EP2014414A1 - Belt grinding device for sharpening knives - Google Patents

Abstract

The knife sharpener (1) has two continuous abrasive belts (2,3) in a drive mounting (4,5) so that their abrasive surfaces (2d,3d) form a gap (S) between them to sharpen the knife blade. The belts pass round two deflection rollers (4a,4b,5a,5b). In the drive direction (2e,3e), the belt surfaces have grooves and bars where at least one bar has an abrasive surface. Where the belts meet, the grooves and bars lie within each other over a part-section.

Description

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

The document US 3,775,913 discloses a sander 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 endless abrasive belts perpendicular to their course form a relatively deep and defined designed grinding surface or a defined gap, so that the knife can be ground 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 with 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 has an abrasive surface on the other side 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.

Fig. 1

eine perspektivische Ansicht eines Schleifgerätes von Vorne;

Fig. 2

eine Detailansicht A des in Figur 1 dargestellte Schleifgerätes;

Fig. 3

eine Frontansicht des Schleifgerätes von Hinten;

Fig. 4

ein Schnitt durch das in Figur 3 dargestellte Schleifgerät entlang der Schnittlinie B-B;

Fig. 5

eine Detailansicht C des in Figur 4 dargestellten Schnittes;

Fig. 6

eine Detailansicht des in Figur 5 dargestellten Schnittes;

Fig. 7

eine Detailansicht D des in Figur 4 dargestellten Schnittes;

Fig. 8

eine Detailansicht aus Richtung F der in Figur 1 dargestellten, zusammenlaufenden Schleifbänder;

Fig. 9

eine Frontansicht des Schleifgerätes von Hinten mit Details bezüglich Verstellvorrichtung;

Fig. 10

eine Frontansicht des Schleifgerätes von Hinten mit ausgeschwenkten Schleifbändern;

Fig. 11

ein Schnitt durch eine geschliffene Klinge.

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

Fig. 1

a perspective view of a grinder from the front;

Fig. 2

a detailed view A of in FIG. 1 Grinder shown;

Fig. 3

a front view of the grinder from the rear;

Fig. 4

a section through the in FIG. 3 grinder shown along the section line BB;

Fig. 5

a detailed view C of in FIG. 4 illustrated section;

Fig. 6

a detailed view of the in FIG. 5 illustrated section;

Fig. 7

a detailed view D of in FIG. 4 illustrated section;

Fig. 8

a detail view from direction F of in FIG. 1 illustrated, converging abrasive belts;

Fig. 9

a front view of the grinder from the rear with details regarding adjusting device;

Fig. 10

a front view of the grinder from the rear with swung-out abrasive belts;

Fig. 11

a section through a ground blade.

FIG. 1 shows in a perspective view the front and FIG. 3 On the base 7 of a base plate 6, a first and a second drive and bearing device 4,5 are pivotally mounted, the first and the second drive and bearing device 4,5 in the illustrated embodiment gegengleich same are arranged, and arranged mutually symmetrically with respect to a plane perpendicular to the base plate 6 extending 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 one

Endlosschleifbandes 3 such that the endless abrasive belts 2.3 converge α at a peak angle and form a gap S or a sanding edge S, or in the area in which a blade can be ground. 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. How out 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 that in FIG. 3 grinder 1 shown 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 deflection roller 4b is connected via a common shaft 4k to the drive wheel 4e, this common shaft 4k being 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 in FIG. 9 shown, pivotally mounted on a fixed bearing 7a, each Verstellbüchse 4m, 5m has a projecting pin 4g, 5g, which is mounted in a slot 8a, 8b of the adjusting lever 8. This arrangement has, as in the FIGS. 9 and 10 As a result, the two drive and bearing devices 4, 5 can be pivoted counter to each other by actuating the adjusting lever 8 in the direction of movement 8c, so that as in FIG FIG. 10 represented, the angle α is increased, or by pivoting back of the adjusting lever 8, as in FIG. 9 represented, the angle α is reducible. 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 in FIG. 4 marked section C is in FIG. 5 shown enlarged. 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. As shown, the grooves 2b, 3b and webs 2c, 3c are dimensioned and arranged in such a way that the webs 2c of the first endless sanding belt 2 can lie in the grooves 3b of the second endless sanding belt 3, and vice versa the webs 3c of the first endless sanding belt 3 in the 2 b of the second endless abrasive belt 2 may lie, or that the webs 2 c, 3 c, and grooves 2 b, 3 b may intermesh. FIG. 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 in FIG. 6 the grooves 2b, 3b and webs 2c, 3c are preferably shown in such a way dimensioned so 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 belt 2, 3 is 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 abrasive belts 2.3 at the in the FIGS. 5 and 6 represented point or a located in this area subsection T do not touch each other, the webs 2c, 3c and grooves 2b, 3b, however, come to lie one inside the 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 in the FIGS. 5 and 6 shown, consist of a plastic strip, on the surface 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 in the FIGS. 5 and 6 illustrated embodiment, the endless abrasive belt 2.3 a projecting, designed as a web guide 2a, 3a, whereas the guide roller 4a4b, 5a, 5b, a corresponding to the guide 2a, 3a has adapted groove 4h, 5h. 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 in FIG. 1 Enlarged view with A in an enlarged view. The two endless sanding belts 2, 3 run in a V-shape into the sanding edge S, in which the two endless sanding belts 2, 3 mesh with one another, in that the grooves 2b, 3b and webs 2c, 3c mutually come to lie one inside the other. The grooves 2b, 3b and webs 2c, 3c lie along a partial section T in each other. In the illustrated embodiment, the second endless abrasive belt on the support surface 3f a projecting 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 the in FIG. 1 with D designated section in an enlarged view. 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 2c are provided with an abrasive surface 2d. Unlike in the FIGS. 5 and 6 illustrated embodiment of a continuous abrasive belt 2,3, the in FIG. 7 illustrated endless sanding belt 2 a base belt with a flat surface, on which in the illustrated embodiment, four running in the drive direction, thin strips 2g 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, wherein the film is firmly connected on one side with the baseband of the endless abrasive tape 2, and wherein the film on the other side of an abrasive Has surface or with a abrasive agent is coated. 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. 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 visible in the viewing direction F gap S 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, as in FIG. 1 indicated to be advantageous between the pulleys 4a and 4b and 5a and 5b to arrange a support device 41,51, which causes a force on the support surface 2f, 3f of the endless abrasive belts 2,3, thereby the endless abrasive 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 may also prove to be advantageous between the pulleys 4a and 4b and 5a and 5b, a spreading 41,51, for example, to arrange a suction device working with air, which causes a suit or suction relationship on the support surface 2f, 3f of the endless abrasive belts 2.3 to thereby the endless abrasive belts 2,3 in the V-shaped gap to pull each other further apart, or 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 and / or Edelkorunde and / or mixtures thereof.

FIG. 11 shows a longitudinal section through a sharpened or ground with the inventive grinding blade 30. When inserting the blade 30 in the gap S, the two flexible endless abrasive belts 2.3 are slightly pushed aside, perpendicular to the direction of movement 2e, 3e of the endless abrasive belts 2.3, so 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 (16)

Grinding apparatus (1), in particular for grinding and / or sharpening knives, comprising a first and a second driven endless grinding belt (2,3) with an abrasive surface (2d, 3d), each endless grinding belt (2,3) being guided by a first or a second grinding belt 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) forming a gap (S) for grinding a blade, characterized in 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, that the first and second endless grinding belts (2, 3, ) on the abrasive surface (2d, 3d) in the drive direction (2e, 3e) extending grooves (2b, 3b) and webs (2c, 3c), that at least one web (2c, 3c), the abrasive surface (2d, 3d) has, and that the two endless abrasive belts (2,3) in such a way mutually are arranged running, that the grooves (2b, 3b) and webs (2c, 3c) of the two endless abrasive belts (2,3) along a portion (T) in the drive direction (2e, 3e) are mutually inter-related. Grinding apparatus 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). Grinding machine 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) in the drive direction (2e, 3e) extending over the support surface (2f, 3f) projecting guide (2a). Grinding device (1) according to claim 3, characterized in that the projecting guide (2a, 3a) is configured as a web which rotates in the drive direction (2e, 3e). Grinding device (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) has guide means (4h, 5h) for guiding the endless abrasive belt (2, 3). Grinding apparatus (1) according to claim 5, characterized in that the guide means (4h, 5h) is designed as a in the surface of the guide roller (4a, 4b, 5a, 5b) extending groove in which the projecting guide (2a, 3a) the endless abrasive belt (2,3) is located. Grinding device (1) according to 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). Grinding device (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 at a distance such that the subsection (T) in the region of the deflection rollers ( 4b, 5b). Grinding apparatus (1) according to claim 8, characterized in that the two drive and bearing devices (4,5) are rotatably mounted about an axis which coincides substantially with the axis of rotation (4k, 5k) of the corresponding guide roller (4b, 5b) Grinding device (1) according to claim 9, characterized in that between the deflection rollers (4b, 5b) a fixed bearing point (7a) is arranged, on which an adjusting lever (8) is pivotally mounted, and that each of the two drive and bearing devices ( 4.5) has a point of engagement (4g, 5g) which is connected to the adjusting lever (8) such that actuation of the adjusting lever (8) causes a counter-rotating pivoting movement of the two drive and bearing devices (4,5). Grinder (1) according to one of the preceding claims, characterized in that the drive and bearing device (4,5) acting between the guide rollers (4a, 4b, 5a, 5b) on the endless abrasive belt (2,3) supporting or tightening device (41, 51) in order to change the angle α defined by the two abrasive surfaces (2d, 3d) of the two endless grinding baths (2, 3). Grinding apparatus (1) according to any one of the preceding claims, characterized in that the webs (2c, 3c) of the endless abrasive belt (2,3) are formed by a base belt of the endless abrasive belt (2,3) for each web (2c, 3c ) in the drive direction (2e, 3e) extending band (2g) is applied, and that the grooves (2b, 3c) through the spaces between the bands (2g) are formed. Grinding apparatus (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. Endless grinding belt (2,3) for a grinding device according to one of the preceding claims, characterized in that the endless grinding belt (2,3) comprises a base belt, on which in the drive direction (2e, 3e) extending bands (2g) are applied, the webs (2c , 3c), and that grooves (2b, 3c) are formed by the spaces between the webs (2c, 3c). Endless abrasive 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. Use of endless abrasive belts (2, 3) with grooves (2b, 3b) and webs (2c, 3c) running in a drive direction (2e, 3e), the webs (2c, 3c) having an abrasive surface (2d, 3d), for grinding and / or sharpening knives.

Images