JPH0417997Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a bell striking device used in alarm clocks and the like.

(Prior Art) The present applicant has previously devised a bell-striking device described in Japanese Utility Model Publication No. 50714/1983.

This bell-striking device has a structure in which a striking ball is freely attached to the locking part of the syumoku, and the centrifugal force caused by the rotation of the syumoku causes the striking ball to strike the ring, and the centripetal force exerted when the striking ball hits the ring. runs away from Rin, and Shiyumoku continues to rotate.

(Problem to be solved by the invention) In the above-mentioned bell striking device, centrifugal force and centripetal force act alternately on the striking ball, and the inner peripheral surface of the striking ball repeatedly collides with the locking part of the shutter. The drawback was that a sound (hereinafter referred to as a rustling sound) was generated during a collision. This rustling noise is a problem as it is the noise that occurs when ringing the bell.
A bell striking device that does not generate this rustling sound is desired.

The present invention has been devised in view of the above-mentioned conventional problems, and its purpose is to provide a bell-striking device that does not generate any harsh noise.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a bell-striking device that strikes a ring with a drum connected to the rotating shaft of a motor. It is characterized by being rotatably supported by a shaft support provided at an eccentric position of the ball.

(Example) An example of the present invention will be described below based on the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG.

2 is a motor, 4 is a rotating shaft, 6 is a cap press-fitted and fixed to the rotating shaft 4, and 7 is a ring. Near both ends of the top surface 6a of the cap 6, there is a retaining member having a collar 8a. Joint portions 8 are provided in a protruding manner. 10 indicates a hit ball, and this hit ball 1
0 has a hole 1 slightly larger than the shaft diameter of the engaging portion 8.
2 is bored at a position eccentric to the center of gravity G of the hitting ball 10. And the ball 10 is the hole 1
2 is rotatably fitted into the engaging portion 8 of the shutter 6.

Next, the bell-striking operation of the striking ball 10 will be explained based on FIGS. 3a to 3d.

When the shuttlecock 6 is rotated in the direction of arrow B by the motor 2, a centrifugal force always acts on the hitting ball 10, so
As shown in FIG. 3a, the hitting ball 10 has an engaging portion 8
The ball 10 is rotated with the center of gravity G positioned outward, and as shown in FIG. 3b, the hitting ball 10 comes into contact with the ring 7 and produces a hitting sound. At that moment, a repulsive force acts on the hit ball 10 in the direction of arrow C, and the hit ball 1
0 rotates in the direction of arrow D around the engaging part 8, and the third
As shown in FIG. c, the ball 10 escapes from the ring 7, so the shuttlecock 6 continues to rotate in the direction of arrow B.
Thereafter, as shown in FIG. 3d, the hitting ball 10 returns to its original state and continues to rotate with its center of gravity G positioned outward with respect to the engaging portion 8.

In this embodiment, a circular hitting ball 10 is used, but the hitting ball used in the present invention may be fitted so as to be rotatable around a position eccentric to its center of gravity. However, the shape is not limited to a circular shape.

Further, the hitting ball 10 only needs to be rotatably fitted into the shaft 6, and as shown in this embodiment,
The fitting method is not limited to the method using the engaging portion 8 having the flange portion 8a.

Furthermore, in order to make the rotation of the hitting ball 10 on the shaft 6 smooth, lubricating oil or the like may be inserted into the gap between the hole 12 of the hitting ball 10 and the engaging portion 8.

(Effects of the invention) According to the invention, since the hitting ball is fitted with a hole drilled at a position eccentric to the center of gravity as the center of rotation, after the hitting ball makes contact with the ring, By rotating the striking ball around the engaging portion protruding from the ring, the ring can escape, and the generation of the rough sound that conventionally occurs when hitting the ring can be prevented. In addition, since the hitting ball only needs to be fitted into the shaft so that it can rotate freely, there is no need for high dimensional accuracy between the inner diameter of the hitting ball and the engagement part, as in the past, and it is also easier to assemble than before. This is something that can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention. Second
The figure is a sectional view taken along the line A-A in FIG. FIGS. 3a to 3d are explanatory diagrams of the operation. 2...Motor, 6...Shuumoku, 7...Rin,
10... hit ball, 12... hole, G... center of gravity position.

Claims (1)

[Scope of Claim for Utility Model Registration] In a bell-striking device that strikes a ring with a shaft connected to the rotating shaft of a motor, the shaft has a mechanism in which the hitting ball rotates on a shaft support provided at an eccentric position of the hitting ball. A bell striking device characterized in that it is pivotably supported.