JPH0423589Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a batting practice machine that is used for practicing baseball, tennis, etc., and is capable of easily changing the flying distance and pitching height of a ball that pops up.

(Background Art) Conventionally, in a batting practice machine that throws a ball by having a stopper that abruptly stops the rotation of the pitching arm, a model developed in Utility Model 58-100 that allows variable flight distance and pitching height of the ball is used. There is a device shown in Publication No. 86165, and in this device, the stopper can be moved back and forth with a screw, and the position where the pitching arm contacts the stopper (deceleration device) is continuously changed, so that the desired ball can be adjusted. It is extremely difficult and time-consuming to make adjustments to obtain the desired flight distance and pitching height, and there is no system that allows you to set multiple desired flight distances and pitching heights and easily change them. That was the reality.

(Purpose of the invention) The present invention was proposed in view of the above points, and its purpose is to make the energy stored in the ball variable through an extremely simple operation, thereby changing the flight distance and pitching height of the ball. The aim is to provide a batting practice machine with a simple configuration that allows for changes.

(Disclosure of invention) The present invention will be explained below with reference to the drawings.

Figures 1 to 9 show one embodiment of the present invention, of which Figure 1 shows the internal structure of the main body 9 of the batting practice machine according to the present invention, and 1 in the figure is U-shaped. Both ends of the support shaft 2 are fitted into burring portions provided on a pair of side plates of the frame. However, as shown in Figure 5,
A pair of right-handed and left-handed coil springs 3 and 4 are wound on the left and right sides of this round bar-shaped support shaft 2, respectively.
The free ends 3a of these pair of coil springs 3, 4,
4a is connected to a handle 5 shown in FIG. 1 and the like.

Next, in FIG. 1, reference numeral 6 denotes a guide plate, which is attached so as to cover the space surrounded by the upper plate of the frame 1 and a pair of side plates. A pair of guide grooves (not shown) capable of receiving both ends of a U-shaped handle 5 connected to the handle 4a are provided. These pair of guide grooves are formed to be long in the winding direction of the coil springs 3, 4, and when the handle 5 is rotated along the winding direction of the coil springs 3, 4, the free ends 3a, 4a of the coil springs 3, 4 are It is for moving along the winding direction of the coil springs 3 and 4, and is a semicircle for engaging both ends of the handle 5 and engaging the free ends 3a and 4a of the coil springs 3 and 4. A plurality of engagement notches are formed.

On the other hand, the other ends of the coil springs 3 and 4 are connected to a pair of parallel leg pieces 7A and 7B that form the main part of the pitching arm 7, as shown in FIG. The tip portions are connected via a ball resting portion 7C. Further, a cam follower shaft 7b is disposed between the leg pieces 7A, 7B via a click spring 7a, and a cam follower 7c is pivotally supported by this cam follower shaft 7b. In addition, in the figure, 7d indicates a collision member. When the pitching arm 7 moves while being accelerated to throw out the ball, the collision member 7d causes the stopper 2
The stopper 22 serves to abruptly stop the rotation of the pitching arm 7.

As shown in detail in FIG. 4, this stopper 22 has a collision surface formed into an uneven surface.
It is made of an elastic material such as rubber, and is configured to reduce the impact upon collision. Further, the stopper 22 is rotatably supported on the inner surface of the side covers 8A, 8B (see Fig. 6 for details) by an eccentric shaft 22a eccentrically attached to the end surface 22b. It is formed into a polygon whose sides have different distances from the center of rotation, for example, a vertical cross section of which is approximately square. That is, the distance A ₀ from the center of rotation to the first side 22 ₁ , the distance A ₁ to the second side 22 ₂ , the distance A 2 to the third side 22 ₃ , and the distance A ₂ to the fourth side 22 ₄ The distance A ₃ is configured to satisfy the relationship A ₀ <A ₁ <A ₂ <A ₃ . Therefore, stopper 22
By rotating the pitching arm 7, the stopping position of the pitching arm 7 can be arbitrarily selected and changed. In this embodiment, since the stopper 22 is substantially square, the stopping position of the pitching arm 7 can be switched in four stages.

Referring again to FIG. 1, 8C is the front cover of the main body 9. A pitching port 10 is formed in this front cover 8C, and screws 11 are mounted on both sides below the pitching port 10.
A height adjustment mechanism consisting of a nut 12 is provided, and a rubber foot 13 attached to the lower end of the screw 11 is provided.
At the same time, by changing the protruding length of the screw, the inclination angle of the main body 9 is adjusted, and the throwing angle of the ball M is adjusted. Further, a ball feeding port 14 is formed in the side cover 8B, and a pair of parallel guide rails 15 for receiving balls M fed therefrom are welded to the front cover 8C.

Furthermore, a small gear 16 that is interlocked with a geared motor and a large gear 17 that meshes with the small gear 16 are disposed within the frame 1.
A cam 19 is attached to the cam 8. The diameter of the cam 19 gradually increases in the rotational direction and becomes smaller discontinuously in the middle. The cam follower 7c of the pitching arm 7 is in contact with the periphery of this cam 19. A protrusion 20 is attached to the large gear 17, and this protrusion 20 abuts the tip of a rotatable ball set arm 21. This ball set arm 21 is connected to a ball supply section 23 provided on the outside of the side cover 8B.
This is for feeding balls M one by one from (see Fig. 6).

FIG. 6 shows the overall structure of the present invention, and as mentioned above, the ball supply section 23 is attached to the side surface of the main body 9. A first ball stocker 24 formed of a pipe material is connected to this, and a second ball stocker 25 is connected to the first ball stocker 24. 26 indicates a fixing leg.

Next, this operation will be explained based on FIGS. 1 to 3. First, as shown in FIG. 1, when the ball M is sent inside from the ball feed port 14, it is held by the ball rest 7C at the tip of the pitching arm 7. The cam 19 rotates in the direction of the arrow in FIG. 1, drives the pitching arm 7 via the cam follower 7c in a direction to wind the coil springs 3 and 4, and causes the coil springs 3 and 4 to store elastic force. FIG. 2 shows the state of the pitching arm 7 just before the ball M is thrown out. When the cam follower 7c comes off the maximum radius of the cam 19, the elastic force stored in the coil springs 3 and 4 of the pitching arm 7 is suddenly released, and the pitching arm 7 transfers the ball M between the ball mounting portion 7C and the leg pieces 7A and 7B. Hold the 3 points and flick it out. The pitching arm 7, which has moved while holding the ball M, suddenly stops moving when it comes into contact with the stopper 22, and the ball M
The chisel is thrown out with an initial velocity accelerated by the energy of the coil springs 3 and 4. FIG. 3 shows the state immediately after the ball M is thrown out in this way.

In this case, by appropriately rotating the stopper 22, it is possible to
As shown in the figure, the stopping position of the pitching arm 7 is set to A ₀ ,
It is variable by switching between A ₁ , A ₂ , and A ₃ . That is, by making the stopping position of the pitching arm 7 variable, the energy stored in the ball M can be changed and the throwing angle can be changed at the same time, so the flight distance and reach of the ball M can be varied. be able to. Therefore,
Now, the stopper 22, as shown in FIG.
When the ball is fixed at the A ₀ position, the throwing angle is maximum and the energy stored in the ball M is also maximum, so the ball M flies high and far, but the stopper does not reach the stopper as shown in Figures 7 to 9. 22
By changing the angle in the order of A ₁ , A ₂ , and A ₃ via the eccentric shaft 22a, the ball M can be hit low and close.

FIG. 10 shows a second embodiment of the present invention.
In the above-mentioned embodiment, the stop position of the pitching arm 7 can be freely switched between four stages, but in this embodiment, the stopper 22 is formed into a rectangular shape with an uneven surface, and the stopper 22 is rotated around the center of the stopper 22. The shaft 22a is attached, and the short side distance A ₁ and the long side distance A ₂ from the rotating shaft 22a are set so that A ₁ < A ₂ , and the switch can be switched in two steps between the long side and the short side. The stopping position of the pitching arm 7, that is, the flight distance of the ball and the pitching angle can be changed in two stages and made variable. In other words, the collision member 7d and the rotation shaft 22
When the distance to a is set to _A1 , the ball M will fly high and far, and when it is set to _A2 , the ball will fly low and close.

In each of the embodiments described above, the stopping position of the pitching arm 7 can be adjusted by simply inserting a hand into the case through the pitching opening 10 and rotating the stopper 22 to an arbitrary position.

Further, in each of the above embodiments, the stopper 22 is formed in a polygonal (quadrilateral) shape, but it may also be in an elliptical or circular shape, and in the case of a circular shape, the rotation shaft 22
It is sufficient if the distance a is offset, and the distance between the center of rotation and the outer peripheral edge can be adjusted steplessly.

(Effects of the invention) As described above, according to the invention, the stopper that collides with the collision member of the pitching arm and abruptly stops the rotation of the pitching arm is formed in a polygonal shape and moves through the rotation axis in multiple stages. Since the pitcher arm is rotatable, and the distance between the rotation axis and the outer periphery of the stopper is made different at each stage, the stopping position of the pitching arm can be changed simply by rotating the stopper, and the flight distance of the ball can be changed. Also, there is an effect that the dispensing angle can be easily varied.

[Brief explanation of drawings]

Figures 1 to 9 show one embodiment of the present invention, with Figure 1 being a sectional view showing the internal structure, Figures 2 and 3,
7 to 9 are sectional views showing the operating state, and FIG. 4 is a perspective view of the stopper used in the present invention.
FIG. 5 is a perspective view of the pitching arm, FIG. 6 is a perspective view showing the overall configuration, and FIG. 10 is a perspective view of main parts of another embodiment of the present invention. 7...Throwing arm, 22...Stopper, 22
a...Rotation axis, M...Ball.

Claims (1)

[Claims for Utility Model Registration] (1) In a batting practice machine that has a stopper 22 that suddenly stops the rotation of the pitching arm 7 and throws the ball M carried by the pitching arm 7 to the outside, the stopper 22 has a polygonal shape. A striking device characterized in that it is formed into a shape, is rotatably supported in a plurality of stages via its rotation shaft 22a, and the distance between the rotation axis and the outer periphery of the stopper 22 is made different at each stage. Training machine. (2) The batting practice machine according to claim 1, which is a utility model registration, in which the rotation shaft 22a is attached to the stopper 22 in an offset manner.