Dynamic regulation of contact pressures in a blade sharpening system is provided. An example multiphase grinding wheel has a grinding face with one or more abrasive concentric rings for sharpening the cutting blade of the log saw machine, and one or more padded concentric rings consisting of fiber padding. Sharpening with the multiphase grinding wheel improves cut quality, increases blade life, removes glues and varnishes from the cutting blade, reduces blade deformation, and hones the edge of the cutting blade. A pneumatic tensioning system uses air bladders to apply dynamic cushioning and processor-controlled contact pressure between the grinding wheels and the cutting blade during sharpening. The fiber-padded grinding wheels and the air bladder tensioner provide improved sharpness of the cutting blade and longer life for the mechanical components.

There is provided a cutting machine for cutting a wafer using a cutting blade. The cutting machine includes a shape storage section, a shape measurement unit, a determination section, and an end face correction device. The shape storage section stores a cross-sectional shape of a support surface, which a mount of a cutting unit has, in an axial direction of a spindle. The shape measurement unit contactlessly measures the cross-sectional shape of the support surface in the axial direction of the spindle. Through a comparison between the cross-sectional shape stored in the shape storage section and the cross-sectional shape measured by the shape measurement unit, the determination section determines whether or not the support surface needs a correction. The end face correction device corrects a shape of the support surface.

A cutting apparatus includes a chuck table for holding a workpiece thereon, and a cutting unit for cutting the workpiece held on the chuck table. The cutting unit includes a spindle, a mount base fixed to a distal end of the spindle and having an annular coupling face extending around an axis of the spindle and external threads on a distal end portion of the mount base, a ring-shaped ring mount coupled to the coupling face of the mount base and having an annular support surface supporting a surface of an annular base of a hub blade, a coupling mechanism coupling the ring mount to the coupling face of the mount base, and a nut threaded over the external threads of the mount base.

A cutting apparatus includes a chuck table for holding a workpiece thereon, and a cutting unit for cutting the workpiece held on the chuck table. The cutting unit includes a spindle, a mount base fixed to a distal end of the spindle and having an annular coupling face extending around an axis of the spindle and external threads on a distal end portion of the mount base, a ring-shaped ring mount coupled to the coupling face of the mount base and having an annular support surface supporting a surface of an annular base of a hub blade, a coupling mechanism coupling the ring mount to the coupling face of the mount base, and a nut threaded over the external threads of the mount base.

A method, a plant and a blade for cutting logs that provide a cutting region crossed by at least one log according to a conveying direction transversal to a cutting plane, and a blade having a longitudinal axis. The blade comprises a plane cutting portion and a connection portion connected thereto. The cutting portion has a cross section of minimum width, a cross section of maximum width and at least one cutting profile that extends obliquely between the cross section of minimum width and the cross section of maximum width, so that the cutting profile forms an angle with respect to the longitudinal axis. The cutting profile has a cutting height in a direction orthogonal to the longitudinal axis equal to at least the difference between the cross sections of maximum width and of minimum width. The connection portion has width less than or equal to the minimum width.

A method, a plant and a blade for cutting logs that provide a cutting region crossed by at least one log according to a conveying direction transversal to a cutting plane, and a blade having a longitudinal axis. The blade comprises a plane cutting portion and a connection portion connected thereto. The cutting portion has a cross section of minimum width, a cross section of maximum width and at least one cutting profile that extends obliquely between the cross section of minimum width and the cross section of maximum width, so that the cutting profile forms an angle with respect to the longitudinal axis. The cutting profile has a cutting height in a direction orthogonal to the longitudinal axis equal to at least the difference between the cross sections of maximum width and of minimum width. The connection portion has width less than or equal to the minimum width.

A cutting-off machine for the transversal cutting of logs of paper material, including a structure on which the logs to be cut are moved and a cutting unit including a support plate for a blade arranged along a lying plane. The machine includes at least one sharpening unit with two grinding wheels for sharpening the blade on opposite sides of the plane and equipped with an abrasive side and a grinding wheel positioning device with respect to the blade, arranged on each sharpening unit, by which each grinding wheel is placed in a position of contact with the blade in a phase of sharpening the latter starting from a position initial inoperative. The positioning device is equipped with automatic elements for detecting the wear of the abrasive side of the grinding wheels.

A cutting-off machine for the transversal cutting of logs of paper material, including a structure on which the logs to be cut are moved and a cutting unit including a support plate for a blade arranged along a lying plane. The machine includes at least one sharpening unit with two grinding wheels for sharpening the blade on opposite sides of the plane and equipped with an abrasive side and a grinding wheel positioning device with respect to the blade, arranged on each sharpening unit, by which each grinding wheel is placed in a position of contact with the blade in a phase of sharpening the latter starting from a position initial inoperative. The positioning device is equipped with automatic elements for detecting the wear of the abrasive side of the grinding wheels.

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.

A grinding- and polishing tool in combination, comprising a stave which has an edge-treatment side comprising a primary treatment area covering a part of its length, and which in the length direction of the stave is followed by an adjoining secondary treatment area covering another part of the length of the stave. The treatment areas are oriented at intersecting planes such that an intermediate angle between adjoining primary and secondary treatment areas is other than 180°. Also disclosed are a tool assembly, an attachment for a food slicer machine, and a method, all of which are unique implementations of the combined grinding- and polishing tool.