JPH0724097A - Instrument for practice of hitting motion of ball - Google Patents

Abstract

PURPOSE:To enable to see instantly state of movement of centers of load of both left and right feet at each characteristic point by displaying on a displaying means characteristics of the movement at more than three points which are divided by a control means into plural pairs at which elapsed times are adjacent and directed by it to a displaying means to display in such a manner as avoiding overlapping of the pairs. CONSTITUTION:An instrument for practice of hitting motion of ball is equipped with a platform for swing 1 which bears a subject, a measuring means of load M which measures a load center of each left and right foot of the subject, a detecting means of characteristics S which detects characteristics of the movement at more than three points, and a control means R which directs the display means to display a load center of each left and right foot detected by the detecting means of characteristics S in such manner as corresponding to the position taken on the platform for swing 1. This control means R divides characteristics detected at more than three points into plural pairs of characteristics at which elapsed times are adjacent and directs the display means to display the pairs thus derived in such a manner as avoiding overlapping of the pairs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing base on which a subject who swings while holding a club is placed, a load measuring means for measuring the load centers of the left and right feet of the subject, and three or more features in hitting motion. The characteristic point detecting means for detecting a point and the load centers of the left and right feet of the characteristic points detected by the characteristic point detecting means are displayed on the display means in a state of being associated with the positional relationship on the swing table. The present invention relates to a ball hitting training machine provided with a control means.

[0002]

2. Description of the Related Art Such a ball hitting practice machine is used for practicing ball hitting motions such as golf and batting. And when practicing these ball hitting movements,
It is known that whether or not the center of gravity moves correctly with a ball hitting motion is an important index for forming a correct ball hitting form. Therefore, in such a ball striking action training machine, the load centers of the left and right feet of the subject in the ball striking motion are measured, three or more characteristic points in the ball striking motion are detected, and the left and right feet of each of the detected characteristic points are detected. In displaying the respective load centers on the display means, conventionally, the load centers of the left and right feet at each of the three or more characteristic points are overlapped and displayed in correspondence with the positional relationship on the swing table.

[0003]

Therefore, in the conventional ball hitting practice machine, since the load centers of the left and right feet of each of the three or more characteristic points are displayed in an overlapping manner as described above, the display is complicated. The display state was inconvenient to immediately grasp the movement state of the load center of each of the left and right feet between each characteristic point. The present invention has been made in view of the above circumstances, and an object thereof is to immediately grasp the moving state of the load center of each of the left and right feet between each characteristic point on the display of the hitting motion training machine. It is to provide a display that can.

[0004]

A ball hitting practice machine of the present invention comprises a swing table on which a subject who grips a club and swings is placed, load measuring means for measuring the load centers of the left and right feet of the subject, and a ball hitting ball. A state in which the characteristic point detecting means for detecting three or more characteristic points in the operation and the load centers of the left and right feet of the characteristic points detected by the characteristic point detecting means are associated with the positional relationship on the swing table. In the first characteristic configuration, the control means has two or more of the three or more characteristic points whose elapsed times are adjacent to each other. Is divided into a plurality of groups, and the plurality of groups are arranged so as not to overlap each other, and are displayed on the display means. A second characteristic configuration is that the control means is configured to display a straight line connecting the load centers of the left and right feet at each characteristic point.

[0005]

According to the first characteristic configuration of the present invention, the load centers of the left and right feet at each of the three or more characteristic points in the ball striking motion are associated with the positional relationship on the swing base, and A plurality of sets each including two feature points adjacent to each other in time are arranged for each set (so that the sets do not overlap each other) and are displayed on the display means. According to the second characteristic configuration, in the display of the first characteristic configuration, a straight line connecting the load centers of the left and right feet is displayed.

[0006]

According to the first characteristic configuration of the present invention, the load centers of the left and right feet at each of the three or more characteristic points in the ball striking motion are each a plurality of groups each including two adjacent characteristic points. Since the groups are displayed in a state in which they are arranged side by side (so that the groups do not overlap), the moving state of the load center of each of the left and right feet between two adjacent feature points is displayed in an easily visible state. Therefore, in the display of such a ball hitting exercise training machine, it is possible to provide a display capable of immediately grasping the moving state of the load center of each of the left and right feet between each characteristic point. According to the second characteristic configuration, since a straight line connecting the load centers of the left and right feet is displayed, the positional relationship between the left and right feet at each feature point can be immediately determined by the straight line, which is more convenient. Has come to provide a good display.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 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, and 4 is a display device as a display means. During the swing, the golf training machine of the present embodiment processes the detection data of the load detection sensor D provided on the swing base 1 by the processing device 3 to display the load center on the display device in real time, and The time-series data centered on the load is temporarily stored and displayed after the swing is completed. Hereinafter, each device will be described.

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

A support tool 25 for mounting the ball 24 when performing a swing practice with a wood club or the like is mounted on the ball mounting table 2, and the swing tool 1 side of the support tool 25 has an iron club or the like. A marker 70 indicating the position where the ball is directly placed on the ball placing table 2 when the swing is practiced is drawn. Then, a ball detection sensor 21 as a ball presence / absence detecting means for detecting the presence / absence of the ball 24 is provided on both sides of the support tool 25 and the marker 70 sandwiching the club head passage. The ball detection sensor 21 functions as a reset switch for starting a new swing when the ball 24 is placed on the support tool 25 or the marker 70, and also on the support tool 25 or the marker 7.
The time when the ball 24 on 0 is hit by the club C and disappears from the support 25 is detected as an impact point which is one of the characteristic points in the golf swing. A club detection sensor 22 for detecting the movement of the club C to the backswing side is provided on both sides of the support tool 25 and the marker 70 on both sides of the club head passage on the backswing side.

Sphere detection sensor 21 and club detection sensor 2
Each of 2 is composed of a transmissive optical sensor. As for the arrangement of these sensors, the light emitting portion 21a of the ball detection sensor 21 and the light emitting portion 22a of the club detection sensor 22 are installed on the side of the club head passage opposite to the swing base 1, and the club heads of these light emitting portions 21a, 22a are arranged. 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 opposite to each other across the passage, facing the respective light emitting portions 21a, 22a. The detection light emitted from the light emitting portion 21a of the sphere detection sensor 21 is located on the light receiving portion 21 diagonally below.
Although it is projected toward b, this detection light passes through the region where the sphere 24 above the support tool 25 and the marker 70 should exist, and when the sphere 24 is placed on the support tool 25,
Even when the sphere is placed on the marker 70, the presence or absence of the sphere 24 can be similarly detected. The projection path of the detection light of the club detection sensor 22 is set to be substantially parallel to the projection path of the detection light of the sphere detection sensor 21, and even when the sphere 24 is placed on the support tool 25, the marker 70 is used. If you put a ball on top,
The passage of the club can be detected without fail.
The drive circuit for the ball detection sensor 21 and the club detection sensor 22 is built in the control box 26.

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

Next, the process of calculating the load and the load center by the arithmetic unit 31 will be described. The test subject who holds the club C stands in a substantially center position on the swing table 1 while standing with the left and right feet on the two load detection tables 10 and 11, respectively. Taking the load detection table 10 on which the subject places his left foot as an example, the outputs of the load cells 12, 13, 14, 15 at the four corners of the load detection table 10 are adjusted in advance by zero adjustment in the load converter 100. Since the loads are canceled out, the total WL of the outputs W1, W2, W3, W4 becomes the load of the left foot of the subject on the load detection table 10. That is, WL = W1 + W2 + W3 + W4 Furthermore, at this time, since the shared output of each load cell differs depending on the relationship between the position where the load is applied and the installation position of the four load cells 12 to 15, the load applied to the load detection base 10 from these outputs. You can seek the center.

That is, regarding the left-right direction component X and the front-back direction component Y of the load center expressed with the load cell 12 in FIG. 1 as the origin, the four load cells 12 to 15 have the width a in the X direction and the width in the Y direction. In the case of being arranged at the four corners of the rectangular load detection base 10 of b, it can be obtained from X = (W2 + W3) × a / WL Y = (W3 + W4) × b / WL. In addition, the load cells 12, 13,
Even when the arrangements of 14 and 15 are not at the four corners of the rectangle, the load center can be obtained by performing the correction unique to the geometrical arrangement of the load cells. Further, if three or more load cells are provided, the center of load applied to the swing table 1 can be obtained. The load detection base 11 on which the subject places his right foot is also configured the same as the load measuring device 10, and the load center of the load applied to the load detection base 11 can be obtained in the same manner as above. That is, the load centers corresponding to the left and right feet of the subject can be obtained.

As for the load and center of load of both legs of the subject, that is, the whole body, the load applied to the load detection base 11 is W.
If it is R, as in the case of the left foot above, the load cell 16
From the outputs W5 to W8 of ~ 19, WR = W5 + W6 + W7 + W8 The overall load WT is obtained by WT = WL + WR, and the load center is the distance between the load center corresponding to the left foot and the load center corresponding to the right foot of the subject. If it is L, it is located at a position WR × L / WT away from the load center corresponding to the left foot on the line segment connecting the left and right load centers, and this can be calculated.

As shown in FIG. 3, eight load cells 12 ...
Outputs W1 to W4 and W5 to W8 of 15 and 16 to 19
Is a load converter 100 equipped with a measurement bridge circuit and an A / D converter, and after compensating for the weight of the swing table 1 as described above, it is sampled at regular intervals and becomes a digital quantity. Then, it is sequentially loaded into the processing device 3 via the I / O interface 32. The load WT of the subject, the load center, and the load centers corresponding to the left and right feet are calculated 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 entire body of the subject and each of the left and right feet on the graphic display device 4a of the display device 4 in real time, and 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 entire body of the subject are stored in the storage device 33. Further, the arithmetic unit 31 divides the obtained loads corresponding to the whole body of the subject and each of the left and right feet by the weight value of the subject to obtain the load ratio, and the time series data of these load ratios is stored in the storage device. 33
Remember. 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.

Therefore, the arithmetic unit 31 functions as a load measuring unit M for measuring the load centers of the left and right feet of the subject and also as a control unit R for controlling the display of the display unit 4.

The time-series data is stored by the sphere detection sensor 21 after the sphere detection sensor 21 detects that the sphere 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 to the oldest data in the storage area of the storage device 33 having an appropriate storage capacity. The data is stored endlessly so that the data after the impact point is stored in another storage area having a storage capacity corresponding to a predetermined time width.

With these time-series data, the load center of each of the left and right 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 whole body of the subject at the swing start point, the load center corresponding to each of the left and right feet and the load ratio of the whole body of the subject, the load center and the load ratio of the whole body at the body turn start point, the load center of the whole body at the top position, Load ratio, right foot load ratio, whole body load center and load ratio at the swing-down point, whole body load center at the impact point, load ratio, left foot load ratio, whole body load center and load at the finish point The ratio is also stored in the storage device 33. Each load center at the time of address is obtained by averaging the positions of the load centers 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 the swing start point which is one of the characteristic points in the golf swing will be described. In the storage device 33, together with the above-mentioned load and load center data,
Information on whether or not the club detection sensor 22 has detected the passage of the club head is also stored in time series. Based on this stored information, the arithmetic unit 31 excludes the time of about 100 mS immediately before the impact point and sets the time when the first club detection sensor 22 detects the passage of the club head as the swing start point by tracing back the time from the impact point. To detect.

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

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

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

Incidentally, 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.

Therefore, the ball detection sensor 21, the club detection sensor 22, and the arithmetic unit 31 function as a characteristic point detection means S for detecting three or more characteristic points in the golf swing (hit ball movement).

Further, the arithmetic unit 31 can be operated only during a ball hitting motion.
Measurement result of the load measuring means M (that is, for each of the left and right feet)
Based on the load center)
Detecting the position on the ing platform 1 and checking its foot shape and load center
Corresponds the two-dimensional trajectory to the positional relationship on the swing base 1.
Display on the graphic display device 4a in the digit state
Is configured. That is, the arithmetic unit 31 determines that the ball is hit.
Of the load centers of the left and right feet of the subject in
The position on the swing base 1 of the load center located on the toe side
Reference position P ₀As the reference position P₀Based on
Then, as shown below, it is configured to create the left and right foot shapes f.
Has been.

Hereinafter, the reference position P₀Create foot form f based on
The left foot is taken as an example to explain the method of creating a foot shape. leg
The vertical width AL of is set to the initial value regardless of the subject's foot size.
(About 300 mm), the foot shape f is an ellipse f₁(Big
Ellipse) and f₂More formed (smaller ellipse)
Has been. Note that the ellipse f in this embodiment is₁The major axis of (A
L × 4/5) and the minor axis is set to (AL × 2/5)
Cage, ellipse f₂The major axis of (AL x 3/5), the minor axis is
It is set to (AL x 3/10). And the reference position
Setting P₀Ellipse f at (AL × 3/10)₁in
Heart point P ₁And set the center point P₁More (AL × 3/1
Ellipse f at 0)₂Center point P of₂To set. However
However, in the present embodiment, the center point P₂Is the center point P₁Against d
It is provided by shifting it inside x (about 10 mm).
Is to bring the foot shape f closer to the actual foot shape.
It doesn't have to move. The foot shape f is in front of the center of the load.
It is set to be parallel to the backward component Y.

Further, the arithmetic unit 31 divides three or more feature points of the plurality of feature points into a plurality of sets with the two feature points adjacent to each other in elapsed time as a set, and divides the plurality of sets. The display means 4 is configured to display in a state where they are arranged so as not to overlap. That is, among the plurality of characteristic points, the three characteristic points of the swing start point, the top position and the impact point are divided into a set of the swing start point and the top position, and a set of the top position and the impact point, and each of the characteristic points is divided. As shown in FIG. 11, the load centers of the left and right feet of the set are displayed for each set in a state of being associated with the positional relationship on the swing table 1. The movement of the load center of the pair of the swing start point and the top position is displayed in the backswing column, and the movement of the load center of the pair of the top position and the impact point is displayed in the downswing column. However, in the address column, only the load centers of the left and right feet at the time of address are displayed. Further, in each of the characteristic points in the address column, the backswing column, and the downswing column, the straight line N connecting the load centers of the left and right feet and the foot shape f
Is configured to display. Furthermore, in the address column, the backswing column, and the downswing column, as shown in FIG. 11, the left and right load ratios at each characteristic point (at address, top position, impact point) are displayed. . However, also in the display of the load ratio, the ratio of each set is displayed for each set, similarly to the display of the load center.

Next, the operation of this device 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 activate the device, the operator sets the operation mode of the device 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 and the load ratio for comparison (ideal swing) stored in advance in the external storage device 35 is used as reference trajectory data, and the two-dimensional load center of the reference trajectory is used. Locus (movement locus)
Is displayed on the graphic display device 4a together with the display data of the load center relating to the new swing, and the two-dimensional trajectory (time change) of the load ratio of the reference trajectory is also displayed together with the two-dimensional trajectory of the load ratio relating to the new swing (time change). It is displayed on the plotter 4b. In the reference trajectory non-display mode, the data of the reference trajectory is not displayed, but only the display data regarding a new swing is displayed.

When either one of these two modes is selected to complete the setting of the operation mode, it is determined in step # 2 whether the operation mode is set to the reference locus display mode. If the operation mode is set to the reference locus non-display mode, the process proceeds to step # 5 without doing anything. If the reference locus display mode is set, the reference locus 40 and the reference locus 40 on the reference locus 40 are set. 42 to 48 indicating respective characteristic points (address, swing start, body turn start, top, swing down, impact, and finish points) on the graphic display device 4a (step # 4), and step # Go to 5.

In step # 5, the ball detection sensor 21
It is determined whether or not the sphere 24 is placed on the support tool 25 or the marker 70 based on the detection information of 1., and if the sphere 24 is not on the support tool 25 or the marker 70, the load corresponding to the entire body is obtained. The center of load and the center of load corresponding to each of the left and right 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, arithmetic processing is performed to determine the load center corresponding to the whole body and the load center corresponding to each of the left and right feet. Is calculated (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, and the ratio of the load of the left and right feet to the total load (that is, ,
WL / WT and WR / WT) are calculated and displayed in the display columns 52 provided at the left and right ends of the display screen of the graphic display device 4a as ratio display points 53 so that the larger the ratio value is, the higher the ratio is. ). In the display example of FIG. 9, the reference locus display mode is selected in step # 1. After performing this screen control, the console 34
It is judged whether or not the mode change switch of is pressed (step # 17), and if it is pressed, the process returns to step # 1 and the operation mode can be set, and if not pressed, the process proceeds to step # 5. Return.

In step # 5, the ball 24 is moved to the support 2
5 is placed on the marker 70 or the marker 70, the device is in a reset state, load data of a new swing is collected, the data is calculated, and the load center and the left and right feet corresponding to the whole body are collected. The collected data is stored in the storage device 3 while the load center etc. corresponding to each is displayed in real time.
Remember in 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 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 judged whether or not the swing has already ended depending on whether or not a predetermined time has passed from the impact point (step # 10), and if the predetermined time has not passed, step ## Return to position 7. When it is judged that the swing has already ended after a predetermined time has passed from the impact point, as shown in FIG. 10, the movement locus 55 of the load center of the whole body and the left and right feet of the completed swing are shown. Moving trajectory 5 of the corresponding load center
6, 57, the load ratio locus 71 of the whole body, and the foot shape f are displayed (step # 11). In addition, on the movement locus 55 of the load center of the whole body, marks 59 to indicate each characteristic point (address, swing start, body turn start, top, swing down, impact, and finish points).
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 loci 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 value at the address, and a ratio of the right foot load to the subject's weight value at the top position. And a top right foot load ratio 67 indicating the above, and an impact left foot load ratio 68 indicating the ratio of the left foot load to the weight value of the subject at the impact point are displayed (step # 11). Note that, similarly to FIG. 9, FIG. 10 also shows a display example when the reference trajectory display mode is selected, and the display of the ratio display point 53 in the display column 52 indicates the state of the impact point. There is. After that, the operator can operate the console to switch the display of the graphic display device 4a to the display as shown in FIG. 11 (step # 11).

Further, as shown in FIG. 12, when the reference locus display mode is selected, the data 71 of time change of the load ratio of the whole body and the data 72 of time change of load ratio of the reference locus data are selected. And are displayed on the plotter 4b so that the impact time points coincide with each other (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 indicate each characteristic point (swing start, body turn start, top, swing down, impact, and finish). 65 is displayed, and the characteristic points (swing start, body turn start, top, swing down, impact, and finish points) are 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. Further, the display of the load center on the graphic display device 4a displays the data from the swing start point to the finish point, the data 71 of the time change 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 displayed so as to display data for a predetermined time before and after the impact point.

After that, if the measured load and load center data are not saved, the process returns to the position where the presence or absence of the sphere 24 is detected, and if saved, the measured data is transferred to the data save 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-described embodiment, among the plurality of characteristic points, the three characteristic points of the swing start point, the top position, and the impact point are divided into a pair of the swing start point and the top position, and a pair of the top position and the impact point, The load centers of the left and right feet of each set are displayed for each set in a state of being associated with the positional relationship on the swing base 1 as shown in FIG. 11, but the combinations and display methods are various. Can be changed. For example, another set of characteristic points may be displayed, or the foot shape f or the straight line N may be stopped and only the load centers of the left and right feet may be displayed. In FIG. 11 of the above-mentioned embodiment, the load center (for an ideal swing) and the load ratio for comparison (in an ideal swing) for each set are displayed in each column so that the load center for an (ideal swing) is compared. The difference between the load ratio and the load ratio may be determined for each set.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

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

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

FIG. 3 is a block diagram of a golf training 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.

[Figure 7] Footprint creation explanatory diagram

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

FIG. 9 is a display example according to an embodiment of the present invention.

FIG. 10 is a display example according to an embodiment of the present invention.

FIG. 11 is a display example according to the embodiment of the present invention.

FIG. 12 is a display example according to an embodiment of the present invention.

[Explanation of symbols]

 1 Swing Table 4 Display Means C Club M Load Measuring Means N Straight Line R Control Means S Characteristic Point Detecting Means

Claims (2)

[Claims] 1. A swing base (1) on which a subject who swings while gripping a club (C) is placed, load measuring means (M) for measuring the load center of each of the left and right feet of the subject, and three points in a ball striking action. On the swing table (1), the characteristic point detecting means (S) for detecting the above characteristic points and the load centers of the left and right feet of the respective characteristic points detected by the characteristic point detecting means (S) are set. A ball hitting practice machine provided with a control means (R) to be displayed on the display means (4) in a state of being associated with the positional relationship, wherein the control means (R) includes the three or more characteristic points, The hitting ball is configured to be divided into a plurality of groups with the two characteristic points whose elapsed times are adjacent to each other and to be displayed on the display means (4) in a state where the plurality of groups are arranged so as not to overlap each other. Action training machine. 2. The batting action training machine according to claim 1, wherein the control means (R) is configured to display a straight line (N) connecting load centers of the left and right feet at each of the characteristic points.