CN1050991C

CN1050991C - Oscillating electric toothbrush

Info

Publication number: CN1050991C
Application number: CN 95116475
Authority: CN
Inventors: 沈仲山
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-09
Filing date: 1995-10-09
Publication date: 2000-04-05
Anticipated expiration: 2015-10-09
Also published as: CN1147368A

Abstract

The present invention is a pendulum-type electric toothbrush comprising: establish the body of motor and battery in to the bearing lid sets firmly the bearing at the body top, and the drive shaft that the hinge was located on the bearing can receive the motor through a drive mechanism and rotate and can inlay the toothbrush body of inserting in the drive shaft, its characterized in that: the transmission mechanism comprises a driven body, a driving shaft and a driving shaft, wherein the driven body is fixedly arranged at the bottom end of the driving shaft in the bearing seat, and a bearing rod is arranged on the driven body; a driving body which is arranged on the motor output shaft in the bearing seat, is provided with a deflector rod corresponding to the bearing rod and continuously rotates along with the motor; a rotary spring, which is disposed between the driving shaft and the bearing seat, and can drive the driven body, the driving body and the toothbrush body to rotate by the motor, and can be swung back by the elastic force of the spring, so that the toothbrush body can perform swinging type tooth brushing.

Description

pendulum type electric toothbrush

本发明涉及一种电动牙刷，尤指一种在回摆时具有适度弹震作用的电动牙刷。The invention relates to an electric toothbrush, in particular to an electric toothbrush with a moderate springing effect when swinging back.

错误的刷牙方式或习惯，不但无法彻底清洁牙齿，更容易因此损伤牙龈，而造成难以弥补的伤害。定时且正确的刷牙方法，是保持口腔卫生及健康的唯一途径，依照牙医学最新的研究报道，刷牙的最佳方式，乃是顺着牙齿的间隙，作垂直方向的刷动，同时在刷动回摆时最好有间歇的弹震作用，如此不但不会伤及牙龈，且可获得最佳的清洁效果！一般人若未经过一番学习及训练，是很难养成上述正确之刷牙习惯及方式的，如能将上述的刷牙动作，结合于电动牙刷之中，而以特殊设计的机构来完成，则很自然地，可使一般消费者广泛地享受上述刷牙之方法，而带给清洁健康的牙齿。Wrong brushing methods or habits not only fail to clean teeth thoroughly, but also easily damage the gums and cause irreparable damage. Regular and correct brushing method is the only way to maintain oral hygiene and health. According to the latest research reports in dentistry, the best way to brush your teeth is to brush vertically along the gap between the teeth, while brushing It is best to have intermittent vibration when swinging back, so that not only will it not hurt the gums, but also the best cleaning effect can be obtained! It is difficult for ordinary people to develop the above-mentioned correct teeth-brushing habits and methods without some study and training. If the above-mentioned brushing actions can be combined with an electric toothbrush and completed with a specially designed mechanism, it will be very easy. Naturally, the above-mentioned method of brushing teeth can be widely enjoyed by general consumers, thereby bringing clean and healthy teeth.

本发明的目的，是提供一种符合上述震动式刷牙方法的电动牙刷。The object of the present invention is to provide a kind of electric toothbrush that meets above-mentioned vibratory tooth brushing method.

本发明的摆震式电动牙刷，主要包含：一本体，内装设马达及电池组，可以开关控制马达的运转；一承座，以承座盖固定于本体顶部上，内设传动机构；一驱动轴，铰设在承座上，可受马达经传动机构传动作预定角度往复转动；一牙刷体，嵌插在驱动轴端，而随驱动轴一起作往复转动；其特征在于该传动机构，包含：一从动体，固设于承座内的驱动轴末端上，并设有一承杆；一驱动体，设于承座内的马达输出轴上，其上对应承杆处设有一拨杆，乃随马达的运转连续回转，可推动承杆作预定转角的转动，然后自动与承杆脱离；一转回弹簧，设于驱动轴与承座间，可驱使被推动后而脱离的从动体及驱动轴弹震复位。The pendulum-type electric toothbrush of the present invention mainly comprises: a body, in which a motor and a battery pack are installed, which can switch and control the operation of the motor; a seat, which is fixed on the top of the body with a seat cover, and a transmission mechanism; The shaft is hinged on the bearing seat and can be rotated reciprocatingly at a predetermined angle by the motor through the transmission mechanism; a toothbrush body is embedded in the end of the drive shaft and reciprocates with the drive shaft; it is characterized in that the transmission mechanism includes : a driven body, fixed on the end of the drive shaft in the bearing seat, and provided with a bearing rod; a driving body, arranged on the motor output shaft in the bearing seat, on which a driving rod is arranged corresponding to the bearing rod, It rotates continuously with the operation of the motor, which can push the bearing rod to rotate at a predetermined angle, and then automatically disengage from the bearing rod; a revolving spring is installed between the drive shaft and the bearing seat, which can drive the driven body to be separated after being pushed And drive shaft elastic reset.

藉此，可藉马达带动驱动体、从动体、驱动轴及牙刷体作间歇转动，并藉转回弹簧的弹力将从动体、驱动轴及牙刷体弹震回摆，使牙刷体作摆震式的刷牙动作。In this way, the motor can be used to drive the driving body, driven body, drive shaft and toothbrush body to rotate intermittently, and the driven body, drive shaft and toothbrush body can be bounced back to swing by the elastic force of the return spring, so that the toothbrush body can swing Vibrating brushing action.

本发明为达到上述目的，所来用的技术手段及其功效，兹举二较佳实施例，并配合附图详述如下：In order to achieve the above object, the present invention uses technical means and effects thereof, hereby give two preferred embodiments, and cooperate with accompanying drawing to describe in detail as follows:

图1是本发明第一实施例之立体分解图；Fig. 1 is the three-dimensional exploded view of the first embodiment of the present invention;

图2是本发明第一实施例之组合剖视图；Fig. 2 is a combined sectional view of the first embodiment of the present invention;

图3A、3B、3C、3D是本发明第一实施例传动机构之动作示意图；3A, 3B, 3C, and 3D are schematic diagrams of the action of the transmission mechanism of the first embodiment of the present invention;

图4是本发明第二实施例之局部立体分解图；Fig. 4 is a partial three-dimensional exploded view of the second embodiment of the present invention;

图5A、5B、5C、5D是本发明第二实施例之局部组合图，同时显示其传动机构之动作状态。5A, 5B, 5C, and 5D are partial assembly diagrams of the second embodiment of the present invention, showing the operating state of its transmission mechanism at the same time.

参阅图1和2：本发明由一本体1、一马达2、一承座3、一驱动轴4、一传动机构5、一夹头6、一承座盖7、一锁紧帽8、一牙刷体9以及一封盖99等所组成；其中，Referring to Fig. 1 and 2: the present invention consists of a body 1, a motor 2, a bearing 3, a drive shaft 4, a transmission mechanism 5, a chuck 6, a bearing cover 7, a locking cap 8, a The toothbrush body 9 and the cover 99 etc. are composed; wherein,

本体1呈长筒形，顶部开设一轴孔11，周缘设有螺纹12，内部顶端形成马达固定室13，供装设马达2，其底部设一电池容室14，可容设电池15，以提供马达2运转所须电源，其底端锁合一底盖16，以利更换电池15。马达2装设于马达固定室13内，其输出轴21可凸伸出轴孔11外部。The main body 1 is in the shape of a long cylinder, with a shaft hole 11 on the top and a screw thread 12 on the periphery. A motor fixing chamber 13 is formed at the top of the interior for installing the motor 2. A battery chamber 14 is provided at the bottom of the body, which can accommodate a battery 15. Provide the necessary power for the operation of the motor 2, and lock a bottom cover 16 at its bottom to facilitate the replacement of the battery 15. The motor 2 is installed in the motor fixing chamber 13 , and its output shaft 21 can protrude out of the shaft hole 11 .

承座3亦呈筒形，位于本体1顶部上，其顶部开设一轴孔31，该轴孔31上下各设有轴承座32a、32b，轴承座32a、32b中各嵌设有小轴承33a、33b，承座3底部开设成腔室34，腔室34上横向开设一缺槽35。The bearing seat 3 is also cylindrical and is located on the top of the main body 1. A shaft hole 31 is opened on the top of the shaft hole 31. Bearing seats 32a, 32b are respectively arranged on the upper and lower sides of the shaft hole 31, and small bearings 33a, 32b are respectively embedded in the bearing seats 32a, 32b. 33b, a chamber 34 is opened at the bottom of the seat 3, and a slot 35 is opened transversely on the chamber 34.

驱动轴4乃穿设于承座3二轴承33a、33b中，可灵活自由转动。The drive shaft 4 is passed through the two bearings 33a, 33b of the bearing seat 3, and can rotate flexibly.

传动机构5乃由：一从动体51、一驱动体52以及一蜗形转回弹簧53组成，从动体51呈环筒形，固设于驱动轴4底端上，并容设在承座3的腔室34内；其上设有承杆511，承杆511内端伸入环内，外端容设于承座3的缺槽35中，以限制转动角度；驱动体52固设干马达2输出轴21上，其上有一拨杆521，并容置在从动体51内，可随马达2运转；转回弹簧53设于从动体51与承座3间；最重要的是：该从动体51与马达2的输出轴21(和拨杆521)间，形成偏心设置，因此当马达2运转时，可藉拨杆521推动从动体51的承杆511及驱动轴4作预定角度的转动，然后藉转回弹簧53的弹力弹摆复位，产生适度的弹震作用。The transmission mechanism 5 is composed of: a driven body 51, a driving body 52 and a snail-shaped return spring 53. The driven body 51 is in the shape of a ring cylinder, fixed on the bottom end of the driving shaft 4, and accommodated in the bearing In the chamber 34 of the seat 3; there is a bearing rod 511 on it, the inner end of the bearing rod 511 extends into the ring, and the outer end is accommodated in the slot 35 of the bearing seat 3 to limit the rotation angle; the driving body 52 is fixed On the output shaft 21 of the dry motor 2, there is a lever 521 on it, which is accommodated in the driven body 51 and can run with the motor 2; the return spring 53 is arranged between the driven body 51 and the seat 3; the most important Yes: the driven body 51 and the output shaft 21 of the motor 2 (and the driving rod 521) are eccentrically arranged, so when the motor 2 is running, the driving rod 511 and the driving shaft of the driven body 51 can be pushed by the driving rod 521 4. Make a predetermined angle of rotation, and then reset by bouncing with the elastic force of the return spring 53 to produce a moderate bouncing effect.

夹头6中央开设一轴孔61，并固设于驱动轴4上，其顶部形成一推拔夹持头62，夹持头62上开设若干轴向槽621，当其受压时，可产生径向紧缩现象，以夹紧牙刷体9。A shaft hole 61 is opened in the center of the chuck 6, and is fixed on the drive shaft 4. A push-pull clamping head 62 is formed on the top of the clamping head 62. A number of axial grooves 621 are provided on the clamping head 62. When it is pressed, it can produce Radial tightening phenomenon, to clamp toothbrush body 9.

承座盖7顶部中央开设一轴孔71，周缘设有螺纹72，内部形成一承座固定室73，底端设一凸缘74，乃套设于承座3上，并藉一锁环75套于凸缘74上而将之锁固于本体1顶部螺纹12上，其上设有电气开关76，以控制马达2的运转。A shaft hole 71 is opened in the center of the top of the seat cover 7, a thread 72 is provided on the periphery, a seat fixing chamber 73 is formed inside, and a flange 74 is provided at the bottom, which is sleeved on the seat 3, and a lock ring 75 Put it on the flange 74 and lock it on the thread 12 at the top of the body 1, on which an electric switch 76 is arranged to control the operation of the motor 2.

锁紧帽8中央开设一轴孔81，轴孔81底部设有滚珠轴承82，其内壁上设有螺纹83，可螺设于承座盖7顶部螺纹72上，当将之向下旋紧时，可利用轴承82的推拔状内环821来压底夹头6的推拔夹持头62，使其产生缩收的夹持作用。A shaft hole 81 is set in the center of the lock cap 8, and the bottom of the shaft hole 81 is provided with a ball bearing 82, and its inner wall is provided with a thread 83, which can be screwed on the thread 72 at the top of the seat cover 7, when it is screwed down , the push-pull inner ring 821 of the bearing 82 can be used to press the push-pull clamping head 62 of the bottom chuck 6, so that it produces a shrinking clamping effect.

牙刷体9的底部凸设一结合杆91，可嵌插于夹头6的轴孔61中，再藉锁紧帽8将之锁紧，可与驱动轴4结合成一体作摆震式刷牙运动。封盖99乃盖设于承座盖7之的面(如图2)。The bottom of the toothbrush body 9 is protrudingly provided with a connecting rod 91, which can be inserted into the shaft hole 61 of the chuck 6, and then locked by the locking cap 8, and can be combined with the drive shaft 4 for pendulum brushing movement . The cover 99 is to cover the surface of the seat cover 7 (as shown in FIG. 2 ).

参阅图1和2，为本发明第一实施例之使用情形：将牙刷体9的结合杆91插入夹头6中，并以手旋紧锁紧帽8，使牙刷体9与驱动轴4稳固结合成一体，再按下开关76，即可藉马达2来带动牙刷体9产生震动式刷牙动作。Referring to Figures 1 and 2, it is the use situation of the first embodiment of the present invention: insert the coupling rod 91 of the toothbrush body 9 into the chuck 6, and tighten the locking cap 8 by hand, so that the toothbrush body 9 and the drive shaft 4 are stable Combining them into one body, and then pressing the switch 76, the motor 2 can be used to drive the toothbrush body 9 to produce a vibration brushing action.

参阅图2和3，为本发明第一实施例之动作情形：一开始，驱动轴4受转回弹簧53的作用，使固定其上的承杆511抵靠在承座3的缺槽35一侧上，因此驱动轴4及牙刷体9均保持静止，而偏心设置的驱动体52受马达2的带动而回转(如图3A所示)；驱动体52继续旋转，使其拨杆521推动从动体51上的承杆511一起旋转，因此驱动杆4以及牙刷体9可同步旋转(如图3B所示)，该牙刷体9的转动角度，可藉拨杆521之偏心度及长度，或承座3的缺槽35长度、位置等来设定；驱动体52继续旋转，由于偏心设置的结果，其拨杆521将滑离承杆511，因此，脱离的驱动轴4及牙刷体9将受转回弹簧53的弹力作用，而弹回原位，并在弹回使承杆511撞击于缺槽35上的同时，产生适度的弹震作用，使刷牙动作更有效(如图3C、3D所示)；驱动体52再继续运转时，又可再推动弹摆复位的承杆511，而产生连续性循环动作，使牙刷体9产生间歇性的摆动及弹震运动，以利于刷牙。Referring to Fig. 2 and 3, it is the action situation of the first embodiment of the present invention: at the beginning, the driving shaft 4 is subjected to the effect of the return spring 53, so that the bearing rod 511 fixed on it is against the gap 35 of the bearing seat 3 - On the side, therefore drive shaft 4 and toothbrush body 9 all keep static, and the driving body 52 that eccentrically arranges is driven by motor 2 and turns (as shown in Figure 3A); The supporting rod 511 on the moving body 51 rotates together, so the driving rod 4 and the toothbrush body 9 can rotate synchronously (as shown in Figure 3B). The length and position of the missing groove 35 of the bearing seat 3 are set; the driving body 52 continues to rotate, and as a result of the eccentric setting, its driving rod 521 will slide away from the bearing rod 511, so the disengaged driving shaft 4 and toothbrush body 9 will Under the elastic force of the return spring 53, it bounces back to its original position, and when the spring back makes the bearing rod 511 collide with the notch 35, it produces a moderate bounce effect, making the brushing action more effective (as shown in Figure 3C, 3D Shown); When the driving body 52 continues to run again, it can promote the bearing rod 511 that bounces and resets again, and produces a continuous cycle action, so that the toothbrush body 9 produces intermittent swinging and bouncing motions, so as to facilitate tooth brushing.

参阅图4和5所示：为本发明的第二实施例，主要是提供另一种可产生摆震运动的传动机构5，将有关部份详述如下(其余部份与前实施例相似，故不赘述)：Shown in Fig. 4 and 5: be the second embodiment of the present invention, mainly provide another kind of transmission mechanism 5 that can produce pendulum motion, relevant part is described in detail as follows (remaining parts are similar to previous embodiment, So I won’t go into details):

承座3设有脚座39，定置于本体1顶部上，并以承座盖将之固定于本体1上，其顶部中央的上下亦嵌设有小滚珠轴承33a、33b，以与驱动轴4连接，并于承座3底端环面36的内、外侧上对称设有内、外凸轨37、38。The bearing seat 3 is provided with a foot seat 39, which is fixed on the top of the main body 1, and is fixed on the main body 1 by a bearing cover, and small ball bearings 33a, 33b are also embedded in the upper and lower parts of the center of the top to communicate with the drive shaft 4 Connect, and be provided with inner and outer protruding rails 37,38 symmetrically on the inner and outer sides of the ring surface 36 at the bottom end of the seat 3.

传动机构5亦由从动体51、驱动体52以及一转回弹簧53等所组成；其中，该从动体51设有一承杆511，乃固设于驱动轴4底端上，并容设在承座3内；驱动体52呈盘状，乃滑动套设于马达2的非圆形输出轴21上(圆中为四角形)，可随输出轴21运转并可轴向滑移，输出轴21底端承环22及驱动体52间套设有一压缩弹簧54，可将驱动体52顶高与承座3环面36接触，其顶面524内、外侧上对应承座3之内、外凸轨37、38设有内、外凸轮522、523，内凸轮522内侧对应承杆511设有一凸起的拨杆521；转回弹簧53设于从动体51与承座3间；当马达2运转时可带动驱动体52运转，驱动体52同时受压缩弹簧54作用抵在承座3环面36上滑动，因此拨杆521可推动承杆511及驱动轴4作预定角度的转动，当驱动体52内、外凸轮522、523滑至内、外轨37、38上时，驱动体52将压抵弹簧54而下移，使拨杆521滑离承杆511，然后可藉转回弹簧53弹力将拨杆521及驱动轴4弹摆复位，产生适度的弹震作用。The transmission mechanism 5 is also composed of a driven body 51, a driving body 52, and a return spring 53; wherein, the driven body 51 is provided with a bearing rod 511, which is fixed on the bottom end of the drive shaft 4 and accommodates In the seat 3; the driving body 52 is disc-shaped, which is slidably sleeved on the non-circular output shaft 21 of the motor 2 (the circle is a square), and can run with the output shaft 21 and can slide axially. 21 A compression spring 54 is sleeved between the bottom bearing ring 22 and the driving body 52, so that the top height of the driving body 52 can be in contact with the ring surface 36 of the seat 3, and the inner and outer sides of the top surface 524 correspond to the inner and outer sides of the seat 3. The protruding rails 37, 38 are provided with inner and outer cams 522, 523, and the inside of the inner cam 522 is provided with a raised driving lever 521 corresponding to the bearing rod 511; the return spring 53 is arranged between the driven body 51 and the seat 3; when the motor 2. When running, it can drive the driving body 52 to run. The driving body 52 is pressed against the annulus 36 of the seat 3 by the action of the compression spring 54 to slide at the same time. Therefore, the driving rod 521 can push the supporting rod 511 and the driving shaft 4 to rotate at a predetermined angle. When the inner and outer cams 522, 523 of the driving body 52 slide onto the inner and outer rails 37, 38, the driving body 52 will press against the spring 54 and move down, so that the driving rod 521 will slide away from the bearing rod 511, and then the spring can be used 53 elastic force resets the driving rod 521 and the drive shaft 4 by bouncing, producing a moderate bouncing effect.

参阅图5所示，为本发明第二实施例之运作情形：受马达2传动的驱动体52，亦受压缩弹簧54的顶推上升，使凸轮522、523与承座3的环面36接触，而拨杆521亦上升与承杆511结合，因此可推动从动体51、驱动轴4及牙刷体9转动(如图5A所示)；驱动体52继续运转，当凸轮522、523滑移至凸轨37、38上时，驱动体52受迫下降，拨杆521亦下降滑离承杆511，因此从动体51，驱动轴4及牙刷体9不再继续转动(如图5B所示)，该牙刷体9的转动角度，可藉凸轨37、38及凸轮522、523之弧长，及相对位置的匹配来改变设定；驱动体52继续旋转，但从动体51、驱动轴4及牙刷体9则受转回弹簧53的弹力作用而弹回原位(如图5C所示)；驱动体52继续运转，使凸轮522、523滑离凸轨37、38，并受压缩弹簧54顶推，而再上升回到环面36上，因此拨杆521亦上升与被弹回原位的承杆511结合(如图5D所示)；因此驱动体52连续运转时，可产生连续性循环动作，使牙刷体9产生间歇性的摆动及弹震运动，以利于刷牙。Referring to Fig. 5, it is the operation situation of the second embodiment of the present invention: the driving body 52 driven by the motor 2 is also pushed up by the compression spring 54, so that the cams 522, 523 contact the ring surface 36 of the seat 3 , and the driving rod 521 also rises to combine with the bearing rod 511, so it can promote the driven body 51, the drive shaft 4 and the toothbrush body 9 to rotate (as shown in Figure 5A); the driving body 52 continues to run, and when the cams 522, 523 slip When on the convex rail 37,38, the driving body 52 is forced to descend, and the driving rod 521 also descends and slides away from the bearing rod 511, so the driven body 51, the driving shaft 4 and the toothbrush body 9 no longer continue to rotate (as shown in Figure 5B ), the rotation angle of the toothbrush body 9 can be changed by the arc length of the convex rails 37,38 and the cams 522,523, and the matching of the relative positions; the driving body 52 continues to rotate, but the driven body 51, the driving shaft 4 and the toothbrush body 9 are bounced back to the original position (as shown in Figure 5C) by the elastic force of the return spring 53; the driving body 52 continues to run, making the cams 522,523 slide away from the protruding rails 37,38, and are compressed by the spring 54 pushes, and then rises back on the ring surface 36, so the driving rod 521 also rises to combine with the bearing rod 511 that has been bounced back to its original position (as shown in Figure 5D); therefore, when the driving body 52 runs continuously, it can produce continuous The cyclic action makes the toothbrush body 9 produce intermittent swing and bounce motions, so as to facilitate brushing teeth.

综上所述，本发明的特点在于符合科学刷牙的要领，既能清洁牙齿，又能产生微震，操作简单，即使是孩童也无需严加训练即可得到正确的牙齿保洁，且牙刷头的更换十分方便，是一实用生很强的保健牙刷。To sum up, the feature of the present invention is that it conforms to the essentials of scientific tooth brushing. It can not only clean teeth, but also produce micro-vibration. It is easy to operate. Even children can get correct tooth cleaning without strict training, and the replacement of toothbrush Very convenient, is a practical and strong health care toothbrush.

Claims

An oscillating electric toothbrush comprising: the toothbrush comprises a body (1), a bearing seat (3), a driving shaft (4), a toothbrush body (9) and a transmission mechanism (5), wherein a motor (2) and a battery (15) are arranged in the body (1); the bearing seat (3) is fixed on the top of the body (1) through a bearing seat cover (7) and is internally provided with a transmission mechanism; the driving shaft (4) is hinged on the bearing seat (3); toothbrush body (9) inlay and insert in drive shaft (4) end, its characterized in that: the transmission mechanism (5) comprises a driven body (51), a driving body (52) and a rotary return spring (53), wherein the driven body (51) is fixedly arranged at the tail end of the driving shaft (4) in the bearing seat (3) and is provided with a bearing rod (511); the driving body (52) is arranged on a motor output shaft (21) in the bearing seat (3), and a driving lever (521) is arranged on the driving body corresponding to the bearing rod (511); the turning spring (53) is arranged between the driving shaft (4) and the bearing seat (3).
The oscillating electric toothbrush of claim 1, wherein: wherein, the driven body (51) of the transmission mechanism (5) is in a ring cylinder shape, the inner end of the bearing rod (511) extends into the ring, the driving body (52) is accommodated in the ring of the driven body (51), and the driven body (51) and the motor output shaft (21) are eccentrically arranged.
The oscillating electric toothbrush of claim 1, wherein: wherein, the bearing seat (3) is provided with a notch (35) for accommodating the outer end of the bearing rod (511) of the driven body (51), and the bottom end of the bearing seat cover (7) is provided with a flange (74) which is sleeved on the bearing seat (3).
The oscillating electric toothbrush of claim 1, wherein: wherein, a chuck (6) is fixedly arranged on the driving shaft (4), a shaft hole (61) is arranged at the center of the chuck, a push-pull clamping head (62) is formed at the top of the chuck, and a groove (621) is arranged on the clamping head; and a locking cap (8) is screwed on the top of the bearing seat cover (7).
The oscillating electric toothbrush of claim 1, wherein: wherein, the ring surface of the bottom end of the bearing seat (3) is provided with an inner convex rail (37) and an outer convex rail (38); the driving body (52) of the transmission mechanism (5) is in a disc shape and is sleeved on the noncircular output shaft (21) of the motor (2) in a sliding way, a compression spring (54) is sleeved between the output shaft (21) and the bottom of the driving body (52), the top end surface of the driving body is provided with inner and outer cams (522) and (523) corresponding to the inner and outer convex rails (37) and (38) of the bearing seat, and the deflector rod (521) of the driving body (52) is arranged on the inner side of the inner cam (522) and corresponds to the bearing rod (511) of the driven body (51).