JPS59153635A - Angle of radiation adjustment device for car headlight - Google Patents

Abstract

PURPOSE:To simplify structure and reduce the price of the captioned device, performing multistage adjustment of an angle of radiation of a headlight through remote control of the like from a driver's seat, by realizing command control of slanting movement of a headlight and control of quantity of said movement by means of only one multistage control member. CONSTITUTION:Configuration of the captioned device is as follows. A headlight holding body, slantingly moved round its pivot by rotation of a motor 9 of a driving part 2 through a nut-shaped movable element 35, a letter L-shaped operational lever 40 and a driving body, puts the optical axis of the headlight in slanting movement. A rotary plate 12 is rotated by rotation of the motor 9 through a wheel train and a deceleration part. The rotary plate 12 forms, together with many fixed contact points 13A-13E installed in opposition to it, a multistage changeover control part 10, while two semicircular conductive parts 14, 15 are formed on the face of its sliding contact with the fixed contact points 13A-13E. Each of contact points 13A-13E is connected to each of changeover contact points 30A-30E of a multistage changeover switch 8 determining a slant angle of the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an illumination angle adjustment device for a vehicle headlamp. Specifically, it relates to an adjustment device that can adjust the irradiation angle of the headlights, which are tiltably held relative to the vehicle body, in multiple stages by remote control from the lotus seat, etc., and uses a simple control circuit and mechanism. An object of the present invention is to provide a novel vehicular headlamp illumination angle adjustment device that can perform stable adjustment operations.

In vehicles, especially automobiles, the vehicle body and axle are subject to continuous action by a suspension system consisting of leaf springs, coil springs, etc., so if a large load is applied to the front or rear side of the vehicle body, 1 The posture of the vehicle body is either forward or backward, and this changes the beam angle of the headlights relative to the road surface, impairing driving safety. There is a danger that the driver of an oncoming vehicle may be seriously dazzled.

OBJECT OF THE INVENTION Therefore, the present invention seeks to provide an adjustment device that can adjust the irradiation angle of a headlight by remote control from the driver's seat. It is an object of the present invention to provide a novel vehicular headlamp illumination angle adjustment device that can perform adjustment operations.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a headlamp that is tiltably held relative to a vehicle body, and a headlamp! The driving part includes a motor, a driving part that is moved relative to the vehicle body by the motor and connected to a part of the headlamp, and a multi-stage switching control part. The operating section includes an operation switch having a movable contact and a plurality of switching contacts whose connections are switched by the movable contact, and the multi-stage switching control section includes a plurality of fixed switches each connected to the plurality of switching contacts. The rotary plate is provided with a contact point and a rotary plate that rotates in contact with the fixed contact point, and the rotary plate is relatively rotated according to the movement of the driving body, and has a substantially semicircular band shape on a surface that contacts the plurality of fixed contacts. A motor drive relay is connected to each conductive part, and the movable contacts of each 1J relay are inserted into the motor drive circuit, and these contacts is the above two I
J Reka (shortened when Tekken Kotaku excitation, 1 each
Connect the motor to the power supply circuit so that when one of the two forces is excited, the motor will rotate in the forward direction, and when the other is excited, the motor will rotate in the reverse direction. When the movable contact surface of the operating switch is connected to one of the fixed contacts, the movable contact wall of the operating switch contacts the fixed contact.
The relay connected to E is energized, which in turn causes the motor to rotate forward or reverse, and the motor's fixed contact contacts the conductive Nn by rotation of the plate. It is characterized by the fact that the motor stops rotating when it becomes stiff.

By doing this, it is possible to adjust the irradiation angle of the headlight in multiple stages using only a small number of @13 materials, and it is possible to perform stable adjustment operations with ease.
It is possible to provide an irradiation angle adjustment device for a vehicle headlamp that has a large length.

EXAMPLES Below, the details of the irradiation angle adjustment device for a vehicle headlamp according to the present invention will be described in detail according to the examples shown in the accompanying drawings.

FIG. 1 is a diagram illustrating the entire irradiation angle adjustment device for a vehicle headlamp according to the present invention, which is composed of a headlamp 1, a driving section 2, an operating section 3, and a power source 4. As shown in FIG.

The headlamp 1 is held by a headlamp holding member 5, and a support piece 6 provided at the upper part of the holding member 5 is rotatably attached to the vehicle body. It is connected to the tip of the drive body 7 of the drive unit 2 . The drive unit 2 is fixedly attached to the vehicle body near the headlight 1 via I/), and is equipped with a drive body 7 that is movable relative to the vehicle body. By displacing it and the headlight 1
The connection point with the headlight 1 is displaced relative to the vehicle body, thereby changing the inclination of the headlight 1 relative to the vehicle body. Contains 8.

FIG. 2 shows a control circuit of the irradiation angle adjusting device 6 for a vehicle headlamp according to the present invention, which will be described in further detail. 9 is a DC motor included in the drive unit 2;
The motor 9 causes the drive body 7 to be displaced relative to the vehicle body. Reference numeral 10 denotes a multi-stage switching control section, which is composed of a rotary plate 12 fixed to a shaft 11 which is rotationally driven by a drive section 2, and a large number of fixed contacts 13A, 13B, . . . Q, 13E. The rotating plate 12 has a substantially disk shape, and is rotated clockwise and counterclockwise by rotation of the shaft 11. The fixed contacts 13A, 13B, .
, 13B, . . . 13E and the rotary plate 12 are arranged so that the relative positional relationship between them is changed according to the displacement of the driving body 7.

On the surface of the rotary plate 12 that is in contact with the contacts 13A, 13B, . .) has been formed. Conductive parts 14 and 1
Reference numeral 5 has a substantially semicircular band shape formed by removing approximately 180 degrees different portions of a circular conductive region, and the removed portions serve as insulating portions 16 and 17. Further, the fixed contacts 13A, 13B, and φ and Φ13E are arranged at appropriate intervals on the rotation locus of the conductive parts 14 and 15, and are arranged on the rotation locus that falls within a center angle of approximately 180 degrees. Such fixed contacts 13A, 13B, Φ
・Although the M configuration of 13'E is not necessarily defined or restricted to the above range, at least the fixed contact 1
3A, 13B, . It is said that the arrangement is as follows.

Reference numerals 18 and 19 are connection terminals arranged on the rotation loci of the conductive parts 14 and 15, and fixed contacts 13A, 13B, φ/
They are arranged at both ends of the group of φ13H in the arrangement direction, one connecting terminal 18 is always kept in contact with one Q main part 14, and the other connecting terminal 7-19 is connected to the other lead; 15 is maintained at all times. The connection terminals 18 and 19 are connected to the motor! 51st motion relay 2
0 and 21. The relay 20 is a forward rotation relay, and the -force connection terminal 18 is connected to one terminal of the excitation m coil of the forward rotation relay 20, and the relay 21 is a reverse rotation relay, and the other connection terminal 19 is connected to the excitation coil of the forward rotation relay 20. is connected to one terminal of the excitation coil of the reversing relay 21. Note that the other terminal of the magnetic dynamic coil of each relay 20 and 21 is grounded.

22 is a motor drive circuit including the above-mentioned motor 9;
Relays 20 and 21 are inserted into motor drive circuit 22. 23 has a movable contact of the relay 20, which is connected to the common terminal CT1 connected to the normal rotation side input terminal 24 of the motor 9, and when the relay 2'0 is de-energized, it is contacted to the ground side terminal BT. When the relay 20 is energized, the power supply side terminal MT1 is connected to the power supply side terminal MT1. Also, 2
Reference numeral 5 denotes a movable contact of the relay 21, which is connected to a common terminal CT2 connected to the reverse input terminal 26 of the motor 9, and is in contact with the ground side terminal BT2 when the relay 21 is de-energized. When the relay 21 is energized, it is brought into contact with the power supply side terminal MT2. And the ground side terminal B
T1 and B T2 are both grounded, and power supply side terminals MT1 and MT2 are respectively connected to the positive side terminal 27 of the power supply 4.
It is connected to the.゛However, relay 20
When the movable contact 23 is excited, the movable contact 23 connects to the power supply side terminal MT1.
As a result, the normal rotation side input terminal 24 of the motor 9 is connected to the positive side terminal 27 of the power supply 4, and the motor 9 is connected to the positive side terminal 27 of the power supply 4.
is rotated in the forward rotation direction, and when the relay 21 is energized conversely, its movable contact 25 is brought into contact with the power supply side terminal MT2,
As a result, the motor 9 has the reverse side input terminal 26 connected to the power supply 4.
The motor 9 is connected to the positive terminal 27 of the motor 9 and is driven to rotate in the reverse direction. When the relays 20 and 21 are not energized, both terminals 24 and 26 of the motor 9 are short-circuited.

Reference numeral 8 denotes a multi-stage changeover switch included in the operation unit 3, and the changeover switch 8 has a movable contact 29 having a common terminal 28 connected to the positive terminal 27 of the power source 4, and is connected to the common terminal 28 by the movable contact 29. It is equipped with a large number of switching contacts 30A, 30B, . The switching contacts 30A, 30B, .

As mentioned above, the rotary plate 12 is rotated as the motor 9 of the drive unit 2 is driven to rotate, and in the illustrated embodiment, the rotating direction is determined by the excitation of the relay 20. When the motor 9 is rotated in the forward direction, it is rotated counterclockwise, that is, in the direction of the solid arrow in the figure, and when the relay 21 is energized, the motor 9 is rotated in the reverse direction. At this time, it is rotated clockwise, that is, in the direction of the dashed arrow in the figure. When the motor 9 is rotated in the forward rotation direction, the headlight 1 is rotated in the reverse direction with the headlight 1 pointing upward in the direction shown by the solid line arrow in the figure. When this happens, the headlight 1 is tilted in the direction indicated by the broken line arrow in the figure, that is, in the downward direction.

Therefore, the changeover contacts 30A, 30B of the changeover switch 8,
..., 30H and connect the movable contact 29 to it, the current from the power source 4 passes through the path of the common terminal 28 → movable contact 29 → switching contact 30 → fixed contact 13. The relay flows from one of the conductive parts 14 or 15 in contact with the fixed contact 13 connected to the switching contact 30 selected by the movable contact 29 through one of the connection terminals 18 or 19. 20
or 21. And relay 20
or 21 is energized, its coil is excited, and thereby the movable contact 23 or 25 of the relay 20 or 21 is brought into contact with the power supply side terminal MT1 or MT2, and the motor 9 rotates in the forward or reverse direction. be done. When the motor 9 is rotationally driven, the driving body 7 is moved relative to the vehicle body, thereby tilting the headlamp 1 upward or downward, and rotating the rotary plate 12.

When the rotary plate 12 is rotated and its insulating part 16 or 17 is brought into contact with said selected fixed contact 13, i.e. when said fixed contact 13 leaves contact with the conductive part 14 or 15,
Since the movable contact 23 or 25 of the relay 20 or 21 which was energized is connected to the ground terminal BT1 and Br3, and the ends r-24 and 25 of the motor 9 are ignored, the motor 9 is braked and does not rotate. The rotation of the rotating plate 12 is stopped, and the movement of the driving body 7 is also stopped. This causes the headlamp 1 to stop tilting.

3 to 5 show an example of a specific mechanism of the drive section 2, and the mechanism shown in FIGS. 3 to 5 will be described below.

There is a reduction gear 4y on the upper side inside the casing 31 which is divided into two.
A DC motor 9 with a diameter of J, 32 is attached, and a feed screw 33 is rotatably supported on the lower side inside the casing 31, and this feed screw 33 is used for the reduction Jjy! . 3
A groove 38 formed to extend along the axial direction of 3.
39, and thereby is held by the casing 31 so as to be slidable along the axial direction of the feed screw 33. Reference numeral 40 designates an operation lever for tilting the headlamp, which has an abbreviated shape.The rear end of the forked part 41.42 of this lever 40 is engaged with the protrusion 36.37 of the movable member 35, and The bent base of the casing 31 is pivotably attached to the opening of the casing 31 by means of a pin 43. Further, a driving body 7 is rotatably connected to the tip of the bent portion 44 of the lever 40 that protrudes outside the casing 31, and a spherical portion 45 at the tip of the driving body 7 is attached to the headlamp holding portion barb 5. It is fitted into a spherical recess 46 provided on the back surface of the lower part 5a. A gear 47 is fixed to the base of the feed screw 33, and is engaged with a transmission gear 50 fixed to an input shaft 49 of a reduction gear part 48, which is made up of a plurality of gears (not shown), and controls the rotation of the output shaft 34 of the reduction gear 32. The signal is transmitted to the speed reduction section 48 via gears 47 and 50. 11 is the output shaft of the reduction unit 48 and the rotary plate 1
2, and its tip is connected to the bottom wall 51 of the reduction unit 48 of the casing 31 and the bottom wall 51 below the bottom wall 51.
It passes through fixed contact mounting plates 52 provided at intervals of 1,000 mm, and the rotary plate 12 is fixed at the point where it passes through the fixed contact mounting plate 52. A large number of holes 53.53,...φ are formed in the fixed contact receiving plate 52, and the fixed contacts 13A, 13B,...
, 13E and the connecting terminals 18 and 19 are fitted with their respective tips protruding downward from the bottom surface of the plate 52, and each tip is attached to the side of the rotary plate 12 facing the mounting plate 52. is in contact with the surface. And each fixed contact 13A, 13
B, fist..., 13E and connection terminal 18.19 are formed with flanges 54, 54,..., and each flange 5
4.54, . . . have one end connected to the bottom wall 51 of the casing 31.
Coil springs 55, 55, ... in contact with the lower surface
The other end is elastically abutted, and this spring 55
．． 55, each fixed contact 13A, 1 due to the elastic force of meeting...
3B, . In addition, each fixed contact 13A, 13B, pot Φ, 13
E and each flange 54.54 of the connection terminal 18.19,・
. . . have connection terminals 56, 56, . . . and fists protruding, respectively, and fixed contacts 13A, 13B, . . . , 1
The connection terminals 56, 56, . . . , fists of 3H are connected to the changeover contacts 3OA, 30B, . Connection terminals 56.56 are connected to the coils of relays 20 and 21.

In the drive section having the above configuration, when the motor 9 is rotated, the rotation is transmitted to the feed screw 3 via the reducer 32.
Further, as the feed screw 33 rotates, the movable element 35 moves along the axial direction of the feed screw 33 to rotate the lever 40 around the pin 43. Further, this rotational force moves the driving body 7 in the front-back direction, thereby tilting the headlamp 1. When the feed screw 33 is rotated, the rotation is transmitted to the speed reducer 4 through the gears 47 and 50.
8 and is transmitted to the rotating plate drive shaft 11, thereby rotating the rotating plate 12. Therefore, when the rotary plate 12 is rotated to a position where the fixed contact 13 connected to the changeover contact 30 selected by the changeover switch 8 contacts the insulating part 16 or 17 of the rotary plate 12, the motor drive circuit 22 is short-circuited. As a result, the motor 9 is stopped.

Next, the operation of adjusting the illumination angle of the headlight l by operating the operation switch 8 will be described in more detail using an example with reference to FIG.

First, a case will be described in which the changeover contact 30C is selected in the changeover switch 8 and the movable contact 29 is connected to it from the state shown in FIG. When the movable contact 29 of the changeover switch 8 and the changeover contact 30C are connected, the fixed contact 13c is connected to the IF source 4 via the changeover switch 8. Since the fixed contact 13C is currently in contact with one of the conductive parts 14, the current from the power source 4 is transferred to the movable contact 29 of the changeover switch 8→
The flow is as follows: switching contact 30C→fixed contact 13C→conductive part 14→strapping terminal 18→coil of relay 20→ground.

As a result, the relay 20 is energized and its movable contact 23
is connected to the power supply side terminal MT1, so the current from the power supply 4 also flows to the motor drive circuit 22 from the movable contact 23 of the relay 20 → the motor 9 → the movable contact 25 of the relay 21 → ground, and the motor 9 is rotated in the normal direction. Ru. When the motor 9 is rotated in the normal direction, the driving body 7 is moved in the direction of arrow A in FIG. 3, and thereby the headlamp 1 is rotated in the direction shown by the solid line arrow in FIG. At the same time, the rotary plate 12 is rotated counterclockwise, and the conductive part 14 first leaves contact with the fixed contact 13B, then leaves the contact with the fixed contact 13C, and the fixed contact 13C becomes an insulating part. 17, and is placed in a state where it is not in contact with either of the conductive parts 14 and 15 (the state shown in FIG. 6(A)). Fixed contact 13
When C is brought into contact with the insulating part 17, the movable contacts 23 and 25 of the relays 20 and 21 both connect to the ground side terminals BT and BI.
3 and the two terminals 24 and 26 of the motor 9 are short-circuited, so the motor 9 stops rotating and the rotating plate 12
The rotation of the drive body 7 and the movement of the drive body 7 are also stopped. Therefore, the direction of the headlight 1 is determined by the tilt angle at the time when the driver 7 moves or stops.

Next, from the state shown in FIG. 6(A), select the changeover contact 30B with the changeover switch 8 and connect it to the top 2p, '
The case where 29 is connected will be explained. When the movable contact 29 of the changeover switch 8 and the changeover contact 30B are connected, the fixed contact 13B is connected to the power source 4 via the changeover switch 8. Since the fixed contact 13B is currently in contact with the other conductive part 15, the current from the power source 4 flows from the movable contact 29 of the changeover switch 8 to the changeover contact 30B to the fixed contact 13B.
The flow is from the conductive part 15 to the connection terminal 19 to the coil of the relay 21 to the ground. As a result, the movable contact 25 of the relay 21 is connected to the power supply terminal MT2, and the current from the power supply 4 flows through the motor drive circuit 22 from the movable contact 25 → motor 9 → movable contact 23 → ground, and the motor 9 is rotated in the reverse direction. be rotated. When the motor 9 is reversed, the drive body 7 is moved in the direction opposite to the arrow in FIG. 3, and thereby the headlamp 1 is rotated in the direction shown by the dashed arrow in FIG. 2, that is, in a downward direction. I'm going to go. At the same time, the rotary plate 12 is rotated clockwise, and the conductive part 15 leaves contact with the fixed contact 13B, and the fixed contact 13B comes into contact with the insulating part 17. (the state shown in FIG. 6(B)). Fixed contact 1
3B is brought into contact with the insulating part 17, the circuit through which current flows to the relay 21 is opened, so that the movable contacts 23 and 25 of the relays 20 and 21 are both connected to the connection terminals BTI and BI3, and the terminals 24. 26 is short-circuited, the motor 9 is stopped from rotating, and the rotation of the rotating plate 12 and the driving body 7 are stopped.
movement will also be stopped. Therefore, the direction of the headlight l is determined by the tilt angle at the time when the movement of the driver 7 is stopped.

FIG. 7 shows another embodiment of the rotary plate, in which the conduction ratio g
11 and the motor drive relay, the stability of operation is further improved. The same portions of the rotary plate 12A shown in this embodiment as those in the rotary plate shown in the above-mentioned embodiment will be given the same symbols as in the above-mentioned embodiment, and a detailed explanation will be omitted.

14A and 15A are terminal conductive parts formed by partially extending each conductive area from the center of each conductive part 14 and 15 toward the periphery of the rotary plate 12, and the terminal conductive parts 14A and 15A have terminal conductive parts, respectively. Connection terminals 57 and 58 are provided.

One ends of coil springs 59 and 60 made of a conductive material are connected to the connection terminals 57 and 58, and the other ends of the coil springs 59 and 60 are connected to an appropriate inner wall of the casing 31 of the drive unit 2. and connected to the excitation coils of relays 20 and 21, respectively. When the rotary plate 12A is rotated, one end of each coil spring 59, 60 is moved following the rotation of the rotary plate 12A, and the coil springs 59 and 60 are expanded. When the rotation of the rotary plate 12A is stopped, the coil springs 59 and 60 stop moving and extending their ends at that position. Therefore, the current flowing through each conductive part 14 and 15 is transmitted from each terminal conductive part 14A and 15A to each connection terminal 5.
7 and 58 and the respective coil springs 59 and 60 to the excitation coils of the nine relays 20 and 21.

According to the connection means for connecting the rotary plate 12A, each of the conductive parts 14 and 15, and the relays 20 and 21 as described above, the rotary plate 1
The tensile force of the coil springs 59 and 60 brakes the action of the motor 2A being further rotated past the contact stop position between the multi-stage switching control section 13 and the insulating section 16 or 17, which is selected based on the rotational inertia of the motor 9, etc. This prevents the tilting of the headlamp l from overrunning, and since both conductive parts 14 and 15 alternately contact the selected fixed contact 13, the headlamp l It is also possible to prevent a small hunting operation of l, and to perform stable irradiation angle adjustment operation.

Effects of the Invention As is clear from the above description, the irradiation angle adjustment device for a vehicle headlamp of the present invention comprises a headlamp held so as to be tiltable with respect to the vehicle body, and a drive for tilting the headlamp. Department and
an operating section for operating the driving section; includes a switch having a movable contact and a plurality of switching contacts whose connections are switched by the movable contact, and the multi-stage switching control section includes a plurality of fixed contacts connected to the plurality of switching contacts, respectively, and the fixed contacts. a rotary plate that rotates in contact with the rotary plate, the rotary plate is relatively rotated according to the movement of the driving body, and the surface that contacts the plurality of fixed contacts has two conductive conductive plates in the shape of approximately semicircular bands. A motor drive relay is connected to each conductive part, and the movable contact of each relay is inserted into the motor drive circuit, and these contacts are connected to each other when both of the two relays are de-energized. The motor is connected to the power circuit so that when either relay is energized, the motor rotates in the forward direction, and when the other relay is energized, the motor rotates in the reverse direction. When the movable contact of the operation switch is connected to one of the fixed contacts, the relay connected to any conductive part that comes into contact with the fixed contact is energized, thereby causing the motor to rotate in the normal direction. Alternatively, the rotation of the motor is stopped when the fixed contact and the conductive part are separated from each other due to the rotation of the rotary plate as the motor rotates.

Therefore, according to the present invention, command control of the tilting operation of the headlamp and control of its operation amount can be performed by one multistage control member, so that the control circuit and control mechanism can be simplified. Therefore, it is possible to provide a vehicular headlamp illumination angle adjustment device that has few failures and can be constructed at low cost.

In the above embodiment, a common power source is provided for the relay circuit and the motor circuit, but it is also possible to distinguish between the two and provide a separate power source for the motor circuit.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the irradiation angle adjustment device for a vehicle headlamp according to the present invention. Fig. 1 shows the overall concept, Fig. 2 shows the overall circuit diagram, and Fig. 3 shows the driving section. FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3, FIG. 5 is an enlarged perspective view showing the fixed contact group and the rotating plate, and FIGS. ) is a plan view of the main part showing an example of the operation of the rotating plate, No. 7
The figure is a perspective view of essential parts showing another embodiment of the rotary plate. Explanation of symbols 1... Headlight, 2... Life/drive part, 3... Operation part, 4... Power supply, 7... Drive body, 8... Operation switch, 9... Motor , 10... Multi-stage switching control unit, 12... Rotating plate, 13AN13E... Fixed contact, 14.
15...Conducting part, 29...Movable contact of operation switch, 3C)A~30E...Switching contact of operation switch Applicant: Koito Seisakusho Co., Ltd. figure

Claims (1)

[Claims] i1j Equipped with a headlamp held so as to be tiltable relative to the vehicle body, a drive unit that tilts the headlight, and an operation unit that operates the drive unit, and the drive unit includes a motor and a position relative to the vehicle body. The driving body is moved and connected to a part of the headlamp, and the operating unit includes a multi-stage switching control unit, and the operating unit includes an operating switch having a plurality of switching contacts whose connections are switched by a movable contact on a T37 moving contact. , the multi-stage switching control unit includes a plurality of fixed contacts each connected to the plurality of switching contacts, and a rotary plate that rotates in contact with the fixed contacts, the rotary plate having one
x, relatively rotated according to the movement of the foot moving body, and
Two approximately semicircular conductive parts are formed on the surface that contacts the plurality of fixed contacts, each conductive part is connected to a motor drive relay, and the movable contact of each relay is connected to a motor drive relay. are inserted into the circuit, and these contacts are short-circuited when both of the two contacts are de-energized,
The motor is connected to the power supply circuit so that when either one of the relays is energized, the motor rotates in the forward direction, and when the other is energized, the motor is rotated in the reverse direction. When the movable contact of the switch is connected to one of the fixed contacts, a relay connected to any of the conductive parts in contact with the fixed contact is energized, thereby causing the motor to rotate forward or reverse;
An irradiation angle adjustment device for a vehicle headlamp, characterized in that the rotation of the motor is stopped when the fixed contact and the conductive part are separated from each other due to the rotation of the rotary plate as the motor rotates.