JPH0347813Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a knife sharpener using a disc chip as a sharpening blade.

<Prior Art> An example of a manual knife sharpener using a conventional disc tip is shown in FIG. 1 is a plan view, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is a disk chip diagram. When in use, hold the grip handle 9 of the main body with your left hand, insert the blade base of the knife held in your right hand between the disc tips 1, and pull it toward you to attach the blade to the knife. A set of two bearing shafts 2 installed in parallel, each having a large clearance of 1 to 3 mm in the axial direction and 0.30 to 0.50 mm in the radial direction, and several disk chips 1 and washers 3 are set alternately. It is.

<Problem to be solved by the invention> In such a conventional product, when inserting the knife between the disc tips and pulling it, the disc tip 1 and washer 3
As shown in Figure 4, the direction in which the knife is pulled (direction of the arrow)
The structure was such that the edge 4 of the disk tip became a cutting blade to sharpen the knife. However, in this method, as shown in FIGS. 5 and 6, when the disc chip 1 falls down, the hole 6 of the disc chip comes into contact with the receiving shaft 2 in an elliptical shape, so the area of the contact part 5 is small. The disc chip was in a very unstable state, causing chatter and vibration, making it impossible to polish it smoothly and sharply.

As an example of a conventional product, as shown in Fig. 7, a disc chip 1 with a relief angle on the outer periphery is installed approximately at right angles to the bearing shaft 2 with almost no clearance even if it does not fall down, and the circular There are some structures that allow sharpening without the tip 1 falling over, but the reaction force on the outer periphery of the disk tip generated by moving the knife acts in the direction of the blade shaft, so the cutting edge of the disk tip 1 does not fall over. It repeatedly slips and bites against the blade, causing chattering vibrations.

<Means for Solving the Problems> The present invention improves the drawbacks of the conventional knife sharpeners and provides a knife sharpener which has an extremely simple structure and can sharpen without chatter vibration.

<Operations and Examples> In order to achieve the above objectives, the present invention has the following basic structure. An embodiment of the present invention will be described with reference to the drawings. In a knife sharpener whose sharpening blade is a disk tip having a circular hole, the disk tip is fitted on an inner surface determined by the axial centers of two receiving shafts fitted at approximately right angles, At the same time, the receiving shafts of the disk chips are tilted in a direction in which they are enlarged by a predetermined angle θ1 with respect to the direction in which the receiving shafts of the cutting tool engage, and at the same time, the plane determined by the axial centers of the two receiving shafts is tilted toward the cutting tool. At a predetermined angle θ, the receiving shaft of the disc chip is attached to the sharpening machine with the receiving shaft of the disc chip tilted in a direction in which the receiving shaft of the disc chip is lowered by a predetermined angle θ2 with respect to the horizontal plane of the sharpener.
This knife sharpener is characterized in that 1 and θ2 are respectively 20 degrees to 30 degrees.

8 is a plan view of the first embodiment of the present invention, FIG. 9 is a front view of FIG. 8, and FIG. 10 is a right side view of FIG. 8. In this embodiment, the main body 8 has a cutter insertion groove 7, and on both sides of the cutter insertion groove, a disk tip 1 sandwiched between washers 3 in a disk tip set groove 10 is inserted into the main body via a receiving shaft 2. It is installed at 8. The receiving shafts 2, into which the disc tip 1 is fitted approximately at right angles, are mutually separated by a predetermined angle θ1 so that the receiving shafts of the disc chips are spread out in the direction in which the cutter is drawn within a plane determined by the centers of the two shafts. The plane including the axial centers of the two receiving shafts 2 is tilted at a predetermined angle θ2 so that the receiving shaft of the disc tip is lowered in the direction in which the blade is further pulled with respect to the horizontal plane of the sharpener.
θ1 and θ2 are each 5
The range should be between 70 degrees and 70 degrees. Since the predetermined angle θ1 becomes a rake angle from the lateral direction with respect to the cutting edge of the knife when actually sharpening the knife, the predetermined angle θ1 will be referred to as the lateral rake angle θ1 hereinafter.

Similarly, since the predetermined angle θ2 is the rake angle in the axial direction of the cutter, the predetermined angle θ2 will be hereinafter referred to as the front rake angle θ2. Next, the clearance between the inner diameter hole 6 of the disc chip and the receiving shaft 2 is reduced to 0.05 to 0.10 mm, and the receiving shaft 2 and the disc chip 1 are fitted at approximately a right angle. This means that a small amount of tilting will also occur in the clearance.

Further, the clearance between the width of the disc chip set groove 10 and the thickness of the disc chip 1 and the washer 3 is as small as 0.1 to 0.5 mm, and the disc chip is made of cemented carbide.

One disc chip 1 each serving as a sharpening blade was installed so that their outer circumferences slightly overlapped, and furthermore, the central axes of the disc chips 1 were set at a side rake angle θ1 and a front rake angle θ2 of 25 degrees, respectively. ing. There is a clearance between the inner diameter hole 6 of the disc tip 1 and the shaft 2 that is sufficient to allow the disc chip 1 to rotate so that the entire circumference of the disc chip 1 can be used as a cutting edge.
The diameter is only 0.05 to 0.10 mm, so when pulling the knife, the disc tip 1 hardly tilts against the bearing shaft 2, and the inner diameter hole 16 of the disc chip 1 and the bearing shaft 2
It has a large contact area and is mechanically stable.
Also, the width of the set groove 10 relative to the thickness of the disc tip 1 and the washer 3 has a slight clearance as well.
Since the width is 0.1 to 0.5 mm, the supporting washer 3 is in plane contact with the set groove 10, so it is very stable against the load when sharpening the knife.

When in use, the blade of the knife can be polished by gripping the grip handle 9 of the main body with the left hand, inserting the blade base of the knife held in the right hand between the disc tips and gently pulling it towards you while pressing lightly. The above embodiment is just an example of the present invention, and the disc chips 1 need not be arranged one on each side, but may have several different diameters arranged side by side, and the side rake θ1 and front rake angle θ2 do not have to be the same on the left and right sides. Further, as described above, the present invention is characterized by the mutual relationship and mounting structure between the disc chip 1 and the receiving shaft 2, and the shape of the main body is not particularly limited.

The first purpose of this invention is to attach a rake angle θ1 to the disc tip, and by adding a side rake angle θ1, the P1 generated on the outer periphery of the disc tip when pulling the knife is reduced to the tip of the knife as shown in Figure 12. Because it works in a state where it pinches the material, stable polishing is possible. Also, this invention is the first
Disk tip 1 with side rake angle θ1 as shown in Figure 1
Furthermore, as shown in FIG. 10, a front rake angle θ2 is also added. Furthermore, Fig. 13 shows the left disc tip 1 when only the side rake angle θ1 is added without adding the front rake angle θ2 in Fig. 9.
This is a reference diagram when viewed from the right side direction (the direction in which the knife is applied is from left to right).
1 appears slightly tilted in the direction opposite to the pulling direction of the cutter with respect to the perpendicular to the pulling direction of the cutter, and in this state, the disc tip 1 easily bites into the blade of the cutler, and the resistance when pulling the cutter is large.

However, as shown in Fig. 14 of the present invention, the front rake angle θ
By adding 2, the ridge line 11 appears to be tilted greatly in the direction of pulling the knife with respect to the perpendicular line in the direction of pulling the knife.
In addition, since the length of the ridge line 11 becomes longer, the phenomenon of biting into the blade of the cutter is eliminated, and appropriate slippage occurs, allowing the cutter to be drawn smoothly even with a small force.

As described above, in the present invention, smooth polishing can be achieved by setting the side rake angle θ1 and the front rake angle θ2 at the same time, but such an effect cannot be obtained by using only one of the angles. Note that if the side rake angle and front rake angle are both less than 5 degrees, it tends to bite and has almost no effect compared to conventional products, and if it is more than 70 degrees, the blade tends to slip and polishing becomes difficult.

Therefore, the side rake angle θ1 and the front rake angle θ2
Both are in the range of 5 degrees to 7 degrees, and more preferably both are in the range of 20 degrees to 30 degrees.
degree. In addition, as a result of examining various iron-based cutters as materials to be polished using disc chips as in the present invention, cemented carbide was found to be the best material. By using cemented carbide as the disc tip material, it is possible to sharpen anything from stainless steel to hard knife steel, and it also has excellent wear resistance and spill resistance.
Furthermore, it was generally good in various respects, such as its rust-resistant properties. It goes without saying that the material of this disc chip is not limited to the above-mentioned cemented carbide, but other materials such as high speed steel and ceramics may also be used.

<Effects of the invention> As described above, the knife sharpener of the present invention can significantly reduce the unstable sharpening of the knife by providing two rake angles, and thereby prevent chattering marks on the blade and the occurrence of excessive force. The dangers that are likely to arise due to
It is possible to provide a knife sharpener that is safe and easy to use. Also, since it uses a disc chip,
The entire circumference of the tip acts as a sharpening blade and can be used for a long time.

[Brief explanation of drawings]

Figure 1 is a plan view of the conventional product, Figure 2 is the right side view of Figure 1, Figure 3 is a disk chip diagram, Figures 4 to 7 are structural diagrams of the conventional product, and Figure 8 is the main body. A plan view of an embodiment of the invention, FIG. 9 is a front view of FIG. 8, FIG. 10 is a right side view of FIG. 8, FIGS. 11, 12, and 14. A structural diagram of the invention, FIG. 13 is an explanatory diagram for comparative study.

Claims (1)

[Claims for Utility Model Registration] (1) A knife sharpener whose sharpening blades are the outer periphery of a disc chip having a circular hole, the disc chip having two receivers fitted at approximately right angles. On the inner surface determined by the axial center of the shaft, the above 2
At the same time, the receiving shafts of the disk chips are tilted in a direction in which they are enlarged by a predetermined angle θ1 with respect to the direction in which the book receiving shafts are engaged with the cutter, and at the same time, the plane determined by the axial centers of the two receiving shafts is The disc tip is attached to the sharpener at a predetermined angle θ1, θ with the receiving shaft of the disc tip tilted in a direction that descends by a predetermined angle θ2 with respect to the horizontal plane of the sharpener in the pulling direction of the cutlery.
A knife sharpener characterized in that 2 is 20 degrees to 30 degrees. 2. A knife sharpener according to claim 1, characterized in that the clearance between the inner diameter hole of the disc tip and the receiving shaft is 0.05 to 0.10 mm. 3. In claim 1 or 2 of the utility model registration claim, the clearance between the disc chip and the width of the disc chip set groove relative to the thickness of the washer that holds the disc chip from both sides is 0.1 to 0.1.
A knife sharpener characterized by a sharpness of 0.5mm.