JP2657197B2 - Coupled pendulum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupled pendulum for coupled vibration of two single pendulums.

[0002]

2. Description of the Related Art Conventionally, holding fulcrums of two simple pendulum systems are provided on the same member (a thread, a thin plate, a horizontal round bar, etc.), and both simple pendulums are connected by an elastic body such as a coil spring or a magnet. Is driven electromagnetically and the other single pendulum (passive side) is vibrated in conjunction with the vibration of the driving pendulum. For example, Japanese Utility Model Application Laid-Open No. Sho 58-114788 discloses 2
One single pendulum is provided on a propeller fixed at both ends, and one single pendulum is electromagnetically driven to perform pendulum motion, and the pendulum motion is transmitted to the other single pendulum via the propeller. In Japanese Utility Model Laid-Open Publication No. Sho 61-46494, two single pendulums which are respectively supported and suspended are provided with interlocking magnets to oppose each other, and one of the single pendulums is electromagnetically driven to perform a pendulum motion.
The structure which transmits this pendulum motion to the other simple pendulum via an interlocking magnet is shown.

[0003]

In the coupled pendulum, it is desirable that two single pendulums stably vibrate at the same swing angle and in opposite phases. Such vibrations mainly include the driving frequency of a single pendulum on the driving side, the natural frequency and resonance sharpness (Q value) of the single pendulum on the passive side, and the strength of coupling between these two vibration systems. Determined as a factor.

The swing angle of the passive single pendulum has the same characteristics as the resonance curve of a general resonance phenomenon, and is generally 1 Hz.
Since the Q value of a simple pendulum is about 200 to 1600,
It changes greatly due to a small state change (period, loss, etc.) of the passive single pendulum. That is, assuming that the cycle of the single pendulum on the driving side is 0.8 seconds and the Q value of the single pendulum on the passive side is about 400 and the swing angle when vibrating at a cycle of 0.8 seconds is 100%, the cycle, loss, etc. A small state change, for example, a cycle of 0.0
The swing angle changes to 70.
It drops to 7%.

In any of the above-mentioned conventional examples, the drive side and the passive side vibrate in opposite phases, and in order to make the swing angle the same value, the spring by the propeller or the magnet is weakened to weaken the coupling coupling. It is possible to make the natural frequency of the passive side very close to the frequency of the drive side, but it is the same that the swing angle of the passive side described above is easy to change, and the adjustment is extremely difficult. Things. When the coupling is strengthened by strengthening the spring, the coupled pendulum often undergoes coupled vibration at almost the same phase (a small phase difference is a certain degree) to be stable.

Thus, the swing angle of the single pendulum on the passive side is apt to change, the drive side and the driven side are likely to vibrate in substantially the same phase, and the coupling degree of coupled vibration is difficult to design and difficult to adjust. There are many problems such as points. In each of the above-mentioned conventional examples, the pendulum vibrates right and left, and a coupled pendulum vibrating back and forth is not shown.

Therefore, an object of the present invention is to make the swing angle of the pendulum on the passive side of the coupled pendulum that vibrates back and forth as large as that on the drive side, and to stably oscillate synchronously in antiphase. In addition, the purpose is to reduce the width and make the movement look complicated.

[0008]

To achieve the above object, a combined pendulum according to the present invention comprises a combined pendulum holding plate, a drive pendulum, a passive pendulum, a passive pendulum drive spring, and a swing. It comprises an abutting projection, a determining plate, and driving means for the above-mentioned drive-side pendulum. The drive side pendulum is suspended from both sides in the height direction of the coupled pendulum holding plate so as to be able to vibrate, and the passive side pendulum is suspended from the lower end side of the coupled pendulum holding plate so as to be able to vibrate. . The passive-side pendulum drive spring is provided at an intermediate portion between the suspension position of the drive-side pendulum on the coupled pendulum holding plate and the suspension position of the passive-side pendulum, and transmits the vibration of the drive-side pendulum to the passive-side pendulum. It is. The swinging projection is provided below the passive pendulum drive spring of the combined pendulum holding plate, and the determining plate is supported at the upper end of the combined pendulum holding plate at a predetermined distance behind the rear side of the combined pendulum holding plate. And a swinging projection can contact the lower end thereof. The drive means includes a drive magnet provided on the drive side pendulum and a drive coil provided opposite to the magnet.

[0009]

An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a pendulum mounting plate 2 is provided upright at the center of the bottom plate 1 in the depth direction. The center of the pendulum mounting plate 2 is an opening 2a where the coupled pendulum is located. A coupled pendulum holding plate 3 is provided in front of the upper end edge of the opening 2a.
Are connected by screws 3a or the like. As shown in FIGS. 2 and 3, the coupled pendulum holding plate 3 is made of a vertically long plate material having hard elasticity. The upper end portion is a holding fulcrum O, and the driving side pendulum 4 is provided on both sides of the intermediate portion in the height direction. Fulcrum P of
And the fulcrum Q of the passive pendulum 5 at the lower end. Let a be the drive-side fulcrum distance from the fulcrum O to the fulcrum P,
Let b be the passive fulcrum distance from the fulcrum O to the fulcrum Q. Between the fulcrum P of the drive side pendulum 4 and the fulcrum Q of the passive side pendulum 5, on the front and back of the coupled pendulum holding plate 3, opposed side pendulum drive springs 6, 6 are disposed and fixed to face each other. is there.

The drive side pendulum 4 is suspended at a fulcrum P in a swing-like manner by two suspending threads 4a, 4a parallel to each other. The suspension strings 4a pass through the gaps at both ends of the passive pendulum drive springs 6,6. The passive pendulum 5 is suspended at a fulcrum Q in a swinging manner by two suspension strings 5a, 5a parallel to each other.

As the driving means 7 for the driving-side pendulum 4, the magnet mounting plate 4b on the lower side of the suspension strings 4a of the driving-side pendulum 4 is provided.
A driving coil 7b is disposed at a position facing the driving magnet 7a on the inner end face of the lower end of the opening 2a.

In the passive pendulum 5, a weight 5c is provided on a weight mounting plate 5b on the lower side of the hanging strings 5a, 5a, and a decoration 8 is provided on the weight. The suspension thread 4a of the drive side pendulum 4
Weights 4c, 4c for the drive-side pendulum are provided outside 4a.

As shown in FIG. 2, the position of the center of gravity of the drive side pendulum 4 is R, the position of the center of gravity of the passive side pendulum 5 is S, the length of the drive side pendulum from P to R is m, and the passive side pendulum from Q to S is Let the pendulum length be n. The driving side pendulum weight 4c is suspended from the hanging thread 4a.
The drive side pendulum 4 is moved up and down along
Can be adjusted, and by displacing the weight 5c or the decoration 8 up and down along the hanging string 5a,
The center of gravity position S of the passive pendulum 5 can be adjusted.

As shown in FIG. 3, the coupled pendulum holding plate 3 has a passive pendulum driving spring 6 and a fulcrum Q of the passive pendulum 5.
The swinging projection 9 is provided so as to protrude from both sides.

On the back side of the coupled pendulum holding plate 3, a stabilizing plate 10 is provided at a predetermined distance d. The stabilizing plate 10 is a cantilevered spring fixed to the back surface of the pendulum mounting plate 2 at its upper end 10a, and the swinging projection 9 can contact the lower end 10b.

A clock 11 is attached to the pendulum mounting plate 2 via a clock mounting plate 11a on the upper front surface of the coupled pendulum thus constructed.

FIG. 3 is a side view showing the vibration state of the pendulum. The pendulum 4 on the driving side and the pendulum 5 on the passive side oscillate stably at the same pendulum angle and in opposite phases (phase synchronization). State. In order to synchronize the phases of the driving pendulum 4 and the passive pendulum 5, the frequency of the driving pendulum 4 is set lower than that of the passive pendulum 5. This frequency can be easily set by adjusting the position of the weight 4c, the weight 5c or the decoration 8 up and down, and adjusting the positions R and S of the centers of gravity of the driving pendulum 4 and the passive pendulum 5. Can be.

FIG. 4 shows a transient state of startup of the coupled pendulum of the present invention set as described above.

First, FIG. 4A shows an initial state in which the drive pendulum 4 is given an initial swing angle from the stationary state by the drive means 7 shown in FIG. . The passive pendulum 5 is still stationary.

When the pendulum 4 is released in this state, the amplitude gradually increases, and a force is applied to the coupled pendulum holding plate 3 from the hanging threads 4a, 4a via the passive pendulum drive spring 6, thereby retaining the coupled pendulum. The distal end portion of the plate 3 is bent, and the fulcrum Q of the passive pendulum 5 starts to be displaced, and the passive pendulum 5 also starts to vibrate.

If the driving pendulum 4 and the passive pendulum 5 start oscillating in the opposite phase during this swinging, the passive pendulum 4 and the passive pendulum 5 balance due to the balance between the force applied by the driving pendulum 4 and the force of the passive pendulum 5. The displacement of the fulcrum Q of No. 5 does not become so large, but remains only as shown in FIG. As described above, the frequency of the driving pendulum 4 is set to be slightly lower than that of the passive pendulum 5, so that the frequency decreases as the displacement of the fulcrum Q of the passive pendulum 5 increases. As the displacement of the fulcrum Q of the passive pendulum 5 gradually decreases with the continuation of the above, the frequency of the passive pendulum 5 becomes slightly higher than that at the start of the swing, and as shown in FIG. 4C and FIG. The passive pendulum 5 and the passive pendulum 5 oscillate stably at the same swing angle and in opposite phases (phase synchronization). In this operation, the swinging projection 9 and the degree determination plate 10 do not come into contact with each other, and stable vibration is started smoothly.

Next, as shown in FIG. 5 (a), when an initial swing angle is given to the drive side pendulum 4 and the passive side pendulum 5 swings out in phase, the drive side pendulum 4
Is added to the force of the passive pendulum 5, and the fulcrum Q of the passive pendulum 5 is displaced more. However, the swinging projection 9 comes into contact with the lower end 10b of the determining plate 10 to prevent the displacement of the fulcrum Q from increasing further. After a short period of time, the state of approaching the opposite phase begins to be approached. In this state, the force applied by the drive pendulum 4 and the force of the passive pendulum 5 are canceled out, the displacement of the fulcrum Q of the passive pendulum 5 decreases, and As the frequency of the side pendulum 5 increases, the increase in the phase delay decreases, and the side pendulum 5 vibrates in the opposite phase as shown in FIG. 5B.
After that, in the same way as moving from FIG. 4 (b) to (c),
FIG. 5 (c) in which the drive-side pendulum 4 and the passive-side pendulum 5 stably oscillate (phase-synchronized) at the same swing angle and in opposite phases.
State.

As described above, the driving pendulum 4 and the passive pendulum 5 have a synchronous pull-in action, and even when the pendulum swings out in the same phase, the swinging projection 9 comes into contact with the determining plate 10 to further increase the same. Since the phase vibration is prevented, the vibrations of the pendulums 4 and 5 are stabilized in opposite phases in a short time.

An important point in the present invention is that the phase is never stabilized in the same phase, but is stabilized in the opposite phase. This point
The above-mentioned conventional configuration is a remarkable difference from the extremely strict condition for phase synchronization that oscillates stably in the opposite phase.In the conventional configuration, it is stable in the same phase or stable in the opposite phase. Is determined by delicate start-up conditions and tends to be uncertain, and furthermore, the synchronization state is liable to change due to disturbance (such as acceleration or vibration during movement) on the coupled system. This change often stabilizes, in particular, from a desirable state of synchronizing in opposite phases to a state of in-phase synchronization, which is not desirable. On the other hand, in the present invention, even when the vibration is forcibly performed in the same phase at first, the vibration shifts to the anti-phase vibration in a short time and is stabilized.
Even if the same swing angle is given to the passive pendulum 5 in the same direction at the same time and released, the phase shifts to the phase synchronization oscillating in the opposite phase after the transient state described with reference to FIG.

[0026]

As described above, since the coupled pendulum according to the present invention is provided with the swinging projection and the determining plate, the passive pendulum of the coupled pendulum which vibrates back and forth regardless of the state of swinging. The swing angle of the pendulum is the same as that of the drive side pendulum, and it is possible to stably oscillate in synchronization with the opposite phase in a short time, and not only the width can be narrowed, but also the movement looks complicated and moves. Interest as a decoration increases, and the decoration effect can be enhanced.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of the present invention.

FIG. 2 is a front view of a coupled pendulum holding plate.

FIG. 3 is a side view showing a state where two pendulums of the coupled pendulum are oscillating stably in opposite phases.

FIGS. 4 (a), (b), and (c) are explanatory diagrams of a state from a start to a stable time when the coupled pendulum swings out of phase.

FIGS. 5A, 5B, and 5C are explanatory diagrams illustrating a state from a start-up time when the coupled pendulum swings out in the same phase to a stable time when the coupled pendulum vibrates in the opposite phase.

[Explanation of symbols]

 Reference Signs List 3 Coupled pendulum holding plate 4 Drive side pendulum 5 Passive side pendulum 6 Passive side pendulum drive spring 7 Driving means 7a Driving magnet 7b Driving coil 9 Swinging projection 10 ° determining plate Lower end

Claims (1)

(57) [Claims] 1. A coupled pendulum holding plate, a drive side pendulum,
A passive pendulum, a passive pendulum drive spring, a swinging projection, a stabilizing plate, and a driving means of the driving pendulum, wherein the driving pendulum is arranged in a height direction of the coupled pendulum holding plate. The passive pendulum is suspended from the lower end of the coupled pendulum holding plate, and the passive pendulum driving spring is coupled with the coupled pendulum. The drive unit is provided at an intermediate portion between a suspension position of the drive side pendulum and a suspension position of the passive side pendulum on the holding plate, and transmits vibration of the drive side pendulum to the passive side pendulum. The projection is provided below the passive pendulum drive spring of the combined pendulum holding plate, and the determining plate is separated from the back side of the combined pendulum holding plate by a predetermined distance at an upper end. Supported, and the lower end Kiga are possible contact, the drive means is coupled pendulum characterized by comprising a drive coil that is opposite to provided to the magnet and the drive magnet provided on the drive side pendulum.