JPH1157244A - Blade having sliding surface and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a high cutting capability even for dense hair bundles and to prevent cutting errors even with very sparse hair bundles. SOLUTION: This movable blade 1 comprises blades 11 arranged in the shape of the teeth of a comb with tooth grooves 10 between them, with one side of each blade 11 serving as a surface sliding against another blade. In this case, the tooth groove angle α2 at the opening of the tooth groove 10 is smaller than the tooth groove angle α1 at the depth of the tooth groove 10. The tooth groove angles α1, α2 are both greater than 0 deg. and smaller than 180 deg.. The tip angle β2 at the opening of the tooth groove 10 is greater than the tip angle β1 at the depth of the tooth groove 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade, such as a clipper blade or a trimmer blade, in which one surface of a blade arranged in a comb-like shape via a blade groove is a sliding surface with another blade, and a method of manufacturing the same. Things.

[0002]

2. Description of the Related Art A movable blade in a hair clipper blade or a trimmer blade is formed by cutting a blade with a rotary grindstone to form a blade. Generally, a blade groove angle and a blade angle are formed to be constant.

[0003]

By the way, when the angle of the blade groove is increased, the cutting resistance is reduced, and when a dense hair bundle is cut, the hair is sufficiently introduced into the depth of the blade groove, so that the sharpness is improved. However, at the cost of cutting sparse hair bundles, the hairs escape from the blade grooves, and cutting defects tend to occur, such as more uncut hair and large variations in length after cutting.

[0004] In addition, as the cutting edge angle is reduced, the cutting resistance is reduced and the sharpness is improved accordingly. However, when the blade width is constant, the cutting edge angle is reduced, the blade thickness becomes thinner.
A strength problem arises. Of course, by increasing the blade pitch or reducing the blade groove depth, the problem of strength can be avoided, but in this case, the efficiency of introducing and cutting hair decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a high cutting ability for a dense hair bundle and to cause a cutting failure even for a very sparse hair bundle. An object of the present invention is to provide a blade having a sliding surface and a method for manufacturing the same.

[0006]

According to the blade having a sliding surface according to the present invention, the blades are arranged in a comb-like shape through a blade groove, and one surface of each blade slides with another blade. The second blade groove angle on the opening side of the blade groove is smaller than the first blade groove angle on the back side of the blade groove, and the first blade groove angle and the Both blade groove angles are 0
The first feature is that it is larger than 180 ° and smaller than 180 °. Dense bristle bundles can be cut with a low cutting resistance at the back of the blade groove, and sparse bristle bundles can cut each bristle in the bristle bundle at the opening side of the blade groove.

In the blade having a sliding surface according to the present invention, the second blade angle on the opening side of the blade groove is larger than the first blade angle on the inner side of the blade groove. It has a feature, and it is easy to maintain the strength by increasing the angle of the blade tip of the blade tip portion where the wear due to cutting is large.
The third feature of the blade having a sliding surface according to the present invention has both the features of the first feature and the features of the second feature.

[0008] The second blade groove angle is preferably 0 ° to 18 °. In cutting a sparse hair bundle, the effect of improving poor cutting can be increased. The edge length of the second edge angle or the second edge angle is 0.5 mm
The following is preferred. If the length is longer than this, the cutting ability by the first blade groove angle or the second blade angle decreases.

[0009] It is desirable that the first cutting edge angle is 60 ° or less. And the manufacturing method of the blade having a sliding surface according to the present invention is to grind the blade groove portion at an angle obliquely intersecting the sliding surface of the blade with a whetstone whose tip portion angle changes in two steps. Has features. A blade having first and second blade groove angles and first and second blade angles can be easily obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described. As shown in FIGS. 1 to 3, a fixed blade 2 and a movable blade 1, both of which are formed in a comb shape, are shown in FIGS.
The edge on the blade groove 10 side of each blade 11 arranged in the movable blade 1 via the blade groove 10 has a blade groove angle α on the back side of the blade groove 10.
1. On the opening side of the blade groove 10, the blade groove angle α2 and the blade edge angle β2 are formed, whereas the blade edge angle β1.

When such a blade 11 performs cutting and grinding using the grindstone 3, as shown in FIG. 4, the grindstone 3 is slid with the grindstone 3 having a two-step angle. It can be obtained by moving at an angle crossing the moving surface obliquely. That is, in a portion where the angle on the tip end side of the grindstone 3 is large, a region b in which the cutting edge angle β1 and the blade groove angle α1 are formed, and in a portion where the angle is small, the cutting edge angle β
2 and an area b which is the blade groove α2. The boundary between the region A and the region B has a curve with a radius of about 0.1 mm, and the blade length L of the region B is 0.5 mm or less.

In addition, in the above-mentioned grinding by the grinding wheel 3, by making the trajectory T of the grinding wheel 3 into an arc shape as shown in FIG. 5, the thickness of the blade at the deep end of the blade groove 10 can be increased. , It is easy to secure the strength. Silver paper No. 6 (13 wt% Cr, 0.3 w
A 1.4 mm thick base material composed of t% Mo and the balance Fe) was formed into the shape of a blade base of a movable blade by press punching or bending, and then subjected to 1 quenching and tempering heat treatment to form a borazon whetstone (# 600). After performing the blade cutting using the same, four types of GC polishing paper (# 180, # 500, #
1200, # 2400) in order from the coarser one, and the polishing surface was polished, and the fixed blade was processed in the same manner as the movable blade using a 2.8 mm thick base material. ~
The blade of each specification indicated by No. 6 was obtained. The number of blades is 2 for movable blades.
Zero blades and 30 fixed blades were used.

These were evaluated based on the following two criteria. One was to measure the cutting ability as a surrogate property of the ability to cut a large amount of tresses faster. In other words, while the movable blade and the fixed blade are aligned on the sliding surface and moved at an amplitude of 2.5 mm and a rotation speed of 600 rpm, 1000 pseudo hairs (0.1 mm φ modacrylic) were cut by changing the moving speed. In this case, the number of cuts per unit time was determined, and the largest one was determined as the cutting capacity (10,000 cuts / s). In this case, it corresponds to a cutting method in which a large amount of the hair bundle is forcibly pushed into the blade groove to cut, and the cutting ability is considered to be higher as the cutting ability is higher.

[0014] The other defined a sword-cutting test as a surrogate characteristic of the cutting ability when cutting small and sparse hair bundles. This is fake hair (0.1mmφ modacrylic) 20
The uncut height (mm) is measured when the cut is made at a moving speed of 30 mm / s by imitating the hem cutting from right below to right above in a state where 00 pieces are very sparse, and the smaller the remaining cut height, the smaller the cutting Deemed competent.

The results are shown in Table 1 together with Comparative Examples. In addition,
The difference between Example 2 and Example 6 is that the latter has a curve with a radius of 0.1 mm at the boundary between the blade groove angle α1 and the blade groove angle α2. When the blade groove angle is two steps and the blade tip angle is two steps, good results are shown in both the cutting ability and the uncut height. Further, it is understood that the cutting edge angle β1 is preferably smaller than 60 ° in terms of the cutting ability.

[0016]

[Table 1]

[0017]

As described above, according to the present invention, in the case where the blades are arranged in a comb-like shape via the blade grooves and one surface of each blade is a sliding surface with another blade, The second blade groove angle on the opening side of the blade groove is smaller than the first blade groove angle on the inner side of the groove, and both the first blade groove angle and the second blade groove angle are 0 °. Since it is larger and smaller than 180 °, a good cutting ability can be obtained for both dense and sparse hair bundles.

Further, even in the case where the second bevel angle on the opening side of the blade groove is larger than the first bevel angle on the back side of the blade groove, a good cutting ability can be obtained.
The strength can be easily maintained by increasing the included angle of the blade tip at the tip of the blade where the abrasion due to cutting is large. Further, with the above-mentioned second feature, more excellent cutting ability can be obtained.

Preferably, the second blade groove angle is 0 ° to 18 °. In cutting a sparse hair bundle, the effect of improving poor cutting can be increased. The edge length of the second edge angle or the second edge angle is 0.5 mm
If it is less than the above, there is no possibility that the cutting ability is degraded due to the first blade groove angle or the second blade angle.

By setting the first edge angle to 60 ° or less, the cutting ability can be further enhanced. And the manufacturing method of the blade having a sliding surface according to the present invention is to grind the blade groove portion at an angle obliquely intersecting the sliding surface of the blade with a whetstone whose tip angle changes in two steps. The blade having the first and second blade groove angles and the first and second blade angles can be easily obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of an embodiment of the present invention.

2A is a cross-sectional view of a portion of a blade groove angle α1 and a blade angle β1, and FIG. 2B is a cross-sectional view of a portion of a blade groove angle α2 and a blade angle β2.

FIG. 3 is a bottom view of the same.

FIG. 4 (a) is a plan view of the above, and FIG. 4 (b) is an explanatory view of cutting by a grindstone.

FIG. 5 is an explanatory view of another example of the cutting and grinding processing using a grindstone.

[Explanation of symbols]

 Reference Signs List 1 movable blade 10 blade groove 11 blade angle α1 first blade groove angle α2 second blade groove angle β1 first blade angle β2 second blade angle

Claims (7)

[Claims] 1. A blade in which teeth are arranged in a comb-tooth shape via a blade groove and one surface of each blade is a sliding surface with another blade. The second blade groove angle on the opening side of the blade groove is smaller than the groove angle, and both the first blade groove angle and the second blade groove angle are larger than 0 ° and smaller than 180 °. A blade with a characteristic sliding surface. 2. A blade having a plurality of blades arranged in a comb shape via blade grooves and one surface of each blade serving as a sliding surface with another blade. A blade having a sliding surface characterized in that the second bevel angle on the opening side of the blade groove is larger than the angle. 3. The first blade on the back side of the blade groove, wherein the blades are arranged in a comb-tooth shape via the blade groove and one surface of each blade is a sliding surface with another blade. The second blade groove angle on the opening side of the blade groove is smaller than the groove angle, and the first blade angle on the back side of the blade groove is smaller than the second blade angle on the opening side of the blade groove. A blade having a sliding surface, wherein both the first blade groove angle and the second blade groove angle are larger than 0 ° and smaller than 180 °. 4. The blade with a sliding surface according to claim 1, wherein the second blade groove angle is 0 ° to 18 °. 5. The slide according to claim 1, wherein the length of the second edge angle or the second edge angle is 0.5 mm or less. Blade with surface. 6. A blade having a sliding surface according to claim 2, wherein the first blade angle is 60 ° or less. 7. A blade having a sliding surface, characterized in that a blade groove portion is ground at an angle obliquely intersecting the sliding surface of the blade with a grindstone whose tip angle changes in two steps. Law.