ROLLING GRINDER WITH PRESS FIT BETWEEN ROLLER AND SHAFT

Abstract

A method for producing a rolling sharpener having at least one grinding or polishing face for grinding and/or polishing a cutting tool, the rolling grinder being formed substantially from two rollers, a grip body to be arranged between the rollers and rotatably relative thereto, and a shaft to be supported rotatably in the grip body. To make correct operation of the rolling grinder user-friendly and to facilitate correct operation overall, each of the rollers is connected to the shaft in a frictionally engaged manner.

Claims

1-10. (canceled)

11. A method for producing a rolling grinder having at least one grinding or polishing face for grinding or polishing a cutting tool, comprising: connecting two rollers to a shaft such that the rollers and the shaft are frictionally engaged, wherein a grip body is arranged between the rollers and rotatable relative to the rollers, and wherein the shaft is rotatably supported in the grip body.

12. The method according to claim 11, wherein at least one of the rollers is connected to the shaft in a frictionally engaged manner only.

13. The method according to claim 11, wherein at least one of the rollers is connected to the shaft by press-fitting.

14. The method according to claim 13, wherein the shaft or one of the rollers comprises an insertion bevel or chamfer to facilitate press-fitting.

15. The method according to claim 11, wherein an interference fit between the roller and the shaft is cylindrical.

16. The method according to claim 11, wherein at least one of the rollers has a temperature difference to the shaft.

17. The method according to claim 11, wherein at least one of the rollers is inserted into the shaft.

18. The method according to claim 17, wherein the shaft forms a female component and comprises a bore, and wherein each of the rollers forms a male component and comprises a support section fitting in the bore.

19. The method according to claim 11, wherein at least one of the rollers comprises a grinding or polishing face non-detachably arranged at an end face of the roller.

20. The method according to claim 19, wherein the grinding or polishing face is integrally formed with the roller.

21. The method according to claim 20, wherein the grinding or polishing face comprises a ceramic coating.

22. The method according to claim 11, wherein the grip body is made of wood.

23. The method according to claim 11, wherein the grip body is made of oak wood, walnut wood, beech wood, or spruce wood in one piece.

24. The method according to claim 11, wherein the grip body is a hollow cylinder.

25. The method according to claim 11, wherein an outer diameter of the grip body is in the range of 50 to 60 mm.

26. The method according to claim 11, wherein an axial length of the grip body is in the range of 55 to 75 mm.

27. The method according to claim 11, wherein each of the rollers is a cylindrical disc.

28. The method according to claim 11, wherein each of the rollers is formed of stainless steel.

29. The method according to claim 11, wherein each of the rollers comprises a circumferential annular groove on a circumferential side thereof and a rubber ring fitted in the circumferential annular groove.

30. The method according to claim 29, wherein each of the rollers comprises a rounded or chamfered transition from the circumferential side provided with the annular groove to an end face of the roller.

31. The method according to claim 11, wherein an outside diameter of each of the rollers is in the range of 40 to 60 mm.

32. The method according to claim 11, wherein each of the rollers is connected to the shaft by press-fitting in a frictionally engaged manner, wherein each of the rollers is inserted into the shaft, wherein the shaft forms a female component and has a bore, and wherein each of the rollers forms a male component and comprises a support section fitting into the bore.

33. The method of claim 32, wherein an insertion bevel or chamfer is formed on said roller to facilitate said press-fitting.

34. A method for producing a rolling grinder having at least one grinding or polishing face for grinding or polishing a cutting tool, comprising: connecting two rollers to a shaft such that the rollers and the shaft are frictionally engaged, wherein a grip body is arranged between the rollers and rotatable relative to the rollers, wherein the shaft is rotatably supported in the grip body, wherein each of the rollers is inserted into the shaft, wherein the shaft forms a female component and comprises a bore, and wherein each of the rollers forms a male component and comprises a support section configured to fit in the bore.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0021] FIG. 1 shows a perspective exploded view of a rolling grinder according to the first embodiment, which can be produced by the method discussed herein.

[0022] FIG. 2 shows a perspective exploded view of a rolling grinder according to the second embodiment, which can be produced according to the method discussed herein.

[0023] FIG. 3 shows a schematic view of the rolling grinder according to the first embodiment in an assembled state.

[0024] FIG. 4 shows a schematic view of the rolling grinder according to the second embodiment in an assembled state.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Preferred embodiments are described in detail below with reference to the accompanying drawings.

First Embodiment (FIGS. 1 and 3) - Rollers with Integral Grinding/Polishing Face

[0026] In the first embodiment, described below with reference to FIGS. 1 and 3, the rolling grinder 1 is constructed from a total of 10 or 12 components and includes two rollers 2, a grip body 3 (optionally with two bearing sleeves, not shown), two spacer elements 4, a shaft 5, two rolling bearings 6 (each counting as one component), and two rubber rings 8 arranged on the edges of the rollers 2 to form the running faces of the rollers 2.

[0027] Each roller 2 is approximately configured as a cylindrical disc made of stainless steel and includes a circumferential annular groove in the cylindrical shell surface 2a, in which the rubber ring 8 is held in a form-fitting manner. The thickness or axial length of the roller 2 is, for example, in the range of 2 to 10 mm, in particular about 8 mm, while the outer diameter (without rubber ring 8) is, for example, in the range of 40 to 60 mm, in particular about 54 mm. The rubber ring 8 preferably has an oval cross-section, the main axis of which is preferably aligned parallel to the shell surface 2a of the roller 2. An integrally formed grinding or polishing face 1a, 1b is located on the intended end face of each roller 2. The transition from the circumferential side 2a provided with the annular groove to the end face of the roller 2 is rounded or chamfered, wherein the radius of curvature of the rounding is in the range of 0.5 to 2 mm, in particular approx. 1 mm. The side of the roller 2 facing the grip body 3 as intended has a center opening 2b with which the roller 2 is fitted onto a shaft 5 described below.

[0028] The grip body 3 is a hollow cylinder made of wood extending along a center axis X3 and having a cylindrical shell surface 3a, two parallel end faces 3b and a cylindrical center bore 3c. In one variant, the center bore 3c of the grip body 3 (see FIG. 3) comprises two sections with different diameters, namely a center section with a smaller diameter and end-side end sections with larger diameters. Two parallel and outwardly pointing bearing support sections 3d are formed on the end face of the center section for axial support of rolling bearings 6. These bearing support sections 3d determine the position of the rollers 2 relative to the grip body 3. In an alternative variant, the grip body 3 comprises a center bore 3a of uniform diameter. For fixing the rolling bearings 6 described below, a bearing sleeve (not shown) is inserted from each end face 3a of the grip body 3 into the center bore 3a, which bearing sleeve is supported by a flange on the end face 3a of the grip body 3 and forms a bearing support section 3d on a base. The base of the bearing sleeve is provided with an opening for insertion of the shaft 5. For particularly high-quality configurations, the grip body 3 is produced in one piece from oak wood, walnut wood, beech wood or spruce wood. The outer diameter of the grip body 3 preferably corresponds to the outer diameter of the roller 2 (without rubber ring 8), so that the shell surface 3a of the grip body 3 and the shell surfaces 2a of the rollers 2 are flush with each other in the intended assembly state (see FIG. 3). At the time of production of the grip body 3, the moisture content of the wood should be as low as possible and not exceed 10%. The outer diameter of the grip body 3 is, for example, in the range of 50 to 60 mm and in the present case is approx. 54 mm. The axial length of the grip body 3 is, for example, in the range from 55 to 75 mm and in the present case is approx. 64 mm.

[0029] The shaft 5 is configured as a stepped shaft 5 with a center section 5a and bearing sections 5b stepped at the ends.

[0030] The rolling bearing 6 is, for example, a commercially available ball bearing. The inner diameter of the inner ring of the rolling bearing 6 is matched to the outer diameter of the bearing section 5b of the shaft 5 and can be arranged on this, so that the inner ring is supported in the axial direction on the center section 5a of the shaft 5. The outer diameter and axial length of the rolling bearing 6 are matched to the dimensions of the grip body 3. The rolling bearing 6 can therefore be inserted precisely into the center bore or bearing sleeve of the grip body 3 and be supported axially with the outer ring on the bearing support section 3d.

[0031] The spacer element 4 is, for example, an annular disc or cylindrical sleeve which can be slid onto the bearing section 5b of the shaft 5 in order to be supported on the inner ring of the rolling bearing 6 and a roller 2. Different types of spacer elements 4 are provided, which have different axial lengths in order to precisely adjust the distance between the rollers 2 to be attached to the shaft 5, depending on the actual dimensions of the grip body 3 - and thus the gap dimension between each roller 2 and the grip body 3.

[0032] In the assembled state, the shaft 5 and the spacer elements 4, rolling bearings 6 and rollers 2 connected to it have a common center or rotational axis X5.

[0033] The rolling grinder 1 is assembled from the above components by fitting a rolling bearing 6, a spacer element 4 and a roller 2 onto each bearing section 5b of the shaft 5 extending through the center bore 3c of the grip body 3, so that the inner ring of the rolling bearing 6 is supported on the center section 5a of the shaft 5 and the spacer element 4 is fixed between the inner ring of the rolling bearing 6 and the inside of the roller 2. The roller 2 is then firmly and non-detachably connected to the shaft 5 by press-fitting, so that an interference fit is produced at the connection points. The outer ring of the rolling bearing 6 is fixed to the grip body 3 by frictional locking and, if necessary, by form-fit locking.

Second Embodiment (FIGS. 2 and 4) - Rollers with Separate Grinding/Polishing Roller

[0034] In the second embodiment, described below with reference to FIGS. 2 and 4, the rolling grinder 1 comprises substantially the same components and features as the rolling grinder 1 of the first embodiment, except for the differences mentioned below:

[0035] Whereas in the first embodiment the grinding and polishing faces 1a, 1b are integrally formed at the end faces with the rollers 2 and are thus an integral part of the rolling grinder 1, the rolling grinder 1 according to the second embodiment comprises separate grinding and polishing wheels 7, on the end faces of which the grinding and polishing faces 1a, 1b are formed. The grinding and polishing wheels 7 can be detachably connected to the roller 2 or to the shaft 5 by screwing integrally formed threaded sockets 7b into corresponding mating threads. In deviation from the first embodiment, the rollers 2 are not chamfered or rounded on the outward-facing end face, so that the shell surfaces 7a of the grinding and polishing wheels 7 merge flush with the shell surface 2a of the respective adjacent roller 2. Instead, the grinding and polishing wheels 7 are chamfered or rounded at the transition between the shell surface 7a and the respective grinding or polishing face 1a, 1b. The radius of curvature at the end face of the grinding or polishing wheel 7 is in the range of 0.5 mm to 2 mm, for example, and is preferably approx. 1 mm.

TABLE-US-00001 List of Reference Signs 1 rolling grinder 1a grinding face 1b polishing face 2 roller 2a shell surface or circumferential side 2b opening 3 grip body 3a shell surface 3b end face 3c bore 3d support section 4 spacer element 5 shaft 5a center section 5b bearing section 6 rolling bearing 7 grinding and polishing wheels 7a shell surface 7b threaded socket 8 rubber ring U base X1 rotary/center axis rolling grinder X3 rotary/center axis grip body X5 rotary/center axis of shaft, rolling bearing, grinding and polishing wheel, if applicable