JPS628859Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is based on the blade structure of an electric shaver, particularly an attachment-type blade unit drive structure in which the rotary blade unit and the comb blade unit are replaceably attached to the main body case. Involved.

A conventional rotary blade type blade has a structure shown in the sectional view of FIG. Reference numeral 16 denotes a motor joint made of a metal member, which includes a trimmer drive shaft 19 that drives the movable blade of the comb blade unit (see Fig. 4), an inner blade drive shaft 31 that drives the inner blade 8 of the rotary blade unit. By sharing the rotary blade unit 1 and replacing the rotary blade unit 1, both can be driven. 5 is the inner blade support, and the lower part is a D-cut hole (A-A in Fig. 1).
(See Figure 2 for a sectional view). The motor joint 16 fits into the inner cutter support 5 and drives the inner cutter 8. The inner cutter drive shaft 31 is cut into a track shape. Furthermore, the center of the trimmer drive shaft 19 does not coincide with the center of the inner cutter drive shaft 31 in order to cause the movable blade of the comb blade unit to reciprocate and is eccentric, so the comb blade movable portion shown in FIG. This allows the blade 26 to be driven. In the rotary blade unit 1, if the outer cutter 3 is removed for safety reasons, the inner cutter 8
It has a structure that comes off along with the main body case 1.
When setting the rotary blade unit 1 to 1,
It is not always possible to set the D-cut portion of the inner blade support 5 and the track-shaped cut portion of the motor joint 16 in a state where they are properly aligned, and the inner blade drive shaft 3 cut into the track-shape of the motor joint 16 cannot be set.
In some cases, the bottom surface 33 of the inner cutter support 5 is set on the top surface 32 of the inner cutter support 5. In this case, there is a risk of damaging the inner cutter 8, so the inner cutter support 5
The fitting amount B between the bottom surface 33 of the motor joint 16 and the top surface 32 of the inner cutter drive shaft 31 of the motor joint 16 must be set smaller than the sinking amount C of the inner cutter body 4.

The purpose of this invention is to eliminate the above-mentioned problems, and when the rotary blade unit and comb blade unit are replaced and installed in the main body case, the motor joint smoothly attaches to the inner blade support. This prevents horizontal damage to the inner cutter, etc., and also prevents fluctuations in the pressure force between the inner cutter and the outer cutter, thereby maintaining good sharpness.

The gist of the present invention consists of a main body case, an outer cutter that is detachably attached to the main case and has an outer cutter body, and an inner cutter that has an inner cutter support that has an inner cutter body that slides on the inner surface of the outer cutter body. A rotary blade blade unit consisting of a comb blade case that is detachably attached to the main body case, a fixed blade that is fixed to the comb blade case, a movable blade that is crimped to the fixed blade, and a movable blade drive that drives the movable blade. a large-diameter comb blade unit that is inserted into a substantially conical hole provided at the lower center of the inner blade support when the rotary blade blade unit is attached to the main body case; a small-diameter trimmer drive that is inserted into the trimmer drive bearing portion of the movable blade drive body and protrudes from the upper surface of the substantially conical portion when the comb blade unit is attached to the main body case. a shaft and a motor joint that is attached to the drive shaft of a motor built into the main body case,
The substantially conical portion of the motor joint is formed such that the center of the small diameter top surface is eccentric with respect to the center of the large diameter bottom surface, and the slope angle of the slope portion connecting the bottom surface and the top surface is continuously variable; The electric shaver is characterized in that the trimmer drive shaft is formed to protrude from the upper surface of the substantially truncated conical portion.

The present invention will be explained in detail based on the drawings.

3, 4, and 5 show embodiments of the present invention, and FIG. 3 is a sectional view of the blade unit in which the blade unit is a rotary blade type. FIG. 4 shows a cross-sectional view of the blade unit in which the blade unit is a comb blade type. FIG. 5 shows a perspective view a and a plan view b of the motor joint. FIG. 3 shows the state in which the rotary blade unit 21 is set, and in FIG. The outer cutter body 1 is integrally insert-molded with an outer cutter frame 2 made of plastic. The outer cutter 3 is composed of an outer cutter body 1 and an outer cutter frame 2. A plurality of inner cutter bodies 4 are disposed on the inner surface of the outer cutter body 1 so as to be able to press and slide freely, and are biased and locked to an inner cutter support 5 by an inner cutter spring 6 so as to be movable up and down. Reference numeral 7 denotes an inner blade adjustment screw used to adjust the height of the inner blade 4 and vary the contact pressure of the inner blade 4 with respect to the outer blade 1 to ensure an appropriate current value and sharpness. The inner cutter 8 is composed of an inner cutter body 4, an inner cutter support 5, an inner cutter spring 6, and an inner cutter adjustment screw 7. Reference numeral 9 denotes an inner cutter support ring made of synthetic resin, and the inner cutter support ring 9 is fixed to the groove 10 of the outer cutter frame 2 by a bayonet type. Furthermore, the inner cutter support ring 9 can be freely removed from the outer cutter frame 2. A projection 12 is disposed above the main body case 11, and the projection 12 is fixed to a groove 13 of the outer cutter frame 2 by a bayonet. Like the inner cutter support ring 9, the outer cutter 3 can be attached to and removed from the main body case 11 using a bayonet. A motor 14 is fixed to the main body case 11 by screws or the like. A motor joint 16 is press-fitted into the drive shaft 15 of the motor 14. The motor joint 16 is made of a metal member, and has a cylindrical part 17 into which the drive shaft 15 of the motor 14 is press-fitted, as shown in FIGS. A substantially conical portion 18 is provided, which is formed by eccentrically centering the center of the large diameter and the center of the small diameter of the top surface, and continuously varying the slope angle of the slope portion connecting the bottom surface and the top surface. A trimmer drive shaft 19 for driving a comb-shaped movable blade 26 shown in FIG. 4 is disposed above the top surface. In addition, the inner cutter support 5 has a substantially conical portion 1 of the motor joint 16.
A substantially conical hole 20 is provided so as to fit with the hole 8 . When the motor joint 16 and the inner blade support 5 are fitted together, the motor joint 1
The tip of the trimmer drive shaft 19 of No. 6 fits smoothly into the substantially conical hole 20 of the inner cutter support 5 along the slope of the substantially conical hole 20. Once seated, the motor joint 16 and the inner cutter support 5 engage, and the rotation of the motor 14 is reliably transmitted to the inner cutter 8. Further, even when the outer cutter 3 is set in the main body case 11, no matter where it is set, the inner cutter will not be damaged because the rotation of the motor will ensure that the outer cutter 3 is set at a fixed position.

FIG. 4 shows a sectional view of the blade when the rotary blade unit 21 is replaced with a comb blade unit 22.
Reference numeral 23 denotes a comb blade case, and a groove 13 is provided in the comb blade case 23 so that the comb blade case 23 can be fixed with a bayonet. The comb blade case 23 is removably attached to the main body case 11. 24 is a trimmer board that fixes a comb-shaped fixed blade 25, and the fixed blade 2 is fixed by thermal caulking or the like.
Fix 5. 26 is a movable blade that slides into pressure contact with the fixed blade 25, and a movable blade drive body 27 that drives the movable blade 26 is disposed below the movable blade 26. Further, below the movable blade drive body 27 is a trimmer drive bearing portion 28 that fits into the trimmer drive shaft 19.
is provided. 29 is a trimmer spring for pressing the movable blade 26 against the fixed blade 25. 30 is a fixing plate that fixes the fixed blade 25. The comb blade unit 22 includes a comb blade case 23, a trimmer board 24,
It is composed of a fixed blade 25, a movable blade 26, a movable blade driver 27, a trimmer spring 29, and a fixed plate 30.

As described above, according to the present invention, the motor joint includes a substantially conical part that is inserted into the hole of the inner cutter support and rotates the inner cutter support, and a substantially conical part that is inserted into the trimmer drive bearing to drive the movable blade back and forth. Since the rotary trimmer drive shaft is provided, when the rotary blade unit and the comb blade unit are interchangeably mounted on the main body case, each blade unit can be driven. In this case, the substantially conical portion of the motor joint is formed such that the center of the top surface of the small diameter is eccentric with respect to the center of the bottom surface of the large diameter, so that the substantially conical portion is inserted into the hole of the inner blade support. In this case, since both of them do not slip in the rotational direction, the inner cutter support is rotationally driven. Moreover,
Since this substantially conical portion is formed by continuously changing the slope angle of the sloped portion connecting the bottom surface and the top surface, a substantially conical hole in the inner cutter support that fits into this substantially conical portion is formed. The mating between the two is effortless over the entire circumference, and the driving force of the motor joint can be reliably transmitted, and there is no local contact between the mating surfaces of the two, which prevents damage to the strength such as unevenness. Furthermore, since there is no play between the two when they fit together, no noise is generated.

In addition, when the rotary blade blade unit is bonded to the main body case, the motor joint and the hole of the inner blade support are fitted very smoothly.
That is, the small-diameter trimmer drive shaft formed on the tip side of the motor joint is first inserted into the hole of the inner blade support with a margin, and then the substantially conical portion has a small diameter on the top side and a large diameter on the bottom side. Since it has a substantially conical shape, even if the eccentric direction of the substantially conical part and the eccentric direction of the hole of the inner cutter support do not match, the hole of the inner cutter support will not follow the slope of the substantially conical part. It is inserted gradually, and in the end it is inserted smoothly. Therefore, the motor joint never pushes up the bottom of the inner cutter support as shown in Figure 1, so there is no damage to the inner cutter, outer cutter, etc.
Also, there is no change in the pressure contact between the inner cutter and outer cutter.
It can maintain extremely good sharpness over a long period of time.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the blade of a conventional rotary blade type.
FIG. 2 is a sectional view taken along line A-A in FIG. 1. Fig. 3 is a sectional view of the rotary blade type blade of the embodiment of the present invention, Fig. 4 is a sectional view of the comb blade type blade, and Fig. 5 is a plan view b and a perspective view a of the motor joint. . Inner blade support...5, Inner blade...8, Main body case...
...11, Motor joint...16, Almost conical part...18, Trimmer drive part...19, Rotary blade block...21, Movable blade...26, Comb blade block...22, Movable blade Driving body...27, substantially conical hole...20.

Claims (1)

[Scope of utility model registration request] A rotary blade blade section consisting of a main body case, an outer cutter that is detachably attached to the main case and has an outer cutter body, and an inner cutter that has an inner cutter support that has an inner cutter body that makes sliding contact with the inner surface of the outer cutter body. A comb blade consisting of a unit, a comb blade case that is detachably attached to the main body case, a fixed blade that is fixed to the comb blade case, a movable blade that is crimped to the fixed blade, and a movable blade driver that drives the movable blade. a blade unit, a large-diameter approximately conical portion inserted into a generally conical hole provided at the lower center of the inner blade support when the rotary blade blade unit is attached to the main body case; When the comb blade unit is attached to the main body case, the main body has a small diameter trimmer drive shaft that is inserted into the trimmer drive bearing of the movable blade drive body and protrudes from the upper surface of the substantially conical part. a motor joint that is attached to a drive shaft of a motor built into the case, and the substantially conical portion of the motor joint has a center of a top surface of a small diameter eccentric with respect to a center of a bottom surface of a large diameter. An electric shaver characterized in that the slope angle of the slope portion connecting the bottom surface and the top surface is continuously variable, and the trimmer drive shaft is formed to protrude above the top surface of the substantially conical portion.