JPH0574325U - Electric toothbrush drive mechanism - Google Patents

Abstract

(57) [Summary] The present invention relates to a linear reciprocating motion drive system for an electric toothbrush. [Purpose] The present invention is a drive system designed to realize smooth linear reciprocating motion and to reduce noise as compared to the conventional one. [Structure] A drive system in which a pin mounted on the drive shaft linearly reciprocates while tracing the groove of the groove cam by rotating the groove cam that has been decelerated by the motor through a gear.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric toothbrush having a high brushing effect, and more specifically to a drive mechanism.

[0002]

[Prior Art]

 The conventional electric toothbrush is a motor built into the body to be gripped, and is configured to swing (roll) the toothbrush attached to its drive shaft within an angle range of about 60 degrees. Is said to be good for cleaning the teeth of the back teeth and the space between the teeth.

[0003]

[Problems to be solved by the device]

 However, in the prior art in which the toothbrush is swung (rolling), the tips of the brush bristles B in the toothbrush A move largely in an arc as shown in FIG. 6, so that a fine recess F between the tooth C and the gum D is formed. Since the bristle tip of the brush bristle B did not enter, it was difficult to remove stains such as tooth C and gum D. The boundary between the teeth and gums is a place where food waste and plaque are likely to accumulate, and the food waste and plaque often cause periodontal diseases such as tooth decay and alveolar pyorrhea. Further, since the conventional electric toothbrush moves at a high speed, there is a risk that the gums may be damaged by long-time use or strong pressing.

[0004]

[Means for solving the problem]

 In order to solve the above problems, the present invention decelerates the rotation of the motor built in the main body, cuts the groove cam on the reduced rotation shaft, and the pin of the drive shaft to which the toothbrush is attached traces the groove to make a linear reciprocating motion. In addition, smooth linear reciprocating motion can be achieved by using a low rotation motor and increasing the gear reduction ratio.

[0005]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the drawings. 1 to 3 each show the structure of an electric toothbrush according to an embodiment of the present invention. FIG. 1 is a sectional view, and FIGS. 2 and 3 are explanatory views of a drive mechanism. .. As shown in FIG. 1, 1 is a motor, which is rotated by a battery 7. The gear 2 is press-fitted and fixed to the shaft of the motor 1 and meshes with the gear portion 13 of the groove cam 3. In addition to the gear portion 13, a groove portion 33 is formed in the groove cam 3 in the rotational direction, and is supported in the hole portion 18 of the case 8. A pin 4 is fixed to the drive shaft 5, and an upper portion of the pin 4 is guided by a groove portion 23 formed on the groove cam 3. Since the drive shaft 5 is supported by the case 8, it is restricted to move only in the axial direction, and the lower portion 24 of the pin 4 serves as a rotation stopper for the shaft due to the elongated hole of the case 8. A removable toothbrush 6 is set at the tip of the drive shaft 5. Next, the drive mechanism of the present invention will be described with reference to FIGS. Rotation is transmitted from the gear 2 to the gear portion 13 of the groove cam 3 as the motor 1 shown in FIG. At this time, due to the difference in the number of teeth of the gear 2 and the gear portion 13, the rotational speed of the grooved cam 3 is decelerated and the rotational torque is improved. It is possible to obtain a moving torque of 6). When the groove portion 23 formed in the groove cam 3 makes a half rotation due to the above structure, the drive shaft 5 and the toothbrush 6 move in the A direction as shown in FIG. The amount of movement L2 at this time becomes the same as the maximum amount of displacement L1 of the groove portion 23 of the groove cam 3, and when it makes another half rotation, it returns to the position of FIG. That is, when the groove cam 3 makes one rotation, the drive shaft moves back and forth the distance L1, and the toothbrush set on the drive shaft reciprocates the distance L2. Further, by changing the shape of the groove 23 in the groove cam 3, it is possible to change the stroke of the drive shaft 5 and the speed at the moment of reciprocating operation. FIG. 5 shows the relationship between the movement of the brush bristles and the tooth portion when reciprocating in a straight line. The distance L2 reciprocates in parallel with the recess F between the tooth C and the gum D. This allows the brush bristles 16 of the toothbrush 6 to enter the recess F and remove dirt such as dental plaque in the recess. In this embodiment, the cam groove is provided on the groove cam 3 side, but a cylindrical rib cam may be used as shown in FIG. 4 to provide a groove on the drive side.

[0007]

[Effect of the device]

 As is clear from the above description, according to the present invention, the smooth linear reciprocating motion of the toothbrush has the effect of removing plaque and dirt by polishing between the teeth at a speed that does not hurt the gums. is there.

[Brief description of drawings]

FIG. 1 is a sectional view of a drive mechanism of the present invention.

FIG. 2 is an explanatory view of a drive mechanism.

FIG. 3 is an explanatory view of a drive mechanism.

FIG. 4 is a sectional view of a drive mechanism when a cylindrical rib cam is used instead of the groove cam.

FIG. 5 is a front view and a side view during brushing according to the present invention.

FIG. 6 shows a state during brushing by a rolling method.

[Explanation of sign]

 1 Motor 2 Gear 3 Groove Cam 4 Pin 5 Drive Shaft 6 Toothbrush 7 Battery 8 Case

Claims (1)

[Scope of utility model registration request] A drive mechanism for an electric toothbrush characterized in that the rotation of a motor is reduced by a gear, a groove cam is cut on the reduced rotation shaft, and a pin of a drive shaft for attaching a toothbrush makes a linear reciprocating motion while tracing the groove of the groove cam.