Roller mill

Abstract

The invention relates to a device (1) for grinding and / or polishing the cutting edge of a cutting tool, preferably a household knife, the device comprising: a handle (2), at least one roller (3) rotatable relative to the handle (2) and at least one disk (4) rotatable relative to the handle (2), the disk being used for grinding and / or polishing the cutting edge of the cutting tool, wherein the device (1) is movable over a base plate (U) by exerting a force on the handle (2), so that the roller (3) rolls on the base plate (U) when rotating relative to the handle (2) and can rotate the disk (4). In order to further improve the grinding and / or polishing effect of the corresponding device, it is provided according to the invention that the disk (4) can rotate at a different rotational speed / angular velocity than the roller (3).

Description

Technical Field

[0001] The invention relates to a device for grinding and / or polishing the cutting edge of a cutting tool, preferably a household knife, comprising a handle and at least one disk for grinding and / or polishing the cutting edge of the cutting tool. If the device is pulled by manipulating the handle along a surface, such as a table surface, the disk rotates relative to the handle. If the cutting edge of the cutting tool abuts against the disk, the disk grinds the abutting cutting edge due to its rotation or rotation. Background Art

[0002] Corresponding devices, also referred to as “roller grinders,” are known from DE 297 03 326 U1 and EP 3 278 928 A2. With such devices, a particularly uniform grinding of the cutting edge of a cutting tool can be achieved. Summary of the invention

[0003] The object of the present invention is to further improve the grinding and / or polishing effect of corresponding devices.

[0004] To achieve this object, the invention discloses a device according to claim 1. The device according to the invention is used for grinding and / or polishing the cutting edge of a cutting tool, preferably a household knife, and comprises a handle, at least one roller rotatable relative to the handle, and at least one disk rotatable relative to the handle for grinding and / or polishing the cutting edge of the cutting tool, wherein the device is movable above a base plate by applying a force to the handle so that the roller rotatable relative to the handle rolls on the base plate and (preferably thereby) the disk can be rotated, wherein the disk can rotate at a different rotation speed / angular velocity than the roller. Due to the different rotation speeds of the disk relative to the roller, the grinding effect can be adjusted in a targeted manner according to individual needs. For example, the grinding effect and / or polishing effect can be enhanced by increasing the rotation speed of the disk relative to the rotation speed of the roller in such a way that the disk rotates faster than the roller rolls on the base plate. A particularly precise grinding and / or polishing process can be achieved by reducing the rotation speed of the disk relative to the rotation speed of the roller. Preferably, the relationship of the directions of rotation and / or the ratio of the rotational speeds / angular velocities of the disk and the roller can be adjusted, for example, by an adjustable transmission step-up ratio or a transmission step-down ratio, similar to a gear shift. The rotation of the disk can be coupled to the rotation of the roller in time and / or mechanically, for example, when the disk is driven by a transmission coupled to the roller, or can be separated from the rotation of the roller, for example, when the disk is driven by an electric motor or a spring motor. Preferably, the rotation of the disk is caused by the rotation of the roller, for example, when the disk is driven by a transmission coupled to the roller or when the disk is driven by a spring motor. The spring motor can be wound, for example, by the rotation of the roller relative to the handle and / or the disk, wherein the energy stored in the spring motor can then be released by the rotation of the disk independently of the rotation of the roller. In this respect, although the rotation of the disk can be offset relative to the rotation of the roller, the rotation of the disk is caused by the rotation of the roller, because otherwise the spring motor cannot provide energy to drive the rotation of the disk. However, it is also possible that the roller and the disk can be rotated relative to the handle completely independently of one another, for example when the disk is driven by an electric motor and the roller is stationary.

[0005] Advantageous developments of the invention are the subject matter of the dependent claims.

[0006] It can be advantageous if the disk rotates at a different rotational speed / angular velocity than the roller, preferably at a higher rotational speed / angular velocity than the roller, when the roller is rotated relative to the handle, wherein the rotational speed / angular velocity of the disk is preferably at least 50% higher, particularly preferably at least 100% higher than the rotational speed / angular velocity of the roller. In this embodiment, the shorter rolling movement of the roller already leads to a significantly improved grinding or polishing effect than in conventional roller mills, since the disk rotates faster relative to the roller.

[0007] However, it may also prove to be advantageous if the disk rotates in the same direction as or in the opposite direction to the direction of rotation of the roller when the roller is rotated relative to the handle. It may be particularly advantageous if the disk always rotates in the same direction when the roller is rotated, regardless of the direction of rotation of the roller. This can be achieved, for example, by a freewheel. This allows a particularly uniform grinding or polishing effect to be achieved.

[0008] It may be advantageous if the disc rotates with a fixed or adjustable gear ratio relative to the roller when the roller rotates relative to the handle. This also makes it easier to achieve a particularly uniform grinding or polishing effect.

[0009] It is meaningful that the rotational movement of the roller and the disk is coupled via a transmission, preferably via a gear transmission, preferably via a planetary gear transmission. Thus, the rotational movement of the disk can be coupled particularly reliably and proportionally to the rotational movement of the roller.

[0010] It may be useful if the transmission has two coaxial center wheels and at least one transmission wheel movably coupled to the center wheels, preferably the roller and the disc are respectively connected to one of the center wheels or coupled in a non-rotatable manner, preferably the rotation axis of at least one transmission wheel is fixed relative to the handle in a manner offset from the rotation axis of the center wheel. Preferably, the center wheels are meshed via transmission gear teeth, thereby converting the rotation of the roller into the rotation of the transmission wheel and likewise into the rotation of the disc.

[0011] If the roller has an internal toothing, then it can prove to be helpful, wherein the roller is preferably configured as a hollow wheel. In this design, the transmission can be particularly compactly arranged in the roller.

[0012] However, it can also be practical if the device has a shaft rotatably mounted on or in the handle, which shaft is preferably rotated when the roller is rotated relative to the handle, the disk is preferably connected to the shaft in a rotationally fixed and / or releasable manner, and the roller is particularly preferably rotatably mounted on the shaft. In this design, high transmission ratios between the roller and the disk can be achieved in a particularly simple and compact manner.

[0013] It may be useful if the handle, the roller and / or the disk and, if necessary, the shaft are arranged coaxially with respect to one another. This arrangement has proven to be particularly compact and stable.

[0014] It may be expedient if the rotational axes of the roller and of the disk and, if necessary, of the shaft according to claim 8 coincide, preferably coincide with the central axis of the handle. This arrangement has also proven to be particularly compact and stable. In this design, the grinding disk can occupy the entire end face of the device.

[0015] It is helpful if a disk is provided at each of the two end sides of the device, preferably a roller is provided between each disk and the handle, preferably each of the two disks has its own drive, particularly preferably coupled to the roller provided between the disk and the handle via its own transmission. In this design, disks with different layers can be used, for example, for grinding and / or polishing cutting tools. The end sides preferably constitute the axial end sides of the device and extend in a plane perpendicular to its central axis.

[0016] It may prove useful if the handle, roller and disc have exactly the same or substantially the same outer diameter, preferably in such a way that the side surfaces of the handle, roller and disc are arranged flush with each other. This design has an attractive aesthetic appearance and reduces the risk of injury to the user, since there are only small gaps between the rotating parts and no rotating parts protrude. Ideally, the side surfaces of the handle, roller and disc are configured to be exactly cylindrical or approximately cylindrical.

[0017] It may be advantageous if the roller has a surrounding ring, preferably a rubber ring or a silicone ring, which is preferably arranged in at least one groove on the outer circumference of the roller, preferably the ring has a maximum diameter with respect to the axis of the device (all components of the device), so that the ring rolls on the base plate when the device moves over the base plate. The ring, in particular a rubber ring in this design, can achieve non-slip rolling of the roller on the base plate due to its elastic properties. Optionally, the ring can be reversibly transferred from the groove on the outer circumference of the roller to a groove on the outer circumference of the roller, so that when the device moves over the base plate by a force applied to the handle, the disk rolls on the base plate and thus rotates when the handle is rotated relative to the handle. In this case, the device does not roll on the roller, but on the disk. Preferably, the ring is optionally arranged in one of a plurality of grooves on the outer circumference of the roller, wherein the grooves have different diameters, and the ring has a maximum diameter in each of these grooves with respect to the axis of the device (all components of the device), so that the ring rolls on the base plate when the device moves over the base plate. By means of different diameters, the rolling circumference of the roller and thus the transmission ratio between the roller and the disk can be varied in a particularly simple manner. In order to be able to be arranged in different grooves on the outer circumference of the roller, a particularly elastic ring, for example made of rubber, is recommended which can be stretched accordingly and adapted to the corresponding outer diameter of the groove.

[0018] It is practical if the roller is rotatably mounted on a shaft which is rotatably mounted on or in the handle. This design has proven to be particularly compact.

[0019] Another aspect of the invention relates to a system comprising an apparatus according to any of the preceding claims and means for fixing the cutting edge of a cutting tool relative to a disk during grinding and / or polishing, preferably in such a way that the flank face and / or the extension plane of the cutting edge of the cutting tool is oriented at an angle in the range of 5 to 30°, preferably in the range of 10° to 20°, preferably 15°, relative to (the surface of) the disk. Particularly uniform grinding and / or polishing results can thereby be achieved.

[0020] Other advantageous improvements are mentioned below:

[0021] The device preferably has at least one of the following features:

[0022] The device is designed as a roller mill.

[0023] - The device comprises an approximately cylindrical profile.

[0024] The device comprises two planar, preferably parallel end sides.

[0025] - The device comprises a length in the range of 5 cm to 15 cm, preferably in the range of 3 cm to 12 cm.

[0026] - The device comprises a diameter in the range of 2 cm to 15 cm, preferably in the range of 3 cm to 12 cm, preferably in the range of 4 cm to 8 cm.

[0027] The handle preferably has at least one of the following features:

[0028] - The handle is configured as a hollow cylinder.

[0029] The handle comprises a length in the range of 3 cm to 10 cm, preferably in the range of 5 cm to 8 cm.

[0030] The handle comprises a diameter in the range of 2 cm to 15 cm, preferably in the range of 3 cm to 10 cm, preferably in the range of 4 cm to 8 cm.

[0031] The outer diameter of the handle corresponds to the outer diameter of the roller and / or the disc.

[0032] The side surface of the handle and the side surface of the roller are arranged flush with each other.

[0033] The handle extends along an axis which is simultaneously the axis of rotation of the roller and / or the axis of rotation of the disk.

[0034] - The handle is made of wood or metal or a combination of wood and metal.

[0035] - The handle comprises a precisely cylindrical or substantially cylindrical side surface.

[0036] - The handle comprises a precisely cylindrical or substantially cylindrical hole.

[0037] The roller preferably has at least one of the following features:

[0038] The roller is designed in the form of a bush or sleeve.

[0039] The roller comprises a length in the range of 0.5 cm to 5 cm, preferably in the range of 1 cm to 3 cm.

[0040] The roller comprises a diameter in the range of 2 cm to 15 cm, preferably in the range of 3 cm to 10 cm, preferably in the range of 4 cm to 8 cm.

[0041] The side surface of the roller and the side surface of the disk are arranged flush with each other.

[0042] - The roller is made of wood or metal or a combination of wood and metal.

[0043] The roller comprises in the side surface at least one circumferential groove, which is preferably used to accommodate a ring, for example a rubber ring, preferably the roller comprises a plurality of circumferential grooves with different diameters.

[0044] The inner diameter of the roller is smaller on one side than on the other side, preferably smaller on the side facing the disc than on the side facing the handle.

[0045] The roller preferably comprises an inner toothing on the side having the larger inner diameter.

[0046] The disc preferably has at least one of the following features:

[0047] The disk comprises, on the side facing away from the end face, a molded and / or integrally, preferably monolithically, threaded pin, via which the disk is preferably screwed onto a shaft rotatably mounted on or in the handle.

[0048] The disc (excluding the threaded pin) comprises a length in the range of 0.2 cm to 2 cm, preferably in the range of 0.5 cm to 1 cm.

[0049] The disc comprises a diameter in the range of 2 cm to 15 cm, preferably in the range of 3 cm to 10 cm, preferably in the range of 4 cm to 8 cm.

[0050] The side surfaces of the disc and the roller are arranged flush with each other.

[0051] -The disc is made of metal.

[0052] The disk has a ground and / or polished surface on the end side.

[0053] The disk has a grinding and / or polishing layer, preferably made of diamond, on the end side.

[0054] The disk has a chamfer or a radius at the transition between the side surface and the grinding and / or polishing surface.

[0055] The end face of the disk extends exactly or substantially in one plane.

[0056] The disk is arranged at an end side of the device.

[0057] A disk is arranged at each of the two end sides of the device.

[0058] The transmission preferably has at least one of the following features:

[0059] The transmission is designed as a gear transmission.

[0060] The transmission is designed as a planetary transmission.

[0061] The transmission comprises two coaxial or concentric central wheels and at least one transmission wheel coupled to these central wheels.

[0062] The transmission is arranged exactly or substantially between the roller and the handle, preferably in an annular space formed in the roller and enclosed by the handle.

[0063] Further advantageous developments result from the combination of the features disclosed in the description, the drawings and the claims.

[0064] Terms and Definitions

[0065] The handle is used for maneuvering the device or roller mill according to the invention. Thus, the handle is suitable for being held by the user's hand when the roller mill is moved, ie pushed or pulled, above the base plate.

[0066] A roller mill is a grinding device which can be moved in a rolling manner over a base plate so that a grinding and / or polishing disc rotates in order to grind the cutting edge of a cutting tool held against the disc. The roller mill category is based in particular on DE 297 03326 U1 and further developed by EP 3278 928 A2. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] In the attached figure:

[0068] Figure 1 A schematic partial cross-sectional view of a device according to a preferred embodiment of the present invention is shown, wherein the left half of the figure shows a cross-sectional view along the central axis of the device, and the right half of the figure shows an external view of the device;

[0069] Figure 2 The device according to the present invention is shown along Figure 1 Schematic cross-sectional view along the line II-II of , in which the components of the device are shown in simplified form. DETAILED DESCRIPTION

[0070] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0071] The present embodiment relates to a device 1, also referred to as a roller grinder, for grinding and / or polishing cutting tools, such as household knives. The device 1 is designed to move in a rolling manner over a base plate U and to rotate a grinding and / or polishing disk 4 arranged at the end, thereby grinding or polishing a cutting edge 9 of the cutting tool that rests on the disk 4. The principle of such a roller grinder is basically known from the patent documents EP 3278 928 A2 and DE 297 03 326 U1. In the present description of the invention, the differences from the known roller grinders are basically explained.

[0072] Figure 1 and Figure 2 The roller grinder 1 according to the present invention shown comprises a hollow cylindrical handle 2 made of wood, two annular rollers 3 made of metal, which are arranged at the end sides of the handle 2 and can rotate relative to the handle 2, and two circular discs 4 made of metal, which are arranged at the end sides of the roller grinder 1 and can rotate relative to the handle 2, for grinding or polishing cutting tools. The force applied to the handle 2 is usually carried out by the hand of the user, for example by pulling or pressing, so that the roller grinder 1 moves above the base plate U and the rollers 3 rotate relative to the handle 2 while rolling on the base plate U. Each disc 4 is screwed together with a shaft 6 rotatably supported in the handle 2 by a molded threaded pin and is connected to the shaft 6 in a rotationally fixed manner.

[0073] The handle 2 , the roller 3 , the disk 4 and the shaft 6 are arranged coaxially with one another, so that the rotation axis A of the roller 3 , the disk 4 and the shaft 6 coincides with the central axis A of the device 1 or of the handle 2 .

[0074] The disk 4 arranged at each of the two end sides of the device 1 is coupled to the roller 3 arranged between the disk 4 and the handle 2 via its own transmission 5. The handle 2, the roller 3 and the disk 4 have the same outer diameter, so that the cylindrical side surfaces of the handle 2, the roller 3 and the disk 4 are arranged flush with each other. Each roller 3 includes a surrounding rubber ring 7, which is arranged in a groove on the outer circumference of the roller 3. Among all the components of the device 1, the rubber ring 7 has the largest diameter with respect to the central axis A of the device 1, so that when the device 1 moves above the base plate U, the rubber ring 7 rolls on the base plate U.

[0075] Figure 1FIG. 1 shows a partial cross-sectional view of a roller mill 1 according to the present invention along the central axis A of the device 1. As described above, Figure 1 The disk 4 arranged on the right end side is also coupled to the associated roller 3 via a (hidden, preferably identical) transmission 5. However, it is also possible as an alternative to this that the roller 3 and the disk 4 at the right end side are coupled to each other in a rotationally fixed manner, i.e. without a transmission in between, as is known from EP 3 278 928 A2. The left disk 4 and the right disk 4 can also be coupled to the respective roller 3 via different transmissions or transmission ratios.

[0076] The disc 4 is rotated by the rotation of the associated roller 3 relative to the handle 2 through the transmission 5, so that when the roller 3 rotates, the disc 4 rotates at a different speed / angular velocity than the roller 3. Depending on the transmission ratio, the speed / angular velocity of the disc 4 is preferably at least 50% higher than the speed / angular velocity of the roller 3.

[0077] In the present embodiment, the transmission 5 is configured as a planetary gear transmission. The planetary gear transmission comprises two coaxial center wheels 5a, 5b and at least one transmission wheel 5c movably coupled to the center wheels 5a, 5b. In order to optimize the force transmission between the center wheels 5a, 5b and distribute it evenly around the periphery of the roller 3, a plurality of planetary wheels 5c can preferably be arranged around the rotation axis A of the roller 3 at regular angular intervals. The roller 3 is configured as a hollow wheel and comprises an internal toothing on the inner circumference on the side facing the handle 2. The internal toothing meshes with the external toothing of the transmission wheel 5c, the shaft 5d of which is fixed relative to the handle 2 and is offset parallel to the center axis A of the handle 2. The shaft 6 has an external toothing and is also meshed with the transmission wheel 5c.

[0078] When the roller mill 1 rolls along the R1 direction, Figure 2 As shown, the roller 3 rotates in the R2 direction by rolling on the bottom plate U. If the handle 2 is held by a user's hand (not shown), when the roller 3 rolls on the bottom plate U, the handle 2 does not rotate relative to the bottom plate U. Therefore, the shaft 5d of the transmission wheel 5c fixed relative to the handle 2 is fixed in position relative to the bottom plate U and the rotation axis A of the roller 3.

[0079] Due to the tooth meshing between the inner toothing of the roller 3 and the outer toothing of the transmission wheel 5c, the rotational movement of the roller 3 in the direction R2 is converted into a rotational movement of the transmission wheel 5c in the direction R3. The rolling speed or peripheral speed of the gears in the tooth meshing is the same in the area of ​​the pitch circle. However, since the gear diameter or pitch circle diameter of the transmission wheel 5c is significantly smaller than that of the roller 3, the transmission wheel 5c rotates around its axis 5d at a higher rotation speed / angular velocity than the roller 3 around its axis A.

[0080] The rotational movement of the transmission wheel 5c is now transmitted via another toothed engagement to the shaft 6 rotatably supported in the handle 2, which in turn is connected to the disk 4 in a rotationally fixed manner. Since the gear diameters or pitch diameters of the transmission wheel 5c and the shaft 6 are approximately the same, the rotational speed / angular velocity of the shaft 6 is approximately equal to the rotational speed / angular velocity of the transmission wheel 5c. In the present case, the rotational movement of the roller 3 and the corresponding adjacent disk 4 is coupled in such a way that the disk 4 rotates in the direction opposite to the rotational direction of the roller 3 when the roller 3 rotates relative to the handle 2.

[0081] By selecting the gear diameters or pitch diameters of the roller 3 , the drive wheel 5 c and the shaft 6 , the ratio of the rotational speed / angular speed of the disk 4 relative to the roller 3 can be influenced.

[0082] In this embodiment, the roller 3 and the disk 4 are coupled via a transmission 5 , so that the roller 3 is a mechanical drive for the disk 4 .

[0083] If the device 1 is held on the handle 2 and moved in the direction R1 over a base U, for example a table surface, the linear motion is converted into a rotational motion by the rollers 3 rolling on the base U. The transmission wheel 5c is driven by frictional contact or gear contact with the rollers 3, which then transmits its rotational motion to the shaft 6 and the disk 4 connected thereto.

[0084] However, it is also possible that the roller 3 and the disk 4 are mechanically separated from each other, wherein, for example, a sensor detects the rotational movement of the roller 3 and outputs a signal to a control device, which controls a motor based on the signal output by the sensor to generate the rotational movement of the disk 4, so that the roller 3 and the disk 4 rotate at different speeds relative to each other. Therefore, the transmission 5 is not a key feature of the device 1.

[0085] The following embodiments are basically based on Figure 1 and Figure 2 The first embodiment is shown and has the same features except for the differences mentioned below.

[0086] In a second embodiment, the grinding disk is designed to be thicker than in the first embodiment and has a circumferential groove for the rubber ring on the outer circumference. Figure 1 The grooves on the outer circumference of the roller 3 shown are pressed into grooves on the outer circumference of the grinding disk 4 , which changes the rolling speed of the roller mill 1 .

[0087] In a third embodiment, the roller mill 1 has at at least one end a motor-driven grinding or polishing disc 4 which is driven, for example, by an electric drive and is powered by batteries or accumulators.

[0088] In a fourth exemplary embodiment, the roller mill 1 has a spring motor at at least one end as a drive for the disk 4. This allows higher rotational speeds to be used for polishing the knife flanks.

[0089] Reference numerals list

[0090] 1 Equipment or roller mill

[0091] 2 Handles

[0092] 3 Scroll Wheel

[0093] 4 Discs for grinding and / or polishing

[0094] 5 Transmission

[0095] 5a Center wheel

[0096] 5b Hollow wheel

[0097] 5c Drive wheel

[0098] 5d Transmission wheel shaft

[0099] 6 Axis

[0100] 7 Rubber ring

[0101] 8 Device (knife gauge)

[0102] 9 Cutting edge of cutting tool

[0103] A axis of the device (or handle) (rotation axis of the roller and the disc)

[0104] R1 Direction of movement of the device

[0105] R2 Rotation direction of the hollow wheel

[0106] R3 Rotation direction of the transmission wheel

[0107] R4 Direction of rotation of the shaft or center wheel

[0108] U base plate

Claims

1. A device (1) for grinding and / or polishing the cutting edge of a cutting tool, the device include: A handle (2) suitable for being held by a user's hand, at least one roller (3) rotatable relative to the handle (2) and at least one disk (4) rotatable relative to the handle (2), and the disk has a grinding surface and / or polishing surface on the end side for grinding and / or polishing the cutting edge of a cutting tool, wherein the device (1) is movable in a linear motion above a base plate (U) by applying a force to the handle (2), so that the roller (3) rolls on the base plate (U) when rotating relative to the handle (2) and can rotate the disk (4), characterized in that the disk (4) can rotate at a different rotational speed / angular velocity than the roller (3).

2. The device (1) according to claim 1, It is characterized in that When the roller (3) rotates relative to the handle (2), the disk (4) rotates at a rotational speed / angular velocity higher than that of the roller (3).

3. The device (1) according to claim 1 or 2, It is characterized in that When the roller (3) rotates relative to the handle (2), the disk (4) rotates in the same direction as or in the opposite direction to the rotation direction of the roller (3).

4. The device (1) according to claim 1 or 2, It is characterized in that The disk (4) rotates at a fixed or adjustable speed ratio relative to the roller (3) when the roller (3) rotates relative to the handle (2).

5. The device (1) according to claim 1 or 2, It is characterized in that The rotational movement of the roller (3) and the disk (4) are coupled via a transmission (5).

6. The device (1) according to claim 5, It is characterized in that The transmission (5) comprises two coaxial center wheels (5a, 5b) and at least one transmission wheel (5c) movably connected to the center wheels (5a, 5b); the roller (3) and the plate (4) are respectively connected to one of the center wheels (5a, 5b) or connected in a non-rotatable manner; the rotation axis (5d) of the at least one transmission wheel (5c) is fixed relative to the handle (2) in an offset manner with respect to the rotation axis (A) of the center wheels (5a, 5b).

7. The device (1) according to claim 5, It is characterized in that The roller (3) has an internal toothing, wherein the roller (3) is designed as a hollow wheel.

8. The device (1) according to claim 1 or 2, It is characterized in that The device (1) comprises a shaft (6) which is rotatably supported on or in the handle (2), the shaft being rotated when the roller (3) is rotated relative to the handle (2), the disk (4) being connected to the shaft (6) in a rotationally fixed and / or releasable manner, and the roller (3) being rotatably supported on the shaft (6).

9. The device (1) according to claim 8, It is characterized in that The handle (2), the roller (3) and / or the disk (4) and the shaft (6) are arranged coaxially with each other.

10. The device (1) according to claim 8, It is characterized in that The axes of rotation (A) of the roller (3), the disk (4) and the shaft (6) coincide.

11. The device (1) according to claim 1 or 2, It is characterized in that A disk (4) is arranged on each end side of the device (1), a roller (3) is arranged between each disk (4) and the handle (2), and each of the two disks (4) has its own drive.

12. The device (1) according to claim 1 or 2, It is characterized in that The handle (2), the roller (3) and the disk (4) have exactly the same outer diameters in such a way that the side surfaces of the handle (2), the roller (3) and the disk (4) are arranged flush with one another.

13. The device (1) according to claim 1 or 2, It is characterized in that The roller (3) has a surrounding rubber ring (7) which is arranged in at least one groove on the outer circumference of the roller (3), and the rubber ring (7) has a maximum diameter with respect to the axis (A) of the device (1), so that when the device (1) moves above the base plate (U), the rubber ring (7) rolls on the base plate (U).

14. The device (1) according to claim 1, It is characterized in that The cutting tool is a household knife.

15. The device (1) according to claim 2, It is characterized in that The disk (4) rotates at a higher rotational speed / angular velocity than the roller (3) when the roller (3) rotates relative to the handle (2), wherein the rotational speed / angular velocity of the disk (4) is at least 50% higher than the rotational speed / angular velocity of the roller (3).

16. The device (1) according to claim 15, It is characterized in that The rotational speed / angular velocity of the disk (4) is at least 100% higher than the rotational speed / angular velocity of the roller (3).

17. The device (1) according to claim 5, It is characterized in that The transmission (5) is a gear transmission.

18. The device (1) according to claim 17, It is characterized in that The gear transmission is a planetary gear transmission.

19. The device (1) according to claim 10, It is characterized in that The rotation axis (A) of the roller (3), the disk (4) and the shaft (6) coincides with the central axis (A) of the handle (2).

20. The device (1) according to claim 11, It is characterized in that Each of the two discs (4) is coupled to a roller (3) disposed between the disc (4) and the handle (2) via its own transmission (5).

21. A system comprising an apparatus (1) according to any of the preceding claims and a device (8) for fixing the cutting edge (9) of a cutting tool relative to the disk (4) during grinding and / or polishing in such a way that the back face and / or the extension plane of the cutting edge (9) of the cutting tool is oriented relative to the disk (4) in the range of 5° to 30°.

22. The system according to claim 21, in, The flank surface and / or the extension plane of the cutting edge (9) of the cutting tool is oriented relative to the disk (4) in the range of 10° to 20°.

23. The system according to claim 21, in, The clearance face and / or the extension plane of the cutting edge (9) of the cutting tool is oriented at an angle (α) of 15° relative to the disk (4).

Images