JPH07250929A - Golf swing diagnostic machine - Google Patents

Abstract

PURPOSE:To provide a golf swing diagnostic machine capable of judging the appropriateness/inappropriateness of posture in swing and contributing to the improvement of the swing. CONSTITUTION:A load measuring board 1 on which a top board to place a trainee and to which three or more load cells 12, 13, 14 and 15 arranged under the edge part of the top board are provided and which supports the top board and which measures the load in the swing of the trainee from the detecting output W1, W2, W3 and W4 respectively of the load cells 12, 13, 14 and 15 is installed, and an arithmetic means 3 which finds the load center position of the trainee from the output of the load measuring board 1, and a display device 4 which performs the two-dimensional plane display of the load center position are provided in this golf swing diagnostic machine. Also, a storage means 33 or 35 which stores the data of a load center locus for comparison and a head detector 2 which detects impact time are provided, and the display device 4 is constituted so that the load center locus for comparison stored in the storage means 33 or 35 and the load center position at the impact time detected by the head detector 2 can be displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf swing diagnosing machine capable of diagnosing a skill of a subject and using it as a guideline for improving the skill by visualizing and displaying a weight shift during a golf swing.

[0002]

Foam is important for golf swings, and it is well known that movement of the center of gravity, so-called weight shift, is also an important factor. 2. Description of the Related Art Conventionally, in order to practice or improve a swing, a movement during a swing is recorded on a video tape and then repeatedly reproduced on a monitor television for analysis. In addition, paying attention to the left and right movement of the center of gravity, the left and right feet are placed on the load detectors and swung, and the movement status of the left and right load balances is displayed from the load measurement value measured at that time. It was Further, a device which outputs both of them to a TV screen at the same time is disclosed (Japanese Patent Laid-Open No. 62-44275).
. By the way, it was often said that the weight shift during a golf swing was a linear movement between the right foot and the left foot, but as a result of research, the center of gravity from the center of the both feet to the right foot between the address and the backswing was studied. Although it shifts linearly to the left, from the downswing to the impact, the center of gravity moves slightly toward the left foot while hanging on the tip of the toe rather than at the time of address, the trajectory of the center of gravity expands forward, and the center of gravity moves backward again. It turned out that the center of gravity at the moment of impact should be on the line connecting the centers of the left and right feet on the leftmost side of the trajectory. It is possible to clearly observe the drawbacks that are found in many golfers, such as sue and the fact that the weight shift during downswing is not smooth, by capturing the movement of the center of gravity over time and showing the trajectory projected on a plane. If golf swing training can be performed so that the locus of center of gravity obtained in this way matches the above-described exemplary pattern, the golf ability will be significantly improved. Therefore, a device that superimposes and displays the position of the center of gravity during a swing on an ideal trajectory map of the center of gravity is extremely useful for golfers in order to know where their own swing deviates from the ideal and to form an accurate swing. It becomes a useful swing practice assisting device. However, since the above-described conventional swing analysis device can only capture left and right one-dimensional movements, it is not useful for obtaining the two-dimensional barycentric position. Currently, it is possible for experts to use advanced measurement and analysis equipment,
For example, it was a system that analyzes by making full use of a load measuring device at the time of walking developed for rehabilitation, and was not used very daily.

[0003]

Therefore, the object of the present invention is to obtain the result of measuring the position of the center of gravity of a subject during a golf swing on an ideal center-of-gravity movement locus diagram.
It is displayed three-dimensionally to judge the quality of the posture during the swing,
It is an object of the present invention to provide a golf swing diagnostic machine that can be improved.

[0004]

In order to solve the above problems, a golf swing diagnostic apparatus of the present invention has a top plate on which a subject is placed and a load cell supporting the top plate in at least three corners.
A load measuring table which is installed individually and measures the load of the subject during the swing from the detection output of the load cell, a calculating means for obtaining the load central position of the subject at the present time from the output of the load measuring table, and the load central position are 2 A display device for displaying a three-dimensional plane, and storage means for storing data of a load center locus for comparison, and the display device displays the stored load center locus for comparison, and the load of the subject at the present moment It is characterized in that the measurement result of the center position is displayed in an overlapping manner. Further, a head detector is provided to detect the impact time and display the position of the center of gravity at this time on the display device. Further, another golf swing diagnostic apparatus of the present invention is characterized in that the calculating means corrects the comparative load center locus by using data of the stance and foot length of the subject. Further, it is characterized in that the arithmetic unit estimates the position of the subject's foot from the stance and foot length data, and the display device superimposes the position on the display.

[0005]

[Function] Since at least three load cells installed in the corners of the load measuring table serve as the fulcrum of the top plate, when the load is on the top plate, the center of gravity of the load is apportioned by the distance between the fulcrums. The applied load is applied to each load cell.
Therefore, the load of the subject can be directly calculated by using the output of the load cell in which the load of the table itself has been corrected in advance, and by proportionally proportionally dividing each detected output, the load center position can be obtained in the form projected on the horizontal plane. . For example, when the load cell is installed at the four corners of a square base, a simple proportional calculation is performed using the respective outputs to give the position of the center of gravity projected on the base. In addition, since the installation position of the load cell is not in an exact symmetrical position, the initial load applied to each load cell is different, and if the degree of output change when the load is applied is different, the output compensation value given in advance, By adjusting the weighting coefficient value, the correct projection position of the center of gravity can be obtained. Since this calculation is extremely easy for the mechanical calculation means provided in the calculation device, even when the subject moves on the table, the calculation result can be obtained in almost real time. Here, the load cell means a converter for measuring force or load, whose output is an electric signal, and various principles are put into practical use. A test subject holding a golf club is made to stand at approximately the center of the load measuring table, and a golf ball set on the tee in front of the table is hit. At this time, from the time when the address is started and the subsequent swing is started until the end of the swing when the club is shaken off, the load cell measurement output signal is sequentially input, the above calculation is performed, the center of gravity position is calculated, and the result is calculated. It can be displayed on a two-dimensional display device such as a CRT, a liquid crystal display, or a plasma display. At this time, the ideal center-of-gravity locus is displayed, and if the center-of-gravity position is displayed on top of it, the quality of the swing posture at that time can be determined from the viewpoint of the center-of-gravity position.
Also, when the subject tried the test and liked the result, this result was recorded separately as a center-of-gravity trajectory over the entire process, and when it was overlaid and displayed with new measurement results tried at another time, the best swing Adjustment is easy because the difference from the movement of the center of gravity when doing is clear. The position of the center of gravity at the moment of impact is an important indicator of the quality of the swing, but the subject cannot observe the display device at this moment. In the device of the present invention equipped with a head detector, the impact time is automatically detected and the position of the center of gravity at this time is displayed on the display device, so that the subject can judge the quality by looking at this after the swing. You can do it. The shape of the exemplary center-of-gravity locus used for comparison varies depending on the conditions of the swing, but in general, the standard shape fits the stance fully in the lateral direction and the center-of-gravity movement range when the center of gravity is applied forward in the forward direction. It is similar to the above and can be used sufficiently. If the calculation means corrects the comparative load center locus by using the stance and foot length data of the subject, it can be used as a golf swing diagnostic machine without preparing a large number of matching data. Also, if you take a stance on the subject load measuring table and stand up so that you can keep your weight on one leg, you can determine the standing position of the subject and the position of the center of gravity when the subject leans back and forth. Since the foot length is known from the above, it is convenient to judge the quality of the swing by superposing the foot position in the drawing.

[0006]

According to the golf swing diagnostic apparatus of the present invention, the measurement result of the center-of-gravity position during a swing is overlaid on an appropriate center-of-gravity locus diagram, so that the quality of the swing can be compared and determined with an appropriate center-of-gravity position. . Further, what can be compared with one's own best can be very effectively used, for example, for adjustment before play.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The golf swing training machine of the present invention will be described in detail below with reference to the drawings showing the embodiments. FIG. 1 is a plan view showing an arrangement relationship between a load measuring table and a head detector in one embodiment of the present invention, and FIG. 2 is an elevation view of the same. FIG. 3 is a view showing a display example on the display device of the device of the present invention. Further, FIG. 4 is a configuration example of the golf swing diagnostic machine, and FIG. 5 is a signal block diagram thereof.

In the present invention, a tea stand 25 is arranged in front of the load measuring table 1. 4 on the load measuring stand 1
A top plate 11 having four corners supported by individual load cells 12, 13, 14, and 15 is provided. At the position where the golf ball is set on the tee stand 25, a light receiver 21A is provided on the front side across the passage of the club head, and a corresponding light projector 21B is provided on the other side, and the passage of the club head is detected to detect the moment of impact. A head detector 2 having an impact detector 21 for detecting is provided.

The test subject has a club and the load measuring table 1
Take a stance by standing on the center of the top plate 11 above. Load cells 12, 13, 14, 1 at the four corners of the load measuring table 1
In No. 5, since the top plate load is canceled in advance by zero adjustment in the load converter 16, its outputs W1, W2,
The total WT of W3 and W4 is the weight of the subject on the top 11. Further, at this time, the output ratio of each load cell differs depending on the relationship between the position where the load is applied and the installation position of the load cells 12, 13, 14, and 15, and by performing back calculation from this position, the position where the load center of gravity is projected on the horizontal plane is calculated. I understand. 4 load cells 12, 13, 14,
If 15 is placed exactly at the four corners of the square,
With the load cell 12 in the upper left corner of the figure as the origin, the left-right direction component X and the front-back direction component Y of the position of the center of gravity expressed in units of the intervals between the load cells are: X = (W2 + W3) / WT Y = (W3 + W4) / WT Can be obtained from Load cell 12, 13, 1
Even when the arrangements of 4 and 15 are not square, it is possible to calculate the position of the center of gravity by bringing in a geometrically determined correction coefficient unique to each arrangement. In addition,
It is clear that the load should be measured at three points on the plane to calculate the position of the center of gravity, so it would be sufficient if three load cells were installed, but the calculation for calculation is complicated. I hate to be.

When the subject swings on the load measuring table 1 and moves, the output of each load cell fluctuates accordingly. Each of the outputs W1, W2, W3, W4 is a load converter 16 equipped with a measurement bridge circuit and an A / D converter, calculates a load measurement value in which the weight of the top plate 11 is compensated, digitally converts it, and outputs it. This is sequentially taken into the arithmetic unit 3 via the I / O interface 32. The center-of-gravity position X, Y of the subject can be tracked by the arithmetic processing means 31 in the arithmetic device 3 while operating according to the above equation. The result is displayed on the two-dimensional screen display device 4 via the I / O interface 32 as needed, and can be viewed by the subject during the swing. The control console 34 is used for managing calculation programs and setting measurement parameters.

FIG. 3 shows an example in which the current center-of-gravity position is superimposed and displayed on a plane projection view of a typical center-of-gravity locus. The positions of the left foot LF and the right foot RF are shown by dotted lines. The foot position is
Although it is extremely easy to determine if it corresponds to the position drawn on the top 11 in advance, it is obtained from the load measurement result when the subject actually puts his / her weight on only one leg at the position where he / she actually took the stance. You can also

When analyzed from the results of many players' attempts, the locus of the center of gravity when a desirable swing is made is as follows.
When the stance is taken for the first time, the center of gravity is approximately at the midpoint A between the left and right feet, and when the backswing is started, this moves almost linearly toward the right foot RF and reaches the inside of the right foot RF. Is the rightmost end B, and the downswing starts from there. Since the center of gravity is slightly applied to the toes during the downswing, the center of gravity locus moves to the left and draws a gentle arc forward. This arc has the most bulging shape at the front position C of the body, and returns toward the front again as the club head approaches the tee position, and at the leftmost end D of the arc, around the center side of the left foot LF, the left and right feet. Reach the line connecting the.
It is preferable to make an impact here. In the follow-swing after impact, the center-of-gravity locus ends with a natural small circle behind the left foot LF.

The above is a typical center-of-gravity locus, and even if the club and the flight distance are different, the basic pattern does not change significantly. It was found that if the X direction of the standard pattern is expanded to the stance width DS and the Y direction is expanded to almost half of the foot length W, the ideal pattern substantially matches this regardless of the difference between clubs. Here, the foot length W is the difference in the center-of-gravity position in the front-rear direction when the weight is applied to the front and the rear with the stance taken. Therefore, the standard pattern is stored in the internal storage means 33 or the external storage device 35, read out as necessary, corrected with the data of the stance width DS and the foot length W of the subject, and displayed on the display device 4. If the position of the center of gravity P at each time is superimposed and drawn on this, it is possible to clearly know and correct the defect in the swing posture of the player.

Although the subject cannot observe the display device 4 at the moment of impact, the impact detector 21 installed at the tee position detects the moment when the head passes or the ball disappears, so that the moment of impact is detected. The barycentric position I at this time is automatically detected and kept displayed on the display device 4 until it is reset. Therefore, the subject can judge the quality by looking at it after the swing. I can. When a switch 23 is provided at an appropriate position on the head detector 2 and a reset instruction signal is transmitted by touching the club head,
This is convenient because the subject can operate it without changing the stance posture.

The strictly optimum trajectory, for example, the trajectory at which the head speed is maximized, varies slightly depending on the person and the conditions. Even for the locus during the downswing, it is better for some people to form a wide base triangle having an apex instead of a gentle arc. Of course, the optimum pattern changes depending on the number of the swinging club and the flight distance to be aimed. Thus, although the optimum pattern changes depending on the person, the center of gravity trajectory in the person's own best swing under certain conditions is reproducible, so the center of gravity trajectory measured by the device of the present invention is the best. It's a good indicator to see if you are swinging. Therefore, in the case where the test subject makes a best swing that he or she wants to try and use as his own standard, this is recorded in the storage means such as the internal storage means 33 or the external storage device 35 as the center of gravity trajectory. , When measuring and displaying the swing, selecting an appropriate trajectory and displaying them together in the same manner as above will not only improve the player's skill, but also adjust the tone just before playing. It becomes a useful device.

In the above diagnosis, the relationship between the address start point position A and the left and right foot positions RF and LF, the back swing center of gravity movement trajectory BS, the relationship between the forward displacement H of the center of gravity during the downswing and the foot length W. , It is known that the characteristics of the swing can be well represented by using the indexes such as the center-of-gravity return width FS of the follow swing, the center-of-gravity position I at the time of impact, and the swing can be evaluated using these indexes. For example,
When the center of gravity moves close to the outside of the right foot RF and the backswing's center of gravity moves too long, a sway occurs, so you should practice to stop inside your foot, and the center of gravity locus should be on both feet RF, LF. If the lateral length of the center-of-gravity locus is not wide enough to spread right and left in the middle part of the body, the backswing does not shift the weight enough to the right and the downswing is performed, and the weight remains after the impact. You need to increase your weight transfer a bit more to show that you are remaining.

In the above description, the device and the orientation of the body are limited to the left and right, but it is needless to say that the head detector 2 can be used as it is for a left-handed subject by arranging it in reverse. Further, reference numerals are attached to the drawings in the description of the claims, but these are attached for the purpose of facilitating understanding, and do not limit the technical idea of the present invention. Needless to say.

[Brief description of drawings]

FIG. 1 is a plan view of a golf swing diagnostic machine.

FIG. 2 is a side view of the golf swing diagnostic machine.

FIG. 3 is a diagram showing a display example of a display device in a golf swing diagnostic machine.

FIG. 4 is a perspective view of a golf swing diagnosis machine.

FIG. 5 is a block diagram of a golf swing diagnostic machine.

[Explanation of symbols]

1 load measuring table 2 head detector 3 computing means 4 display device 11 top plate 12, 13, 14, 15 load cell 33, 35 storage means DS stance I load center position at impact point P load center position W foot length W1, W2 W3, W4 Detection output WT load

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Kimura 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Kubota Technology Development Laboratory Co., Ltd.

Claims (3)

[Claims] 1. A top plate (11) on which a subject is placed and three or more load cells (12), (13), () arranged below the peripheral edge of the top plate (11) and supporting the top plate (11). 1
4) and (15) are installed, the load cell (1
2), (13), (14), (15) detection output (W
1), (W2), (W3), and (W4), the load measuring table (1) for measuring the load (WT) of the subject during the swing, and the load center position of the subject from the output of the load measuring table (1). A golf swing diagnostic machine provided with a computing means (3) for obtaining (P) and a display device (4) for displaying the load center position (P) in a two-dimensional plane. A storage means (33) or (35) for storing data and a head detector (2) for detecting an impact time point are provided, and the display device (4) includes the storage means (33) or (3).
5) A golf swing diagnostic machine configured to display the comparative load center locus stored in 5) and the load center position (I) at the time of impact detected by the head detector (2). 2. The calculation means (3) is configured to correct the comparative load center locus by using the stance (DS) and foot length (W) data of the subject.
The described golf swing diagnostic machine. 3. The display device (4) is configured to superimpose and display the position of the subject's foot obtained by allowing the subject to take a posture on the load measuring table (1). 1
Alternatively, the golf swing diagnosis machine according to 2 above.