JPS5926952Y2 - Electric razor trimmer drive device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a trimmer drive device for an electric shaver.

An electric shaver using a trimmer drive device, which is the basis of this invention, is shown in FIGS. 1 to 29.

This configuration will be explained as follows. That is,
In FIGS. 1 to 5, a housing 1 constituting a razor main body is formed of fitting bodies 1a and 1b forming a front side and a rear side, respectively, and an engaging part 2 of a joint part 1c of the housing 1.
and are integrated with a connecting screw 3.

Its overall shape is approximately a rectangular cylinder, with the head 4 of the structure 1a protruding in a cylindrical shape, and the head 5 of the structure 1b having a slightly narrow width.
It protrudes at a slope from the center of the.

Each of the constituent bodies 1a and 1b is molded using a metal mold, and at least the constituent body 1b is made of a flexible resin material.

As shown in FIGS. 4, 5, and 8, the motor 6 is held by a holding frame 7 and mounted inside the heads 4 and 5 of the housing 10. As shown in FIGS.

As shown in FIG. 7, an eccentric cam 9 is attached to the motor shaft 8 protruding from the holding frame 7, and the eccentric cam 9 is integrally formed with a clutch pawl 9a facing in the axial direction and a multistage shaft 9b.

A rotary driver 10 coupled to the inner cutter frame is rotatably inserted onto the multistage shaft 9b of the eccentric cam 9, and a joint bushing 11 is fitted onto the tip of the multistage shaft 9b.
A clutch coil spring 12 is interposed between the joint bush 11 and the rotary drive element 10, and the rotary drive element 10 is engaged with the clutch pawl 9a of the eccentric cam 9 due to the spring pressure.

Further, the rotary driver 10 has a pawl (
It consists of a disc 10a with a circular plate (not shown) and a rotation transmitting part 10b with unevenness in the circumferential direction.

On the other hand, as shown in FIG. 8, the swinging center of the drive rod 14 formed in a potbell shape 13 is pivotally connected to the drive rod frame 16 with a pin 15, and the eccentric cam 9 is passed through the potbell shape 13 of the drive rod 14. 16 is slidably placed on the holding frame γ.

The drive rod frame 16 has a pair of guide holes 17, and a pair of protrusions 18 protruding from the holding frame 7 are passed through the guide holes 17 to guide the slide of the frame 16, and the holding frame 7
A pivoting portion of the frame 16 is supported by a pin 19 protruding from the frame 16.

Further, a clutch-off taper protrusion 20 on which the disc 10a of the rotary driver 100 rides is formed on the edge of the rotary driver insertion hole 16a of the frame 16.
Slide drive pins 21 are provided protruding from both sides of the.

A substantially U-shaped trimmer lever 2 is attached to this slide drive pin 21.
The holding frame 7
the trimmer lever 2.
The intermediate portion 25 of the motor 6 is located at the rear surface of the motor 6.

Further, the holding frame 7 swingably supports a trimmer joint 27 with a pin 28 on the side surface facing the transmission ball (driver) 260 of the drive rod 14 in the sliding direction of the frame 16, and has fork joints 27at on both ends thereof. 27b and engages with the transmission ball 26 of the drive rod 14 at the fork joint 27a.

As shown in FIGS. 1 to 5, the head 4 of the structure 1a
A blade mount 29 forming a beard debris storage portion is fitted into the opening with claws 30 and fixed with a mounting screw 31, and the rotary driver 10 faces the center hole 29a.

A shaft portion of an inner cutter frame 32 (FIG. 4) is fitted into this rotary driver 10 so as to be slidable in the axial direction.

Further, a threaded groove 29b is formed on the inner peripheral surface of the blade mount 29, into which the outer cutter frame 33 is screwed, and thereby the outer cutter 34 and the inner cutter (not shown) are engaged with each other.

The outer cutter 34 forms an annular whisker guide groove 35.

Further, a cap 36 is removably fitted into the circumferential groove 33a of the outer cutter frame 33.

As shown in detail in FIGS. 4 and 9, a pair of bosses 37 are provided opposite to each other at the top of the opening of the head 5 of the structure 1b, and the side of the joint 1c of the structure 1b is located at the top of the opening of the head 5 of the structure 1b. By bending the structure 1b by hand 38 as shown in FIG.
Insert.

As shown in detail in FIG. 6, the trimmer blade block 39 has an outer cutter 42 fixed to a trimmer base 41 with a leg 41a having a rotation hole 40, an inner cutter 43 placed on the outer cutter 42, and an inner cutter 43 mounted on the outer cutter 42. 43
The drive element 44 is stopped and integrally supported by holding plates 45 and 46.

Further, as shown in FIG. 9, a recess 47 for accommodating the trimmer blade block 39 is formed at the opening edge of the head 5 of the structure 1b, and the recess 47 is fitted between the legs 41a of the trimmer base 41 in the stored state. A tongue piece 48a is formed to prevent deflection due to impact and fall off from the boss 37, and the trimmer base 4
1 is formed with a protruding piece 48b that closes the gap created at the edge of the opening.

Furthermore, a convex circular arc surface 49 is formed near the boss 37, and a concave circular concave surface 50 is formed on the trimmer base 41 of the trimmer blade block 39, as shown in detail in FIG. .

When the trimmer blade block 39 is in the installed state, the tip 44a of the driver 44 and the other end 27b of the trimmer joint 27 engage with each other as shown in FIG. 4, and when the trimmer blade block 39 is in the stored state, As shown in Fig. 3, the outer cutter 42 and the inner cutter 43
The cutting edge of the back side structure 1b of the no-using 1
When placed on the floor, it is located away from the floor surface 51 to protect the cutting edge.

Further, as shown in detail in FIG. 9, a trimmer bundle 52 is slidably attached to the head 5 of the structure 1b in line with the trimmer blade block 39.

The trimmer handle 52 has claws 53 on both sides that are snap-locked to the inner surface of the opening of the head 5, and an arm 54 extends from the front end and has an operating shaft 55 at its tip for rotating the trimmer base 41. It is rotatably fitted into an operation hole 56 bored close to the hole 40.

A recess 5T is formed on the back surface of the trimmer bundle 52, as shown in detail in FIG.
A protrusion 59 that fits into an engagement hole 58 (FIG. 8) drilled in the intermediate portion 25 of , a support protrusion 60 with a flange, and a rib 61 for temporarily fixing a reversing spring for clicking are protrudingly provided.

On the other hand, a spring locking hole 64 is formed in the concave wall surface 5a of the head 5 and is continuous with a guide elongated hole 62 and a guide hole 63 for guiding the support protrusion 60.

The click reversal spring 56 has a ring 66 bent at one end of a torsion coil spring, and the other end is a shaft 67 bent in the axial direction of the torsion coil spring.

The reversing spring 65 is attached to the ring 66 as shown in FIG.
are fitted with the flange 60a of the flange-equipped support protrusion 60 to prevent them from coming off,
The shaft 67 is spring-locked to the temporary fixing rib 61, and the trimmer bundle 52 is fitted into the concave wall surface 5a of the head 5.

As a result, the shaft 67 that has entered the guide hole 63 can be moved into the structure 1b.
is guided into the locking hole 64 from the inner surface side.

As shown in FIG. 15, the click operation state is such that the trimmer bundle 52 is slid and the position where the shaft 67 of the reversing spring 65 and the ring 66 are lined up perpendicular to the sliding direction A is the reversing position, and the bundle 52 is in the reversing position. is given a click action.

The operations of the trimmer blade block 39 and the razor inner blade described above are as follows: When the trimmer is in the folded down state as shown in FIG. The rotation is transmitted to the rotation driver 10 via the clutch pawl 9a, and the rotation is transmitted to the inner cutter frame 32 via the rotation transmission section 10b.
rotates and the razor is ready for use.

When using the trimmer, pull the trimmer bundle 5 in the direction of arrow A.
2 (at this time, the trimmer bundle 52 clicks), the operating shaft 55 of the arm 54 causes the trimmer blade block 39 to stand up around the boss 37, and the sliding of the trimmer bundle 52 causes the trimmer lever 22 to move through the protrusion 59. swings, the drive rod frame 16 slides on the holding frame 7, and as a result, the edge of the disc 10a of the rotary drive element 10 rides on the clutch-off taper protrusion 20, and the rotary drive element 10 and the eccentric cam 9 The engagement is released, the rotary driver 10 stops rotating, and the inner cutter frame 32 stops operating.

Further, as the drive rod frame 16 slides, the drive rod 14 moves, and the eccentric cam 9 is positioned and engaged with the small diameter portion 13a of the potbelly shape 13, and 90 rotations of the eccentric cam are transmitted to the drive rod 14. The drive rod 14 swings around the pin 15, and the trimmer joint 27 swings, thereby causing the driver 44 of the trimmer blade block 39 to reciprocate, bringing the trimmer into use.

Next, when the trimmer bundle 52 is pulled back, the trimmer blade block 39 falls down around the boss 37, and the drive rod frame 1
6 slides, the engagement between the eccentric cam 9 and the drive rod 14 is released, and the eccentric cam 9 and the rotary driver 10 are brought into engagement, and as long as the motor 6 is driven, the trimano handle 5
The operation 2 switches between the razor and the trimmer.

As shown in FIGS. 4 and 5, an electric block 68 is attached to the body of the housing 1. As shown in FIGS.

As shown in detail in FIGS. 16 to 19, the electric block 68 has a chassis 69 formed by insert molding sheet metal, to which a battery 70 and a light emitting diode T1 for starting and completing charging are attached, and a fixed contact T2 for a switch is formed. , and electrical connection portions 73 are drawn out at both ends.

On the other hand, circuit components T5 of the charging start/completion circuit including a charging circuit and a buzzer 75a are mounted on a printed circuit board T4 having the same size as the chassis 69, and the chassis 69 and the printed circuit board 74 are connected by a reinforcing member 76. Fixed.

The reinforcing member T6 is made by press-fitting or insert-molding a current-carrying pin 78 into an insulator 77, and uses the current-carrying pin 78 to conduct electrical wiring between the chassis 69 and the printed circuit board 74.

Further, in the circuit components 75..., a heat generating component 75b such as a resistor is supported by the fuse holder T9.

This fuse holder 79 has two cylindrical bodies 80a. 80b are consecutively defeated in parallel, and each cylinder 80a, ao
A slit 81 is formed in b to provide elasticity, a temperature fuse 82 is fitted in one cylinder 80a, and a temperature fuse 82 is fitted in the other cylinder 80b.
The heat generating component 75b is fitted to the chassis 69, and its height is made the same as the height of the insulator 77 of the reinforcing member 76.
It also serves to reinforce the connection between the printed circuit board 74 and the printed circuit board 74.

On the other hand, corresponding to this electric block 68, FIGS.
As shown in the figures and FIG. On 84, small holes 86 for heat dissipation are formed together with small holes 86a for forming the design.

Arrow C is a heat dissipation path of the module within the housing 1.

In addition, a light emitting diode 71 and a fixed contact 7 for the switch
2, a diode insertion hole 87 (FIG. 1) and a switch hole 88 (FIG. 22) are formed on the front side of the housing 1.

The switch for controlling the power on/off of the motor 6 is a switch with a lock button, as shown in detail in FIGS. Movable contact part 90 that can be bent and slid
. . . and a fixed contact 72 formed on the chassis 69.
Put it on top.

A lock button 91 is elastically mounted on the upper surface of the movable contact portion 90.

The lock button 91 has spring legs 92 extending diagonally downward from both sides, and the movable contact portions 90...
Get on top.

Further, both ends 93 of the lock button 910 are tapered in the sliding direction, and the switch hole 88 of the housing 1
The spring leg 92 fits into one 94a of two lock recesses 94at94b arranged side by side inside the hole edge.

The protrusion 95 formed between the lock recesses 94 a and 94 b extends from the recess 94 b of the lock button 91 to the recess 94 .
A taper 96 is formed to enable automatic movement to a.

An insertion hole 98 is formed in the center of the switch base 97, through which the button part 91a of the lock button 91 is inserted, and arms 99 are extended from both sides of the switch base 970, and a connecting protrusion 10 is formed at the tip.
0, and the connecting protrusion 100 is inserted into a connecting hole 101 bored in the base 89a of the switch spring 890 and connected by heat sealing.

The switch base 97 also has a click spring 102 at one end.
A projection 103 having an arcuate surface is formed at both ends of the click spring 1020, and a guide projection 97a is formed at the other end of the switch base 97.

On the other hand, a pair of click protrusions 104 are formed inside the switch hole 88 of the housing 1, facing the click spring 102, as shown in FIG.

This click protrusion 104 has a triangular shape with an apex, and the protrusion 103 of the click spring 102 slides on the click protrusion 104 so that the inclination angle θ2 of the upward slope 104a is larger than the inclination angle θ1 of the downward slope 104b (that is, θ1
θ2) to make the upward slope gentle.

Further, the switch base 97 has a pair of holes 105 on the upper surface, and the engaging protrusion 10 of the switch handle 106 is inserted into the hole 105.
7 is removably press-fitted.

The switch bundle 106 is hook-shaped as shown in FIG. 1, and has snap claws 108 on both sides of the hook, and has snap claws 108 attached to one side of the switch hole 88 as shown in FIG. 22. and the claw insertion hole 109 provided in parallel with the switch hole 88, and the hole 106 in the center.
a, through which the button portion 91a of the lock button 91 is inserted.

To turn on this switch with a lock button, the button portion 91a of the lock button 91 protruding from the switch bundle 106 is pushed in and slid in the horizontal direction.

That is, when the button part 91& is pushed in, both ends 93 of the lock button 910 are separated from the lock recess 94a.
The switch handle 106 can now be slid.

As a result, the switch spring 89 is
slides on the fixed contact 72, a contact closing operation is performed, and the drive circuit of the motor 6 is closed.

The contact pressure is provided by the spring force of the switch spring 89 and the spring force of the spring leg 92 of the lock button 91.

Also, by moving the switch base 97, the click spring 1
02 climbs over the click protrusion 104, a click action occurs.

In this case, since the click protrusion 104 has different inclination angles θ□ and θ2, it exhibits a click curve as shown in FIG. 26, and the sliding operation is performed smoothly.

That is, figure a shows a click curve that occurs at the front end of the click spring 102, and the reason why the upward curve is not a straight line (imaginary line) but a convex curve is because the protrusion 103 is twisted due to contact friction. be.

The figure shows a click curve generated at the rear end of the click spring 102, and the figure C shows the sum of the click curves.

Note that the horizontal axis represents the slide stroke X, and the vertical axis represents the force F applied to the switch base 97 as resistance.

-4. The switch with a lock button can be turned off by simply pulling back the switch bundle 106 without pressing the lock button 91.

That is, when the switch bundle 106 is pulled back, both ends 93 of the lock button 910, which are spring-engaged with the lock recess 94b of the switch hole 88,
3a, the taper 96 of the protrusion 95 slides without resistance, comes out of the lock recess 94b, and automatically moves to the lock recess 94a.

At this time, the click action by the click spring 102 and the click protrusion 104 is the same as that at the time of the on operation.

In this way, the switch spring 89 separates from the fixed contact 72 and opens the drive circuit of the motor 6.

As shown in detail in FIG. 28, a charging plug base 110 is electrically connected and attached to the rear end of the electric block 68.

For its installation, the bottom of the plug base 110 is connected to the electric block 68.
It is placed horizontally so that the width and height match the rear end surface of the
The plug base 110 is configured so that the plug blade 111 can move forward and backward toward the side of the nozzle 1 as shown in FIG.

That is, in the plug base 110, the guide walls 113 rise from both sides of the bottom wall 112, and the contact springs 1 are placed on the bottom wall 112.
14 and a protrusion 115 for the plug blade slide are formed (・ru(
17, 18).

Of the contact springs 114, two contact springs 114a located within two protrusions 115 are connected to four electrical connection parts 7302 drawn out from the electric block 68, and are connected to one part of the drive circuit of the motor 6. contact spring 114
The remainder (ie 114b) is connected to electrical connection '173b to form part of the charging circuit.

Further, the plug base 110 has a plug temporary fixing hook 116 erected at the rear end, and a front wall 1 for forming a plug blade insertion hole at the front end.
17 is erected, and plug temporary fixing protrusions 11 are provided at both ends of the upper part.
8 is provided.

The plug 119 has a pair of plug blades 111 integrated into a holder 120, and a bundle 121 protruding from the upper surface of the holder 120.
A shorting fitting 122 (FIG. 5) is attached to the lower surface of the bundle 121, and the blades 111 of this plug 119 are guided from the inside to both ends of the front wall 117, and the lower surface of the plug blades 111 is guided by the protrusion 115. It is positioned between the wall 113 and the temporary fixing protrusion 118 .

Further, the rear end portion of the holder 120 is engaged with the temporary fixing hook 116 to create a temporarily fixed state as shown in FIG. 2T.

On the other hand, a second
8 As shown in Fig. 8, cutouts 1 are made in the components 1a and Ib of the housing 1.
23. By forming a recess 124 and a slit forming notch 125, fitting the plug 119 temporarily into the plug base 110 into the structure Iatlb, and joining the structures 1a and 1b, as shown in FIG. The front wall 117 of the plug base 110 fits into the hole formed by the notch 123 to form an insertion hole 126 for advancing and retracting the plug, and the leg 12 of the bundle 121 fits into the hole formed by the slit forming notch 125.
1a is inserted, and the bundle 121 is positioned within the recess 124.

Plug operation is performed when charging is used, and the
2 to cause the plug blade 111 to protrude from the insertion hole 126 for advancing and retracting the plug as shown in FIG.

Then, by inserting the plug blade 111 into an outlet (not shown), power is supplied to the battery 70 via the plug blade 111, the contact spring 114b, and the electrical connection portion 73b.

In addition, by sliding the bundle 121 and moving the plug 119, the shorting fitting 122 is connected to the contact spring 114a.
The battery is separated from the battery and rests on the insulating part 112a, thereby opening the motor drive circuit and preventing the motor 6 from operating during charging even if the switch bundle 106 is turned on.

The trimmer drive device in the electric shaver as described above is
Basically, as explained in FIGS. 4 and 8,
It is composed of a motor shaft 8, an eccentric cam 9, a drive rod 14, a drive rod frame 16, a lever-configured trimmer joint 27, and a trimmer blade block 39. The pivoting portion with the supporting frame T is connected by press-fitting the pins 15 and 28 into the fixed side.

However, when pivoting to the pins 15 and 1B, rattling and vibration in the thrust direction cannot be completely prevented even if dimensional tolerances are strictly controlled, resulting in noise and irregular friction.

Therefore, an object of this invention is to provide a trimmer drive device for an electric shaver that further reduces noise and irregular friction.

An embodiment of this invention is shown in FIGS. 30 to 34.

That is, this electric shaver trimmer drive device has the following configuration added to the electric shaver trimmer drive device described above.

That is, an elastic body 130, which is a biasing means that comes into elastic contact with the upper surface of the tip end of the drive rod 14, is integrally provided on the side opposite to the drive ring pivot portion of the drive rod frame 16, and is also provided on the motor mounting base I. An elastic body 132 that forms a flat surface 131 and comes into elastic contact with this surface 131 is integrally molded and protrudes from the trimmer joint 27, and furthermore, the pivoting part of the drive rod frame 16 has a bottomed cylindrical shape on the outer surface of the tip. Brim-shaped hook 1
33 is formed by forming a pair of circular arc holes 135 in the drive rod frame 16.
The pivot shaft 134 is connected by two connecting portions 136, and the pivot shaft 134 is tilted in a direction perpendicular to the direction of the swinging force of the drive rod 14 by elastic twisting of the connecting portions 136. Because it was added to
The drive rod 14 swings while being pushed in the thrust direction with a constant load by the elastic body 130, and transmits a stable load amplitude to the trimmer joint 27 without rattling or swinging in the thrust direction.

As a result, regular friction occurs and noise can be reduced, and since the elastic body 130 is integrally formed with the drive rod frame 16, the number of parts does not increase, and the number of assembly steps does not increase.

In addition, the elastic body 132 allows the pin 28 of the trimmer joint 2T to
On the other hand, the side on which the elastic body 132 is located always receives a constant load in the separation direction and transmits a stable amplitude of the load without vibration or rattling in the thrust direction to the driver 44.

As a result, the trimmer joint 27 also has the effect of preventing noise due to its movement.

Furthermore, by integrating the pivot shaft 134 into the drive ring frame 16, the number of parts can be reduced, and since it is a hollow shaft, the drive ring 1
4, the drive ring 14 can be easily assembled by pushing it into the hook 133, and the elastic action in the radial direction allows for tight fitting with the shaft hole of the drive ring 14.

Furthermore, the elastic body 13 is supported by the pivot shaft 134 at two points.
The push against the trimmer joint 27 by the pivot shaft 1
30 is elastically tilted to closely follow the trimmer joint 27, so noise can be prevented in this area.

In addition, since the pivot shaft 130 can be molded without using the side core due to its structure, the mold processing cost is low (0) As mentioned above, the electric shaver trimmer drive device of this invention has a rotary drive shaft and a rotary drive shaft. an eccentric rotation means attached to a rotary drive shaft for orbital movement; and a drive ring having a pivot at one end and a driver at the other end, the intermediate portion of which engages with the eccentric rotation means to perform rocking motion. , a drive ring frame that pivotally connects the pivot portion of the drive ring, and a biasing means that biases the tip of the drive ring in a direction parallel to the pivot axis thereof, so that the thrust direction of the drive ring is reduced. It can prevent rattling and vibration, and it can also prevent noise and irregular friction.

Furthermore, since the eccentric rotation means is engaged between the pivot portion of the drive ring and the drive element, compared to a case where the pivot portion is disposed between the drive element and the engaging portion of the eccentric rotation means, the same eccentric rotation means When used, the amplitude of the drive element can be increased, the total length of the drive ring can be shortened, and the transmission mechanism for obtaining the same amplitude can be made smaller.

Furthermore, by providing an urging means between the eccentric rotation means and the drive element, the swinging of the drive ring is suppressed, and the spring pressure is arranged in the order of the pivot portion, the engaging portion of the eccentric rotation means, and the urging means. The force is always smaller than the rocking force generated by the eccentric rotation means, and since the biasing means is close to the drive element, there is an effect that the amplitude of the eccentric rotation means can be reliably transmitted to the drive element.

[Brief explanation of drawings]

Fig. 1 is a front perspective view of an electric shaver to which the trimmer drive device that is the basis of this invention is applied, Fig. 2 is a rear perspective view of the electric shaver, Fig. 3 is a side view of the electric shaver in a lying position, and Fig. 4 is its cross section. 5 is an exploded perspective view of the trimmer blade block, FIG. 6 is an exploded perspective view of the trimmer blade block, FIG. 7 is an exploded perspective view of the motor shaft connecting member, FIG. 8 is an exploded perspective view of the drive mechanism, and FIG. The figure is an exploded perspective view showing the installed state of the trimmer blade block, Figure 10 is a partial perspective view of the trimmer blade block, Figures 11 and 12 are exploded perspective views showing the assembled state of the trimmer handle, and Figure 13 is an electrical A partial rear view of the razor, FIG. 14 is a cross-sectional view thereof,
Fig. 15 is a sectional view taken along the line W-W, Fig. 16 is an exploded perspective view of the electric block, Fig. 17 is a perspective view of the electric block, Fig. 18 is a front view thereof, Fig. 19 is a right side view thereof, 20th
The figure is an exploded perspective view showing how the nameplate of the electric shaver is installed.
Fig. 21 is an analytical side view, Fig. 22 is a partial perspective view showing the switch hole, Fig. 23 is a sectional view of the switch, Fig. 24 is an exploded perspective view thereof, and Fig. 25 is a switch base. An explanatory diagram of the click operation, Fig. 26 is a click curve diagram, Fig. 27 is a perspective view showing the plug, Fig. 28 is an exploded perspective view thereof, and Fig. 29 is a partial perspective view showing the bottom of the electric razor. , 3rd
Figure 0 is a cross-sectional view of one embodiment of this invention, Figure 31 is a perspective view of its essential parts, Figure 32 is an exploded perspective view thereof, Figure 33 is a partially exploded perspective view thereof, and Figure 34 is a partial perspective view thereof. It is. 8...Motor shaft (rotation drive shaft), 9...
・Eccentric cam (eccentric rotation means), 14... Drive ring, 16... Drive ring frame, 27...
Trimmer joint, 130° 132... Elastic body (biasing means), 133... Hook, 134...
・Pivot axis.

Claims (3)

[Scope of utility model registration request] (1) A rotational drive shaft, an eccentric rotation means attached to the rotation drive shaft for orbital movement, one end of which is pivoted, the other end of which has a driver, and an intermediate portion engages with the eccentric rotation means. A drive rod that performs a swinging motion, a drive rod frame that pivotally connects the pivot portion of the drive rod, and a biasing means that biases the tip of the drive rod in a direction parallel to the pivot axis. Equipped with an electric razor trimmer drive device. (2) One end of the trimmer joint, which becomes a lever, is engaged with the tip of the drive rod, and the inner blade driver is engaged with the other end, and the end of the trimmer joint is also parallel to its pivot axis. A trimmer drive device for an electric shaver according to claim 1, wherein the trimmer drive device for an electric shaver is provided with a biasing means for biasing in a specific direction. (3) The pivoting part for pivotally mounting the drive rod is a flexible hollow shaft with a hook formed at the tip, and the rear end is integrally connected to the drive rod frame at two points, so that the drive rod can be attached to the shaft. The trimmer drive device for an electric shaver according to claim 2, wherein the tip portion is closely engaged with the trimmer joint.