JPS5927264Y2 - Drive mechanism of small electrical equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a drive mechanism for a small electric appliance such as a reciprocating electric shaver, and more specifically to an improvement in a mechanism for converting rotational motion into reciprocating motion.

For example, as a movable blade drive mechanism for a reciprocating electric shaver, as shown in FIG. It is rotatably supported on a shaft 38 fixed between walls 36 and 37, and a cylindrical eccentric cam 39 is integrally formed on the upper surface of the driven gear 34, and is connected to a movable blade (not shown). A cylindrical cam receiver 41 is formed at the base end of the lever 40, and by fitting this cam receiver 41 to the eccentric cam 39, the rotational force of the motor 31 is transferred as indicated by the arrow a.
There is one that converts it into linear reciprocating motion in the direction and transmits it to the movable blade.

By the way, in the above configuration, if a gap G exists between the cam receiver 41 and the upper wall 36 of the gear holder 35,
Since there is a risk that the cam receiver 41 may deviate from the eccentric cam 39 or shake in the vertical direction, a separately prepared spacer member 42 is installed between the cam receiver 41 and the upper wall 36 to prevent this. In addition, the presence of the spacer member 42 may cause the friction surface to become twisted, increasing the load on the motor 3.
Furthermore, if the thickness adjustment of the spacer member 42 is not strictly controlled, there will be various drawbacks such as the generation of noise due to rattling.

Therefore, this invention extends the upper end of the cylindrical cam receiver so as to come into contact with the earthen wall of the gear holder, and uses the inner space of this extended part as a storage space for lubricant, thereby improving the conventional method. The defects have been removed.

An embodiment of this invention will be described below with reference to the drawings.

Fig. 1 shows a reciprocating electric razor exclusively used for shaving eyebrows. It consists of a body storage section 3, and a power source battery (
(not shown) and a drive mechanism 5 (see Figure 2) that converts the rotational force of the motor 4 into linear reciprocating motion.
The blade housing 3 is equipped with a blade block 9 for shaving eyebrows, which includes movable and fixed blades 6, 7, a patch plate 8 for the movable blade 6, and the like.

Reference numeral 10 designates a power switch (not shown) for the motor 5.

Reference numerals 11 and 12 designate a driving gear and a driven gear that constitute a part of the drive mechanism 5. The driving gear 11 is fixed to the rotating shaft 13 of the motor 4, and the driven gear 12 is connected to the upper and lower opposing walls 15 of the gear holder 14, It is rotatably supported by a shaft body 17 fixed between 16 and meshed with the drive gear 11.

18 is a lever that drives the movable blade 6;
An engagement protrusion 19 formed at the tip of the movable blade 6 is engaged with an engagement hole 20 formed at the rear end of the movable blade 6, and the lever 1
A cylindrical cam receiver 21 formed at the base end of the driven gear 8 is fitted into a cylindrical eccentric cam 22 integrally formed on the upper surface of the driven gear 12.

The upper end 21a of the cylindrical cam receiver 21 extends at a position where it contacts the upper wall 15 of the gear holder 14, and the inner space 23 of the extended cylindrical upper end 21a is filled with lubricant M. The storage space is configured as a storage space filled with a lubricant M such as silicone grease.

The motor 4 is connected to the gear holder 14 by screws 29, 29.
After temporarily fixing it to the base 24 of the motor 4 and the base 24, insert the screws 29 and 29 between the motor 4 and the base 24 into the notches 26, 26 of the vertical wall 25 formed in the main body case 1, and then screw these screws together. 23. By tightening 23, the motor 4 is assembled into the main body case 1 together with the gear holder 14.

In addition, 27 is the upper and lower facing plates 15 and 16 of the gear holder 14.
A reinforcing member 28 that prevents zero deflection deformation is a thin wall portion formed on the lever 18, and absorbs changes in the height direction of the lever 18 when the movable blade 6 arranged at an angle is pulled back. It is for the purpose of

In the above configuration, when the motor 4 rotates, it is decelerated by the driven gear 12 meshed with the driving gear 11, and the eccentric cam 2
Since the lever 2 rotates, the lever 18 with the cam receiver 21 fitted to the cam 22 moves linearly and reciprocally in the direction of the arrow a, thereby driving the movable blade 6.

Here, since the upper end 21a of the cam receiver 21 is brought into contact with the upper wall 15 of the gear holder 14, the cam receiver 21 does not come off when the eccentric cam 220 rotates without the need to prepare a separate spacer member. In particular, since the inner space 23 of the cylindrical upper end portion 21a is filled with the lubricant M, the rotation of the eccentric cam 220 causes the lubricant M to move between the eccentric cam 22 and the cam receiver 21 due to centrifugal force. Contact surface P with
The lubricant M not only penetrates into the cam 22 to smoothly rotate the cam 22, but also leaks into the contact surface P2 between the cylindrical upper end portion 21a and the upper wall 15 of the gear holder 14.

For this reason, the upper wall 15 of the gear holder 14 and the cylindrical upper end portion 21
Since the contact surface P2 with the cylindrical cam receiver 21 constantly moves due to the eccentric rotation of the cylindrical cam receiver 21, the lubricant M is sequentially applied to the contact surface P2 according to the amount of eccentric movement of the cylindrical cam receiver 21. This makes it possible to supply a wide range to the contact surface P2, making eccentric rotation extremely smooth, suppressing wear on the contact surfaces P1 and P2, and increasing the durability of the parts. , each of the above contact surfaces P
The cushioning effect of the lubricant M adhering to P 1 and P 2 can effectively suppress the rattling noise caused by the cam receiver 21 during driving.

Although the above embodiment has been described using the drive mechanism of a reciprocating electric shaver as an example, similar effects can be achieved by adopting a similar configuration for the drive mechanism of other small electric devices.

As described above, this invention extends the upper end of the cylindrical cam receiver fitted to the eccentric cam portion on the upper surface of the driven gear so that it comes into contact with the earthen wall of the gear holder holding the driven gear, By filling the extended cylindrical upper end with lubricant, the number of parts is reduced, load increase and wear of each part are suppressed, and the generation of noise can be reliably prevented in small electrical equipment. The drive mechanism can be easily manufactured and provided.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of main parts showing an example of a reciprocating electric shaver to which the drive mechanism of a small electric device according to this invention is applied;
The figure is an exploded perspective view of the main parts, and FIG. 3 is an explanatory diagram of a conventional example. 6... Driven body, 11... Drive gear,
12... Driven gear, 14... Gear holder, 15, 16... Opposing wall, 18...
Lever, 21...Cam receiver, 21a...
・Cylindrical upper end, 22... Eccentric cam, 23...
...Inner space (lubricant storage space), M...Lubricant.

Claims (1)

[Scope of utility model registration request] A driven gear 12 rotatably supported between upper and lower opposing walls 15 and 16 of the gear holder 14 and meshed with the driving gear 11; a cylindrical eccentric cam 22 formed on the upper surface of the driven gear 12; The upper end portion 21 of the cam receiver 21 includes a cylindrical cam receiver 21 fitted to the eccentric cam 22 and a lever 18 that connects the cam receiver 21 side and the driven body 6 side.
A is extended at a position 1 where it contacts the upper wall 15 of the gear holder 14, and the inner space of the extended cylindrical upper end 21a is configured as a storage space 23 for a lubricant M. .