JP2000075059A - Pendulum clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the period of a pendulum longer, and to miniaturize a pendulum clock by providing a magnet in a case, by providing another magnet at a position opposite to the magnet in the pendulum, and by allowing both the magnets to oppose each other in the same pole. SOLUTION: By a driving magnet being provided in a swing beam 31a and an electromagnetic coil 33b being provided in a case 10, a pendulum 31 rocks side to side by a specific angle with a pendulum support shaft 32a as a center. When the pendulum rocks from a left direction to a direction toward a rock center point A, a first magnet 33c being provided in the swing beam 31a and a second magnet 10a being provided in the case 10 are arranged while they oppose each other with the same polarity, thus allowing repulsion force to act on the first magnet 33c in a direction opposite to the rock direction of the pendulum when both the magnets approach. The amplitude of the pendulum is reduced by the repulsion force, and a phase delay is generated in a period. Also, after the center point A is passed, the repulsion force acts in the same direction as the rock direction in both the magnets, thus increasing the amplitude of the pendulum, generating the phase delay in the period of the pendulum, and hence extending the period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece having a pendulum, and more particularly to a structure for extending the period of a pendulum.

[0002]

2. Description of the Related Art Today, a pendulum clock having a pendulum is known in which the period of the pendulum is long and the pendulum is slowly swung. In such a pendulum clock, the pendulum period is lengthened by providing a pendulum support portion at a substantially middle portion of the pendulum and a weight at the upper end portion of the pendulum (for example, 55-98
384, Japanese Utility Model Publication No. 60-21985). In addition, in order to lengthen the period of the pendulum, the length from the pendulum support portion of the pendulum to the lower end of the pendulum is set to be long. It is common to lengthen the period of the pendulum by setting the distance from the pendulum support portion of the pendulum to the weight longer.

[0003]

In the above-mentioned conventional pendulum clock, there is a problem that the pendulum becomes large because the length of the pendulum becomes long in order to lengthen the period of the pendulum. Further, in order to lengthen the period of the pendulum, the one that makes the weight heavier has the problem that a large space is required for the operation of the weight.

Accordingly, the present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a small pendulum clock capable of extending the period of a pendulum.

[0005]

In order to solve the above-mentioned problems, a first magnet is provided in an eye housing, and a pendulum is provided with a first magnet at a position opposed to the first magnet. Two magnets were provided, and the first magnet and the second magnet were opposed with the same polarity.

According to another aspect of the present invention, a drive gear fixed to the pendulum support of the pendulum and rotating about the pendulum support, and rotatable about a support shaft provided on the housing. And a driven gear that meshes with the drive gear and suppresses the swing of the drive gear.

According to the first aspect of the invention, when the second magnet approaches the first magnet due to the swing of the pendulum, the repulsive force of the two magnets in the direction opposite to the swing direction of the pendulum. When the pendulum penetrates and passes through the swing center point A, the repulsive force of the two magnets acts in the same direction as the pendulum swinging direction.

Further, in the configuration according to the second aspect of the present invention, since the driven gear meshes with the drive gear and suppresses the swing of the drive gear, a phase delay occurs in the period of the pendulum, and the pendulum swings slowly. Will move.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first specific example of a pendulum timepiece according to the present invention will be described below with reference to FIGS.
1 is a front view of the pendulum clock, FIG. 2 is a cross-sectional view of the pendulum clock, FIG. 3 is a rear view of a main part of the pendulum, and FIG. 4 shows the operation of the pendulum. FIG. 5 is a diagram showing a state in which the pendulum goes rightward from the swing center point A. Pendulum clock 1 of the first specific example
The clock device 20 for displaying the current time by the hands 22 in the housing 10 and the pendulum device 30 are integrally incorporated. The clock device 20 is located above the housing 10 and the pendulum device. Reference numerals 30 are arranged on the lower side of the housing 10, respectively.

The housing 10 is provided with a dial window 11a made of a transparent plastic plate so that the dial 23 of the timepiece device 20 can be visually recognized from the outside. The operation of the pendulum 31 of the pendulum device 30 is provided below the window. So you can see it from the outside,
Similarly, a pendulum window 11b made of a transparent plastic plate is mounted. The housing is provided with a second magnet 10a at a position facing a swing ball described later.

The timepiece device 20 includes a movement 21 for driving a stepping motor based on a predetermined pulse signal to rotate a hand, a dial 23 disposed on the front side of the movement 21, and a dial for pointing. And a pointer 22 for displaying the current time.

The pendulum device 30 includes a pendulum 31, a pendulum supporting portion 32 for supporting the pendulum 31 inside the housing 10, and a pendulum driving portion 33 for continuously reciprocating the pendulum 31.
And a second magnet 34 arranged near a first magnet of the pendulum 31 described later. As shown in FIG. 2, the pendulum 31 has one end thereof supported by the pendulum support.
, A swing ball 31b attached to the other end of the swing rod 31a, and a first magnet 31c fixed below the swing ball 31b.

The pendulum support portion 32 is fixed to the back side of the housing 10. The pendulum support shaft 32a on which the pendulum rod 31a is pivotally supported and support holes (not shown) for supporting the pendulum support shaft 32a from both sides. The formed support shaft restricting portion 32
b. The pendulum support shaft 32a is inserted into a hole formed in the pendulum rod 31a.
Both ends of 2a have diameters reduced with respect to the hole diameter at the inserted position. A support hole having a predetermined clearance is formed in the support shaft restricting portion 32b so that the reduced diameter support shaft portions at both ends of the pendulum support shaft 32a can roll within a minimum range. The pendulum support shaft 32a can smoothly roll in the support hole.

The pendulum driving unit 33 includes a driving magnet 33a provided on the front side of the pendulum 31a and an electromagnetic coil 33b fixed to the back side of the housing 10 and having a surface facing one side of the driving magnet. It is configured. 1 and 2, both the drive magnet 33a and the electromagnetic coil 33b are arranged at positions that cannot be visually recognized from the housing 10. The electromagnetic coil 33b includes a power generation coil L2 that generates an induction current when the drive magnet 33a passes the front side of the electromagnetic coil 33b when the pendulum 31 swings, and a drive magnet that is generated by the induction current generated in the power generation coil L2. 3
The drive coil L1 that generates a magnetic force that opposes the magnetic force of 3a and urges the swing rod 31a is wound around one core.

Next, the operation of the pendulum will be described with reference to FIG. The pendulum 31 includes a driving magnet 33 a provided on a swing rod 31 a and an electromagnetic coil 3 provided on the housing 10.
3b swings the pendulum support shaft 32a left and right by a predetermined angle. When the pendulum swings in the direction from the left to the swing center point A as shown in FIG. 4, for example, the first magnet 33c provided on the swing rod 31a and the second magnet 33c provided on the housing 10 are provided. And the magnet 10a of the first magnet 33a are arranged opposite to each other with the same polarity.
A repulsive force acts on c in the direction opposite to the swinging direction of the pendulum. Therefore, due to this repulsive force, the amplitude of the pendulum decreases, a phase delay occurs in the period of the pendulum, and the pendulum operates slowly.

After passing through the swing center point A as shown in FIG. 5, a repulsive force acts on the two magnets in the same direction as the swing direction, so that the amplitude of the pendulum is amplified and the phase of the pendulum is increased in phase. A delay occurs and the period of the pendulum increases. That is, as shown in FIGS. 4 and 5, even when the pendulum moves from either the left or right, the amplitude of the pendulum decreases due to the repulsive force of both magnets before passing through the swing center point A, and a phase delay occurs in the period. After passing through the swing center point A, the repulsive force of the two magnets increases the amplitude and causes a position delay of the cycle, so that the cycle of the pendulum becomes longer and the pendulum swings slowly. Further, since only the first magnet and the second magnet are provided on the swing rod and the housing, respectively, the pendulum does not become large.

Next, a second specific example will be described with reference to FIG. Although not shown, the second specific example has a configuration in which a clock device that displays the current time using an hour hand and a minute hand and a pendulum device 30 are integrally incorporated, as in the first specific example. FIG. 6 is a main part rear view for explaining the pendulum device 30.

The pendulum device 30 is fixed to the pendulum 31, a pendulum supporting portion 32 for supporting the pendulum 31 inside the housing, a pendulum driving portion 33 for continuously reciprocating the pendulum 31, and a pendulum supporting portion 32. A drive gear 35 that rotates about the pendulum support 32 and a support shaft 3
The driven gear 36 is rotatably supported about the center 6a, meshes with the drive gear 35, and has a center of gravity higher than the support shaft 36a.
It is composed of The number of teeth of the driving gear 35 is set larger than the number of teeth of the driven gear 36.

As in the first embodiment, the pendulum drive unit 33 includes a drive magnet 33a provided on the front side of the swing rod 31a.
And an electromagnetic coil 33b fixed to the back surface of the housing 10 and having a surface facing one side surface of the drive magnet. A swing ball 31b is provided at a lower end side of the swing rod 31a, and a pendulum support portion 32 that rotatably supports the pendulum 31 inside the housing 10 is provided at an upper end portion.

In the driven gear 36, an arm 36b is fixed to the driven gear 36 so that the center of gravity is located higher than the support shaft 36a, and a weight 37 is fixed to a tip of the arm 36b. . That is, the weight 37 is arranged at one end of the arm 36b fixed to the driven gear 36, and the position of the weight 37 is set higher than the position of the support shaft 36a of the driven gear 36, so that the driven gear 36
5, the weight 37 is driven by the driving gear 35.
Is rotated in a direction opposite to the direction of rotation of the pendulum, the force by the weight 37 acts in the same direction as the swinging direction after passing through the swinging center point A of the pendulum. As a result, the period becomes longer, and the pendulum 31 swings slowly. When the pendulum 31 is stationary, that is, when the pendulum is positioned on a vertical line, the center of gravity is set to be positioned on the vertical line of the support shaft 36a to balance the left and right amplitudes of the pendulum.

That is, the number of teeth of the driving gear 35 is
Since the number of teeth of the driven gear 36 is larger than the angle of rotation of the drive gear 35, when the pendulum swings at a predetermined angle, the weight is set at an angle larger than the predetermined angle. Even if the arm 37b swings and the length of the arm 36b (the length from the support shaft 36a to the weight 37) is set to be short, or the size of the weight 37 is reduced, the weight 37 is effectively moved to the pendulum cycle. This causes a phase delay and allows the pendulum to swing slowly while keeping the weight small. According to this specific example, the swing of the drive gear 35 is suppressed by providing the weight 37 on the driven gear 36. However, the ends of the springs are fixed to the housing 10 and the driven gear 36, respectively. As a result, the swing of the drive gear 35 may be suppressed.

[0022]

As described above, according to the first aspect of the present invention,
According to this, when the second magnet approaches the first magnet due to the swing of the pendulum, the repulsive force of the two magnets acts in a direction opposite to the swing direction of the pendulum, and the swing center point A , The repulsive force of the two magnets acts in the same direction as the swinging direction of the pendulum, so that the pendulum cycle has a phase delay. Therefore, the period of the pendulum can be lengthened while keeping the pendulum small.

Further, according to the second aspect of the present invention, by providing the driven gear meshing with the drive gear and suppressing the swing of the drive gear, the period of the pendulum has a phase delay, and the pendulum is slowly moved. It will rock.

[Brief description of the drawings]

FIG. 1 is a front view of a pendulum clock according to a first specific example.

FIG. 2 is a sectional view of a pendulum clock according to a first specific example;

FIG. 3 is a rear view of a main part of the pendulum according to the first specific example;

FIG. 4 is a diagram showing the operation of the pendulum according to the first specific example, and showing a state where the pendulum is heading toward the swing center point A from the left.

FIG. 5 is a view showing the operation of the pendulum according to the first specific example, and showing a state in which the pendulum moves rightward from a swing center point A;

FIG. 6 is a rear view of a main part of a pendulum device according to a second specific example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 pendulum clock 10 housing 20 clock device 10a second magnet 30 pendulum device 31 pendulum 31a pendulum rod 31b pendulum ball 32 pendulum support 33a driving magnet 33b electromagnetic coil 33c first magnet 35 driving gear 36 driven gear 37 weight

Claims (2)

[Claims] 1. A pendulum clock comprising: a housing provided with an electromagnetic coil; and a pendulum supported by the housing so as to be swingable and provided with a drive magnet at a position facing the electromagnetic coil. A first magnet is provided on the pendulum, a second magnet is provided on the pendulum at a position facing the first magnet, and the first magnet and the second magnet are opposed to each other with the same polarity. A pendulum clock characterized by the following. 2. A pendulum clock comprising: a housing having an electromagnetic coil; and a pendulum supported by the housing to be swingable and having a driving magnet at a position facing the electromagnetic coil. A drive gear fixed to the pendulum support and rotating about the pendulum support; and a drive gear rotatably supported about a support shaft provided on the housing and meshed with the drive gear. A pendulum clock comprising: a driven gear that suppresses swinging of the pendulum.