JPH0419599Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electromagnetic bell-ringing device used in alarm clocks and the like.

[Prior Art] An example of an electromagnetic bell-ringing device used in alarm clocks and the like is disclosed in Japanese Patent Publication No. 57-35478.

This uses the magnetic force that acts between the magnetic core (iron core) inserted in the electromagnet and the permanent magnet attached to the center of the shimoku to attract or repel the permanent magnet, and attaches it to the tip of the shimoku. The ball is used to strike the bell.

[Problem to be solved] The electromagnetic bell-striking device described in the above-mentioned Japanese Patent Publication No. 57-35478 only responds to the magnetic force (attractive force or repulsive force) acting between the magnetic core (iron core) and the permanent magnet. The electromagnet needed to generate a strong magnetic field to perform the bell-strike operation. Therefore, a large amount of current had to be passed through the electromagnet coil, and a large electromagnet was required.

The purpose of the present invention is to reduce the current consumption of an electromagnet used in an electromagnetic bell-striking device and downsize it by effectively utilizing the spring force of the bell-striking device to perform a bell-striking operation.

[Means for Solving the Problems] The electromagnetic bell striking device of the present invention is capable of striking a bell by the spring force of the bell when no magnetic force acts between the magnetic core of the electromagnet and the permanent magnet attached to the bell. When the bell member is in elastic contact with the ring and the excitation coil of the electromagnet is in a non-excited state, the magnetic force acting between the magnetic core and the permanent magnet positions the bell striking member so that it is out of contact with the ring. When the excitation coil is in an excited state, the magnetic core and the permanent magnet are in a repulsive relationship, and the repulsive force acting between the magnetic core and the permanent magnet and the spring force of the shock are applied in the same direction. The bell member is designed to strike a ring.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the electromagnetic bell striking device, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a detailed view of the bell striking device.

In FIG. 1, 1 is a phosphorus fixed to the tip of a phosphorus support plate 2 by welding or the like;
Pillar 3 on case 3 made of plastic etc.
It is fixed by screwing to a.

8 is an excitation coil wound around a coil bobbin 8a;
9 is a yoke made of a magnetic material; 10 is a magnetic core made of a magnetic material, inserted into the center of the coil, and movable in the axial direction by screwing with the yoke 9; 9 and 10 constitute an electromagnet. The electromagnet is screwed to the case 3 by a collar 9a provided on the yoke.

As shown in FIG. 3, the reference numeral 4 is a shimoku made of a thin plate having spring properties. A bell striking member 5 for striking the ring 1, that is, a striking ball is fixed to the tip of the ring 4. A permanent magnet 6 is fixed to a position of the magnet 4 facing the magnetic core 10. The permanent magnet 6 is made of urethane or the like to absorb the shock so as not to damage the permanent magnet 6 when the shock 4 vibrates and collides with the magnetic core 10, and to reduce the noise at the time of the collision. A buffer member 7 is attached.

As shown in FIG. 2, the magnet 4 is screwed to the pillar 3b on the case 3 so that the axes of the magnetic core 10 and the permanent magnet 6 coincide, so that it can vibrate in the vertical direction as shown in FIG. . Further, the permanent magnet 6 is magnetized in the vibration direction of the magnet 4, for example, in FIG. 1, the upper side is the N pole and the lower side is the S pole. Assuming that the coil 8 is not energized and the magnetic core 10 is not inserted, that is, no external force is applied to the permanent magnet 6, and the ring 1 is removed, Fig. As shown by the dashed line, the tip of the bell striking member 5 is positioned so as to be slightly above the lower side surface of the ring 1. That is,
Assuming that the coil 8 is not energized and the magnetic core 10 is not inserted, that is, no external force is applied to the permanent magnet 6 and the ring 1 is attached, then the The spring force causes the bell striking member 5 to come into elastic contact with the ring 1. Therefore, the striking relationship between the ring 1 and the bell striking member 5 can be maintained reliably. On the other hand, in actual use, by adjusting the magnetic core 10 and inserting it to an appropriate position, the magnet 4 is bent by the attractive force acting between the magnetic core 10 and the permanent magnet 6, as shown by the solid line in FIG. As shown, the tip of the bell striking member 5 and the ring 1,
The permanent magnet 6 and the magnetic core 10 are configured to be balanced with appropriate spacing between them. 3c is a hole for attaching this electromagnetic bell striking device to a watch case or the like.

Next, the operation of changing the bell-beating pattern using the electromagnetic bell-beating device will be explained.

FIG. 4 shows a circuit block diagram for driving the electromagnetic bell striking device constructed as described above, and FIG. 5 shows an example of the driving waveform. Now, to simplify the explanation, a case will be described in which four types of bell-strike patterns are sequentially switched and output every 8 seconds.

In FIG. 4, 12 is a crystal oscillator, 13 is a frequency dividing circuit that divides the signal from the crystal oscillator 12, and 1
4 is a clock circuit. The clock circuit 14 may be analog or digital, but since this is not the purpose of this application, a description thereof will be omitted.

15 is a first pulse train generation circuit that decodes a plurality of frequencies from the frequency dividing circuit 13 and generates a plurality of pulse trains; in the embodiment, P1 to P1 in FIG.
Generate P4 waveform. P1 and P2 are each 0.5 seconds,
Valid level for 16ms every 0.25 seconds (hereinafter, valid level is referred to as H level and invalid level as L level).
is the signal, and P3 is only 0.5 seconds every second.
The signal outputting 32Hz, P4, is a continuous signal of 32Hz.

Reference numeral 16 denotes a second pulse generating circuit which is triggered by a signal Sa which goes to H level when the alarm time arrives and goes to L level by ringing stop means (not shown), as shown in Fig. 5 a1 to a4. The H level is output sequentially every 8 seconds. Note that the waveform a4 may be maintained at the H level while the signal Sa is at the H level, that is, until the ringing stop operation is performed, as shown by the dotted line in FIG.

17 is a waveform switching circuit, when a1 is at H level, P1, when a2 is at H level, P2, a
When a.3 is at H level, P3 is output from output terminal 0, and when a4 is at H level, P4 is output from output terminal 0.

18 is a transistor, and the waveform switching circuit 1
When output 0 of 7 is at H level, it is ON, and when it is at L level, it is OFF. 11 is the electromagnetic bell striking device shown in FIG. 8 is the above-mentioned excitation coil;
When energized, the permanent magnet side of the magnetic core 10 and the permanent magnet 6
It is assumed that the magnetic core sides of the two are connected so that they have the same polarity.

Now, when the alarm time arrives, since a1 is at H level for the first 8 seconds, waveform P1 is output from output 0 of waveform switching circuit 17, and when P1 is at H level, transistor 18 is turned on.
Excitation coil 8 and transistor 18 from power supply V
A current flows through it, energizing the electromagnet.

As mentioned above, since the magnetic core 10 has the same polarity as the permanent magnet 6, the permanent magnet 6 receives a repulsive force, and the drum 4 is moved upward by the repulsive force and its own spring force, and the bell striking member 5 rings Rin 1.

When P1 goes to L level, transistor 18 becomes
OFF, the electromagnet is no longer excited, so the permanent magnet 6 is attracted to the magnetic core 10, and the striking member 5 is energized by the ring 1.
move away from Therefore, for the first 8 seconds, the bell is struck at a 2Hz cycle according to the P1 waveform. Similarly, from the output of the waveform switching circuit 17, P2, P3, P
4 waveforms are sequentially output every 8 seconds, and ring 1 is struck according to the waveforms. Therefore, by changing the waveforms of P1 to P4 so that the bell is struck slowly at first and gradually becomes faster, the sound can be made to gradually become audible. Moreover, the current flowing through the excitation coil 8 is as follows:
Only when the waveforms of P1 to P4 are at H level,
Overall current consumption is reduced.

In addition, the frequency characteristics and sound pressure of the above vibration system change depending on the distance between the phosphor and the vibration and the permanent magnet and the magnetic core, so by moving the magnetic core, these distances can be optimized. It is possible to adjust it accordingly.

Further, the bell striking pattern is not limited to the above-described one, and any number of types may be used, and the length of the switching time may also be set freely.

[Effect] The electromagnetic bell-striking device of the present invention performs the bell-striking operation by applying the repulsive force caused by the magnetic force acting between the magnetic core of the electromagnet and the permanent magnet and the spring force of Shumoku itself in the same direction. This is how it was done.
Because spring force is also applied when the bell is struck, the current flowing through the electromagnetic coil can be significantly reduced compared to conventional systems. Therefore, it is also possible to downsize the electromagnet.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is a detailed view of the ring, and Fig. 4 is the drive of the electromagnetic bell striking device shown in Fig. 1. The block diagram of the circuit, FIG. 5, is a time chart of the drive waveform shown in FIG. 1... Phosphorus, 4... Shumoku, 5... Bell striking member, 6... Permanent magnet, 8... Excitation coil, 10...
...Magnetic core.

Claims (1)

[Scope of Claim for Utility Model Registration] An excitation coil that generates a magnetic field when energized, a magnetic core made of a magnetic material and located within the excitation coil, a shimoku that has spring properties and has one end fixed, and the shimoku as well. a bell-striking member fixed to the other end; a permanent magnet fixed to the drum so as to face the tip of the magnetic core; and a ring struck by the bell-striking member in response to vibrations of the drum. When no magnetic force acts between the magnetic core and the permanent magnet, the striking member comes into elastic contact with the ring due to the spring force of the magnetic shaft, and when the excitation coil is in a non-excited state, The striking member is positioned so as not to come into contact with the ring due to the magnetic force acting between the magnetic core and the permanent magnet, and when the excitation coil is in an excited state, the magnetic core and the permanent magnet are in contact with each other. are in a repulsive relationship, and the repulsive force acting between the magnetic core and the permanent magnet and the spring force of the shutter are made to work in the same direction, so that the bell striking member strikes the ring. Type bell striking device.