WO2009083192A1

WO2009083192A1 - Method for sharpening cutting blades of cutting tools, and tool and substance therefor

Info

Publication number: WO2009083192A1
Application number: PCT/EP2008/010937
Authority: WO
Inventors: Ferdinand Likosar; Juliane Likosar
Original assignee: Ferdinand Likosar; Juliane Likosar
Priority date: 2007-12-21
Filing date: 2008-12-19
Publication date: 2009-07-09
Also published as: DE102007062998A1; DE102007062998B4; AT511167A5

Abstract

The invention relates to a method for sharpening at least one cutting edge (2) of at least one cutting blade (1) of a cutting tool, characterized by the following steps: a) placing the cutting blade (1) onto a microfiber cloth (9); b) spraying a substance comprising a solution of alcohol and oil combinations, particularly paraffins, onto the cutting edge (2), wherein simultaneously the region of the microfiber cloth (9) adjacent to the cutting edge (2) is also sprayed; c) pulling the microfiber cloth (9) having been sprayed with the substance along the cutting edge (2); and d) polishing the sharpened cutting edge (2) using the microfiber cloth (9) having been sprayed with the substance. The tool for sharpening at least one cutting edge (2) of at least one cutting blade (1) of a cutting tool is a microfiber cloth (9) consisting of fibers that are approximately 10 micrometers thick and are woven such that fiber bundles have multiple free loops and free fiber ends on the surface thereof. The substance (20) is a solution comprising alcohol and oil combinations, wherein in the oil combinations particularly paraffin oil is dissolved in alcohol. The object of the invention is to refine a method for sharpening cutting edges of cutting blades of cutting tools such that a particularly simple and operationally safe method may be carried out, and the associated tool and the substance are readily available and can be utilized in a simple manner.

Description

Method for sharpening cutting edges of cutting tools as well

Tool and substance for this

The invention relates to a method for sharpening cutting blades of cutting tools according to the preamble of patent claim 1, and a tool for sharpening cutting blades according to the preamble of claim 6 and an associated substance according to the preamble of claim 10 for carrying out this method.

The invention relates in particular to the sharpening of the cutting blades of scissors, in particular hairdressing scissors, secateurs, household scissors, knives for household use and everyday use.

As the cutting edge of the knife becomes more or less worn and dull as a result of use, periodically recurring sharpening processes are necessary. These differ depending on the polished section and material of the blade, as well as the degree of wear.

By use, the burr, ie the pointed edge of the cutting edge, is initially set at a microscopic level on many metal knives. However, the cutting action unfolds on the ridge, so it is severely affected by uneven burrs. With a sharpening steel you can now raise the ridge again. For this you pull the knife at an acute angle over the hard metal of the sharpening steel, this can be done "against" or "with" the stroke (the sharp blade side). No metal is removed, only the burr is directed. Consequently, the knife already needs a sufficient cut before. If the blade is too worn, i. The profile of the blade is no longer the original profile, you have to grind the knife again.

The sharpening steel is used for sharpening knives. The sharpening steel is a round or oval rod made of high-quality, very hard steel. This method of sharpening does not, in principle, remove any steel from the blade, so the blade will not be ground as when using a grindstone. Instead, microscopically small bumps on the blade are re-erected by whetting, so that it again forms a straight line and therefore can cut better. A sharpening steel is only really effective if the blade in principle already has a sufficiently good finish, but on the small incisions have been created by cutting, which are raised by the sharpening steel again.

If the use of a sharpening steel no longer produces the desired sharpness, the blade must be sharpened again with the help of a whetstone or the like, in which case some steel is removed from the blade again.

Unlike the whetstone, the blade is not ground, so no steel removed, but only directed. The sharpening steel is used several times during the use of the knife.

When making the scissors, the blades are polished or honed at the end.

This polishing or honing process is also used to peel knives. Instructions are known in which e.g. Finest polishing pastes mixed with methylated spirits are applied to a leather belt on which the cutting edge is removed.

It is also known that razors on a leather belt (so-called strop) are deducted.

To keep the knife sharp for the daily shave, it is sufficient to peel off the strop. This consists of two sides, one has a chromium oxide layer (green) and the other is not treated, or is rubbed with a white or clear antiseptic paste. The razor is removed before each shave on the non-green side. This serves to raise the sensitive edge again. The removal straps usually have a hemp back, which also serves to erect the cutting edge. Thereafter, further deducted on the leather side.

When shaving, the blade bends slightly by the contact with the hair. If you were to pull off the razor directly after shaving, you would polish off these places and you get in the long run a jagged cutting edge, which must be sharpened more often on the stone. If the knife has become a little duller, then you change to the green side, because this site has more removal than the other.

Smooth handling of shears / cutting geometry

Good scissors should be well cared for to last a long time. If a pair of scissors is rough and heavy, it often does not need to be reground immediately. Dust, lint and cutting debris should be removed from the cutting edges and scissor blades. The screw connection should not be loosened. Every now and then you should give a small drop of caring oil in the screw slot and the intermediate. So the scissors stay smooth.

An ideal movement ensures a soft opening and closing and a gentle cut.

The scissors will be chosen in every desired position and in each one

Cutting angle have optimal cutting performance, and the edge sharpness is maintained. The change of the mobility also causes a change of the

Cutting performance.

In summary, it should be noted that:

1.) The burr is directed.

2.) The cut edge is honed or sanded.

3.) By the recordings of fat (leather straps) the pores are closed and a smooth running is achieved. In the prior art it is known to clean basically hard surfaces (DE 10 2005 036 339 A1 or DE 10 2005 034 977 A1).

However, the disadvantage of the known cleaning agents is that no sharpening effect is produced, but only dirt particles are removed from the surfaces to be cleaned.

The invention has the object of providing a method for sharpening cutting blades of cutting tools of the type mentioned in such a way that a particularly simple and more reliable method can be performed and the associated tool is well available and can be used in a simple way.

To achieve the object, the invention is characterized by a method according to the subject of claim 1.

A tool used for the method consists essentially of a so-called microfiber cloth. This is a cleaning cloth whose fabric has a special structure. On the one hand, it consists of fine fibers, which are less than half as thick as cotton at about 10 microns. On the other hand, the cloth is woven so that the fiber bundles on the surface have many free loops and free fiber ends. Unlike normal cleaning cloths, the fine fibers themselves and not the fiber bundles contribute to the cleaning process.

Here it is preferred if the fibers are made of a hard plastic material, e.g. Polyamide and polyester. These are fiber-plastic mixtures which form a particularly hard surface and thus make the microfiber cloth usable for the first time as a tool for sharpening cutting blades of cutting tools.

It has been found, although these fiber bundles are very fine, they have a strong abrasive effect and this strong abrasive effect is now used according to the invention for sharpening cutting blades of cutting tools. A substance which is used in conjunction with said tool (microfiber cloth) for sharpening cutting blades, is preferably a solution of alcohol and oil combinations, wherein in the oil combinations in particular paraffin oil is dissolved in alcohol.

The method for sharpening cutting blades of cutting tools is now characterized by the following method steps:

1.) placing the cutting blades of a sharpening cutting tool on a microfiber cloth.

2.) spraying a solution of alcohol and oil combinations, in particular paraffins on the cutting edges and the cutting blades of the cutting tool, at the same time also areas of the microfiber cloth are sprayed.

3.) Traverse the microfibre cloth, which is sprayed with the substance, along the cutting blades to be sharpened. 4.) Polishing the sharpened cutting blades with the partially wetted

Microfiber cloth.

With the mentioned method steps, a completely new method for sharpening cutting blades of cutting tools is proposed, because during the aforementioned method steps, the following effects occur:

1.) By spraying with a solution of alcohol and oil combinations, the cutting edge is cleaned pore-deep of deposits. The

Cutting geometry can be restored to its optimum shape (especially at

Scissors) to each other.

2.) The addition of wax or oil combinations causes a closing of the microscopic pores and increases the sliding properties in addition.

(see leather straps)

3.) The subsequent polishing with the microfibre cloth, the surface is polished or the burr in the microscopic area (similar to a sharpening steel or leather) again directed. It is particularly crucial to use abrasive, abrasive cloths. Microfiber cloths in particular have a removing and polishing effect in the microscopic range due to their polyester-polyamide blend.

Namely, in the first process step, there is the advantage that the cutting blade and the cutting edges of the cutting tool strike both the spray of the substance to be used and the underlying microfibre cloth, which has the advantage that the microfiber cloth is also sprayed therewith and later , in the final polishing step the oil components contained in the microfibre cloth can be used for the polishing process the same.

Further, there is the advantage that with the simultaneous spraying of the microfiber cloth and the cutting blades lying thereon, the microfiber cloth is already prepared for the subsequent honing process. This means that the paraffin particles dissolved in the alcohol in the spray substance are placed on the ground ridges of the cutting edge and settle in the ridge depressions and, in some cases, also grater elevations. Incidentally, all surfaces of the cutting blades touched during the cutting process are also provided with this paraffin coating. This results in the significant advantage that the ridge depressions and burr bends are partially closed by the attachment of the paraffin coating and bridged by relatively hard paraffin particles depositing there.

Now, in the further process step described above, the microfiber cloth is guided with its hard abrasive fibers along the cutting edge, the unexpected effect that the fiber fibrils of the microfiber cloth are suitable for erecting bent parts of the cutting edge (hereinafter also called burr bends) and in the Rebuild the plane of the cutting edge.

This closes the sharp cuts previously made in the cutting edge by the burr bends, because the burr bends are again up in the cutting edge Cutting edge are deformed into it and thereby the unfavorable and the way of working restricting nicks are closed in the cutting edge.

The microfibre cloth also has a slight honing effect on the cutting edge, so slightly removing metal particles from the cutting edge that protrude beyond the cutting edge.

As a result, the cutting geometry of the scissors becomes smooth, i. the surfaces of the cutting blades of a pair of scissors which come into contact during the cutting process are lubricated by the application of oil and the subsequent application of paraffin and run smoothly past one another. Furthermore, it is preferred if the spray jet is also applied to the scissors joint of a pair of scissors to be sharpened, because there too the oil penetrates and deposits paraffin particles. This also serves to lubricate the scissors joint. When using paraffin particles there is not the disadvantage - as is the case when lubricating with oil substances - that dirt particles subsequently bind to this oil film. By spraying a paraffin-alcohol mixture, the scissors joint is thus simultaneously cleaned by the alcohol components and the subsequent paraffin film serves as lubrication in the scissors joint, without the risk that in a previously existing oil film this binds the penetrating dirt particles in itself. This does not happen with a paraffin layer.

The subject of the present invention results not only from the subject matter of the individual claims, but also from the combination of the individual claims with each other.

All information and features disclosed in the documents, including the abstract, in particular the spatial design shown in the drawings, are claimed to be essential to the invention insofar as they are novel individually or in combination with respect to the prior art.

In the following the invention will be explained in more detail with reference to drawings showing only one embodiment. Here are the drawings and its description further features essential to the invention and advantages of the invention.

Show it:

Figure 1: Schematisiert an unprepared and contaminated, and unsharpened cutting edge of a cutting blade in a greatly enlarged view

Figure 2: The cutting blade of Figure 1 after a first

step

Figure 3: The cutting blade of Figure 2 for another

Step 4 and 5: The representation of the erection of the burr bends by a

abrasive cloth

Figure 6: Schematisiert in perspective representation of the implementation of the method.

For reasons of simplification, the term grinding cloth 9 is used in the following description as a synonym for microfiber cloth, wherein it should also be shown that the microfiber cloth shows both an absorbent effect due to capillary action in the microfiber fibrils, as well as an abrasive effect, which means that the Hard microfibers exert a grinding action on metal parts.

In Figure 1, a used cutting blade 1 is shown, which is to be sharpened. The cutting edge 2 in this case has a plurality of ridge depressions and intermediate heel elevations. There are also burr bends 5 are present, which means that parts of the cutting edge are undesirably bent out of the plane of the cutting edge down and here form the mentioned burrs 5. Likewise, a plurality of dirt particles 6 have settled on the cutting edge 2 and there are also cutting particles between them 7, which originate from substances that have been cut with the cutting blade 1.

FIG. 2 shows, as a first method step in conjunction with FIG. 6, that when spraying a spray jet 18 from a spray nozzle 19 onto the cutting blade 1, wax particles 8 initially deposit on the surface of the cutting blade 1 and thus also on the cutting edge 2. These wax particles 8 (drawn as rectangular parts in an enlarged view) lie both in the burr depressions 3 and in the burr elevations 4 and wet the entire surface of the cutting edge 2.

At the same time, it can be seen that the dirt particles 6 and the cutting particles 7 are dissolved by the alcohol in the spray substance 20. In the next method step according to FIG. 3, the grinding cloth 9 according to the invention is now guided over the cutting edge 2 in the direction of the arrow 10. It consists of fiber fibrils 11, which are cross-interwoven with each other and exert a strong capillary force induced suction in the direction of arrow 12 of loosened dirt particles 6 and cutting particles 7 due to the microfiber structure.

By the movement of the grinding cloth 9 - which is electrically insulating - takes place at the same time an electrostatic charge of the grinding cloth 9, which due to electrostatic attraction of the soluted by the alcohol particles 6 and 6 particles are still added to the internal structure of the grinding cloth 9. In addition to the absorption effect by capillary action, electrostatic charging of the grinding cloth 9, in particular of the areas of the microfiber cloth which were not hit by the spray jet 18, therefore also occurs. These areas remain dry, and because they are dry, they can electrostatically charge during the movement of the abrasive cloth 9 in the direction of arrow 10 and here additionally a transfer of excess wax particles 8 in the direction of arrow 13 and additionally a transfer of loosely adhering dirt particles 6 and cutting particles. 7 effect on the abrasive cloth 9 due to electrostatic attraction. Thus, there are two separate transfer or Abtragungsvorgänge held by the grinding cloth 9, which is moved in the direction of arrow 10 along the cutting edge 2.

Due to the abrasive effect of the fiber fibrils 11, first the ridge recesses 3 close because they are ground, and on the other hand there is a ridge deformation, as shown in FIGS. 4 and 5. The burrs 5 shown in Figure 4, which are bent out of the plane of the cutting edge 2, are erected in the direction of arrow 14 through the hard Faserfibrillen 11 of the grinding cloth 9, which is guided along in the direction of arrow 10 there, so that the shape obtained as it is shown in FIG. The erected ridges 15 shown there are then again in the plane of the cutting edge 2, which was done thanks to the grinding cloth 9.

FIG. 6 shows an application example of a method according to the invention. There it can be seen that the grinding cloth 9 is designed in a plane and the scissors blades to be ground 16, 17 of a pair of scissors are opened in order to spray the cutting edges 2 of the scissor blades 16, 17 as large as possible with a spray jet 18. It is important that the spray jet 18 of the spray substance 20 also hits a part of the surface of the grinding cloth 9 in order to also wet this surface with the spray substance 20. Therefore, they bring in this area dissolved in alcohol wax particles 8 and impregnate the grinding cloth 9 in this area.

It is then optimally equipped for the polishing process, because the wetted with the spray substance 20 areas of the abrasive cloth simultaneously polish the surfaces of the cutting edge 2 of Figure 3 and lead to the aforementioned effects, namely that the burrs 5 are erected and at the same time the ridge depressions be closed and all wetted surfaces are additionally occupied with the wax particles 8.

In this case, it is preferable if the connecting screw 21, which forms the scissors joint 22, is also hit by the spray substance 20. With the given technical teaching of a novel method, a tool used for this purpose (abrasive cloth 9 and spray substance 20), the effect is achieved that it is now possible for the first time, without grindstone, without grinding steel or other tools at the same time the cutting edge 2 of cutting blades 1, 17, 18 to sharpen, polish and impregnate with a wax film 8. This is done practically in a single operation, which was not yet known.

The said spray substance 20 consists essentially of a mixture of oils, waxes and alcohol.

drawing Legend

1 cutting blade

2 cutting edge

3 ridge recess

4 Grater increase

5 burr bending

6 dirt particles

7 cutting particles

8 wax particles

9 grinding cloth

10 arrow direction

11 fiber fibrils

12 arrow direction

13 arrow direction

14 arrow direction

15 Erected ridge

16 scissor blade

17 scissor blade

18 spray

19 spray nozzle

20 spray substance 1 connecting screw 2 scissors joint

Claims

claims

I. Method for sharpening at least one cutting edge (2) of at least one cutting blade (1) of a cutting tool, characterized by the following method steps: a) placing the cutting blade (1) on a microfiber cloth (9); b) spraying a substance (20) of a solution of alcohol and oil combinations, in particular paraffins, on the cutting edge (2), wherein at the same time also the area of the microfiber cloth (9) adjoining the cutting edge (2) is sprayed; c) drawing along the microfiber cloth (9), which is sprayed with the substance (20) along the cutting edge (2); d) polishing the thus sharpened cutting edge (2) with the microfiber cloth (9) sprayed with the substance (20).

2. The method according to claim 1, characterized in that in step 1 b) the substance (20) is also sprayed onto the cutting blade (1).

3. The method according to claim 1 or 2, characterized in that in step 1 b) the substance (20) is also sprayed on to the cutting blade (1) adjacent region of the microfiber cloth (9).

4. The method according to any one of claims 1 to 3, characterized in that in step 1c) with the substance (20) sprayed microfiber cloth (9) along the cutting blade (1) is pulled.

5. The method according to any one of claims 1 to 4, characterized in that in step 1d) and the cutting blade (1) with the substance (20) sprayed microfibre cloth (9) is polished.

6. Tool for sharpening at least one cutting edge (2) of at least one cutting blade (1) of a cutting tool, in particular for carrying out the method according to claims 1 to 5, characterized in that the tool is a microfiber cloth (9).

7. Tool according to claim 7, characterized in that the microfiber cloth (9) consists of fibers (11) which are about 10 microns thick.

8. Tool according to claim 7 or 8, characterized in that the fibers (11) of the microfiber cloth (9) are woven so that fiber bundles on the surface have many free loops and free fiber ends.

Tool according to one of claims 7 to 9, characterized in that the fibers (11) of the microfibre cloth (9) are made of a hard plastic material, e.g.

Polyamide and polyester exist.

10. substance for sharpening at least one cutting edge (2) at least one cutting blade (1) of a cutting tool, in particular for carrying out the method according to claims 1 to 5, characterized in that the substance (20) is a solution of alcohol and oil combinations, wherein In particular, paraffin oil is dissolved in alcohol in the oil combinations.

11. A substance according to claim 10, characterized in that the substance contains polishing additives.