JP4789165B2 - Rotary electric razor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary electric razor provided with an inner blade rotating around a horizontal axis, and more particularly to an electric razor in a form in which motor power is transmitted to an inner blade via a winding transmission.
[0002]
[Prior art]
A rotary electric shaver is known, for example, in Japanese Patent Laid-Open No. 2000-42264. There, the motor power is transmitted to the inner blade via two gear groups. Specifically, the first gear group that rotates about the vertical axis transmits the motor power to one side of the razor head, and the second gear that rotates about the horizontal axis between the final gear and the inner blade of the first gear group. A group is provided.
[0003]
[Problems to be solved by the invention]
As described above, in the power transmission mechanism that transmits the motor power to the inner blade via both the first and second gear groups, the back-crash generated in the meshing portion of each gear, or between the gear and the gear support shaft. The generation of gear noise due to a slight idle gap cannot be avoided. All gears are housed inside the razor head, but the first gear chamber that houses the first gear group and the second gear chamber that houses the second gear group are arranged in an L shape in a state of communicating with each other. It is. Therefore, it is inevitable that gear noise leaks from the second gear chamber to the outside, and gear noise on the first gear chamber side reverberates on the peripheral wall of the second gear chamber, further increasing the sound pressure level of the noise. .
[0004]
The inventors of the present invention are studying to reduce the noise of the rotary electric shaver by reducing the gear noise as described above. Specifically, it is considered to reduce the sound pressure level of gear noise by using a winding transmission mechanism having a timing belt as a transmission element instead of the previous gear group. Incidentally, it is known in Japanese Patent Application Laid-Open Nos. 54-136973, 61-94675, and 61-52891 that motor power is transmitted to the inner blade via a winding transmission mechanism. In both cases, the motor central axis is arranged in parallel with the inner cutter central axis, pulleys are fixed to the motor output shaft and the inner cutter shaft, and belts are wound around these pulleys.
[0005]
In the transmission structure that transmits the motor power to the inner blade only through the winding transmission mechanism as described above, the transmission noise due to the gear can be reduced, but the motor speed is likely to fluctuate greatly due to slight load fluctuations during shaving. The beard cutting cannot be performed in a stable state. Using a high-torque, high-power motor can suppress fluctuations in the rotational speed to some extent, but is expensive. Also, during high-load operation such as when shaving long hair or stiff beard, even if a high-performance motor as described above is used, it is inevitable that the motor rotation speed will drop sharply and the sharpness will drop. It is difficult to use for practical use.
[0006]
The object of the present invention is to transmit the motor power to the inner blade by using both the gear transmission mechanism and the winding transmission mechanism, thereby realizing a low noise of the power transmission mechanism and the motor rotation accompanying the load fluctuation during shaving. The object is to provide a rotary electric shaver that suppresses large fluctuations in the number and can always shave in a stable state. The object of the present invention is to reduce the fluctuation range of the motor rotation speed even during high-load operation represented by shave with long hair or stiff beard, and thus stable shaving without the need to use a motor with high torque and high output. The purpose of this is to provide a rotary electric shaver that can be used.
[0007]
[Means for Solving the Problems]
The electric razor of the present invention has an inner blade 9 that is driven to rotate about a horizontal axis in the razor head 2 at the upper part of the main body case 1, and a first transmission chamber 27 at the lower part of the razor head 2 as shown in FIG. And a second transmission chamber 28 is defined on one side of the razor head 2, and the motor power is accommodated in the gear group accommodated in the first transmission chamber 27, and then in the second transmission chamber 28. It is transmitted to the inner blade 9 via the wound transmission mechanism H. The first transmission chamber 27 and the second transmission chamber 28 are separated in a sealed manner by a partition wall 29 provided between the chambers 27 and 28. An intermediate shaft 44 for transmitting the power of the gear group G to the winding transmission mechanism H is provided on the partition wall 29. The interior of the first transmission chamber 27 is divided into two by a sound insulation wall 65. A gear group G is accommodated in the gear chamber 66 between the sound insulating wall 65 and the partition wall 29.
[0008]
The gear group G is configured as a reduction gear mechanism that reduces the motor power and transmits it to the winding transmission mechanism H. Specifically, as shown in FIG. 6, the gear group G is provided between a plurality of spur gears G1 to G4 that decelerate motor power, a final gear G4 of the gear group G, and the intermediate shaft 44. It comprises a pair of turning gears 45 and 46 for converting the rotational power of the final gear G4 into rotational power around the intermediate shaft 44. One of the spur gears G1 to G4 is provided with rotational drive bodies 47 and 48 for branching power for driving the blade bodies 7 and 11 different from the inner blade 9 (see FIG. 1).
[0009]
The first transmission chamber 27 is partitioned by a motor base 22 on which the motor 17 is mounted on the lower surface side and a head frame 23 fixed on the upper surface of the motor base 22. The second transmission chamber 28 is defined by a partition wall 29 of the motor base 22 and a side wall 33 of the head frame 23, and a cover 34 that covers the outer surfaces of the partition wall 29 and the side wall 33.
[0010]
As shown in FIG. 9, at least the front and rear peripheral surfaces of the first transmission chamber 27 are covered with peripheral walls 22 a and 23 a that overlap the inner and outer multiples.
[0012]
The sound insulation wall 65 is formed so as to face the partition wall 29 along the outline of the gear group G.
[0013]
As shown in FIG. 7, the winding transmission mechanism H is wound around and attached to a driving pulley 52 fixed to the intermediate shaft 44, a driven pulley 53 disposed at the upper end of the second transmission chamber 28, and both pulleys 52 and 53. A timing belt 55 and a tension mechanism 56 disposed outside the slack side transition locus of the timing belt 55 are included.
[0014]
[Effects of the invention]
In the present invention, since a power transmission structure for transmitting the motor power to the inner blade 9 via the gear group G and the winding transmission mechanism H is adopted, the motor power is transmitted to the inner blade by both the first and second gear groups. Compared with the electric razor, the sound pressure level of the gear noise can be reduced by the amount using the winding transmission mechanism H. Furthermore, since the gear group G is arranged in the first transmission chamber 27 below the razor head 2 where noise is difficult to leak, both the first and second transmission chambers 27 and 28 are divided in a sealed manner by the partition wall 29. The gear noise can be prevented from propagating to the second transmission chamber 28, and the noise reduction of the rotary electric shaver can be realized in combination with the decrease in the sound pressure level.
[0015]
Since the motor power is transmitted to the inner blade 9 through the gear group G and the winding transmission mechanism H, the gear group G can absorb the rotational reaction force that is transmitted from the inner blade 9 side to the motor side when the load fluctuates. Compared to the conventional transmission structure that transmits the motor power to the inner blade only by the winding transmission mechanism, the fluctuation range of the motor rotation speed accompanying the load fluctuation can be reduced. In particular, when the gear group G is configured as a reduction gear mechanism, the rotational reaction force is effectively absorbed by the gear group G, and the rotational fluctuation of the motor 17 can be suppressed, and a high torque and high power can be used as a power source. It is advantageous in that it is not necessary to use an output motor, the manufacturing cost of the electric razor can be reduced, and the degree of battery consumption can be reduced.
[0016]
When the gear group G is composed of spur gears G1 to G4 and diverting gears 45 and 46, and the rotational drive bodies 47 and 48 for power branching are provided on one gear G1 of the spur gears G1 to G4, the inner blade 9 The power branching structure for driving different blades, for example, the kirizori blade 7 and the center blade 11 can be simplified, and the internal structure of the razor head 2 can be simplified accordingly. Examples of the rotational drive bodies 47 and 48 include an eccentric cam and an eccentric pin that reciprocally drive the vibrators 49 and 50.
[0017]
When the first transmission chamber 27 is partitioned by the motor base 22 and the head frame 23 fixed to the upper surface of the motor base 22, the gear group G is assembled on the upper surface of the motor base 22, and then the head frame 23 is put on the motor base 22. The first transmission chamber 27 can be hermetically sealed with only a small amount of work that requires only assembling. Further, when the second transmission chamber 28 is defined by the cover 34 that covers the partition wall 29 of the motor base 22, the side wall 33 of the head frame 23, and the outer surfaces of the both 29 and 33, the winding transmission mechanism is simply removed. The entire H can be exposed to facilitate maintenance. For example, it is possible to easily replace the timing belt 55 and check the operating state of the tension mechanism 56.
[0018]
Covering at least the front and rear peripheral surfaces of the first transmission chamber 27 with the peripheral walls 22a and 23a that overlap the inside and the outside prevents the leakage of gear sound more reliably than when the first transmission chamber 27 is defined by only one peripheral wall. Thus, the noise reduction of the power transmission mechanism can be promoted, and the quietness when using the rotary electric shaver can be improved accordingly.
[0019]
When the interior of the first transmission chamber 27 is divided into two by the sound insulation wall 65 and the gear group G is accommodated in the gear chamber 66 between the sound insulation wall 65 and the partition wall 29, the chamber adjacent to the gear chamber 66 through the sound insulation wall 65 is washed with water. Even if the drain outlet is open, gear noise can be prevented from leaking directly from the previous opening by the sound insulation wall 65, so that the noise reduction of the power transmission mechanism can be further promoted.
[0020]
If the sound insulating wall 65 is formed so as to face the partition wall 29 along the outline of the gear group G, the entire volume of the gear chamber 66 can be made as small as possible. That is, the amount of space in which the gear noise resonates can be further reduced, and the sound pressure level of the gear noise can be reduced by the amount that can suppress the resonance sound.
[0021]
When the winding mechanism H is configured by using the timing belt 55 as a transmission element, and the tension mechanism 56 is disposed outside the slack side transition locus of the timing belt 55, the load increases rapidly and the timing belt 55 is moved outside on the slack side. As shown in FIG. 8, the tension mechanism 56 presses the timing belt 55 in the direction in which the winding angle increases to suppress the previous jump as shown in FIG. 8, so that the tension mechanism is placed inside the belt trajectory. Compared with the case where the timing belt 55 is provided, it is possible to reliably prevent the timing belt 55 from slipping and reliably perform power transmission when the load suddenly increases.
[0022]
【Example】
1 to 8 show an embodiment of a water-washing type electric shaver according to the present invention. In FIG. 2, the electric razor has a main body case 1 and a razor head 2 provided on the upper part thereof, a vertically long display panel 3 is provided on the front surface of the main body case 1, and a switch button 4 for starting the motor and A mode switching button 5 for switching the operation mode and an indicator lamp 6 for displaying the switching state of the buttons 4 and 5 are provided. As shown in FIG. 5, on the rear surface of the main body case 1, there are provided a saw blade (blade body) 7 and a slide knob 8 for raising and lowering the saw blade 7. The razor head 2 is provided with a pair of front and rear inner blades 9 and 10 and a center blade (blade body) 11.
[0023]
As shown in FIG. 3, the main body portion below the razor head 2 includes an irregular cylindrical main body case 1 whose upper and lower ends are opened, an electrical component unit 13 inserted and loaded from the upper surface side into the inside thereof, and a lower surface of the case The razor head 2 is fixed to the upper part of the electrical component unit 13 through a seal 15. The electrical component unit 13 is loaded in the main body case 1, the electrical component unit 13 and the bottom case 14 fitted in the main body case 1 are fastened with screws, the previous seal 15 is brought into close contact with the inner surface of the main body case 1, Sealing the fastening portion on the bottom case 14 side with an O-ring or packing prevents water from entering the main body case 1 and enables the razor head 2 to be washed with water. The electrical component unit 2 is formed by assembling a motor 17, a secondary battery 18, a switch, an LED, a circuit board 19 on which electronic components and the like are mounted on a plastic molded inner frame 16. A watertight packing 20 is provided on the output shaft portion of the motor 17.
[0024]
In FIG. 4, the razor head 2 includes a motor base 22 to which the motor 17 is fixed, a head frame 23 formed in an inverted portal shape, an inner blade support base 24, an inner blade frame 25, and an outer blade holder 26. Etc. The inner cutter 9 is assembled to the inner cutter frame 25, and the outer cutter 10 and the center cutter 11 are assembled to the outer cutter holder 26, respectively. A first transmission chamber 27 is defined in the lower part of the razor head 2, and a second transmission chamber 28 is defined on one side thereof. Both transmission chambers 27 and 28 are partitioned in a sealed manner by a partition wall 29 as will be described later.
[0025]
The motor base 22 is composed of a frame having an upper surface surrounded by front and rear walls and left and right walls, and a motor 17 is fixed to the lower surface. As shown in FIG. 4, the left peripheral side wall is the first partition wall 29. The motor holder 30 that is externally fitted and fixed to the lower half of the motor 17 is supported so as to be movable up and down with respect to the inner frame 16, and is further pushed up and biased by a spring 31 (see FIG. 1). That is, the entire razor head 2 is supported so as to be able to float in the front-rear, left-right, and vertical directions with respect to the inner frame 16. A space between the motor base 22 and the motor holder 30 is hermetically sealed with the previous seal 15.
[0026]
The head frame 23 has a case portion 32 that opens downward, and side walls 33 that are erected on both the left and right sides of the case portion 32, and the case portion 32 is bonded and fixed to the motor base 22 in a cover-like manner. A first transmission chamber 27 is defined between the joining surfaces of 22 and 32. In this joined state, the side wall 33 and the partition wall 29 are flush with each other, and the second transmission chamber 28 is defined by both of them 29 and 33 and the cover 34 that is put on them. The cover 34 is detachably engaged with the side wall 33. The right cover 35 is provided with a release button 36 for unlocking the outer blade holder 26.
[0027]
The inner blade support base 24 is composed of a base portion 24a having a section that opens upward, a pair of left and right arms 24b erected from both left and right ends, and a lid body 24c that closes the upper surface opening of the base portion 24a. By supporting the shafts provided on the left and right arms 24b on the upper portion of the side wall 33 of the head frame 23, the inner blade support base 24 is pivotally supported so that it can swing back and forth, that is, swingable relative to the head frame 23. The An inner blade frame 25 described later is detachably press-fitted and engaged between the pair of arms 24b. Inside the pedestal base 24a, a lock mechanism is provided for locking the outer blade holder 26 that is externally fitted to the inner blade support base 24 so that it cannot be removed.
[0028]
The inner blade frame 25 has a base wall 38 and a pair of side walls 39 erected on both left and right ends of the base wall 38, and a pair of front and rear inner blades 9 are rotatably supported between the upper ends of both side walls 39. is doing. A small-diameter inner blade gear 40 is fixed to the left inner blade shaft toward FIG. 4, and this gear 40 meshes with a passive gear 41 provided on the inner blade support base 24, so that the motor power is increased and decreased. At the same time, the inner blade 9 is communicated. In order to clean the inner blades, a rotating brush 42 is disposed below each inner blade 9, and the left and right ends thereof are rotatably supported by slide pieces assembled to the side walls 39.
[0029]
The power of the motor 7 is first transmitted laterally through the gear group G accommodated in the first transmission chamber 27 and then upward by the winding transmission mechanism H accommodated in the second transmission chamber 28. This is transmitted to the pair of front and rear inner blades 9 via the inner blade gear 40 (see FIG. 1). In FIG. 6, the gear group G is provided between four spur gears G1 to G4 that transmit the motor power by decelerating, the intermediate shaft 44 that is horizontally supported by the partition wall 29, and the final gear G4 of the gear group G. A pair of turning gears 45 and 46 are provided. The turning gears 45 and 46 are each bevel gears. The intermediate shaft 44 is rotatably supported by a metal bearing 61 fixed to the partition wall 29, and both ends of the intermediate shaft 44 protrude into the first and second transmission chambers 27 and 28, respectively. The turning gear 46 is fixed, and the driving pulley 52 of the winding transmission mechanism H is fixed to the other end. In order to prevent the gear noise generated from the gear group G from being transmitted from the first transmission chamber 27 to the second transmission chamber 28 through a material, a partition wall 29 is provided between the two chambers 27 and 28.
[0030]
As shown in FIG. 1, two eccentric cams (rotary drive bodies) 47 and 48 are provided on the upper part of the spur gear G1 of the first stage fixed to the output shaft 17a of the motor 17, and these eccentric cams are provided. 47 and 48, the oscillating blade vibrator 49 and the center blade vibrator 50 can be simultaneously driven to reciprocate. Note that the kirizori blade 7 inherits the previous reciprocating power only when the slide knob 8 is slid upward. As described above, when the motor power is branched by the eccentric cams 47 and 48 provided in the first stage spur gear G1 and the vibrators 49 and 50, for example, when the power is branched from a gear group rotating around the horizontal axis. In comparison, it is possible to simplify the power branching structure and prevent the internal structure of the razor head 2 from becoming complicated.
[0031]
As shown in FIG. 7, the winding transmission mechanism H includes a driving pulley 52 fixed to the intermediate shaft 44, a driven pulley 54 fixed to the final gear shaft 53, and a timing belt 55 wound around both pulleys 52 and 54. And a tension mechanism 56 disposed outside the slack side transition locus of the timing belt 55.
[0032]
The driving pulley 52 and the driven pulley 54 are each made of an injection molded product made of a tough plastic material such as polyacetal or polyamide resin, and the timing belt 55 is made of a molded product in which polyimide fibers are mixed in urethane rubber. In order to facilitate the replacement of the timing belt 55, a washer-like flange 62 having a diameter larger than that of the driving pulley 52 is detachably attached to the intermediate shaft 44 protruding from the outer surface of the driving pulley 52 as shown in FIG. Thus, the flange 62 is held by a boss 63 that supports the shaft end of the intermediate shaft 44 so that it cannot be removed.
[0033]
The tension mechanism 56 includes an arm 57 pivotally supported by the side wall 33, a tension roller 58 pivotally supported at the tip of the arm 57, and a biasing force of the arm 57 toward the timing belt 55. And a torsion coil spring 59. The tension roller 58 circumscribes the slack side outer peripheral surface of the timing belt 55 and presses the slack side belt surface to the tension side when the timing belt 55 jumps outwardly on the slack side as shown in FIG. Then, the tension of the timing belt 55 is adjusted. In order to secure an arrangement space for the tension mechanism 56, the intermediate shaft 44 is slightly shifted from the vertical plane passing through the center of the final gear shaft 53 to the rear side.
[0034]
The timing belt 55 is replaced every time its endurance period expires. In this case, the cover 34 is first removed from the side wall 33 as shown in FIG. When the flange 62 is removed from the intermediate shaft 44 in this state, the outer surface of the driving pulley 52 is opened, so that the timing belt 55 can be easily removed from the driving pulley 52. Finally, the timing belt 55 is pulled out above the driven pulley 54 as indicated by an arrow, and the belt is replaced by removing the belt end from between the peripheral surface of the driven pulley 54 and the wall facing the peripheral surface. The power timing belt 55 can be separated from both pulleys 52 and 54. The new timing belt 55 can be attached to both pulleys 52 and 54 through the reverse procedure.
[0035]
The first transmission chamber 27 in the above-described embodiment is actually provided with a drain outlet for discharging water that enters during washing, and is difficult to completely seal. Thus, when an opening occurs in the peripheral wall of the first electric chamber 27 for some reason, a sound insulating wall 65 is provided inside the first electric chamber 27 as shown in FIGS. The side of the gear chamber 66 that accommodates the group G and the side of the opening are divided by a sound insulation wall 65. Further, the front and rear surfaces of the first transmission chamber 27 are arranged between the peripheral wall 22a of the motor base 22 and the head frame 23 as shown in FIG. The gear wall noise can be reliably prevented from being covered with the peripheral wall 23a. The previous sound insulation wall 65 partitions the first electric chamber 27 in a state of facing the partition wall 29 along the outline of the gear group G, so that the space in which the gear group G is accommodated, that is, the resonance space is minimized, In this respect, gear noise can be reduced.
[0036]
In addition to the above embodiment, the present invention can drive the inner blade 9 with the transmission structure shown in FIGS. In FIG. 14, the spur gear G1 fixed to the output shaft 17a of the motor 17 and the face gear G2 meshing with the spur gear G2 are turned while decelerating, and further, the third and fourth spur gears G3 and G4 are used. The decelerated power is transmitted to the driving pulley 52 via the intermediate shaft 44. In FIG. 15, the power of the horizontally placed motor 17 is decelerated by a pair of spur gears G 1 and G 2 and transmitted to the driving pulley 52 via the intermediate shaft 44.
[0037]
In addition to the above, the partition wall 29 can be provided on the side of the head frame 23 and can be provided over both the motor base 22 and the head frame 23. The present invention can also be applied to an electric razor in which only one inner blade 9 is provided. The inner blade support 24 and the inner blade frame 23 of the razor head 2 may be supported by the head frame 23 so as not to swing. Further, the inner blade support 24 and the inner blade frame 25 may be fixed to the head frame 23 having the front and rear walls in addition to the side wall 33.
[Brief description of the drawings]
FIG. 1 is a longitudinal front view of a razor head.
FIG. 2 is a front perspective view of an electric razor.
FIG. 3 is an exploded front view in which only a main body case is sectioned.
FIG. 4 is an exploded front view of a razor head.
FIG. 5 is a vertical side view of a razor head.
6 is a cross-sectional view taken along line AA in FIG.
FIG. 7 is a side view of the winding transmission mechanism.
FIG. 8 is a side view of the winding transmission mechanism during power transmission.
FIG. 9 is a perspective view showing a timing belt replacement procedure.
FIG. 10 is a plan view of a motor base showing another embodiment of the electric mechanism according to the present invention.
FIG. 11 is a bottom view of a head frame showing another embodiment.
FIG. 12 is a cross-sectional plan view of the first electric chamber.
13 is a sectional view taken along line BB in FIG.
FIG. 14 is a longitudinal front view showing another embodiment of the power transmission mechanism.
FIG. 15 is a longitudinal sectional front view showing still another embodiment of the power transmission mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Main body case 2 Razor head 9 Inner blade 10 Outer blade 17 Motor 22 Motor base 23 Head frame 27 1st transmission chamber 28 2nd transmission chamber 29 Partition 44 Intermediate shaft 52 Driving pulley 54 Driven pulley 55 Timing belt 65 Sound insulation wall G Gear group G1 ~ G4 Spur Gear H Winding Transmission Mechanism

Claims (7)

The razor head (2) at the top of the body case (1) has an inner blade (9) that is driven to rotate around the horizontal axis,
A first transmission chamber (27) is defined in the lower part of the razor head (2), and a second transmission chamber (28) is defined on one side of the razor head (2), and the motor power is the first transmission. The gear group housed in the chamber (27), and then transmitted to the inner blade (9) via the winding transmission mechanism (H) housed in the second transmission chamber (28) ,
The first transmission chamber (27) and the second transmission chamber (28) are hermetically separated by a partition wall (29) provided between both chambers (27, 28).
The partition wall (29) to the intermediate shaft to the transmission power of the gear group (G) to the winding transmission mechanism (H) (44) Ri Ah and is provided,
The interior of the first transmission chamber (27) is divided by the sound insulation wall (65),
Gear chamber (66), a rotary electric shaver gears (G) is that is housed between the sound insulating wall and (65) and the partition wall (29).   The rotary electric shaver according to claim 1, wherein the gear group (G) comprises a reduction gear mechanism that decelerates the motor power and transmits the motor power to the winding transmission mechanism (H). A gear group (G) is provided between the plurality of spur gears (G1 to G4) for reducing the motor power and the final gear (G4) and the intermediate shaft (44) of the gear group (G). It is composed of a pair of turning gears (45, 46) for converting the rotational power of the step gear (G4) into rotational power around the intermediate shaft (44),
A rotary drive body (47/48) that branches power for driving a blade body (7/11) different from the inner blade (9) to any one gear (G1) of the spur gears (G1 to G4). The rotary electric shaver according to claim 1 or 2, characterized in that it is provided. The first transmission chamber (27) is partitioned by a motor base (22) on which the motor (17) is mounted on the lower surface side and a head frame (23) fixed on the upper surface of the motor base (22),
A second transmission chamber (28) includes a partition wall (29) of the motor base (22) and a side wall (33) of the head frame (23), and a cover (34) covering the outer surfaces of the partition wall (29) and the side wall (33). The rotary electric shaver according to claim 1, 2 or 3, which is partitioned by   The rotary electric shaver according to claim 1, 2, 3, or 4, wherein at least the front and rear peripheral surfaces of the first transmission chamber (27) are covered with peripheral walls (22a, 23a) overlapping the inner and outer multiples. The rotary electric shaver according to any one of claims 1 to 5 , wherein the sound insulating wall (65) is formed so as to face the partition wall (29) along the outline of the gear group (G) . A winding transmission mechanism (H) includes a driving pulley (52) fixed to the intermediate shaft (44), a driven pulley (53) disposed at the upper end of the second transmission chamber (28), and both pulleys (52, 53). The rotary according to any one of claims 1 to 6, comprising a timing belt (55) wound around and mounted on a slack side transition locus of the timing belt (55) and a tension mechanism (56). Electric razor of the formula .

Images