JPS6159749B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention is characterized in that a drive element that converts the rotation of a motor into reciprocating motion and transmits it to a movable blade is slidable back and forth with respect to a fixed blade together with the movable blade. The present invention relates to a hair cutter in which a fixed blade and a movable blade at the front and rear of the movable blade have blade edge configurations corresponding to normal hair cutting and plowing, respectively.

[Background technology]

Figure 1 shows a conventional example of the above hair cutter.
It is shown in FIG. In the figure, 1 is a main body to which a blade block 2 is attached to the front end, and a motor 3 is installed inside.
A driver 4 for converting the rotation of the motor 3 into reciprocating motion is provided. Blade block 2 is base 20
A fixed blade 21, a movable blade 22, and a pressing spring 23 are mounted on one side of the
It is constructed by attaching and. As is clear from FIG. 3, the driver 4 whose tip is connected to the guide plate 24 fixed to the movable blade 22 is composed of a main body 41 and a support 42, and the rectangular frame-shaped main body 41 has a rear end on the upper surface. It has a spring seat 49, an engagement groove 43 on the front rear surface, and both side pieces 44, 44 are thin and highly flexible. The support base 42, which is press-fitted and fixed to the rear end of the main body 41, has a pair of ribs 45, 45 running back and forth on its lower surface as shown in FIG. Both ribs 45, 45 fit between 11,
The back and forth movement of the holder 42 is guided by the rails 11, 11. Further, the support stand 42 has one end pivoted to the main body 1 and the other end connected to the switch handle 10 through the elongated hole 1 in the center of the lever 12.
3 and a pin 47 that engages with the pin 3.

However, the eccentric shaft 5 attached to the output shaft of the motor 3
is assembled so as to engage with the engagement groove 43 of the driver element 4, and as the motor 3 rotates, the driver element 4 bends both side pieces 44, 44 of the main body part 41, and the main body part 4 The front part of the blade reciprocates left and right, and this movement drives the movable blade 22. Then, by operating the stitch handle 10, the driver 4 moves back and forth through the lever 12 while being guided by the rails 11, 11, and the movable blade 22 also moves back and forth, changing the blade configuration of the fixed blade 21 and the movable blade 22. It can be switched between one compatible with cutting and one compatible with plowing.

Here, a driver 4 that converts rotation into reciprocating motion
Since it is designed to be able to move back and forth and is not completely fixed to the main body 1, it inevitably rattles when rotated by the motor 3, causing noise and a loss of driving force. . Therefore, it is necessary to apply spring pressure to hold the driver element 4 so that it does not wobble, but in the past, as shown in FIGS. 5 and 6, the rear end of the main body 41 of the driver element 4 The spring seat 49 provided in
By arranging a coil spring 9 between the drive element 4 and the inner surface of the main body 1, spring pressure is applied to the drive element 4. However, in this case, the direction in which the spring pressure is applied by the coil spring 9 changes due to the back and forth movement of the driver element 4, and at the same time the coil spring 9 tilts, and the spring force causes a force that presses the driver element 4 against the rail 11. In particular, when the drive element 4 and the movable blade 22 shown in FIG. 6 are moved back to correspond to plowing, the drive element 4 becomes the fulcrum of the load P that causes the drive element 4 to float. Distance from the rear end of the contact part with the rail 11 to the line of action of the spring pressure F of the coil spring 9 _{l 1}
However, since the spacing _l2 between the fulcrum and the front end of the driver 4, on which the load P is applied, is extremely short, rattling is likely to occur, and furthermore, the coil spring 9 itself is This has the disadvantage that it obstructs the back and forth movement of the blade, making it difficult to smoothly switch between cutting and plowing. Further, since the spring seat 49 is provided at the upper rear end of the driver 4, the entire driver 4 cannot be molded in one piece, and the driver 4 is inevitably made of two members, the main body 41 and the support base 42.
It has also become necessary to form a

[Purpose of the invention]

The present invention has been developed in view of these points, and its purpose is to provide a drive element that does not rattle, generates noise, or causes loss of driving force, and is capable of cutting and plowing. To provide a hair cutter that allows smooth switching between hair clippers and hair clippers.

[Disclosure of the invention]

The present invention provides a hair cutter capable of switching between plowing and cutting by the back-and-forth movement of the movable blade and the drive element as described above, in which one end of a pressing spring is attached to the back of the guided surface of the drive element relative to the back-and-forth movement of the main body. The invention is characterized in that the two parts are slidably brought into contact with each other, and the present invention will be described in detail with reference to the embodiment shown in Fig. 7. In the figure, 1 is a main body, 2 is a blade block, The blade block 2 is fixed to the front end by stop springs 31, 31 in an inclined state with respect to the longitudinal direction of the main body 1. The blade block 2 has a fixed blade 21 fixed to the inner surface of a base 20 as in the conventional example, and a guide plate 24 fixed to the movable blade 22 at the tip of a pressing spring 23 whose base is attached to the base 20. By connecting the movable blade 22 to one side of the fixed blade 21, the movable blade 22 is configured to be in contact with one surface of the fixed blade 21. On the other hand, a motor 3 is fixed inside the main body 1, and a driver 4 is attached so as to be movable back and forth. The driver 4 here is constructed by fitting a pair of ribs 45, 45 on the lower surface of the support base part 46 between a pair of rails 11, 11 formed on the inner surface of the main body 1.
1 and 11, the support base portion 46 is guided in this way,
Flexible side pieces 44, 44, and motor 3
an engagement groove 4 in which an eccentric shaft 5 attached to the output shaft engages;
3 and a front end portion which is provided with an engaging portion 48 connected to the movable blade 22 and can freely reciprocate left and right, and a pin 47 is formed at the lower part of the rear end.
It is equipped with This pin 47 has one end engaged with a long hole 13 in the center of the lever 12 supported by a shaft 15 protruding from the inner surface of the main body 1. A pin 14 at the other end of the lever 12 fits into a space surrounded by a rib 18 in a switch handle 10 that is attached to the main body 1 so as to be slidable back and forth. A current-carrying metal fitting 19 provided at the rear end of the switch handle 10 connects a pair of contact springs 2.
7 and 27 form a switch contact point, and a pin 26 protruding from the switch handle 10 engages between engaging ribs 29 and 29 of a display plate 28 facing the display window 16 of the main body 1.

Now, the pressing spring 6 for eliminating rattling of the driver 4 is formed of a wire spring, and the base end is connected to the main body 1 by a support seat 17 on the inner surface of the main body 1 and a partition plate 30.
The tip is fixed to the support base part 4 in the drive element 4.
6, that is, the back surface of the contact surface with the rails 11, 11, in a slidable manner.

However, in the case of this hair cutter, when the switch handle 10 is moved forward from the state where the blade configuration is suitable for plow cutting as shown in FIG. 13, the driver 4 is pushed forward via the lever 12. , the driver 4 slides forward along the rail 11 of the main body 1, and the movable blade 22 also moves forward to assume a blade configuration corresponding to the cut, as shown in FIG. At the same time, the current-carrying metal fitting 19 of the switch handle 10 short-circuits the pair of contact springs 27, 27, causing current to flow through the motor 3, so that the motor 3 starts rotating. This rotation is made into a reciprocating motion by the driver 4 that engages the eccentric shaft 5 with the engagement groove 43, and the movable blade 2
2 can be conveyed. At this time, the display board 28 is moved forward together with the switch handle 10, and "Cut" is displayed on the display window 16. 1st
Figure 5 shows a state in which the switch handle 10 is turned off from this cut state, and the engagement between the pin 14 of the lever 12 and the rib 18 of the switch handle 10 has some play. Therefore, the blade configuration remains in a state corresponding to the cut. The engagement between the protrusion 26 of the switch handle 10 and the pair of engagement ribs 29, 29 of the display plate 28 is similar, and the display window 16 displays "cut".
It remains as it is. If the switch handle 10 is further slid rearward from this state, the driver 4 and the movable blade 22 are pulled rearward via the lever 12 and moved back, as shown in FIG. At the same time as the blade configuration, the energizing metal fitting 19 of the switch handle 10 is connected to a pair of contact springs 27, 27.
is short-circuited to energize the motor 3, and the protrusion 26 of the switch handle 10 moves back the display board 28, causing the display window 16 to display "Plowing".
From the state shown in FIG. 16, switch handle 1
When 0 is turned off, the state shown in FIG. 13 is obtained.

The driver element 4 and the movable blade 22 move back and forth in the above manner, but since the pressing spring 6 presses the driver element 4 by slidably contacting the driver element 4, there is no gap. The pressing spring 6 does not hinder the movement of the drive element 4 when switching between mowing and cutting, so that the switching is performed smoothly. In addition, the effect of the above-mentioned fulcrum and the pressing spring 6 on the dimension l ₂ from the rear end of the contact area between the rail 11 and the driver 4, which is the fulcrum of the load P on which the driver 4 is lifted, to the front end of the driver 4, on which the load P is applied. The dimension l ₁ between the lines is long and l 1 /l 2 both in the cut state shown in Fig. 11 and in the plow-cut state shown in Fig. _{12 .}
The value of is kept large. In other words, the pressure spring 6 efficiently suppresses the rattling of the driver 4 using its spring pressure.

Because of this configuration, it is possible to integrally mold the entire drive element 4, that is, the support part 46 that is the guided part of forward and backward movement, and the part that converts rotation into reciprocating movement, which reduces the number of parts. This makes it possible to improve assembly efficiency. Although the pressing spring 6 is made of a wire spring in the illustrated example, it may be a plate spring or a torsion coil spring as long as it comes into sliding contact with the driver 4 and applies spring pressure. It is also possible to use a spring in the shape of .

〔Effect of the invention〕

As described above, in the present invention, the pressure spring does not impede the movement of the driver when switching between plowing and cutting, and the switching is smooth, and in either state, the pressure spring This device efficiently prevents the driver from rattling due to the spring pressure, and does not generate noise or lose driving force, and is advantageous for downsizing because the spring constant of the pressure spring can be small. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the conventional example, FIG. 2 is an exploded perspective view of the same as the above, FIG. 3 is an exploded perspective view of the driver of the same as the above, and FIG. 4 is a perspective view showing the lower surface of the support base of the driver of the same as the above.
5 and 6 are sectional views of essential parts of the same as above, FIG. 7 is a sectional view of an embodiment of the present invention, FIG. 8 is an exploded perspective view of the same, and FIG. 9 is a bottom view of the driver of the above. Figure 10 is a partial cross-sectional view of the same as above, Figures 11 and 12 are sectional views of essential parts of the same, Figures 13, 14, 15 and 16 are plan views of the same. 1 is the main body, 3 is the motor, 4 is the driver, and 6
11 is a pressing spring, 11 is a rail as a guide member,
21 is a fixed blade, 22 is a movable blade, 43 is an engagement groove, 4
Reference numeral 6 denotes a support base portion having a guided surface on one side.

Claims (1)

[Scope of Claims] 1. A drive element that converts the rotation of the motor into reciprocating motion and transmits it to the movable blade is slidable back and forth with respect to the fixed blade together with the movable blade, and is fixed by the back and forth movement of the movable blade with respect to the fixed blade. In a hair cutter in which the cutting edge configuration of the blade and the movable blade corresponds to cutting and plowing, respectively, the guided surface is guided in forward and backward movement by contacting a guide portion provided on the main body to which the fixed blade is fixed. is provided on a support base of a reciprocating part of a driver, and one end of a pressing spring is slidably abutted on the back surface of a guided surface of the support base. 2. The hair cutter according to claim 1, wherein the reciprocating portion of the driver and the support portion are integrally formed.