JP2644687B2 - Golf swing diagnostic 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 top plate on which a subject is to be placed and which is disposed below the periphery of the top plate to support the top plate.
A load measuring table on which at least two load cells are installed, an arithmetic unit for calculating the position of the center of gravity of the load on the top plate from the load detection output of the load cell, and a locus of the position of the center of gravity is displayed as a two-dimensional projection. The present invention relates to a golf swing diagnostic machine provided with a display device.

[0002]

2. Description of the Related Art It is well known that the form of golf swing is generally important, but the shift of the center of gravity, so-called weight shift, is also an important factor. Conventionally, the display panel of the display device that displays the locus of the center of gravity of the load due to the test of the subject is configured to be able to insert or attach a standard pattern in which the locus of the center of gravity to be compared is drawn. Then, insert or paste the standard pattern on the display board,
The trajectory of the position of the center of gravity of the load by the test of the subject is displayed on the display panel, and the two are compared to diagnose the quality of the swing (for example, Japanese Patent Application Laid-Open No. Sho 50-2).
No. 6571).

[0003]

The trajectory of the position of the center of gravity of the optimum load varies from person to person, and also depends on the number of the club to swing and the swing conditions such as the required flight distance. However, in the conventional golf swing diagnostic device, it is necessary to create a standard pattern according to people and conditions.
Each time, it was necessary to insert or attach a standard pattern to the display board, which was very complicated. Therefore, an object of the present invention is to provide a golf swing diagnostic apparatus that can easily compare the locus of the center of gravity position by the test of the subject with the locus of the center of gravity position for comparison.

[0004]

The golf swing diagnostic apparatus according to the present invention is characterized in that a storage means is provided for storing a locus of the center of gravity of the load by the test of the subject as a locus of the center of gravity for comparison. That is, when displaying the locus of the new center of gravity of the subject, the comparative center of gravity position locus stored in the storage means is displayed in a superimposed manner.

[0005]

According to the above-mentioned characteristic configuration, when the subject performs a trial, the locus of the center of gravity of the load under the swing condition at that time can be stored in the storage means as the comparative center of gravity position locus. At a time different from the time when the center of gravity position locus is stored in the storage means, when the subject performs a trial, the locus of the new center of gravity position at that time, and the comparative center of gravity position locus stored in the storage means Can be displayed on the display device in an overlapping state. For example, when the subject performs a trial and the result is favorable, the measurement result is stored in the storage means, and is displayed together with a new measurement result tried at another time. Since the difference from the state of movement of the center of gravity becomes clear, adjustment is easy.

The position of the center of gravity of the subject is calculated by the arithmetic unit as follows. That is, since at least three load cells installed at the corners of the load measuring table serve as fulcrums of the top plate, gravity is applied to the load cells such that the center of gravity of the load is proportionally divided according to the distance between the fulcrums. Accordingly, by inversely proportionally dividing the respective detection outputs, the center position of the load applied to the table can be obtained. At this time, if the load of the table itself is corrected, the position of the center of gravity of the subject is obtained in a form projected on a horizontal plane. The load and the position of the center of gravity can be accurately obtained by using three load cells, but the calculation formula becomes slightly complicated and the stability of the top plate deteriorates. On the other hand, when the load cell is precisely placed at the four corners of the square and the table is placed on it, the position of the center of gravity projected on the table is calculated by a simple proportional operation using the respective outputs. Is easily given. In addition,
Even if four load cells are arranged, even if the installation position is not at the exact symmetrical position, the initial load applied to each load cell is different, and the degree of output change when the load is applied is different, By adjusting the output compensation value and the weight coefficient value given in advance, a correct projection position of the center of gravity can be obtained. Since this calculation is extremely easy for the machine calculation means provided in the calculation device, even when the subject moves on a table, the calculation result can be obtained almost in real time. Here, the load cell broadly means a load detection end, and does not necessarily need to be based on a strain gauge. The subject holding the golf club stands almost at the center of the load measuring table, and hits a golf ball set on, for example, a tee in front of the table. At this time, during the period from the time when the address is started to swing after the swing to the time when the swing is completed after the club has been swung, the measurement output signal of the load cell is sequentially input, the above calculation is performed, and the moving state of the center of gravity is calculated. Can be displayed on a two-dimensional display device such as a CRT, a liquid crystal display, or a plasma display, or a display device including a two-dimensional recording device such as a plotter or a printer.

[0007]

Therefore, according to the above-mentioned characteristic configuration, it is not necessary to prepare a standard pattern and insert or attach the standard pattern to the display board, which is required in the past. The comparison with the locus of the position of the center of gravity for comparison can be easily performed. For example,
If the measurement result at the time of the best swing is stored in the storage means as the comparative center of gravity position trajectory, it can be compared with the best of the user, so that it can be used very effectively for adjustment before play, for example. Things.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a golf swing diagnostic apparatus according to the present invention. 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 thereof. FIG. 3 and FIG. 4 are views showing an example of a measurement result by the golf swing diagnostic device. FIG. 5 is a configuration example of a golf swing diagnostic device,
FIG. 6 is the signal block diagram.

In the present invention, a tea stand 25 is provided in front of the load measuring table 1. The load measuring table 1 has 4
A top plate 11 having four corners supported by load cells 12, 13, 14, 15 is provided. The tee stand 25 is provided with a light receiver 21A on the near side of the club head passage at the position where the golf ball is set and a corresponding light emitter 21B on the other side to detect the passage of the club head and detect the moment of impact. Impact detector 2
1 and a light receiving unit 22A and a light emitting unit 22B installed in the same manner as described above at a position slightly to the right of the ball set position and at a position where the club head always passes at the start of the backswing after addressing, and detects the start of the backswing. Swing detector 22 is provided.
A head detector 2 provided with a push button 23 is provided between A and 22A. Since it is natural to use tees for clubs with low numbers, tees can be provided at the ball set position.

The subject has a club and the load measuring table 1
Above, stand almost in the center of the top plate 11 and take a stance. Load cells 12, 13, 14, 15 at the four corners of the load measuring table
Since the top plate load has been canceled in advance by zero adjustment in the load converter 16, the outputs W1, W2, W
The total WT of W3 and W4 is the weight of the subject on the tabletop. Further, at this time, the output ratio of each load cell is different depending on the relationship between the position where the load is applied and the installation position of the load cell, and the position where the load is applied, that is, the position where the center of gravity is projected on the horizontal plane can be found by performing the back calculation. . When the four load cells 12, 13, 14, and 15 are accurately arranged at the four corners of the square under the top plate 11, the load cell 12 at the upper left corner in FIG. Can be obtained from the following equation: X = (W2 + W3) / WT Y = (W3 + W4) / WT Even when the arrangement of the load cells is not square, the position of the center of gravity can be calculated by introducing a geometrically determined correction coefficient specific to each arrangement.

When the subject swings and moves on the load measuring table 1, each load cell output fluctuates accordingly. Each output W1, W2, W3, W4 is a load converter 16 provided with a measuring bridge circuit and an A / D converter, calculates a load measurement value compensating for the weight of the top plate 11, digitally converts and outputs, These are sequentially taken into the arithmetic unit 3 via the I / O interface 32. The weight change observed due to the acceleration of the center of gravity due to the vertical movement of the subject and the change in the center of gravity as a complex with the club head, and the center of gravity of the subject (X, Y) are calculated by the arithmetic unit 3. The tracking can be performed by the processing means 31 while calculating according to the above equation. The result is stored in the internal storage means 33 constituted by an IC memory or the like, and is displayed on the display device 4 via the I / O interface 32 as necessary, so that the subject can see the result during or after the swing. Further, the data can be output to an external storage device 35 composed of a magnetic disk, a compact disk, or the like, and can be recorded on a magnetic recording medium or an optical recording medium.

The test subject confirms that the golf swing diagnostic machine is in a state where the golf swing diagnostic machine can be operated with an indicator lamp, a display or the like, and then sends a start signal to start the attempt to the apparatus.
The start signal is transmitted to the push button 2 provided for the head detector 2.
If the club head 3 is generated by pushing it with the club head, it is convenient because the posture immediately before the address is not changed and the subject can input by himself. Of course, a mechanism that emits a signal when the club head is brought close to a certain place,
It is also possible to use a manual push, a remote switch, or the like, or to substitute a preparation end signal generated by the golf swing diagnostic machine itself. Next, after the club head is addressed to the left of the swing detector 22, the backswing starts. At this time, the club head blocks the light beam emitted from the projector 22B of the swing detector, and
By interrupting the 2A light detection, a swing start detection signal is generated. The emitted light and the received light are preferably thin beams having high directivity under the condition that the light incident on the light receiver 22A can be shielded by the club head, and as a line type, it is preferable to select an infrared ray that is hardly present in the surrounding environment. preferable. As the head detector 2, various other detection methods such as using a magnetic material such as an iron piece in a club head and detecting the passage by a detection coil provided on the tee stand side, using an ultrasonic wave, and the like. The principle is available. In addition,
Contrary to the above, since the club head is detected first and the head disappears when the swing starts, a method of knowing the start of the swing is also used.

The detection signal serves as a trigger for the arithmetic unit 3 via the I / O interface 32 in the arithmetic unit, and thereafter, the arithmetic processing means 31 sequentially obtains the position of the center of gravity by the calculation of the above equation. The calculation result of the position of the center of gravity is stored in the internal storage device 33, and if necessary, the two-dimensional screen display device 41, the two-dimensional recording device 42 or the external storage device 3
5 to be useful for the determination. The control console 34 is used for management of operation programs and setting of measurement parameters.

FIG. 3 is an example showing a plan view of a typical center of gravity locus. The positions of the left foot LF and the right foot RF are indicated by dotted lines. Analyzing from the results of the attempts of many players, the trajectory of the center of gravity at the time of making a preferable swing is, first, when the stance is first taken, the center of gravity is almost at the middle point P2 of the left and right feet, and when the backswing starts, This almost linearly moves toward the right foot, and reaches the inside of the right foot RF as the rightmost end, from which a downswing starts. During the downswing, the center of gravity is slightly applied to the toe, and the locus of the center of gravity draws a gentle arc forward while moving to the left. This arc has the shape that is most inflated at the front position of the body, and returns again toward the front as the club head approaches the tee position. It reaches P1 on the straight line. It is preferable to make an impact here. In the follow swing after the impact, the center of gravity trajectory ends with a natural small circle drawn inward and backward of the left foot LF.

The above is a typical center-of-gravity locus. Even when clubs and flight distances are different, there is no significant change in the basic pattern. However, the optimum trajectory, for example, the trajectory at which the head speed is maximized, varies somewhat from person to person and from condition to condition. For some trajectories during a downswing, it is better to form a wide-base triangle having vertices instead of a gentle arc. Of course, the optimum pattern changes depending on the number of the club that swings and the flight distance to be aimed at. Thus, depending on the condition by the person
Although the optimal pattern changes, 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 present device is:
It is a good indicator to find out if you are on the best swing. Therefore, when measuring and displaying the swing, if the trajectory of the person's best swing is displayed together,
This device is useful not only for improving the skill of the player but also for adjusting the tone immediately before the play.

FIG. 4 shows X-direction components X and Y of the change in the position of the center of gravity.
The directional component Y and the change W of the load are displayed on the time axis together with the vertical line P1 representing the time of impact. In the embodiment, it is observed through the display device 4. The backswing changes relatively slowly until the movement of the center of gravity reaches the maximum value in the lateral direction of the body, that is, the X direction. The downswing can be considered to be up to the impact, and is set to a point separated by a vertical line P1 written by a signal of the impact detector 21. Since the moving speed of the center of gravity during this period gradually increases from the start of the downswing, X
It is preferable that the amount of change in the direction is large and the impact is reached at the maximum value on the left side. In addition, in the Y direction, the weight shifts to the front in accordance with the weight being slightly applied to the toe, and takes the largest value in the vicinity of the center in the X direction and crosses the initial value in the vicinity of the impact. A good swing. In the follow swing, after the Y value once reaches the rear maximum value, the swing swings behind the initial Y value, and the X value once swings rightward in the forward direction. First, the time required to reach the extreme value and the distance on the X coordinate from the left extreme value are related to the quality of the swing form and are important. In addition, the load decreases from the latter half of the backswing as the club head is lifted, and begins to increase when entering the downswing,
It increases rapidly as the head speed increases. Since the load at the moment of impact affects the head speed, it is preferable that the maximum value is obtained at the moment of impact.

From the above, the center of gravity trajectory, the distance and time of the center of gravity movement during the backswing, the distance and time of the center of gravity movement of the downswing, the width and time of the center of gravity movement of the follow swing,
The horizontal length of the center of gravity locus and the width in the vertical direction, that is, the difference between the Y value of the address start point P2 and the Y value when the center of gravity is deviated most forward during downswing, the center of gravity at impact, the load, and the load change at swing. It was found that the characteristics of the swing can be well represented by using the indicators such as. For example, when the center of gravity moves to near the outside of the right foot RF and the moving distance of the center of gravity of the backswing is too long, sway occurs, and the center of gravity trajectory is not fully spread right and left at the middle part of both feet and the center of gravity trajectory When the lateral length is small, it indicates that the player enters the downswing before the weight is sufficiently shifted to the right in the backswing, and that the weight remains on the right foot even after the impact.

A portion of the lower surface of the top plate 11 that contacts the load cell is formed as a depression so that the contact position of the pressure receiving member of the load cell does not change even when the top plate is tilted.
1 is tilted, the load cells 12, 13, 14, 15
If the posture of the load measuring table changes so that the pressure receiving direction is maintained vertically, the load measuring table can be tilted appropriately, and the swing on the slope can be simulated. Useful for trouble shooting practice.

In the above description, the apparatus and the orientation of the body are limited to the left and right. However, it goes without saying that the left-handed subject can be used as it is if the head detector is arranged in reverse.

In the description of the claims, reference numerals referring to the drawings are attached, which are attached for the purpose of facilitating understanding, and thereby restrict the technical idea of the present invention. It goes without saying that it is not.

[Brief description of the drawings]

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

FIG. 2 is a side view of a golf swing diagnostic device.

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

FIG. 4 is a diagram showing a display example of a display device in the golf swing diagnostic machine.

FIG. 5 is a perspective view of a golf swing diagnostic device.

FIG. 6 is a block diagram of a golf swing diagnostic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load measuring table 3 Computing device 4 Display device 11 Top plate 12, 13, 14, 15 Load cell 33 Storage means

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Takashi Kimura 1-1-1 Hama, Amagasaki-shi, Hyogo Kubota Technology Development Laboratory Co., Ltd. (56) References JP-A-60-24864 (JP, A) 48-50745 (JP, A) JP 50-26571 (JP, A) JP 7-41088 (JP, B2)

Claims (1)

(57) [Claims] 1. A top plate (11) on which a subject is placed and three or more load cells (12), (13), (13) arranged below the periphery of the top plate (11) and supporting the top plate (11). 1
4) A load measuring table (1) on which (15) is installed; and the load cells (12), (13), (14), (1).
An arithmetic unit (3) for calculating the position of the center of gravity of the load on the top plate (11) from the load detection output of (5), and a display device (4) for displaying the trajectory of the position of the center of gravity as a two-dimensional projection. A storage device (33) for storing a trajectory of a center of gravity of a load by a test of a subject as a trajectory of a center of gravity for comparison, wherein the display device (4) includes a new center of gravity of the subject. A golf swing diagnostic machine configured to superimpose and display the comparative center-of-gravity position locus stored in the storage means (33) when displaying a locus of position.