Method and machine for cutting logs of wound web material

A method for cutting logs of wound web material comprising steps of:

• providing a feeding path for logs to be cut;
• arranging along the feeding path a cutting head with at least one disc-shaped cutting blade, the cutting head moving the disc-shaped cutting blade with a cyclical motion to cut the logs and allow a forward movement of the rolls along the feeding path;
• providing at least one store unit for disc-shaped cutting blades associated with the cutting head;
• moving logs of web material sequentially along the feeding path in a direction parallel to a log axis;
• cutting the logs by the disc-shaped cutting blade mounted on the cutting head and severing the logs into small rolls having an axial length smaller than the logs;
• periodically grinding the disc-shaped cutting blade;
• when the disc-shaped cutting blade is so worn that the cutting blade is a worn disc-shaped cutting blade to be replaced:
• temporarily stopping forward movement of the logs;
• removing the worn disc-shaped cutting blade from the cutting head;
• taking a new disc-shaped cutting blade from the store unit, transferring the new disc-shaped cutting blade to the cutting head and mounting the new disc-shaped cutting blade on the cutting head;
• once the new disc-shaped cutting blade has been mounted on the cutting head, re-starting the forward movement of the logs along the feeding path.

A cutting machine for cutting logs of web material comprising:

• a feeding path for logs to be cut;
• a cutting head arranged along a feeding path, said cutting head comprising a coupling for a disc-shaped cutting blade which is configured to impart the disc-shaped cutting blade a rotary motion around an axis thereof and a cyclic movement to cut the logs into rolls, and to allow the logs to move forward along the feeding path;
• at least one store unit for disc-shaped cutting blades associated with the cutting head;
• at least one handling member to remove a disc-shaped cutting blade from the cutting head which is a worn disc-shaped blade to be replaced, and to replace the worn disc-shaped cutting blade with a new disc-shaped cutting blade taken from the store unit.

A method for cutting logs of wound web material, comprising steps of:

• moving logs of web material sequentially along a feeding path in a direction parallel to axes of the logs;
• cutting the logs by a disc-shaped cutting blade mounted into a cutting head and severing the logs into rolls of an axial length smaller than that of the logs, the cutting head moving the disc-shaped cutting blade with a cyclical motion to cut the logs and allow a forward movement of the logs along the feeding path;
• periodically grinding the disc-shaped cutting blade;
• when the disc-shaped cutting blade is so worn that the cutting blade is a worn disc-shaped blade to be replaced:
• temporarily stopping the forward movement of the logs, removing the worn disc-shaped cutting blade from the cutting head, taking a new disc-shaped cutting blade from a store unit, transferring the new disc-shaped cutting blade to the cutting head and mounting the new disc-shaped cutting blade on the cutting head;
• once the new disc-shaped cutting blade has been mounted on the cutting head, re-starting the forward movement of the logs along the feeding path.