JPH0350558Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a buzzer used as a sound source for alarm devices, security devices, etc. Regarding motor buzzers.

[Prior art]

In recent years, a motor buzzer has been developed in which a polygonal cam is attached to the motor shaft, and the rotation of this cam causes a leaf spring to vibrate, and a hammer attached to the leaf spring hits a sounding plate to generate a buzzer sound. ing.

By the way, since conventional motor buzzers of this type use a single cam, the buzzer sound generated is monotonous, and in order to change the pitch, the cam must be replaced with one of a different pitch. However, there is a problem in that it is difficult to replace such a cam in the field.

[Purpose of invention]

Therefore, an object of this invention is to provide a motor buzzer that can easily change the pitch of the buzzer sound and can emit a relatively wide variety of buzzer sounds.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a motor buzzer which is an embodiment of this invention. In this figure, the case 1 of the buzzer body is a rectangular case made of aluminum, for example, with the front side (lower side in the figure) closed and the back side (upper side in the figure) open, and the front side has many holes 2 for passing sound. is drilled. A frame 5 made of aluminum is fixed to the front inner side of the case 1 to support a sounding plate 3 and a mounting plate 4, which will be described later. A plurality of pins 6, 6, . The sound plate 3 is a square plate made of metal such as aluminum alloy, and its center protrudes rearward (upward in the figure) in a convex shape. Further, holes 6a, 6a, . . . , through which the pins 6 are inserted, and holes 7a, 7a, .
The mounting plate 4 is formed by punching a metal plate such as iron, and the portion extending into the opening 8 formed approximately in the center thereof is bent toward the back side (upward in the figure). A support portion 10 for supporting the leaf spring 9
is formed. On the back side of this support part 10 there are 2
Hollow book pins 11, 11 are provided protrudingly. Further, holes 6b, 6b, . . . through which the pins 6, 6, . . . penetrate, and holes 7b, 7b, . Furthermore, rectangular holes 19a to 19d for attaching a motor 15, which will be described later, are formed in a part of one wide side 4a of the mounting plate 4. Then, the sounding plate 3 and the mounting plate 4 are sequentially stacked on the frame 5, and then each pin 6 is stacked on the frame 5.
It is fixed to this mounting plate by crushing the tip.

The leaf spring 9 is made of stainless steel, for example, and has a wide center and base end. This plate spring 9 has holes 11a and 11 at its base end.
a are formed, and the pins 11, 11 are inserted into these holes and then fixed to the support portion 10 by crushing their tips. A hole 12a for attaching a hammer 12 is formed in the center of the leaf spring 9. The hammer 12 is made of plastic, for example, and has a small diameter at its base end. The hammer 12 is fixed to the leaf spring 9 by sequentially inserting the base end into the hole 12a and the washer 13, and then heating and crushing the base end. Also, this leaf spring 9
A protruding strip 14 extending in the width direction is formed by bending at the tip.

15 is a DC motor, and this motor 15 is housed in a plastic case 16 and mounted on the mounting plate 4.
Fixed. The motor shaft of this motor 15 is provided with a pentagonal cam 20a and a square cam 20b, respectively. As is clear from FIGS. 3 to 6, the plastic case 16 has a cylindrical shape with both end edges extending inward and divided into two semi-cylindrical parts 16a and 16b by a plane passing through the axis. These two semi-cylindrical parts 16a, 16
b is connected at the upper part by a hinge member 17. Furthermore, two mounting pieces 18 having claws on the outside are provided at the lower ends of both semi-cylindrical parts 16a and 16b.
a and 18b are respectively attached. In this case, the mounting pieces 18a, 18a form one pair, and the mounting pieces 18b, 18b form the other pair. This plastic case 16 houses the motor 15 therein, and the mounting pieces 18a, 18
a into the hole 19a and the mounting pieces 18b, 18b into the hole 19c (cam 2
0a) or mounting piece 18a, 1
It is fixed to the mounting plate 4 by fitting the mounting pieces 8a into the holes 19b and the mounting pieces 18b and 18b into the holes 19d (when using the cam 20b).

Returning to FIG. 1 again, what is indicated by the reference numeral 21 is:
A presser member 21 is provided to restrict the amplitude of vibration of the leaf spring 9 near the hammer 12 and at the same time press the plastic case 16. The presser member 21 is attached to the mounting plate 4 using screws or the like. The screw 22 is for regulating the amplitude of the above-mentioned leaf spring 9, and the buzzer volume can be adjusted by moving this screw in and out.

In this embodiment, the frame 5 and the pin 6 have been described as being made of aluminum or the like, but they are made of resin such as plastic, and the tips of these are heated when attaching the sound plate 3 and the mounting plate 4. It may be crushed. When the plastic frame 5 is used in this way, the buzzer sound becomes softer. Further, the protruding portion 14 of the leaf spring 9 may be formed by fixing a convex member to a flat leaf spring instead of using the bending process.

According to the above configuration, the motor 15 is connected to the hole 19
a, 19c, the diaphragm 9 will be attached to the cam 2.
Since the diaphragm 9 is vibrated by the cam 20b, a relatively high buzzer sound can be obtained because the motor 15 is mounted using the holes 19b and 19d. can get.
Moreover, replacing the motor 15 in the width direction as described above is extremely easy and can be done on site.

In addition, in the above embodiment, the plastic cover 1
6, two pairs of mounting pieces 18a, 18a, 18b, 18
b and four holes 19a to 1 in the mounting plate 4.
9c is provided, thereby making it possible to select two axial mounting positions of the motor 15. However, the configuration in which the motor 15 is mounted movably in the axial direction is not limited to the above configuration. The cam may be moved to three or more locations, and the number of cams may be increased accordingly. Furthermore, the method of attaching the motor 15 is not limited to the above-mentioned method, and of course, a method such as screwing may also be used. Further, while the position of the motor 15 is fixed, the support part 10 of the mounting plate 4 is formed wide as shown in FIG. 7, and two sets of screw holes 30a, 30a, 30b, 30b are formed in this support part. However, the same effect can be obtained by fixing the leaf spring 9 to the support portion using the screw holes 30a, 30a or the screw holes 30b, 30b so that the leaf spring 9 can be moved in the axial direction of the motor 15. .

Next, FIG. 2 shows another embodiment of this invention. The leaf spring 9 in this embodiment is composed of a first leaf spring 9a and a second leaf spring 9b whose base ends are connected and extend parallel to each other. The distance between the leaf springs 9a and 9b is such that each protrusion 14a, 14b of these leaf springs has a cam 20a, 20b.
The values are such that they are in contact with each other. Although not shown, the mounting plate 4 in this embodiment includes the following:
Only holes 19a and 19c are formed, and the motor 15 is attached using these holes.

According to this embodiment, the leaf springs 9a, 9b are vibrated by the cams 20a, 20b of different pitches, so that the sound plate 3 is vibrated by the hammers 12a, 12b.
Since the cam is struck at different frequencies by the cam, it is possible to emit a wide variety of buzzer sounds compared to a buzzer using a single cam.

[Effect of the invention] As is clear from the above explanation, the motor buzzer according to this invention includes a plate spring whose base end is fixed and a hammer is attached to the tip, and the hammer is struck by the vibration of the plate spring. with a pronounced pronunciation body,
In the motor buzzer that vibrates the plate spring, the motor buzzer includes a plurality of polygonal cams having mutually different pitches, which are attached to a motor shaft of a motor at a predetermined distance in the axial direction of the motor shaft. Buzzer sounds of different pitches can be selected because the motor position setting means is provided for setting the position of the motor so that the tip end of the motor is biased in the direction of the cam against the outer peripheral part of each of the cams. It also makes it possible to generate a wide variety of buzzer sounds compared to a motor buzzer using a single cam.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one embodiment of this invention, Fig. 2 is a perspective view of main parts of another embodiment of this invention, and Figs. 3 to 6 are of the embodiment shown in Fig. 1. 3 is a plan view, FIG. 4 is a front view, FIG. 5 is a bottom view, FIG. 6 is a sectional view taken along line A-A in FIG. 5, and FIG. 7 is a sectional view of the plastic case 16. 2 is a perspective view showing another example of the configuration of the mounting plate 4 in FIG. 1. FIG. 3... Sound plate, 9... Leaf spring, 12... Hammer, 14... Projection, 15... Motor, 16...
Plastic case, 19a to 19d...hole (1
6, 19a to 19d are motor position setting means), 2
0a, 20b...cam.

Claims (1)

[Scope of utility model registration request] a leaf spring having a fixed base end and a hammer attached to a tip end; a sounding body against which the hammer is struck by the vibration of the leaf spring; In a motor buzzer comprising a plurality of polygonal cams having different pitches, which are attached at a predetermined distance in the axial direction of the motor shaft, the tip of the leaf spring is in contact with the outer periphery of each of the cams. A motor buzzer comprising a motor position setting means for setting the position of the motor so as to urge the motor in a cam direction.