JPS6341594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating electric shaver that converts rotational motion of a motor into reciprocating motion to drive inner cutters.

Conventionally, this type of electric shaver is provided as shown in FIGS. 1 to 7. First, a motor 3 is attached to a main body frame 2 provided within a main body case 1, and an eccentric cam 5 having an eccentric pin 4 is provided on the motor shaft of the motor 3. Further, engagement grooves 6 are provided in parallel on both sides of the main body frame 2. Such an engagement groove 6
A U-shaped vibrator 8 is provided with elastic legs 7 whose lower ends are engaged with each other.
In the center is a shaft 1 consisting of a large diameter part 9 and a small diameter part 10.
1 is formed protrudingly, and an engager 14 is provided on the small diameter portion 10 so as to be movable in the axial direction and is urged upward by a compression spring 12 and prevented from coming off by a stop pin 13. It is considered to be a tapered surface. Further, on the back surface of the vibrator 8, an engagement hole 15 is formed which is elongated in a direction orthogonal to the longitudinal direction of the vibrator 8 and into which the eccentric pin 4 is engaged.

Next, an inner cutter body 17 having a large number of inner cutters 16 arranged in parallel is provided, and a mounting base 1 for this inner cutter body 17 is provided.
8 is formed with a recess 19 into which the engager 14 is fitted while being fitted with the shaft 11.
There is a notch 20 around which the stop pin 13 is inserted.
are formed in directions perpendicular to each other in the normal mounting position.

Further, a removable outer cutter case 21 is provided on the main body case 1, and an outer cutter 22 that is joined to the inner cutter 16 is attached to this outer cutter case 21.

Therefore, in the main body case 1, there is an opening 23.
The vibrator 8 is attached with the shaft 11 protruding further. A felt 25 is attached to the large diameter portion 9 of the vibrator 8, which is located within the groove 24 and prevents the intrusion of hair shavings. Then, when the stop pin 13 is inserted into the notch 20 while the inner cutter body 17 is oriented orthogonally, and then returned 90 degrees, the inner cutter body 17 is held between the engagement member 14 fitted in the recess 19 and the stop pin 13. Next, the assembly is completed by attaching the outer cutter case 21.

When the motor 3 is driven in this state, the eccentric cam 5 rotates, and the eccentric pin 4 causes the vibrator 8 to rotate.
is driven to make reciprocating motion. As a result, the inner cutter body 17 reciprocates with respect to the outer cutter 22 to perform hair shearing. The motion states of each part at this time are shown in Figure 4 a and b.
As shown in FIGS. 7a and 7b. In FIGS. 5 and 7, the elastic legs 7 are tilted and the height of the vibrator 8 is lowered, but the presence of the compression spring 12 reduces the contact pressure between the inner cutter 16 and the outer cutter 22. There's nothing to do.

According to such a conventional structure, the distance between the motor 3 and the inner cutter body 17 is large, and motion transmission and twisting between them are likely to occur, resulting in large vibrations. Moreover, since the vibrator 8 and the inner cutter body 17 are movable objects that reciprocate, their mass is large, and from this point of view, the vibration becomes large. Moreover, as a result, power consumption is also large. Furthermore, since there are many connecting parts, the noise level is high.

In this type of electric shaver, it is necessary to maintain a constant contact pressure between the inner cutter 16 and the outer cutter 22, and this function is achieved by the biasing force of the compression spring 12. In order to make the pressing force uniform as described above, it is better that the spring constant of the compression spring 12 is lower, but its compression length is limited and is not necessarily sufficient.

The present invention has been developed in view of these points, and has low vibration and noise generation, low power consumption, and maintains a constant contact pressure between the inner cutter and the outer cutter without using a compression spring. The purpose is to obtain a reciprocating electric shaver that can

The present invention shortens the distance between the motor and the inner blade by integrating the connecting arm, which is connected to the eccentric cam and has a connecting hole, and the inner blade, thereby reducing the mass of the moving parts. At the same time, the number of connecting parts is reduced to one, which reduces vibration generation, suppresses noise generation, and consumes less power.In addition, the elastic leg that connects the main body case and the inner blade body has an elastic part. As a result, the inner cutter body can be biased toward the outer cutter using elastic legs without using a compression spring.This allows the spring constant to be set freely, making the pressure contact force uniform. In addition, the distance between the motor and the inner cutter body is reduced to suppress vibration generation, and the power consumption is also reduced.

A first embodiment of the present invention will be described based on FIGS. 8 to 14. First, a motor 28 is attached to a support wall 27 above the main body case 26, and a motor shaft 29 protrudes from an opening in the support wall 27. At the tip of the motor shaft 29, an eccentric cam 31 having an eccentric pin 30 is attached. It is fixed. Attachment grooves 32 are formed on both sides of the upper part of the support wall 27, and locking pins 34 urged outward by compression springs 33 are provided at both ends. An outer cutter case 36 that is engaged with such a locking pin 34 and is provided with an outer cutter 35 is provided in a detachable manner.

Next, a vibrator 37 is formed of elastic plastic. The vibrator 37 is formed into a U-shape by a base surface 38 and elastic legs 39 integrally formed on both sides of the base surface 38. At the lower ends of these elastic legs 39 are U-shaped mounting pieces 40 that fit into the mounting grooves 32.
are integrally formed, and an elastic part 41 that bends inward in a semicircular shape and applies elastic force in the longitudinal direction is provided in the middle part.
is formed. Further, the base surface 38 has a rectangular cutout window 42 in the center, and this cutout window 42
An elastic drive arm 44 having a connecting hole 43 at its tip that fits with the eccentric pin 30 is formed protruding inside. Furthermore, two holes 45 are formed at both ends of the cutout window 42.

Next, an inner cutter body 47 is formed in which a large number of inner cutters 46 are arranged in parallel, and a support shaft 48 that fits into the hole 45 is integrally formed on this inner cutter body 47. The inner cutter body 47 and the vibrator 37 are integrated with each other by welding their tips.

In such a configuration, the vibrator 37 is inserted while the eccentric pin 30 is inserted into the connection hole 43 of the drive arm 44.
When the mounting piece 40 is fitted into the mounting groove 32, the inner blade 47 is mounted to the main body case 26 via the vibrator 37, as shown in FIG. Then, the assembly is completed by fitting the outer cutter case 36. At this time,
The elastic portion 41 is bent by the pressure applied by the outer cutter 35, and the pressure applied between the inner cutter 46 and the outer cutter 35 is maintained at an appropriate level.

Therefore, removing the beard shavings after shearing is done by removing the outer blade case 36,
If necessary, the inner blade body 47 can also be disassembled by removing the mounting piece 40 from the mounting groove 32.

When the motor 28 is driven in the assembled state, the vibrator 37 and the inner cutter body 47 operate in the process shown in FIGS. 11 to 14 due to the rotation of the eccentric cam 31. That is, in the case shown in FIG. 11, when the inner blade body 47 is at the center position, the eccentric pin 30 is biased in the width direction, so that the drive arm 44
is bent to one side. The state shown in FIG. 12 is that the eccentric pin 30 has rotated 90 degrees clockwise from this state, and although the drive arm 44 has returned to the center, the base surface 38 of the vibrator 37 has moved to the right, so the state shown in FIG. The blade body 47 also slides to the right. At this time, since the elastic portion 41 stretches to some extent, the pressing force between the inner cutter 46 and the outer cutter 35 is maintained substantially constant. Next, when the eccentric pin 30 rotates 90 degrees, the state shown in FIG. 13 is reached, and the inner blade 47 returns to the center position while the drive arm 44 bends in the other direction. Further, when the eccentric pin 30 rotates 90 degrees, the state shown in FIG. 14 is reached, the drive arm 44 returns to the center, and the inner cutter body 47 moves to the left.

While repeating this process, the rotational motion of the motor 28 is converted into a reciprocating linear motion, and the inner cutter body 47 reciprocates. Then, from the motor 28 to the inner blade body 4
7 is the connection between the eccentric pin 30 and the connection hole 43 of the drive arm 44,
There is little play and no noise. In addition, since the base surface 38 on which the drive arm 44 is provided is located on the inner surface of the inner blade body 47, the distance between the motor 28 and the inner blade body 47 is short, so that the driving state is smooth and vibration does not occur. There are few factors. Furthermore, since the vibrator 37 itself is plate-shaped, its mass is light, further reducing vibration generation.

A second embodiment of the present invention is shown in FIGS. 15 to 21.
This will be explained based on the diagram. First, an opening 54 from which an eccentric pin 53 of an eccentric cam 52 connected to a motor 51 projects is formed in an upper support wall 50 of the main body case 49 . Further, locking pins 56 which are biased outward by compression springs 55 are provided at both ends of the support wall 50, and an outer cutter case equipped with an outer cutter 57 is engaged with these locking pins 56. 58 is detachably provided.

Next, an elastic leg 59 integrally formed of a steel plate or elastic plastic is fixed to the upper surface of the support wall 50 by a fixing screw 60.
This elastic leg 59 consists of a base surface 61 that joins to the main body case 49 and leg portions 62 rising from both sides of this base surface 61, and the tips of these leg portions 62 are formed into arc-shaped engagement edges 63. , an elastic portion 64 that bends inward in a semicircle is formed in the intermediate portion.

Thus, an inner cutter body 66 is provided in which a plurality of semicircular inner cutters 65 are attached in parallel, and two support shafts 67 that protrude downward are formed in the center of this inner cutter body 66. There is. A U-shaped drive arm 6 has a hole 68 into which these support shafts 67 are inserted.
9 is formed, and this drive arm 69 is connected to the support shaft 6.
7 is fixed to the inner cutter body 66 by welding, and a connecting hole 70 in which the eccentric cam 53 engages is formed at the other free end.

In such a configuration, the inner surface of the inner blade body 66 has an engagement groove 71 in which the engagement edge 63 of the elastic leg 62 engages.
is formed, so that the inner blade body 66 can be attached while passing the eccentric pin 53 through the connecting hole 70. At this time, the lower edge 72 of the inner blade body 66 comes into contact with the stepped portion 73 of the elastic leg 62, and is prevented from rotating in the inner circumferential direction.

In this way, the motor 51 in the assembled state
When driven, the eccentric pin 53 moves eccentrically due to the rotation of the eccentric cam 52. As a result, the inner cutter body 66 reciprocates via the drive arm 69. 18 to 21 show the respective relationships among the position of the eccentric pin 53, the bending state of the drive arm 69, and the inner blade body 66. At this time, the drive arm 69 does not extend or contract in the longitudinal direction, but has the property of bending in the lateral direction.

In particular, since the elastic leg 59 includes the elastic portion 64, the contact pressure between the inner cutter 65 and the outer cutter 57 is kept substantially constant.

As a result of the inner blade body 66 being driven in this way,
The distance between the motor 51 and the inner cutter body 66 is short, the mass of the inner cutter body 66 is small, and the power connection is in one place between the eccentric pin 53 and the drive arm 69, so there is little vibration. It generates less noise and consumes less power.

In the present invention, as described above, the connecting arm in which the connecting hole connected to the eccentric cam is formed and the inner blade body are integrally connected, so that the motor provided inside the main body case and the inner blade body are connected together. The distance can be shortened, the number of connection points can be reduced, and the mass of moving parts can be reduced, thereby reducing the generation of vibration and noise. Furthermore, the power consumption can be reduced.In addition, the inner blade body is supported via an elastic leg with respect to the main body case provided with the eccentric cam, and an elastic part is provided in the middle part of the elastic leg. Because of the bent shape, even if the support length of the inner cutter body that reciprocates with the eccentric cam changes, the pressure contact force between the inner cutter and the outer cutter can be kept almost constant due to the deformation of the elastic part.
Moreover, since the spring constant of the elastic part can be set freely, it is easy to maintain the necessary pressure contact force, and
The rate of change can be reduced, and the distance between the motor and the inner cutter can be reduced, and its mass can also be reduced.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an example of a conventional example, Fig. 2 is a perspective view showing the back of the inner blade, Fig. 3 is a partially cutaway perspective view showing the back of the vibrator, Fig. 4 a, b
Figures 7a to 7b are vertical and horizontal sectional views showing the operating process, Figure 8 is an exploded perspective view showing the first embodiment of the present invention, and Figure 9 is with the outer cutter case removed. FIG. 10 is a vertical side view of the assembled state; FIGS. 11a, b to 14a, b are vertical and horizontal sectional views showing the operating process; FIG. An exploded perspective view showing a second embodiment of the invention, FIG. 16 is a vertical side view when the outer cutter case is removed, FIG. 17 is a vertical side view of the assembled state, and FIGS. 18a, b to 21. a,
b is a longitudinal and horizontal cross-sectional view showing the operation process. 26... Main body case, 31... Eccentric cam, 35... Outer blade, 39... Elastic leg, 41... Elastic part, 46... Inner blade,
47... Inner blade body, 49... Main body case, 52... Eccentric cam, 57... Outer blade, 59... Elastic leg, 64... Elastic part,
65...Inner blade, 66...Inner blade body.

Claims (1)

[Claims] 1. A main body case to which a motor is attached, an eccentric cam connected to the motor and rotating at a position protruding from the main body case, and an outer cutter case provided with an outer blade and detachably attached to the main body case;
An inner cutter body in which a large number of inner cutters are arranged in parallel in contact with the outer cutter, and a connecting hole that is freely displaceable in a direction orthogonal to the sliding direction of the inner cutter body and that engages with the eccentric cam is formed at the tip. a drive arm whose base end is fixed to the inner blade body, and a pair of drive arms having one end engaged with the inner blade body, the other end attached to the main body case, and having an elastic part bent in a semicircular shape in the middle part. A reciprocating electric shaver characterized by plate-like elastic legs.