JPH061106Y2 - Electric razor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a motor-driven electric shaver and takes measures against noise.

[Conventional technology]

One of the noises generated from an electric razor is a rattling noise generated between a rotating shaft of a motor and a bearing. Therefore, the rattling noise is reduced by setting the clearance between the rotary shaft and the bearing as small as possible.

[Problems to be solved by the device]

However, if the clearance between the rotary shaft and the bearing of the motor is set too small, it becomes very difficult to control the accuracy of the motor parts, and the workability of assembling the motor is not easy. Therefore, as a practical matter, there is a limit to reducing the clearance between the rotary shaft and the bearing, and the rattling noise generated in the clearance is inevitable.

The present invention solves these problems, keeps the motor structure as it is, and prevents the rattling noise from occurring on the body case side of the electric razor by taking measures to prevent rattling between the rotary shaft and the bearing of the motor. The purpose is to reduce the noise of the electric razor.

[Means for Solving the Problems]

In order to achieve the above object, in the electric shaver of the present invention, as shown in FIG. 1, for example, the pressure contact piece 23 is housed in the main body case 1. The press-contact piece 23 is the motor 3
The rotary shaft 16 includes a fixed frame portion 23a loosely fitted to the rotary shaft 16 so as to surround the outer periphery thereof, and an elastic body 23b integrally projecting inward from the fixed frame portion 23a. A holding means for retaining and holding the pressure contact piece 23 is inserted therethrough, and the pressure contact piece 23 is temporarily assembled to the motor 3. The press-contact piece 23 has a fixing frame portion so that the elastic body 23b always press-contacts with a part of the peripheral surface of the rotary shaft 16 only in one direction in a state where the motor 3 is positioned and fixed at a predetermined position in the main body case 1. 23a is fixed in the main body case 1.

[Action]

Since the press-contact piece 23 is temporarily assembled to the motor 3 so as not to come off, the press-contact piece 23 presses the elastic body 23b to a part of the peripheral surface of the rotary shaft 16 by positioning and fixing the motor 3 in the main body 1. It will be easier to assemble as if

When the elastic body 23 is constantly in pressure contact with a part of the peripheral surface of the rotary shaft 16 of the motor 3 from one direction, the rotary shaft 16 is constantly pressed in the eccentric direction in the bearing 30 of the motor 3 due to the pressure contact action. It will rotate without a hit.

〔Example〕

An embodiment of an electric shaver according to the present invention will be described with reference to FIGS.

The body case 1 of this is a front and rear case 1a made of plastic.
-The 1b is butted and integrally connected with the screw 2 or the like. Inside the main body case 1, a motor 3 and a battery 4 serving as its power source are arranged and arranged side by side. A reciprocating inner blade 5 is mounted on the upper part of the main body case 1, and a mesh-shaped outer blade 6 covering the inner blade 5 is detachably mounted with an outer blade holder 7.

A vibrator 8 for converting the rotation of the motor 3 into the left and right reciprocating motion of the inner blade 5 is arranged above the motor 3 and the battery 4 in the main body case 1. The vibrator 8 is a plastic molded product as a whole, and has a flat plate-shaped vibrator body 10, a drive shaft 11 projecting from the center of the upper surface of the vibrator body 10, and an upwardly integrated body from the left and right ends of the vibrator body 10. And thin-walled portions 12, 12 formed on the left and right,
Ends 12a of the 12 are fixed to the left and right of the inner surface of the upper wall 13 of the body case 1, and the drive shaft 11 projects upward from the central opening of the upper wall 13. The inner blade 5 is supported by an inner blade holder 14 on the upper end of the drive shaft 11 of the vibrator 8.

An eccentric cam 17 is fixed to a rotary shaft 16 projecting upward from a bearing portion 15 projecting from the upper end surface 3a of the motor 3, and an eccentric pin 18 projecting from the upper end surface of the eccentric cam 17 has an eccentric pin 18. A pin groove 19 provided in the front-rear direction on the lower surface of one of the left and right sides of 10 is slidably engaged in the front-rear direction.

Therefore, the motor 3 rotates, and this rotation is transmitted to the vibrator 8 through the eccentric cam 17 and the eccentric pin 18, and the vibrator 8 reciprocally vibrates in the left-right direction through elastic deformation of the thin portions 12 and 12. The inner blade 5 is reciprocated in the same direction.

Before the motor 3 is housed at the above-mentioned predetermined position in the main body case 1, a plastic pressure contact piece 23 is temporarily assembled in advance as shown in FIG. The press-contact piece 23 has a circular fixed frame portion 23a and a cantilever-shaped elastic body 23b integrally provided so as to project inward from a part of the inner circumference of the fixed frame portion 23a. The press-contact piece 23 uses the fixed frame portion 23a as the rotary shaft 1 of the motor 3.
6 is loosely fitted, and the eccentric cam 17 is inserted into and fixed to the rotating shaft 16 after the loose fitting, so that the pressure contact piece 23 is retained on the rotating shaft 16 by the eccentric cam 17 in a retaining state.

As shown in FIG. 1, the motor 3 is installed inside the main body case 1.
Motor mounts 20 and 21 for mounting the rotary shaft 16 so that the rotary shaft 16 is in an upward posture are provided in a vertically opposed manner. The motor mounts 20 and 21 are respectively formed in front and rear halves, and have front motor mounts 20a and 21a having semicircular cutouts 24a and 25a protruding from the inner surface of the front case 1a as shown in FIG. , Rear rear motor mounts 20b and 21b having semicircular cutouts 24b and 25b protruding from the inner surface of the rear case 1b.

Then, the motor 3 is first positioned and fixed between the upper and lower rear motor mounts 20b and 21b in the rear case 1b. In this case, the bearing portion 15 protruding from the upper end surface 3a of the motor 3 and the lower portion thereof. The bearing portion 26 protruding from the end face 3b is used as a semicircular cutout portion 24 of the rear motor mounts 20b and 21b.
b and 25b, respectively, and the upper end surface 3a of the motor 3
And the rear motor mounting base 20b is fixed by tightening the screw 27 with a fixing frame portion 23 of the press-contact piece 23.
a is fitted on a bearing portion 15 in the semicircular cutout portion 24b by fitting a detent protrusion 28 projecting from a part of the peripheral surface into a recess 29 provided in a part of the inner circumference of the semicircular cutout portion 24b. Is fitted and fixed to. As the press-contact piece 23 is fixed, the elastic body 2
As shown in FIG. 2, it is possible to obtain a state in which 3b is constantly pressed against one part of the peripheral surface of the rotary shaft 16 only from one direction. Then
The front case 1a is butted against the rear case 1b, and the front motor mounts 20a and 21a are connected to the rear motor mounts 20b and 21.
The front and rear cases 1a and 1b are integrally joined with a screw 2 by abutting against b.

As described above, since the rotating shaft 16 is constantly pressed against its peripheral surface by the elastic body 23b only from one body, the rotating shaft 16 and the bearing 30 fixed in the bearing portion 15 have a considerable clearance. Also in this case, the rotating shaft 16 is pressed by a part of the inner peripheral surface of the bearing 30 and therefore rotates without rattling.
Therefore, it is possible to prevent the rattling noise of the rotating shaft 16.

[Another embodiment]

FIG. 4 shows another embodiment of the present invention. In this embodiment, a flange 32 having a hole 31 is projected from the outer peripheral surface of the fixed frame portion 23a of the press contact piece 23, and the flange 32 is formed.
Is the lower surface of the rear motor mount 20b and the upper end surface 3 of the motor 3.
A screw 27 is screwed into the rear motor mount 20b from above and is passed through the hole 31 and is fastened together with the motor 3 by sandwiching it between the motor 3 and a. Other configurations are the same as those in the above embodiment.

The fixed frame portion 23a of the press-contact piece 23 is not circular,
For example, a square shape may be used, and the fixed position thereof is not limited to the motor mounting base 20, and it is essential only that the fixed position be easily fixed at the position surrounding the rotary shaft 16 in the main body case 1. Further, the piece 23 forms a fixed frame portion 23a by bending a leaf spring material substantially in an annular shape, and one end portion of the leaf spring material is bent and continuously extended inward of the fixed frame portion 23a. The bent continuous end may be the elastic body 23b.

Of course, the electric shaver is not limited to the inner blade reciprocating type, but can be similarly applied to the inner blade rotating type as shown in FIGS. 5 and 6. That is, even in this case, as shown in FIG. 6, the press-contact piece 23 is temporarily assembled to the rotation shaft 16 of the motor 3 in a retaining state. In this case, as a holding means for preventing the press-contact piece 23 from slipping off, a rotary piece 33 is used which is loosely fitted to the rotary shaft 16 and then inserted and fixed to the upper end of the shaft 16.
The inner blade holder 34 is fitted in the rotation piece 33 in a non-rotating manner.

Then, the motor 3 formed by temporarily assembling the press-contact piece 23 is
As shown in FIG. 5, at the predetermined position in the main body case 1, the first
By being fixed in the same manner as in the embodiment shown in FIGS. 1 to 3, the pressure contact piece 23 is fixed to the motor mount 20 so that the elastic body 23b is always in pressure contact with a part of the peripheral surface of the rotary shaft 16 only from the position direction. Fixed to.

[Effect of device]

In the electric shaver of the present invention, an elastic body 23b is provided on the inner circumference of a fixed frame portion 23a of a press-contact piece 23 which is fixedly fixed in the main body case 1 so as to surround the rotary shaft 16 of the motor 3, and this elastic body 23b is used as a motor. Since the rotary shaft 16 of FIG. 3 is pressed against only a part of the peripheral surface of the rotary shaft 16 from only one direction at all times, it is possible to well prevent the rotary shaft 16 from rattling in the bearing 30 of the motor 3 and to generate the rattling sound. It was possible to get rid of the noise and obtain a low-noise electric razor.

Further, since the press-contact piece 23 is preliminarily assembled to the motor 3 so as not to come off, as the motor 3 is fixed at a predetermined position in the main body case 1, the press-contact piece 23 causes the elastic body 23b to move to the peripheral surface of the rotary shaft 16. Easy to assemble so that it presses against a part,
The assembly work can be done reasonably and efficiently.

Further, an elastic body 23b that presses a part of the peripheral surface of the rotating shaft 16
Is provided on the press-contact piece 23 as described above, so that no special processing is required for the motor 3,
It is economical because the existing motor 3 can be used as it is.

[Brief description of drawings]

1 to 3 show an embodiment of an electric shaver according to the present invention. FIG. 1 is a front view showing a partially cutaway state, and FIG. 2 is a sectional view taken along line AA in FIG. FIG. 3 and FIG. 3 are exploded perspective views of essential parts. FIG. 4 is a vertical cross-sectional front view of the essential parts of another embodiment of the present invention. 5 and 6 show still another embodiment of the present invention. FIG. 5 is a vertical sectional front view of a main portion, and FIG. 6 is a perspective view of a motor. 1 ... Main body case, 3 ... Motor, 16 ... Rotating shaft, 23 ... Pressure contact piece, 23a ... Fixed frame part, 23b ... Elastic body.

Claims (1)

[Scope of utility model registration request] 1. A motor 3 for driving a razor blade and the motor 3
The pressure contact piece 23 temporarily assembled to the main body case 1 is housed in the main body case 1, and the pressure contact piece 23 is attached to the rotary shaft 16 of the motor 3.
6 includes a fixed frame portion 23a loosely fitted around the outer periphery of 6 and an elastic body 23b integrally protruding from the fixed frame portion 23a toward the inside, and is pressed against the rotating shaft 16. A holding means for retaining and holding the piece 23 is inserted, and in the press-contact piece 23, the elastic body 23b is positioned on the peripheral surface of the rotary shaft 16 in a state where the motor 3 is positioned and fixed at a predetermined position in the main body case 1. An electric razor characterized in that a fixed frame portion 23a is fixed in the main body case 1 so that a part of the fixed frame portion 23a is always pressed in only one direction.