JPH04309381A - Ball hitting action training machine - Google Patents

Abstract

PURPOSE:To check the deviation from the load center at the time point of starting a ball hitting action by displaying the load center in a ready state before starting the ball hitting action together with the load center in the course of ball hitting action. CONSTITUTION:The training machine is provided with an arithmetic processing means for calculating the load center of a load applied to a base 1 based on detected information from a load detecting means 11 provided on the base 1 on which a person to be tested for executing a ball hitting action gets, a ball hitting action start detecting means 24 for detecting a ball hitting action start time point, and a display means 4 for displaying a locus of the load center after the ball hitting action start time point based on its detected signal. The arithmetic processing means calculates a moving speed of the load center, calculates an average value of the load center within a range in which the moving speed is below a set value before the ball hitting action start time point, sets a point shown by its average value as a prescribed mark, and displays it on a display means 4 together with the locus of the load center.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a platform on which a test subject who performs a ball-striking motion while holding a ball-striking tool is mounted, and a load applied to the platform based on detection information from a load detection means provided on the platform. A batting ball comprising: arithmetic processing means for calculating a load center; a batting motion start detection means for detecting a start point of a batting motion; and a display means for displaying a locus of the load center after the start of the batting motion based on a detection signal thereof. Regarding motion training machines.

0002

2. Description of the Related Art Such a ball-striking motion training machine is used, for example, for practicing ball-striking motions in golf, batting, and the like. It is well known that when practicing these ball-hitting motions, whether or not the center of gravity is moving correctly with the ball-hitting motion is an important indicator for forming the correct ball-hitting motion form. Therefore, such a ball batting motion training machine measures the movement of the center of gravity during the ball batting motion, and outputs the measurement results so that the quality of the ball batting motion can be checked.

Specifically, when the subject performs a ball-striking motion on the table, the center of the load applied to the table is calculated, and is sequentially stored in a storage device as time-series data, and the ball-striking motion is completed. The configuration is such that the locus of the load center is later displayed on the display. A ball-striking motion start detecting means is provided for detecting the start point of the ball-striking motion, and the locus of the load center after the start of the ball-striking motion is displayed based on the detection signal (for example, Japanese Patent Application No. 189118).

0004

[Problem to be Solved by the Invention] As mentioned above, not displaying the locus of the center of load before the start of the ball-hitting motion is because
This is because the center of load before the start of the ball-striking movement fluctuates irregularly and is not directly related to the evaluation of the movement of the center of gravity during the ball-striking movement. For example, in a golf ball hitting motion, the subject often performs a so-called waffle motion in the address posture, and at this time the center of load fluctuates irregularly. If this locus is also displayed, it becomes difficult to see the locus of the center of load during the original ball-hitting motion.

However, in the above-mentioned conventional example, the center of load is displayed before the start of the ball-hitting motion, so the shift between the center of load in the stance state and the center of load at the time of starting the ball-hitting motion is not known. On the other hand, it has been found that this shift in the center of load is related to the characteristics of the subsequent ball-hitting motion, and it has been desired to improve the ability to check this shift.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to display the locus of the center of load during the ball-hitting motion as well as the center of load in the stance position before the start of the ball-striking motion. The purpose is to be able to check the deviation from the load center at the start of operation.

[0007]

[Means for Solving the Problems] The ball batting motion training device of the present invention has a platform on which a test subject who performs a batting motion while holding a ball batting tool stands, and a ball batting motion training device based on detection information from a load detecting means provided on the platform. , an arithmetic processing means for calculating the load center of the load applied to the table; a ball-striking motion start detecting means for detecting the starting point of the ball-striking motion; and a trajectory of the load center after the starting point of the ball-striking motion based on the detection signal thereof. The device is equipped with a display means for displaying, and its characteristic configuration is such that the arithmetic processing means calculates the moving speed of the load center, and within a range where the moving speed is equal to or less than a set value before the start of the ball-hitting operation. An average value of the load center is calculated, and a point indicated by the average value is displayed as a predetermined mark on the display means together with the locus of the load center.

[0008]

[Operation] According to the present invention, the calculation processing means calculates the load center of the load on the platform on which the subject stands based on the detection information from the load detection means, and also calculates the moving speed from the time series data of the load center. is also calculated. Then, based on the detection signal of the ball-striking motion start detecting means, the locus of the load center after the start of the ball-striking motion is displayed on the display means.

On the other hand, the average value of the load center within the range where the moving speed is less than or equal to the set value before the start of the ball hitting operation is calculated. Since the movement speed is within the range of the set value,
An average value is calculated excluding the center of load when a sudden weight shift occurs. In other words, the average value is calculated as a substantially static center of load in the stance state before the ball-hitting operation. Then, the point indicated by the average value is displayed as a predetermined mark on the display means together with the locus of the load center (for example, see P4 in FIG. 4).

0010

Effects of the Invention: As mentioned above, the center of load in the stance position before the start of the ball-striking motion is displayed as a mark, so by checking the deviation between this mark and the tip of the locus of the center of load, the ball-striking motion can be adjusted. It is now possible to check at a glance the deviation between the load center before the ball starts and the load center at the start of the ball-striking motion. Therefore, it has become possible to evaluate the movement of the center of gravity during the ball-hitting action, including the movement of the center of gravity from the stance position.

[0011]

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 of this embodiment has a first
As shown in FIGS. 2 and 2, the apparatus includes a platform 1 on which a subject stands, a load detection means 11 provided thereon, a tea stand 2, a processing device 3, and a CRT display 4 as a display means. Then, when the subject holding the club 12 as a ball-hitting tool gets on the stand 1 and performs a ball-hitting motion, the load center of the load applied to the table 1 is calculated, and the time-series data is stored and after the ball-hitting motion is completed. The locus of the load center is displayed on the display means 4. It also calculates the moving speed of the load center and displays its changes. The test subject can judge the quality of the ball-striking motion by looking at the locus of the center of the load displayed after the ball-striking motion is completed. Each device will be explained below.

The four load detection means 11 provided at the four corners of the table 1 are load cells that detect changes in the load applied to the table 1 as changes in voltage. Since the four load cells 11 share and support the total load applied to the table 1, the center of gravity (load center) of the load can be determined 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 arithmetic processing means 31 calculates the load center, etc.

A mounting tool 22 for mounting a ball 21 is attached to the tee stand 2. Also, the ball 21 on the mounting tool 22
A first sensor 23 that detects the presence or absence of the head of the club 12 in front of the mounting tool 22 and a second sensor 24 that detects the presence or absence of the head of the club 12 are provided. All of them are reflection type optical sensors, and their detection signals are input to the processing device 3 as shown in FIG. The first sensor 23 is used to detect the point of impact, and the second sensor 24 functions as a ball-hitting motion start detection means.

The processing device 3 includes 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 a processor that synthesizes electronic sounds. A sound generating means 34 is provided to generate sound from a speaker. It also includes 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 the waveforms to the respective arithmetic processing means 31 (FIG. 3). reference).

The calculation processing means 31 includes four load cells 1
The load center and its moving speed are calculated based on the normalized detected 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 taken as shown in Fig. 1, then 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.

[0017] Also, the sampling period is t, the load center (X
, Y) is (x, y), then the load center (X,
The moving speed (size) V of Y) is: V=SQR
T((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
At each time, the load center (X, Y) and its moving speed V are calculated from the above two formulas 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 period before and after the impact point. In other words, the set time T1 before the impact point
Minute time series data and set time T2 after impact time
Minutes of time series data is stored. Here, the impact point is the point at which the ball 21 changes from being present on the mounting tool 22 to being absent, and is detected by the arithmetic processing means 31 from a change in the detection signal of the first sensor 23. Can be done.

In terms of software processing, the storage areas in the main memory 32 that store time-series data are divided into a first area where data before the impact point is stored and a second area where data after the impact point is stored. It is divided into The first area and the second area each have a set time T
A storage capacity sufficient to store the number of time series data obtained by dividing 1 and T2 by the sampling period t is secured.

[0021] The first area is configured so that when it overflows, the old data is sequentially discarded, and the second area is
It is configured to stop storing when it overflows. As a result, time-series data for a set time (T1+T2) before and after the impact time is stored in the first area and the second area.

When the set time T2 ends, it is assumed that the ball-hitting operation is completed, and the calculation processing means 31 stores the main memory 3.
By interpolating the time series data of the load center stored in 2, C
It is output to an RT display (hereinafter referred to as a display device) 4 and displayed as a continuous trajectory. However, the starting point of the ball-hitting motion is determined by the procedure described below, and the trajectory after the starting point of the ball-hitting motion is displayed on the display device 4.

As described above, the reason why the locus of the load center before the start of the ball-hitting operation is not displayed is that before the start of the ball-hitting operation, the load center fluctuates greatly due to the so-called waffle motion. In other words, displaying this variation has no bearing on the evaluation of the ball-striking action itself, and on the contrary makes it difficult to see the locus of the center of load during the ball-striking action on the screen.

The starting point of the ball hitting operation is determined based on the detection signal of the second sensor 24 which detects the presence or absence of the head of the club 12 at a position in front of the ball 21 mounting device 22 (on the backswing side). That is, when transitioning from address to backswing, the point in time when the head of club 12 moves from the address position to the backswing side and crosses the optical path of second sensor 24 is detected from the detection signal of second sensor 24,
This is the point at which the batting action begins.

However, in the waffle motion, the club 12
It is necessary to capture the last edge while ignoring changes in the detection signal caused by the head repeatedly crossing the optical path of the second sensor 24. It is also necessary to ignore changes in the detection signal caused by the head of the club 12 crossing the optical path of the second sensor 24 just before impact.

Therefore, the arithmetic processing means 31 operates the second sensor 24 in synchronization with the sampling period t of time series data such as the load center at a set time T1 before the impact point.
The detection signal is also sampled and stored in the main memory 32. Then, when outputting the time series data of the load center 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 point of impact for a predetermined time (100 mS). ) to find the first edge, that is, the starting point of the ball-hitting motion.

The data on the trajectory of the load center after the start of the ball batting operation obtained as described above is outputted to the display device 4 for display, and can also be used for assisting by commanding from the operation panel (not shown). It can also be stored in the memory 33. Then, when necessary, it can be read out and displayed on the display device 4 as a reference trajectory.

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

At point P2, which corresponds to the point of impact, the load center is located approximately at the center of the left foot, and in the follow-up swing after impact, the load center ends in a small circle behind the inside of the left foot. Note that the point P2 corresponding to the point of impact is displayed as a mark next to the locus of the load center as shown in FIG. 4 so that the subject can understand it.

Next, the display of the moving speed of the load center will be explained. As described above, the main memory 32 stores time-series data on the center of load during a ball-hitting operation, as well as time-series data on its movement speed. 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.

In other words, when the moving speed changes as shown by the broken line in FIG.
By roughly quantizing with 3 and V4, a step-like graph (solid line) consisting of five levels of values including zero (hereinafter referred to as 5-value data) is obtained. However, these threshold values and their number can be changed and set.

The locus of the load center described above is displayed in different colors according to the obtained five-value data. In other words, as shown in Figure 5, each color corresponds to five-value data of 0, V1, ..., V4,
For periods with the same value, use the color corresponding to that value, and use the color shown in Figure 4.
The locus of the center of load is drawn. Further, as shown in FIG. 4, a point P3 corresponding to the point in time when the moving speed reaches its maximum value is displayed as a mark next to the locus of the load center.

[0033] From the locus of the load center displayed in different colors as described above, the subject can grasp at a glance changes in the moving speed of the load center. This is an effective piece of information for determining whether the center of gravity is being moved appropriately during the ball-hitting operation. Data representing changes in the moving speed can be stored in the auxiliary memory 33 in the same way as the locus data of the load center, and read out when necessary to display the reference locus in different colors.

Furthermore, in this golf swing training machine, the average value of the load center at address is calculated and displayed as a mark. First, the arithmetic processing means 31
An average value of the load centers within a range where the moving speed of the load centers is equal to or less than a set value before the start of the ball hitting operation is calculated. That is, as shown in FIG. 5, the average value of the load center during the period T0 during which the moving speed is V1 or less is calculated.

However, if the center of gravity rapidly moves within the period T0 and the moving speed exceeds V1, the load center data for the period exceeding V1 is excluded from the average value calculation. Also, period T0
begins when the ball 21 is placed on the holder 22. That is, from the detection signal of the first sensor 23, the ball 21 is detected by the mounting tool 22.
When the arithmetic processing means 31 detects that the main memory 32 is placed in a predetermined area, the arithmetic processing means 31 clears a predetermined area of the main memory 32 and shifts to a new processing cycle. Incidentally, at this time, the screen of the display device 4 is also cleared.

When the average value of the load center (X, Y) is obtained, the arithmetic processing means 31 calculates the point P4 indicated by the average value as shown in FIG.
As shown in FIG. 2, a predetermined mark (circle) is displayed on the display device 4 together with the locus of the load center. It is necessary to display it so that it can be identified even if it overlaps with the locus of the load center.

[0037] Point P4 displayed with a mark as described above
indicates a nearly static center of load at the time of address. On the other hand, the leading end P1 of the locus of the load center indicates the load center at the start of the ball-hitting motion. Checking the deviation between both P1 and P4 is an effective piece of information for knowing whether or not the center of gravity is being moved appropriately at the start of the ball-hitting motion.

Other examples will be listed below. ■ In the above example, in order to calculate the average value of the load center within the range where the moving speed of the load center is less than the set value before the start of the ball hitting operation, the set value is used to display the moving speed by color. Although one of the threshold values is V1, for example, another value smaller than V1 may be set.

■ Based on only the X-direction component, that is, the left and right components of the subject, of the moving speed of the load center, the average value of the load center within a range where the value is less than or equal to a set value is calculated. Good too. This has the advantage of simplifying calculations.

Although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

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

[Figure 2] Side view as well

[Figure 3] Similarly control block diagram

[Figure 4] Diagram showing the locus display of the load center

[Figure 5] Diagram showing changes in the moving speed of the load center

[Explanation of symbols]

1 unit 4 Display means 11 Load detection means 12 Batting tool 24. Ball batting motion start detection means 31 Arithmetic processing means

Claims (1)

[Claims] 1. Based on detection information from a platform (1) on which a subject stands while performing a ball-striking motion while holding a ball-striking tool (12), and a load detection means (11) provided on the platform (1), arithmetic processing means (31) for calculating the load center of the load applied to the table (1); a ball-striking motion start detecting means (24) for detecting the start point of the ball-striking motion; A ball batting motion training machine comprising display means (4) for displaying a locus of the load center of the ball, wherein the calculation processing means (31) calculates the moving speed of the load center, and calculates the moving speed of the load center, Calculate the average value of the load center within the range where the moving speed is less than or equal to the set value,
The ball batting motion training machine is configured to display a point indicated by the average value as a predetermined mark on the display means (4) together with the locus of the load center.