vertical rotation axis,
the rotary actuator is, in turn, integral with a horizontal plate that slides on guides formed on the carriage,
the carriage has a compartment in which is housed a linear actuator of the set of actuators connected with the horizontal plate, and
the guides and the linear actuator are oriented orthogonally to the guide such that the support can be moved both along the guide, orthogonally to the guide, and in rotation around said vertical rotation axis.
7 . The machine according to claim 4 , wherein said vertical rotation axis is a central axis of symmetry of the support.
8 . The machine according to claim 1 , wherein said cutting station and said loading station are separated by a movable wall.
9 . The machine according to claim 2 , wherein each seat is provided with positioning keys and one side of the blade-holder hub is provided with positioning slots.
10 . The machine according to claim 9 , wherein said positioning slots are arranged circumferentially around an axis of the blade-holder hub which defines the axis of the respective pin.