JPH04126170A - Ball hitting action training machine - Google Patents

Abstract

PURPOSE:To determine the reference time point for storing data by other method and means of high reliability without using a light shielding sensor by estimating the time point when the maximum load in the course of ball hitting action appears or its adjacent time point as a reference time point, based on data from a load measuring means, and storing the data in the set time before and after the reference time point as data in the course of ball hitting action. CONSTITUTION:In a load measuring machine 1, a base 11 is provided in a state that four corners are supported by four pieces of load cells 12, 13, 14 and 15, and on the base 11, a person to be tested who grips a club C being a ball hitting implement executes a swing. In this case, the variation of a load is calculated successively at every prescribed time, and the time point when a state that its variation is larger than a set value is continued for a set time is estimated as immediately before a load peak and set as a reference time point. A storage device stores sampling data in the set time before and after its reference time point as data in the course of ball hitting action.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a table on which a test subject is placed while holding a ball-hitting tool and makes a ball-hitting motion, a load measuring means for measuring the load applied to the table or the center of the load, and The present invention relates to a ball batting motion training machine that includes a storage device that sequentially stores data obtained by sampling measurement information of a load measuring means at regular intervals, and an output device that outputs the stored information stored in the storage device.

[Conventional technology]

Such a ball-striking motion training machine is used, for example, for practicing ball-striking motions (hereinafter also referred to as swings) in golf, batting, and the like.

In practicing these swings, it is well known that whether or not the center of gravity is moving correctly during the swing is an important indicator for forming the correct swing form. Therefore, we measured the movement of the center of gravity during the swing,
For example, Japanese Patent Application Laid-open No. 1-189 is a device that can be checked later.
There is a golf swing diagnostic device disclosed in No. 118.

Hereinafter, this conventional device will be briefly explained based on FIG. 11. When the subject swings the club (C) on the stand (11), the load or load center applied to the stand (11) is measured, and the sampled data is sequentially stored in a storage device. After the swing is completed, the stored information stored in the storage device is displayed on a display (41) or outputted to a plotter (42) as a graph representing changes in load over time or a locus of the center of the load.

When storing sampled data of load or load center measurement information in the storage device (33), conventionally, the start of a swing is detected and data for a certain period of time from the start is stored. In order to detect the start of the swing, a light receiver (22A) is placed between the positions where the head of the club (C) passes during the backswing and at a position slightly away from the position where the ball (24) is set. Floodlight (
22B), and constituted a light shielding sensor (22) for detecting the passage of the head of the club (C).

Alternatively, a structure has been proposed in which the time of ball hitting is determined by a light-shielding sensor (21) that detects whether or not the ball (24) is set, and data for a set time before and after that time is stored. Note that this light-shielding sensor (21) is equipped with a light receiver (21
A) and a projector (21B).

[Problem to be solved by the invention]

The method of determining the reference time point for data storage based on the detection outputs of the light shielding sensors (21) and (22) as described above has the following problems, and improvements have been desired.

One of them is that the light shielding sensors (21) and (22) are susceptible to false detection due to the influence of dirt and dust. The other problem is due to the type of club (C) or the swing is disordered.
The head of the club (C) should pass through the light-shielding sensor (2).
In some cases, the light does not pass through the optical paths 1) and (22), and in this case, the passage of the head for determining the reference time cannot be detected.

The above problem is not limited to golf swing practice, but also applies to baseball batting practice and the like.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to determine the reference point in time for storing data by using other methods and means with higher reliability, instead of using the light-shielding sensor. It is in.

[Means to solve the problem]

The ball batting motion training device of the present invention includes a table on which a test subject is placed while gripping a ball batting tool and performing a ball batting motion, a load measuring means for measuring the load applied to the table or the center of the load, and measurement information of the load measuring means for a certain period of time. It is composed of a storage device that sequentially stores data sampled at each time, and an output device that outputs the stored information stored in the storage device, and its first characteristic configuration is that the load measurement means An arithmetic processing means is provided for estimating, based on the data, a time point at which the maximum load appears during the ball-hitting operation or a time point in the vicinity thereof as a reference time point (Ts), and the storage device stores the reference time point (Ts).
The present invention is configured to store the data at a set time before and after Ts) as data during the ball batting operation.

The second to fourth characteristic configurations specify preferred specific configurations for implementing the first characteristic configuration, and details are as follows.

That is, the second characteristic configuration is such that the arithmetic processing means calculates the weight value (WT) in the data and the subject's weight (
BW) and the ratio (IT/BW) are calculated sequentially, and the point in time when the ratio (WT/BW) exceeds the set value is determined as the reference point in time (
Ts).

A third characteristic configuration is that the calculation processing means (31) sequentially calculates the amount of change (ΔWT) in the load value (WT), and the state in which the amount of change (ΔWT) is greater than the set value continues for a set time. The point is that the time point is configured to be the reference time point (Ts).

A fourth characteristic configuration is that the arithmetic processing means (31) determines as the reference time (Ts) the point in time when the load value (WT) continues to rise for a set time or more and then continues to fall for a set time. The point is that it is configured to do so.

[For production]

According to the first characteristic configuration, the arithmetic processing means calculates and estimates the time point at which the maximum load appears during the ball hitting operation or a time point in the vicinity thereof as a reference time point (Ts) based on the sampled data of the load or the center of the load, and The storage device stores the sampling data at set times before and after the reference time (Ts) as data during the ball batting operation.
According to the characteristic configuration, the arithmetic processing means sequentially calculates the ratio (WT/BW) between the load value (WT) in the data and the body weight (BW) of the subject measured and stored in advance, and calculates the ratio. The time when (WT/BW) exceeds the set value is estimated to be near the time when the maximum load appears, and is set as the reference time (Ts).

According to the third characteristic configuration, the calculation processing means sequentially calculates the amount of change (ΔWT) in the load value (WT), and when the amount of change (ΔWT) is larger than a set value, that is, when the slope is greater than or equal to a certain slope. The time point at which the load value (WT) rapidly increases due to the slope continues for a set time is estimated to be immediately before the time point at which the maximum load appears, and is set as the reference time point (Ts).

According to the fourth characteristic configuration, the arithmetic processing means sequentially calculates whether the load value (WT) has increased or decreased, and after the increase continues for a set time or more, the load value (WT) is set to decrease. The point in time at which the drop continues for a period of time is estimated to be immediately after the point in time when the maximum load appears, and is set as the reference point in time (Ts).

〔Effect of the invention〕

According to the first characteristic configuration, when storing the sampling data of the load or the load center at the establishment time before and after the reference time during the ball-hitting operation, in order to judge the reference time, the passing of the ball-hitting tool as in the past The problem with light-shielding sensors is that the time point at which the maximum load appears or the time in its vicinity is calculated based on the sampling data itself, without the need for a light-shielding sensor to detect the presence or absence of a ball, and is estimated as the reference point. was resolved and became highly reliable. In addition, the cost reduction effect could be achieved by eliminating the need for a light-shielding sensor.

By configuring the arithmetic processing means as specifically shown in the first to fourth characteristic configurations, it has become possible to relatively easily estimate the time point in the vicinity where the maximum load appears.

〔Example〕

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

FIGS. 1 and 2 show a plan view and a side view of a golf swing training machine according to this embodiment. Also, Fig. 5 is a perspective view, and Fig. 6 is a perspective view.
The figure is a block diagram.

In the figure, (1) is a load measuring device, (2) is a tea stand,
(3) is a processing device with a built-in storage device, and (4) is a display device as an output device. The golf swing training machine of this embodiment processes the measurement data of the load measuring device (1) during the swing in the processing device (3) and stores it as time series data of the load or load center. It is displayed on the display device (4) later, and each device will be explained below.

The load measuring device (1) has four load cells (12).

A stand (11) is provided with its four corners supported by (13), (14), and (15), and the stand (11)
In the above example, the subject grasps a club (C) as a hitting tool and makes a swing. At this time, the load applied to the stand (11) is the load of the four load cells (12), (13), (14), (
15), and from these outputs, the load and load center can be determined as described later.

A support (25) for supporting a ball (24) is attached to the tee stand (2). A reset switch (23) is also provided that can be pressed with the head of the club (C) held by the subject, and its signal output is input to the I10 interface (32) of the processing device (3).

Next, calculation of the load and the load center will be explained. The subject holding the club (C) takes a stance while standing approximately in the center of the platform (11) on the load measuring device (1). Load cells (12), (13) located at the four corners of the load measuring device (1)
, (14) and (15), the table loads are canceled out in advance by zero adjustment in the load converter (16), so the output (Wl).

The total (WT) of (W2), (W3), and (W4) is the load of the subject sitting on the platform (11). That is, WT = W1 + W2 + W3 + W4 Furthermore, at this time, the position where the load is applied and the four load cells (
Since the shared output of each load cell differs depending on the relationship with the installation position of 12) to (15), the load center (X, Y) can be calculated by back calculating from these outputs.

In other words, if the four load cells (12) to (15) are placed exactly at the four corners of a square, the load cell (12) in the upper left corner (left rear of the subject) in Figure 6 is expressed as the origin. The horizontal component X and the longitudinal component Y of the load center
can be obtained from X = (W2+W3)/WT Y = (W3+W4)/WT.

In addition, load cells (12), (13), (14),
Even if the arrangement of (15) is not at the four corners of a square, the load center can be calculated by performing a correction calculation specific to the geometric arrangement of the load cell. Furthermore, if three or more load cells are provided, it is possible to determine the center of load applied to the table (11).

Each output (Wl) of four load cells (12) to (15)
.

(W2) to (W4) are load transducers (16) equipped with a measurement bridge circuit and an A/D converter, and as mentioned above, the load transducers (16)
After compensating for the weight of the sample, it is sampled at regular intervals and becomes a digital quantity. and I10 interface (
32) and are sequentially taken into the processing device (3).

The subject's load (WT) and load center (X, Y) are calculated by the arithmetic processing means (31) in the processing device (3) according to the above-mentioned formula.

Then, the calculated load and load center time series data are temporarily stored in the storage device (33).

The storage device (33) is composed of a semiconductor memory and has a limited storage capacity, so it is designed to efficiently store data during swing as will be described later.

After the swing, the data stored in the storage device (33) is output to the display device (4), allowing the subject to see changes in the load and the locus of the center of the load during the swing. Alternatively, by operating the console (34), the data stored in the storage device (33) can be saved in an external storage device (35) consisting of a magnetic disk. This is so that the data can be displayed on the display device (4) and viewed later when needed as reference data.

The display device (4) consists of a graphic display device (41) that displays the locus of the load center (X, Y) and a plotter (42) that outputs the change over time of the load (WT).

However, conversely, the locus of the load center (X, Y) can be plotted on the plotter (4
2) or display the change in load (WT) over time on a graphic display device (41).

In either case, the load and load center time series data stored in the storage device (33) are interpolated and displayed as a continuous curve. Here, the locus of the load center displayed on the display device (4) and the characteristics of the change over time of the load will be described based on FIGS. 3 and 4.

FIG. 3 shows a typical load center trajectory displayed on the graphic display (41) when a right-handed subject performs a swing. In the figure, (LP) and (R
F) shows the positions of the left foot and right foot, respectively. , In the address state, the center of load or approximately midway between the left and right feet (P
2), and when the backswing begins, it moves almost linearly toward the right foot (RF), reaches the inside of the right foot (RF), becomes the far right end, and begins the downswing from there. During the downswing, the center of load is applied slightly toward the toes, so the center of load locus moves to the left while drawing a gentle arc forward. This arc has the most bulging shape in the front position of the body, and as the club head approaches the ball (24), it returns to the front again, and reaches near the center of the left foot (LP) at the leftmost end of the arc.

It is preferable that the club (C) impacts the ball (24) here. In other words, one of the conditions for an ideal swing is that the time point corresponding to the leftmost end (Pl) of the load center locus, which indicates that the load is almost completely placed on the left foot, coincides with the time of hitting the ball.

In the follow swing after impact, the load center trajectory ends in a natural small circle behind the inside of the left foot (LP).

FIG. 4 shows a change over time in the load (WT) output to the plotter (42) corresponding to FIG. 3. The time in the diagram (T1
) indicates the time of hitting the ball. As shown in Figure 4, the change in load (WT) over time in an ideal swing decreases a little in the latter half of the backswing, begins to increase as the ball enters the downswing, and peaks at the point of impact (TI). I understand.

As described above, the trajectory of the load center in the swing and the change in load over time are displayed to judge whether the swing is good or bad or to check for defects.

In addition, as mentioned above, the sampling data of the locus of the load center in the swing and the change in load over time can be saved as reference data in the external storage device (35), so the data under the best conditions can be saved. Then, the saved data can be displayed on the display device (4) as reference data, overlapping with the current data, and the swing form can be checked while comparing them.

When making consecutive swings, the subject should press the reset switch (23) on the club head to clear the stored data in the storage device (33) and the display on the display device (4) before starting the next swing. enter.

Next, a method of storing time series data of the load (WT) and the load center (X, Y) in the storage device (33) will be explained.

As shown in Fig. 7, the storage device (33) is divided into three independent storage sections (W), (X), and (Y), each storing the load (WT) and the X component at the center of the load. , stores the Y component of the center of the load. And each storage part (W),
(X) and (Y) are configured to store data for a set time before and after a reference time (Ts) determined by the arithmetic processing means (31) as described later. The storage section (W), which will be explained below by taking as an example the storage section (W) that stores the load (WT), has a set time (
to) can be stored. The memory is configured so that the old data is discarded sequentially and the new data is stored sequentially. That is, always set time (to)
The latest data for minutes is stored. Therefore, the reference point (
After time (tl) has elapsed after Ts), the storage unit (W
) stores data for the time (to-t+) before the reference time (Ts) and data for the time (tl) after the reference time (Ts), so the stored data at this time may be transferred to the display device (4) and displayed as data during the swing motion. A memory section that stores the load center (X
) and (Y).

Next, a procedure for determining the above reference time point (Ts) will be explained. In the golf swing training machine of this embodiment, the load (W
The standard time point (Ts) is determined from the change in T) over time. As described above, the load (WT) during the swing motion changes with a steep peak at the time of hitting the ball (TI) as shown in FIG. Therefore, the arithmetic processing means (
31) calculates a time point in the vicinity of the above-mentioned batted ball time point (T1) and sets it as a reference time point (Ts).

First, the test subject took a stance on the platform (11) and immediately after pressing the reset switch (23), the load data (WT
) as the subject's body weight (BW) and the calculation processing means (31)
Store it in the internal register. After that, the calculation processing means (
31) sequentially calculates the ratio (R=WT/BW) between the load data (WT) and the body weight (WT), and sets the point in time when the ratio (R) exceeds a predetermined value (RO) as the reference point. (T
s). In fact, in order to avoid the influence of noise, the reference time (Ts) is set only when the ratio (WT/BW) exceeds a predetermined value (RO) for a certain period of time.

A flowchart of the above processing loop is shown in FIG. The counter in the figure is for counting the above-mentioned fixed time. Further, TS is a flag indicating the reference time (Ts), and when it is 1°, it indicates that the reference time (Ts) has passed.

As described above, the display device (4) displays the load change and the locus of the load center for the set time before and after the reference point, which is the point near the point when the load reaches its maximum during the swing. Become.

[Another example]

In addition to the above-mentioned embodiments, the estimation calculation that determines a point in the vicinity of the point in time when the load becomes maximum during the swing and uses it as a reference point can be realized by various methods, including the methods listed below.

i) As shown in the flowchart in Figure 9, the amount of change (ΔWT) in the load (WT) is calculated sequentially at regular intervals, and the amount of change (ΔWT) is greater than the set value (ΔWTO) or continues for the set time. The time point is estimated to be just before the load peak and is set as the reference time point. (WTI) in the figure is the load data (
The previous value of WT) is shown.

ii) As shown in the flowchart in Figure 10, the load (
WT) is sequentially checked, and after continuing to rise for a set time or more, the time when the load continues to fall for a set time is estimated to be immediately after the load peak, and is set as the reference time. (UP) in the figure is a flag indicating that the load has continued to rise for longer than a set time.

ii) Only the first half of the conditions in ii), that is, the point in time when the temperature rises continuously for more than a set time is defined as the reference point.

Alternatively, the reference time point may be estimated and calculated based on the change in the center of load during the swing. For example, the load center (X, Y
) It is also possible to similarly obtain a time point in the vicinity of the time point when the position becomes the leftmost end from the change over time of the X component data (X) of the load center.

In the above embodiment, the load measuring means (S) for measuring the load applied to the table (11) and the load center is equipped with four load cells (
12) to (15) and the arithmetic processing means (31) provided in the treatment device (3) are configured as main parts, but there is also a configuration in which the arithmetic processing means (31) is provided in the load measuring device (1). The load measuring means (S) may be configured with:

Furthermore, it is also possible to omit the operation of pressing the reset switch (23) with the club head before starting the swing. In this case, the display device (4) maintains the previous display until the display device (4) displays data regarding the new swing when the swing ends, or more precisely, when time (t,) has elapsed from the reference time (Ts). Also, at this point, the flag TS is also reset. Furthermore, in Figure 8, the load measurement value (WT) taken immediately after the reset switch was turned on was calculated using the body weight (BW).
) is performed when the subject stands on the stand (11) and takes a stance.

It goes without saying that the ball batting motion training device of the present invention can be applied not only to golf swing practice but also to various other swing practices such as baseball batting practice and tennis stroke practice.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

1 to 7 are diagrams relating to a ball batting motion training machine according to an embodiment of the present invention, in which FIG. 1 is a plan view, FIG. 2 is a side view, and FIG. 3 is a display example of the load center locus. FIG. 4 is a diagram showing a display example of changes in load over time, FIG. 5 is a perspective view, FIG. 6 is a block diagram, and FIG. 7 is a memory configuration diagram of the storage device. FIG. 8 is a control flowchart. 9 and 10 are flowcharts according to another embodiment, and FIG. 11 is a perspective view showing a conventional example. (4)... Output device, (11)... Unit, (31)... Arithmetic processing means, (33)...
...Storage device, (C) ...Ball hitting tool, (S)
...Load measurement means.

Claims (1)

[Scope of Claims] 1. A table (11) on which a test subject is placed while holding a ball-hitting tool (C) and making a ball-hitting motion, and a load measuring means (S) for measuring the load or load center on the table (11). , a storage device (33) that sequentially stores data obtained by sampling the measurement information of the load measuring means (S) at regular intervals, and an output device (4) that outputs the stored information stored in the storage device (33).
), the ball-striking motion training device is a ball-striking motion training device comprising: a calculation for estimating a time point at which the maximum load appears during the ball-striking motion or a point in the vicinity thereof as a reference time point (Ts) based on the data from the load measuring means (S); A processing means (31) is provided, and the storage device (33) stores the reference time (Ts).
A ball batting motion training machine configured to store the data at set times before and after as data during a ball batting motion. 2. The arithmetic processing means (31) calculates the ratio (
2. The ball batting motion training machine according to claim 1, wherein the ball batting motion training machine is configured to sequentially calculate the ratio (WT/BW) and set the time point when the ratio (WT/BW) exceeds a set value as the reference time point (Ts). 3. The calculation processing means (31) calculates the load value (WT)
The amount of change (ΔWT) is calculated sequentially, and the amount of change (ΔWT
) is larger than a set value for a set time, and the reference time (Ts) is defined as the reference time (Ts).
The batting action practice machine described. 4. The calculation processing means (31) calculates the load value (WT)
2. The ball batting motion training machine according to claim 1, wherein the reference time point (Ts) is defined as a point in time when T has continued to rise for a set time or more and then continues to fall for a set time.