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.

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.

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 cutting machine for the transversal cutting of logs of paper material, including a cutting unit, at least one sharpening unit with two grinding wheels and a device for positioning the grinding wheels. The device includes a primary carriage and two secondary carriages. The primary carriage has a surface arranged at a predetermined distance from the plane of the blade and forming a surface for controlling the run of the secondary carriages. In a first step of positioning the grinding wheels, the secondary carriages bring the abrasive side of the grinding wheels into contact with the surface. In a second step, the secondary carriages bring the abrasive side of the grinding wheels to the plane. In a third step, the primary actuators move the primary carriage until the abrasive side of the grinding wheels contacts the blade.

Disclosed is a method of cutting off self-adhesive linerless endless tape labels, using a cutter of a label printer, wherein the cutter comprises a transport roller, which is rotatable about an axis of rotation, and a blade unit that is linearly travelable in parallel with the axis of rotation of the transport roller and that has a cutting blade directed in the direction toward the transport roller, where tape labels pass between the transport roller and the blade unit, and are transported further step-wise in a motorized manner, by one label, and, between two consecutive further transport steps, the blade unit is linearly traveled in a motorized manner between a start position and a target position in order to cut off a label, such that the label is completely cut off and is held at the transport roller by the blade unit in the target position of the blade unit.

A packing strap length cutting device includes a main body and a control device. The main body has a first frame and a second frame. A strap pulling unit, a calculation unit and a sensing unit are electrically connected to the control device. The strap pulling unit is connected to a strap connecting unit. Thereby, a packing strap can be automatically pulled out a predetermined length through the strap pulling unit, and then the strap cutting unit is driven by a driving member of the strap pulling unit to cut the packing strap in the predetermined length, assisting a user in completing the cutting operation quickly.

The present disclosure is directed to a method for cutting a coreless rolled paper product. The method includes defining a core offset value for a cut, the cut having a starting point and an ending point, setting a plunge speed for a saw to a first plunge speed, and changing the plunge speed to a second plunge speed when the saw reaches the core offset value.

A cutting machine with improved log feed channels includes a plurality of feed channels of logs, a blade assembly for cutting logs, and a discharge assembly of final rolls and head and end trims, wherein every feed channel includes a clamp and a plurality of pushers, chain-moved, for feeding the logs in the clamp, wherein every feed channel includes a pair of chains and every pusher is jointly connected to both the chains of the pair of chains, wherein every chain of the pair of chains has a closed-loop extension defined by four pinions, describing an upper feed branch, a descent branch, a lower return branch and an ascent branch of the pusher.

A sheet feeder, which is configured to feed a sheet to a processing machine, includes a main body, a cutting unit, and an attaching portion. The cutting unit is attached to the main body and includes a cutter slidable in a first direction. The cutting unit is configured to cut, along in the first direction, the sheet to be fed to the processing machine with the cutter. The attaching portion is configured to attach the main body to the processing machine. The attaching portion is attachable to the shaft of the processing machine.