JPS6319193B2 - - Google Patents

Description

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

[Background Art] Conventionally, batting practice machines have been used that are equipped with a buzzer, a lamp, or the like to warn when a ball will be hit. However, the interval between when the buzzer sounded and when the ball was hit was fixed. Therefore, the timing at which the buzzer sounds must be precisely adjusted during assembly, making assembly extremely troublesome. Further, even if the timing is adjusted once, there is a drawback that the main body must be disassembled and readjusted each time due to changes in the voltage of the power source that drives the batting practice machine. This drawback has been a major problem, especially when dry batteries are used as a power source, since the voltage decreases as the capacity of the battery decreases.

[Purpose of the invention]

This invention makes it possible to change the interval from the time when the notification means for predicting the launch of the ball until the launch of the ball, which solves the problem of poor timing due to poor adjustment during assembly or a drop in power supply voltage. To provide a batting practice machine capable of practicing hitting a ball slowly and rapidly as in a match.

[Summary of the invention]

The batting practice machine of the present invention includes a detection switch for detecting the launch of a ball, a notification means, an input signal obtained from the detection switch, delayed for a predetermined time, and outputted to the notification means, and the delay time is variable. It is equipped with a certain notification timing variable means.

[Effect]

This invention will be explained based on FIGS. 1 to 8. In the figure, 1 is a casing, in which a ball supply hole 2 is opened on one side of the front part of the top surface, and a ball ejecting hole 3 is opened from the other side of the top surface to the front side. A handle 4 and a switch SW ₂ are provided at the rear of the upper surface of the casing 1. Casing 1
A ball receiving plate 6, a hitting arm 7, etc., which serve as ball striking means, are housed inside.

The ball receiving plate 6 has a width extending from the ball supply hole 2 to the ball ejection hole 3, and has an inclination such that the ball ejection hole 3 side is lower. The ball receiving plate 6 has an arm portion 6a extending rearward from its lower side edge, and is supported by a support shaft 8 at the tip of the arm portion 6a to be vertically movable on the base frame 9. The base end of the arm portion 6a serves as a stopper wall 6b, and the tip thereof is bent downward and has a spring-loaded lever 6c extending therefrom. A switching handle 10 is fixed to the ball receiving plate 6, and the switching handle 10 projects forward from a handle engagement hole 11 of the casing 1. The handle engagement hole 11 has engagement notches 11a and 11 on the upper and lower sides.
b, and the handle 10 can selectively engage with these upper and lower engagement notches 11a and 11b. In addition, along the rear edge of the ball receiving plate 6, the ball supporting plate 1
2 is erected on the base frame 9.

The striking arm 7 is fixed to a rotating shaft 13, and the rotating shaft 13 is supported by a base frame 9 and a gear case 16 by a pair of bearings 14 and 15. 17 and 18 are retaining rings. The striking arm 7 has a striking piece 19 at its tip and a spring locking pin 20 at its other end. A striking spring 22 is hung between the spring locking pin 20 and the spring locking pin 21 of the spring hooking lever 6c of the ball receiving plate 6. A gear 24 is attached to the rotating shaft 13 of the striking arm 7 via a one-way clutch (not shown), and a gear 24 is attached to the rotating shaft 13 of the motor 25 via a one-way clutch (not shown).
6 are engaged. The one-way clutch prevents the striking arm 7 from reversing and allows it to freely rotate in the forward direction (in the direction of arrow E in FIG. 3). The gear case 16 is fixed to the base frame 9, and the motor 25 is fixed to the gear case 16.

The advance notice means will be explained. An eccentric cam 31 (FIG. 2) is attached to one end of the rotating shaft 13 of the striking arm 7, and turns on and off a striking detection switch _SW1 consisting of a micro switch. The signal from the detection switch SW ₁ is input to the circuit section 32, which includes a timer circuit T ₁ (Fig. 7) and a drive circuit.
The buzzer SP, which serves as a means of notification, sounds through the OSC, etc.
The timer circuit T ₁ is provided with a variable resistor VR, and the resistance value can be adjusted using the knob 33 of the variable resistor VR. A variable resistance VR is attached to the casing 1. Details of the circuit section 32 will be described later. The starting switch _SW2 is connected to the battery B as shown in FIG. 6, and is also connected to the notification circuit section via the regulator REG.

Operation Ball M is fed from ball supply hole 2 to casing 1.
The ball enters the ball, rolls on the ball receiving plate 6, stops at a position where it abuts against the stopper wall 6b, and is driven out of the ball hitting hole 3 by the rotating hitting arm 7. Before launching the ball M, the detection switch SW ₁ detects the rotation of the hitting arm 7 and sounds a buzzer.
Advance notice will be announced by SP. Therefore, the practitioner can prepare by listening to this notification sound. The interval from when the warning sound of the buzzer SP sounds until the ball M is launched can be obtained by delaying the timer _T1 , but this interval can be easily changed by operating the variable resistor VR from the outside. Can be done.
Therefore, there is no need to make any troublesome adjustments during assembly. Further, even if the timing at which the buzzer SP sounds changes due to a decrease in battery voltage due to a decrease in the capacity of battery B, it can be easily adjusted. Furthermore, the practitioner can freely adjust the interval and practice hitting the ball M at any speed and speed, just like in an actual game.

The launch operation will be explained. When the switch SW ₂ is turned on, the striking arm 7 is rotated in the direction of arrow E by the motor 25, and the striking spring 22 is gradually extended. When the striking arm 7 rotates to an angle at which the striking spring 22 is fully extended, the striking arm 7 instantaneously rotates at high speed and strikes the ball M due to the restoring force of the striking spring 22 and the action of the one-way clutch.

FIG. 3 shows the state at the moment when the ball M is hit with the switching handle 10 engaged with the lower engagement notch 11b and the ball receiving plate 6 fixed downward. In this case, the ball is fired in the direction of arrow C, which is perpendicular to the angle of the hitting arm 7 at this time. That is,
Ball M is launched diagonally forward.

Figure 4 shows how the switching handle 10 is connected to the upper engagement notch 1.
1a to fix the ball receiving plate 6 upward. At this time, since the hitting arm 7 hits the ball M in a substantially horizontal state, the ball M is launched almost directly upward as shown by arrow D. At this time, the spring locking pin 21 fixing one end of the impact spring 22 moves inward as the ball receiving plate 6 moves upward.
Since the deflection length of the impact spring 22 is reduced, the force for hitting the ball M is smaller than when hitting the ball M forward as shown in FIG.

FIG. 5 shows an example in which this batting practice machine is used for tennis batting practice. Figure 5 A shows the ball M being hit forward and then hitting the racket 3 after one bounce.
This shows the case where the ball is returned with a score of 0. The returned ball M is received by a net 28 supported by a pole 27 and returns from a guide rail 29 to the ball supply hole 2 of the casing 1 of this batting practice machine. FIG. 5B shows an example in which the ball M is hit directly above and returned without bouncing.
In this case, since the force for hitting the ball M is weak, the ball M can only rise to the height shown in the figure, making it easier to practice.

The circuit section 32 will be explained. Figure 7 shows the circuit section 3.
2 is a block diagram of FIG. In the figure, _D1 is a circuit for removing chattering from the contact closing signal of the detection switch _SW1 to obtain a falling signal. _T1 is a timer circuit that starts operating at a falling edge from circuit _D1 , and the timer time ΔT can be varied by the user. D ₂ is a circuit that detects the timer operation end signal of T ₁ and generates a signal to operate timer T _2. T ₂ is a timer circuit that operates on the falling signal from circuit D ₂ , and the sound duration of the buzzer SP. Determine. The OSC consists of an oscillation circuit to operate the buzzer and a drive circuit to drive the buzzer SP. FIG. 8 shows operating waveforms of each part of the block diagram of FIG. 7.

FIG. 9 shows a specific circuit example of the block diagram of FIG. 7. Each circuit D ₁ , T ₁ , D ₂ , T ₂ indicated by a broken line,
OSC corresponds to Fig. 7. _R1 ～ _R8
is a resistor, and C ₁ to C ₆ are capacitors. VR is a variable resistor for adjusting the delay time, IC ₁ and IC ₂ are timer ICs, and the timer operation is started when a falling pulse is input to the input terminal T. The timer operation time is determined by variable resistor VR and resistor _R4 respectively.
It is proportional to the time constant determined by the resistance value of and the capacitance of capacitors C ₂ and C ₄ . IC ₃ and IC ₄ are NAND gates, and constitute an astable multivibrator with resistors R ₅ , R ₆ and capacitor C ₅ . Resistance _R7 ,
R ₈ , transistors Q ₁ , Q ₂ , Q ₃ , capacitor C ₆
is for power amplifying the output of the astable multivibrator and driving the buser SP.

The operation of this circuit section 32 is such that the rotation of the striking arm 7 closes the detection switch SW ₁ and generates a falling pulse. Using this as input, the timer circuit T ₁ operates for a period of ΔT, and then the buzzer SP is activated for a certain period of time. pronounce it,
It informs the user of the timing of the blow.

Note that the circuit section 32 is not limited to the configuration shown in FIG. 9, and may be any structure provided with a delay circuit that can vary the sounding time from when the detection switch _SW1 is turned on to when the buzzer SP sounds.

Further, in the above embodiment, a buzzer SP is used as a notification means.
Although a lamp is provided, it may be used in combination with a lamp, or the lamp alone may be used. In addition, the detection switch
Although the SW ₁ is operated by the rotation of the hitting arm 7, an ultrasonic switch for detecting the presence of the ball M may be used as a detection switch for the buzzer SP when the ball M is launched.

〔Effect of the invention〕

The batting practice machine of the present invention is capable of changing the interval from the notification of the notification means that predicts the ball's launch to the launch by an external operation, and is capable of changing the timing due to poor adjustment during assembly or a drop in power supply voltage. This has the effect of solving the problem of hitting the ball, and also allows you to practice hitting the ball slowly and quickly just like in an actual game.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a cross-sectional plan view thereof, Fig. 3 is a longitudinal sectional view thereof, and Fig. 4 is a longitudinal sectional side view of an operating state different from Fig. 3. , Figure 5 is also an explanatory diagram of its use,
FIG. 6 is a power supply circuit diagram, FIG. 7 is a block diagram of the notification circuit, FIG. 8 is an operating waveform diagram of the notification circuit, and FIG. 9 is a block diagram of the notification circuit. It is a specific circuit diagram. DESCRIPTION OF SYMBOLS 1... Casing, 3... Punching hole, 6... Ball receiving plate, 7... Hitting arm, 22... Hitting spring, 25... Motor, 31... Eccentric cam, 32...
...Circuit section, M...Ball, SW ₁ ...Detection switch, T ₁ ...Timer circuit, SP...Buzzer.

Claims (1)

[Scope of Claims] 1. A ball launcher, a detection switch for detecting the ball launch by the launcher, a notification unit, and a detection switch provided between the notification unit and the detection switch. a batting practice machine, comprising: a notification timing variable means for delaying an input signal from the input signal for a predetermined period of time and outputting the delayed signal to the notification means, the delay time being variable; 2. a striking arm in which the striking means is rotatable;
An elastic body stretched between the striking arm and the machine body is arranged to apply a rotational striking force to the striking arm, and the striking arm is rotationally driven to periodically accumulate elastic energy in the elastic body, and the subsequent 2. The batting practice machine according to claim 1, further comprising a rotation driving means that is released by rotation, and wherein said detection switch is provided at a predetermined rotation detection position of said batting arm before hitting. 3. The notification timing variable means has a circuit that obtains a falling signal from a signal from which the detection switch closes, and a timer circuit that starts operating on the falling signal from this circuit and can adjust the timer time using a variable resistor. A batting practice machine according to claim 1 or 2.