JPS6136221Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reciprocating electric shaver, and more particularly to a connection structure between a motor and a driver that converts the rotational motion of a built-in motor into reciprocating motion of an inner cutter block.

Generally, an electric shaver having a structure in which rotational motion of a motor is converted into reciprocating motion of an inner cutter block by a driver is disclosed in Japanese Patent Laid-Open No. 168781/1983. Driver element 10 in this kind of electric shaver
For example, as shown in FIG. 1, elastic arms 1 extend from both longitudinal ends of a rigid substrate 12.
3 to the housing 1 and directly connected to the motor 8. By fitting the output shaft 9b of the eccentric cam 9a into the shaft hole 15 provided at one place on the board 12, the motor 8
The rotational motion is converted into a reciprocating motion of the substrate 12, which vibrates along the longitudinal direction while bending both elastic arms 13. By the way, centering the output shaft 9b of such an eccentric cam 9a, that is,
Since alignment with the shaft hole 15 is difficult, the current practice is to provide a clearance between the output shaft 9b and the shaft hole 15, as shown in FIG. When the board 12 is not allowed to deform to some extent, such as when the board 12 is thick, this clearance remains and the output shaft 9b and the shaft hole 15 do not come into close contact with each other, and as a result, when the motor 8 is driven, There was a problem in that the generated thrust of the motor caused a dancing sound, which increased the noise when the electric shaver was used.

The present invention was developed in view of the above points, and its main purpose is to convert the rotary motion of the motor into the reciprocating motion of the inner cutter block through the shaft hole provided in the drive element. To provide a reciprocating electric shaver in which the output shaft of the motor is fitted in a tight-fitting structure to prevent the generation of dancing noise due to the thrust of the motor, thereby reducing noise during use.

The present invention will be explained in detail below based on embodiments shown in the figures. The reciprocating electric shaver according to the present invention has a third
As shown in the figure below, there is a housing 1 with a blade holder 4 formed on its upper surface and a motor 8 housed inside, an outer cutter block 2 disposed on the blade holder 4, and a blade holder 4 that is reciprocally driven on the upper surface. an inner cutter block 3 that slides into contact with the inner surface of the outer cutter of the outer cutter block 2; a driver 10 that connects the inner cutter block 3 and the motor 8 and converts the rotational motion of the motor 8 into reciprocating motion of the inner cutter block 3; Equipped with
The drive element 10 is formed into a shape in which an elastic leg 13 exhibiting elasticity extends from the end of a substrate 12 exhibiting rigidity.The free end of the elastic leg 13 is fixed to the housing 1, and the substrate 12 is connected to the blade holder 4. The substrate 12 is housed in the housing 1 in a substantially parallel manner, and a part of the substrate 12 is connected to the inner cutter block 3 through the blade holder 4. The output shaft 9b of an eccentric cam 9a rotated by a motor 8 is located at one place on the substrate The eccentric movement of the output shaft 9b that is fitted into the vertically penetrating shaft hole 15 that has been formed is converted into the reciprocating motion of the substrate 12 that vibrates while bending both of the elastic legs 13, and the edge portion 15a at the upper edge of the shaft hole 15 is and shaft hole 15
It is characterized in that the edge portions 15b of the lower edge are pressed against the upper and lower ends of the output shaft 9b, respectively, at positions opposite to each other on a line along the longitudinal direction of the substrate 12. As shown in Figure 3 and below, this reciprocating electric shaver consists of a thin housing 1 whose front and back length is much shorter than its height and width, and an outer blade attached to the top of the housing 1. This electric shaver is composed of a block 2 and an inner cutter block 3 that is reciprocated along the inner surface of the outer cutter block 2. The housing 1 consists of a pair of halves 1
A and 1B are joined together, and in addition to a storage battery 6 and a motor 8, a plug block 20 equipped with a plug blade 21 for charging and a circuit block 22 equipped with electronic parts for charging are housed inside. Storage battery 6, motor 8,
The plug block 20 and the circuit block 22 are electrically connected on a chassis 26 built into the housing 1, and a switch terminal 27 is formed at one place on the chassis 26, and a switch handle 30 is provided on the outer surface of the housing 1 and slides up and down. The contact plate 31 constitutes a switch that opens and closes a power supply circuit including the motor 8 and the storage battery 6. On the other hand, the outer cutter block 2 has a semicylindrical shape and is constructed by attaching a thin plate-like outer cutter 2b to an outer cutter frame 2a which is detachably attached to the upper surface of the housing 1, and is detachably attached to the upper surface of the housing 1. The above-mentioned driver 10 is housed in the housing 1 with both ends fixed to the upper end of the housing 1, and the connecting cylinder 11 formed as a part of the driver 10 is inserted upward through the opening 5 in the center of the blade holder 4 on the upper surface of the housing 1. This connecting cylinder 11 protrudes
An inner cutter block 3 is detachably connected to the inner cutter block 3. This drive element 10 is basically molded of synthetic resin into a shape in which substantially U-shaped elastic legs 13 exhibiting elasticity extend from both longitudinal ends of a rectangular substrate 12 exhibiting rigidity, and the upper end of each elastic leg 13. The mounting pieces 14 exhibiting rigidity are fixed to the protrusions 4a at both ends of the blade holder 4, respectively, and are installed in the housing 1. The output shaft 9b of the eccentric cam 9a, which is directly connected to the
As the motor 8 rotates, the substrate 12 is reciprocated left and right while bending both elastic legs 13. On the other hand, the connecting cylinder 11 is a cylindrical body integrally molded onto the substrate 12 with a part of its lower end protruding below the substrate 12, and has an open top surface and a closed bottom surface, and a boss 19 protrudes from the center of the inner bottom surface. A pair of diametrically opposed pin holes 18 are formed in the peripheral wall. On the other hand, the inner cutter block 3 is formed by arranging a large number of inner cutters 3b on an inner cutter frame 3a, and as shown in FIG. A bushing 36 is attached to a pin 35 that connects the bushing 36 to the drive element 1, as shown in the figure.
0 into the connecting cylinder 11, and the pin 35
The inner cutter block 3 is fitted into the pin hole 18 and attached to the drive element 10, and is pushed up by a push-up spring 38 housed between the bottom of the connecting cylinder 11 and the bush 36
is spring biased upward. A coil spring is used for this spring 38, and the spring 38 is positioned at the center of the bottom of the connecting cylinder 11 by the boss 19 fitted into the lower end. By the way, the shaft hole 1 of the driver 10
5 is a long hole running in the width direction on one side of the substrate 12 and open at both upper and lower ends, as shown in FIG. As a result, a motion component along the width direction of the substrate 12 is absorbed within the shaft hole 15, and the movement component of the substrate 12 is absorbed in the shaft hole 15.
2 is transmitted to the substrate 12, and the substrate 12, that is, the driver 10, is reciprocated within the housing 1 while bending the elastic legs 13 at both ends. The width of the shaft hole 15 is set to be uniform over the entire length and slightly wider than the diameter of the output shaft 9b, so that the output shaft 9b can be easily fitted into the shaft hole 15 during assembly. Although this substrate 12 basically has sufficient rigidity to perform the above-mentioned reciprocating motion,
When the inner cutter block 3 is connected to the base plate 12 as described above, it has a slight elastic deformability that allows it to be deformed into a shape slightly tilted from horizontal as shown in FIG. There is. That is, when the inner cutter block 3 is attached to the base plate 12, the connecting tube 11
The board 12 is bent by the reaction force of the spring 38 housed in the spring 38, and as a result, the output shaft 9 is bent as shown in the figure.
The upper and lower portions of b are in pressure contact with the upper and lower edge portions 15a and 15b of the shaft hole 15 on the left and right opposite sides, respectively, so that a close fit can be achieved between the output shaft 9b and the shaft hole 15, and therefore,
The thrust of the motor 8 can be absorbed by the fitting portion between the output shaft 9b and the shaft hole 15, and the generation of the rattling noise caused by the thrust of the motor 8 can be eliminated. A dustproof cushion 39 is housed between the periphery of the opening 5 of the blade holder 4 from which the connecting tube 11 projects and the base plate 12 to prevent the beard debris that accumulates on the blade holder 4 from entering the housing 1. is prevented.

As described above, in the present invention, the shaft hole is formed at a position where the edge portion of the upper edge of the shaft hole formed in the drive element and the edge portion of the lower edge of the shaft hole are opposite to each other on a line along the longitudinal direction of the substrate. Since the upper and lower ends of the output shaft that is inserted into the shaft are pressed against each other, a tight fit is obtained between the output shaft and the shaft hole, and therefore the thrust generated when the motor is driven can be absorbed by this fitting part. As a result, it is possible to eliminate the dancing noise caused by the thrust of the motor, which is seen in conventional motors.
It has the advantage of reducing the noise of electric shavers.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional example, Fig. 2 is a partially enlarged schematic diagram of the same as above, Fig. 3 is a perspective view showing an embodiment of the present invention, Fig. 4 is a longitudinal cross-sectional view of the same as above, Fig. 5 is a cross-sectional view taken along the line A-A in FIG. 4, FIG. 6 is a perspective view showing the driver used in the above, and FIG. 7 is a partially enlarged view showing the connection point between the driver and the motor in the above. 1 is a housing, 2 is an outer cutter block, 3 is an inner cutter block, 4 is a cutter holder, 5 is an opening, 9a is an eccentric cam, 9
b is an output shaft, 10 is a driver, 11 is a connecting cylinder, 12
1 is a substrate, 13 is an elastic leg, 15 is a shaft hole, 15a, 1
5b is an edge portion.

Claims (1)

[Scope of utility model registration request] A housing that forms a blade holder on the top surface and houses a motor inside, an outer cutter block placed on the blade holder, and an inner blade that is reciprocated on the top surface of the blade holder and slides into contact with the inner surface of the outer cutter of the outer cutter block. and a driver that connects the inner cutter block and the motor and converts the rotational motion of the motor into reciprocating motion of the inner cutter block, and the driver has elastic legs that are more elastic than the ends of the rigid substrate. The free ends of the elastic legs are fixed to the housing, and the board is placed in the housing approximately parallel to the blade holder, and a part of the board passes through the blade holder and connects to the inner blade block. The output shaft of the connected eccentric cam, which is rotated by a motor, is fitted into a vertically penetrating shaft hole formed in one place on the board, and the eccentric movement of the output shaft causes the board to vibrate while deflecting both elastic legs. The output shaft is converted into a reciprocating motion, and the edge portion of the upper edge of the shaft hole and the edge portion of the lower edge of the shaft hole are respectively opposite to each other on a line along the longitudinal direction of the substrate. A reciprocating electric shaver with pressure contact.