The machine includes a feeding path for the logs to be cut and a cutting head arranged along the feeding path. The cutting head includes a coupling for a disc-shaped cutting blade and is designed to impart the disc-shaped cutting blade a rotary motion around the axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path. The machine also includes at least a grinding unit, including at least one grinding wheel mounted onto a rotation shaft and co-acting with a side of the disc-shaped cutting blade to grind the cutting edge of the same disc-shaped cutting blade. A controlled approach system is also provided to move the grinding wheel towards the disc-shaped cutting blade.

The machine includes a feeding path for the logs to be cut and a cutting head arranged along the feeding path. The cutting head includes a coupling for a disc-shaped cutting blade and is designed to impart the disc-shaped cutting blade a rotary motion around the axis thereof and a cyclic movement to cut the logs into single rolls, and to allow the logs to move forward along the feeding path. The machine also includes at least a grinding unit, including at least one grinding wheel mounted onto a rotation shaft and co-acting with a side of the disc-shaped cutting blade to grind the cutting edge of the same disc-shaped cutting blade. A controlled approach system is also provided to move the grinding wheel towards the disc-shaped cutting blade.

The grinding unit includes at least one grinding wheel adapted to rotate around a respective rotation axis, and a thrust actuator adapted to push the grinding wheel against a cutting edge of a disc-shaped cutting blade. A load cell is also provided for detecting an axial thrust exerted on the grinding wheel.

The cutting machine includes at least one feed path for elongated products, wherein the elongated products move forward along a direction substantially parallel to the longitudinal extension thereof. The cutting machine includes a rotating unit adapted to rotate around a rotation axis, carrying at least one first disc-shaped cutting blade and one second disc-shaped cutting blade. The rotation of the rotating unit causes an orbital movement of the first disc-shaped cutting blade and of the second disc-shaped cutting blade along trajectories intersecting the product feed path. The first disc-shaped cutting blade and the second disc-shaped cutting blade are offset from each other in a direction parallel to the product feed path. The first disc-shaped cutting blade and the second disc-shaped cutting blade are also angularly offset from each other with respect to the rotation axis of the rotating unit.

The cutting machine includes at least one feed path for elongated products, wherein the elongated products move forward along a direction substantially parallel to the longitudinal extension thereof. The cutting machine includes a rotating unit adapted to rotate around a rotation axis, carrying at least one first disc-shaped cutting blade and one second disc-shaped cutting blade. The rotation of the rotating unit causes an orbital movement of the first disc-shaped cutting blade and of the second disc-shaped cutting blade along trajectories intersecting the product feed path. The first disc-shaped cutting blade and the second disc-shaped cutting blade are offset from each other in a direction parallel to the product feed path. The first disc-shaped cutting blade and the second disc-shaped cutting blade are also angularly offset from each other with respect to the rotation axis of the rotating unit.

A device for taking a sample from a solid body by cutting out, having a frame and a cutting tool retained on the frame in such a way that the cutting tool can be moved relative to the frame, wherein the cutting tool, at least in parts, at least substantially has the shape of a hollow spherical cap or a hollow spherical segment. A method for taking a sample from a solid body by cutting out is implemented with the device.

A bread cutting machine has a circular blade that is moveable in a guide gap through an extension gap of a machine housing from a waiting position into a cutting space. When the blade is in the waiting position, the guide gap is coverable by a rocker displaceable away from the guide gap simultaneously with the extension of the blade from the waiting position, whereby the guide gap is opened. A cover plate is rigidly fastened to a side surface of the rocker, projects vertically away from the rocker, and covers the extension gap whenever the blade is in the waiting position. By a positive guide, the cover plate is moveable away from the extension gap simultaneously with the movement of the rocker, whereby the extension gap is opened.

A bread cutting machine has a circular blade that is moveable in a guide gap through an extension gap of a machine housing from a waiting position into a cutting space. When the blade is in the waiting position, the guide gap is coverable by a rocker displaceable away from the guide gap simultaneously with the extension of the blade from the waiting position, whereby the guide gap is opened. A cover plate is rigidly fastened to a side surface of the rocker, projects vertically away from the rocker, and covers the extension gap whenever the blade is in the waiting position. By a positive guide, the cover plate is moveable away from the extension gap simultaneously with the movement of the rocker, whereby the extension gap is opened.

A cutting machine for the transversal cutting of paper material logs, including: a structure on which are moved the logs; a cutting unit including a blade; at least one sharpening unit with two grinding wheels; a positioning device for positioning the grinding wheels with respect to the blade. The positioning device includes: a primary carriage and two secondary carriages supported by the primary carriage; a sensor for detecting the radius of the blade and configured to stop the primary carriage when the grinding wheels are arranged with the respective axes at a given distance from the axis of the blade. In a second phase of positioning the grinding wheels, the secondary carriages are controlled so as to bring the abrasive side of the wheels into contact with the blade.

A cutting machine for the transversal cutting of paper material logs, including: a structure on which are moved the logs; a cutting unit including a blade; at least one sharpening unit with two grinding wheels; a positioning device for positioning the grinding wheels with respect to the blade. The positioning device includes: a primary carriage and two secondary carriages supported by the primary carriage; a sensor for detecting the radius of the blade and configured to stop the primary carriage when the grinding wheels are arranged with the respective axes at a given distance from the axis of the blade. In a second phase of positioning the grinding wheels, the secondary carriages are controlled so as to bring the abrasive side of the wheels into contact with the blade.