JP2644631B2 - Hitting motion practice machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a platform on which a subject performing a ball-hitting operation while holding a hitting tool is mounted, and the load applied to the platform is determined based on detection information from load detecting means provided on the platform. The present invention relates to a hitting motion training machine provided with arithmetic processing means for calculating a load center and display means for displaying a locus of the load center during the hitting operation based on the calculation result.

[0002]

2. Description of the Related Art Such a hitting ball training machine is used for practicing a ball hitting motion such as golfing and batting. It is well known that in the practice of the hitting ball operation, whether or not the center of gravity is correctly moved accompanying the hitting ball motion is an important index for forming a correct hitting ball motion form. Therefore, the hitting ball training machine measures the center of gravity movement during the hitting ball motion and outputs the measurement result to check the quality of the hitting ball motion.

[0003] Specifically, when a subject performs a ball-hitting operation on a table, the center of the load applied to the table is calculated and stored in a storage device as time-series data in sequence.
The configuration is such that the trajectory of the center of the load is displayed on the display after the hitting operation is completed (for example, Japanese Patent Application No. Hei 1-1)
89118).

[0004]

In the case of using the above-mentioned conventional hitting motion training machine, the quality of hitting motion is determined based on the shape of a two-dimensional trajectory drawn by the load center from the start to the end of the hitting motion. I was checking. That is, attention was paid to the correlation between the shape of the locus of the load center and the hitting motion. However, in subsequent studies, it is desirable to check not only the shape of the trajectory of the load center but also the moving speed of the load center to determine whether the center of gravity associated with the hitting motion is correctly performed. I understood.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a hitting ball operation capable of checking not only the shape of the locus of the load center accompanying the hitting operation but also the moving speed of the load center. To provide training machines.

[0006]

A hitting ball training machine according to the present invention is based on a table on which a subject who performs a ball-hitting operation while holding a ball hitting tool and information detected by load detecting means provided on the table. An arithmetic processing means for calculating a load center of the load applied to the table, and a display means for displaying a trajectory of the load center during the hitting operation based on the calculation result. The characteristic structure is the arithmetic processing means
Is configured to calculate the moving speed of the load center.
The display means displays a table of lines representing the locus of the load center.
State, according to the magnitude of the moving speed of the load center
In the state changed differently, the locus of the load center and
The moving speed of the load center and the moving speed are displayed together.
It is in the point that is. A second characteristic configuration is that the display means
Represents a line representing the locus of the load center, and the color of the line represents the load.
It changes differently according to the magnitude of the center moving speed.
The point is that the display is configured to be performed in a state of being laid.

[0007]

According to the first feature configuration, the arithmetic processing means calculates the load center of the load applied to the platform on which the subject rides based on the detection information from the load detecting means, and calculates the load center from the time series data of the load center. The moving speed is also calculated. For display means
Indicates the display state of the line representing the locus of the load center,
State changed differently according to the magnitude of the moving speed
The trajectory of the load center and the
Both the moving speed and the moving speed are displayed.

According to the second feature configuration, the display means includes:
The line representing the locus of the load center is indicated by the color of the moving speed of the load center.
Table with different changes depending on the size of the degree
Is shown. In other words, the speed of movement of the load center during the ball
The size is indicated by color coding of the line representing the locus of the load center.
Is shown.

[0009]

According to the first characteristic configuration, during the hitting operation,
The moving speed of the load center at each point on the locus of the load center
Can be accurately identified, for example, load
Accurately identify where the center moves faster or slower
The shape of the locus of the load center and the shift of the load center
Movement of the center of gravity due to the hitting motion is performed correctly from both the dynamic speed
You can now determine whether or not you have been.

According to the second characteristic configuration, the movement of the center of the load is performed.
The size of the speed is color-coded for the line representing the locus of the load center.
Will be displayed so you can see the characteristics of the change at a glance
became.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a golf swing training machine will be described below with reference to the drawings.

The golf swing training machine according to the present embodiment has a first
As shown in FIG. 2 and FIG. 2, a table 1 on which a subject rides, a load detecting means 11, a tea stand 2, a processing device 3, and a CRT display 4 as a display means are provided. Then, the subject holding the club 12 as a ball hitting tool rides on the table 1 to calculate the load center of the load applied to the table 1 when performing the ball-hitting operation, and to calculate the time series data of the load center.
Calculate the moving speed of the load center from the
The time series data of each of the moving speeds is stored. Soshi
After the hitting operation, the display means 4 displays the locus of the load center.
The display state of the line representing
In the state where it has been changed differently,
The trace and the moving speed of the load center are both displayed. The subject,
The quality of the hitting ball motion can be determined by looking at the locus of the load center displayed after the hitting ball motion ends. Hereinafter, each device will be described.

The four load detecting means 11 provided at the four corners of the table 1 are load cells for detecting a change in load applied to the table 1 as a change in voltage. Since the four load cells 11 share and support the total load applied to the table 1, the center of gravity (center of load) of the load can be obtained based on the sharing ratio. The outputs of the four load cells 11 are input to the processing device 3 as shown in FIG. 3, and the calculation processing means 31 calculates the center of load.

A mounting tool 22 for mounting a ball 21 is mounted on the tea stand 2. Also, the ball 21 on the mounting tool 22
There is provided a first sensor 23 for detecting the presence or absence of the head, and a second sensor 24 for detecting the presence or absence of the head of the club 12 at a position in front of the mounting tool 22. Each of them is a reflection type optical sensor, and these detection signals are input to the processing device 3 as shown in FIG. 3, and are used for determining an impact time, a hitting operation start time, and the like.

The processing device 3 comprises an arithmetic processing means 31 composed of a CPU, I / O, etc., a main memory 32 composed of a semiconductor memory, an auxiliary memory 33 composed of a magnetic disk memory, and electronic sounds. A sound generating means 34 for generating a sound from a speaker is provided. Further, a signal processing circuit for A / D converting the output voltage from the load cell 11, shaping the waveforms of the signals from the first sensor 23 and the second sensor, and inputting them to the arithmetic processing means 31 (FIG. 3) reference).

The arithmetic processing means 31 comprises four load cells 1
The load center and its moving speed are calculated based on the normalized detection value (load sharing value) from 1. If the load sharing values W1, W2, W3, W4 of the four load cells 11 and the X and Y coordinates of the load center (X, Y) are as shown in FIG. 1, X = (W2 + W3) / (W1 + W2 + W3 + W4) Y = (W3 + W4) / (W1 + W2 + W3 + W4). However, both X and Y are values normalized by the length of one side of a square formed by connecting the positions of the four load cells 11.

Assuming that the sampling period is t and the previous value of the load center (X, Y) is (x, y), the moving speed (magnitude) V of the load center (X, Y) is as follows: SQRT ((X−x) × (X−x) + (Y−y) × (Y−y)) / t However, SQRT represents a square root operation.

The arithmetic processing means 31 has a sampling period t
Each time, the center of load (X, Y) and the moving speed V thereof are calculated from the above two equations and stored in the main memory 32 as time-series data.

At this time, the main memory 32 stores time-series data for a set time before and after the impact time as a reference. That is, the set time T1 before the impact time
Minute time series data and the set time T2 after the time of impact
Minute time series data is stored. Here, the impact time point is a time point when the state where the ball 21 is present on the mounting device 22 is changed to a state where the ball 21 is not present, and the operation processing unit 31 detects the impact time based on a change in the detection signal of the first sensor 23. Can be.

The storage area of the main memory 32 where the time-series data is stored is, in terms of software processing, a first area where data before the impact time is stored and a second area where data after the impact time is stored. Divided into Then, the first area and the second area respectively correspond to the set time T
A storage capacity enough to store the number of time-series data obtained by dividing 1 and T2 by the sampling period t is secured.

The first area is configured so that when overflow occurs, old data is discarded sequentially, and the second area is
It is configured to stop storing when an overflow occurs. As a result, the first area and the second area store time-series data for a set time (T1 + T2) before and after the time of impact.

When the set time T2 ends, it is considered that the ball hitting operation has ended, and the arithmetic processing means 31
By interpolating the time series data of the load center stored in
It is output to an RT display (hereinafter referred to as a display device) 4 and displayed as a continuous track. However, the starting point of the hitting operation is determined in the following procedure, and the trajectory after the starting point of the hitting operation is displayed on the display device 4.

As described above, the locus of the load center before the start of the hitting operation is not displayed because the fluctuation of the load center due to the so-called waffle operation is large before the start of the hitting operation. In other words, even if this variation is displayed, it does not affect the evaluation of the hitting operation itself, or rather, the locus of the load center during the hitting operation becomes difficult to see on the screen.

The starting point of the hitting operation is determined by a detection signal of the second sensor 24 for detecting the presence or absence of the head of the club 12 at a position (back swing side) in front of the mounting tool 22 of the ball 21 described above. That is, when the head shifts from the address to the backswing, the head of the club 12 moves from the address position to the backswing side, and the time when the head crosses the optical path of the second sensor 24 is detected from the detection signal of the second sensor 24.
This is the starting point of the hitting motion.

However, in the waffle operation, the club 12
It is necessary to catch the last edge by ignoring the change in the detection signal caused by the head of the second sensor 24 repeatedly traversing the optical path of the second sensor 24. Further, it is necessary to ignore a change in the detection signal generated when the head of the club 12 crosses the optical path of the second sensor 24 immediately before the time of impact.

Therefore, at the set time T1 before the time of impact, the arithmetic processing means 31 synchronizes with the sampling cycle t of the time series data such as the center of the load and the like.
Is also sampled and stored in the main memory 32. When outputting the time-series data of the center of load to the display device 4 after the set time T2, the time-series data of the detection signal of the second sensor 24 stored in the main memory 32 is traced back from the time of the impact to a predetermined time (100 ms). ) Except for the first edge, that is, the starting point of the hitting operation.

The trajectory data of the center of the load obtained after the start of the ball hitting operation obtained as described above is output to the display device 4 and displayed, and can be supplemented by an instruction from an operation panel (not shown). It can also be stored and stored in the memory 33. Then, when necessary, it can be read and displayed on the display device 4 as a reference locus.

The trajectory of the load center during the ball hitting operation displayed on the display device 4 draws, for example, a curve as shown in FIG.
In the figure, P1 corresponds to the start time of the hitting operation, and P2 corresponds to the impact time. The figure shows the trajectory of a right-handed subject performing a ball-hitting motion. The center of load starts at approximately the midpoint P1 of both feet, moves to the right foot with the backswing, and moves in the toe direction with the downswing. Move to the left foot while drawing a gentle arc.

At the point P2 corresponding to the time of impact, the center of the load is located substantially at the center of the left foot, and in the follow swing after the impact, the center of the load ends with a small circle inward and rearward of the left foot. Note that a point P2 corresponding to the time of impact is displayed by a mark next to the locus of the load center as shown in FIG.

Next, the display of the moving speed of the load center will be described. As described above, the time series data of the moving speed is stored in the main memory 32 together with the time series data of the load center during the hitting operation. The arithmetic processing means 31 divides the time-series data of the moving speed of the load center into five stages using four predetermined threshold values.

That is, when the moving speed changes as shown by a broken line in FIG. 5, this is changed to four threshold values V1, V2, V
By performing rough quantization with 3, V4, a step-like graph (solid line) composed of five-step values including zero (hereinafter referred to as quinary data) is obtained. However, these thresholds and their numbers can be changed and set.

The line representing the locus of the load center is displayed in different colors according to the obtained quinary data. That is, as shown in FIG. 5, each color is made to correspond to the five-value data of 0, V1,... Draw a line to represent it. Further, as shown in FIG. 4, a point P3 corresponding to the time point at which the moving speed has the maximum value is indicated by a mark beside the locus of the load center.

From the trajectory of the load center displayed in different colors as described above, the subject can grasp at a glance the change in the moving speed of the load center. This is one piece of useful information for knowing whether or not the center of gravity at the time of the ball hitting operation is being properly moved. The data representing the change of the moving speed is stored in the auxiliary memory 33 in the same manner as the locus data of the center of the load, and can be read out when necessary to perform color display of the locus for reference.

The screen clear of the display device 4 is executed when the ball 21 is placed on the placing tool 22. That is, the first
When it is detected from the detection signal of the sensor 23 that the ball 21 has been placed on the mounting device 22, the arithmetic processing means 31
And a predetermined area of the main memory 32 are cleared, and the process shifts to a new processing cycle.

Another embodiment will be described below. In the above embodiment, the line representing the locus of the load center is displayed in different colors according to the magnitude of the moving speed, but the display method is not limited to this. For example, when the display device 4 cannot perform color display, the display may be performed by changing luminance and line thickness stepwise according to the magnitude of the moving speed. However, it goes without saying that the discrimination of the speed change is inferior to the color-coded display.

The ideal trajectory or the trajectory at the time of the best condition stored in the auxiliary memory 33 in advance is displayed as a reference trajectory, and is compared with the trajectory of the load center during the current ball hitting operation. It is easy to check the hitting operation. At this time, if both the trajectories are displayed in different colors according to the magnitude of the moving speed, the two trajectories are confused when displayed in an overlapping manner, and cannot be distinguished.

In such a case, it is easier to see if one of the trajectories is displayed by a single color thin line without displaying the trajectory by color. However, if it is desired to compare the reference locus with the current locus including the magnitude of the moving speed, the two locuses are displayed shifted vertically or the screen is divided vertically so that the two locuses are simultaneously colored and displayed. You may. Alternatively, it may be configured to be able to switch between a front screen displaying the current locus and a back screen displaying the reference locus.

Instead of or together with the display by the display device 4, a change in the magnitude of the moving speed may be output from the sound generation unit 34 as a change in the loudness or frequency of the sound.

Incidentally, reference numerals are written in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a plan view of a golf swing practice machine according to an embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a control block diagram of the same.

FIG. 4 is a diagram showing a locus display of a load center.

FIG. 5 is a diagram showing a change in a moving speed of a load center.

[Explanation of symbols]

 1 unit 4 display means 11 load detecting means 12 hitting tool 31 arithmetic processing means

Continued on the front page (72) Inventor Masayuki Kazu 1-1-1, Hama, Amagasaki-shi, Hyogo Inside Kubota Technology Development Laboratory Co., Ltd. (56) References JP-A-4-174683 (JP, A) −32767 (JP, U)

Claims (2)

(57) [Claims] 1. Based on detection information from a platform (1) on which a subject performing a ball-hitting operation while gripping a ball-hitting tool (12) and load detection means (11) provided on the platform (1), An arithmetic processing unit (31) for calculating a load center of the load applied to the table (1) and a display unit (4) for displaying a locus of the load center during the hitting operation based on the calculation result are provided. A hit ball training machine, wherein the arithmetic processing means (3
1) is configured to calculate the moving speed of the load center.
The display means (4) displays the locus of the load center.
The display state of the line is changed to the magnitude of the moving speed of the load center.
The center of the load
And the moving speed of the load center are displayed together.
A hitting motion training machine that is composed of: 2. The display means (4) is adapted to display the center of the load.
The color of the line representing the trajectory is indicated by the color of the moving speed of the load center.
Display in a state changed differently according to the size
The hitting ball training machine according to claim 1, wherein