阅读说明：本技术 偏心球制作方法 (Eccentric ball manufacturing method ) 是由 黄晨轩 于 2019-10-22 设计创作，主要内容包括：本发明是一种偏心球制作方法,包含：备制多个半球壳体；备制多个偏心配重件；安置二半球壳体,且涂布粘接剂,并放置偏心配重件于半球壳体的内壁；将二半球壳体的边缘相互贴合而结合成球体,且偏心配重件是位于球体内；以及将球体放置于承载圆盘上,启动超音波振荡融接机以产生超音波振荡能量,并传送至承载圆盘,以使得偏心配重件及球体的接触区域因摩擦而发生融接,进而固定偏心配重件于球体的内壁,形成偏心球。本发明可应用于任何空心的球类运动,藉偏心球的偏心特性而使得偏心球在飞行时产生飘忽不定的效应而营造娱乐效果。(The invention relates to a method for manufacturing an eccentric ball, which comprises the following steps: preparing a plurality of hemispherical shells; preparing a plurality of eccentric weight parts; arranging two hemispherical shells, coating adhesive, and placing an eccentric weight on the inner walls of the hemispherical shells; the edges of the two hemispherical shells are mutually attached to combine into a sphere, and the eccentric weight piece is positioned in the sphere; and placing the ball body on the bearing disc, starting the ultrasonic oscillation melting machine to generate ultrasonic oscillation energy, and transmitting the ultrasonic oscillation energy to the bearing disc, so that the contact area of the eccentric weight member and the ball body is melted due to friction, and further fixing the eccentric weight member on the inner wall of the ball body to form the eccentric ball. The invention can be applied to any hollow ball sports, and the eccentric characteristic of the eccentric ball is utilized to enable the eccentric ball to generate a fluctuating effect during flying so as to create an entertainment effect.)

1. A method for manufacturing an eccentric ball is used for manufacturing the eccentric ball, and is characterized by comprising the following steps:

step S10, preparing a plurality of hemispherical shells, wherein each hemispherical shell has the same hemispherical weight, a sphere radius and a sphere thickness;

step S11, preparing a plurality of eccentric weights, each having the same shape and size, wherein the size is smaller than the radius of the sphere and the weight of the weight is smaller than the weight of the hemisphere;

step S12, placing two of the hemispherical shells, wherein the edge of at least one of the two hemispherical shells is coated with an adhesive, and then placing the eccentric weight on an inner wall of at least one of the two hemispherical shells;

step S13, the edges of the two semi-spherical shells are adhered to each other and combined by the adhesive to form a sphere, and the eccentric weight is located in the sphere; and

step S14, placing the ball on a carrying disc, wherein the carrying disc is connected to an ultrasonic oscillation melting machine, then starting the ultrasonic oscillation melting machine to generate ultrasonic oscillation energy or vibration energy, and transmitting the ultrasonic oscillation energy or vibration energy to the carrying disc, wherein the eccentric weight member and a contact area of the ball are melted by friction under the action of the ultrasonic oscillation energy or the vibration energy, the eccentric weight member is further fixed on an inner wall of the ball to form the eccentric ball,

the bearing disc has a concave surface for placing the ball, the hemispherical shell is made of an elastic material, and the elastic material is fused with the eccentric weight member under the condition of receiving the ultrasonic oscillation energy or the vibration energy.

2. The method of claim 1, wherein the ratio of the weight member to the weight of the hemisphere is 1: 5 to 1: 50 and the elastic material is polyester fiber or celluloid (celluloid).

3. The method of claim 1, wherein the eccentric weight is a solid body, a hollow body, a porous body or a patch, and the external shape of the eccentric weight is a sphere, each of the eccentric weights has the same radius of the weight, and the radius of the weight is smaller than the radius of the sphere.

4. The method of claim 3, wherein the ratio of the radius of the weight member to the radius of the ball is 1: 5 to 1: 30.

5. a method for manufacturing an eccentric ball is used for manufacturing the eccentric ball, and is characterized by comprising the following steps:

step S20, preparing a plurality of first hemispherical shells and a plurality of second hemispherical shells, wherein each of the first hemispherical shells and each of the second hemispherical shells have the same hemispherical weight, a spherical radius and a spherical thickness;

step S21, preparing a plurality of first eccentric weights and a plurality of second eccentric weights, each of the first eccentric weights having the same external shape and external size, and each of the second eccentric weights having the same external shape and external size, wherein the external size of the first eccentric weights and the external size of the second eccentric weights are smaller than the radius of the sphere, and the weights of the first eccentric weights and the second eccentric weights are smaller than the weight of the hemisphere;

step S22, mounting the first hemispherical shell;

step S23, coating an adhesive on a surface of the first eccentric weight member, and disposing the first eccentric weight member on an inner wall of the first hemispherical case, thereby bonding the first hemispherical case and the first eccentric weight member with the adhesive;

step S24, coating the adhesive on the edge of the second hemispherical shell and/or the edge of the first hemispherical shell, and then attaching the edge of the second hemispherical shell to the edge of the first hemispherical shell to form a sphere, wherein the second eccentric weight is arranged in the sphere;

step S25, waiting for a period of time, and combining the first hemispherical shell and the second hemispherical shell into an integrated sphere by the adhesive; and

step S26, placing the ball on a carrying disc having a concave surface in a circular arc shape, wherein the carrying disc is connected to an ultrasonic oscillation welding machine, and starting the ultrasonic oscillation welding machine to generate ultrasonic oscillation energy or vibration energy to be transmitted to the carrying disc for welding the second eccentric weight to the ball,

the first hemispherical shell and the second hemispherical shell are made of an elastic material, and the elastic material is fused with the second eccentric weight under the condition of receiving the ultrasonic oscillation energy or the vibration energy.

6. The method of claim 5, wherein the ratio of the weight of the first and second eccentric weights to the weight of the hemisphere is 1: 10 to 1: 100 and the elastic material is polyester or celluloid.

7. The eccentric ball manufacturing method of claim 5, wherein the first eccentric weight and the second eccentric weight are a solid object, a hollow object, a porous object or a patch, and an external shape of the first eccentric weight and the second eccentric weight is a sphere, a radius of the first eccentric weight and the second eccentric weight is smaller than a radius of the sphere.

8. The eccentric ball manufacturing method according to claim 7, wherein the ratio of the radius of the first eccentric weight member and the second eccentric weight member to the radius of the ball body is 1: 10 to 1: 60.

Technical Field

The invention relates to a method for manufacturing an eccentric ball, in particular to a method for manufacturing an eccentric ball, which utilizes at least one eccentric weight to be fixed on the inner wall of a ball body to achieve the aim of changing the position of the integral gravity center, and can determine the fixed position of the eccentric weight according to the actual requirement, thereby creating an interesting entertainment effect with special interest and being very suitable for the interesting competition of ball games using hollow balls.

Background

In many occasions, various games are often used to create joyful atmosphere, such as geodetic games and treasure hunting games, and especially, the fun competition enables strange people to interact during the competition, so as to achieve the purpose of quickly establishing tacit.

It is well known that challenging levels are typically designed specifically for fun competitions and are done in team form by stranger people. However, it is difficult to design a suitable fun game because the use of the game is varied and the preferences of the public are difficult to grasp in advance.

For interesting competitions mainly based on balls, the reaction capability and the control skill of each person to a specific ball are greatly different, and are more agile than the bouncing capability and the action. For example, a person who is often skilled in playing table tennis may be clumsy with basketball, while a person with good soccer skills may not be able to exert strength with volleyball. Moreover, the physical strength of people is different originally, so people who have good physical strength are dominant in the conventional game, but the people who have poor physical strength are unattractive, and the interesting is not created. Even if the content which is difficult to challenge for people with good physical strength is specially designed, the advantages and disadvantages of both parties in competition are very expected, so that the overall expected effect is greatly reduced and even becomes the opposite effect.

Taking a table tennis as an example, even if a person without special training can play a ball as long as the person can do swinging motions, the required personal equipment is very simple, and the table tennis belongs to indoor sports and is not influenced by weather, so the table tennis is popular with general people.

The ball body of the table tennis is quite light, the speed of the table tennis is quite high, so the skill of the swing is in the response speed of the arms and the wrists, particularly the speed and the accuracy of the direction of the face of the table tennis controlled by the wrists. For well-trained billiards players, strong spin balls with different spin degrees can be easily sent out, so that the opponent can hardly correctly hit back to return to the ball to be out of bounds or hang a net. However, in order to increase the interest, an eccentric billiard ball is often used, and since the flight motion trajectory of the eccentric billiard ball is difficult to predict and the original rotation degree, direction and traveling speed are changed during rebound, it is difficult for a player with excellent technique to master the opponent with poor skill.

In the prior art, before two hemispheres of a billiard are not joined, a weight is adhered to the inner wall of the hemisphere by using an adhesive, and then the two hemispheres are joined to form an eccentric ball, that is, the center of gravity of the billiard is changed by using the weight to deviate from the center of the billiard. At the moment, the outer surface of the ball body still keeps the original smooth surface, so the contact characteristic with the racket is not changed, but the flying track can show the fluctuating characteristic, thereby achieving the entertainment effect.

However, the prior art has the disadvantage that the weight of the adhesive, which is used to fix the counterweight, affects the predetermined eccentricity, especially with respect to the weight of the billiards, which is relatively heavy. In addition, the user cannot determine the position of the counterweight according to actual needs, and certainly cannot fix the counterweight immediately before the interesting competition, so that the overall interest and entertainment cannot be further increased. Furthermore, the trained player can get acquainted with the characteristics of the eccentric ball through several times of back and forth batting or practice, so the original purpose is greatly reduced.

Therefore, an innovative method for manufacturing an eccentric ball is needed, in which at least one eccentric weight is fixed on the inner wall of the ball body to change the position of the center of gravity of the whole body, and the fixed position of the eccentric weight can be determined according to actual needs, so that an interesting effect with special interest is created, and the method is very suitable for an interesting competition of ball games using hollow balls to solve all the problems of the prior art.

Disclosure of Invention

The invention mainly aims to provide a method for manufacturing an eccentric ball, which mainly comprises the following steps: step S10, preparing a plurality of hemispherical shells, wherein each hemispherical shell has the same hemispherical weight, sphere radius and sphere thickness; step S11, preparing a plurality of eccentric weight parts, wherein each eccentric weight part has the same appearance shape and appearance size, the appearance size is smaller than the radius of the sphere, and the weight of the weight part is smaller than the weight of the hemisphere; step S12, two hemispherical shells are arranged, the edge of at least one of the two hemispherical shells is coated with adhesive, and then an eccentric weight is arranged on the inner wall of at least one of the two hemispherical shells; step S13, the edges of the two semi-sphere shells are mutually jointed and combined by adhesive to form a sphere, and the eccentric weight is positioned in the sphere; and step S14, placing the ball on the bearing disc, wherein the bearing disc is connected to the ultrasonic oscillation welding machine, then starting the ultrasonic oscillation welding machine to generate ultrasonic oscillation energy or vibration energy, and transmitting the ultrasonic oscillation energy or vibration energy to the bearing disc, the contact area of the eccentric weight and the ball is welded by friction under the action of the ultrasonic oscillation energy or vibration energy, the eccentric weight is further fixed on the inner wall of the ball to form an eccentric ball, and the bearing disc has a concave surface for placing the ball.

The eccentric ball made by the invention can be applied to any hollow ball sports, and the eccentric characteristic of the eccentric ball can make the eccentric ball produce erratic effect including track change, speed change and rotation state during flying, thereby producing entertainment effect.

In addition, another objective of the present invention is to provide a method for manufacturing an eccentric ball, which mainly comprises the following steps: step S20, preparing a plurality of first hemispherical shells and a plurality of second hemispherical shells, wherein each first hemispherical shell and each second hemispherical shell have the same hemispherical weight, spherical radius and spherical thickness; step S21, preparing a plurality of first eccentric weights and a plurality of second eccentric weights, each of the first eccentric weights having the same shape and size and each of the second eccentric weights having the same shape and size, wherein the size of the first eccentric weights and the size of the second eccentric weights are smaller than the radius of the sphere, and the weight of the first eccentric weights and the weight of the second eccentric weights are smaller than the weight of the hemisphere; step S22, arranging a first hemispherical shell; step S23, coating an adhesive on a surface of the first eccentric weight member, and then disposing the first eccentric weight member on an inner wall of the first hemispherical case, thereby bonding the first hemispherical case and the first eccentric weight member with the adhesive; step S24, coating an adhesive on the edge of the second hemispherical shell and/or the edge of the first hemispherical shell, and bonding the edge of the second hemispherical shell to the edge of the first hemispherical shell to form a sphere, wherein the second eccentric weight is arranged in the sphere; step S25, waiting for a period of time, and combining the first hemispherical shell and the second hemispherical shell into an integrated sphere by an adhesive; and step S26, placing the ball on a bearing disc having a concave surface of circular arc shape, wherein the bearing disc is connected to an ultrasonic oscillation melting machine, and the ultrasonic oscillation melting machine is started to generate ultrasonic oscillation energy or vibration energy to be transmitted to the bearing disc for melting the second eccentric weight member to be fixed on the ball, wherein the first hemispherical shell and the second hemispherical shell are made of elastic material, and the elastic material is melted with the second eccentric weight member under the reception of the ultrasonic oscillation energy or vibration energy to form the eccentric ball.

Particularly, the method of the present invention separately fixes the first eccentric weight and the second eccentric weight in two stages, and particularly, the second eccentric weight can be fixed at a specific position according to the requirement, so as to highlight the eccentric effect of the eccentric ball, and when the eccentric ball flies, the first eccentric weight and the second eccentric weight generate an additional angular momentum due to the rotation of the eccentric ball, thereby disturbing the flying trajectory, and after rebounding, the flying trajectory, speed and rotation are more influenced due to the change of the rotation state, thereby generating an unexpected motion state, and further producing the entertainment effect.

Drawings

FIG. 1 is a flowchart illustrating a method for manufacturing an eccentric ball according to a first embodiment of the present invention.

FIG. 2 is a schematic view illustrating an eccentric ball according to a first embodiment of the present invention.

FIG. 3 is another schematic view of an eccentric ball according to the first embodiment of the present invention.

FIG. 4 is a flowchart illustrating a method for manufacturing an eccentric ball according to a second embodiment of the present invention.

FIG. 5 is a schematic view illustrating an eccentric ball according to a second embodiment of the present invention.

FIG. 6 is a schematic view of an eccentric ball according to a second embodiment of the present invention.

Wherein the reference numerals are as follows:

s10, S11, S12, S13 and S14 steps

S20, S21, S22, S23, S24, S25 and S26 steps

10 hemisphere shell

11 first hemispherical shell

12 second hemisphere shell

20 eccentric weight

21 first eccentric weight

22 second eccentric weight

30 adhesive

P bearing disc

U ultrasonic oscillation melting machine

Detailed Description

The embodiments of the present invention will be described in more detail with reference to the drawings and the reference numerals, so that those skilled in the art can implement the embodiments after studying the specification.

Referring to fig. 1, an operation flow chart of a method for manufacturing an eccentric ball according to a first embodiment of the present invention is used to manufacture an eccentric ball with entertainment effect, and for further explaining the characteristics of the method of the present invention, reference may be made to fig. 2 and fig. 3, which are two schematic diagrams of an eccentric ball according to the method for manufacturing an eccentric ball according to the first embodiment of the present invention, respectively, wherein the schematic diagram of fig. 2 shows an eccentric ball in the method for manufacturing an eccentric ball, and the schematic diagram of fig. 3 shows an eccentric ball after the method for manufacturing an eccentric ball is completed.

As shown in fig. 1, 2 and 3, the method for manufacturing an eccentric ball according to the first embodiment of the present invention includes steps S10, S11, S12, S13 and S14.

First, in the method for manufacturing an eccentric ball according to the first embodiment of the present invention, a plurality of hemispherical cases 10 are prepared from step S10, and a plurality of eccentric weights 20 are prepared in step S11. It should be noted that the execution sequence of the steps S10 and S11 may be that the step S11 is executed first, and then the step S10 is executed, which will not affect the performance and efficacy of the eccentric ball.

Specifically, each hemispherical shell 10 has the same hemispherical weight, spherical radius and spherical thickness, and the edges of any two hemispherical shells 10 can be attached to each other for butt joint. In addition, each eccentric weight 20 has the same weight, appearance shape and appearance size, and the appearance size of the eccentric weight 20 is smaller than the sphere radius of the hemispherical shell 10, and further, the eccentric weight 20 may be a solid object, or a hollow object, or a porous object, or a patch. In particular, the weight of the weight member is less than the weight of the hemisphere, and preferably, the ratio of the weight member to the weight of the hemisphere may be 1: 5 to 1: 50.

further, if the external shape of the eccentric weights 20 is spherical, each eccentric weight 20 has the same weight radius, and the weight radius is smaller than the sphere radius of the hemispherical housing 10, and preferably, the ratio of the weight radius to the sphere radius may be 1: 5 to 1: 30.

next, step S12 is performed to place the two hemispherical shells 10 and the eccentric weight 20, as shown in fig. 2, wherein the edge of at least one of the two hemispherical shells 10 is coated with a layer of adhesive 30, and then the eccentric weight 20 is placed on the inner wall of at least one of the two hemispherical shells 10. Then, in step S13, the edges of the two half ball cases 10 are attached to each other and bonded by the adhesive 30 to form a ball, wherein the eccentric weight member 20 is located in the ball and sealed from the outside. It is to be noted that the eccentric weight 20 is now free to move within the sphere.

Finally, step S14 is executed to fix the eccentric weight 20 on the inner wall of the sphere, which is as shown in fig. 3, the sphere formed by the two hemispherical shells 10 is placed on the bearing disc P, and the bearing disc P is connected to the ultrasonic oscillation melting machine U, then the ultrasonic oscillation melting machine U is started to generate ultrasonic oscillation energy or vibration energy and transmit the ultrasonic oscillation energy or vibration energy to the bearing disc P, and the contact area between the eccentric weight 20 and the hemispherical shell 10 is melted by friction under the action of the ultrasonic oscillation energy or vibration energy, so that the eccentric weight 20 is fixed on the hemispherical shell 10 to form the required eccentric sphere. In addition, the hemispherical shell 10 is made of an elastic material, and the elastic material can be fused with the eccentric weight 20 under the receiving of the ultrasonic oscillation energy or the vibration energy. Preferably, the elastic material may be polyester fiber or celluloid (celluloid).

Since ultrasonic welding is well known in the art, the relevant technical details are not described in detail.

Further, the bearing disc P may have a concave surface for placing a ball, preferably a circular arc surface, and the radius of the circular arc is not smaller than the radius of the ball, and is more assumed to be equal to or close to the radius of the ball, so that the ball can be stably placed in the circular arc of the bearing disc P, and at this time, the eccentric weight member 20 is located on the vertical line due to the gravity, in other words, at the lowest point of the inner wall of the ball. When the ultrasonic oscillation welder U is started, ultrasonic oscillation energy or vibration energy is transmitted to the bearing disc P, preferably concentrated in a region including the lowest point in the inner wall of the sphere, so that the eccentric weight member 20 located at the lowest point of the inner wall of the sphere is fixed by fusion. In other words, the eccentric weight member 20 can be fixed in a short time by simply starting the ultrasonic oscillation welding machine U, and the operation is very simple.

In summary, the eccentric ball manufactured by the above method mainly comprises the two hemispherical shells 10 and the eccentric weight 20, and the eccentric weight 20 is sealed in the ball body formed by combining the two hemispherical shells 10, and particularly, the eccentric weight 20 is fixed at a position in the ball body. Since the eccentric weight 20 changes the position of the center of gravity of the eccentric ball, the position of the center of gravity of the eccentric ball is not located at the center of the sphere but is shifted toward the eccentric weight 20, and the eccentric characteristic of the eccentric ball causes the eccentric ball to have a fluctuating effect when flying.

Taking a table tennis as an example, if the eccentric ball manufactured by the present invention is used as a table tennis, the eccentric table tennis has different degrees of rotational motion in addition to linear velocity at the moment of being struck, and therefore, the flying trajectory of the table tennis is disturbed due to the influence of angular momentum generated by the rotational action of the table tennis itself, and a shaking phenomenon is generated. Obviously, the return stroke party is difficult to really master the rebounding track of the table tennis ball, misjudgment is caused, the bat is missed, or the ball is out of bounds, and the net is hung and lost, so that even a trained player is easy to lose the score, the entertainment effect is created, and the return stroke method is very suitable for being applied to occasions of interesting competitions.

Of course, the present invention is not limited to table tennis, but can be used for any hollow ball game, such as volleyball, basketball, soccer, beach ball, to create a recreational effect.

In addition, referring to fig. 4, an operation flow chart of a manufacturing method of an eccentric ball according to a second embodiment of the present invention is shown. As shown in fig. 4, the method for manufacturing an eccentric ball according to the second embodiment of the present invention includes steps S20, S21, S22, S23, S24, S25, and S26, so as to manufacture another eccentric ball with a fun effect. Similarly, to further clearly explain the features of the second embodiment of the present invention, fig. 5 and fig. 6 are respectively two schematic diagrams of an eccentric ball in the method for manufacturing an eccentric ball according to the second embodiment of the present invention, wherein the schematic diagram of fig. 5 shows the eccentric ball in the method for manufacturing an eccentric ball, and the schematic diagram of fig. 6 shows the eccentric ball after the method for manufacturing an eccentric ball is completed.

Specifically, the eccentric ball manufacturing method according to the second embodiment of the present invention starts from step S20, a plurality of first hemispherical shells 11 and a plurality of second hemispherical shells 12 are prepared, each of the first hemispherical shells 11 and each of the second hemispherical shells 12 have the same hemispherical weight, spherical radius and spherical thickness, and the edges of the first hemispherical shells 11 and the second hemispherical shells 12 can be attached to each other and abutted to each other. Next, in step S21, a plurality of first eccentric weights 21 and a plurality of second eccentric weights 22 are prepared, wherein the first eccentric weights 21 and the second eccentric weights 22 may be solid objects, or hollow objects, or porous objects, or patches, and particularly, each of the first eccentric weights 21 has the same appearance shape and appearance size, and each of the second eccentric weights 22 has the same appearance shape and appearance size, and the weight of the first eccentric weights 21 and the second eccentric weights 22 is less than the hemispherical weight of the first hemispherical housing 11 and the second hemispherical housing 12, preferably, the ratio of the weight of the first eccentric weights 21 and the second eccentric weights 22 to the hemispherical weight may be 1: 10 to 1: 100. further, if the external shapes of the first and second eccentric weights 21 and 22 are spherical, the radii of the first and second eccentric weights 21 and 22 are smaller than the radius of the sphere of the first and second hemispherical cases 11 and 12, and preferably, the ratio of the radius of the first and second eccentric weights 21 and 22 to the radius of the sphere may be 1: 10 to 1: 60.

it should be noted that the method of the second embodiment of the invention can also be executed after the step S21 is executed, and then the step S20 is executed, that is, the execution order of the steps S20 and S21 can be interchanged without affecting the effect achieved by the invention.

Then, in step S22, the first hemispherical case 11 is set, for example, in a container in the shape of a circular arc, and then the process proceeds to step S23, the first eccentric weight member 21 is set to the inner wall of the first hemispherical case 11, and the first eccentric weight member 21 is fixed. For example, the specific implementation method may be to coat the surface of the first eccentric weight 21 with an adhesive and then to dispose the first eccentric weight on the inner wall of the first hemispherical case 11, so that the first hemispherical case 11 and the first eccentric weight 21 can be bonded by the adhesive to achieve the fixing purpose.

Then, in step S24, the second hemispherical shell 12 and the second eccentric weight 22 are placed, specifically, an adhesive is coated on the edge of the second hemispherical shell 12 and/or the edge of the first hemispherical shell 11, the edge of the second hemispherical shell 12 is attached to the edge of the first hemispherical shell 11 to form a sphere, and the second eccentric weight 22 is placed in the sphere and freely moves in the sphere. Then, the process proceeds to step S25, where a certain time is waited for, and the first hemispherical shell 11 and the second hemispherical shell 12 are combined into a sphere by the adhesive force generated by the adhesive.

Finally, in step S26, the second eccentric weight 22 is fixed on the inner wall of the first hemispherical shell 11 or the second hemispherical shell 12 to complete the required eccentric ball, wherein the center of gravity of the eccentric ball is changed by the relative arrangement positions of the first eccentric weight 21 and the second eccentric weight 22 on the inner wall of the ball body, thereby further enhancing the entertainment effect of special interest.

Further, the implementation of step S26 can refer to the implementation of fig. 6, which is similar to the implementation of fig. 3.

First, the spherical body combined by the first hemispherical shell 11 and the second hemispherical shell 12 is placed on the bearing disc P having the circular arc concave surface, and the bearing disc P is connected to the ultrasonic oscillation welding machine U, at this time, the second eccentric weight 22 falls on the lowest position of the spherical body, that is, the position closest to the ultrasonic oscillation welding machine U, due to gravity. If the connecting portion (i.e., the edge) of the first hemispherical shell 11 and the second hemispherical shell 12 is kept at a horizontal direction (as shown in the figure) or a nearly horizontal direction, and the first hemispherical shell 11 is overlapped on the second hemispherical shell 12, the second eccentric weight 22 is on the inner wall of the second hemispherical shell 12. Therefore, in operation, the horizontal deviation angle of the connecting portion of the first hemispherical shell 11 and the second hemispherical shell 12 can be adjusted as required, so as to determine the actual position of the second eccentric weight 22 on the first hemispherical shell 11 or the second hemispherical shell 12.

Then, the ultrasonic oscillation welding machine U is activated to generate ultrasonic oscillation energy or vibration energy to be transmitted to the bearing disc P for welding and fixing the second eccentric weight member 22. In addition, the first hemispherical shell 11 and the second hemispherical shell 12 are made of an elastic material, and the elastic material can be fused with the second eccentric weight 22 under the receiving of the ultrasonic oscillation energy or vibration energy. Preferably, the elastic material may be polyester fiber or celluloid.

Specifically, the method of the second embodiment of the present invention fixes the first eccentric weight member 21 and the second eccentric weight member 22 separately in two stages, and particularly, fixes the second eccentric weight member 22 at a specific position as required, thereby highlighting the eccentric effect. For example, if the second eccentric weight 22 is fixed on the opposite side of the first eccentric weight 21, the center of gravity of the whole is still located at the center of the sphere, but the whole structure of the eccentric ball is not centrosymmetric but axisymmetric, wherein the first eccentric weight 21 and the second eccentric weight 22 are connected in a line, and the center of the sphere is located at the middle of the first eccentric weight 21 and the second eccentric weight 22, so that when the eccentric ball is flying, the first eccentric weight 21 and the second eccentric weight 22 generate additional angular momentum due to their own rotation, thereby interfering with the flight trajectory, and after rebounding, the flight trajectory, speed and rotation are more affected due to the change of the rotation state, thereby generating unexpected motion state, and further creating entertainment effect.

In summary, the present invention is characterized in that at least one eccentric weight is fixed on the inner wall of the ball body to change the position of the center of gravity of the ball body, and the fixing position of the eccentric weight can be determined according to the actual requirement, so that the manufactured eccentric ball has different and variable traveling tracks, especially when rebounding, thereby creating a very interesting entertainment effect, and being suitable for ball games using hollow balls, such as table tennis, volleyball, football, tennis, basketball and beach ball. Even a highly trained player may not grasp the movement trajectory of the eccentric ball and may swing out of the way in the fun game, and may be out of the way of a player with a low skill.

The foregoing is illustrative of the preferred embodiment of the present invention and is not to be construed as limiting thereof, since any modification or variation thereof within the spirit of the invention is intended to be covered thereby.