JPH0439355B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a blade structure, particularly an outer blade structure, in a rotary electric shaver in which an inner cutter rotates while slidingly contacting an outer cutter.

[Background technology]

Electric razors are equipped with elongated hair introduction holes on the outer blade to reliably cut long beards that have been growing for several days or fallen beards, as well as on the inner surface of the outer blade to prevent deformation of the outer blade crosspiece. Some have a comb attached.
One such device is disclosed in Japanese Utility Model Application Publication No. 56-151078.

However, it is not easy to adjust the pitch between the outer cutter and the comb to reduce the amount of deviation between the two, considering variations in component accuracy, accuracy of the joining method between the comb 2 and the outer cutter, and the like.

One of the reasons for this is, as shown in Fig. 9, the pattern center O of the outer cutter 1 and the shape center _O1 of the outer cutter 1. The purpose is to generate a deviation amount ΔB between the intersection point C and the center of the circle formed by the intersection C and Regarding this, it is necessary to explain the manufacturing method of the blade. Generally, in the case of a rotary blade, the outer blade shape of the outer blade 1 is as follows:
It is dome-shaped and consists of an outer blade upper surface A and an outer blade rising part B. When manufacturing the outer blade 1,
It is formed into a dome shape by punching out an outer cutter pattern on a flat metal plate and then drawing it.The pattern center O of the outer cutter pattern and outer cutter 1
The center of shape O ₁ may not match and may shift. In the case where the comb 2 is integrally molded and built into the upper part of the outer cutter frame 5, a dowel 4 for positioning the outer cutter 1 is provided on the upper surface of the comb 2, as shown in FIG. The blade 1 is placed on the outer blade frame 5, and in this state, heat is applied to the synthetic resin comb 2 through the outer blade 1 by heat welding or other means to fuse the comb 2 to the inner surface of the outer blade 1. It will be done. However, when the outer cutter 1 is placed on the outer cutter frame 5, the dowels 4 are fitted into the slits 6 and positioned, and the outer cutter pattern of the outer cutter 1 matches the position of the comb 2, resulting in the pattern of the outer cutter pattern. The center O and the center of the comb 2 match (even if the pattern center O of the outer cutter 1 and the shape center O ₁ of the outer cutter do not match, the outer cutter 1 is fitted by fitting the dowel 4 into the slit 6). While applying force that deforms the blade 1, the pattern center O
(and the centers of the comb 2 coincide with each other), but during thermal welding, the outer cutter 1 is guided in a direction such that the gap D between the side wall of the outer cutter 1 and the side wall of the comb 2 becomes uniform, as shown in FIG. In other words, if heat is applied along with pressure from above during heat welding, the inner surface of the side wall of the outer cutter 1 will align with the outer peripheral surface of the comb, and the center O of the outer cutter pattern and the shape center of the outer cutter shape.
If O ₁ is misaligned, the dowel 4 melted by the heat will be misaligned,
The pattern center O and the comb center are misaligned. In other words, the comb 2 and the outer cutter 1 are positioned not along the outer cutter pattern of the outer cutter 1 but along the outer cutter shape. To illustrate, in the outer cutter pattern of FIG. 8, it is the slit 6 that joins the comb 2, and if the points A, A, U, and E of the slit 6 correspond to the dowels 4 of the comb 2, then the slit 6
The positional relationship between the comb 2 and the comb 2 is as shown in FIG. In Figure 9, since the pattern center O and the shape center _O1 are misaligned, the dowel 4 is melted by heat welding, etc., and the slit 9 is
This causes a positional shift, and the shape center of outer cutter 1 O ₁
The pattern center O is shifted by ΔB in the negative direction of Y. That is, the comb 2 and dowel 4 also follow the shape of the outer blade due to thermal welding, so that the outer periphery of the comb 2 settles at position M in the figure when welding is completed. However, the outer periphery of the outer cutter pattern is at position N in the figure, and the outer cutter slit 6 is shifted by ΔB.

When the above-mentioned deviation ΔB occurs, the normal position shown by the solid line in FIG. 12 changes to the state shown by the imaginary line, and the whisker introduction hole 8 narrows from the normal _E1 to _E2 , and the degree of whisker introduction changes. In addition, the cutting edge 9 at the tip of the outer blade 1 is not covered, and the beard introduction hole 8 becomes narrow at E ₃ at the back, making it difficult to shave easily on the tip of the beard. There was a problem that the cutting strength decreased and the cutting edge 9 pulled the hair.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned technical background, and its purpose is to more reliably prevent the hair from being pulled at the hair introduction portion of the outer cutter where the inner cutter does not come into sliding contact with the inner cutter. In addition, by making the slit width of the hair introduction hole stable, the hair can be introduced smoothly.

[Disclosure of the invention]

The electric razor blade of the present invention has a dome-shaped outer blade 1
In an electric shaver blade, a synthetic resin comb 2 is arranged along the inner surface of the outer wall of the electric shaver, and an inner cutter 3 is provided inside the outer cutter 1 apart from the comb 2 and slidably contacts the inner surface of the outer cutter 1. Pattern center O of outer blade pattern 1
Position the outer cutter 1 and the comb 2 at three or more points so that the center of the comb 2 coincides with the center of the comb 2, and This is characterized in that the contact area between the upper surface of the outer cutter 2 and the upper inner surface of the outer cutter 1 is formed to be larger, thereby achieving the above object.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The hair introduction hole 8 is formed in the outer circumferential wall portion of the outer cutter 1, and the inner cutter 3 does not come into sliding contact with this portion, and the comb 2 is brought into contact with the inner surface side. The outer cutter 1 and the comb 2 are positioned in at least three locations using the dowels 4 shown in Figure 5, and the positions in the X direction and Y direction (direction perpendicular to the rotation axis of the inner cutter 3; shown in Figure 9) are combined. Next, as shown in FIGS. 2 and 3, the width F ₂ of the side wall of the comb 2 is made smaller than the width F ₁ of the top surface of the comb 2 (F ₂ <F ₁ ), thereby making the width of the comb 2 smaller. The contact area between the upper surface of the comb 2 and the upper inner surface of the outer cutter 1 is made larger than the contact area per unit area between the side wall and the side wall of the outer cutter 1. This facilitates melting and press-fitting deformation of the comb 2 on the side wall surface of the comb 2, and even if there is eccentricity between the pattern center O and the shape center _O1 of the outer cutter 1, the comb 2 is deformed in a direction that reduces the eccentricity. It makes it easier. In other words, when the outer cutter 1 is placed on the outer cutter frame 5, the slit 6 of the dowel 4
When fitted, the pattern center O of the outer cutter pattern and the center of the comb 2 are aligned, and when pressure and heat are applied from above in this state, the upper surface of the comb 2 and the upper inner surface of the outer cutter 1 Due to the large contact area and the positioning of the dowel 4, the position of the upper surface of the comb 2 and the upper inner surface of the outer blade does not shift, and the comb 2 has a small contact area.
The side wall of the comb 2 melts or deforms between the side wall and the side wall of the outer cutter 1, and the center of the comb 2 and the pattern center O of the outer cutter pattern do not shift the dowel 4.
There is no misalignment. Therefore, even if the pattern center O of the outer cutter 1 and the comb 2 are initially eccentric, the pattern center of the outer cutter 1 and the comb 2 can be easily aligned.

The one shown in FIG. 6 is another example of the present invention, in which positioning at three or more points using dowels 4 is the same as in the above example, but between the side wall of the comb 2 and the inner surface of the side wall of the outer cutter 1. A gap G is formed to make the contact area between the upper surface of the comb 2 and the upper surface of the outer cutter 1 larger than the contact area per unit area between the side wall of the comb 2 and the side wall of the outer cutter 1. Because of the gap G, there is no effect of eccentricity.

What is shown in FIG. 7 is still another example of the present invention,
A gap G is partially provided between the side wall of the comb 2 and the inner surface of the side wall portion of the outer cutter 1, so that the influence of eccentricity can be corrected.

〔Effect of the invention〕

Since the present invention is configured as described above, the outer cutter and the comb are positioned at three or more points, positioning is performed in a plane, and the contact per unit area between the side wall of the comb and the side wall of the outer cutter is achieved. The contact area between the top surface of the comb and the top inner surface of the outer blade is made larger than the surface area, so when the outer blade is heat welded to the comb, the top surface of the comb and the top inner surface of the outer blade are in close contact with each other. Even if the center of the outer cutter pattern and the center of the shape of the outer cutter are misaligned, the outer peripheral surface of the side wall of the comb will melt or deform, and the center of the outer cutter pattern will match the center of the comb. The outer blade and comb are integrated in this way, reducing the misalignment between the comb and the hair introduction hole of the outer blade, smoothing the introduction of the hair, and reducing the chance of the hair getting caught on the edge of the cutting blade. It has the advantage of being able to

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a PP sectional view of Figure 1, and Figure 3 is the Q of Figure 1.
-Q sectional view, FIG. 4 is a partially cutaway front view showing the entire blade, FIG. 5 is a perspective view of the comb and outer blade before heat welding, and FIG. 6 is another example of the present invention. 7 is a sectional view showing still another example of the present invention, FIG. 8 is a plan view showing the pattern of the outer cutter, FIG. 9 is an explanatory view for explaining the problems of the conventional example, and FIG. The figure is a sectional view before heat welding showing the conventional outer blade positioning method, Figure 11 is a sectional view after heat welding of the same as above, and Figure 1
FIG. 2 is an explanatory diagram showing the drawbacks of the conventional example, in which 1 is an outer cutter, 2 is a comb, and 3 is an inner cutter.

Claims (1)

[Scope of Claims] 1. A synthetic resin comb is arranged along the inner surface of the outer wall of a dome-shaped outer cutter, and an inner cutter is provided inside the outer cutter away from the comb and slidably contacts the inner surface of the outer cutter. In the razor blade, the outer blade and comb are positioned at three or more points so that the pattern center of the outer blade pattern of the outer blade matches the center of the comb, and the unit between the side wall of the comb and the side wall of the outer blade is An electric razor blade characterized in that the contact area between the upper surface of the comb and the upper inner surface of the outer blade is formed to be larger than the contact area per area. 2. The electric shaver blade according to claim 1, characterized in that a gap is provided between the side wall of the comb and the side wall of the outer cutter.