JPH051466U - Handheld electric cutter with reciprocating blade - Google Patents

Abstract

(57) [Abstract] [Purpose] Vibration damping and noise reduction are achieved by improving the material of the drive rod that connects the drive source of the reciprocating blade and the vibrator. In a hand-held electric cutter having a reciprocating blade, which includes a reciprocating blade 2, a drive source 5 for the reciprocating blade 2, and a vibrator 7 for transmitting the power of the drive source 5 to the reciprocating blade 2. The drive rod 16 that connects the reciprocating blade 2 and the vibrator 7 is formed of a rubber-like elastic body. As a result, it is possible to prevent the sound generated by the driving source 5 and the noise generated between the driving source 5 and the vibrator 7 from being transmitted from the reciprocating blade 2 to the outside of the case through the driving rod 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hand-held electric disconnector such as an electric razor or an electric hair clipper having a reciprocating blade, and has taken noise reduction measures in particular.

[0002]

[Prior Art]

 As this type of hand-held electric cutter, for example, a reciprocating electric shaver is disclosed in Japanese Patent Laid-Open No. 63-318988 and Japanese Utility Model Laid-Open No. 63-179967. There, the rotary motion of the motor is converted into a linear motion via an eccentric pin protruding from an eccentric cam on the motor shaft and a vibrator engaged with the eccentric pin, so that the forward and backward moving blades (inner blade) are moved. Although the motor reciprocates linearly, noise from the motor and noise from the eccentric pin striking the groove of the oscillator are generated, so to prevent these noises from going out of the case as much as possible. A sound insulation wall surrounds the connection between the transducer and the transducer.

[0003]

[Problems to be solved by the device]

 However, the noise of the motor and the knocking noise of the eccentric pin still go out of the case only by being shielded by the main body case and the sound insulation wall, so the noise reduction effect is limited. It is thought that one of the reasons for this is that these sounds are easily transmitted from the reciprocating blade to the outside of the case through the drive rod that connects the vibrator and the reciprocating blade. In particular, the drive rod is made of a solid plastic material such as polyacetal, which is integrally molded with the vibrator, with emphasis placed only on the rigidity of the power transmission member, so it is easy to transmit vibration. In addition, such a problem causes vibration noise even in the case where an electromagnet is used as a drive source in addition to a motor, and similarly in an electric hair clipper equipped with a vibrator for transmitting the power of the drive source to the reciprocating blade. The same can be said.

An object of the present invention is to reduce vibration and reduce noise by improving the material of the driving rod that connects the reciprocating blade and the vibrator in the hand-held electric cutter having the reciprocating blade as described above. There is a point to try.

[0005]

[Means for Solving the Problems]

 The present invention, as illustrated in FIG. 1, includes a reciprocating blade 2, a driving source 5 for the reciprocating blade 2, and a vibrator 7 for transmitting the power of the driving source 5 to the reciprocating blade 2. A drive rod 16 for connecting the reciprocating blade 2 and the vibrator 7 is formed on the premise of an electric type electric breaker, and is made of a material having rubber-like elasticity such as natural rubber or synthetic rubber.

[0006]

[Action]

 Since the drive rod 16 made of a rubber-like elastic material has a function of damping vibration, it suppresses the sound generated by the drive source 5 and the sound generated between the drive source 5 and the vibrator 7 from being transmitted to the reciprocating blade 2. Will be done.

[0007]

[Effect of the device]

 Therefore, according to the present invention, since the drive rod 16 is formed of the rubber-like elastic material, the sound of the drive source 5 and the sound generated at the connecting portion of the drive source 5 and the vibrator 7 are generated from the reciprocating blade 2. It is possible to well prevent it from going out of the case, which is a great effect of reducing noise.

[0008]

【Example】

 A case where the embodiment of the present invention is applied to a reciprocating electric shaver will be described. In FIG. 1, reference numeral 1 denotes a main body case, which is provided with a reciprocating blade 2 above the main body case 1 and has a mesh-like outer blade 3 covering the reciprocating blade 2 above the main body case 1. On the other hand, the outer blade holder 4 is detachably attached.

Inside the main body case 1, the motor 5 that is the drive source of the reciprocating blade 2, the battery 6 that is the power source of the motor 5, and the rotation of the motor 5 are converted into reciprocating motion of the reciprocating blade 2 in the left-right direction A and transmitted. The vibrator 7 and the like are stored.

The motor 5 is fixed to a motor mounting base 9 in the main body case 1, and the vibrator 7 is arranged above the motor mounting base 9. An eccentric cam 11 is fixed to the rotary shaft 10 protruding from the upper end of the motor 5, and an eccentric pin 12 is provided so as to project from the upper end surface of the eccentric cam 11. On the other hand, the vibrator 7 is a plastic molded product, and thin thin elastically deformable legs 14 are integrally extended upward from the left and right ends of the vibrator body 13, and the upper ends 14a of both legs 14 and 14 are connected to the body case. It is fixed at 1. A groove 15 is provided in the front-rear direction at a portion of the lower surface of the vibrator main body 13 which is offset in the left-right direction, and the eccentric pin 12 is engaged with the groove 15. As a result, when the motor 5 rotates, the eccentric pin 12 slides back and forth in the groove 15 so that the vibrator 7 reciprocates horizontally in the horizontal direction via elastic deformation of the legs 14 and 14.

A drive rod 16 made of a rubber-like elastic material is provided so as to project upward at the center portion of the upper surface of the vibrator 7 in the left-right direction. Make it stick out. The reciprocating blade 2 is detachably connected to the projecting end of the drive rod 16 via a reciprocating blade holder 19 below the reciprocating blade 2. The reciprocating blade holder 19 can be formed separately from the reciprocating blade 2 shown in FIG. 1, or can be formed integrally with the reciprocating blade 2 as shown in FIGS. 3 and 7. Therefore, with the reciprocating vibration of the vibrator 7, the reciprocating blade 2 slides on the inner surface of the outer blade 3 and reciprocates linearly in the left-right direction A.

A separate hair blocking plate 20 is inserted into the drive rod 16 and the gap between the drive rod 16 and the opening 17 is closed by the hair blocking plate 20 so that the outer blade 3 It prevents the dust generated by cutting between the reciprocating blade 2 and the reciprocating blade 2 from entering the main body case 1. A coil-shaped push-up spring 21 for constantly pushing up the reciprocating blade 2 is interposed between the bristles 20 and the reciprocating blade holder 19.

The vibrator 7 is formed of a plastic material such as polybutyl terephthalate, nylon, or polyacetal, whereas the drive rod 16 has a shore hardness of 50 ° or less, which is lower than the shore hardness of the plastic material. It is molded from a rubber-like elastic material of 80 °, preferably 60 °, and its flanged base portion 16a is fitted and fixed in a hole 22 provided in the vibrator 7 in a slip-proof manner. This is because a rubber-like elastic material having a Shore hardness of less than 50 ° reduces the rigidity of the drive rod 16 as a power transmission function, and a rubber hardness higher than the Shore hardness has a small vibration damping effect.

Specifically, as the rubber-like elastic material, butyl rubber is preferable because it has an appropriate rigidity and is most excellent in the vibration damping effect. In addition, nitrile rubber (NBR), ethylene propylene rubber, fluororubber It can also be formed using chloroprene rubber, styrene rubber, fluorosilicone rubber, silicone rubber, polyacrylate rubber, polyurethane rubber or the like. Of course, in addition to the cross-linking or vulcanizing type rubber as described above, it is also possible to use a thermoplastic elastomer having rubber-like elasticity that is injection-moldable or blow-moldable, that is, a so-called engineering elastomer. Elastomers such as polyester-based, polyolefin-based, vinyl chloride-based, polyurethane-based, and styrene-based elastomers are preferable as these elastomers.

Since the driving rod 16 formed of a rubber-like elastic body has a function of damping a slight vibration, a sound generated by the motor 5 or a sound generated by the eccentric pin 12 hitting the groove 15 of the vibrator 7 is generated. It has become possible to suppress the noise from the vehicle through the drive rod 16 and out of the case as much as possible.

FIG. 2 shows a modified embodiment of the drive rod 16. There, the bristle stopper plate 20 is integrally formed from the rubber elastic body on the drive rod 16 by integral molding or double molding. Further, by forming the base portion 16b of the base portion 16a of the drive rod 16 connected to the oscillator 7 in a cross-sectional shape having a large diameter in the left-right direction A, the deflection shape of the drive rod 16 in the left-right reciprocating direction is prevented. ing.

3 and 4 show another modified embodiment of the drive rod 16. In this embodiment, the driving rod 16 is formed of a rubber-like elastic body into a T-shape in a front view, which is composed of a horizontal portion 23 and a vertical portion 24 which integrally protrudes downward from the horizontal portion 23 at a right angle. A concave portion 25 is provided in the concave portion 25, and the horizontal portion 23 of the drive rod 16 is integrally fitted and fixed in the concave portion 25, and the vertical portion 24 is inserted into and removed from a cylindrical boss 26 that integrally projects from the vibrator 7. It is possible to combine. As shown in FIG. 4, between the mating surfaces of the horizontal portion 23 of the drive rod 16 and the inner surface of the recess 25 of the reciprocating blade holder 19, there are several small recesses 27 provided on one side and the other on the other side. The convex 29 is press fitted. A groove 30 is provided on the outer periphery of the vertical portion 24 of the drive rod 16, and a C-shaped retaining ring 31 fixed to the inner periphery of the boss 26 is fitted into the groove 30 so that the drive rod 16 is recessed. It is inserted freely up and down by the vertical length of 30, and a coil-shaped push-up spring 21 is interposed between the lower end of the vertical portion 24 and the inner bottom of the boss 26 of the vibrator 7. The drive rod 16 is constantly pushed up and biased.

Further, in this embodiment, a connecting rod 33 is pivotally supported around the pin 34 on the lower surface side of the vibrator 7 between the vibrator 7 and the eccentric pin 12 so as to be horizontally swingable, and the connecting rod 33 is rocked. The eccentric pin 12 is inserted into the hole 35 provided on the moving tip side so that the rotation of the motor 5 can be transmitted to the vibrator 7 via the eccentric pin 12 and the connecting rod 33.

Further, in this embodiment, the vertical portion 24 of the drive rod 16 has a cross-sectional shape which is long in the reciprocating direction so as not to be flexed and deformed in the left-right reciprocating direction A as shown in FIG. 5 (A). It is formed in a rectangular cross section having a long side or an elliptical cross section having a long axis in the left-right reciprocating direction A as shown in FIG. Alternatively, as shown in FIG. 6, when the drive rod 16 is formed to have a square cross section or a circular cross section, the drive rod 16 is flexibly deformed in the left-right reciprocating direction A at the base portion of the drive rod 16 which is connected to the vibrator 7. It is also possible to provide a reinforcing rib 36 for preventing this.

7 and 8 show a further modified embodiment of the drive rod 16. When the reciprocating blade 2 is replaced, the reciprocating blade 2 can be removed from the upper end of the drive rod 16 in the case shown in FIG. 1, and the reciprocating blade 2 and the drive rod 16 can be integrated in the case shown in FIG. The vertical portion 24 of the drive rod 16 can be detached from the vibrator 7. However, in this embodiment, the reciprocating blade 2 can be detached from the drive rod 16 and the drive rod 16 can be vibrated. It can be removed from the child 7. That is, the drive rod 16 has an upper half 37 formed in a rectangular cross section and a lower half 38 formed in a circular cross section. An elliptical cross section 39 formed at the upper end of the upper half 37 of the reciprocating blade holder 19 is provided. A recess 40 provided in the central portion of the lower surface is removably fitted and coupled, and a lower half portion 38 thereof is removably inserted and coupled to a boss 26 protruding from the central portion of the vibrator 7 via a stop ring 31.

Further, in this embodiment, the middle portion of the upper half portion 37 of the drive rod 16 is provided with a through hole 41 penetrating in the left-right reciprocating direction A, and a thin portion 42 expanding in the front-back direction orthogonal to the direction A is formed. The drive rod 16 receives compression from the reciprocating blade 2 by forming a thin hole portion 44 formed in the middle portion of the lower half portion 38 and penetrating in the front-rear direction and expanding in the left-right reciprocating direction A. It is assumed that the upper and lower thin-walled portions 42 and 44 exert a spring action under the load, and thus the push-up spring 21 as shown in FIGS. 1 and 3 need not be additionally mounted. In this case, only one of the upper thin portion 42 and the lower thin portion 44 may be provided.

FIG. 9 shows still another modification of the drive rod 16. In this modification, the stainless steel plate 45 is insert-molded and reinforced so that the plate thickness direction thereof is orthogonal to the left-right reciprocating direction A. Even when a low-hardness flexible rubber material is used as the rubber-like elastic body, the flexural deformation in the left-right reciprocating direction A is suppressed. The lower end of the drive rod 16 is formed in a polygonal shape and is joined to the vibrator 7 in a rotationally fixed manner so that the stainless steel plate 45 maintains the above-described fixed orientation.

FIG. 10 shows another modification of the drive rod 16. Since the drive rod 16 has a resonance frequency when integrally molded from the same rubber-like elastic material, it is more preferable that the drive rod 16 is formed by combining rubber-like elastic bodies having different rubber hardnesses and different natural frequencies. In this way, the attenuation range of the transmission frequency can be expanded. For example, the upper and lower rubber-like elastic bodies 46 and 47 have a shore hardness of 60 °, and the rubber-like elastic body 48 to be joined and arranged in the middle has a shore hardness of 45 °.

The drive source may be an electromagnet instead of the motor 5, and the same applies to an electric hair clipper or a lawn mower having a reciprocating blade and a vibrator, as in the forward / backward moving electric shaver. Applicable to

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part.

FIG. 2 is a vertical cross-sectional front view of essential parts showing another embodiment.

FIG. 3 is a vertical cross-sectional front view of essential parts showing still another embodiment.

FIG. 4 is an exploded perspective view of the drive rod shown in FIG.

5 is a sectional view taken along line XX in FIG.

FIG. 6 is a perspective view showing still another embodiment.

FIG. 7 is a vertical cross-sectional front view of a main part of another embodiment.

8 is an exploded perspective view of the drive rod shown in FIG.

FIG. 9 is a perspective view of a drive rod showing still another embodiment.

FIG. 10 is a vertical sectional front view of a drive rod showing still another embodiment.

[Explanation of symbols]

 1 main body case 2 reciprocating blade 7 oscillator 16 drive rod

Claims (1)

【Claims for utility model registration】 【Claim 1】 Reciprocating blade 2, drive source 5 for reciprocating blade 2,
And a vibrator 7 for transmitting the power of the driving source 5 to the reciprocating blade 2.
And a drive rod 16 connecting the reciprocating blade 2 and the vibrator 7 is made of a material having rubber-like elasticity.