JPH081470B2 - Rotating ornament drive - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary ornament drive device used in, for example, a table clock with a rotary ornament.

[0002]

2. Description of the Related Art A table clock with a rotary ornament is popular as a high-class table clock with enhanced decorativeness. The rotary ornament, which is the main element of the table clock with rotary ornament, is usually attached to a vertically arranged rotating shaft so as to be rotatable in the horizontal direction. As a mechanism for reciprocally rotating the rotary ornament, there are a mechanism using a balance spring and a mechanism using a motor.

As a first example, one using a balance spring applies the principle of a balance motor of a transistor timepiece to obtain reciprocating rotation in a rotary ornament, and a rotary shaft is provided so as to rotate via the balance spring to rotate. An ornament that moves in a gentle sine curve by this balance spring to give an elegant movement to the ornament (for example, Jitsuko Sho6).
0-21821).

When the balance spring is used as described above, the design and manufacture are troublesome, it is not suitable for mass production, the cost of parts is high, and the balance spring must be handled with great care. It is complicated. So the second
As an example of the above, the applicant of the present application, in Japanese Patent Application No. 3-43718, uses a step motor capable of forward / reverse rotation and draws a sine curve similar to the case of using a balance spring so that the rotary ornament moves. A method for controlling the drive timing of the step motor is proposed.

[0005]

What controls the ornament to move by drawing a sine curve similar to the case of using a balance spring by using the forward / reverse rotation motor described in the second example, is as follows. In order to obtain a smooth rotational movement of the ornament despite the step drive, a buffer member such as a coil spring is used in the transmission train wheel. In such a case, even if the pulse for driving the step motor is suddenly stopped, the coil spring that has been tightened is gradually released, and the force accumulated in the coil spring until then gradually spreads to the decoration, and the decoration It will rotate due to inertial force for a while. Therefore, even if a reverse pulse is suddenly output to change the rotation direction of the decoration, the rotation direction of the decoration is maintained by the inertial force. The inertial force received by the springs interferes with the movement of the ornament, making it awkward.

Therefore, an object of the present invention is to provide a drive device which can give a desired elegant rotary motion to a decoration even if it is constructed by using a buffer member such as a coil spring in the transmission train wheel. .

[0007]

In order to achieve the above-mentioned object, a drive device for a rotary ornament according to the present invention has a drive timing data of a step motor which can reciprocally drive the rotary ornament and which can be rotated normally and reversely. It is stored in the memory circuit, and based on this data, the operation of the step motor is controlled by the control circuit. The above data shows that the rotation speed of the rotary ornament changes sinusoidally. It is a numerical representation of the pulse interval of the operation pulse of the step motor, characterized in that a pulse blank portion of a certain section is provided before the rotation direction of the rotary ornament is switched.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The present invention simulates the operation timing of a step motor that drives a rotary ornament in order to give the output shaft a gradual speed change as if the rotary ornament reciprocally rotates through a balance spring. It was done. Therefore, a gentle speed change of the rotating decoration,
This will be described with reference to FIG. In FIG. 1, the rotary ornament 5 is
It is assumed that the front surface is located at the point P. This rotary ornament 5 rotates clockwise by an angle + θ1 and rotationally moves to a point P1, then reverses (rotates counterclockwise) from the point P1 and returns to the point P, and then the point P1 further rotates by an angle −θ1. It rotates clockwise and moves to point P2. In this way, the rotary ornament 5 makes a reciprocating rotary motion of one cycle, such as P → P1 → P → P2 → P ...

By changing the speed of the step motor along a cosine curve which changes in a predetermined cycle, the speed of the rotary ornament can be changed sinusoidally by the step motor.

As means for changing the speed as described above,
When the angular velocity ω of the rotary ornament is large, the interval d of the operation pulse of the step motor is set to a correspondingly dense interval, and when the angular velocity ω is small, the pulse interval d is set to a correspondingly sparse interval. You can do it (see Figure 2).

However, what controls the rotary ornament 5 to move by drawing a sine curve is a coil in the transmission train wheel which will be described later so that a smooth rotary motion of the ornament can be obtained despite the step drive. It is configured by using a cushioning member such as a spring. In this case, even if the pulse for driving the step motor is suddenly stopped, the coil spring that has been fastened is gradually released, and the ornament 5 will be rotated by inertial force for a while. Therefore, even if a reverse pulse is suddenly output to change the rotation direction of the decoration, the rotation direction of the decoration is maintained by the inertial force. The inertial force received by the springs interferes with the movement of the ornament, making it awkward.

As a means for solving such a problem, in the present invention, as shown in FIG. 3, a portion in which no pulse is output for a certain section B, that is, a pulse blank portion is provided before the rotation direction of the rotary ornament 5 is switched. ing. Therefore, when reaching the position immediately before this pulse blank portion (the position of point P3 or point P4 in FIG. 1), the coil spring that has been wound up until now is gradually released, and the ornament 5 becomes a step motor for a while. It rotates only by inertial force. The coil spring that was released by the rotation due to this inertia is wound again,
A pulse is adapted to be input to the step motor when this winding is completed. Therefore, there is no interference between the rotational driving force of the step motor and the inertial force received by the coil spring in the opposite direction, and when the reverse rotation is started, the coil spring is in a tightened state. The rotating ornament 5 makes an elegant rotating motion.

FIG. 4 is a block diagram of the circuit configuration of the present invention. The memory circuit 31 stores data for outputting the above-mentioned operation pulse and is connected to the control circuit 32. The control circuit 32 is capable of designating an address of the memory circuit 31 and reading the digitized pulse interval from the designated address via the data bus. Further, the control circuit 32 is connected to a clock circuit 32a for converting the pulse interval into a temporal element and a reset switch 32b for resetting the control circuit 32. The output from the control circuit 32 is provided separately for forward rotation (01) and reverse rotation (02), and is connected to a motor drive circuit 33 having an output buffer. Motor drive circuit 33
In the above, the pulse signals are connected to the step motor 9 according to the pulse intervals output from the control circuit 32.

When driving the rotary ornament 5, the control circuit 3
Reference numeral 2 designates the address of the storage circuit 31 corresponding to the start of the rotary decoration 5, reads the digitized pulse interval through the data bus, and the normal operation pulse from the control circuit 32 is sent to the motor drive circuit 33. Supplied. The step motor 9 is stepped by the forward rotation actuation pulse sent at the drive timing, and this rotation there from the rotor 12 to the gear 1.
When the gear 15 is rotated, the spring force is charged in the coil spring 18, and the coil spring 18 is charged with the spring force.
The disk 17 is rotated by the spring force charged to the rotary shaft 3, and the rotary shaft 3 is normally driven via the transmission shaft 16 and the drive gear 8. Since the rotation is transmitted via the coil spring 18 as described above, even if the gear 15 is intermittently stepped, the disc 1
7, the rotational torque transmitted to the drive gear 8 and the rotary shaft 3 is smoothed, and the rotary ornament 5 is smoothly driven in the normal direction.

In this way, the pulse signals of the drive timing corresponding to the rotation angle of the rotary decoration 5 are sequentially read out, the motor is driven in the forward direction to rotate the rotary decoration 5 forward, and only half of the maximum rotation angle is obtained. When the normal rotation is performed, the control circuit 32 supplies a reverse rotation operation pulse to the motor drive circuit 33 based on the next read data, and the rotary decoration 5 is rotated in the reverse rotation direction by the maximum rotation angle, and then again. It is inverted and driven to rotate in the forward direction by the maximum rotation angle. By repeating this, the rotary ornament 5 is reciprocally rotated.

Next, an example of a drive device for a rotary decoration in which the present invention is embodied will be described. As shown in FIGS. 5 and 6,
A rotating shaft 3 is rotatably supported by bearings 1a and 2a in an upright state in the gravity direction by an upper case 1 and a lower case 2. The rotary shaft 3 penetrates the center of the protrusion 4a of the middle plate 4, and the rotary ornament 5 is fixed to the protruding end of the upper case 1 from the upper side. In addition, the rotary shaft 3 between the upper case 1 and the middle plate 4
A bush 3a is fixedly attached to the bush 3a.
The permanent magnet 6 on the movable side is fixed to the. Middle plate protrusion 4a
The permanent magnet 7 on the fixed side facing the lower surface of the permanent magnet 6.
Is stuck. Both permanent magnets 6 and 7 are magnetized so as to repel each other at their opposing surfaces, and the magnetic force is
In the state where the rotary ornament 5 is attached to, the two permanent magnets are set so as to face each other with a predetermined gap without making contact with each other, and a magnetic levitation mechanism is configured.

A drive gear 8 is connected to the end of the rotary shaft 3 projecting downward from the middle plate 4 so as to be mutually non-rotatable and slidable in the axial direction. Rotational force from a step motor 9 as a drive source is transmitted to the drive gear 8. That is, the drive coil 11 is wound around one leg of the stator 10 having a substantially U shape, and the rotor 12 is provided in the gap at the tip of the stator 10.
Is rotatably supported by the lower case 2 and the middle plate 4.
The permanent magnet 13 fixed to the rotor 12 is
It is magnetically coupled to 0 and receives a rotational force.

A gear 14 meshes with the rotor pinion 12a, and a gear 15 meshes with the pinion 14a of this gear. Gear 1
The drive gear 8 is rotatably fitted to the transmission shaft 16, and the drive gear 8 meshes with a pinion 16a integrally formed with the transmission shaft, thereby forming a transmission train wheel from the step motor 9 to the drive gear 8. ing. The gear 15 and the transmission shaft 16 are rotatably supported by the lower case 2 and the middle plate 4.

The gear 15 is rotatably supported on the transmission shaft 16, but a disc 17 is press-fitted and fixed to the lower end of the transmission shaft 16 so that the gear 15 is held irremovably from the transmission shaft 16. There is. A coil spring 18 is interposed between the gear 15 and the disc 17, and the upper end of the coil spring is attached to the gear 15.
The lower ends are respectively locked to the disc 17.

On the lower surface of the gear 15, there is integrally formed a protrusion 15a that is closely opposed to the outer peripheral portion of the disc 17, and the outer peripheral portion of the disc 17 has a protrusion 17 that partially protrudes in the radial direction.
a is formed integrally. When the coil spring 18 is in a free state (neutral position), the projection 15a and the projection 17a are at 180 ° opposite positions. Protrusion 15a
And the projection 17a do not engage during normal operation,
It engages when the coil spring 18 is excessively tightened or loosened, and acts to prevent the coil spring 18 from being damaged.

The lock lever 20 is rotatably supported by a protrusion 2b protruding from the lower case 2 in the vicinity of the permanent magnets 6 and 7, and has a concentric arc-shaped click arm 20a and an inclination extending in the radial direction. A planar locking arm 20b,
A projection 20c protruding on the upper surface of the locking arm and a reset arm 20d extending outward are integrally formed. The locking arm 20b can enter between the permanent magnets 6 and 7, and the inclined surface of the locking arm 20b allows the movable permanent magnet 6 to be moved.
Can be lifted up.

A printed circuit board 21 is arranged below the reset arm 20d, and both ends of the drive coil 11 are connected to predetermined positions. The control circuit 32 described in FIG.
The spring piece 22 constituting the reset switch 32b for resetting the
It is attached at a position facing the tip of the. Further, the click pin 19 is provided on the printed circuit board 21 so that the click arm 20a can move over the click pin 19.

The portion excluding the magnetic levitation mechanism as described above is the step motor 9 and the transmission train wheel from this motor. The train wheel is formed between the lower case 2 and the middle plate 4, and is formed thinly. However, the portion of the magnetic levitation mechanism including the permanent magnets 6 and 7 becomes thicker in the vertical direction of FIG. 2 than in the train wheel portion. Therefore, the upper case 1 is formed with a protrusion 1b in a predetermined range around the rotary shaft 3, and a magnetic levitation mechanism such as permanent magnets 6 and 7 is housed in a space 1c formed by the protrusion 1b. are doing.

Assuming that the maximum rotation angle of the rotary ornament is 2 · θ1, the angular velocity ω of the rotary ornament is the front position of the rotary ornament (see FIG. 1).
Point P), that is, when the rotation angle is θ1, it is maximum, and when it is at both left and right end positions (points P1, P2 in FIG. 1), it is minimum. Therefore, when the angular velocity ω is maximum, the pulse interval d of the operating pulse is set to the minimum interval dmin, and when the angular velocity ω is minimum, the pulse interval d of the operating pulse is set to the maximum interval dmax, and the interval is gradually decreased from dmax to dmin. , Dmin to dmax, the interval is gradually increased. At this time, before the rotation direction of the rotary ornament 5 is switched, a portion that does not output a pulse for a certain section B, that is, a pulse blank portion is provided (see FIG. 3).

Therefore, when the pulse spring reaches immediately before the pulse blank portion, the coil spring 18 which has been wound up until now is gradually released, and the force accumulated in the coil spring 18 until then gradually spreads to the decoration 5. For a while, the ornament 5 is rotated only by the inertial force, not by the step motor 9. The coil spring 18 unwound by the rotation due to this inertia is wound again, and when the winding is completed, a pulse is input to the step motor. Therefore, the rotation driving force by the step motor,
The inertial force received by the coil spring in the opposite direction does not interfere, and when the reverse rotation is started, the coil spring is in a tightened state, and the rotary ornament 5
Makes an elegant rolling movement.

When driving the rotary ornament 5, the control circuit 3
Reference numeral 2 designates the address of the storage circuit 31 corresponding to the start of the rotary decoration 5, reads the digitized pulse interval through the data bus, and the normal operation pulse from the control circuit 32 is sent to the motor drive circuit 33. Supplied. The step motor 9 is stepped by the forward rotation actuation pulse sent at the drive timing, and this rotation there from the rotor 12 to the gear 1.
When the gear 15 is rotated, the spring force is charged in the coil spring 18, and the coil spring 18 is charged with the spring force.
The disk 17 is rotated by the spring force charged to the rotary shaft 3, and the rotary shaft 3 is normally driven via the transmission shaft 16 and the drive gear 8. Since the rotation is transmitted via the coil spring 18 as described above, even if the gear 15 is intermittently stepped, the disc 1
7, the rotational torque transmitted to the drive gear 8 and the rotary shaft 3 is smoothed, and the rotary ornament 5 is smoothly driven in the normal direction.

[0027]

As described above, according to the present invention, the so-called pulse blank portion is provided which does not output a pulse for a certain section before the rotation direction of the rotary ornament is switched. , The coil spring that had been wound up until now is gradually released, the force accumulated in the coil spring until then gradually spreads to the ornament, and the ornament rotates for a while only by the inertial force without using the step motor. Therefore, the rotating ornament 5 makes an elegant rotating motion. Moreover, it is possible to give a reciprocating rotation that changes the speed in a sinusoidal manner to the rotary ornament without using the conventional balance type drive that requires a balance spring, and to provide a product (for example, a watch) that uses the rotary ornament at a low price. can do.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a relationship between a rotary ornament and a rotation angle thereof.

FIG. 2 is a waveform diagram of a conventional operation pulse.

FIG. 3 is a waveform diagram of an actuation pulse of the present invention.

FIG. 4 is a block diagram of a circuit configuration.

FIG. 5 is a vertical cross-sectional view of a main part showing a specific configuration.

FIG. 6 is a cross-sectional plan view of the main part of the above.

[Explanation of symbols]

 5 Rotating decoration 9 Step motor 31 Memory circuit 32 Control circuit

Claims (1)

[Claims] 1. A forward / reverse rotatable step motor for reciprocally driving a rotary ornament, a storage circuit for storing drive timing data of the step motor, and data stored in the storage circuit. And a control circuit for controlling the operation of the step motor, based on the above, the data digitizes the pulse interval of the operation pulse of the step motor so that the rotation speed of the rotary decoration changes sinusoidally A drive device for a rotary ornament, characterized in that it has a pulse blank portion of a certain section before the rotation direction of the rotary ornament is switched.