JPH0120911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric shaver. Conventionally, as shown in FIG. 1, there is an electric shaver in which an inner cutter 2 is provided inside an outer cutter 1 curved in a semicylindrical shape so as to be able to move back and forth in a straight line.
Because it is perpendicular to the inner surface of the blade, there is no rake angle, resulting in a dull cutting edge and a heavy load.

For this reason, as shown in FIG.
The development of a rotary type electric shaver is underway, in which an inner cutter body 5 is rotatably provided with an inner cutter body 5 connected to an inner cutter body 5 having a shape. In this case, in order to bring the inner cutter 4 and the outer cutter 1 into close contact, one end 6 of the outer cutter 1 is fixed and the other end 7
is supported with approximately play in the direction of curvature of the outer cutter 1 (direction of arrow A). That is, the outer cutter 1 is deflected by the contact pressure of the inner cutter 4, but when the inner cutter 4 contacts the rear side in the rotational direction (one end 6 side of the outer cutter 1), the outer cutter 1 is pulled in the direction of arrow B; Outer blade 1
Since one end 6 of the blade is fixed, the braking action applied to the inner blade body 5 at this time is large and durability is poor. Further, the outer cutter 1 is inhibited from freely moving in response to the contact pressure of the inner cutter 4, and its close contact with the inner cutter 4 is poor, resulting in poor sharpness.

The present invention has been made in view of these points, and an object of the present invention is to provide an electric shaver that can improve sharpness, smoothly rotate the inner cutter body, and increase durability.

In this invention, one end of the outer cutter is fixed and the other end is supported with approximately play in the curved direction, so that when the outer cutter is operated by the contact pressure of the inner cutter, a braking action occurs on the fixed side. By deviating the inner cutter toward the forward rotational direction in which the outer cutter is more likely to move due to the contact pressure of the inner cutter, the braking force generated on the side where one end of the outer cutter is fixed is reduced, and as a result, the outer cutter The overall flexibility is restored and the outer cutter and inner cutter are brought into uniform contact, thereby increasing sharpness and durability.In addition, the inner cutter changes its contact position with the outer cutter every moment. , there is also a process that does not interfere with the outer cutter, and as a result, the outer cutter causes uneven movement on the surface. However, by forming ribs on the outer cutter along the curved direction, the uneven movement of the outer cutter is kept to the necessary minimum and the inner cutter is The resistance acting between the blade and the outer blade is further reduced,
The other end of the outer cutter is supported with some play between the center of the curved part of the outer cutter and the part facing the rotating direction of the inner cutter, so it moves freely. By gradually increasing the thickness from one end toward the fixed end, it not only reinforces the mounting base of the outer cutter, but also prevents excessive local curving movement of the outer cutter, allowing it to curve smoothly and reducing the difference in deformation between parts. This structure is designed to further reduce friction.

An embodiment of the present invention will be explained based on FIGS. 3 and 4. First, a main body case 11 is provided which houses a motor 8 and has a bearing 10 that rotatably supports an inner cutter body 9. The inner blade body 9
In this example, a plurality of inner cutters 13 extending tangentially to the outer periphery of an inner cutter stand 12 supported by the bearing 10 are attached by screws 14. These inner cutters 13 are urged in the outer circumferential direction by their own elasticity, but the amount of movement in the outer circumferential direction is limited by a stopper 15 formed by a screw screwed into the inner cutter base 12. Further, holes 16 are formed in these inner cutters 13 to reduce air resistance. The motor 8 and the inner blade 9 are connected to pulleys 17 and 18 and a belt 1.
They are connected by 9.

Next, an outer cutter case 21 is resiliently held by locking claws 20 formed on both sides of the main body case 11.
is provided. The outer cutter case 21 has ribs 22 to maintain the outer cutter 2 in a curved shape.
One end 24 of the outer cutter 23 is fixed, and the other end 25 of the outer cutter 23 is supported with play along the curved direction (direction of arrow A in FIG. 4). As shown in FIG. 7, the thickness of the outer cutter 23 is set at the thinnest t on the other end 25 side, and gradually increases toward the fixed end 24, and is set at a maximum of 1.5 to 2 t.
The rotation center axis C ₁ of the inner cutter body 9 is deviated from the curved center axis C ₂ of the outer cutter 23 by about 0.3 to 0.8 mm toward the forward direction of rotation and upward, respectively.

In such a configuration, a switch (not shown) is turned on to rotate the motor 8 and rotate the inner cutter body 9 to perform shaving. During rotation, the inner cutter 13 is in contact with the outer cutter 23 and in a state where it is separated from the outer cutter 23. During the contact process, the inner cutter 23 is biased in the outer circumferential direction by its own elasticity, so it comes into close contact with the outer cutter 23 at an angle of θ. This provides good sharpness. When the inner cutter 13 separates from the outer cutter 23, it deviates toward the outer circumference and rotates on a trajectory D as shown in FIG. Even when it comes into contact with the outer cutter 23 again, the rake angle is maintained and the friction is small. When the inner cutter 13 moves on the trajectory D, the inner cutter 13 is supported by the stopper 15, but when the inner cutter 13 is pushed by the outer cutter 23 and moves away from the stopper 15, the inner cutter 13 centers on the screw 14. Since the length that can be bent becomes longer, the spring constant becomes smaller. Therefore, even if the distance from the rotation center C ₁ of the inner cutter body 9 to the outer cutter 23 changes, the change in the contact pressure against the outer cutter 23 is extremely small. In particular, one end 24 of the outer blade 23
is fixed and is pulled in the direction of arrow B when it comes into contact with the inner cutter 13, applying a brake to the inner cutter 13, but on the rotating direction advancing side where the inner cutter body 13 easily moves along the direction of arrow A of the outer cutter 23. The braking force applied by the outer cutter 23 to the inner cutter 13 is reduced, and flexibility is restored to the entire outer cutter 23.
It is possible to uniformly bring the inner cutter 13 into close contact with the inner cutter 13. Therefore, sharpness and durability are improved.

In addition, there is a process in which the inner cutter 13 changes its contact position with the outer cutter 13 every moment and does not interfere with the outer cutter 23, and as a result, the outer cutter 23 causes uneven movement on the surface.
By forming the ribs 22 along the curved direction on the outer cutter 23, it is possible to minimize the uneven movement of the outer cutter 23 to the necessary minimum and further reduce the resistance acting between the inner cutter 13 and the outer cutter 23. be.

Furthermore, since the other end 25 of the outer cutter 23 is supported with some play in the direction of the arrow A, it can move freely from the center of the curved part of the outer cutter 23 to the other end 25, but the thickness of the outer cutter 23 The outer cutter 23 is thinner at the other end 25 and gradually thickens toward the fixed end.
In addition to reinforcing the mounting base of the outer cutter 23 to the outer cutter case 21, the outer cutter 23 and the inner cutter 13 are prevented from local excessive movement and curved smoothly to reduce the difference in the amount of deformation between the parts. It is possible to further reduce the frictional force.

As described above, this invention is capable of reducing the braking force exerted by the outer cutter on the inner cutter by deviating the inner cutter body toward the forward rotational direction with respect to the central axis of curvature of the outer cutter. As a result, flexibility can be restored to the entire outer blade and the outer and inner blades can be brought into even contact with each other, thereby increasing sharpness and durability. By forming ribs along the outer cutter, the uneven movement of the outer cutter due to interference with the inner cutter can be kept to the necessary minimum, and the resistance acting between the inner cutter and the outer cutter can be further reduced. By setting the thickness of the blade to be thinner on the freely movable side and gradually thicker towards one end of the fixed side, the attachment base of the outer cutter to the outer cutter case is reinforced, and the curved deformation of the outer cutter is performed smoothly to reduce friction. This has the effect that it is possible to further reduce the .

[Brief explanation of drawings]

Fig. 1 is a partial vertical sectional side view of a conventional example in which an inner cutter that moves linearly reciprocated faces an outer cutter, and Fig. 2 shows a part of a conventional example in which an inner cutter that moves in a rotational motion faces an outer cutter. 3 is a longitudinal sectional side view showing an embodiment of the present invention, FIG. 4 is a vertical sectional front view of the main parts, FIG. 5 is a perspective view of the outer cutter, and FIG. 6 is the inner part. FIG. 7 is a perspective view showing the blade mounting structure, and FIG. 7 is a sectional view showing the outer blade in an enlarged manner. 9...Inner blade body, 12...Inner blade stand, 13...Inner blade, 21
...outer blade case, 22...rib, 23...outer blade.

Claims (1)

[Scope of Claims] 1. One end of the outer cutter curved into a semicylindrical shape is fixed to the outer cutter case, and the other end is supported by the outer cutter case with approximately play along the curved surface, and the outer cutter is An inner cutter body that rotates with an axis parallel to the center axis of curvature is provided, and the center axis of rotation of the inner cutter body is offset toward the advancing side in the rotational direction with respect to the center axis of curvature of the outer cutter. An electric razor. 2. One end of the outer cutter curved in a semicylindrical shape is fixed to the outer cutter case, and the other end is supported on the outer cutter case with approximately play along the curved surface, and is parallel to the central axis of curvature of the outer cutter. An inner cutter body that rotates about its axis is provided, and the rotational center axis of the inner cutter body is deviated toward the advancing side in the rotational direction with respect to the curved central axis of the outer cutter, and the thickness of the outer cutter is adjusted to the inner cutter thickness. An electric shaver characterized in that the blade body is thin on the advancing side in the rotational direction and gradually thickens toward the rear side in the rotational direction. 3. One end of the outer cutter curved into a semicylindrical shape is fixed to the outer cutter case, and the other end is supported on the outer cutter case with approximately play along the curved surface, and parallel to the central axis of curvature of the outer cutter. An inner cutter body that rotates about its axis is provided, the rotational center axis of the inner cutter body is deviated toward the rotating direction advancing side with respect to the curved center axis of the outer cutter, and a rib is provided on the outer cutter along the curved direction. An electric razor characterized by forming.