JPH056498U - Electromagnetic bell drive - Google Patents

Abstract

(57) [Summary] [Purpose] Increase the amplitude so that you can see the movement well,
An object of the present invention is to provide an inexpensive electromagnetic bell drive device that prevents excessive deformation of the movable piece when dropped or impacted. According to the electromagnetic bell driving device of the present invention, a substantially U-shaped yoke 4 having one end 1b of an iron core 1 around which a coil 3 is wound is fixed to the bottom, and a corner of the upper side of the yoke 4. A movable piece 6 having one end 6a fixed near the corner, a permanent magnet 7 provided on the movable piece and facing the iron core 1, and a yoke 6 fixed to the other end 6b of the movable piece 6. Mounting member 8 provided with an arm portion 8a engageable with the end portion 4c of 4, a bell 10 swingably held by a mounting shaft 8h protruding from the mounting member 8, and a mounting member 8 It is detachably attached to the bell 10
It is characterized in that it comprises a locking member 9 for preventing the separation of the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic bell drive device.

[0002]

[Prior Art]

 BACKGROUND ART There has been known a belling device in which a bell is arranged at the tip of a vibrating shrimp (Japanese Utility Model Publication No. 51-46358).

[0003]

[Problems to be solved by the device]

 However, in the above conventional technology, the cost of the device is high because the motor is used. Also, because the motor rotates quickly, the bell moves so fast that it is not possible to enjoy it.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic bell-driving device which is low in cost and allows the bell to move smoothly.

[0005]

[Means for Solving the Problems]

 The electromagnetic bell drive device of the present invention has a substantially U-shaped yoke in which one end of an iron core around which a coil is wound is fixed to the bottom, and one end near the corner of the upper side of the yoke. A movable piece that is fixed, a permanent magnet that is provided on the movable piece and faces the iron core, and an arm that is fixed to the other end of the movable piece and that is engageable with the end of the yoke. A mounting member provided with a bell, a bell swingably held by a mounting shaft projecting from the mounting member, and a locking member detachably mounted on the mounting member to prevent the bell from coming off. It is characterized by

[0006]

[Action]

 When the application and removal of the drive voltage to the coil is repeated, the permanent magnet is repelled and attracted by the iron core, and vibrates up and down with one end of the movable piece fixed to the fixed portion of the yoke as a fulcrum. Since the distance between the bell and the fulcrum is formed to be larger than the distance between the permanent magnet and the fulcrum, the bell vibrates vertically with a larger amplitude than the amount of vertical vibration of the permanent magnet. At the time of impact such as transportation and drop, the upper surface of the yoke and the lower surface of the mounting member come into contact with each other, or the end of the yoke and the inside of the arm come into contact with each other, and the movable piece is not excessively deformed.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a pair of coil frames 2 and 2 are fixed to both ends of an iron core 1, and a coil 3 is wound around the iron core 1. One end 1a of the iron core 1 is fixed to the bottom side of the yoke 4 having a substantially U-shape, and the bottom end of the yoke 4 hangs downward and is fixed to the fixing member 5 by screwing. .. A fixed portion 4a is integrally erected near the corners of the upper side of the yoke 4, and one end portion 6a of a thin movable plate 6 made of an elastic member is fixed to the fixed portion by caulking, welding or the like. As described later, the one end 6a serves as a fulcrum when the movable piece 6 vertically vibrates.

A permanent magnet 7 is fixed to the lower part of the center of the movable piece 6. The permanent magnet 7 is fitted into a hole 4b formed in the yoke 4 and faces the other end 1b of the iron core 1. The movable piece 6 is connected to the mounting member 8, and a pair of substantially L-shaped arm portions 8a, 8a hang down on both sides of the mounting member 8 so as to engage with the end portion 4c of the yoke 4. Is provided.

As shown in FIGS. 2 to 4, a pair of rectangular holes 8c and 8c are provided in the plate-shaped portion 8b of the mounting member 8. The pair of rectangular holes 8c, 8c are provided with overhanging portions 8d, 8d (see FIG. 4) extending from the outer lower portions toward the center. The plate portion 8b and the overhanging portion 8d form a flat engagement groove 8e (see FIG. 4) in which the other end portion 6b of the movable piece 6 can be inserted in the axial direction. A protrusion 8f is provided at the center of the lower surface of the plate-shaped portion 8b.

The tip of the mounting member 8 has a substantially semicircular shape (see FIG. 4) having an arc at the top, and a mounting hole 8g is formed inside the tip. A cylindrical mounting shaft 8h is provided so as to project from the inside of the tip portion toward the inside of the mounting hole 8g. A thin portion 8i having a reduced thickness in the width direction is formed at the front end of the mounting shaft 8h, and the mounting portion 10a of the bell 10 described later can be easily inserted into the thin portion 8i. Recesses 8j, 8j (see FIG. 3) are formed on both lower sides of the mounting hole 8g.

As shown in FIG. 5, the locking member 9 is made of an elastic member such as plastic and is detachably attached to the mounting hole 8 g of the mounting member 8. The cross section of the locking member 9 has an inverted U shape, and the lower part can be bent inward. At the lower part of each of the pair of side parts 9a, 9a of the locking member 9, there is provided an outwardly projecting locking claw 9c having an inclined part 9b inclined downward, and at the central part thereof. A brim portion 9d protruding outward is provided. An abutting portion 9e is provided at the central portion on the front surface side of the side portion 9a.

In order to lock the locking member 9 in the mounting hole 8g, the contact portions 9e and 9e are made to face the mounting shaft 8h, and the mounting hole 8g and the inclined portions 9b and 9b are brought into contact with each other to lock the locking member 9 When is pushed down from above, the inclined portions 9b, 9b are bent inward by the outside of the mounting hole 8g, and the locking claw 9c penetrates the mounting hole 8g. In this state, the upper side surface of the mounting hole 8g and the lower surfaces of the brim portions 9d, 9d are in contact with each other, and the locking claw 9c is opened to the recess 8j so that the recess 8j and the locking claw 9c are engaged with each other.

As shown in FIGS. 6 and 7, a locking hole 6c is provided in the vicinity of the other end 6b of the movable piece 6. Further, the other end 6b of the movable piece 6 is inserted through the pair of flat locking grooves 8e, 8e, and the locking hole 6c is locked by the projection 8f so that the mounting member 8 is prevented from moving outward. Regulated.

The bell 10 is provided with a substantially ring-shaped mounting portion 10a. The mounting portion 10a of the bell 10 is swingably fitted and held on the mounting shaft 8h, and the locking member 9 is located at the tip of the mounting shaft 8h. Therefore, the bell 10 is located far away from the one end 6a of the movable piece 6 fixed to the yoke 4. The abutting portion 9e faces the mounting portion 10a so as to be able to come into contact therewith, and allows the bell 10 to move by a predetermined amount S in the axial direction and prevents the bell 10 from being detached from the mounting shaft 8h. The recess 8j of the mounting member 8 is engaged with the locking claw 9e, and restricts the locking member 9 from moving upward.

The inner diameter of the mounting portion 10a is formed slightly larger than that of the mounting shaft 8h, and the bell 10 is swingably held by the mounting member 8.

Next, the operation will be described. When a driving voltage is applied to both ends of the coil 3, the iron core 1 is excited and an N pole is formed at the other end 1b. Therefore, when the driving voltage is applied to both ends of the coil 3 for the time T1 as shown in FIG. 8, the permanent magnet 7 receives a repulsive force, and the movable piece 6 moves upward as shown by the imaginary line in FIG. Along with this, the mounting member 8 moves upward and the bell 10 also moves upward. Next, when the drive voltage is removed for the time T2, the iron core 1 is demagnetized and the movable piece 6 returns to its original position.

Since the bell 10 is attached to the other end 6b of the movable piece 6 via the attachment member 8, the distance from the bell 10 to the one end 6a of the movable piece 6 serving as a fulcrum is equal to that of the permanent magnet 7 and one end. It is formed to be larger than the distance from the portion 6a. Therefore, the vertical movement amplitude of the bell 10 becomes larger in proportion to the distance from the fulcrum than the vertical movement amplitude caused by the magnetic action between the permanent magnet 7 and the iron core 1 by the lever principle. .. Further, since the mounting portion 10a has a gap S with respect to the mounting shaft 8h, the movement of the bell 10 is further increased. Therefore, the movement of the bell 10 can be seen clearly.

Since the bell 10 is driven at time T1, the timing of the driving voltage V1 and the times T1 and T2 for applying and removing the driving voltage are properly adjusted, and, for example, a melody generated from an electronic sound producing means (not shown). You can ring the bell 10 in time with your performance. Because of this, it is possible to achieve a performance with extremely high acoustic effects.

Further, while the bell 10 is being driven, the movable piece 6 is formed so that its movable range is within the allowable stress so as not to be permanently deformed. At the time of impact such as transportation and drop, the upper surface of the yoke 4 and the lower surface of the mounting member 8 contact in the downward direction in FIG. 1, and the end 4c of the yoke 4 contacts the inside of the arm portion 8a in the upward direction. Further, in FIG. 6, the end portion 4c of the yoke 4 and the arm portion 8a are in contact with each other in the upper left direction and the lower left direction. That is, the mounting member 8 contacts the yoke 4, and the movable piece 6 is prevented from being excessively deformed.

[0020]

[Effect of the device]

 As described above, according to the present invention, one end of an iron core having a coil wound around a substantially U-shaped yoke is fixed to the bottom side, and one end is fixed to a movable piece near the corner of the upper side of the yoke. Then, a permanent magnet facing the iron core is provided on the movable piece, and the mounting member is provided with an arm portion fixed to the other end of the movable piece and engageable with the end portion of the yoke. The bell is oscillated up and down with a large amplitude because a locking member that holds the bell installed swingably and that prevents the bell from coming off is attached and detached to the fitting member. Therefore, the movement of the bell is clearly visible and the cost is low. You can also ring the bell in time with the melody performance. In addition, the movable piece does not permanently deform when it is transported or dropped.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of the present invention.

FIG. 2 is a plan view of a mounting member.

FIG. 3 is a side view of a mounting member.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a perspective view of a locking member.

FIG. 6 is a plan view of FIG.

FIG. 7 is a sectional view of a main part.

FIG. 8 is a drive voltage waveform diagram.

[Explanation of symbols]

 1 iron core 1a one end of iron core 3 coil 4 yoke 4c end of yoke 6 movable piece 6a one end of movable piece 6b other end of movable piece 7 permanent magnet 8 mounting member 8a arm 8h mounting shaft 9 locking member 10 bells

Claims (1)

[Claims for utility model registration] [Claim 1] A substantially U-shaped yoke in which one end of an iron core around which a coil is wound is fixed to the bottom, and one end near the corner of the upper side of the yoke. A movable piece having a fixed portion, a permanent magnet provided on the movable piece and facing the iron core, fixed to the other end of the movable piece, and engageable with the end of the yoke. A mounting member having an arm portion, a bell swingably held by a mounting shaft projecting from the mounting member, and a member detachably mounted on the mounting member for preventing the bell from being detached. An electromagnetic bell driving device comprising a stop member.