JPH06269568A - Oscillation device - Google Patents

Abstract

PURPOSE:To eliminate need of putting on/off a motor drive switch manually by driving rotation of a motor by oscillating an oscillation part manually, transmitting motion of the oscillation part through interlock mechanism to the motor, and supplying a drive voltage to the motor 7 when an induced electromotive voltage higher than a specified value is generated at the motor. CONSTITUTION:Interlock mechanisms 16, 18 to transmit rotation of a motor 7 for driving an oscillation part 11 having a basket part for a baby, etc., to an oscillation part 11 are installed, and a motor control circuit to supply a drive voltage to the motor 7 when an induced electromotive voltage becomes a specified value or higher, and not to supply the drive voltage to the motor 7 when the induced electromotive voltage becomes lower than the specified value is installed. Operation of oscillating the oscillation part 11 or stopping the oscillation part is thus facilitated. In addition, since a limit switch for changing moving directions of the oscillation part is not required, a structure can be simplified, and because the motor is not energized unnecessarily, electric energy is not wasted uselessly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocking device which can be applied to a swinging mechanism (that is, a cradle), a seesaw, and a swinging mechanism or a reciprocating mechanism in various kinds of mechanical instruments, and more particularly to a unidirectional mechanism. And a swingable portion capable of repeatedly swinging after moving to another direction, moving in a direction opposite to the one direction, and again switching the moving direction to move in the one direction. The present invention relates to an oscillating device including a motor for driving the.

[0002]

2. Description of the Related Art A cradle for placing a baby in a suspended basket and rocking the basket for sleeping is conventionally used.

In such swinging, it is possible to drive a basket containing a baby by a motor so that the basket is moved. In this case, specifically, the rotation shaft that rotatably supports the car and the rotation shaft of the motor are connected by a linkage mechanism such as a gear mechanism to transmit the rotation of the motor to the rotation shaft. In addition to the motor drive switch, a pair of limit switches that detect that the car has moved to an appropriate position in one direction and the opposite direction, respectively, are provided separately from the motor drive switch. It is possible to switch the rotation direction of the motor in accordance with the moving direction of the car by inverting the flip-flop of the motor control circuit according to the state to switch the positive / negative direction of the drive voltage supplied to the motor.

In the agitator constructed as described above, when the motor drive switch is manually turned on to put the motor in the drive state, the motor rotates in the forward direction. It is transmitted to the car via a mechanism and the pivot respectively, which causes the car to move in one direction. Then, when this car moves to an appropriate position, one of the limit switches is turned on, so that the flip-flop of the motor control circuit is inverted to switch the rotation direction of the motor. The moving direction is switched by the driving force of and to move in the opposite direction. Since the switching of the moving direction of the car is continuously performed, the car containing the baby is continuously swung by using the motor as an auxiliary power source. Further, if the motor drive switch is manually turned off to stop the motor, the car is no longer driven by the motor.

[0005]

However, in the case of the above-mentioned swing, when the car for driving the baby is to be driven by the motor, it is necessary to manually turn on the motor drive switch. If the driving of the car is to be stopped, the operation is complicated because the motor driving switch needs to be manually turned off.

Further, since a pair of limit switches are provided for detecting that the basket for the baby has moved to an appropriate position and the direction of rotation of the motor is switched according to the switching state of these limit switches, the motor is driven. Since an extra limit switch is required in addition to the switch for the car and the car must always move to the vicinity of the appropriate position, it is difficult to freely select the degree of stroke for the car to swing.

Further, if the car for holding the baby is held by hand so that the car for holding the baby is not swung while the motor drive switch is in the ON state, the motor is unnecessarily energized. An excessive binding current flows through the coil, electric energy is likely to be wasted, and the motor may be overheated.

[0008]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and it is possible to move in one direction and then switch the moving direction to reverse the above-mentioned one direction. Direction, the switching direction is switched again and again, the swinging section is capable of repeating swinging in the one direction, a motor for driving the swinging section, and a rotation of the motor for the swinging section. And a driving voltage is supplied to the motor when the induced electromotive voltage becomes a predetermined value or more due to the rotation of the motor, and the induced electromotive voltage is restrained by the motor. And a motor control circuit that does not supply a drive voltage to the motor when the value becomes less than or equal to a predetermined value.

[0009]

According to the oscillating device constructed as described above, when the oscillating portion is manually oscillated, the movement of the oscillating portion in one direction or in the opposite direction is transmitted to the motor through the interlocking mechanism. As a result, the motor rotates, and thus an induced electromotive voltage of a predetermined value or more is generated in the motor. Therefore, the drive voltage is supplied to the motor, and the motor is rotationally driven. Therefore, since the rotational driving force of the motor is transmitted to the swinging unit via the interlocking mechanism, the swinging unit moves in one direction or the other direction while being accelerated by the driving force of the motor. At the time when the moving direction of the oscillating portion is switched, the oscillating portion is almost stopped temporarily, and therefore the motor is also almost stopped temporarily even during rotational driving. It is restrained and its induced electromotive force becomes equal to or lower than a predetermined value. Therefore, the drive voltage is not supplied to the motor, so that even when the motor is being rotationally driven, the rotational driving is reliably interrupted when the moving direction of the oscillating portion is switched.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to a swing will be described with reference to the drawings.

1 to 7 show an embodiment in which the present invention is applied to a swing. In addition, as shown in FIGS. 1 to 4, this rocking cradle includes a fixed frame 1. The fixed frame 1 includes a rectangular lower end portion 2, triangular side end portions 3a and 3b protruding upward in an inverted V shape from the left and right sides of the lower end portion 2, and these sides. It is composed of cylindrical bearing portions 4a and 4b fixed to the upper ends of the end portions 3a and 3b, respectively.

In the triangular opening 5 surrounded by the inner periphery of one side end 3a of the fixed frame 1, this side end 3a is formed.
A triangle-shaped mounting plate 6 having a substantially same shape as the inner periphery of is fitted and fixed. Then, the motor 7 and the battery storage box 8 are mounted on the mounting plate 6,
This battery storage box 8 has a battery E shown in FIG.
Is stored. Further, a part or all of the motor control circuit shown in FIG. 5 is housed in the case of the motor 7 and / or the battery housing box 8.

The cradle shown in FIGS. 1 to 4 has a swinging portion 11 having a basket for a baby. The swinging portion 11 includes a substantially rectangular parallelepiped car frame portion 12, and triangular hanging portions 13a and 13b projecting upward from both left and right sides of the car frame portion 12 in an inverted V shape. And a rotating shaft portion 14 continuously provided at the upper ends of the suspension portions 13a and 13b so as to project from the upper ends thereof to the left and right sides respectively.
a and 14b, and a box-shaped car portion 15 attached to the car frame portion 12. Further, since the rotating shaft portions 14a and 14b are rotatably fitted to the cylindrical bearing portions 4a and 4b, the swinging portion 11 includes the rotating shaft portion 14a.
It is rotatable in the front-rear direction (left-right direction in FIG. 2) about the axes of a and 14b.

At the tip of the rotating shaft portion 14a, a fan gear 16 is provided.
The center of rotation is fixed, and the pinion 18 is fixed to the rotating shaft 17 of the motor 7. The pinion 18 meshes with the fan gear 16. Therefore, rotation of the motor 7 in the forward direction and the reverse direction is performed by the rotation shaft 17 and the pinion 18
And is transmitted to the rotating shaft portion 14a via the fan gear 16, the swinging portion 11 is illustrated with the rotating shaft portions 14a and 14b as fulcrums as the motor 7 rotates in the forward and reverse directions. 2 rotates clockwise and counterclockwise, respectively.

FIG. 5 shows a motor control circuit for controlling the drive of the motor 7 used for the shaking shown in FIGS.

In FIG. 5, four drive transistors Q are provided.
12, Q22, Q32, Q42 are connected to form a bridge, and between the two bridge points A and B of this bridge,
The terminals T ₁ and T _{2 of the} motor 7 are connected to each other.
The motor 7 may be a well-known three-phase type DC motor. The armature circuit of the motor 7 is shown in FIG.
As shown in (A) to (C), two of the three Δ-connected coils L ₁ , L ₂ , and L ₃ are respectively connected to the three commutator pieces C ₁ , C ₂ , and C ₃ . It is configured by connecting. Further, each commutator piece C is rotated by the rotation of the motor 7.
Of the brushes B ₁ and B ₂ that sequentially contact _{1 to} C ₃ , B ₁ is connected to the terminal T ₁ , and the brush B ₂ is connected to the terminal T ₂ .

The drive transistors Q12 and Q32
Represents a forward drive transistor pair, and the drive transistors Q22 and Q42 form a reverse drive transistor pair. Then, the drive transistor Q12
Is a PNP type, and the collector and emitter of an NPN type forward rotation detecting transistor Q11 are directly connected in series to the base thereof. Also, this forward rotation detection transistor Q
The base of 11 is connected to the terminal T _{1 of the} motor 7 via the resistor R ₁ , and its emitter is connected to the terminal T _{2 of the} motor 7 via the resistor R ₂ .

These transistors Q11 and Q12 are
The connection is such that the ON state is self-maintained. That is, the armature (coil L ₁ ,
By L _2, L ₃ and commutator segments _{C 1, C 2, C 3} ) rotates in the forward direction by an external force, the Q11 induced electromotive force is generated by the forward rotation to the terminal T ₁ is turned on, its collector current Becomes the base current of Q12, and Q12 is also turned on. Therefore, the collector voltage of Q12 rises, the drive voltage for forward rotation is supplied to the motor 7, and the terminal T
_The drive transistor Q32, whose base is connected to ₁ via the resistor R _4, is also turned on. At this time, since the terminal T ₂ is almost at the ground potential, the transistors Q21, Q22 and Q42 are off. Therefore, the collector current of Q12 is supplied to the motor 7 via the terminal T ₁ and also to the base of Q11 via the resistor R ₁ . Therefore, the ON state of Q11 is maintained. Further, when Q32 is turned on, a voltage is supplied between the terminals T ₁ and T ₂ in the direction for rotating the armature of the motor 7 in the forward direction.

In the control circuit section for reverse rotation, the resistors R ₁ and R ₂ are also used as the emitter load resistance and the base resistance of the reverse rotation detection transistor Q21, respectively. Further, the terminal T ₂ and the base of the drive transistor Q42 are coupled via the resistor R ₃ .

Next, FIG. 1 to FIG. 6 configured as described above.
The action of the swinging shown in will be explained.

First, the car frame portion 12 or the suspension portions 13a and 13b of the swinging portion 11 stopped at the neutral position shown in FIG.
2 with the rotating shafts 14a and 14b as fulcrums.
2 is rotated forward in the direction of arrow Y and then released, the car frame 12, suspension parts 13a and 13b, and car 15 of the rocking part 11 are returned to the direction of arrow X in FIG. 2 by their own weight. Start moving. For this reason, since the rotating shaft portion 14a also rotates back, the fan-shaped gear 16 that rotates integrally with the rotating shaft portion 14a.
Also rotates back in the direction of arrow X in FIG. Therefore, the return rotation of the fan gear 16 causes the pinion 18 and the rotary shaft 17 to rotate.
Since the armature of the motor 7 that is integral with the rotating shaft 17 rotates in the forward direction via the
The electric potential of the terminal T ₁ rises.

The induced electromotive force E _n is proportional to the rotation speed N of the armature, and E _n = A · N (where A is a constant) holds. However, since the initial forward rotation of the swinging portion 11 in the direction of the arrow Y in FIG. 2 is extremely slow and slow, the reverse rotation detection transistor Q21 can be turned on by this forward rotation. The induced voltage that can be generated does not occur. On the other hand, as described above, the speed of the backward rotation of the oscillating portion 11 in the direction of the arrow X in FIG. 2, which is started by releasing the hand, is the same as that of the motion system including the oscillating portion 11 and the sector gear 16. Since the position of the center of gravity G rises as the position decreases,
The induced electromotive force E _{n at the} terminal T ₁ increases as the speed increases.

[0023] Then, the forward induced electromotive voltage E _n in terminal T ₁ based forward detecting transistor Q11 - exceeds emitter forward voltage V _BE1, the current through resistor R _1, R ₂ to the base of the Q11 is It flows and Q11 turns on. Therefore, the emitter base of the driving transistor Q12 → the collector-emitter of Q11 → the resistors R ₂ and R ₃
A current flows through the base of the drive transistor Q42 through the path of, and Q42 is turned on. Therefore, Q12 and Q4
Because the voltage at point A rises because both 2 are turned on,
The Q32 is turned on by base current to the driving transistor Q32 through a resistor R ₄ to flow. Therefore, the terminal T _{1 of the} motor 7 has a positive potential and the terminal T ₂ has a ground potential, so that the drive transistor Q42 is turned off.

When the emitter current of Q11 flows to the base of Q42 via the resistors R ₂ and R ₃ , the potential of the base of the reverse rotation detection transistor Q21 rises. However, at this time, the base potential of Q21 is based Q21 for induction electromotive voltage E _n by forward rotation of the terminal T ₁ - not possible to exceed the emitter forward voltage V _BE2, Q
21 is kept off.

Since it is as described above, the path through which the drive current of the motor 7 flows is from the battery E to the emitter of Q12.
Collector → point A → terminal T ₁ → motor 7 → terminal T ₂ → point B → collector-emitter of Q32 → battery E. At this time, since the armature of the motor 7 rotates in the normal direction, the rotation of the armature is caused by the rotation shaft 17, the pinion 18, and the fan gear 1.
The swinging portion 11 is continuously accelerated and rotated in the direction of arrow X via 6.

During the forward rotation of the armature of this motor 7,
This armature rotates as shown sequentially in FIGS. 6 (A)-(C). That is, at the rotational position shown in FIG. 9A, the series circuit of the coils L ₂ and L ₃ is in parallel with the coil L ₁ between the brushes B ₁ and B ₂ . Further, the rotational position of FIG. (B), a coil L ₁ and L ₂ coil L ₃ is short-circuited becomes parallel, further, the rotational position of FIG. (C), a coil L ₁ and L ₃ Is in parallel with the coil L ₂ . Therefore, at the rotational position shown in FIG.
The coil impedance between ₁ and B ₂ changes rapidly,
As shown in the waveform diagram of FIG. 7, the terminals T ₁ and T ₂ of the motor 7 are
A steep positive and negative pulse voltage (referred to as a reactance voltage) is generated by electromagnetic induction. Note that FIG.
The connection state of (B) is the polarity switching point (commutator pieces C ₁ , C ₂ ,
This pulse voltage is generated every 60 ° of rotation of the armature, since this connection state occurs 6 times per rotation of the armature (corresponding to the gap portion between C ₃ ).

Therefore, in FIG. 5, for example, Q1
1, Q12, when Q32 is motor 7 is turned on is forward rotation, based forward detecting transistor Q11 by a negative pulse generated between the terminals T _1, T ₂ -
Since the emitters are reverse-biased, these transistors Q11, Q12, Q32 momentarily turn off every 60 ° rotation of the motor 7. However, as long as the motor 7 is rotating at a speed equal to or higher than a certain value, the induced electromotive force E _n due to the forward rotation keeps the forward rotation control circuit unit in the ON state.

The negative pulse generated between the terminals T ₁ and T _{2 of} the motor 7 is also applied to the base-emitter of the reverse rotation detecting transistor Q21. However, since this negative pulse is absorbed by the capacitor C ₀ connected between the bases of the transistors Q11 and Q21,
Transistors Q21, Q22, Q42 are kept off.

As described above, the swinging portion 11 having returned to the direction of the arrow X in FIG. 2 beyond the neutral position shown in FIG.
The forward rotation in the direction of the arrow X causes the center of gravity G to rise accordingly, so that the rotation speed gradually decreases due to the own weight of the rocking portion 11, and therefore the normal rotation speed of the motor 7 is increased. Also decreases, and the induced electromotive force E _n due to the forward rotation also decreases. Then, the induced electromotive force E _n is the forward rotation detection transistor Q.
When the base-emitter forward voltage V _{BE1 of} 11 or less is reached, the negative pulse generated immediately after this turns off Q11 and Q12, the off state is maintained and the motor 7 is stopped. Therefore, the driving force of the motor 7 is not applied to the swing unit 11, so that the swing unit 11
After turning forward to an appropriate position, the arrow Y in FIG.
It starts to rotate back in the direction of. In this case, stoppers for restricting the final forward movement position are provided on the rotary shafts 14a and 14b so that the rotation direction of the swinging portion 11 is surely switched at the appropriate position (that is, the final forward movement position). May be.

When the swinging portion 11 is rotated back in the direction of arrow Y in FIG. 2, exactly the same operation is performed as when it is rotated back in the direction of arrow X.

That is, the backward rotation of the swinging portion 11 in the direction of the arrow Y in FIG. 2 turns on the reverse rotation control circuit portion instead of the forward rotation control circuit portion. The oscillating portion 11 is driven in the reverse direction to drive in the direction of arrow Y in FIG. Then, after the swinging portion 11 has rotated forward to the final forward movement position,
Due to its own weight, it starts to rotate again in the direction of arrow X in FIG.
Therefore, the swinging part 11 is continuously swung in the front-rear direction (left-right direction in FIG. 2) using the motor 7 as an auxiliary power source.

When it is desired to stop the rotation of the motor 7 and stop the swinging of the swinging portion 11, the swinging portion 11 is grasped by hand and the swinging is temporarily stopped, or the braking means is used. Is provided, and the rocking portion 11 is provided by this braking means
It is sufficient to temporarily stop the swinging of. In this case, as described above, the detection transistor Q is generated by the positive and negative pulses shown in FIG.
11 or Q21 and drive transistors Q12, Q3
When 2 or Q22, Q42 are turned off even momentarily, based induced electromotive voltage E _n is Q11 or Q21 - To is smaller than the emitter forward voltage V _BE1 or V _BE2, the OFF state is sustained, the Therefore, the forward rotation control circuit portion and the reverse rotation control circuit portion are kept in the off state until the swinging portion 11 is manually rotated again.

In the above embodiment, the motor 7
The rotation speed of the oscillating portion 11 which starts to rotate can be adjusted by adjusting the ratio of the rotation speed of the sector gear 16 and the rotation speed of the pinion 18. Therefore, by selecting the ratio of the radius of the pitch circle of the sector gear 16 and the radius of the pitch circle of the pinion 18 to an appropriate value, the motor 7
The rotation speed of the oscillating portion 11 which starts to rotate can be selected as an appropriate value.

FIG. 8 shows a motor control circuit in another embodiment in which the present invention is applied to a swing. It should be noted that this other embodiment may have the same configuration as that of the embodiment shown in FIGS. 1 to 7 except for the motor control circuit shown in FIG. Therefore, in FIG. 8, the same parts as those of the embodiment shown in FIGS. 1 to 7 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 8, Q31 is a rotation detecting transistor corresponding to the normal rotation detecting transistor Q11, and Q52 is a normal rotation driving transistor Q in FIG.
This is a drive transistor corresponding to 12. Also, R5
Is the emitter resistance of Q31 corresponding to the emitter resistance R2 in FIG.

Therefore, the motor control circuit shown in FIG. 8 only operates when the motor 7 rotates forward.
Rotation detection transistor Q31 which is turned on when the induced electromotive voltage exceeds a predetermined value due to rotation of the motor, and which is turned on when the rotation detection transistor Q31 is turned on to supply a drive voltage for positive rotation to the motor 7. And a drive transistor Q52 for
Is configured to be instantly turned off by a negative pulse generated in the armature coils L ₁ , L ₂ , L ₃ at each polarity switching point of the commutator of the motor 7. Therefore, in this embodiment, the rotation detection transistor Q31 and the drive transistor Q52 perform the same operations as the normal rotation detection transistor Q11 and the normal rotation drive transistor Q12 in the motor control circuit shown in FIG. 5, respectively. For this reason, the motor 7 is rotationally driven to drive the oscillating portion 11 only when the oscillating portion 11 rotates in the direction of the arrow X in FIG. At the time of turning in the direction of, it turns only by its own weight, not by the driving force of the motor 7.

If a coreless DC motor is used as the motor 7 in the above two embodiments, the rocking portion 11 can be swung in a natural state because there is no cogging torque, and the battery E is Even if the energy is lost, a large force that prevents the swinging portion 11 from swinging does not work, which is convenient.

Further, in the embodiment shown in FIGS. 1 to 7,
The motor 7 is configured to drive the oscillating portion 11 when the oscillating portion 11 is rotated in either of the directions of the arrow X and the arrow Y of FIG. There is no need to increase the torque so much. On the other hand, in the embodiment shown in FIG. 8, the swinging portion 11 in the direction of arrow X in FIG.
Since the motor 7 is configured to drive the oscillating portion 11 only when the motor is rotated, the torque of the motor 7 needs to be relatively large, but the configuration of the motor control circuit can be extremely simplified. it can.

Further, in the above-mentioned two embodiments, since the present invention is applied to the rocking, the rocking portion 11 is unidirectionally moved by its own weight with the horizontally extending rotary shaft portions 14a and 14b as fulcrums. It is configured to be movable in the opposite direction. However, the present invention can be applied to various rocking devices other than rocking, and in this case, the rocking portion is supported in one direction by spring pressure or the like with the pivot shaft portion extending in the vertical direction as a fulcrum and in the opposite direction. It may be configured to be movable in a direction. When the swinging portion is moved by the spring pressure, the car frame portion 12 and the car are shown in FIG. 2 (FIG. 2 is a side view in the above-mentioned embodiment, but in this case, a plan view). Coil springs are arranged on both sides of the swing portion main body corresponding to the portion 15, and the pair of coil springs operate in opposite directions in response to movement in one direction of the swing portion main body and in the opposite direction. The compression and repulsion can be repeated sequentially.

[0040]

According to the present invention, the oscillating portion is manually moved in one direction or the opposite direction,
The swing part can be driven by a motor to swing,
Since the motor can be stopped by temporarily stopping the swing of the swing unit manually, it is not necessary to manually turn on and off the motor drive switch.
For this reason, it is easy to swing the swinging portion using the driving force of the motor, or to stop the swinging by stopping the motor.

Further, the structure is simple because a limit switch for detecting the moving position of the swinging part is not required to switch the moving direction of the swinging part, and the structure is simple. It is also possible to appropriately adjust the stroke of movement of the oscillating portion if it is configured such that it can be adjusted with a device.

Further, if the swing is erroneously stopped by, for example, holding the swing portion in the swing state by hand, the drive voltage is not supplied to the motor, so that the motor is unnecessarily energized. Therefore, there is no risk of wasting electrical energy, and there is no risk of overheating of the motor due to an excessive binding current flowing in the coil of the motor as in the case where power is supplied unnecessarily.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment in which the present invention is applied to a swing.

2 is a side view of the swing shown in FIG. 1. FIG.

3 is an exploded perspective view of the swing shown in FIG. 1. FIG.

FIG. 4 is a perspective view of a support mechanism of a swinging shaft of the rocking swing shown in FIG.

5 is a circuit diagram of a motor control circuit used for the swing shown in FIG. 1. FIG.

6 is a circuit diagram of an armature circuit of the motor shown in FIG.

7 is a waveform diagram of the terminal voltage of the motor shown in FIG.

FIG. 8 is a circuit diagram showing another embodiment of the motor control circuit.

[Explanation of symbols]

7 Motor 11 Oscillating part 14a Rotating shaft part 14b Rotating shaft part 15 Cage part 16 Fan gear 18 Pinion Q11 Forward rotation detection transistor Q12, Q32 Forward rotation drive transistor pair Q21 Reverse rotation detection transistor Q22, Q42 Reverse rotation drive transistor pair Q31 rotation detecting transistor Q52 driving transistor C ₁ commutator segment C ₂ commutator segment C ₃ commutator segment L ₁ armature coil L ₂ armature coil L ₃ armature coils

Claims (7)

[Claims] 1. A swinging device capable of repeatedly swinging after moving in one direction, switching the moving direction, moving in the opposite direction to the one direction, switching the moving direction again, and moving in the one direction. Section, a motor for driving the oscillating section, an interlocking mechanism for transmitting the rotation of the motor to the oscillating section, and the induced electromotive voltage of which exceeds a predetermined value by the rotation of the motor. Supply a drive voltage to the motor when
An oscillating device comprising: a motor control circuit that does not supply a drive voltage to the motor when the induced electromotive force becomes equal to or less than a predetermined value due to the motor being constrained. 2. The interlocking mechanism is a fan gear directly or indirectly connected to a rotary shaft that rotatably supports the swing portion, and directly or indirectly to a rotary shaft of the motor. A pinion connected to and meshing with said fan gear. 3. The device according to claim 1, wherein the rocking device is a rocker, and the rocking part has a basket part for a baby. 4. The motor control circuit, when the motor rotates in one direction or in a direction opposite to the one direction, induces an induced electromotive voltage due to rotation of the motor. 4. The apparatus according to claim 1, 2 or 3, wherein the drive voltage is supplied to the motor when is above a predetermined value. 5. The motor control circuit comprises a forward rotation drive transistor pair arranged on one of opposite sides of the bridge, a reverse rotation drive transistor pair arranged on the other opposite side of the bridge, and a positive side of the motor. The forward rotation detection transistor that turns on when the induced electromotive voltage exceeds a predetermined value due to rotation and turns on the forward rotation drive transistor pair, and the induced electromotive voltage exceeds the predetermined value due to reverse rotation of the motor. And a reverse rotation detecting transistor for turning on the reverse rotation drive transistor pair when the motor is connected between two bridge points of the bridge, and the forward rotation and reverse rotation drive transistor pairs are When it is turned on, it is configured to supply a drive voltage for forward rotation and reverse rotation to the motor, and the forward rotation detection and reverse rotation detection transistors are The apparatus of claim 4, characterized in that it is configured to be instantaneously turned off by the pulse generated every polarity switching point of the motor of the commutator to the armature coils. 6. The motor control circuit induces the motor by the rotation of the motor only when the motor rotates in one direction or in the opposite direction to the one direction. 4. The device according to claim 1, wherein the device is configured to supply a drive voltage to the motor when the electromotive voltage exceeds a predetermined value. 7. The motor control circuit causes the induced electromotive voltage to be equal to or higher than a predetermined value by the rotation of the motor only when the motor rotates in either one of a forward rotation and a reverse rotation. A rotation detection transistor that is turned on when the rotation detection transistor is turned on, and a drive transistor that is turned on when the rotation detection transistor is turned on and supplies a drive voltage for the one rotation to the motor. 7. The device according to claim 6, wherein the transistor is configured to be instantly turned off by a pulse generated in the armature coil at each polarity switching point of the commutator of the motor.