Method and apparatus for sharpening a cutting tool. In some embodiments, a sharpener has a guide assembly adjacent a moveable abrasive medium. The medium is advanced at a first speed relative to the guide assembly during a coarse sharpening operation in which a user presents the cutting tool against the medium to shape a side of the cutting tool and generate distended material from the cutting edge (e.g., burrs). The medium is subsequently slowed to a lower, second speed for a fine sharpening operation in which the user presents the cutting tool against the medium to remove the distended material and provide a sharpened cutting edge.

A sharpener for sharpening a cutting tool having a blade portion with a cutting edge, such as but not limited to a kitchen knife. In some embodiments, the sharpener has first and second rollers, with the first roller rotatable about a first roller axis and the second roller rotatable about a second roller axis parallel to the first roller axis. An endless abrasive belt is arranged along a belt path that passes over the first and second rollers to define a planar segment that lies along a neutral plane from the first roller to the second roller. A guide assembly adjacent the planar segment of the belt is configured to contactingly engage the cutting edge of the cutting tool and apply a non-uniform surface pressure to a side of the cutting tool adjacent the cutting edge across a width of the belt.

A finishing belt device includes a pressure apparatus having a pressure roller that applies a pressing force to the rear side of a finishing belt that, when viewed in the running direction of the finishing belt, an active side of the finishing belt is pressed against a peripheral surface to be finished of a workpiece in a linear contact region at the level of the pressing force. A pressure roller support is provided with the pressure roller arranged as a first pressure roller and another pressure roller is arranged as a second pressure roller. When viewed in the running direction of the finishing belt, the active side of the finishing belt is pressed against the peripheral surface to be finished of the workpiece in two spaced-apart linear contact regions via the two pressure rollers. The invention also relates to a method for finishing a peripheral surface of a cam surface.

A finishing belt device includes a pressure apparatus having a pressure roller that applies a pressing force to the rear side of a finishing belt that, when viewed in the running direction of the finishing belt, an active side of the finishing belt is pressed against a peripheral surface to be finished of a workpiece in a linear contact region at the level of the pressing force. A pressure roller support is provided with the pressure roller arranged as a first pressure roller and another pressure roller is arranged as a second pressure roller. When viewed in the running direction of the finishing belt, the active side of the finishing belt is pressed against the peripheral surface to be finished of the workpiece in two spaced-apart linear contact regions via the two pressure rollers. The invention also relates to a method for finishing a peripheral surface of a cam surface.

A polishing method includes rotating a substrate, performing a first polishing process of pressing a polishing tape against an edge portion of the substrate by a pressing member, with a portion of the polishing tape projecting from the pressing member inwardly in a radial direction of the substrate, to polish the edge portion of the substrate and bend the portion of the polishing tape along the pressing member, and performing a second polishing process of pressing the bent portion of the polishing tape inwardly in the radial direction of the substrate by the pressing member to further polish the edge portion of the substrate.

A pressing device (1) for pressing finishing tape against circumferential surfaces (2) of substantially cylindrical work piece sections (3) in a finishing process includes at least one elastically bendable pressing element (5) that is substantially inelastic in the longitudinal direction. A support element (6) has two bearings (7), which are arranged at a distance from each other. The pressing element (5) is fastened to the two bearings, and the two bearings are arranged in such a manner that finishing tape is pressed against a circumferential surface (2) by the pressing element (5) across a contact angle (4) using a pressing force. The pressing device (1) is adjustable in order to process work piece sections (3) of different diameters. The pressing element may be a toothed belt (5) having tooth-like ribs (8), and the toothed belt (5) is interlockingly mounted in the support element (6) using the tooth-like ribs (8).

A pressing device (1) for pressing finishing tape against circumferential surfaces (2) of substantially cylindrical work piece sections (3) in a finishing process includes at least one elastically bendable pressing element (5) that is substantially inelastic in the longitudinal direction. A support element (6) has two bearings (7), which are arranged at a distance from each other. The pressing element (5) is fastened to the two bearings, and the two bearings are arranged in such a manner that finishing tape is pressed against a circumferential surface (2) by the pressing element (5) across a contact angle (4) using a pressing force. The pressing device (1) is adjustable in order to process work piece sections (3) of different diameters. The pressing element may be a toothed belt (5) having tooth-like ribs (8), and the toothed belt (5) is interlockingly mounted in the support element (6) using the tooth-like ribs (8).

The present disclosure provides a belt transmission device and a grinding apparatus. The device comprises: a grinding stand; rotation wheels mounted on the grinding stand, including a driver wheel and driven wheels; a grinding belt supported by rotation wheels; a first sensor fixedly provided on the grinding stand and configured to detect a rotation speed of any one of the driven wheels; and a controller configured to control a rotation speed of the driver wheel and connected with a driving motor of the driver wheel, wherein the controller is further connected with the first sensor, receives rotation speed signals of the one driven wheel detected by the first sensor, calculates difference between the rotation speeds of the driver wheel and the one driven wheel, and compares the difference with a predetermined difference range in the controller; and when the difference is beyond the predetermined difference range, an alarm is provided.

The present disclosure provides a belt transmission device and a grinding apparatus. The device comprises: a grinding stand; rotation wheels mounted on the grinding stand, including a driver wheel and driven wheels; a grinding belt supported by rotation wheels; a first sensor fixedly provided on the grinding stand and configured to detect a rotation speed of any one of the driven wheels; and a controller configured to control a rotation speed of the driver wheel and connected with a driving motor of the driver wheel, wherein the controller is further connected with the first sensor, receives rotation speed signals of the one driven wheel detected by the first sensor, calculates difference between the rotation speeds of the driver wheel and the one driven wheel, and compares the difference with a predetermined difference range in the controller; and when the difference is beyond the predetermined difference range, an alarm is provided.

A polishing apparatus polishes a periphery of a substrate. This polishing apparatus includes a rotary holding mechanism configured to hold the substrate horizontally and rotate the substrate, plural polishing head assemblies provided around the substrate, plural tape supplying and recovering mechanisms configured to supply polishing tapes to the plural polishing head assemblies and recover the polishing tapes from the plural polishing head assemblies, and plural moving mechanisms configured to move the plural polishing head assemblies in radial directions of the substrate held by the rotary holding mechanism. The tape supplying and recovering mechanisms are located outwardly of the plural polishing head assemblies in the radial directions of the substrate, and the tape supplying and recovering mechanisms are fixed in position.