WO2009007231A1

WO2009007231A1 - Grinding belt device for grinding and/or sharpening knives

Info

Publication number: WO2009007231A1
Application number: PCT/EP2008/058000
Authority: WO
Inventors: Hans-Peter Zahnd
Original assignee: Hans-Peter Zahnd
Priority date: 2007-07-07
Filing date: 2008-06-24
Publication date: 2009-01-15
Also published as: EP2014414A1

Abstract

The grinding device (1), in particular for grinding and/or sharpening knives, comprises a first and a second driven endless grinding belt (2, 3) with an abrasive surface (2d, 3d), wherein each endless grinding belt (2, 3) is guided and held by a first or second driving and bearing device (4, 5) in such a manner that the abrasive surfaces (2d, 3d) of the two endless grinding belts (2, 3) form a gap (S) for grinding a blade, characterized in that the first and second driving and bearing devices (4, 5) each comprise two deflecting rollers (4a, 4b, 5a, 5b) against which the first and second endless grinding belts (2, 3) respectively bear, in that the abrasive surfaces (2d, 3d) of the first and second endless grinding belts (2, 3) have grooves (2b, 3b) and webs (2c, 3c) running in the driving direction (2e, 3e), in that at least one web (2c, 3c) has the abrasive surface (2d, 3d), and in that the two endless grinding belts (2, 3) are arranged running in an opposed manner such that the grooves (2b, 3b) and webs (2c, 3c) of the two endless grinding belts (2, 3) lie one inside another along a subsection (T) in the driving direction (2e, 3e).

Description

BELT GRINDER FOR GRINDING AND / OR SHARING KNIVES

The invention relates to a grinding device according to the preamble of claim 1.

The document US 3,775,913 discloses a grinder for grinding or resharpening knives. This grinder comprises two rotating, driven sanding belts, which are arranged side by side and viewed from the front side have a mutually V-shaped course, so that a blade can be ground simultaneously on both sides.

This sander has the disadvantages that it is difficult to sharpen a longer blade evenly, that there is a risk that steps are ground into a blade, and that the blade can not be ground close to the handle.

It is therefore an object of the invention to form a more advantageous grinding device. This object is achieved with a grinding device having the features of claim 1.

The dependent claims 2 to 13 relate to further, advantageously configured grinding equipment.

The object is achieved in particular with a grinding device, in particular for grinding and / or sharpening knives, _

comprising a first and a second driven endless abrasive belt having an abrasive surface, each endless abrasive belt being guided and held by a first and a second drive and bearing device such that the abrasive surfaces of the two endless abrasive belts form a gap for grinding a blade and second drive and bearing device comprises two pulleys, respectively, to which the first and second endless abrasive belt abuts, and wherein the first and second endless abrasive belt at its abrasive surface in the drive direction extending grooves and webs, and wherein at least one web has the abrasive surface, and wherein the two endless abrasive belts are arranged to extend mutually in such a way that the grooves and webs of the two endless abrasive belts lie mutually in the drive direction along a partial section.

The inventive grinding device has the advantage that knives can be provided with an unusually good finish. The intermeshing of the webs and grooves of the two endless abrasive belts has the advantage that the

Endlosschleifbänder perpendicular to their course form a relatively deep and defined designed grinding surface or a defined gap, so that the knife can be sharpened accurately and reproducibly. The endless abrasive belts have the advantage that they, in particular in the region of the gap, with a blade held in the gap can escape a little, in contrast to grinding wheels whose surface has a well-defined position. When a blade to be ground is held in the nip formed by the endless grinding belts, the endless grinding baths are deviated due to the influence of the _

Blade, back a little in the gap, making the endless sanding baths even closer to the blade nestle. This causes a particularly good, reproducible cut. This clinging of the endless sanding to the blade is done automatically, which has the advantage that even people with little experience in blade grinding are able to provide the blade with a good finish.

The endless abrasive baths used have a layer of suitable abrasive material on the blade-facing surface to effect grinding of the blade. The endless grinding baths have grooves extending in the drive direction and protruding webs, wherein at least one of the webs has the abrasive surface. In a preferred embodiment, all webs directed towards the blade have an abrasive surface.

In a particularly advantageous embodiment, the endless abrasive belt is configured as a base belt with strips applied in the longitudinal direction, in particular glued-on strips, these strips forming the webs. These strips consist for example of a film having a thickness in the range of, for example, 1/10 mm to 2 mm, wherein the film is firmly connected on one side with the baseband of the endless abrasive belt, and wherein the film on the other side has an abrasive surface or coated with an abrasive agent. This embodiment has the advantage that the endless abrasive belt can be produced very inexpensively by not having to introduce the grooves into the surface of the endless abrasive belt. The baseband and stripes could be in place of gluing _ _

For example, be connected by vulcanization. The endless abrasive belt can be produced in a variety of ways, for example also such that the endless abrasive belt is produced in a first process step with a continuous layer of abrasive material, and that the grooves are removed from the continuous layer of abrasive material in a second process step, for example, by milling, so that an endless grinding belt is formed with extending in the drive direction grooves and projecting webs.

The invention will be explained in more detail with reference to an embodiment. The figures show:

Fig. 1 is a perspective view of a grinder from the front; FIG. 2 shows a detailed view A of the grinding device shown in FIG. 1; FIG. Fig. 3 is a front view of the grinder from the rear; 4 shows a section through the grinding device shown in FIG. 3 along the section line B-B; Fig. 5 is a detail view C of the section shown in Figure 4; Fig. 6 is a detail view of the section shown in Figure 5; FIG. 7 is a detailed view D of the section shown in FIG. 4; FIG. Fig. 8 is a detail view from direction F of the converging abrasive belts shown in Fig. 1; 9 shows a front view of the grinding device from the rear with details regarding the adjusting device; 10 is a front view of the grinder from behind with swung-out abrasive belts.

Fig. 1 1 a section through a ground blade. _

Figure 1 shows a perspective view of the front and Figure 3 is a front view of the back of an embodiment of the grinding device 1. On the base 7 of a base plate 6, a first and a second drive and bearing device 4.5 are pivotally mounted, wherein the first and the second drive and

Bearing device 4.5 are arranged in the illustrated embodiment in opposite directions, and are arranged mutually symmetrically extending with respect to a plane perpendicular to the base plate 6 level. Each of the two drive and bearing devices 4, 5 serves to hold and drive a first endless abrasive belt 2 or a second endless abrasive belt 3 such that the endless abrasive belts 2, 3 converge at a tip angle α and form a gap S or a sanding edge S, respectively in the area where a blade can be sanded. Each drive and bearing device 4, 5 comprises two deflection rollers 4a, 4b, 5a, 5b, which are rotatably mounted in bearings 4d, 4f, 5d, 5f, the bearings 4d, 4f, 5d, 5f being spaced from a spacer 4c, 5c are held. As can be seen from FIG. 3, the grinding device 1 comprises two drive wheels 4e, 5e, which can be driven by a device (not shown). The drive wheel 4e or 5e is connected via a shaft 4k, 5k to the deflection roller 4b or 5b, in order to drive them and thereby to move the first or second endless grinding belt 2, 3 in the drive direction 2e, 3e.

FIG. 4 shows the grinding device 1 shown in FIG. 3 in a section along the section line BB. The housing of the bearings 4f, 5f is verschenkbar on the adjusting bushes 4m, 5m, that is, about a shaft 4k, 5k concentric axis of rotation, stored in the base 7. The - -

Guide roller 4b is connected via a common shaft 4k with the drive wheel 4e, said common shaft 4k is rotatably mounted in the bearing 4f. The same applies to the deflection roller 5b, which is connected via a common shaft 5k with the drive wheel 5e and rotatably mounted in the bearing 5f. The spacer 4c or 5c is fixed to the adjustment sleeve 4m; 5m connected and thus on the adjustment box 4m; 5m rotatably supported with respect to the sock 7, wherein the center of rotation substantially the course of the common shaft 4k; 5k corresponds. An adjusting lever 8 is, as also shown in FIG. 9, pivotably mounted on a fixed bearing 7a, wherein each adjusting bush 4m, 5m has a projecting pin 4g, 5g, which is mounted in a slot 8a, 8b of the adjusting lever 8. As shown in FIGS. 9 and 10, this arrangement has the result that the two drive and bearing devices 4, 5 can be pivoted in opposite directions by actuating the adjusting lever 8 in the direction of movement 8c, so that the angle α can be increased as shown in FIG is, or by pivoting back of the adjusting lever 8, as shown in Figure 9, the angle α is reduced in size. The adjusting lever 8 may have latching positions in order to easily set a predetermined angle α. However, the adjusting lever 8 can also be continuously adjustable so that a selectable angle α is adjustable as required.

The section C marked in FIG. 4 is shown enlarged in FIG. The endless grinding belt 2, 3 has grooves 2b, 3b and webs 2c, 3c running on its surface in the drive direction 2e, 3e, the drive direction 2e, 3e running perpendicular to the viewing plane in the illustrated view. The grooves 2b, 3b and webs 2c, 3c are mutually adapted as shown dimensioned and arranged so that the webs 2c of the first endless abrasive belt 2 can lie in the grooves 3b of the second endless abrasive belt 3, and conversely, the webs 3c of the first endless abrasive belt 3 in the grooves 2b of the second endless abrasive belt 2 may lie, or that the webs 2c, 3c , and grooves 2b, 3b can intermesh. Figure 5 shows this again in an enlarged view. At least one web 2c, 3c has an abrasive surface 2d, 3d. Preferably, all the webs 2c, 3c have an abrasive surface 2d, 3d, whereas the grooves 2b, 3b have no abrasive surface. As shown in Figure 6, the grooves 2b, 3b and webs 2c, 3c are preferably dimensioned such that the mutually facing surfaces do not touch. In addition, the grooves 2b, 3b and webs 2c, 3c are preferably configured so wide that adjacent webs 2c, 3c do not touch laterally. The first and second endless grinding belts 2, 3 are advantageously guided in such a way by the deflection rollers 4b, 5b, and has such geometrically configured grooves 2b, 3b and webs 2c, 3c, that the two endless grinding belts 2.3 at the in Figs. 5 and 6, or a section T located in this area, do not touch one another, but the webs 2c, 3c and grooves 2b, 3b come into contact with each other. This juxtaposition of webs 2c, 3c and grooves 2b, 3b has the consequence that forms a clean, well-defined grinding edge S between the two endless abrasive belts 2.3. The endless abrasive belt 2, 3 can, as shown in FIGS. 5 and 6, consist of a plastic strip, on the surface of which grooves 2b, 3b are excluded, so that the projecting webs 2c, 3c form. - -

The first and second endless abrasive belt 2, 3 has a contact surface 2f, 3f facing away from the abrasive surface 2d, 3d, which in an advantageous embodiment has a guide to precisely define the position of the endless abrasive belt 2, 3 with respect to the deflection roller 4b, 5b Hold position. Advantageously, this is achieved by the support surface 2f, 3f of the endless abrasive belt 2, 3 and the surface of the deflection roller 4b, 5b have a projection extending in the drive direction 2e, 3e, protruding guide or a matching matched recess. In the exemplary embodiment illustrated in FIGS. 5 and 6, the endless grinding belt 2, 3 has a protruding guide 2a, 3a designed as a web, whereas the deflecting roller 4a, 4b, 5a, 5b has a groove 4h, 5h adapted to the guide 2a, 3a having. Each endless abrasive belt 2, 3 could also have a plurality of mutually spaced webs 2 a, 3 a, so that the webs 2 a, 3 a are mutually spaced in the vertical direction in the view shown in FIG. The pulleys 4b, 5b would then have according to the webs 2a, 3a arranged in opposite directions grooves 4h, 5h, in which the webs 2a, 3a, come to rest. The guide 2a, 3a could also, as shown by dashed lines, laterally be arranged outside, so that they rest against the end face of the guide rollers 4b, 5b.

FIG. 2 shows the detail marked A in FIG. 1 in an enlarged representation. The two endless abrasive belts 2,3 are V-shaped in the grinding edge S, in which the two

Endlosschleifbänder 2.3 interlock by the grooves 2b, 3b and webs 2c, 3c come to lie one inside the other. The grooves 2b, 3b and webs 2c, 3c lie along a portion T into each other. In the illustrated embodiment, the second endless abrasive belt on the support surface 3f has a protruding Guide web 3a, which runs along the entire endless abrasive belt in the drive direction 3e. The guide web 3a is guided in a groove 5h of the guide roller 5b.

FIG. 7 shows an enlarged view of the detail denoted by D in FIG. The first endless sanding belt 2 with webs 2c and grooves 2b, guided by means of the guide 2a, rests on the deflection roller 4b. All webs 2 c are provided with an abrasive surface 2 d. In contrast to the embodiment of an endless sanding belt 2, 3 shown in FIGS. 5 and 6, the endless sanding belt 2 shown in FIG. 7 has a base belt with a flat surface, on which, in the illustrated embodiment, four thin strips 2g extending in the drive direction are arranged. These strips 2g consist for example of a film having a thickness in the range of, for example, 1/10 mm to 2 mm or a thickness in the range of, for example, up to 5 mm, wherein the film is firmly connected on one side with the baseband of the endless abrasive belt 2 , and wherein the film on the other side has an abrasive surface or is coated with an abrasive agent. This embodiment has the advantage that the endless abrasive belt 2 can be produced very inexpensively by not having to introduce the grooves into the surface of the endless abrasive belt 2. Instead, the surface of the base tape is provided with the thin strip, which is preferably made of plastic or metal. The strips form the webs 2d, and the space located between the strips form the grooves 2b. The grooves 2b are at least as wide as the webs 2d, so that the webs 2d could engage in the grooves 2b. Preferably, however, the grooves 2b are wider than the webs 2d, in particular such - -

that mutually interlocking grooves 2b and webs 2d do not touch laterally. Another advantage is the fact that such webs 2d may have a very small height, for example, a height of 2/10 mm.

FIG. 8 shows a section of the gap S visible in the viewing direction F in detail. The two endless grinding belts 2, 3 run together against the deflection rollers 4b, 5b in a V-shape. Where the webs 2c, 3c of the two endless abrasive belts 2, 3 cross, the grinding edge S is formed. A blade inserted into this sanding edge S can be sanded very easily and in particular uniformly, since the abrasive surfaces 2d, 3d are arranged uniformly and at a small distance in the direction of progression of the sanding edge S.

It may prove advantageous, as indicated in FIG. 1, to arrange a support device 41, 51 between the deflection rollers 4 a and 4 b or 5 a and 5 b, which effects a force on the bearing surface 2 f, 3 f of the endless grinding belts 2, 3, in order thereby to produce the endless grinding belts 2,3 in the V-shaped gap to bring each other closer, or to reduce the angle α spanned by the endless grinding belts 2.3.

It can also prove to be advantageous between the deflection rollers 4a and 4b or 5a and 5b a

Spreader 41,51, for example, to arrange an air-working suction device, which causes a tightening relation or suction on the support surface 2f, 3f of the endless abrasive belts 2.3, thereby further the endless abrasive belts 2.3 in the V-shaped gap each other - -

to pull apart, or in order to increase the angle α spanned by the endless abrasive belts 2.3.

The abrasive surface of the endless abrasive belt can be achieved in a variety of ways. Preferably, the endless abrasive belt made of a plastic, possibly reinforced with fibers. The endless abrasive belt could also comprise a fabric. The surface is provided with an abrasive agent, such as tungsten carbide, or hard ceramic material, or carbide and / or diamond and / or Borozon (Boron nitride, BN, in particular cubic boron nitride) and / or Edelkorunde and / or mixtures thereof.

FIG. 11 shows a longitudinal section through a blade 30 sharpened or ground with the grinding device according to the invention. When the blade 30 is inserted into the gap S, the two flexible endless grinding belts 2, 3 are pushed slightly to the side, perpendicular to the direction of movement 2e, 3e of the endless grinding belts 2 , 3, so that a blade is produced with slightly concave or curved side edges. Such a ground blade has particularly advantageous cutting properties. Such a cut is also called ballig cut.

Claims

- PERSONAL CLAIMS

1. Grinder (1), in particular for grinding and / or sharpening knives, comprising a first and a second driven endless abrasive belt (2,3) having an abrasive surface (2d, 3d), each endless abrasive belt (2,3) of a first and a second drive and bearing device (4,5) is guided and held such that the abrasive surfaces (2d, 3d) of the two endless abrasive belts (2,3) form a gap (S) for grinding a blade, and that the first and second drive and bearing device (4, 5) each comprise two deflection rollers (4a, 4b, 5a, 5b), against which the first or second endless grinding belt (2, 3) abuts, characterized in that the first and second endless grinding belts ( 2,3) on its abrasive surface (2d, 3d) in the drive direction (2e, 3e) extending grooves (2b, 3b) and

Webs (2c, 3c) has at least one web (2c, 3c) the abrasive surface (2d, 3d), and that the two endless abrasive belts (2,3) are arranged mutually extending, that the grooves (2b, 3b ) and webs (2c, 3c) of the two endless abrasive belts (2,3) along a section

(T) in the drive direction (2e, 3e) are mutually intermeshed.

2. Grinding device according to claim 1, characterized in that the grooves (2b, 3b) and webs (2c, 3c) are dimensioned such that the two endless abrasive belts (2,3) do not touch each other along the subsection (T). - -

3. Grinding device according to one of the preceding claims, characterized in that the first and the second endless abrasive belt (2,3) one of the abrasive surface (2d, 3d) facing away from support surface (2f, 3f), and that the endless abrasive belt (2,3 ) on the support surface (2f, 3f) has a in the drive direction (2e, 3e) extending over the support surface (2f, 3f) projecting guide (2a).

4. grinding device (1) according to claim 3, characterized in that the projecting guide (2a, 3a) as in the drive direction (2e, 3e) circumferential web is configured.

5. Grinder (1) according to one of the preceding claims, characterized in that at least one deflection roller

(4a, 4b, 5a, 5b) of each drive and bearing device (4,5) a

Guide means (4h, 5h) for guiding the endless abrasive belt (2,3).

6. Grinder (1) according to claim 5, characterized in that the guide means (4h, 5h) as one in the surface of the

Guide roller (4a, 4b, 5a, 5b) extending groove is configured, in which the above guide (2a, 3a) of the endless abrasive belt (2,3) is located.

7. Grinder (1) according to any one of the preceding claims, characterized in that the two drive and bearing devices (4,5) arranged mutually verschenkbar - -

are to change the angle α defined by the two abrasive surfaces (2d, 3d) of the two endless grinding baths (2,3) in the region of the gap (S).

8. Grinder (1) according to one of the preceding claims, characterized in that each drive and bearing device (4,5) comprises a deflection roller (4b, 5b), which are arranged spaced such that the portion (T) in the region of Pulleys (4b, 5b) runs.

9. Grinder (1) according to claim 8, characterized in that the two drive and bearing devices (4,5) are rotatably mounted about an axis which substantially with the axis of rotation (4k, 5k) of the corresponding guide roller (4b, 5b ) coincides

10. Grinder (1) according to claim 9, characterized in that between the deflection rollers (4b, 5b) a fixed bearing point (7a) is arranged, at which a

Adjusting lever (8) is pivotally mounted, and that each of the two drive and bearing devices (4,5) a

Engagement point (4g, 5g), which is connected to the adjusting lever (8) such that actuation of the adjusting lever (8) a opposite pivotal movement of the two drive and

Storage devices (4,5) causes. - -

1 1. Grinder (1) according to one of the preceding

Claims, characterized in that the drive and bearing device (4,5) between the pulleys (4a, 4b, 5a, 5b) on the endless abrasive belt (2,3) acting support or tightening device (41,51) to the from to change the angle α defined by the two abrasive surfaces (2d, 3d) of the two endless grinding baths (2, 3).

12. grinding device (1) according to one of the preceding

Claims, characterized in that the webs (2c, 3c) of the endless abrasive belt (2,3) are formed by a drive belt (2e, 3e) on a base belt of the endless abrasive belt (2,3) for each web (2c, 3c) ) is applied, and that the grooves (2b, 3c) are formed by the spaces between the bands (2g).

13. Grinder (1) according to claim 12, characterized in that the bands (2g) have a thickness in the range between 1/10 mm and 2 mm, preferably a thickness of 2/10 mm.

14 endless grinding belt (2,3) for a grinding device according to any one of the preceding claims, characterized in that the endless grinding belt (2,3) comprises a baseband, on which in the drive direction (2e, 3e) extending bands (2g) are applied, the webs (2c, 3c) form, and that by the between the webs (2c, 3c) resulting spaces -. -

Grooves (2b, 3b) are formed, and that the grooves (2b, 3b) are at least as wide as the webs (2c, 3c).

15 endless grinding belt (2,3) according to claim 14, characterized in that the bands (2g) have a thickness in the range between 1/10 mm and 2 mm, preferably a thickness of 2/10 mm.

16. Use of endless sanding belts (2,3) with in one

Drive direction (2e, 3e) extending grooves (2b, 3b) and

Webs (2c, 3c), wherein the webs (2c, 3c) have an abrasive surface (2d, 3d), for grinding and / or sharpening of

Knives.