JPS63212380A - Swing 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 [Field of Industrial Application] The present invention relates to a swing training device for practicing swinging a baseball bat, a golf club, a tennis racket, or the like.

[Conventional technology]

In sports such as baseball, golf, and tennis, swing practice can be practiced by swinging a bat, club, racket, or the like. However, if you just warm up and practice swings with a loose swing, you will not be able to get the original practice effect. Also, if you have some kind of goal when you swing, it will make your practice more competitive. For this reason, instead of using the actual equipment used in competitions, swing practice equipment is sometimes used to practice swings, which can tell whether the swing speed was sufficient and display the number of swings.

In this type of conventional swing practice device, a rotatable piece of iron is attracted with a magnet, and if it is a bat-shaped practice device, this is embedded in the head part, and the head speed when swinging is adjusted to a set value. When this piece of iron separates from the magnet due to centrifugal force, it will make a sound and notify you.
It was configured to be able to count the number of times.

In addition, the setting value of the hesodus bead for performing such an operation is set by moving the magnet to change the distance from the rotation fulcrum of the iron piece and changing the moment due to the attraction force of the magnet. The speed value was displayed by indicating the position of the magnet on the speed scale.

Note that although the above-mentioned conventional technology is well known, no technical literature could be found.

[Problem that the invention seeks to solve]

However, with such conventional swing training devices, although it is possible to know that the set speed has been exceeded, it is not possible to know to what extent the set speed has been exceeded, that is, the maximum value of the speed. Moreover, due to the structure having a mechanically movable part that allows the iron piece to rotate, the operation becomes unstable to some extent, and the mechanism that moves the magnet has looseness, so the speed scale indicated by the position of the magnet Values are only a guideline,
It was not even possible to know the exact value of the set speed, which is the standard for exceeding or not exceeding. For this reason, although it is possible to some extent to compare the amount of practice and achievement level between people using the same swing training device, it is possible to compare the amount of practice and level of achievement between people who use the same swing training device, but the results of measurement using different measuring devices, especially data from literature on practice guidance and measurement results from professional players. Comparisons with others are almost meaningless, and it is not possible to objectively determine the amount of practice or the level of achievement, and the problem is that it is not very effective in improving the motivation to practice.

[Means to solve all problems]

In order to solve the above-mentioned problems, the swing training device according to the present invention is a swing training device for practicing swings by holding the grip and swinging the swing part.
An acceleration sensor that detects the centrifugal force applied to the swing section and outputs it as an electrical signal, a peak hold circuit that holds the maximum value in the output of this acceleration sensor, and a speed that corresponds to the maximum value held by this peak hold circuit. The present invention is characterized in that it is provided with a display means for displaying the value in decimal notation.

[For production]

For example, when the swing practice device having the above configuration is used for practicing baseball bat swing, it is formed into a bat shape,
Equipment for each sport is usually shaped like a club when used to practice golf club swings, and into a racket shape when used to practice tennis racket swings. formed into a similar shape. The user practices a swing by holding the grip of the swing training device with both hands or one hand and making practice swings in the same manner as the equipment for the competition.

The acceleration sensor is provided in the swing part where centrifugal force is applied during this practice swing. This acceleration sensor does not have mechanically movable parts such as rotating parts or sliding parts, and directly outputs the stress applied to the detection part as an electric signal using the piezoelectric effect, or resists the deformation of the detection part due to this stress. It outputs as an electrical signal a change in inductance, a change in inductance, a change in capacity, etc., or a control amount for suppressing the deformation of the detection section as an electrical signal. For example, the swing portion corresponds to the head portion in the case of a bat-type and club-type swing trainer, and corresponds to the tip portion of the frame in the case of a racket-type swing trainer. This acceleration sensor uses one with high directivity and is arranged so as to detect only the acceleration component in the normal direction of the swing as much as possible, so that only the centrifugal force can be detected. The centrifugal force F applied to the swing part is expressed as follows, where m is the mass, v is the speed in the tangential direction during swing, and r is the distance to the center of the swing. The acceleration sensor detects this centrifugal force F as acceleration a of the detection section. This acceleration a is expressed as t, and since the distance Nr can be considered as a constant, this acceleration a
If we know that, we can find the velocity V. Therefore, this acceleration sensor outputs the speed of the swing section by detecting centrifugal force as acceleration.

The peak hold circuit is a circuit that detects and holds the maximum value in the output of the acceleration sensor, and when a value larger than this is output, this value is further updated and held as the maximum value. Therefore, even when the swing ends, the peak hold circuit holds the maximum value of the acceleration sensor output for that swing.

The display means displays the maximum value held by the peak hold circuit as the corresponding speed value in lO base by mechanical or electrical display means. In addition, when this display means is operated by a digital signal, the maximum value held by the peak hold circuit is converted into a digital quantity in advance and then inputted. If the peak hold circuit also operates using a digital signal, convert it to a digital amount before inputting it to the peak hold circuit. can be read as the maximum speed value. Note that when performing the swing again, the peak hold circuit is reset as necessary.

Due to the above-described effect, the swing trainer of the present invention can inform the user of the maximum speed of the swing when practicing the swing.

〔Example〕

An embodiment of the present invention will be described below based on FIGS. 1 to 3.

In this embodiment, a bat-shaped swing practice device used for practicing baseball bat swing will be described. As shown in FIG. 2, this swing training device has a cylindrical hole 2 provided in the head portion 1 of the bat, and an acceleration sensor 3 is disposed at the tip of the hole 2. The acceleration sensor 3 is a sensor that detects only the acceleration component in the direction perpendicular to the diaphragm by forming a piezoelectric element into a diaphragm shape and fixing the periphery, and the vertical direction of this diaphragm coincides with the central axis direction of the head part 1. It is arranged so that Further, the acceleration sensor 3 is molded with a conductive urethane foam 5, and is attached by fixing the periphery of the conductive urethane foam 5 to the inner circumference of the hole 2. When the acceleration sensor 3 is mounted in this manner, the element, which is originally strong against shocks, becomes even more shock-resistant due to the buffering effect of the conductive urethane foam 5. Furthermore, the shielding effect of the conductive urethane foam 5 can also prevent noise from entering the acceleration sensor 3. A display/operation panel 4 is provided on the side surface of the head section 1, and an electric circuit connected to the acceleration sensor 3 and used for display/operation on the display/operation panel 4 is arranged on the back side of the display/operation panel 4. .

The electric circuit of this swing trainer will be explained based on FIG. The output of the acceleration sensor 3 is connected to a temperature compensation circuit 7 via a low-pass filter 6. The acceleration sensor 3 outputs a voltage as an analog signal in accordance with the acceleration that the diaphragm receives. The low-pass filter 6 removes high frequency components from the output signal of the acceleration sensor 3,
This is a filter that removes noise caused by vibrations, etc. The temperature compensation circuit 7 is a circuit that compensates for errors in the output of the acceleration sensor 3 due to temperature during use. The output of the temperature compensation circuit 7 is connected to an input of a peak hold circuit 9 and one input of a comparator 10 via an amplifier 8. The output of the peak hold circuit 9 is connected to a 7-segment LCD 13 via an A/D converter 11 and a speed display driver 12. The peak hold circuit 9 is a circuit that holds and outputs the maximum value of the output signal from the acceleration sensor 3. The A/D converter 11 is a circuit that converts the maximum value held by the peak hold circuit 9 into a digital signal. The speed display driver 12 converts the input digital quantity signal into a speed value, decodes it into a 7-segment display decimal number, and displays the 7-segment LCD 13.
This is the circuit that drives the . The 7 segment LCD 13 has 1
This is a display device that displays a three-digit decimal number, and digitally displays the decimal signal output from the speed display driver 12. The other input of the comparator IO is connected to an intermediate terminal of a variable resistor 14, to which a power supply voltage VCC is applied. The variable resistor 14 sets a set value, and outputs this set value as a voltage level from an intermediate terminal. The comparator 10 is a circuit that compares re-input values and outputs the result. The output of this comparator 10 is connected to a count input of a counter 15 and an input of a one-shot multivibrator 16. The counter 15 is a circuit that counts once when the comparator 10 issues a signal indicating that the voltage output from the acceleration sensor 3 via the intensifier 8 is higher than the voltage of the set value. Further, the reset terminal of this counter 15 is grounded via a counter reset switch 25, and when this counter reset switch 25 is connected, the counter 15
The count is now reset.

The one-shot multi-by-break 16 is a circuit that continues to emit a signal for a certain period of time from when the comparator 10 issues a signal indicating that the voltage output from the acceleration sensor 3 via the amplifier 8 is higher than the set value voltage. It is. The count output of the counter 15 is connected to a 7-segment LCD 18 via a count display driver 17. The count display driver 17 is a circuit that decodes the count value input from the counter 15 into a 7-segment display decimal number and drives the 7-segment LCD 1B. The 7-segment LCD 1B is a display device that displays a 3-digit decimal number, and digitally displays the count value.

The output of the one-shot multi-vib break 16 is connected to an electronic buzzer 21 and an LED 22 via a sound driver 19 and a light emitting driver 20, respectively. The sound driver 19 is a circuit that drives the electronic buzzer 21,
While the signal is being output from the one-shot/multi-by-break 16, the mold buzzer 21 is sounded.

The light emitting driver 20 is a circuit that drives the LED 22, and causes the LED 22 to emit light while a signal is output from the one-shot multi-by-break 16. Further, this swing practice device is provided with a reset device 23, and the output of this reset device 23 is connected to the reset terminal of the peak hold circuit 9 and the input control terminal of the counter 15.

This reset device 23 is composed of a mercury switch, etc.
It is designed to emit a control signal when the bat is raised. The peak hold circuit 9 is connected to this reset device 23.
When a control signal is issued from , the maximum value held is reset. Further, the counter 15 is configured to receive a count input from the comparator 10 via a pre-sent terminal of a front flip-flop, and an input control terminal for inputting a control signal from the reset device 23 is placed at the front of the flip-flop. By connecting to the clear terminal of the flip-flop, once counting is performed, the count input is not accepted until the next time a control signal is issued from the reset device 23 and the pre-flip-flop is cleared. In this reset device 23, a release terminal provided for canceling the operation is grounded via a display hold switch 24, and when this display hold switch 24 is connected, a control signal is not emitted regardless of the state of the bat. Become. This display hold switch 24 is constituted by an alternate switch, and by operating it again, the operation of the reset device 23 can be restarted.

As shown in FIG. 3, the display and operation panel 4 of this swing trainer is provided with a power switch lever 26 for operating the power switch of the electric circuit. Disposed on the left side of the power switch lever 26 are display sections including a 7-segment LCD 13 for speed display and a 7-segment LCD 18 for count display. A knob 27 for moving the intermediate terminal of the variable resistor 14 is arranged on the right side of the power switch lever 26, and by rotating this knob 27, a set value can be set. Further, around this knob 27, a speed scale corresponding to the set value is carved. Above the knob 27, the operation parts of the display hold switch 24 and the counter reset switch 25 are arranged, and the user can operate these switches 24 and 25. 7 segment LCD1
On the upper side of 3.18, the sounding part of the electronic buzzer 21 and the LE
A light emitting section D22 is arranged.

With the swing training device configured as described above, the user practices a swing by holding the grip with both hands and making a practice swing in the same manner as a normal bat swing. The acceleration sensor 3 outputs the centrifugal force during this practice swing as a speed value. The speed value output from the acceleration sensor 3 is amplified by an amplifier 8 via a low-pass filter 6 and a temperature compensation circuit 7, and then input to a peak hold circuit 9 and a comparator 10. The peak hold circuit 9 holds and outputs the highest speed value during swing. The highest value output by this peak hold circuit 9 is
1 and 7 segment LC via speed display driver 12
Digitally displayed on D13. This 7 segment LCD
The speed display in step 13 is maintained until the bat is set up in preparation for the next swing and a control signal is issued from the reset device 23, so the user can watch this display while the bat is lying down after completing the swing. You can know the maximum swing speed. Also,
This speed display can be maintained as it is regardless of the state of the bat by connecting the display hold switch 24 and releasing the reset device 23 by operating the display operation panel 4. When the bat is raised with the display hold switch 24 open, a control signal is issued from the reset device 23, the peak hold circuit 9 resets the holding of the highest value, and preparations for the next swing are made.

The speed value input to the comparator 10 is compared with the set value input from the variable resistor 14. The setting value is
The user can arbitrarily set the speed using the speed scale by operating the knob 27 on the display operation panel 4. When the speed value becomes larger than the set value, the comparator 10 outputs the counter 15 and the one-shot multipipe rake 1.
A signal is issued at 6. The fact that a signal is emitted from the comparator 10 indicates that the speed of the swing has exceeded the set value even for a moment. Therefore, effective practice can be achieved by setting the set value to a speed that corresponds to the user's level of attainment, and practicing with only swings that exceed this set value being valid. counter 15
When inputting the signal from the comparator 10, it counts once. When this count is done, the reset device 2
Since the count input is not received until a control signal is issued from comparator 10, the speed value that once decreased due to swing speed fluctuation exceeds the set value again.
Counting will not continue even if another signal is issued. Thereby, it is possible to prevent counting from being performed twice or more in one swing. Note that if the input of the comparator 10 is taken from the output of the peak hold circuit 9 instead of from the amplifier 8, counting will not be performed more than once even if the counter 15 is not provided with a front flip-flop.

The count of the counter 15 can be reset by connecting the counter reset switch 25 by operating the display operation panel 4. The count value of the counter 15 is displayed via the count display driver 17 in the 7-segment L
Digitally displayed on CDl8. This count display is
Since it is updated and maintained every time the counter 15 counts, the user can know the effective number of swings at that time by looking at this display at any time. ' When the one-shot multivibrator 16 receives the signal from the comparator 10, it continues to emit the signal for a certain period of time. This fixed period is set within a range shorter than the time required for one swing when repeatedly practicing swings.

When the sound generation driver 19 inputs the signal from the one-shot multi-pipe lake 16, the electronic buzzer 21 is activated during that period.
sound. When the light emitting driver 20 inputs the signal from the one-shot multivibrator 16, the LE
Make D22 emit light. By listening to the sound of the electronic buzzer 21 or seeing the light of the LED 22 when swinging, the user can know that the swing speed exceeds the set value and that the swing is effective. .

〔Effect of the invention〕

As described above, the swing training device according to the present invention is a swing training device for practicing swings by holding a grip and practicing swinging the swing portion, and the swing training device detects the centrifugal force applied to the swing portion and outputs it as an electric signal. The configuration includes a sensor, a peak hold circuit that holds the maximum value of the output of the acceleration sensor, and display means that displays the maximum value held by the peak hold circuit as a corresponding speed value in decimal notation. .

Thereby, the swing trainer of the present invention can know the maximum value of the swing speed by reading the display on the display means after the swing is completed. Furthermore, since this speed is detected by an acceleration sensor that has no mechanically moving parts, the speed value is extremely accurate compared to the conventional structure in which the speed is set by moving a magnet that attracts a rotatable piece of iron. Become something. Therefore, by using this swing training device, it is possible to compare the measurement results with different measurement devices, and to know objectively the amount of practice and the degree of achievement, which helps to improve the correct practice method and motivation to practice. By improving your skills, you will be able to achieve significant training effects.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a block diagram of an electric circuit in a swing practice device, and FIG. 2 is a partial cross-section of the head portion of the swing practice device. Front view, FIG. 3 is a front view of the display operation panel in the swing trainer. 1 is a head part (swing part), 3 is an acceleration sensor, 9 is a peak hold circuit, and 13 is a 7-segment LCD (display means).

Claims (1)

[Scope of Claims] 1. A swing practice device for practicing swings by holding a grip and practicing swinging the swing part, comprising an acceleration sensor that detects centrifugal force applied to the swing part and outputs it as an electric signal, and this acceleration sensor. A swing training device comprising: a peak hold circuit for holding the maximum value in the output of the peak hold circuit; and display means for displaying the maximum value held by the peak hold circuit as a corresponding speed value in decimal notation.