JPS5835273Y2 - Ball launching device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ball hitting device for hitting balls for ball games such as tennis balls.

Conventionally, when practicing tennis, for example, a player holds one or two balls in his or her hands and tosses the balls himself to hit the ball.

Alternatively, a method is used in which a person such as a coach throws a ball and the player hits the ball.

However, with this method, there are inconveniences such as the need to pick up the necessary balls each time the ball is hit, and the need for multiple personnel. A punching device has been proposed.

However, the ball hitting devices that have been proposed in the past have the disadvantage that they cannot perform efficient practice when it is necessary to hit a large number of balls, such as in tennis practice, because the number of balls that can be hit is small. be.

Further, in the conventional ball striking device, the rotation stroke of the ball striking portion is long, so that the device itself has to be enlarged.

Further, in the conventional type, since the direction in which the ball is launched is fixed, it is not possible to practice with the ball in various states, such as the ball in a service state or the ball in a toss-up state.

Therefore, the present invention makes it possible to launch a large number of balls, reduces the rotational stroke of the ball launcher, downsizes the device, and also makes it possible to vary the direction of ball launch. This allows players to practice hitting a ball in a state similar to the actual state of the ball.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

FIG. 1 shows a ball hitting device according to the present invention, and numeral 1 is a ball storage body for storing a large number of balls for hitting. A ball sending mechanism 5 is installed which sends out balls B one by one from a drilled ball sending hole 3 to a ball guide passage 4.

Further, on the front side of the ball storage body 1, a ball striking machine 6 for sequentially hitting the balls B fed through the ball guide passage 4 is mounted on a frame 7 together with the ball storage body 1.

The ball punching machine 6 installed on the frame 7 is
It is constructed as shown in FIG.

In this figure, 8 is a drive motor which is a power source for rotating the ball striking piece 9, and this drive motor 8 has a drive shaft 11 that rotates at a low speed via a reduction gear housed in a car box 10. It is provided.

The drive shaft 11 includes a support shaft 12 for the ball striking piece 9 which is mounted eccentrically with respect to the drive shaft 11, and a drive pin 1 that acts to rotate the ball striking piece 9.
As shown in FIG. 4, the drive shaft 11 is tightly fitted into a through hole 16 formed in a boss portion 15 provided at the center of the rotating body 14. It is integrally installed in such a way that it

The support shaft 12 is provided near the outer circumferential side of the rotating body 14 so as to have a sufficient distance R from the drive shaft 11 on the rotating body, and is fixedly attached to the rotating body 14. ing.

That is, as shown in FIG. 4, the support shaft 12 has a male threaded portion 1 provided only at the neck portion near the polygonal head 17.
8 is screwed into the female screw part 19 drilled in the rotating body 14, and the bent piece 20a on one end side engages with the engagement hole 21 bored in the rotating body 14, and the bent piece 20a on the other end side 20b is attached to the rotating body 14 with a rotation preventing member 20 interposed therebetween, which engages one side of the head 17 and prevents rotation.

Further, like the support shaft 12, the drive pin 13 also has a male threaded portion 2 provided only at the neck portion near the polygonal head 22.
3 is screwed into the female screw part 24 bored in the rotating body 14, and the bent part 25a on the end side engages with the engagement hole 26 bored in the rotating body 14, and the bent part 25a on the other end side is engaged with the engagement hole 26 bored in the rotating body 14. 25b is attached to the rotating body 14 with a rotation preventing member 25 interposed therebetween which engages one side of the head 21 and prevents rotation.

As mentioned above, the support shaft 12 attached to the rotating body 14 has a through hole 27 formed at its base end by the ball striking piece 9.
At the same time, the support shaft 12 is fitted into the bearing 28.
It is rotatably attached via the

The ball hitting piece 9 attached to the support shaft 12 has a sufficient length from the support shaft 12 to the tip on the free end side so that it can apply sufficient hitting force to the ball B to be hit. The side surface of the drive pin 13 is in contact with the drive pin 13 attached to the rotating body 14 in a predetermined angular range within the rotation range of the drive pin 13, and the rotation imparting force from the drive pin 13 is applied to the drive pin 13. A drive pin abutting portion 29 is provided so that the receiver can receive the drive pin.

Further, a ball ejecting portion 30 that performs a ball ejecting action is provided at the free end on the other side facing the drive pin abutting portion 29.

Furthermore, a locking protrusion 32 is provided at one end of the proximal end of the ball launching piece 9 so that one end 31a of a spring 31 that causes the ball striking piece 9 to rapidly rotate and applies a ball launching force is locked therein. is provided.

By the way, one end 31 a of the spring 31 is locked through a connecting ring 34 that is attached to the locking projection 32 through an engagement hole 33 that is a long hole.

This occurs as the spring 3 rotates as the ball ejecting piece 9 rotates.
This is intended to allow smooth expansion of 1.

Here, the other end 31b side of the spring 31 that applies a ball ejecting force to the ball ejecting piece 19 is engaged with a part that does not receive the rotational force of the drive motor 8, which is a fixed part of the ball ejecting device main body. It has been stopped.

That is, in the illustrated example, the ball striking piece 9
The ball B hit by the ball B is locked to a locking protrusion 36 provided on the outer peripheral surface of a cylindrical firing tube 35 from which the ball B is launched.

Incidentally, the firing tube 35 is attached to one side of the gear box 10 at a substantially right angle to a ball guide tube 37 that constitutes the ball guide passage 4 and is supported by a plate 36.

When the launch tube 35 has the ball guide passage 4 formed in the opening 39 of the ball holding part 38 which is formed in a curved shape at the base end so as to temporarily hold the ball B fed from the ball guide passage 4. in such a manner that one end of the ball guide tube 37, which is the terminal end of the guide passage 4, faces,
The firing tube 35 and the ball guide tube 37 are integrally attached.

Further, the firing tube 35 is operated when the ball ejecting portion 30 of the ball ejecting piece 9 faces the outermost side from the rotating body 14, that is, when the ejecting tube 35 receives the elastic restoring force of the spring 31 and is rapidly rotating. , the ball ejecting part 30 is arranged at a position where it can face the ball holding part 38, and the ball ejecting port 4 is arranged in a tangential direction of the rotation locus of the ball ejecting piece 9.
It is arranged so that 0 is located.

Therefore, since the ball ejecting piece 9 rotates in the axial direction of the firing tube 35, slots 41 are formed from the ball holding portion 38 of the firing tube 35 to the outer peripheral wall thereof.

The ball ejecting piece 9 is configured to rotate and pass the ball ejecting piece 9 through the ejecting cylinder 35 and strike the ball B fed into the ball holding portion 38.

The ball punching machine 6 having the above-mentioned configuration has a guide tube 37 attached to one side of the gear box 10 at the other end 42.
is rotatably fitted between the tips of a ball supply cylinder 43 that is continuously provided in the ball delivery hole 3 of the ball storage body 1, and a female screw portion that protrudes from the outer peripheral wall side of the firing cylinder 35. 4
5 is mounted on the frame 7 by screwing together a bolt 49 inserted through the insertion hole 48 of the piece 47.

By the way, as mentioned above, the guide tube 37 of the ball striking machine 6
is connected to the ball supply cylinder 43 of the ball storage body 1, thereby forming a guide path 4 for the balls B sent from the storage body.

Further, one end of the ball punching machine 6 is fixed to the distal end of the frame 7 with a bolt 49, while the other end is supported by a ball guide cylinder 37 rotatably fitted into a ball supply cylinder 43. Therefore, the angle of attachment to the frame 7 can be easily adjusted by simply loosening the bolt 49.

That is, the attachment angle of the launch tube 35, which is integrally attached to the ball launcher body, can also be adjusted.

Therefore, since the direction in which the ball B is hit can be arbitrarily selected, it is possible to supply the ball B to be hit in various ways.

The frame 7 that supports the ball storage body 1 and the ball striking machine 6 is provided with supporting arms 7b and positioning and holding pieces 7C at predetermined intervals in addition to the outer peripheral frame 7a. It is configured to reliably position and support the machine 6.

Further, legs 50 and 51 are provided on the frame 7 to stabilize the installation state.

Next, the case where the ball B fed from the ball storage body 1 through the guide path 4 is driven out by the ball hitting device 6 will be explained in the order of operations.

In the above operation sequence, the state immediately after the ball B is launched from the launch barrel 35 is defined as the initial state, and the explanation will be sequentially started from this initial state.

In the initial state immediately after the ball B is launched, the ball launcher piece 9 is moved by the tensile force (elastic return force) of the spring 31 applied to the locking protrusion 32, as shown in FIG.
The straight line connecting the support shaft 12 and the locking protrusion 32 is the spring 3.
The support shaft 12 moves in accordance with the rotational movement of the support shaft 12 in the direction of the arrow X while maintaining a relationship that coincides with the pulling direction of the support shaft 12.

At this time, the angular change in the tension direction of the spring 31 is relatively small, and the movement of the ball striking piece 9 itself as the support shaft 12 moves along the circle becomes almost a parallel movement (fifth
See imaginary line in figure.

). Such parallel movement, as shown by the solid line in Figure 5,
The rotating body 14 is rotated to a first rotational position in which the drive pin 13 of the rotor 14 comes into contact with the drive pin abutting portion 29 of the ball striking piece 9 .

Here, the support shaft 12 of the ball hitting piece 9 is arranged at a position offset from the center of the ball hitting piece 9, and the length l from this supporting shaft 12 to the tip on the free end side from which the ball is hit. is formed longer than the proximal end.

Furthermore, when the drive pin 13 contacts the ball striking piece 9 and is driven to rotate, the tip of the free end side is positioned in the direction from the support shaft 12 to the drive shaft 11 of the rotating body 14, and the length of the drive pin 13 is The approximately diameter bone of the rotating body 14 is the rotating body 1.
4, the length of the portion of the free end side of the ball ejecting piece 9 that protrudes from the outer periphery of the rotating body 14 is shortened.

Therefore, in the initial state shown in FIG. 3, the length of the free end of the ball striking piece 9 protruding from the rotating body 14 is the longest, and while the ball striking piece 9 moves in accordance with the rotational drive of the rotating body 14, The free end side of the ball striking piece 9 is folded inside the rotating body 14.

Next, after the first rotational position where the drive pin 13 contacts the drive pin contact portion 29 of the ball striking piece 9, the support shaft 12
and the rotating body 1 of the ball striking piece 9 by the drive pin 13.
4 is determined, when the rotating body 14 is rotated in the direction of arrow X, the drive pin 13 rotates the ball striking piece 9 in the same direction, and the ball striking piece 9 itself The drive shaft 11 rotates in the direction of arrow X.

At this time, the locking protrusion 32 is also rotationally driven around the drive shaft 11, so the spring 31 is pulled and expanded, and elastic energy is accumulated.

Further, since the rotational moment imparted to the ball striking piece 9 by the spring 31 via the locking protrusion 32 is in the counterclockwise direction in the figure around the support shaft 12,
This rotational force is received by the drive pin 13.

In this way, the ball striking piece 9 is rotationally driven by the drive pin 13, and as shown in FIG. When passing over the support shaft 12, the rotational moment of the ball striking piece 9 around the support shaft 12 becomes exactly 0, resulting in a so-called dead point positional relationship.

At this second rotational position, which is the dead center position, the rotating body 1
If the rotation of 4 is temporarily stopped, the rotating body 14 is slightly rotated in the direction of the arrow X according to the timing of hitting the ball, and the positional relationship of the dead center is canceled, thereby instantly hitting the ball. I can do that.

Such a temporary stop of the rotation of the rotating body 14 can be performed using, for example, a ratchet mechanism as shown.

That is, a notch 52 formed in the rotating body 14 and a ratchet pawl 53 that locks the notch 52 are provided.
The notches 52 and the ratchet pawls 53 may be arranged in such a positional relationship that they engage with each other when the rotating body 14 rotates to the dead center.

In this case, a micro switch or the like (not shown) is used to detect that the ratchet pawl 53 has locked the notch 52 or that the rotating body 14 has rotated to the dead center.
It is preferable to turn off the power to the drive motor 8 to stop its rotation.

Also, the ratchet pawl 53 has a solenoid plunger 54.
are connected to each other, and when a ball is to be hit, the solenoid plunger 54 is operated by a switch operation to release the ratchet pawl 53 from the notch 52, and at the same time, the power to the drive motor 8 is turned on. to rotate the rotating body 14.

Note that the configuration of these ratchet mechanisms and the like is necessary when it is desired to manually control the timing of hitting the ball, but is not necessary when the ball is to be hit continuously at regular intervals.

Next, when the rotating body 14 further rotates in the direction of arrow X from the dead center state, which is the second rotational position shown by the solid line in FIG.
Since the straight line in the tension direction of the spring 31 applied to the locking protrusion 32 of the ball striking piece 9 deviates from the support shaft 12 (deviates to the left in the figure), the ball striking piece 9 has a clockwise direction (in the direction of the arrow X). ) is applied.

Since there is no pin or the like to receive this rotational force, the ball striking piece 9 rapidly rotates in the direction of the arrow X about the support shaft 12 (see the imaginary line in FIG. 6).

). At this time, the elastic energy stored in the spring 31 is converted into rotational kinetic energy of the ball striking piece 9.

Due to this rotational movement of the ball ejecting piece 9, the ball ejecting portion 30 of the ball ejecting piece 9 suddenly collides with the ball B.
Ball B is launched in the direction of arrow Y and flies outward from the launch tube 35.

Here, the extension line of the ball launching portion 30 is formed to pass through the center of the support shaft 12, and the ball launching portion 30 is formed to pass through the center of the support shaft 12.
is the side perpendicular to the rotational movement direction of the ball launching piece 9, so at the moment the ball B is launched, the ball launching section 3
0 is almost perpendicular to the ball launch direction, and an effective ball launch action is performed.

Furthermore, as is clear from the imaginary line in FIG. As the ball continues to spread, almost the entire length l of the free end side extends outward from the outer periphery of the rotating body 9 at the moment of ball launch.

In the example described above, when the ball launching piece 9 is at the dead point position, the rotation of the rotating body 14 is stopped and the ball launching timing is selected. As shown in the figure, the ball launching piece 9 is at the dead center (
The rotation of the rotating body 14 may be stopped by the ratchet pawl 53 immediately before reaching the dead point position.

Then, the operation of the solenoid plunger 54, which releases the engagement from the notch 52 of the ratchet pawl 53, is matched with the conduction of the power source of the motor 8, which has been once stopped.

With this configuration, it is possible to ensure that the ball ejecting piece 9 is maintained in a stopped state.

Further, next, we will discuss the configuration of the ball storage body 1 that feeds the ball B into the ball launcher 6 that drives the ball B by the above-described operation, and the ball delivery device 5 disposed in this ball storage body 1, and its configuration. Explain the action.

This ball storage body 1 has a ball storage section 55 that can store a desired amount of balls B, and this ball storage section 55
As clearly shown in FIG. 8, the ball B has a bottom wall portion 57 which is inclined from the rear end toward the front wall 56 side in which the ball delivery hole 3 is formed and is curved. is configured so that it can always roll toward the ball delivery hole 3 side.

Then, when installed in a predetermined position, the ball B as described above
In order to ensure transfer, the front wall 56 side is supported by a low support piece 7C, and the rear end side is supported by a high support piece 7C.

Further, a ball sending mechanism 5 is installed at the position where the ball sending hole 3 is formed, and is configured to reliably send out a large number of balls B stored in the ball storage portion 55 one by one from the ball sending hole 3 to the ball guide path 4. It is composed of

As shown in FIGS. 9 and 10, the ball sending mechanism 5 that operates in this manner has a ball sending piece 58 that is curved to match the curvature of the bottom wall 57 of the ball storage section 55. It is configured to be swung by a drive motor 60 via a link mechanism 5 on the wall portion 57 surface.

The ball sending piece 58, which is swung by the drive motor 60, is formed with a width sufficient to place the ball B as shown in FIG. A rising piece 61 is formed in a slightly curved manner that acts to break down the structure.

Further, in the center part, a ball mounting part 62 is formed by forming a protrusion part 63.63, which throws away the balls B broken down one by one by the above-mentioned rising pieces 61.61.

A projecting piece 64 is provided projecting from the front center of the ball sending piece 58 formed in this manner, and one end of a first connecting rod 65 constituting the ring mechanism 5 is rotatably attached to the ball sending piece 58 with a pivot 66. .

The drive motor 60 is attached to the other end of the first connecting rod 65. One end of the second connecting rod 69 is rotatably attached to a support shaft 68 fixed to a plate 67 and rotates with a pivot 70. It is mounted so that it can move freely.

The side of the second connecting rod 69 that is supported by the support shaft 68 is bent into a U-shape to prevent swinging when the ball sending piece 58 swings.

At the tip of the second connecting rod 69 bent into the U-shape, one end is fixed to the drive shaft 71 of the drive motor 60, and one end is attached to the pivot 72, which rotates together with the drive shaft 71.
A third connecting rod 74 is rotatably mounted with a pivot shaft 75.

Note that a reduction gear housed in a gear box 76 is interposed between the output shaft of the drive motor 60 and the drive shaft 71, and is configured to drive the drive shaft 71 at a low speed.

As described above, the ball sending piece 58 connected to the ring mechanism 5 that converts the rotational force of the drive motor 60 into a swing motion performs a swing motion by driving the drive motor 60.

Then, the stacked balls B are pushed down by the rising pieces 61.degree.

When ball B is carried to ball delivery hole 3 in this way,
Since the ball sending piece 58 is attached to be inclined in the direction of the sending hole 3, the ball B rotates on its own axis and rolls into the ball guide passage 4, and the ball B rotates on its own axis and rolls into the ball guide path 4.
The ball rolls into the ball holding section 38 of the ball.

In addition, the drive motor 60 and the ring mechanism 5 are attached so that the proximal side of the plate 67 is bent onto the ball delivery hole 3, and is placed on the ball delivery piece 58 so that the moving ball B can be It is a cover 77 that prevents the ball B' from touching and applying unnecessary force.

Therefore, the balls B are not piled up on the ball sending piece 58, and the balls B can be sent out reliably.

As described above, according to the present invention, if a desired large number of balls B are stored in the ball storage body 1 in advance, the balls B are reliably fed one by one into the ball guide path 4 by the ball feeding mechanism 5, Sequentially, one by one, the ball is ejected by the ball ejecting machine 6.

Further, when the ball striking piece 9 of the ball striking machine 6 constituting the present invention rotates to apply a ball launching force, the rotation stroke is made small, and when the ball B is launched, the launching stroke is made large. , it is possible to obtain a sufficiently strong ball launch force while downsizing the device itself.

Furthermore, since it is also possible to temporarily stop the ejecting operation of the ball ejecting piece 9, the ejecting timing of the ball B can be freely controlled.

Therefore, the ball launch can be controlled in accordance with the movement timing of the practitioner, which is extremely convenient for sports such as tennis practice where the player practices while checking the shot form.

Further, according to the present invention, since the angle of the ball B launch tube 35 can be freely varied, the ball B can be launched in various ways.

Therefore, various types of exercises can be performed using one device.

For example, this is extremely effective for practicing a game such as tennis, where the state of the ball B is significantly different between the service state and the toss-up state.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a ball hitting device according to the present invention, FIG. 2 is a perspective view showing a ball hitting device constituting the device, and FIG. 3 is a perspective view showing a ball hitting device of the ball hitting device. The mounting near the piece is a partially sectional side view showing the state, and shows the ball hitting piece immediately after hitting the ball, and the fourth
The figure is a partially sectional bottom view showing the attachment of the ball striking piece to the rotating body, and FIGS. 5 and 6 are for explaining the operation of the ball striking piece. FIG. 6 shows a state in which the ball ejecting piece is being rotated by the drive pin, and shows the state immediately before the ball is ejected. FIG. 7 is a schematic side view showing another embodiment of the attachment of the ball striking piece to the rotating body. Fig. 8 is a sectional view showing the ball storage body, Fig. 9 is a perspective view showing the ball feeding device attached to the ball storage body, and Fig. 10 is a state in which the ball feeding device is attached to the ball storage body. FIG. 1...Ball storage body, 3...Ball delivery hole, 4...Ball guide path, 5...
... Ball delivery mechanism, 6 ... Ball delivery machine, 8 ... Drive motor, 9 ... Ball delivery piece, 11 ... Drive motor 8 drive shaft, 1
2... Support shaft, 13... Drive pin, 1
4... Rotating body, 29... Drive pin contact part, 3
0... Ball launcher, 31... Spring, 35... Launch tube.

Claims (1)

[Scope of utility model registration request] A rotary body provided with a support shaft mounted eccentrically with respect to the drive shaft and a drive pin for rotating a ball striking piece is attached to a low-speed rotating drive shaft driven by a drive motor, and a rotary body is provided on the rotary body. The support shaft is provided with a drive pin abutting portion that abuts the drive pin at a first rotational position and is rotated through a predetermined angle, and then comes out of contact with the drive pin near a second rotational position, and a ball launcher. A ball ejecting piece provided with a ball ejecting piece is rotatably attached, and a spring is stretched between one end of the ball ejecting piece and a fixed part provided on the main body of the device, so that the rotating body is rotationally driven and the driving pin is rotated. The rotational body reaches the first rotational position and comes into contact with the driving pin abutting portion of the ball ejecting piece, causing the ball ejecting piece to rotate and the spring to extend, and further, the rotating body is rotationally driven and the driving pin is moved to the second rotational position. When the rotation position is reached, the contact with the driving pin contact portion is released, and the ball ejecting piece is rapidly rotated by the elastic restoring force of the spring, so that the ball sent from the ball guide path is transferred to the ball ejecting portion. A ball launching device characterized in that the ball is launched with the following steps.