METHOD FOR PRODUCING A ROLL GRINDER WITH MINIMAL GAP DIMENSIONS BETWEEN THE RUNNING ROLLER AND THE HANDLE BODY

Abstract

A method for producing a roll grinder with two running rollers, a handle body arranged between the running rollers and can be rotated relative thereto, and at least one grinding or polishing surface. The method includes steps of: producing the handle body; measuring the handle body in order to determine the actual dimensions of the handle body; providing at least two differently dimensioned types of spacer elements, by means of each of which a different distance can be set between one of the running rollers and the handle body in the installed state of the roll grinder compared to at least one other type; selecting one of the types of spacer elements provided depending on the measured dimension of the handle body; and connecting the handle body to the running rollers to form the roll grinder while using at least one spacer element of the type selected.

Claims

1-15. (canceled)

16. A method for producing a roll grinder with two rollers, a handle body arranged between the rollers and rotatable relative thereto, and with at least one grinding or polishing surface, the method comprising: producing the handle body; measuring the handle body so as to determine a dimension of the handle body; providing at least two differently dimensioned types of spacer elements, each of which enables determination of a different distance between one of the rollers and the handle body in the assembled state of the roll grinder; selecting one of the types of spacer elements depending on the measured dimension of the handle body; and connecting the handle body to the rollers to form the roll grinder using at least one spacer element of the selected type.

17. The method according to claim 16, wherein the handle body is made of plastic, metal, or wood.

18. The method according to claim 16, wherein the handle body is made of plastic, metal, or wood in once piece.

19. The method according to claim 16, wherein the handle body is made of wood, and a moisture content of the wood is at most 15%.

20. The method according to claim 16, wherein the handle body is manufactured as a cylinder.

21. The method according to claim 16, wherein the measured dimension is a distance between two parallel sides of the handle body.

22. The method according to claim 16, wherein the rollers are made of plastic or metal.

23. The method according to claim 16, wherein each of the rollers is connected, with the interposition of a spacer element of the selected type, to an axle so as to be rotatably mounted on or in the handle body.

24. The method according to claim 23, wherein each of the rollers is non-rotatably connected to the axle.

25. The method according to claim 23, wherein the axle is a stepped axle with a central section and two bearing sections stepped at the ends, and wherein a rolling bearing, one of the spacer elements, and one of the rollers are arranged on each bearing section.

26. The method according to claim 25, wherein, for each rolling bearing the rolling bearing is axially supported on the central section or the spacer element is axially fixed between the rolling bearing and the roller.

27. The method according to claim 25, wherein each rolling bearing is mounted on the handle body so as to be supported by an outer ring on the handle body or by a bearing sleeve arranged thereon.

28. The method according to claim 16, wherein at least one of the rollers has an end face-side grinding or polishing surface.

29. The method according to claim 16, wherein at least one grinding or polishing disc is attached to the roll grinder, the grinding or polishing disc having a grinding or polishing surface.

30. The method according to claim 29, wherein the grinding or polishing disc is detachably mounted on the roller or an axle that the roller is connected to.

31. The method according to claim 16, wherein each of the rollers has a rubber ring running circumferentially at an edge of the roller, which forms a running surface of the roller.

32. The method according to claim 16, wherein the roll grinder is manufactured from a maximum of 14 components, the components comprising: the two rollers, the handle body, two spacer elements, an axle, two rolling bearings, two rubber rings, and at least one grinding or polishing disc.

33. A method for producing a plurality of roll grinders by performing several times the method according to claim 16, wherein at least two handle bodies are produced, wherein each handle body is connected to two rollers to form a roll grinder, using at least one spacer element of the type selected on the basis of the measured dimension of the handle body, thereby maintaining the distance between each of the rollers and the handle body within identical tolerance ranges in all the roll grinders.

34. The method of claim 33, wherein the distance between the handle body and each of the rollers is smaller than 0.5 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawings:

[0031] FIG. 1 is a perspective exploded view of a roll grinder/rolling sharpener according to the first embodiment, which may be manufactured using the method according to some embodiments.

[0032] FIG. 2 is a perspective exploded view of a roll grinder/rolling sharpener according to the second embodiment, which may be manufactured using the method according to some embodiments.

[0033] FIG. 3 is a schematic view of the roll grinder/rolling sharpener according to the first embodiment in an assembled state.

[0034] FIG. 4 is a schematic view of the roll grinder/rolling sharpener according to the second embodiment in an assembled state.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] With reference to the drawings the preferred embodiments will be described in detail below.

First Embodiment (FIGS. 1 and 3)

[0036] In the first embodiment, described below with reference to FIGS. 1 and 3, the roll grinder/rolling sharpener 1 is constructed from a total of 10 or 12 components and includes two rollers 2, a handle body 3 (optionally with two bearing sleeves, not shown), two spacer elements 4, an axle 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 surfaces of the rollers 2.

[0037] Each roller 2 is approximately configured as a cylindrical disc made of stainless steel and includes a circumferential annular groove in the cylindrical lateral area 2a, in which the rubber ring 8 is held positively. The thickness or axial length of the roller 2 is, for example, in the range from 2 to 10 mm, in particular about 8 mm, while the outer diameter (without rubber ring 8) is, for example, in the range from 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 lateral area 2a of the roller 2. On the intended end face of each roller 2 there is an integrally formed grinding/sharpening or polishing surface 1a, 1b. The transition from the circumferential side 2a provided with the annular groove to the end face of the roller 2 is rounded or chamfered, the radius of curvature of the rounding being in the range from 0.5 to 2 mm, in particular about 1 mm. The side of the roller 2 that is intended to face the handle body 3 has a central opening 2b, with which the roller 2 is fitted onto an axle 5 described below.

[0038] The handle body 3 is a hollow cylinder made of wood, which extends along a central axis X3 and has a cylindrical lateral surface 3a, two parallel end faces 3b and a cylindrical central bore 3c. In one variant, the central bore 3c of the handle body 3 (see FIG. 3) includes two sections with different diameters, namely a central section with a smaller diameter and end-side end sections with larger diameters. On the end side of the middle section, two parallel and outwardly facing bearing support sections 3d are provided for axial support of rolling bearings 6. These bearing support sections 3d determine the position of the rollers 2 relative to the handle body 3. In an alternative variant, the handle body 3 includes a central bore 3a of uniform diameter. In this case, in order to fix the rolling bearings 6 described below, a bearing sleeve (not shown) is inserted into the central bore 3a from each end face 3a of the handle body 3, which bearing sleeve is supported by a flange on the end face 3a of the handle body 3 and forms a bearing support section 3d on a base. The bottom of the bearing sleeve is provided with an opening for the axle 5 to pass through. For particularly high-quality designs, the handle body 3 is made in one piece from oak wood, walnut wood, beech wood or spruce wood. The outer diameter of the handle body 3 preferably corresponds to the outer diameter of the roller 2 (without rubber ring 8), so that the lateral area 3a of the handle body 3 and the lateral areas 2a of the rollers 2 are flush with each other in the intended assembly state (see FIG. 3). At the time of manufacture of the handle body 3, the moisture content of the wood should be as low as possible and not exceed 10%. The outer diameter of the handle body 3 is in the range of 50 to 60 mm, for example, and in the present case is approximately 54 mm. The axial length of the handle body 3 is, for example, in the range of 55 to 75 mm and in the present case is approximately 64 mm.

[0039] The axle 5 is formed as a stepped axle 5 with a central section 5a and bearing sections 5b stepped at the ends.

[0040] 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 axle 5 and may be arranged on the latter, so that the inner ring is supported in the axial direction on the central section 5a of the axle 5. The outer diameter and axial length of the rolling bearing 6 are matched to the dimensions of the handle body 3. Accordingly, the rolling bearing 6 may be inserted with a precise fit into the central bore or bearing sleeve of the handle body 3 and be supported axially by the outer ring.

[0041] The spacer element 4 is, for example, an annular washer or cylindrical sleeve that may be slid onto the bearing section 5b of the axle 5 to bear against the inner ring of the rolling bearing 6 and a roller 2. There are provided different types of spacer elements 4, which have different axial lengths, in order to precisely set the distance between the rollers 2 to be attached to the axle 5, depending on the actual dimensions L, L1, L2 of the handle body 3—and thus the gap dimension S between each roller 2 and the handle body 3.

[0042] In the assembled state, the axle 5 and the spacer elements 4, rolling bearings 6 and rollers 2 connected thereto have a common central or rotational axis X5.

[0043] According to the method according to some embodiments, the handle body 3 is manufactured in step A, for example, in one piece from wood in the form of a hollow cylinder.

[0044] After manufacturing, the handle body 3 is measured in step B. In this process, the actual dimensions of the handle body 3 are determined, in this case in particular the length L of the handle body 3. Due to manufacturing tolerances and in particular due to the nature of the natural raw material wood, which may change its shape slightly in particular when the moisture content changes, experience has shown that deviations from the design specifications occur.

[0045] In order to avoid uneconomical reworking of the handle body 3, various types of spacer elements 4 are provided in step C, which have different axial dimensions and may thus be used depending on the measured length L of the handle body 3 to define the intended gap dimension S between each roller 2 and the handle body 3. It is intended here to make the gap S between each roller 2 and the handle body 3 as small and uniform as possible. For example, five different types of spacer elements 4 are provided for this purpose, which differ in axial length L4 by approximately 0.05 mm, for example.

[0046] The distance of the rollers L2 results from the sum of the length L5 of the center section 5a of the axle 5, the length L4 of both spacer elements 4 and the length L6 of both rolling bearings 6. This distance must correspond to the sum of the length L of the handle body 3 and the two gap dimensions S. This results in the following equation 1:

L+2×S=L5+2×L4+2×L6  Equation 1

[0047] Equation 1 may be solved for the length L4 of the spacer elements 4 according to equation 2:

L4=(L+2×S−L5−2×L6)/2  Equation 2

[0048] After selecting a type of spacer element 4 from the provided types of spacer elements 4 depending on the determined dimension L of the handle body 3 (step C) and the desired gap dimension S, as well as the length L5 of the center section 5a and the length L6 of both rolling bearings 6, the roll grinder 1 is subsequently assembled from the above components. In this process, a rolling bearing 6, a spacer 4 and a roller 2 are fitted onto each bearing section 5b of the axle 5 extending through the central bore 3c of the handle body 3, so that the inner ring of the rolling bearing 6 is supported on the central section 5a of the axle 5 and the spacer 4 is fixed between the inner ring of the rolling bearing 6 and the inside of the roller 2. Then, the roller 2 is firmly and non-detachably connected to the axle 5 by press-fitting so that an interference fit is obtained at the connection points. The outer ring of the rolling bearing 6 is fixed to the handle body 3 by force-fitting and, if necessary, by positive fitting.

Second Embodiment (FIGS. 2 and 4)

[0049] In the second embodiment, described below with reference to FIGS. 2 and 4, the roll grinder 1 includes substantially the same components and features as the roll grinder 1 of the first embodiment, except for the following differences:

[0050] Whereas in the first embodiment the grinding and polishing surfaces 1a, 1b are integrally formed on the end faces with the rollers 2 at the end faces thereof and are thus an integral part of the roll grinder 1, the roll grinder 1 according to the second embodiment includes separate grinding/sharpening and polishing discs 7 on the end faces, of which the grinding and polishing surfaces 1a, 1b are formed. The grinding and polishing disks 7 may be detachably connected to the roller 2 or to the axle 5 by screwing formed threaded studs 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 lateral areas 7a of the grinding and polishing discs 7 merge in a flush manner with the lateral area 2a of the respective adjacent roller 2. Instead, the grinding and polishing discs 7 are each chamfered or rounded at the transition between the lateral surface 7a and the respective grinding or polishing surface 1a, 1b. The radius of curvature at the end face of the grinding or polishing disc 7 is, for example, in the range from 0.5 mm to 2 mm and is preferably about 1 mm.

LIST OF REFERENCE SIGNS

[0051] 1 roll grinder/rolling sharpener [0052] 1a grinding/sharpening surface [0053] 1b polishing surface [0054] 2 roller/running roller [0055] 2a lateral area/shell or circumferential side [0056] 2b opening [0057] 3 handle body [0058] 3a lateral area/shell [0059] 3b end face [0060] 3c boring [0061] 3d bearing support section [0062] 4 spacer [0063] 5 axle [0064] 5a center section [0065] 5b bearing section [0066] 6 bearing [0067] 7 grinding/polishing disc [0068] 7a lateral area/shell [0069] 7b threaded stud [0070] 8 rubber ring [0071] A distance between rollers [0072] L length of handle body [0073] L1 distance of bearing support sections [0074] L2 distance from bearing support section to end face [0075] L4 length of spacer [0076] L5 length center section of axle [0077] L6 length of rolling bearing [0078] S gap between end face of handle body and roller [0079] U base [0080] X1 rotational/center axis of roll grinder [0081] X3 rotational/center axis of handle body [0082] X5 rotational/center axis of axis, bearing, if necessary grinding/polishing disc