JP2786579B2 - Hitting motion practice 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 swing table on which a subject who hits a ball while holding a hitting tool is placed, load measuring means for measuring the load centers of the right and left feet of the subject, and measurement of the load measuring means. The present invention relates to a hitting motion training machine provided with control means for outputting a two-dimensional trajectory of the center of load of the entire body of the subject or each of the right and left feet to a display means during a hitting action based on a result.

[0002]

2. Description of the Related Art Such a ball hitting training machine is used for practicing a ball hitting operation such as golfing and batting. It is known that in the practice of the hitting ball operation, whether or not the center of gravity is correctly moved with the hitting ball operation is an important index for forming a correct hitting ball form. Therefore, in such a golf practice machine, the footprint of the subject and the two-dimensional trajectory of the load center of the subject's entire body or each of the right and left feet during the hitting operation are displayed in a state in which the two-dimensional trajectory is associated with the positional relationship on the swing table. Conventionally, when an attempt is made to display the information on the means, the footprint of the subject and the position of the footprint on the swing table are detected before the start of the hitting operation. That is, for example, the subject's body is swung in the front-rear direction, and the movement trajectory of the load center corresponding to each of the left and right feet at that time is measured. Based on the movement trajectory, the subject's footprint and the swing of the footprint are measured. The position on the table is detected in advance (see Japanese Patent Application No. 4-71798 already proposed by the present applicant).

[0003]

In general, when displaying a measurement result (two-dimensional trajectory of the center of the load of the right and left feet) of the subject during the ball-hitting operation of the subject, the measurement result and the positional relationship of the foot are displayed. To clarify, it is possible to more accurately analyze the movement of the center of gravity due to the hitting operation. Conventionally, for this reason, as described above, the footprint of the subject and the position of the footprint on the swing table are measured in advance, and then the ball is hit. Therefore, each time the foot position changes, the foot position is changed. Measurement had to be performed to perform the hitting operation. By the way, in the practice of hitting the ball, it is very difficult in practice to continuously hit the ball without changing the position of the foot, and the position of the foot changes slightly each time the ball is hit. Is common. The present invention has been made in view of the above-described circumstances, and its purpose is to easily and easily change the position and stance of a subject to stand and perform a ball-hitting operation, and easily and easily position the foot in the ball-hitting operation. It is an object of the present invention to provide a convenient hitting ball training machine that can accurately detect a ball.

[0004]

A hitting ball training apparatus according to the present invention comprises a swing table on which a subject who hits a ball while holding a hitting tool is placed, and load measuring means for measuring the center of load of each of the right and left feet of the subject. Control means for outputting to the display means a two-dimensional trajectory of the load center of the entire body or each of the right and left feet of the subject during the hitting operation based on the measurement result of the load measuring means, A first characteristic configuration is that the control means detects a subject's footprint and a position of the footprint on the swing table based on a measurement result of the load measurement means during a hit ball operation, and detects the footprint and the load center. And the two-dimensional trajectory is displayed on the display means in a state where the two-dimensional trajectory is associated with the positional relationship on the swing table. A second characteristic configuration is that the control means extracts, as a reference position, a position on the swing table of a load center located on the toe side among load centers of the right and left feet of the subject during the hitting operation. The present invention is characterized in that the footprint and the position of the footprint on the swing table are detected based on the position.

[0005]

According to the first characteristic configuration of the present invention, when a subject performs a hitting operation on a swing table, a two-dimensional trajectory of a load center and a footprint during the hitting operation are related to a positional relationship on the swing table. Is displayed on the display means in a state in which it is associated with. Therefore, the footprint and the position of the footprint on the swing table can be detected without performing a special measurement such as measuring the position of the foot by swinging the subject's body back and forth. . According to the second feature configuration, the position on the swing table of the load center located on the toe side among the load centers of the left and right feet of the subject during the hitting operation is extracted as a reference position, and based on the reference position. ,
The footprint and the position of the footprint on the swing table can be detected. That is, in the case of a golf swing, generally,
Near the top position, the load center of the left foot moves to the base of the left toe, which is the toe side of the left foot, and near the finish point, the load center of the right foot moves to the base of the right toe, which is the toe side of the right foot Therefore, by detecting the position on the swing table of the load center located on the toe side among the load centers of each of the left and right feet of the subject during the ball hitting operation, it is possible to accurately detect the vicinity of the base of the left and right toes Can be done.

[0006]

According to the first characteristic configuration, the footprint and the position of the footprint on the swing table can be detected without performing any special measurement. Therefore, the hitting motion training machine is more convenient. I can reach it. According to the second characteristic configuration, a hitting ball training machine capable of accurately detecting the vicinity of the bases of the toes of the left and right toes, and thus accurately detecting the footprint and the position of the footprint on the swing table. That can be provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a golf practice machine will be described below with reference to the drawings. 1 to 3,
1 is a swing table, 2 is a ball mounting table, 3 is a processing device, 4 is a display device as a display means. The golf practice machine of the present embodiment processes the detection data of the load detection sensor D provided on the swing table 1 by the processing device 3 during the swing, displays the center of the load on the display device in real time, and displays the load or This is temporarily stored as time-series data of the load center, and is displayed after the end of the swing. Hereinafter, each device will be described.

The swing table 1 includes two load detection tables 10 and 11 corresponding to the left and right legs, respectively.
Are four load cells 12, 1 as load detection sensors D
Four corners are supported by 3, 14, and 15, and the load detection base 11 is supported at four corners by four load cells 16, 17, 18, and 19 as load detection sensors D. On the swing table 1, the subject holding the club C swings. At this time, the loads applied to the swing table 1 are eight load cells 12, 13, 14, 15, 16, 17, 18, and 1 supporting the two load detection tables 10 and 11.
9, the load and the load center of the subject, and further, the load centers corresponding to the left and right feet of the subject are obtained from these outputs as described later.

A support 25 on which a ball 24 is placed when practicing swinging with a wood club or the like is mounted on the ball mounting table 2. On the swing table 1 side of the support 25, an iron club or the like is mounted. A marker 70 indicating a position at which a ball is directly mounted on the ball mounting table 2 during swing practice is drawn. A ball detection sensor 21 is provided on both sides of the support member 25 and the marker 70 across the club head passage, as a ball presence / absence detection means for detecting the presence / absence of the ball 24. The sphere detection sensor 21 functions as a reset switch when starting a new swing when the sphere 24 is placed on the support 25 or the marker 70, and the sphere detection sensor 21 is provided on the support 25 or the marker 7.
The point at which the ball 24 on 0 is hit by the club C and no longer on the support 25 is detected as an impact point, which is one of the characteristic points in the golf swing. On both sides of the support 25 and the marker 70 across the club head passage on the back swing side, a club detection sensor 22 for detecting the movement of the club C to the back swing side is provided.

The ball detecting sensor 21 and the club detecting sensor 2
Each of the reference numerals 2 includes a transmission type optical sensor. The arrangement of these sensors is such that the light emitting portion 21a of the ball detecting sensor 21 and the light emitting portion 22a of the club detecting sensor 22 are installed on the opposite side of the swing head 1 in the club head passage, and the club head of the light emitting portions 21a, 22a is provided. On the opposite side of the passage, a light receiving portion 21b of the ball detection sensor 21 and a light receiving portion 22b of the club detection sensor 22 are installed so as to face the respective light emitting portions 21a, 22a. The detection light emitted from the light emitting portion 21a of the ball detection sensor 21 is received by the light
b, the detection light is made to pass through the area where the sphere 24 above the support 25 and the marker 70 should exist, and when the sphere 24 is placed on the support 25,
When a ball is placed on the marker 70, the presence or absence of the ball 24 can be similarly detected. The projection path of the detection light of the club detection sensor 22 is set so as to be substantially parallel to the projection path of the detection light of the sphere detection sensor 21. Even when the sphere 24 is placed on the support 25, the marker 70 When putting a ball on top,
It is possible to reliably detect the passage of the club.
Drive circuits for the ball detection sensor 21 and the club detection sensor 22 are built in the control box 26.

The processing unit 3 includes an arithmetic unit 31 for performing arithmetic processing for obtaining a load and a center of load, a sequence control of the apparatus, an I / O interface 32 for transferring various data, and measuring information of the load and the center of the load. It comprises a storage device 33 for storing, an operation console 34 for selecting an operation mode of the device and inputting various comments, and an external storage device 35 for storing measurement information and the like. The display device 4 includes a graphic display device 4a and a plotter 4b. The graphic display device 4a has a two-dimensional trajectory of the load center of the whole body, the right and left feet, and a two-dimensional trajectory of the load ratio of the whole body (time change). However, a two-dimensional locus (time change) of the load ratio of the entire body is displayed on the plotter 4b.

Next, a process in which the arithmetic unit 31 calculates the load and the center of the load will be described. The subject holding the club C takes a stance by standing at the approximate center of the swing table 1 with the left and right feet resting on the two load detection tables 10 and 11, respectively. Taking the load detection table 10 on which the subject puts the left foot as an example, the outputs of the load cells 12, 13, 14, and 15 at the four corners of the load detection table 10 are previously adjusted by zero adjustment in the load converter 100, respectively. Since the loads have been offset, the total WL of the outputs W1, W2, W3, and W4 is the load on the left foot of the subject on the load detection table 10. That is, WL = W1 + W2 + W3 + W4 Further, at this time, depending on the relationship between the position where the load is applied and the installation positions of the four load cells 12 to 15, the load output of each load cell is different. You can find the center.

That is, the left-right component X and the front-rear component Y of the load center expressed by the load cell 12 in FIG. 1 as the origin are represented by four load cells 12 to 15 having a width a in the X direction and a width Y in the Y direction. In the case of being disposed at the four corners of the rectangular load detection table 10 of b, it can be obtained from X = (W2 + W3) × a / WL Y = (W3 + W4) × b / WL. Note that the load cells 12, 13,
Even when the arrangement of 14 and 15 is not at the four corners of the rectangle, the center of load can be obtained by performing a correction unique to the geometric arrangement of the load cells. If three or more load cells are provided, the center of load applied to the swing table 1 can be obtained. The load detection table 11 on which the subject places the right foot is also configured in the same manner as the load measuring device 10, and the load center of the load applied to the load detection table 11 can be obtained in the same manner as described above. That is, the center of load corresponding to each of the right and left feet of the subject can be obtained.

For the load on both feet of the subject, that is, the entire body and the load center, the load applied to the load detecting
Let R be the load cell 16 as in the case of the left foot.
From the outputs W5 to W8 of １９19, WR = W5 + W6 + W7 + W8 The load WT of the whole body is obtained by WT = WL + WR, and the load center is the distance between the load center corresponding to the subject's left foot and the load center corresponding to the right foot. Assuming that L is on a line segment connecting the left and right load centers, it is located at a position WR × L / WT away from the load center corresponding to the left foot, and this may be calculated.

As shown in FIG. 3, eight load cells 12 to
Outputs W1 to W4 and W5 to W8 of 15 and 16 to 19
Is a load converter 100 having a measurement bridge circuit and an A / D converter. After compensating for the weight of the swing table 1 as described above, the load converter 100 is sampled at regular intervals to obtain a digital value. Then, the data is sequentially taken into the processing device 3 via the I / O interface 32. The load WT, the load center, and the load center corresponding to each of the left and right feet of the subject are obtained by the arithmetic unit 31 in the processing device 3 according to the above-described formula. Then, the arithmetic unit 31 displays the obtained load centers corresponding to the whole body of the subject and the respective right and left feet on the graphic display device 4a of the display device 4 in real time, as well as the time-series data of the load and the subject. The time series data of the load center corresponding to each of the left and right feet and the load center corresponding to the whole body of the subject is stored in the storage device 33. Further, the arithmetic unit 31 obtains a load ratio by dividing the obtained load corresponding to the whole body of the subject and each of the right and left feet by the weight value of the subject, and stores time-series data of those load ratios in the storage device. 33
To memorize. The weight value of the subject is obtained by averaging the weight values of the entire body of the subject before the start of the swing.

Accordingly, the arithmetic unit 31 functions as a load measuring unit M for measuring the center of the load on each of the right and left feet of the subject, and also functions as a control unit for controlling the display of the display device 4.

The time-series data is stored by the ball detection sensor 21 when the ball detection sensor 21 detects that the ball 24 is placed on the support 25 or the marker 70 and resets the apparatus. The data up to the impact point for detecting that the ball 24 on the tool 25 or the marker 70 has been hit and lost is sequentially updated with the oldest data in the storage area of the storage device 33 having an appropriate storage capacity. And the data after the impact point is stored in another storage area having a storage capacity corresponding to a predetermined time width.

Along with these time series data, the load center of each of the right and left feet of the subject at the time of address, the load center of the whole body of the subject, the load ratio of the left foot at the time of address,
The load center corresponding to the whole body of the subject, the load center corresponding to each of the left and right feet and the load ratio of the whole body of the subject at the swing start point, the load center and the load ratio of the whole body at the start point of the body turn, the load center of the whole body at the top position, Load ratio, right foot load ratio, overall body load center and load ratio at swing-down point, overall body load center at impact point, load ratio, left foot load ratio, overall body load center and load at finish point The ratio is also stored in the storage device 33. Each load center at the time of addressing is obtained by averaging the positions of each load center before the swing start point detected as described later.

Next, a process in which the club detection sensor 22 and the arithmetic unit 31 detect a swing starting point which is one of the characteristic points in the golf swing will be described. In the storage device 33, together with the data of the load and the load center,
Information as to whether or not the club detection sensor 22 has detected passage of the club head is also stored in chronological order. Based on the stored information, the arithmetic unit 31 sets the time when the first club detection sensor 22 detects the passage of the club head retroactively from the impact point, except for the time of about 100 ms immediately before the impact point, as the swing start point. To detect.

Next, a process in which the arithmetic unit 31 detects a body turn start point which is one of the characteristic points in the golf swing will be described. Of the load and load center data obtained by the arithmetic unit 31 and stored in the storage device 33 as described above, the time change of the load on the lower leg of the subject in the backswing direction shown in FIG. FIG. 4 illustrates a device configuration for a right-handed subject, so that a search is started from the data corresponding to the swing start point indicated by point A in FIG. The position on the time axis of B is detected as the body turn start point.

Next, a process in which the arithmetic unit 31 detects a top position which is one of the characteristic points in the golf swing will be described. The arithmetic unit 31 time-differentiates the component in the left-right direction, that is, the X direction, of the time-series data of the load center corresponding to the entire body of the subject stored in the storage device 33 obtained as described above, and calculates the X of the load center. The time change of the moving speed in the direction is obtained. In the time change of the moving speed in the X direction illustrated in FIG. 5, a point F, which is a predetermined time earlier than the data of the impact point detected by the ball detection sensor 21 indicated by a point E in FIG. Point F indicating the reference time
The data is searched for in the direction going back in time from, and the sign of the moving speed in the X direction first reverses from negative to positive, that is, the point G where the directionality of the moving speed in the X direction first reverses is set as the top position. To detect. Note that the time interval from the point E indicating the impact point to the point F which is the reference time is erroneously determined as the top position because the direction of the moving speed may be in the backswing direction immediately before the impact point. This time interval is appropriately about 200 mS in order to prevent detection.

Next, a process in which the arithmetic unit 31 detects a swing-down point which is one of the characteristic points in the golf swing will be described. Among the data obtained by the arithmetic unit 31 and stored in the storage unit 33 as described above, the time change 90 of the right foot load and the time change 91 of the left foot load shown in FIG. From H
Up to the point I indicating the impact point detected by the ball detection sensor 21 corresponds to a downswing. During this downswing, from the point J indicating the point at which the load on the left and right feet of the subject becomes equal, the foot on the upper hand side in the downswing direction within the time t on the side where time passes and the time t 'on the side going back in time. Is obtained, that is, the rate of change of the load on the right foot, that is, the time differential value. It is appropriate that the time widths t and t 'are both about 50 mS. The point K indicating the time when the absolute value of the rate of change of the time change 90 of the right foot load becomes the minimum value is detected as a swing-down point.

It should be noted that 0.2 seconds after the impact point detected by the ball detection sensor 21 is detected as a finish point which is one of the characteristic points in the golf swing.

Further, the arithmetic unit 31 is used during the hitting operation.
Measurement results of the load measuring means M (that is,
Based on the load center), the subject's footprint and the footprint
The position on the wing table 1 is detected, and the footprint and the center of the load are detected.
Associating a two-dimensional trajectory with the positional relationship on the swing table 1
In such a case, it is displayed on the graphic display device 4a
Is configured. That is, the arithmetic unit 31 performs the hitting operation
Of the load centers of the left and right feet of the subject
The position of the load center on the toe side on the swing table 1
Reference position P ₀And its reference position P₀Based on
Are configured to create left and right footprints f as follows:
Have been.

Hereinafter, the reference position P₀Create a footprint f based on
A method of creating a footprint to be formed will be described using the left foot as an example. leg
The vertical width AL is initially set regardless of the size of the subject's foot.
And the footprint f is an ellipse f₁(Big
The larger ellipse) and f_Two(Smaller ellipse) and more formed
Have been. Note that the ellipse f in this embodiment is₁The major axis is (A
L × 4/5) and the minor axis is set to (AL × 2/5)
And the ellipse f_TwoThe major axis is (AL x 3/5) and the minor axis is
(AL × 3/10). And the reference position
Place P₀The ellipse f at (AL × 3/10)₁in
Center point P ₁And set the center point P₁More (AL × 3/1
Ellipse f at 0)_TwoCenter point P of_TwoSet. However
In this embodiment, the center point P_TwoTo the center point P₁For d
x (about 10mm)
Is to bring the footprint f closer to the actual footprint.
You do not have to shift it. The footprint f is in front of the center of load.
It is set to be parallel to the backward component Y.

Next, the operation of the apparatus in use will be described with reference to the flowchart of FIG. 8 and the display examples of FIGS. 9 to 11. In the flowchart of FIG. 8, after the power switch (not shown) is turned on to start the apparatus, the operator sets the operation mode of the apparatus from the console 34 (step # 1). There are two operation modes, a reference trajectory display mode and a reference trajectory non-display mode. In the reference trajectory display mode, the time series data of the load center (for an ideal swing) and the load ratio, which are stored in the external storage device 35 in advance, are used as reference trajectory data, and the two-dimensional load center of the reference trajectory is used. Locus (moving locus)
Is displayed on the graphic display device 4a together with the display data of the load center related to the new swing, and the two-dimensional trajectory (time change) of the load ratio of the reference trajectory is displayed together with the two-dimensional trajectory (time change) of the load ratio related to the new swing. It is displayed on the plotter 4b. In the reference trajectory non-display mode, the data of the reference trajectory is not displayed, and only the display data related to the new swing is displayed.

When one of these two modes is selected and the setting of the operation mode is completed, it is determined in step # 2 whether or not the operation mode is set to the reference trajectory display mode. If the operation mode is set to the reference trajectory non-display mode, the process proceeds to step # 5 without doing anything. If the operation mode is set to the reference trajectory display mode, the reference trajectory 40 is displayed on the reference trajectory 40 together with the reference trajectory 40. Are displayed on the graphic display device 4a (step # 4), indicating the respective characteristic points (address, swing start, body turn start, top, swing down, impact, and finish points). Go to 5.

In step # 5, the ball detection sensor 21
It is determined whether or not the ball 24 is placed on the support 25 or the marker 70 based on the detection information. If the ball 24 is not on the support 25 or the marker 70, the load corresponding to the entire body is determined. The center of the load and the center of the load corresponding to each of the right and left feet are displayed in real time, and the process returns to step # 5.
That is, the detection data of the load detection sensor D is fetched (Step # 14), and as shown in the display example of FIG. 9, the arithmetic processing is performed, and the load centers corresponding to the whole body and the load centers corresponding to the right and left feet, respectively. (Step # 15), and displayed on the graphic display device 4a as the load center point 50 of the left and right feet and the load center point 51 of the whole body, respectively, and further, the ratio of the load of each of the left and right feet to the total load (that is, ,
WL / WT and WR / WT) are obtained, and displayed as ratio display points 53 in the display columns 52 provided at the left and right ends of the display screen of the graphic display device 4a so that the larger the ratio value is, the higher the ratio value is. ). Note that the display example of FIG. 9 illustrates a case where the reference trajectory display mode is selected in step # 1. After performing this screen control, the console 34
It is determined whether or not the mode change switch is pressed (step # 17). If the switch is pressed, the process returns to step # 1 so that the operation mode can be set. If not, the process proceeds to step # 5. Return.

In step # 5, the ball 24 is
5 or on the marker 70, the device is in a reset state, the load data of a new swing is collected, the data is calculated, the load center corresponding to the whole body, and the right and left feet The collected data is stored in the storage device 3 while displaying the corresponding load centers and the like in real time.
Go to 3 That is, the stored data such as the reference trajectory and the display on the graphic display device 4a are left as they are, and the stored data corresponding to the previous swing and the display on the graphic display device 4a are cleared (step # 6). Then, the detection data of the load detection sensor D is taken in (Step # 7), and the load and the load center of the whole body, the load center corresponding to each of the left and right feet, and the ratio of the load of each of the left and right feet to the total load. Is calculated in the storage device 33 and stored in the storage device 33, and the calculation result is displayed on the graphic display device 4a as the load center point 50 of the left and right feet, the load center point 51 of the whole body, and the ratio display point 53 (step #). 8 and # 9).

After this screen control, it is determined whether or not the swing has already been completed based on whether or not a predetermined time has elapsed from the impact point (step # 10). Return to position 7. When it is determined that the swing has already ended after a predetermined time has elapsed from the impact point, as shown in FIG. 10, the movement locus 55 of the load center of the entire body and the left and right feet Movement locus 5 of the corresponding load center
6, 57, the load ratio locus 71 of the whole body, and the footprint f are displayed (step # 11). In addition, on the movement locus 55 of the load center of the entire body, marks 59 to 59 indicating respective characteristic points (each point of address, swing start, body turn start, top, swing down, impact, and finish) are shown.
65 is displayed, and marks 58 indicating the load centers corresponding to the left and right feet of the subject at the time of address are displayed on the movement trajectories 56 and 57 of the load centers corresponding to the left and right feet, respectively.

Further, at the upper end of the display screen of the graphic display device 4a, an address left foot load ratio 66 indicating the ratio of the left foot load to the subject's weight at the address, and the ratio of the right foot load to the subject's weight at the top position are shown. , And an impact left foot load ratio 68 indicating the ratio of the left foot load to the subject's weight at the impact point are displayed (step # 11). Note that FIG. 10 also shows a display example when the reference trajectory display mode is selected, as in FIG. 9, and the display of the ratio display point 53 in the display column 52 indicates the state of the impact point. It is.

Further, as shown in FIG. 11, when the reference trajectory display mode is selected, data 71 on the time change of the load ratio of the whole body and data 72 on the time change of the load ratio of the reference trajectory data. Are displayed on the plotter 4b so that the impact times coincide (step # 11). Then, on the display of the data 71 of the time change of the load ratio of the whole body, marks 60 to 60 indicating the respective characteristic points (each point of swing start, body turn start, top, swing down, impact, and finish) are displayed. 65 is displayed, and each characteristic point (each point of a swing start, a body turn start, a top, a swing down, an impact, and a finish) is shown on the display of the time change data 72 of the load ratio of the reference trajectory data. The marks 43 to 48 are displayed. When the reference trajectory non-display mode is selected, only the data 71 of the time change of the load ratio of the whole body is displayed on the plotter 4b. The display of the load center on the graphic display device 4a is based on the data from the swing start point to the finish point, and the time change data 71 of the load ratio of the graphic display device 4a and the time change of the load ratio on the plotter 4b. The data 71 and 72 are configured to display data for a predetermined time before and after the impact point, respectively.

Thereafter, when the measured load and the data of the load center are not stored, the position returns to the position where the presence or absence of the ball 24 is detected. When the data is stored, the measured data is transferred to the data storage area of the storage device 33 ( Steps # 12 and # 1
3) Return to the position of step # 5.

[Other Embodiments] Other embodiments of the present invention will be listed below. In the above embodiment, the vertical width and the horizontal width of the foot are set in advance irrespective of the size of the subject's foot, and the load located on the toe side among the load centers of the left and right feet of the subject during the ball-hitting operation. the position of the swing table 1 of the center are extracted as the reference position P _0, on the basis of the reference position P _0, but so as to create a lateral footprint f, to create a forming method and footprint footprint f Of each part (vertical width A of the foot
L, the width of the foot) can be variously changed. For example,
Each time the subject changes the vertical width and the horizontal width of the foot, the console 3
4 and may be changed. In the case of a golf swing, the center of load moves near the base of the left toe due to the weight shift of the right foot and the rotation of the body near the top position, and the weight shift to the left and the rotation of the body at the finish point. As a result, the load center moves near the base of the right toe, so that the load center at the top position of the right foot is the reference position P _{0 of the} right foot, and the load center at the finish point of the left foot is the reference position P _{0 of the} left foot. Thus, the footprint f may be created. Further, an address point 58 the width AL of the vertical legs may be determined by the reference position P ₀ of the foregoing. Thus, for example, may be set the width AL of the vertical legs 2 times the width of the address point 58 and the reference position P _0. At this time, by any one of the address point 58 and the reference position P ₀ of the foot, both feet vertical width AL
May be determined, or the vertical widths of both feet are determined by averaging the vertical widths of the right and left feet obtained from the address points 58 of the left and right feet and the reference position P _0. You may do it. Further, the width AL of the vertical legs determines the address point 58 by the reference position P ₀ of the foregoing, the address point 58 is a predetermined position of the footprint (e.g., arch position) to create a footprint f as come You may do it. Further, footprint f is to pass through the reference position P ₀ of the foregoing, it may be created footprint f. In other words, it may be to create a footprint f the reference position P ₀ as the feet. Further, the lateral width of the foot may be determined from the lateral width of the moving trajectories 56 and 57 of the load center corresponding to the left and right feet, respectively. For example, the lateral width of the movement trajectories 56 and 57 or a width obtained by multiplying the lateral width by a predetermined value may be used as the lateral width of the foot. In the above embodiment,
The foot shape f is set so as to be parallel to the longitudinal component Y of the load center, but the direction (direction) of the foot is set to the direction of a straight line connecting the address point 58 and the reference position P _0. May be. In the above embodiment, the graphic display device 4a displays the two-dimensional trajectory (moving trajectory) of the load center of each of the entire body, the left and right feet, and the time change of the load ratio of the entire body on the plotter 4b.
Although the time change of the load ratio of the whole body is displayed in FIG. 5, the display of both may be exchanged and displayed. The load ratio of each of the left and right feet may be displayed together with the time change, and the load ratio of each of the right and left feet may be compared and evaluated. In the above embodiment, the mark 58 indicating the load center corresponding to each of the right and left feet of the subject at the time of address is displayed on the movement trajectories 56 and 57 of the load centers corresponding to the left and right feet, respectively. A mark indicating the load center corresponding to the feature point may be displayed.

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

[Brief description of the drawings]

FIG. 1 is a plan view of a golf practice machine to which the present invention is applied.

FIG. 2 is a side view of a golf practice machine to which the present invention is applied.

FIG. 3 is a block diagram of a golf practice machine to which the present invention is applied.

FIG. 4 is a diagram showing detection of a body turn start point.

FIG. 5 is a diagram showing detection of a top position.

FIG. 6 is a diagram showing detection of a swing-down point;

FIG. 7 is an explanatory diagram of footprint creation.

FIG. 8 is a flowchart according to an embodiment to which the present invention is applied.

FIG. 9 is a display example of a load center and the like according to the embodiment to which the present invention is applied.

FIG. 10 is a display example of a footprint and the like according to the embodiment to which the present invention is applied.

FIG. 11 is a display example of a time change of a load ratio according to the embodiment to which the present invention is applied.

[Explanation of symbols]

 Reference Signs List 1 swing table 4 display means 31 control means C hitting tool M load measuring means

Claims (2)

(57) [Claims] 1. A swing table (1) on which a subject performing a ball-hitting operation while holding a hitting tool (C) is mounted, load measuring means (M) for measuring the load centers of the right and left feet of the subject, and the load measurement A hitting ball provided with a control means (31) for outputting a two-dimensional trajectory of the load center of the whole body of the subject or each of the right and left feet to the display means (4) during the hitting operation based on the measurement result of the means (M) A motion training machine, wherein the control means (31) is based on a measurement result of the load measuring means (M) during a hitting ball motion and a position of the subject's footprint and the footprint on the swing table (1). Is detected, and the footprint and the two-dimensional trajectory of the load center are displayed on the display means (4) in a state of being associated with the positional relationship on the swing table (1). Hitting motion practice machine. 2. The control means (31) sets a position on the swing table (1) of a load center located on the toe side among load centers of right and left feet of a subject during a hitting operation as a reference position. 2. The hit ball training apparatus according to claim 1, wherein the apparatus is configured to extract and detect the footprint and the position of the footprint on the swing table based on the reference position. 3.