JPS594150B2 - Drive structure of reciprocating razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive structure for a reciprocating razor, and its first purpose is to reduce the load when reciprocating the movable blade of the reciprocating razor. The second purpose is to prevent the elastic legs provided on the ζ base from buckling.

In the conventional reciprocating razor drive structure shown in Fig. 7, elastic leg openings hanging from both ends of the base are supported, so that the legs are moved by the pressing force applied to the movable blade. There is a problem that the base A does not move smoothly due to deformation and follows the driving force that makes the base A reciprocate, and the load increases. Also, there is a problem that a strong pressing force is applied, or the leg opening may be damaged due to creep phenomenon. There was a problem with giving in.

The present invention has been made in view of the above problems, and will be described below with reference to the drawings showing embodiments of the present invention.

In FIGS. 1 to 3, a movable blade 1 is connected to a drive frame 2 via a push-up spring 3. As shown in FIGS.

The base 4 is made of a synthetic resin material such as polyacetal resin to support the drive frame 2, and has first legs 5 from both ends,
On both sides of the first leg part 5, second leg parts 6, which are thinner and more elastic than the first leg part 5, are arranged parallel to and on the same plane as the first leg part 5.

The first leg 5 and the second leg 6 are connected by a connecting member 7 that extends from the first leg 5 and is integrally formed with the first leg 5 and the second leg 6. ing.

There are two methods of arranging the second leg portions 6: a method of arranging the second leg portions 6 on the same plane only on one side of the first leg portion 50; There is a method of arranging the second leg portions 6; The length can be shortened or shortened depending on the storage space.

The support member 8 is formed integrally with the second leg portion 6 and is engaged with an engagement protrusion 10 formed on the main body case 9.

A notch in which the first leg portion 5 is accommodated is formed in the support member 8, and the support member 8 and the base 4 are located on the same plane due to the notch.

Since the first leg 5 and the second leg 6 are supported in a suspended state, the leg 6 of the heat removal 2 is deformed and shortened when the base 4 moves back and forth, as shown in FIG. (The base 4 is lifted upward by the changed dimension, and the base 4 performs a reciprocating floating and sinking motion in a state where it is lifted on both sides of the reciprocating movement.

The outer cutter 11 with which the movable cutter 1 slides is made of a thin plate, so when it is bent, the apex of the curve warps into a saddle shape, as explained in the theory of thin plate bending (see Figure 6), and the outer cutter becomes saddle-shaped. Since the warpage of the movable blade 1 coincides with the up-and-down movement of the movable blade 1, the outer blade 11 and the movable blade 1 come into close contact with each other, resulting in a good cutting quality.

The bearing 12 is formed into an elastic arm 13 having mutually symmetrical arms 14 folded back into a U-shape, into which a drive shaft 17 connected to a rotating shaft 16 of a motor 15 is fitted.

The elastic arm 13 is formed on the lower surface of the base 4.

Since the elastic arms 13 are folded back, the load that deforms the elastic arms 13 is low, and the load component in the direction perpendicular to the direction of deformation of the second leg 5 and the direction perpendicular to the base 4 can be reduced.

In the embodiment, the bearings 12 are arranged on a plane parallel to the base 4, but in the case where the base 4 and the bearings 12 are arranged on the same plane, the motor 15 is positioned closer to the movable blade 1. This allows the overall length to be shortened, and since the center of gravity is located close to the movable blade 1, which has large vibrations, the vibration of the movable blade 1 can be reduced.

The drive shaft 17 is formed by cutting off the axis side of the rotation shaft 16 of the motor 15 to have an L-shaped cross section.
It is eccentric to the axis of 6.

If the drive shaft 17 is formed into a D-shaped rod as shown in FIG. 4, the grease contained in the bearing 12 will not be pushed out to the drive shaft 17, which has the effect of making it difficult to run out of oil.

The balancer 18 is provided in a part of the elastic arm 13,
The resonant frequency of the elastic arm is made to match the rotational speed to create a resonant state and reduce the degree C load.

The connecting piece 19 connects the folded portion 12 of the arm 14, and can prevent the arm 14 from spreading when the reciprocating direction of the movable blade 1 and the direction of the drive shaft 1T match, and the elastic arm 13 can be driven. It can deform smoothly following the movement of the shaft 17 and reduce the transmitted load.

The outer cutter 11 is attached to an outer cutter base 21.

Outer blade attachment part 22) Recess 23 formed in the outer blade base 21
A stopper 24 that fits into the outer cutter base 21 to lock the outer cutter base 21 to the main body case 9, and a spring body 25 that presses the stopper 24.
It is made up of.

Next, the operating state will be described. The drive shaft 17 connected to the rotating shaft 16 of the motor 15 performs an eccentric rotational movement and transmits force to the elastic arm 13.

Next, since the elastic arm 13 has little elasticity Li only in the direction perpendicular to the first and second legs 5 and 6, the drive shaft 17 The second leg portion 6 is elastically deformed to transmit reciprocating motion to the base 4.

A reciprocating razor drive device according to the present invention includes a pair of first legs provided at both ends of a base on which a movable blade is attached, and a pair of first legs arranged on the same plane as the first legs. Since the second leg portions with high elasticity are arranged, the second leg portions are fixed, and the second leg portions are protected by the first leg portions, they do not hang down from both ends of the conventional base. Compared to a device that supports legs with high elasticity, the base does not deform due to the pressing force applied to the movable blade, and the base follows the driving force even when pressing force is applied to the legs. It moves smoothly and has the effect of not increasing the load due to deformation of the legs, and also has the effect of not buckling due to the creep phenomenon of the legs.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention, in which FIG. 1 is a front view of a cross-sectional main part of a reciprocating razor, FIG. The figure is a partially cutaway external perspective view showing the bottom surface of the motion converter, Figure 4 is a diagram of a fitted state in which a D-shaped drive shaft is fitted into a bearing, Figure 5 is a diagram of an operating state, and Figure 6 is a diagram of a fitted state. is a perspective view of the outer cutter warped in a saddle shape;
The figure shows a conventional example. 1... Movable blade, 2... Drive frame, 4... Base, 5...
... first leg, 6... second leg, 8... support member, 12... bearing, 13... elastic arm, 14... arm, 15... motor, 16... Rotating shaft, 11... Drive shaft, 18... Balancer, 19... Connection piece, 20
...Folding section.

Claims (1)

[Scope of Claims] 1. A drive frame that connects the movable blade, a base that supports the drive frame, a pair of first legs provided at both ends of the base, and a pair of first legs provided at both ends of the base. a second leg arranged on the same plane and connected to the first leg and having greater elasticity than the first leg;
A reciprocating razor drive structure comprising a support member for fixing the legs of the reciprocating razor, a bearing formed on the base, and a drive shaft fitted to the bearing. 2. A reciprocating razor drive structure according to claim 1, wherein second leg sections are arranged on both sides of the first leg section. 3 The drive shaft is eccentric and the rotating shaft side of the motor is cut off.
2. A reciprocating razor drive structure according to claim 1, wherein the drive shaft is a rod shaped like a letter, and the drive shaft is fitted into a bearing with grease interposed therebetween. 4. The reciprocating razor according to claim 1, wherein the drive shaft is fitted into an elastic arm comprising a pair of mutually symmetrical arms that connect the bearing and the base by folding at least one or more of them. driving structure. 5. A reciprocating razor drive structure according to claim 4, wherein the folded portions of the arms are connected by a connecting piece. 6. The reciprocating razor drive structure according to claim 4, wherein the bearing and the base are arranged on the same plane or on planes parallel to each other. 7. A reciprocating razor drive structure according to claim 4, wherein the elastic arm is provided with a balancer.