JPH04108484A - Driving mechanism for reciprocating type electric razor - Google Patents

Abstract

PURPOSE:To improve the power transfer efficiency and to prevent the deterioration caused by secular change forming a connecting part of a driving lever and an arm by a ball joint. CONSTITUTION:A connecting part of a driving lever 5 and an arm 44 is constituted as a ball joint by a spherical ball 55 provided at the lower end of the driving lever 5, and a socket 45 formed as a recessed part whose inside surface is hemi-spherical in one end of the arm 44. Also, it is constituted so that the ball 55 fitted into the socket 45 can execute a three-dimensional motion against the socket 45. Moreover, as for the ball joint, even if the ball 55 is subjected to vertical motion in the socket 45 in connection with oscillation of the driving lever 5. a contact area of the ball 55 and the socket 45 is held large, and accordingly, the motion of the arm 44 is transferred to the driving lever 5 without waste.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an electric shaver, and more particularly to a drive mechanism in a reciprocating electric shaver.

[Conventional technology]

Some reciprocating electric shavers use a drive unit that is swingably supported and connected to one end of the inner cutter to drive the inner cutter back and forth with the rotation of a motor. In this type, the drive part is usually caused to swing by engaging an eccentrically rotating rotary drive part with a long hole at the other end of the drive part, which causes the inner cutter to reciprocate. However, in order to offset the motor, an eccentric shaft 4 is attached to the output shaft of the motor 4, as shown in FIG.
1, the middle part is supported by a shaft 50, and an inner cutter 3 is provided at one end.
There is one in which the other end of the drive unit 5 is connected to the other end of the drive unit 5 by an arm 44, and the drive unit 5 is oscillated via the arm 44. In this case, as the drive unit 5 swings, the drive unit 5 and the arm 4
4 changes, conventionally, as shown in FIG.
A hole 49 was provided to release stress.

[Problem to be solved by the invention]

However, although the above structure allows the drive section 5 to swing without causing twisting, the thin section 4
7 undergoes elastic deformation, the power transmission efficiency is poor, and there is a high risk that the thin wall portion 47 will deteriorate and break due to aging. Moreover, the shape of the arm inevitably becomes complicated. The present invention has been made in view of these points, and its purpose is to achieve excellent power transmission efficiency in a device that swings a drive unit via an arm, and to solve the problem of deterioration due to aging. The purpose of the present invention is to provide a drive mechanism for a reciprocating electric shaver that does not require any damage.

[Means for Solving the Problems] Accordingly, the present invention connects a drive section that is swingably supported and connected to an inner cutter at one end, and a rotary drive section that rotates eccentrically to the other end of the drive section. In the drive mechanism of a reciprocating electric shaver that converts eccentric rotation into a reciprocating rocking motion of the drive section and causes the inner cutter to reciprocate, the connecting section between the drive section and the arm is formed by a ball joint. The ball joint is composed of a ball formed in the driving part and a socket formed in the arm to receive the ball, and the ball protrudes from the tip of the ball through a small diameter part. The socket is provided with a rectangular locking engagement part, and the socket is provided with a rectangular insertion hole on the bottom surface that matches the engagement part and into which the engagement part is inserted, and the longitudinal direction of the engagement part and the insertion hole intersect. It has other characteristics. [Function] According to the present invention, since there is no place that undergoes elastic deformation,
The reciprocating motion component during the eccentric rotational motion is reliably transmitted to the drive unit, and other features include:
It is easy to assemble the arm and the drive part, and at the same time, the two do not separate. [Embodiment] The present invention will be described in detail below based on the illustrated embodiment. The main body 1 has a switch handle 8 on the side and a battery cover 7 slidably disposed on the bottom, and a thin outer blade on the top. A frame 14 is provided, and a cassette-type outer cutter 2 mounted on a carrier 20 is attached to the upper end of the outer cutter frame 14. Here, the outer cutter frame 14 is tapered so that the upper end becomes narrower, and when the outer cutter frame 14 is covered with a cap 15 to protect the outer cutter 2, the outer cutter frame 14 is also covered with the cap 15, and the main body Although the outer surface of the cap 1 and the outer surface of the cap 15 are made to be continuous with no difference in level, the outer surface of the outer cutter 2
The operating section for attaching and detaching the carrier 20 is the outer cutter frame 1.
4, the synthetic resin holder 16 attached to the inside of the cap 15 with double-sided adhesive tape 19 is attached to both ends of the synthetic resin holder 16 along each ridgeline of the side surface of the outer cutter frame 15. a pair of leg pieces 17 whose tips serve as elastic locking pieces for attaching the cap 15;
17 respectively, and the groove between both leg pieces 17 and 17 is used as a guide groove for the attachment/detachment operation section of the carrier 20, so that the cap 15 can be smoothly prevented from getting caught on the outer cutter frame 14 or the carrier 20 of the outer cutter 2. It is designed so that it can be covered with a cap 15. On the other hand, as is clear from FIG. 5, the main body 1 includes a pair of housings 11 and 12, which form a component placement space between opposing surfaces when assembled together, and a cylindrical cover 10 that is placed around both housings. Inside, one side in the width direction is a flat and elongated secondary battery 6 called a gum shape.
The lower part near the center on the other side is a storage area for the motor 4, and the side end on the other side is a storage area for the slide switch 8. A drive rod 5 constituting a drive mechanism for reciprocating movement is disposed at the upper center. The opening 13 formed in the housing 11 and 12 is the part into which the motor 4 fits during assembly, and due to the use of the flat secondary battery 6, the motor 6 is the thickest part. As is clear from FIG. 4, the thickness is limited, and is designed to be as small as possible. The housing section for the secondary battery 6 is formed so that the thickness direction of the secondary battery 6 and the thickness direction of the main body 1 coincide with each other so that the main body 1 can be made thinner, and the upper end thereof has a spring-like structure in the cathode metal fitting 87. A cathode terminal 88 as a battery contact spring having
As shown in FIG. 6, an elastic body 66 such as rubber is disposed on the surface facing the pressure spring piece 89 on the second side. The eight pressing spring pieces press the secondary battery 6 loaded into the storage chamber from the bottom side of the main body 1 against the elastic body 66 to eliminate rattling of the secondary battery 6. The slide switch 8 is attached to the housing 1112. A contact spring 80 is attached to the inner portion, and as shown in FIG. 7, it is integrally provided with a pair of elastic leg pieces 81 and 81. These elastic leg pieces 81, 81 have click protrusions 84, . 84 to give a click to the vertical movement of the slide switch 8,
Both ends of a U-shaped metal plate spring 82 are engaged with the tips of both elastic leg pieces 81, 81, respectively, so that both elastic leg pieces 81, 8
A spring force is applied in the direction of expanding 1. Due to the presence of the leaf spring 82, the click caused by the engagement of the elastic leg pieces 81, 81 with the click protrusion 84 is crisp and does not become flat. . The battery cover 7 disposed on the bottom is slidable by engaging guide grooves formed in the housing 11 and 12 on both sides thereof, and the anode of the secondary battery 6 is placed on the negative side. An anode metal fitting 70 that connects the motor metal fitting 86 and the motor metal fitting 86 is fixedly attached. The secondary battery 6 is loaded into the main body 1 by sliding the battery cover 6 to open the lower opening of the battery storage chamber, and then closing the battery cover 6 to close the lower opening. Anode of secondary battery 6 and motor fitting 8
This is done by connecting 6 with an anode fitting 70.
Since the secondary battery 6 loaded in the storage chamber is biased in the direction of protruding downward by the spring bias of the cathode terminal 88, an inclined surface 72 is formed on the edge of the battery cover 7. When the battery cover 7 is slid to close the storage chamber, the inclined surface 72 contacts the shoulder of the secondary battery 6 to push the secondary battery 6 deep. Therefore, the battery cover 7 is not caught on the secondary battery 6, and the battery cover 7 can be opened and closed smoothly. Further, an anode metal fitting 70 attached to the battery cover 7
A small protrusion provided on the motor fitting 86 forms an engaging portion 76 that engages, and when the battery cover 7 is closed, the protrusion falls into the engaging recess 76 and engages, thereby producing noise. This is so that the user can clearly determine whether or not the battery cover 7 is closed. The driving rod 5, which has a built-in spring 54 for pushing up the inner cutter 3 and whose upper end is connected to the inner cutter 3, is pivoted in the middle by a shaft 50 and a metal bearing 51, and the lower end is connected to the arm 44. It is connected to an eccentric shaft 41 with a balancer attached to the output shaft of the motor 4 via the shaft, and a weight 53 for canceling the inertia with the inner cutter 3 is attached to the lower part. The connection between the drive rod 5 and the arm 44 is formed by a spherical ball 55 provided at the lower end of the drive rod 5 and a socket 45 formed as a recess with a hemispherical inner surface at one end of the arm 44. Configured as a fitting, the socket 45
The bearing 52 in FIG. 6 is a ring disposed on the end face of the metal 51 so that the ball 55 fitted therein can move three-dimensionally relative to the socket 45. Therefore, if the secondary battery 6 and the motor 4 are connected and the motor 4 is rotated by operating the slide switch 8, the movement component in the left-right direction in FIG. 3 of the eccentric rotation of the eccentric shaft 41 will be 44 to the lower end of the drive rod 5 to swing the drive rod 5, and as a result, the inner cutter 3 attached to the upper end of the drive rod 5 reciprocates. At this time, the arm 44 and the driving rod 5 are connected by a ball joint, and even if the ball 55 moves up and down in the socket 45 as the driving rod 5 swings, the ball 55 remains connected to the ball 55. The contact area with the socket 45 is kept large, so the movement of the arm 44 is not wasted and the drive rod 5
The motion transmission efficiency is high. The connection between the arm 44 and the eccentric shaft 41, which is formed by inserting the eccentric shaft 41 freely into a hole at one end of the arm 44, is located on a line passing through the center of the ball 55. , in order to increase this motion transmission efficiency. The ball 55 in the ball joint is cut so that a part of its outer surface is flat, and an oil reservoir is formed between the inner surface of the socket 45 and this flat part 58, and the ball 55 and the socket are cut into a flat surface. The lubricating oil is always spread over the contact surface with 45. Further, a rectangular engagement portion 57 is integrally formed from the lower end of the ball 55 via a small-diameter shaft portion, and a rectangular engagement hole 46 is formed in the bottom surface of the socket 45. . This is to prevent the drive rod 5 from coming off from the arm 44. During assembly, the engaging portion 57 is inserted into the engaging hole 46 with the longitudinal direction of the engaging hole 46 and the engaging portion 57 aligned. If the hole 55 is fitted into the socket 45 and the arm 44 is then rotated 90' around the axis of the drive rod 5, the engagement hole 46 and the engagement part 57 will intersect and the ball will be released from the socket 45. 55 is prevented from coming off. The inner diameter of the hole in the arm 44 through which the eccentric shaft 41 is inserted is made smaller at the lower part of the motor 4 side where the balancer is provided, and larger at the upper part, so that the power is transmitted from the eccentric shaft 41 to the arm 44 or the lower part of the arm 44. The reason why this is done on the side is to minimize the influence when the eccentric shaft 41 is tilted. In the figure, 28 is a dustproof rubber.

【Effect of the invention】

As described above, in the present invention, since the connecting portion between the drive rod and the arm is formed by a ball joint, there is no wastage of force due to elastic deformation, and eccentric movement is reliably transmitted to the drive rod via the arm. It is something that will be done. In addition, a rectangular locking engagement part is provided at the tip of the ball of the ball joint through the small diameter part, and a rectangular insertion hole that matches the engagement part is inserted into the bottom of the socket. If the longitudinal direction of the engaging portion and the insertion hole are made to intersect with each other, the arm and the drive rod can be easily assembled, and at the same time, the two will not separate.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a perspective view of the same with the cap removed, and FIG. 3 is a longitudinal sectional view of the same,
Figure 4 is a cross-sectional view of the same as above, Figure 5 is an exploded perspective view of the same as above,
Figures 6 and 7 are cross-sectional views of the above, Figure 8 is a bottom view of the same, Figure 9 is a horizontal sectional view of the same, Figure 10 is a partial longitudinal sectional view of the same, and Figure 11 is a partial longitudinal sectional view of the same. 12 is a front view of the conventional example, and FIGS. 13(a) and 13(b) are a plan view and a front view of the same arm, in which 1 is the main body, 2 is the outer blade, and 3 is the front view of the conventional example.
is the inner blade, 4 is the motor, 5 is the drive rod, 44 is the arm, 45
indicates a socket, and 55 indicates a ball. Agent Patent Attorney Stone 1) Chief 71/Main body! - Outer mata J 3 Inner blade 44 - With arm 2 Figure 7 Figure 12 Figure 13

Claims (2)

[Claims] (1) Equipped with a drive rod that is swingably supported and has an inner cutter connected to one end, and an arm that connects the eccentrically rotating rotary drive section and the other end of the drive rod, the eccentric rotation of the drive rod is controlled by the drive rod. A drive mechanism for a reciprocating electric shaver that causes the inner cutter to reciprocate by converting it into a reciprocating rocking motion, the reciprocating electric shaver being characterized in that the connecting portion between the drive rod and the arm is formed by a ball joint. Drive mechanism. (2) The ball joint consists of a ball formed on the drive rod and a socket formed on the arm to receive the ball, and the ball has a rectangular locking engagement portion that protrudes through a small diameter portion at the tip of the ball. A claim characterized in that the socket has a rectangular insertion hole on its bottom surface that matches the engagement part and into which the engagement part is inserted, and the longitudinal directions of the engagement part and the insertion hole intersect. A drive mechanism for the reciprocating electric shaver according to item 1.