JPH081468B2 - 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). In this example, in order to stop the movement of the rotary ornament, annular permanent magnets are provided oppositely to the rotary shaft and the base plate, and a lock lever is provided so that the permanent magnets can enter the gap between the permanent magnets. There is one (for example, Japanese Utility Model Publication No. 60-21817) in which a vertical locking force is applied to stop the movement. Further, there is one in which a locking pin is provided on the above-mentioned lock lever so as to prevent the balancespring from being damaged by abutting against the balance when locked (for example, Japanese Utility Model Publication No. 60-39828).

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 rotary ornament to move by drawing a sine curve similar to the case of using a balance spring using the forward / reverse rotation motor described in the second example. , No means for temporarily stopping the movement of the rotary ornament. Therefore, if the lock lever shown in the first example is used, the rotary ornament can be stopped, but the drive signal continues to be sent to the motor even during the stop, and the current flows unnecessarily to the motor. Inconvenience, and when the lock is released and the motion of the rotary ornament is restarted, the drive signal and the motion of the rotary ornament cannot be synchronized, and the desired elegant motion cannot be obtained. Cause

Therefore, an object of the present invention is to make it possible to temporarily stop the motion of the rotary decoration, and at the same time to stop the output of the drive signal when the motion of the rotary decoration is stopped, the motor is always driven. This is to ensure that the drive signal and the movement of the rotary ornament can be synchronized.

[0007]

In order to achieve the above object, in a drive device for a rotary ornament according to the present invention, a rotary shaft to which the rotary ornament is fixed penetrates an intermediate plate to form an upper case and a lower case. , Is rotatably supported in a standing state in the direction of gravity, and the drive gear is connected to the protruding end portion of the rotating shaft downward from the middle plate so that the drive gear is relatively unrotatable and slidable in the axial direction. A movable permanent magnet is fixed between the upper case of the rotating shaft and the middle plate, and a fixed permanent magnet that faces the lower surface of the movable permanent magnet and magnetically reciprocates on the upper surface of the middle plate. A magnet wheel is fixed, and a transmission train wheel that transmits a rotational force from a forward / reverse rotatable step motor that reciprocally drives a rotary ornament to a drive gear is rotatably supported by the middle plate and the lower case. A lock lever is swingably supported in the vicinity of both permanent magnets, and a locking arm that moves into the gap between the permanent magnets and raises the movable permanent magnet to prevent the rotation shaft from rotating is provided on the lock lever. And a reset arm for resetting the circuit that supplies the drive signal to the step motor.

Further, one gear in the transmission train wheel is rotatably supported by the transmission shaft, and is transmitted through a coil spring interposed between the disc and the disc fixed to the transmission shaft. The rotation is transmitted to.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a rotating shaft 3 is rotatably supported by bearings 1a and 2a by an upper case 1 and a lower case 2 in a standing state in the gravity direction. 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.
A bush 3a is fixed to the rotary shaft 3 between the upper case 1 and the middle plate 4, and a movable permanent magnet 6 is fixed to the bush 3a. A fixed permanent magnet 7 is fixed to the protrusion 4a of the intermediate plate so as to face the lower surface of the permanent magnet 6. Both permanent magnets 6 and 7 are magnetized so as to repel each other on their opposing surfaces, and the magnetic force is applied to the rotating shaft 3 by the rotating ornament 5.
In a state in which is attached, both permanent magnets are set so as to face each other with a predetermined gap without coming into contact with each other, thereby configuring a magnetic levitation mechanism.

A drive gear 8 is connected to the end of the rotary shaft 3 protruding downward from the middle plate 4 so as not to rotate and to slide 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.

The gear 14 is meshed with the rotor pinion 12a, and the gear 15 is meshed 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.

As mentioned above, the gear 15 has a transmission shaft 16
Although it is rotatably supported on the transmission shaft 16, a disc 17 is press-fitted and fixed to the lower end portion of the transmission shaft 16 so that the gear 15 is attached.
It is held irremovably. A coil spring 18 is interposed between the gear 15 and the disk 17, and the upper end of the coil spring is locked to the gear 15 and the lower end is locked to the disk 17.

On the lower surface of the gear 15, there is integrally formed a protrusion 15a that closely faces and faces 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 projection 2b projecting from the lower case 2 in the vicinity of the permanent magnets 6 and 7, and has a concentric arcuate 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 thereof can lift the movable permanent magnet 6 upward.

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.

As described above, the portion excluding the magnetic levitation mechanism 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.

Since the rotary ornament of the present invention has a gentle speed change as if it reciprocally rotates through a balance spring, the step motor 9 is provided with such a speed change. Is supplied with an operating pulse having a waveform as shown in FIG. When the rotating ornament reciprocally rotates from the front position to the left and right by a uniform rotation angle, assuming that the maximum rotation angle is θmax, the angular velocity of the rotating ornament is when the rotating ornament is in the front position, that is, the rotation angle θmax / 2. Is the maximum, and is the minimum at both left and right ends, that is, when the rotation angle is 0 and θmax. Therefore, when the angular velocity is maximum, the pulse interval of the operating pulse is set to the minimum interval dmin, and when the angular velocity is minimum, the pulse interval of the operating pulse is set to the maximum interval dmax, and the interval is gradually decreased from dmax to dmin, and from dmin to dmax. Gradually increase the interval.

FIG. 4 is a block diagram of the circuit configuration of the present invention, in which 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 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.

When it is desired to temporarily stop the driving of the rotary ornament 5, the lock lever 20 is swung counterclockwise as shown in FIG. Due to this swing, the click lever 20a gets over the click pin 19, and the locking arm 20b
Enters between the permanent magnets 6 and 7, and as shown in FIG. 6, the rotating shaft 3 is lifted upward through the permanent magnet 6 as it enters, the bush 3a abuts the upper case 1 and the protrusion 20c is formed. By making contact with the lower surface of the permanent magnet 6, the rotation of the rotary shaft 3 is blocked by the frictional force between the two, so that the rotary ornament 5 stops its movement.

The lock lever 20 does not press the spring piece 22 as shown in FIG. 7 in the state where it is not swinging (see FIG. 1), and therefore the spring piece 22 is separated from the printed circuit board 21 and is controlled. Since the circuit 32 is in the set state,
As described above, the control circuit 32 outputs the actuation pulse of the step motor 9, and the rotary ornament 5 is reciprocally rotated as described above. However, the lock lever 20 is oscillated as described above ( In FIG. 5), as shown in FIG. 8, the reset arm 20d moves toward the tip of the spring piece 22 and presses the spring piece 22. Therefore, the spring piece 22
Makes elastic contact with the printed circuit board 21.
Is reset and the drive of the rotary ornament 5 is stopped,
No operating pulse is output from the control circuit 32 to the step motor 9, and no rotational force is transmitted from the motor 9.

Next, when the rotary ornament 5 is driven again, the lock lever 20 is swung clockwise. At the same time when the rotary shaft 3 is released, the control circuit 32 is set. When the rotary shaft 3 is released from the lock, if the spring force charged in the coil spring 18 remains when the rotary shaft 3 is stopped, the spring force is transmitted via the disc 17, the transmission shaft 16, and the drive gear 8 to the rotary shaft 3. 3, the rotary shaft 3 rotates until the coil spring 18 reaches the neutral position and stops. Then, by the control circuit 32 reset,
Similarly to the above, the drive data of the rotary decoration 5 is read from the storage circuit 31, and the step motor 9 is controlled to drive the rotary decoration 5 in the same manner as above. For this reason, the posture of the rotary ornament 5 and the drive data are always synchronized, and a desired elegant rotary motion can be obtained.

[0024]

As described above, the lock lever of the present invention prevents the rotation of the rotary shaft by entering between the pair of permanent magnets for magnetic levitation and lifting the movable permanent magnet upward. There are a locking arm and a protrusion that operate and a reset arm that extends on the spring piece on the printed circuit board and resets the circuit that supplies the drive signal. Therefore, when the rotary decoration is stopped, the circuit is reset at the same time and the set state is set again. Then, a drive signal synchronized with the movement of the rotary ornament is given, and the desired elegant movement of the rotary ornament is always obtained.

If the rotation is transmitted to the drive gear through the gear having the coil spring, a smooth motion of the rotary ornament can be obtained despite the step drive, which gives a high-class feeling when used for a timepiece or the like. It can be further enhanced.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a main part showing an embodiment of the present invention.

FIG. 2 is a developed sectional view of a main part of the same.

FIG. 3 is a waveform diagram of an operating pulse.

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

FIG. 5 is a cross-sectional plan view of a main part in a locked state.

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

FIG. 7 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 8 is an enlarged sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 1 Upper Case 2 Lower Case 3 Rotating Shaft 4 Middle Plate 5 Rotating Decorative 6 Movable Permanent Magnet 7 Fixed Permanent Magnet 8 Drive Gear 9 Step Motor 12, 14, 15, 16 Transmission Wheel Train 20 Lock Lever 20b Locking Arm 20d Reset arm 32 circuits

Claims (2)

[Claims] 1. A rotary shaft to which a rotary decoration is fixed is rotatably rotatably supported by an upper case and a lower case so as to stand upright in the direction of gravity through the intermediate plate. The drive gear is relatively non-rotatably and slidably connected in the axial direction to the end projecting downwardly from the upper case and the middle plate of the rotary shaft. A magnet is fixed, a fixed permanent magnet facing the lower surface of the movable permanent magnet and magnetically reciprocating is fixed to the upper surface of the intermediate plate, and a positive reciprocating drive of the rotary ornament is performed. The transmission wheel train that transmits the rotational force from the reversely rotatable step motor to the drive gear is rotatably supported by the middle plate and the lower case, and the lock lever swings near both permanent magnets. It is movably supported and the lock lever has the permanent magnet. A locking arm for entering the space between them to raise the movable-side permanent magnet to prevent rotation of the rotary shaft, and a reset arm for resetting a circuit for supplying a drive signal to the step motor are provided. A drive device for a rotating decoration characterized by: 2. The transmission train according to claim 1, wherein
The two gears are rotatably supported by the transmission shaft, and transmit the rotation to the transmission shaft via a coil spring interposed between the disc fixed to the transmission shaft and the disc. The drive device of the characteristic rotary decoration.