JP3443745B2 - Rotary electric razor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric shaver having a cylindrical rotary inner blade, and an improved support means for the rotary inner blade. is there. 2. Description of the Related Art A rotary electric shaver, like other rotary or reciprocating electric shavers, can rotate even when the outer blade is pressed against or separated from the skin during shaving. In order to improve the sharpness, it is necessary that the blade is installed so as to be able to float up and down following the vertical movement of the outer blade so that the blade always keeps a close contact with the inner surface of the outer blade. As described above, the drive motor is fixed in the main body case, and the rotary inner blade is provided with a drive transmission mechanism for transmitting the output of the motor to the rotary inner blade as a means for providing the rotary inner blade of the rotary electric shaver so as to be able to float up and down. There is a case in which the case is provided so as to be free to float (see Japanese Patent Application Laid-Open No. 53-123267). Further, there is also a device in which a motor, a drive transmission mechanism, and a rotary inner blade are integrally combined to form a unit, and the unit is provided so as to be freely floatable with respect to a main body case (for example, see Japanese Patent Application Laid-Open No. 3-140184) ). [0003] However, in the former of the above-mentioned conventional examples, since the rotary inner blade is integrally combined with the drive transmission mechanism, the rotary inner blade can be cleaned. However, there is a disadvantage that it cannot be removed even when it is replaced. In the latter case, the rotary inner blade can be removed from the unit, but the removal requires a little troublesome work. That is, in this case, the shaft at one end of the rotating inner blade is made to be freely insertable / removable in the axial direction with respect to the bearing on the main body case side, and is prevented from coming off by a lock provided on the bearing housing on the main body case side,
According to this, when removing, operate the lock with one hand,
With the other hand, the rotating inner blade must be pulled out in the axial direction. For this reason, it is necessary to use both hands when attaching and detaching the rotating inner blade, there is a risk of accidentally dropping the main body case, and a rotating inner blade with a cutting blade attached in the same direction as the axial direction for inserting and removing in the axial direction You may be injured. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary electric shaver having a cylindrical rotary inner blade as described above, in which the supporting means for the rotary inner blade is further developed and improved, thereby simplifying the attaching / detaching operation and improving safety. The point is to aim at. In the rotary electric shaver of the present invention, the horizontal shaft 9 at one end of the rotary inner blade 4 is arranged at a predetermined position on the main body case 1 as shown in the figure. It is mounted on a bearing means 26 which is elastically movable in the vertical direction, and a driven friction wheel 27 is fixed to the horizontal shaft 10 at the other end of the rotary inner blade 4 . The drive transmission mechanism 6 of the rotary inner blade 4 has a sun gear 14 that is driven to rotate by the drive motor 5.
7, the sun gear shaft 13 and the planetary gear shaft 16 are connected by the arm 19, and the driving friction wheel 20 is fixed on the planetary gear shaft 16. An idle friction wheel 22 is mounted on an idle friction axle 21 arranged in parallel with the planetary gear shaft 16 as a driving friction wheel 2.
0 is fixed to the near contact, and movably idling friction wheel 22 around the sun gear shaft 13. The driving friction wheel 20 and the idle friction wheel 22 are attracted to each other by a spring member 24. Thus, the driven friction wheel 27 is
And the idler friction wheel 22. The driving friction wheel 20 and the idle friction wheel 22 which are attracted to each other by the spring member 24 are pressed against the driven friction wheel 27, and the entire rotating inner blade 4 is accompanied by an upward elastic restoring force of the bearing means 26. To the inner surface of the outer cutter 2. Drive friction wheels 20 pressed against each other
The rotational motion is transmitted to the rotary inner blade 4 by the frictional force generated between the rotary inner blade 4 and the driven friction wheel 27. At this time, the driven inner friction wheel 27 on the horizontal shaft 10 is supported between the driving friction wheel 20 and the idle friction wheel 22 even when the rotary inner blade 4 has no center where the horizontal shaft 10 is not supported by the bearing. Because it rotates stably. An embodiment of a rotary electric shaver according to the present invention will be described with reference to FIGS. FIG. 2 is a vertical sectional front view of a head portion of a rotary electric shaver. A mesh-shaped outer blade 2 having an arch shape is detachably mounted on an upper portion of a main body case 1 via a holder 3. Have been. A cylindrical rotary inner blade 4 that slides and rotates on the inner surface of the outer blade 2, a drive motor 5, and a drive transmission mechanism 6 that transmits the output of the drive motor 5 to the rotary inner blade 4 are incorporated in the main body case 1. . The rotary inner blade 4 is formed in a cylindrical shape, has a plurality of spiral cutting blades 8 on the peripheral surface thereof, and has horizontal shafts 9 and 10 integrally projecting from the centers of both left and right end surfaces. As shown in FIG. 1, the outer cutter 2 is held on a holder 3 by a spring member 7 in a state where both ends or one end thereof are pulled and urged so as to wind the rotary inner cutter 4. In FIG. 2, the drive motor 5 is held and fixed inside the main body case 1. The drive transmission mechanism 6 fixes an output gear 12 to a shaft 11 of the drive motor 5, arranges a sun gear shaft 13 in parallel above the shaft 11, and connects a sun gear 14 and the output gear 12 fixed to the shaft 13. Power is transmitted through the intermediate gear 15. Note that the output gear 12 and the sun gear 14 can be belt-driven by a timing belt. A planetary gear shaft 16 is arranged above the sun gear shaft 13 in parallel with the sun gear shaft 13, and a planetary gear 17 meshing with the sun gear 14 is fixed to the planetary gear shaft 16. The sun gear shaft 13 and the planetary gear shaft 16 are connected by an arm 19.
Therefore, the planetary gear 17 rotates around the sun gear 14 by a predetermined angle while meshing with the sun gear 14. A driving friction wheel 20 made of a material having a large friction coefficient such as rubber is fixed on the planetary gear shaft 16 side by side with the planetary gear 17. In FIG. 1, an idle friction wheel 22 made of a material having a large friction coefficient, such as rubber, is used as a driving friction wheel 20 for an idle friction wheel 21 arranged in parallel with the planetary gear shaft 16.
Disposing near contact. As shown in FIG. 3, arc-shaped grooves 23 drawn around the sun gear shaft 13 on the inner wall of the main body case 1.
Are provided opposite to each other, and the idle friction axle 2 is
By supporting both ends of the roller 1, the idle friction wheel 22 is movable around the sun gear shaft 13. The planetary gear shaft 16 and the idling friction axle 21 are always drawn together by a tension spring member 24. As shown in FIGS. 2 and 4, on the opposite side of the main body case 1 from the drive transmission mechanism 6, a bearing means is formed having a U-shaped groove 25 made of an elastic material such as a leaf spring. 26 are arranged. The bearing means 26 is appropriately elastically deformed in the vertical direction. Thus, as shown in FIG. 2, the rotary inner blade 4 has the horizontal shaft 9 at one end thereof mounted on the U-shaped groove 25 of the bearing means 26 and has a large coefficient of friction on the horizontal shaft 10 at the other end. A driven friction wheel 27 made of a material such as rubber is fixed, and the driven friction wheel 27 is placed between the driving friction wheel 20 and the idle friction wheel 22 to be horizontally supported on the main body case 1. At this time, the driving friction wheel 20 and the idle friction wheel 22 are attracted to each other by a tension spring member 24, and the bearing means 26 is elastically movable in the vertical direction.
The rotating inner blade 4 is supported by the elastic force of the bearing 4 and the bearing means 26 so as to be able to float vertically. When the outer cutter 2 is attached, the rotary inner cutter 4 is pushed upward by the pushing action of the spring member 24 and the bearing means 26 to be urged upward, and the driven friction wheel 27 is driven by the driving friction wheel 20 and the idle friction wheel 22. While pressing, it comes into close contact with the inner surface of the outer cutter 2. At this time, the rotation of the drive motor 5 is transmitted from the output gear 12 through the intermediate gear 15 to the sun gear 14 at a reduced speed, and the planetary gear 17 meshing with the sun gear 14 and the driving friction wheel 20 rotate together. The driving friction wheel 20 and the idle friction wheel 22 and the driven friction wheel 27 are brought into contact with each other and pressed by the spring member 24, and the rotational motion is transmitted to the rotary inner blade 4 by a frictional force generated therebetween. At this time, when the outer blade 2 receives skin pressure, the rotating inner blade 4 descends against the pushing action of the spring member 24 and the bearing means 26 as shown in FIG. Moves the driving friction wheel 20 and the idle friction wheel 22 down simultaneously to the center of the sun gear shaft 13, respectively, but the planetary gear 17 rotates around the sun gear 14 while meshing with the sun gear 14. The rotation of the rotary inner blade 4 can be maintained. When the skin pressure on the outer cutter 2 is released, the rotating inner cutter 4 is pushed up as it is while being in close contact with the inner surface of the outer cutter 2 by the elastic restoring force of the spring member 24 and the bearing means 26. In the above embodiment, the idle friction axle 21 is movably supported by the arc-shaped groove 23. Instead, as shown in FIG. Can be connected by an arm 29. Further, as shown in FIGS. 6 and 7, the bearing means 26 may always be pushed up and urged by a separate spring member 30.
In this case, instead of the bearing means 26 having the U-shaped groove 25, for example, it is constituted by a pair of adjacent rollers (not shown). Alternatively, the horizontal shaft 9 may be supported on both rollers. Further, the driving / driven friction wheels 20 and 27 are provided with V-shaped grooves 31 on the peripheral surface of the driving / driven friction wheels 20 and 27 as shown in FIG. 20 and V-shaped groove 31 and V-shaped groove 3 of driven friction wheel 27
If the projections 32 on both sides of the 1 are fitted in a wedge shape, they engage with each other, so that even if the pressing force is the same, the direct pressure at the pitch point increases and the frictional force increases, as compared with the cylindrical friction wheel. , Get large transmission torque. Also, as shown in FIG.
May be inclined toward the outer circumference so that the driving friction wheel 20 slides in the axial direction along the feather key 33 on the planetary gear shaft 16, and the friction force is increased by the spring 34. According to this, the driving friction wheel 20 tends to spread left and right by the component force of the centrifugal force during rotation.
4 is compressed and the direct pressure at the contact point sequentially increases, and the transmission torque also increases. As described above, according to the present invention, the rotary inner blade 4 has the horizontal axis 9 at one end on the bearing means 26 which can be vertically elastically displaced, and the horizontal axis 10 on the other end. It is only necessary to place the driven friction wheel 27 between the driving friction wheel 20 and the idle friction wheel 22. Therefore, the above-described conventional rotary inner blade is inserted and removed in the axial direction, and the hand is injured by the rotary inner blade. It can be safely attached and detached without fear of doing so. Moreover, the rotating inner blade 4 can be operated by one hand without using a tool or both hands.
Can be easily attached and detached, and its cleaning and replacement can be performed easily and quickly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a head unit. FIG. 2 is a vertical sectional front view of a head unit. FIG. 3 is a vertical sectional front view showing a support structure of the idle friction wheel. FIG. 4 is a side view of bearing means for supporting a horizontal axis at one end of the rotary inner blade. FIG. 5 is a side view of a head section showing another embodiment. FIG. 6 is a longitudinal sectional side view of a bearing portion showing another embodiment. FIG. 7 is a longitudinal sectional side view of a bearing section showing still another embodiment. FIG. 8 is a front view of a driving / driven friction wheel showing still another embodiment. FIG. 9 is a longitudinal sectional front view of a driving / driven friction wheel showing still another embodiment. [Description of Signs] 1 Body case 2 Outer blade 3 Holder 4 Rotating inner blade 5 Drive motor 6 Drive transmission mechanism 9 ・ 10 Horizontal axis 13 Sun gear shaft 14 Sun gear 16 Planet gear shaft 17 Planet gear 19 Arm 20 Driving friction wheel 21 Idling friction axle 22 Idling friction wheel 24 Spring member 26 Bearing means 27 Driven friction wheel

Claims (1)

(57) on top of the Claims 1 main body case (1), mesh outer cutter curved in an arch shape (2) is detachably mounted via a holder (3) A cylindrical rotary inner blade (4) that rotates while sliding on the inner surface of the outer blade (2); and a drive motor (5).
When a driving dynamic motor power transmission mechanism for transmitting the rotating inner blade (4) output (5) (6) assembled in the main body case (1) Included
The rotating inner blade (4) has a cutting edge on the cylindrical peripheral surface.
(8), and are integrally protruded from the center of each of the left and right end faces.
With horizontal axes (9) and (10), and the rotating inner blade (4) is horizontal.
In a rotary electric shaver that rotates around the shafts (9) and (10), the horizontal shaft (9) at one end of the rotating inner blade (4) is moved up and down at a predetermined position on the main body case (1). placed on the elastic displacement freely bearing means (26), and fixing the driven friction wheel (27) on the horizontal axis of the other end of the rotary inner blade (4) (10), the drive transmission mechanism (6) Has a sun gear (14) that is rotationally driven by a drive motor (5), meshes a planetary gear (17) with the sun gear (14), and rotates a sun gear shaft (1).
3) and a planetary gear shaft (16) are connected by an arm (19), and a driving friction wheel (20) is fixed on the planetary gear shaft (16), and is arranged in parallel with the planetary gear shaft (16). Idler friction axle (2
1) A free running friction wheel (22) is fixed on the upper side so as to be close to the driving friction wheel (20), and the free running friction wheel (22) is movable around the sun gear shaft (13). The driving friction wheel (20) and the idle friction wheel (22) are attracted to each other by a spring member (24), and the driven friction wheel (27) is the driving friction wheel (20) and the idle friction wheel (22). A rotary electric razor, which is placed between the electric razors.