JPS6030793Y2 - Motor-driven bell striking mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bell striking mechanism that converts the rotational motion of a motor into reciprocating motion.

In the conventional well-known electromagnetic attraction type bell, as shown in FIG. A diaphragm 5 having fixed ends is rotatably supported.

A contact 4a is formed at the tip of the plate spring 4, and a contact 3a is formed at the tip of the fixed contact base 3.

Then, one end of the coil 2b wound around the bobbin 2 is pulled out to form one lead wire 6, and the other end is connected to the base end of the plate spring, and the other end is connected to the base end of the fixed contact base 3. The leader line 7 is drawn out.

Further, the base end of a hammer 8 is fixed to the tip of the diaphragm 5, and is inserted into the insertion hole of the yoke 1. A spring 9 is interposed in the hammer 8, and one end of the spring 9 is connected to the base end of the hammer 8. It is fixed in the insertion hole.

A gong 10 is placed at a predetermined distance from the hammer 8.
is installed.

When a DC voltage is applied to the lead wire 6.7 of the bell configured as described above, a current flows to the lead wire 7 through the lead wire 6, the coil 2b, the plate spring contact 4a, and the fixed contact base contact 3a.

At this time, an attractive force acts on the iron core 2a and the diaphragm 5 is attracted, so that the hammer 8 overcomes the elastic force of the spring 9 and strikes the gong 10.

At the same time, since the contacts 3a and 4a are separated, the current is cut off and the attractive force of the iron core 2b is lost, and the diaphragm 5 returns to its original position due to the elastic force of the spring 9, so the contacts 3a and 4a are separated again.
A and 4a come into contact and a current flows between them, and this operation is repeated, producing the sound of a bell.

However, in the above-mentioned bell, the number of points the hammer 8 hits the gong 10, which plays an important role in determining the volume of the bell, the strength of the plate spring 4, the weight of the hammer 8, and the weight of the spring 9 are important factors. There is a problem in that it is difficult to arbitrarily obtain the number of dots per unit time because it is affected by many constants such as the spring constant.

Furthermore, since the contacts 3a and 4a separate quickly, there is a problem in that it is difficult to arbitrarily determine the stroke of the hammer 8.

Therefore, even if it is possible to experimentally determine the number of strikes of the hammer 8 that produces the maximum sound and the stroke value of the hammer 8, the above-mentioned problems still exist, so a bell having the optimum number of strikes and stroke can be mechanically created. There were drawbacks such as the difficulty of

This idea was developed in view of the above circumstances, and involves pulling a leaf spring with a hammer disposed near its free end by a coil spring engaged with a crank member, thereby converting the rotational motion of the motor into reciprocating motion of the hammer. To provide a motor-driven bell striking mechanism which is configured to strike a gong, has a simple configuration, and can easily set the number of striking points and stroke of a hammer.

An embodiment of this invention will be described below with reference to FIGS. 2 to 6.

FIG. 2 is a front view showing one embodiment of a motor-driven bell striking mechanism, and FIG. 3 is a side view thereof.

Reference numeral 11 in the figure indicates a motor, and a rotating shaft 12 of this motor 11 is provided with a crank member 14 eccentrically formed integrally with a disc 13.

The motor 11 is fixed to a motor mounting plate 16 formed by cutting out and raising a part of the mounting plate main body 15.

On the other hand, one end of the leaf spring 18 is fixed to the leaf spring mounting plate 17, which is similarly cut out, with eyelets 19, 19, etc.
The other end is a free end.

A hammer 20 for striking a gong (not shown) is disposed near this free end.

Thus, the crank member 14 and the free end of the leaf spring 18 are engaged with each other by the coil spring 21.

In the embodiment shown in FIGS. 2 and 3, the crank member 14 is designed so that the coil spring 21 is inserted through and engaged with the through hole 22, but as shown in FIGS. It is also possible to provide a drum-shaped crank member 14a integrally formed eccentrically with the crank member 13, and to engage the coil spring 21 by hooking the crank member 14a to the crank member 14a.

The engagement state between the crank member 14 and the coil spring 21 is such that the coil spring 21 is loosely hooked on the crank member 14, so that the rotational motion of the crank member 14 and the reciprocating motion of the coil spring 21 are smoothly converted. It has become.

Note that the same reference numerals in the drawings refer to the same components shown in FIGS. 2 and 3.

Furthermore, in order to attach the striking mechanism having the above structure to a gong, as shown in FIG.
It is fixed at

The hammer 20 is configured to strike the side wall of the gong 24.

Next, the operation of the striking mechanism of the motor-driven bell will be explained.

When the motor 11 is energized, the rotating shaft 12 rotates, and the crank member 14 attached to the rotating shaft 12 rotates around the rotating shaft 12, giving the coil spring 21 reciprocating motion.

Since the other end of the coil spring 21 is engaged with the free end of the leaf spring 18, the reciprocating motion is transmitted to the leaf spring 18 as well, and the hammer 20 hits the gong 24 to generate a sound.

The coil spring 21 and the leaf spring 18 have the function of absorbing the impact to some extent when the hammer 20 strikes the gong 24, and maintaining the state in which the hammer 20 strikes the gong 24 for a predetermined period of time to increase the sound volume of the bell. This is what we do.

This effect is not so effective when the leaf spring 18 is used alone, but is synergistically enhanced by the coil spring 21.

Furthermore, when the hammer 20 is moving in the direction of striking the gong 24, force is further applied to this movement by the elastic forces of the coil spring 21 and the leaf spring 18, thereby further lengthening the stroke of the hammer 20.

As explained above, the motor-driven bell striking mechanism of this invention consists of a motor, a crank member attached to the rotating shaft of the motor, one end of which is fixed, the other end free, and a hammer. Although it has an extremely simple structure that converts the rotational motion of the motor into reciprocating motion of the hammer by using a coil spring that engages the crank member and the leaf spring with each other, the following is achieved. It has great effects like.

(b) By changing the rotational speed of the motor, the number of points the hammer strikes the gong can be arbitrarily controlled, and therefore the number of points can be set to a value that provides the maximum volume.

(b) By selecting the spring constants of the leaf spring and coil spring, the time that the hammer is in contact with the gong (this time can be longer by using both the leaf spring and the coil spring than by using either one). .

) can be set optimally.

(c) By installing a plate spring and a coil spring, the striking stroke of the hammer can be lengthened.

In addition, excessive torque when the hammer strikes the gong is applied via the spring, which has a buffering effect that saves power and reduces power consumption.
It is also effective for mechanical life.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional electromagnetic attraction bell, Fig. 2 is a front view showing an embodiment of the striking mechanism of the motor-driven bell of this invention, Fig. 3 is a side view of the same, Figs. FIG. 5 is a front view and a plan view showing another embodiment of the crank member, and FIG. 6 is a sectional view showing the crank member attached to a gong. 11... Motor, 12... Rotating shaft, 14... Crank member, 18... Leaf spring, 20... Hammer, 21. ...Coil spring.

Claims (1)

[Scope of utility model registration request] A motor, a crank member provided on the rotating shaft of the motor, a leaf spring having one end fixed and the other free end and a hammer disposed near the free end, and one side engaged with the crank member. and a coil spring whose other end is engaged with the free end of the leaf spring.