JPS61137579A - Batting exerciser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a batting practice machine for baseball, tennis, etc.

(Background Art) Conventionally, batting practice machines have been provided in which the ball is thrown using a pitching arm with an arcuate cross section formed of sheet metal, etc. However, in this case, the weight of the pitching arm is heavy, so a large drive device is required. In view of this, the pitching arm is made up of a pair of rotatable legs, and left-handed and right-handed coil springs are connected to the ends of the pitching arm, respectively. The coil springs are supported by respective shafts, elastic force is stored in the coil springs of the pitching arm, and the elastic force stored in each of the coil springs is rapidly released, so that the ball resting portion of the pitching arm is We devised a device that would throw the ball that was placed on it, but by making the throwing arm lightweight,
Small and small capacity drive tube! It can be driven by. However, in this case, the force applied to each leg of the pitching arm and each coil spring during the manufacturing process remains as residual stress in the torsional direction, resulting in a difference in the elastic force stored in each coil spring. As a result, the direction in which the ball was thrown was unstable and the ball was thrown off to the left and right.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a drive unit that can be small and small in capacity, and to throw the ball straight in a stable direction. Our goal is to provide a batting practice machine that can.

(Disclosure of the Invention) Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 7. In FIG. When the left main body cover IA and the right main body cover 18 are assembled, a pair of nuffs are integrally connected by a connecting piece 44 as shown in FIG. )41.42 to the left main body cover l^ and the right main body cover 18
They are fitted and fixed into the mounting holes 5 formed at the front end of the bottom of the left main body cover IA and the right main body cover 18, respectively, and the opening peripheries of the left main body cover IA and the right main body cover 18 are overlapped and fixed with screws 43. The pair of nuffs 1-41.42 are each screwed with a pair of #45.46 having a rubber foot 47 attached to the tip and a thread formed on the circumferential side, and the JI45.46 has a main body case. The inclination angle of the main body case 1 is adjusted by changing the amount of protrusion from the ball M, and the throwing angle of the ball M is adjusted.

The main body case l has a ball throwing opening 2 on the front side,
A pole supply section 11 is attached to the side surface.

A first ball stocker 7 9 formed of a pipe material is connected to this, and a second ball stocker 10 is connected to the first ball stocker 7 9 . 12 is a leg, and 13 is a feed cover.

An outline of the internal structure will be explained. A ball feeding port 3 is provided on the side surface of the right main body cover IB, and a pair of parallel guide rails 4 for receiving balls M fed therefrom are provided on the left main body cover IA and the right main body cover IB. Further, a pitching arm 6, a ball setting arm 7, and a driving device 20 for these are housed together with the frame 8.

The pitching arm 6 has a pair of parallel legs 6 made of wire springs.
^, 6B (Fig. 6), each leg piece 6^, 6B
One end thereof is inclined in the rotational direction and connected to form a ball mounting portion 6C that holds the ball M at three points: the parallel portions of both leg pieces 6^, 6B and the connecting portion.

Each of the leg pieces 6^, 6B has a stepped portion 51 near one end that fixes the damper stop 7 bar 80, and a bent portion 52 near the other end that fixes the cam follower shaft 17 on which the cam follower 16 is freely attached during the day. It is formed. The cam follower shaft 17 is disposed at a bent portion 52 and is pressed and fixed to the pitching arm 6 by a click spring 53.

The damper stopper 80 is disposed on the step portion 51 and is fixed to the pitching arm 6 by welding and caulking.

The damper stop 7 bar 80 serves to stop the rotation of the pitching arm 6 by colliding with the damper 31 when the pitching arm 6 moves while being accelerated to throw the ball M. The damper stopper 80 is located between the cam follower 16 and the ball rest 6C. The surface of the damper 31 that collides with the damper stop 7 bar 80 is an uneven surface as shown in FIG. 3 to reduce the impact upon collision. The damper 31 is made of a rubber-based material, and by providing a through hole 31a (FIG. 3) as necessary, it is possible to further soften the impact and reduce the impact noise. Coil springs 14 and 15 constituting ball throwing springs are integrally connected to the other ends of each of the leg pieces 6^, 6B. Said coil spring 14.15
Like the leg pieces 6A and 6B, they are made of wire springs, and each is wound in a left-handed manner. The pitching arm 6 is supported by a pipe-shaped support shaft 18 that contacts the inner peripheral surface of each coil spring 14, 15, and both ends of the support shaft 18 are connected to the inner surfaces of a pair of opposing side walls 33, 34 of the frame 8. They are respectively fitted and fixed to burring portions 32 protruding from.

The frame 8 is formed in a U-shape by a pair of opposing side walls 33, 34 and a connecting piece 35 connecting one end edge of each side wall 33, 34. Each free end 14^, 15A of the coil spring 14, 15 is connected to a connecting piece 35 of the frame 8, respectively.
It is engaged and fixed in the hemispherical recesses 28 and 29 formed in #ia of. The recesses 2B and 29 are the coil springs 14.
．． A plurality of free ends 14A, 15B of 15 are formed symmetrically and arranged in parallel in the direction of the support shaft 18.

The drive device 20 for rotating the pitching ball 7-m 6 will be explained. The cam 19 in rolling contact with the cam follower 16 is
The diameter gradually increases in the direction of rotation (and becomes smaller discontinuously along the way). The cam 19 is driven by a motor together with the ball set arm 7. This drive transmission system will be explained. A geared motor 21 (Fig. 2) with an integrated motor reducer is fixed, and a small gear 23 is press-fitted and fixed to the output shaft 21a of the geared motor 21.Furthermore, the cam 19 and the ball set arm 7 are attached to the camshaft 24.
A large gear 26 is connected to the protrusion 25 for operation.
It is rotatably fitted onto the camshaft 24. in this way,
By installing the camshaft 24, the large gear 26 meshes with the small gear 23.The ball set arm 7 is used to feed the balls M one by one from the ball supply section 11 (Fig. 1). .

Next, the operation of this embodiment will be explained based on FIGS. 3 to 5. As shown in the third case, when the ball M is sent inside from the ball feeding port 3, it is held by the ball rest 6C at the tip of the pitching arm 6.

The cam 19 rotates in the direction of the arrow in FIG. 3 and drives the pitching arm 6 via the cam follower 16 in the direction of winding the coil spring 14.15, thereby accumulating elastic force in the coil spring 14.15. . FIG. 4 shows the state of the pitching arm 6 just before the ball M is thrown. When the cam follower 16 comes off the maximum radius of the cam 19, the elastic force stored in the coil springs 14 and 15 of the pitching arm 6 suddenly increases. opened to 1
．． The pitching arm 6 is ejected while holding the ball M. The pitching arm 6, which moved while holding the ball M, suddenly stops when it collides with the damper 31, and only the ball M is moved by the coil spring 14. It is thrown out with an initial velocity accelerated by +5 energy.

Here, a pair of leg pieces 6A, 6B of the pitching arm 6 and
As mentioned above, the coil springs 14 and 15 are made of wire springs, and the force applied to these wire springs during processing steps such as wire drawing and linear processing remains as residual stress in the torsional direction. A pair of leg pieces 6A, 6B as in the present invention
In the case where the pitching arm 6 is configured as shown in FIG. Therefore, when the elastic force stored in each coil spring 14, 15 is suddenly released, the locus of motion of the ball mounting portion 6C of the pitching arm 6 becomes oblique rather than perpendicular to the axial direction of the support shaft 18. As a result, the ball M is not thrown straight ahead of the main body case 1, but shifts to the left and right.

In this case, each free end 14^, 1 of the coil spring 14.15
By changing the positions at which the balls 5B and 5B are engaged with the respective recesses 28 and 29, the locus of motion of the ball mounting portion 6C of the pitching arm 6 can be adjusted to throw the ball M straight.
For example, when the ball M is shifted to the right with respect to the main body case L and thrown out, this means that the elastic force stored in the coil spring 15 on the right side is smaller than the elastic force stored in the coil spring 14 on the left side. This is because the position where the free end 15A of the right side coil spring 15 is engaged with the recess 29 is shifted to the center side of the connecting piece 35 of the frame 8, that is, the right side coil spring 1
Free end 15 in the direction of further winding of 5 (one direction in Fig. 7)
As a result, elastic force is stored in the right side coil spring 15 from the initial state, so the elastic force stored in each coil spring 14 and 15 becomes equal, and the ball M
can be thrown straight out. Alternatively, the position where the free end 14^ of the left coil spring 14 is engaged with the recess 28 is shifted toward the left side surface 33 of the frame 8, that is, the direction in which the coil spring 14 is unwound (→ direction in FIG. 7). free end 14
M may be moved, and ball M may be thrown straight out in the same way. If the ball M is thrown out with a deviation to the left with respect to the main body case 1, the free ends 14 and 15A of the coil springs 14 and 15 may be moved in one direction in FIG. 7, contrary to the above, and the same Ball M can be thrown straight to the ball.

〔Effect of the invention〕

As described above, the present invention provides a pitching arm having a ball resting portion at one end and a pair of rotatable legs, and a ball-mounting arm and a right-handed pitching arm connected to the other end of each leg of the pitching arm. a coil spring, a support shaft that is disposed on the inner circumferential surface of each coil spring and supports each coil spring, a plurality of recesses that engage with free ends of each coil spring, and a plurality of recesses that support the pitching arm. Since the pitching arm is equipped with a rotating drive device, the pitching arm can be made lightweight and can be driven by a small and small-capacity drive section, and is also equipped with multiple recesses into which the free ends of each coil spring engage, respectively. Because of this, the direction in which the ball is thrown can be easily adjusted by arbitrarily changing the engagement position in the recess at the free end of each coil spring, and the ball can always be thrown straight. This has the effect that the coil spring can be easily assembled by simply securing and fixing the end in the recess.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an embodiment of the present invention, FIG. 2 is a cutaway front view of the same as the above, FIG. 3 is a cutaway side view of the same as the above when the ball is being fed, and FIG. FIG. 5 is a cutaway side view of the same state immediately after the ball is thrown out; FIG. 6 is a perspective view of the pitching arm of the above;
FIG. 7 is a perspective view of the free end of the coil spring in a locked state. 6-Pitching arm, 6^, 6-piece monopod, 6C-ball rest, 14.15-coil spring, 14A, 15B-...
Free end, 1st--support shaft, 28.29-recess, 20-
Drive device. Figure 1

Claims (1)

[Scope of Claims] 1) A pitching arm having a ball resting portion at one end and a pair of rotatable legs, and a left-handed and right-handed pitching arm connected to the other end of each leg of the pitching arm, respectively. A coil spring, a support shaft that supports each coil spring by contacting an inner circumferential surface of each coil spring, a plurality of recesses that engage with free ends of each coil spring, and a rotating shaft for rotating the pitching arm. A batting practice machine characterized by being equipped with a drive device that moves the batting practice machine. 2) The batting practice machine according to claim 1, wherein a plurality of recesses are arranged in parallel in the direction of the support axis.