JPH0741087B2 - Golf swing diagnostic machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a golf swing diagnosis in which the skill of a subject can be diagnosed by visualizing and displaying the movement of weight during a golf swing, and can be used as a guideline for skill improvement. Regarding the machine.

[Conventional technology]

Foam is generally important for golf swings, but 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, a motion during a swing is recorded on a video tape and then repeatedly reproduced on a monitor TV 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 for simultaneously outputting both of them on a television screen 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 recent research, the center of gravity is exactly at the center of both feet between the address and the backswing. From the downswing to the impact, the center of gravity moves toward the left foot while being slightly closer to the toe than at the time of address, so the trajectory of the center of gravity swells forward,
Later, the center of gravity moved to the back again, and it became clear 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. In situations where the weight shift on down swings is not smooth, which is a drawback seen in many golfers, by capturing the movement of the center of gravity in a time series and projecting and showing its trajectory on a plane,
It can be clearly observed. 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, the device that obtains and displays the trajectory of the center of gravity during a swing becomes an effective swing diagnostic device, and becomes a swing practice assisting device that is extremely useful for many golfers. However, since the swing analysis device can only capture left and right one-dimensional movements, it is not useful for obtaining the center of gravity trajectory. At present, what can be used for the above purpose is a system in which an expert makes full use of an advanced measurement and analysis device, and it has not been used very daily.

[Problems to be Solved by the Invention]

Therefore, an object of the present invention is to provide a golf swing diagnostic machine that measures the trajectory of the center of gravity of a subject during a golf swing, displays it two-dimensionally, and helps determine the quality of the swing. That is. It is another object of the present invention to provide a golf swing diagnosis machine that easily and accurately diagnoses the quality of a swing by calculating and displaying a characteristic value expressing the characteristics of the swing from the trajectory of the center of gravity movement during the golf swing.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the first invention of the present application is a golf swing diagnostic machine provided with a top plate on which a subject is placed and a load measuring table provided with three or more load cells supporting the top plate on the lower side of the peripheral edge thereof. A head detector having detectors for detecting club head passage at a golf ball setting position and a club head address position, a load measurement output of a load cell of the load measuring table, and a detection output of the detector From the above, an arithmetic device for calculating the position of the center of gravity of the load on the top plate during the swing, the trajectory of the position of the center of gravity are displayed as a two-dimensional plane projection diagram, and the position of the center of gravity at the backswing start point and the impact point is shown in the figure. Is provided with a display device for displaying.

A second aspect of the present invention includes a storage device that stores a measurement result obtained by the subject's trial, and the display device displays the storage information of the storage device in a superimposed manner with the measurement result when displaying a new measurement result. It is characterized in that it is configured to.

A third aspect of the invention is characterized by including a computing device that computes the characteristic value of the locus of the center of gravity of the subject from the load measurement output of the load cell of the load measuring table, and a display device that displays the result.

In a fourth aspect, the characteristic value of the center-of-gravity locus to be calculated and displayed is a lateral distance and time of center-of-gravity movement during a backswing, a lateral distance and time of center-of-gravity movement during a downswing, and a vertical movement width, It is characterized by including any one of the vertical distance of the movement of the center of gravity during the follow swing, the position of the center of gravity at the time of impact, and the load.

[Work]

 The operation of the first invention of the present application is as follows.

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 by proportionally dividing the center of gravity of the load by the distance between the fulcrums. Therefore, if the respective detected outputs are inversely proportionally distributed, 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 can be obtained in a form projected on the horizontal plane. The center of gravity of the load is determined by the three load cells.
It can be calculated accurately, but the calculation formula becomes slightly complicated and the top plate becomes less stable. On the other hand, when the load cells are accurately placed at the four corners of the square and the table is placed on the four corners, the position of the center of gravity projected on the table is calculated by a simple proportional calculation using each output. Is easily given. Even if four load cells are arranged, the installation position is not in an 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. Also, the projection position of the center of gravity can be correctly obtained by adjusting the output compensation value and the weighting coefficient value given in advance. 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 widely means a load detection end, and need not necessarily be a strain gauge.

A test subject holding a golf club is made to stand in the approximate 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 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. CR
2 such as T, liquid crystal display, or plasma display
It can be displayed on a three-dimensional display device or a display device including a two-dimensional recording device such as a plotter or a printer.

By the way, it is necessary to give a start command for starting the calculation of the center-of-gravity position to the arithmetic device, but it would be inconvenient if a person gives the calculation start command to this arithmetic device.

In addition, it is possible to judge the quality of the swing at the time of the attempt from the center of gravity locus displayed on the display device. However, in the case of actually using the judgment, the part where the body moves before and after the swing motion and the part during the swing motion are shown. The loci of must be displayed separately. In order to specify the part before the start of the swing motion, if the person inputs the signal to start the swing at a timing, the subject making the swing cannot operate the traffic light, so be sure to use the assistant. There is an inconvenience that you need.

The head detector provided in the apparatus of the present invention includes a transmission type or reflection type optical detector, an air back pressure measuring device, a magnetic sensor or a contact sensor, and a club head for addressing. It monitors the movement of the club head. Then, based on the detection of the club head passage by the detector, a calculation start command is given to the arithmetic unit and a swing start signal is inputted.

Therefore, it is possible to give a calculation start command to the arithmetic unit without manual operation, and it is possible to accurately specify the start time of the backswing without manual operation. By the way, when making a golf swing, it is usual to perform waffles before the start of the backswing in order to relieve the tension, but the test subject should be careful not to let the detector detect head passage. Even if the waffle is performed before the start of the swing, the start point of the backswing can be accurately specified.

When the trajectory of the position of the center of gravity of the subject, which is sequentially calculated by the above method, is displayed as a two-dimensional plane projection view from this start point, the trajectory before entering the swing is removed,
A projection drawing of the center-of-gravity movement trajectory of only the part related to the swing can be obtained, and the backswing start time can be displayed by entering a symbol in the figure or distinguishing the target trajectory part by color. Therefore, it is preferable that the quality of movement of the center of gravity can be clearly evaluated and determined particularly in the initial stage of the swing.

At the ball set position on the head detector, a detector similar to the detector for detecting the backswing is provided so as to detect the passage of the club head, and detects the impact time point. The center-of-gravity position is displayed in the center-of-gravity movement trajectory diagram. As described above, the movement of the center position of the body weight at the time of impact and before and after the impact becomes the most important index of the quality of the swing. Greatly improve the.

The swing motion ends with a follow swing, and this follow swing also greatly affects the quality of the swing.From the standpoint of determining the quality of the swing based on the condition of weight movement, it is sufficient to know the state up to the middle of the swing. is there. Therefore, it is not necessary to know the exact end time of the follow swing, and the display of the trajectory map may be terminated after an appropriate time from the impact time.

The operation of the second invention is as follows.

When the subject makes a try and the result is favorable, this result can be recorded separately and displayed together with the new measurement result that was tried at another time, so the center of gravity of the best swing Adjustment is easy because the difference from the movement situation becomes clear.

The operations of the third and fourth inventions are as follows.

It is possible to calculate characteristic values that can express the characteristics of the swing from the locus of the center of gravity of the subject measured by the load measuring stand, and display the results, so the parameters that are known to be useful as indicators are directly presented. Therefore, anyone can quantitatively grasp the degree of suitability of the swing, and the reliability of diagnosis of the golf swing diagnosis machine is enhanced. The display in this case is not limited to the two-dimensional display device, but a bar display or a numerical expression can be sufficiently used.

〔The invention's effect〕

According to the golf swing diagnostic apparatus of the present invention, it is possible to measure the state of movement of the center of gravity during the swing without the need for an assistant's hand, and it is possible to determine the quality of the swing of the subject from the viewpoint of the appropriateness of movement of the center of gravity. In addition, the judgment given by the diagnostic machine is quantitative and can be used as an objective index. Further, what can be compared with one's own best can be very effectively used, for example, for adjustment before play.

〔Example〕

Hereinafter, a golf swing diagnostic apparatus of the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 shows 1 of the present invention.
FIG. 2 is a plan view showing the positional relationship between the load measuring table and the head detector in the embodiment, and FIG. 2 is an elevational view. FIG. 3 and FIG. 4 are drawings showing an example of the measurement results by the golf swing diagnostic machine. Further, FIG. 5 is a configuration example of a golf swing diagnosis machine, and FIG. 6 is a signal block diagram thereof.

In the present invention, the tea stand (25) is arranged in front of the load measuring table (1). 4 on the load measuring stand (1)
A top plate (11) whose four corners are supported by individual load cells (12), (13), (14), (15) is installed. The tee stand (25) has a light receiver (21A) on the front side across the club head passage where the golf ball is set,
An impact detector (21) equipped with a corresponding light projector (21B) on the other side to detect the passing of the club head to detect the moment of impact, and a backswing after address and slightly to the right of the ball set position At the position where the club head always passes, a swing detector (22) that detects the start of the backswing, which is composed of a light receiver (22A) and a light projector (22B) installed in the same manner as above, is provided.
Further, a head detector (2) having a push button (23) is arranged between the light receivers (21A) and (22A). Since it is natural to use a tee for a club having a low club number, a tee can be installed at the ball set position.

The test subject holds a club and stands on the load measuring table (1) while standing substantially at the center of the top plate (11). Load cells (12), (13), (14), (1 at the four corners of the load measuring table
In 5), since the top plate load is canceled in advance by zero adjustment in the load converter (16), its output (W1),
The total (WT) of (W2), (W3), and (W4) is the weight of the subject on the tabletop. Furthermore, 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 cell, and by performing back calculation from this position, the position where the load is applied, that is, the position where the center of gravity is projected on a horizontal plane. I understand. 4 load cells (12),
(13), (14) and (15) are square 4 under the top plate (11).
In the case of accurate placement in the corners, the load cell (12) in the upper left corner of FIG. 1 is used as the origin, and the left-right direction component X and the forward-backward direction component Y of the center of gravity position expressed by the interval between the load cells as a unit. Can be obtained from X = (W2 + W3) / WT Y = (W3 + WS) / WT.

Even if the load cells are not arranged in a square shape, the position of the center of gravity can be calculated by bringing in a correction coefficient geometrically determined, which is unique to each arrangement.

When the subject swings and moves on the load measuring table (1),
Along with that, the output of each load cell changes.
Each of the outputs (W1), (W2), (W3), (W4) is a load converter (16) equipped with a measuring bridge circuit and an A / D converter, and the load measurement is performed by compensating the weight of the top plate (11). The value is calculated, digitally converted, and output, which is 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 of the center of gravity position as a complex with the club head, and the center of gravity position (X, Y) of the subject are calculated in the arithmetic unit (3). By the arithmetic processing means (31), it is possible to trace while performing arithmetic operation according to the above formula. The result is stored in an internal storage means (33) composed of an IC memory or the like, and is displayed on a display device (4) via an I / O interface (32) as needed, and the subject is examined during or after the swing. Can be seen. Further, it can be output to an external storage device (35) composed of a magnetic disk, a compact disk or the like and recorded in a magnetic recording medium or an optical recording medium.

The test subject confirms that the golf swing diagnosis machine is in an operable state by a display lamp, a display, or the like, and then sends a start signal for starting a trial to the device. The start signal is generated by pressing the push button (23) also provided for the head detector (2) by the club head, and the subject can input the start signal without disturbing the posture immediately before the address. It is convenient. Of course, it is also possible to use a mechanism that emits a signal when the club head is brought close to a certain place, a stepping, hand pushing, or a remote switch, or it can be substituted with a preparation completion signal generated by the golf swing diagnosis machine itself. is there.

Next, after addressing the club head to the left side of the swing detector (22), the backswing is started. At this time,
A swing start detection signal is generated by the club head interrupting the light emitted from the projector (22B) of the swing detector and interrupting the light detection of the light receiver (22A). For the emitted and received rays, a thin beam with high directivity is preferred, provided that the ray incident on the light receiver (22A) can be blocked by the club head. Also, as the line type, select infrared rays that do not easily exist in the surrounding environment. Is preferred. In addition to this, as the head detector (2), a magnetic material such as an iron piece is charged in the club head, and the passage is detected by a detection coil installed on the tee stand side, or ultrasonic waves are used. Various detection principles can be used. On the contrary to the above, a method of detecting the start of the swing is also used because the club head is detected first and the head disappears when the swing starts.

The above detection signal is the I / O interface (3
It becomes a trigger for the arithmetic unit (3) via 2),
After this time, the arithmetic processing means (31) successively finds the barycentric position 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 recording device (42) or the external storage device (35).
It is possible to output the result to the judgment and be useful for the judgment. The control console (34) is used for managing arithmetic programs and setting measurement parameters.

FIG. 3 is an example showing a plane projection view of a typical trajectory of the center of gravity. The positions of the left foot (LF) and the right foot (RF) are indicated by dotted lines.

Analyzing from the results of many players' trials, the locus of the center of gravity when making a favorable swing is that when the stance is taken for the first time, the center of gravity is approximately the midpoint between the left and right feet (P
In 2), when you start a backswing, it moves to the right foot almost linearly, and when you reach the area around the inside of the right foot (RF), you make the rightmost end, and then enter the downswing. 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 in the front position of the body, and it returns to the front as the club head approaches the tee position, and at the left end of the arc, it is the middle of the left foot (LF), the left and right feet. Reach the line connecting (P1). It is preferable to make an impact here. On the post-impact follow-swing, the center of gravity locus ends with a natural small circle behind the left foot (LF).

The above is a typical trajectory of the center of gravity, and even if the club and the flight distance are different, the basic pattern does not significantly change. However, the optimum locus, for example, the locus at which the head speed is maximized, differs somewhat 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 club to swing and the flight distance to be aimed.

As described above, 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, when measuring and displaying the swing, if the loci of the person's best swing are overlapped and displayed together, it is not only useful for improving the skill of the player, but also useful for adjusting the tone just before playing. become.

FIG. 4 shows the X-direction component (X) and the Y-direction component (Y) of the change of the position of the center of gravity and the change (W) of the load on the time axis together with the vertical line (P1) representing the time of impact. Is. In the example, it is viewed through the display device (4).

The backswing moves relatively gently until the movement of the center of gravity reaches the maximum value in the lateral direction of the body, that is, in the X direction.

Downswing can be thought of as impact,
It is up to the point separated by the vertical line (P1) entered by the signal of the impact detector (21). Since the center-of-gravity movement speed during this period gradually increases from the start of the downswing, the amount of change in the center of gravity in the X direction becomes large, and it is preferable to reach the impact at the maximum value on the left side. Also in the Y direction,
As the weight is slightly applied to the toes, the center of gravity moves in the forward direction, the maximum value is obtained around the center of the X direction, and the initial value is crossed at the impacting point, resulting in the best swing. .

In the follow swing, after the Y value once reaches the rear maximum value, the follow swing oscillates rearward from the initial Y value, and the X value once swings back to the right in the positive direction. The time required to reach the extreme value first and the distance on the X coordinate from the left extreme value are important because they are related to the quality of the swing form.

In addition, the load decreases from the latter half of the backswing as the club head is lifted, begins to increase when the club enters the downswing, and increases rapidly as the head speed increases. Since the load at the moment of impact influences the head speed, it is preferable that the maximum value be obtained at the moment of impact.

From the above, the center of gravity locus, the distance and time of movement of the center of gravity during backswing, the distance and time of movement of the center of gravity of the downswing, the width and time of movement of the center of gravity of the follow swing, the lateral length of the center of gravity locus, and the vertical width, that is, the address. The difference between the Y value at the start point (P2) and the Y value when the center of gravity is biased to the front during the downswing, the center of gravity at impact, the load,
It was found that the characteristics of the swing can be well represented by using indexes such as the load change during the swing.

For example, when the center of gravity moves close to the outside of the right foot (RF) and the backswing's center of gravity travels too long, a sway is occurring, and the center of gravity locus is not fully spread to the left and right in the middle of both feet. When the lateral length of the center-of-gravity locus is small, it indicates that the player enters the downswing before the weight is sufficiently shifted to the right in the backswing, and the weight remains on the right foot after the impact.

In addition, the part 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, and as the top plate (11) is tilted, the load cell (12), (13), (14), (15)
If the posture of the load is changed in conjunction with it and the pressure receiving direction is maintained vertically, the load measuring table can be appropriately tilted, and the swing on the slope can be simulated. Useful for practicing troubleshooting problems.

In the above description, the device and the orientation of the body are limited to the left and right, but it goes without saying that the head detector can be used as it is for a left-handed subject if the head detector is arranged 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]

The drawings show an embodiment of a golf swing diagnostic apparatus according to the present invention, FIG. 1 is a plan view showing the positional relationship between a load measuring stand and a head detector in one embodiment of the present invention, and FIG. 2 is an elevation view. , FIG. 3 and FIG. 4 are an example in which a plane projection view of the locus of the center of gravity of the subject and changes over time are recorded, FIG. 5 is a drawing for explaining the equipment configuration in the embodiment of the present invention, and FIG. 6 is its block. It is a diagram. (1) …… Load measurement stand, (2) …… Head detector,
(3) …… Computing device, (4) …… Display device, (12) to
(15) …… Load cell, (21), (22) …… Head detection light receiver, (41) …… Display, (42) …… Plotter.

Front page continuation (72) Inventor Takashi Kimura 1-1-1, Hama, Amagasaki City, Hyogo Prefecture Kubota Iron Works Co., Ltd. Technology Development Laboratory (56) Reference JP-A-60-24864 (JP, A) JP-A-50 -26571 (JP, A) JP-A-48-50745 (JP, A)

Claims (4)

[Claims] 1. A load measuring table comprising a top plate (11) on which a subject is placed, and three or more load cells (12), (13), (14), (15) supporting the top plate below the peripheral edge thereof. 1) A golf swing diagnostic machine provided with a detector (21) for detecting club head passage at a position where a golf ball is set and an address position of the club head,
A head detector (2) provided with (22) and load cells (12), (13), (14), (15) of the load measuring table (1).
An arithmetic unit (3) for calculating the position of the center of gravity of the load on the top plate (11) during the swing from the load measurement output of the above and the detection outputs of the detectors (21) and (22), and Trail 2
A golf swing diagnosis machine provided with a display device (4) for displaying as a three-dimensional projection view and displaying the center of gravity position at the backswing start time and impact time in the drawing. 2. A display device (4), comprising: storage devices (33), (35) for storing measurement results of a test subject's trial.
When the new measurement result is displayed, the storage device (33),
The golf swing diagnostic machine according to claim 1, wherein the stored information of (35) is displayed so as to be superimposed on the measurement result. 3. The load cell (1) of the load measuring table (1)
Claims 2), (13), (14) and (15) are provided with a computing device (3) for computing the characteristic value of the subject's center of gravity trajectory from the load measurement outputs and a display device (4) for displaying the result. 1. The golf swing diagnosis machine according to 1. 4. The characteristic value of the center-of-gravity locus that is calculated and displayed is the lateral distance and time of the center-of-gravity movement during the backswing, the lateral distance and time of the center-of-gravity movement during the downswing, and the vertical movement width, during the follow-swing. Vertical distance of movement of the center of gravity of
4. The golf swing diagnosis machine according to claim 3, wherein the golf swing diagnosis machine includes one of a gravity center position and a load at the time of impact.