JPS5922579A - Apparatus for monitoring posture of ball game racket - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention particularly relates to a device for monitoring the posture of a racket used in ball games such as tennis, badminton, and golf.

When learning ball sports such as tennis and badminton, it is important to accurately control the racket according to a predetermined pattern and maintain a typical posture.

For example, when performing a normal forehand stroke in tennis, the following successive steps are taken: basic posture;
This is the return to the basic position after completing the drawback movement, drive movement, and pole-hitting drive movement.

If the - of these stages is not perfect or if there is an incomplete posture in some parts, the stroke operation button is often defective.

On the other hand, when operating a racket, it is difficult for the player to recognize whether or not the stroke motion was performed accurately. Furthermore, it is even more difficult to recognize when there is an imperfection in a part of the stroke motion.

SUMMARY OF THE INVENTION An object of the present invention is to provide a monitor device for observing the posture of a racket for ball games, and to use the monitor device for observing the posture of a racket to tell a player whether or not the racket is being operated accurately with a predetermined ohm. can give information. The purpose of this is to equip a monitor device that detects the posture of a racket for ball games with a large number of signal transmitters, and to use each of the signal transmitters to respond to the component of force that corresponds to the posture of the racket when a stroke is made with the racket. This is achieved by providing a signal to be transmitted. Signals sent from a large number of signal transmitters are processed appropriately, and information as to whether racket If and systotrophic operations were performed correctly or not is provided, and several types of displays are performed.

This display signal may be an acoustic or optical signal.

In a second embodiment of the invention, it is arranged that after each stroke, if this stroke is performed correctly, a short acoustic signal is generated. According to a further embodiment of the invention, a signal is emitted from a plurality of signal transmitters during a stroke operation, and this signal is stored and displayed separately, so that part of the stroke operation is performed incorrectly. It is also possible to recognize that Also, at this time, preferably, the stored signal is automatically erased and the display on the display device is also erased before the next stroke operation is started.

In addition, in a further preferred embodiment of the invention, it is arranged that the forces generated during the stroke movement of the racket are included in the various signals emitted by the signal transmitter.

The accelerating force generated during this stroke operation causes at least one timing signal generating member to operate, so that it generates a signal precisely corresponding to the stroke operation.

Other objects and advantages of the present invention will become apparent from the description of the preferred embodiments taken in conjunction with the accompanying drawings.

The invention will be described in detail below with reference to embodiments shown in the accompanying drawings.

Referring to the drawings, as shown in FIG. 1 in particular, a monitor device α2 according to the present invention is detachably attached to a gripping hand of a tennis racket θ0 via a clamp member α surrounding the gripping hand. has been done. The monitor device a2 itself consists of a housing, a four-position switch (2), and a display screen (to), and is configured to be small and lightweight. Further, the monitor device can be operated in various ways by operating the switch α0, as will be described later. The display screen (l~ is configured to display a signal indicating that a basic stroke operation has been performed.For example, in the case shown in the figure, the display screen (to) has three screen parts (18a). , (18b) , (1
8c). The screen section (18a) determines whether or not the player took the basic posture before starting the stroke motion, that is, whether the posture of the racket was in the basic posture immediately before the stroke motion. 1sb), whether or not the posture of the racket was correct during the stroke motion, and the screen part (18c)
), the draw pack operation and drive operation are correct,
and whether it has been done for a long enough time.

In this case, according to another embodiment (not shown), the monitor device (12) is a separate part from the grip of the racket QO, but is not made removable from the grip, but is a part of the grip. It is integrated into the handle to form a part.

Referring to Figures 2a and 2b, the monitor device a has a housing (a) containing a plurality of signal transmitters 1 to 2.
Each of the signal transmitters I to (3) is provided to operate in accordance with the force component, and can indicate the attitude of the racket and the trajectory taken by the racket during a stroke operation by transmitting signals. Signal transmitter I! , ■ forms a unit, and the unit includes a solid ball (a) forming a heavy body, a guide portion extending in the longitudinal direction of the housing (to) and movable in the longitudinal direction of the ball (a). (Incorporated) and a guide part (1) which is branched and curved at one end of the guide part (end), and has a wing. Each of the guide parts (c)
, (1) and (c) are provided with a pair of contacts that are energized by the ball (a), and each of the contact pairs is filled with, for example, a protective gas. A so-called reed switch can be used, which can be energized by a ball (a) made of a permanent magnet. Said contact pair functioning as a sensor can be an electromechanical switch as described above, but can also be used, for example, with a variable resistor,
Other types of sensors may be employed, such as electrical piezo transmitters. Said signal transmitter I.

(2) and (3) are guide portions (c) corresponding to each of the signal transmitters.

When the ball (A) is located at the end of the wire, a signal can be sent. In this case, the ball (A) is displaced to the guide portion Q, (A), and (-) by its own weight and internal stress such as centrifugal force generated during the stroke motion of the racket.

The signal transmitters m, rv, and v also form a unit,
The unit includes a ball, a guide part (7) extending perpendicularly to the longitudinal direction of the housing wall, and a guide part (A) branching from the guide part (7) in a perpendicular direction and extending in the longitudinal direction of the housing (A). Equipped with At the closed ends of the guide parts (1) and (2), the above-mentioned transmitter I,
Similar to the unit consisting of M and ■, a pair of contacts energized by ball ■ is attached, and the pair of contacts and ball ■ also correspond to the signal transmitters I and W described above.

It is configured in the same way as the unit ①. Also, like the ball (A) above, the ball (B) can be moved by its own weight and internal stress such as centrifugal force generated during the stroke motion of the racket, and depending on the attitude of the racket, the signal transmitter m,
, v is energized.

The signal transmitter (■) consists of a tube-shaped guide part 2 extending in the longitudinal direction of the housing (A), a somewhat heavy contact body suspended from a tension spring (2), and the contact body (2) K.
It has two contact points θ arranged opposite to each other, one of which is fixed to one end of the compression spring 〇, and the other end of the compression spring 〇 is a guide portion (to). is held at the closed end of the Still, the contact body (l) and the contact (6) are connected to an electrical connection led out from the housing of the signal transmitter (1) via the spring connection (-). The tension springs are arranged at a predetermined distance apart and are extended until a large accelerating force comes into contact with the contact body (4 dK).

On the other hand, the compression spring ■ acts as a balance spring, and the contact body (to)
This prevents excessive pressure contact between the contact point θ and the contact point θ.

In addition, the signal transmitter ■ is linked with an electromechanical acceleration signal converter such as a potentiometer P shown in FIG.
The slider of the potentiometer P is provided so as to correspond to the position of the contact body within the guide portion (G). That is, the contact body is connected to the slider of the potentiometer P. Therefore, if a steady voltage is applied to the two tangential parts of the potentiometer P, a voltage signal proportional to the acceleration force acting on the contact body between the connecting part and the slider will be sent out from the signal transmitter ■. obtain. This analog voltage signal generated during racquet movement is sent to a processing circuit, described below, which allows different signals to be distinguished to represent the amount of racquet movement.

The monitor device shown in Fig. 2a (121 balls (a), ■
The position of the contact point corresponds to the posture of the racket immediately before the stroke motion sketched in the same figure. In this case, the switches of signal transmitters I and V are closed, and the other transmitters I and V are closed.
The V, W, ■ switches are open. As mentioned above, FIG. 3 shows the transmitted waveform when the switch is opened and closed depending on the attitude of the racket. In the figure, the horizontal axis indicates the time until the end of the racket's stroke motion.
On the other hand, the level a1m on the vertical axis indicates that the signal transmitter switch ~1 is in the closed state, and the level ``'θ'' indicates that the switch is in the open state. For example, the basic posture immediately before the stroke operation shown in FIG. 2a is expressed between times t0 and I1.

Similarly, as shown in FIG. 2b, during draw pack operation, the signal transmitter switches (1) and (2) are closed, and the other switches are opened. In other words, the ball moves during the draw puck action, and the centrifugal force acts on the ball (A).

The bow moves toward the tip of the racket αG, in other words, toward the gut. At this time, as in the case of a so-called slice stroke operation, since the surface of the racket Q (J) is not perpendicular to its longitudinal direction but is inclined, the racket α0 monitor device (121) When the movement is performed, a centrifugal force is generated.As a result, a force is exerted on the ball (22, K, H+-/l/The iron is moved to the guide part (2), and the ball (A) is moved to one of the curved guide parts.This draw pack operation is performed from time t1 to I2 in FIG. It is expressed between.

Figure 2c shows when Racket QQ is in drive operation. This drive operation' is based on the time series 1it in Figure 3.
2 to I4, resulting in a force in the same direction as that produced during the drawback operation of FIG. 2b.

In theory, this drive motion is stronger than the drawback motion, so the force applied to the ball is greater.

Therefore, in addition to the signal transmitters (2) and (2), the contacts of the signal transmitter (2) are displaced, and the switch is closed. The slider of the potentiometer P is also displaced in accordance with the displacement of the contact body (4υ). It will be held at time t3%, that is, approximately between time t2 and I4.

2d is the racket) (This shows when 10 is in the final stage of the drive operation, that is, in the so-called follow-through operation, and is shown between times t4 and t3 in FIG. 3. This operation is Since this is a follow-up operation to the drive operation shown in Fig. 20, the forces that acted in the previous stage continue to act on the balls (22+, This is the same as the drive operation in the previous stage.

On the other hand, in this monitor device 02), when C1O is completely rotated by 180' with respect to its longitudinal axis, unlike the activation of signal transmitters V and ■ described above, signal transmitter IV
, W will be energized as will be readily understood by those skilled in the art.

Also, if the monitoring device (I2) operates as shown in Figures 2a and 2a, it will not be possible to hit a sliced or chopped ball (racket) (10 is rotated without being held perpendicular to its longitudinal axis). On the other hand, if the racket oo is held perpendicular to its longitudinal axis during play, the switch of signal transmitter V is closed during play, and on the other hand, the switch of signal transmitter ■ is closed. Unlike this, in the case of a slice stroke, the open and close states of the switch vary.

In order to determine various signal sending states in strokes such as rallies and services, the ball (a) is used.

■It is sufficient to determine the force acting on the contact point. That is, the operating direction of the balls (A), (2) and the contact body is determined as described above depending on the forces applied to the balls (A), (2) and the contact body.

The digital processing circuit shown in FIG. 5 is equipped with signal input terminals I to 2, which are connected to signal transmitters 1 to 2 and are indicated by the same reference numerals as the transmitters. One terminal of each input terminal C to C is grounded, and the other terminals are connected to a positive power supply via a high resistance. Depending on the open/closed states of the switches associated with each of the signal transmitters, either zero potential or a voltage signal of +5V, for example, is applied to the input terminals I to (2).

The corresponding input terminal of the signal transmitter IK is directly connected to the set terminal of the flip-flop circuit FF2, and via the inverter 1 to the set terminal of the flip-flop circuit FFl. the Noritsubu flop circuit FFI,
The Q output terminal of FF2 is connected to the two-power terminal of AND circuit Gl, and the output terminal of AND circuit Gl is connected to NAND circuit G4.
is connected to the first input terminal of. Also, the AND circuit G
The L output terminal is connected to the set terminal of the flip-flop circuit FF4, and the Q output terminal of the flip-flop circuit FF4 is connected to control the display device D1. In this case, the display device D1 is, for example, a display screen (
(to) screen portions (18a) to (18c). Further, the display device Dl may have a symbol that is illuminated, or may have a symbol that is erased. The input terminal corresponding to the signal transmitter ■ is connected to the set terminal of the Noritsu flop circuit FF3,
It is connected to the input terminal of the AND circuit G2, and also to the control terminal of the monostable multivibrator MVI whose operation time can be set. The monostable multivibrator M
The output terminal of VI is connected to AND circuit G via inverter E2.
2 to the second input terminal. On the other hand, the Q output terminal of the 7 lip 70 tube circuit FF3 is connected to the first input terminal of the three input end AND circuit G5, and the second input terminal of the AND circuit G5 is connected to the output terminal of the inverter E2. , and the third input terminal is connected to the output terminal of the NAND circuit G4.

The output terminal of the AND circuit G2 is a three-input terminal NAND circuit G.
It is connected to the second input terminal of the flip-flop circuit FF5, and also to the set terminal of the flip-flop circuit FF5. The Q output terminal of the flip-flop circuit FF5 is connected to control a second display device D2 corresponding to the screen portion (18b) shown in FIG. 1, for example. The display device D
2, a liquid crystal display that operates with low power as described above can be used.

The input terminal corresponding to the signal transmitter ■ is connected to the third input terminal of the NAND circuit G4 via the switch Swl, and is also connected to the set terminal of the flip-flop circuit FF6, and the Q output of the flip-flop circuit FF6. The terminal may correspond to the screen portion (18c) shown in FIG.
is connected to control the display device D3. In this case, the switch SW is in the 1-slice position corresponding to the slice stroke operation as shown in FIGS. 2a-2d. The switch SW may also be in the "normal" position as shown in the figure. This position corresponds to a normal stroking operation in which the racket is held at right angles to its longitudinal direction. through the switch,
The output terminal of the OR circuit G3, one input terminal of which is connected to the input terminal corresponding to the signal transmitter (2), is connected to the third input terminal of the NAND circuit G4 and the set terminal of the flip-flop circuit FF6. The other input terminal of the OR circuit G4 is connected to a corresponding input terminal of the signal transmitter V.

The signal input terminals corresponding to the signal transmitters ■ and ■ are connected to two input terminals of another OR circuit G8, and the output terminal of said OR circuit G8 is connected to an AND circuit G7 and controls the monostable multivibrator MV2. Connected to the input terminal to control the operating time. The AND circuit G7 further has two input terminals. The input terminal - is connected to the Q output terminal of the flip-flop circuit FF3 via the inverter 3, and the other input terminal is connected to the monostable multivibrator MV via the inverter 4.
2 output terminals are connected.

The output terminals of the AND circuits G5 and G7 are respectively connected to two input terminals of the OR circuit G6, and the output terminal of the OR circuit □G6 is connected to control the acoustic signal transmitter B. The acoustic signal transmitter B may be, for example, a small speaker, a buzzer or an electromechanical acoustic converter such as a piezoelectric transducer. On the other hand, the acoustic signal transmitter B
Alternatively, a visual signal emitter, such as a photodiode, for example, can also be used.

The output terminal of the multivibrator MV2 is also connected to the control input terminal of the monostable multipipe lake MV3 via an inverter 4,
The output terminals of 3 are connected to control a 1-noset circuit, and the 1-noset 1 circuit transmits a short voltage pulse. The short voltage pulse is applied as a reset signal to the R input terminals of all 7 lip-flop circuits FFI to FF6. connected,
The clip-flop circuit is preferably reset.

The monostatic multivibrators MVI, MV2 are appropriately set by the voltage signal detected by the slider of the potentiometer P. Said signal is integrated in response to the displacement of the racket, for example by a capacitor C connected to the slider of a grounded potentiometer P.

The operation of the processing circuit shown in FIG. 5 is explained in Section 3. This will be explained along with FIG. Third. In addition to the operating states of signal transmitters ■ to ■, FIG. 4 shows multivibrators MMl, MV2,
The respective operating states of MV3, signal transmitter B and 6 noset 1 circuit are shown.

Flip-flop circuit FF2 is set at time t0, while flip-flop FFI is set at time t due to disappearance of the signal sent by signal transmitter l. Flip-flop circuit FFI.

When FF2 is set, an output signal is generated from the CAND circuit Gl, the flip-flop circuit FF4 is set, and the display device D7 is operated. It can be shown that this "Kyoshi1 basic posture" is satisfactory.

At time t, the switches of signal transmitters ■ and ■ are closed. The signal given to the input terminal corresponding to the signal transmitter ■ is sent to the flip-flop circuit FF via the switch SW.
6 and the flip-flop circuit FF6 is set, thereby operating the display device D3. This shows that the racket is in the correct posture during the sly-♂ stroke, that is, in an inclined posture. The signal given to the input terminal corresponding to the signal transmitter ■ is OR circuit G.
8 to the signal input terminal of the multivibrator MV2, and the multivibrator MV2 operates.

The operating time of the multivibrator MV2 is a predetermined time from when the racket is displaced from the basic position until a complete stroke operation is performed and the racket is placed in the basic position K. For example, this operating time depends on the signal of the potentiometer P, which corresponds to a large stroke during play.
It can be as low as 1.5 seconds, or even lower, about 1.5 seconds.

At time t2, the switch of signal transmitter (2) is closed.

As a result, the flip-flop circuit FF3 is set and the monostable multivibrator MVI is set to the operating state. The operating time of the monostable multivibrator MVI corresponds to the shortest duration of the drive stroke with sufficient strength required for play and an optimum duration. Furthermore, the end of the operating time of this monostable multivibrator MVI corresponds to time t4 in FIG.

After the monostable multivibrator MVI operates for a predetermined time,
After the tennis ball is hit at time t, the @1'' level signal is sent to the surface input terminal of AND circuit G2. Therefore, flip-flop circuit FF5 is set and display device D
2 is activated and the '1' level signal is output to the NAND circuit G.
It will be applied to all three input terminals of 4. In this case, the AND circuit G5 outputs an output, and at the same time, the AND circuit G7 does not output an output, so the acoustic signal transmitter B is not activated. On the other hand, if the racket is not in the correct posture from time t0 to time t4, a short incorrect posture signal sound is emitted from the acoustic signal transmitter B after the stroke operation is completely completed.

For example, even if the multivibrator MVI is operating, if the drive operation is not performed with sufficient strength and length, the signal transmitter . . . opens. In this case, after the multivibrator MVI is activated, the 11" level signal is only given to one input terminal of the AND circuit G2, so no output is generated from the AND circuit G2. This causes the synand circuit G
An "IIl" level signal is given to the two input terminals of No. 4, while "On" level signals are given to the other input terminals, and an "1H" level output signal is sent from the NAND circuit G4, and an output signal from the AND circuit G5. As a result, an output is output from the OR circuit G6, and the signal transmitter B is driven.Suppose that the signal sound indicating that the racket is not in the correct posture at the end of the stroke operation is, for example, a short buzzer sound. , the player displays the display device DJ, D2
, D+( can confirm the inaccuracy of the stroke operation. At this time, the flip-flop circuit FF4
, FF5, and FF6 each provide a signal indicating whether the stroke operation is accurate or not to the display device.

FIG. 4 shows another manner in which the signal indicating the inaccuracy is emitted by the signal emitter B.

To explain this with reference to FIG. 4, 1. When the racket leaves its basic position at time t1, for example, when the tip of the racket is lowered, the switch V of the signal transmitter (2) is closed. As a result, after the ``1# level signal is sent out and the operation of the monostable multivibrator MV2 is completed, the 1lOI level signal is outputted from the monostable multivibrator MV2 and sent to the AND circuit G7 via the inverter E4.In this case. Similarly, the AND circuit G7 receives an I1'' level signal from the other input terminals. Therefore, the OR circuit G6 is output and the signal transmitter B is activated at the time I6 when the reset pulse is transmitted. On the other hand, if the switch of the signal transmitter ■ is opened while the monostable multivibrator MV2 is in operation, the flip-flop circuit FF3 is activated, and the Noritsu flop circuit FF30I1# level output signal, which is inverted in the inverter circuit 3, is transferred to the AND circuit G7. signal transmitter B is deenergized. The digital processing circuit preferably consists of an integrating circuit. That is, the digital processing circuit is designed to use, for example, an MO8 element, and in this case, power consumption is significantly lower. Therefore, the entire monitor device of the present invention can be constructed to be compact, simple, and inexpensive.

Another embodiment of the signal transmitter is shown in FIG.

Similarly to the above-described embodiment, the signal transmitter (Tsuru) is provided to be able to detect a force component corresponding to the attitude of the racket during a stroke operation. This type of racket is rotated in a certain direction perpendicular to the longitudinal direction of the racket in its basic position, so that after a systloof motion, the ball hits the center of the racket and spins. This six-stroke motion is normally performed during forehand or backhand, which requires different basic postures for the racket.
ts), (iJ is provided, and the guide portion Oυ2
The rings are provided with ball-shaped M mass bodies that act by centrifugal force and are movable and parallel to each other. Also two guide parts)
, 62 are located on both sides of a plane parallel to the main plane of the racket, and are provided in plane symmetry with respect to the plane. A dividing wall separating the two guide parts O◇ and I2 from each other is positioned on the plane, and the guide part -
2O are communicated with each other via a notch provided in the dividing wall. The dimensions of the notch (in the notch) are set so that a heavy body can freely pass therethrough. Further, the notch ring is located at the end of the guide part (6D, the dividing wall corresponding to the ← end), and the weight body is placed in the notch QilK when the racket is in the basic position. The notch (1) is located on the right side as shown in FIG. 6, and when the racket is in its normal basic position, the plane - is approximately perpendicular to the surface of the racket. If the racket is rotated from its basic position along the axis of the racket and the main planes of the racket are at right angles, the weight body acts in opposite directions (receives Fl or F2. When F2 is added to the ball-shaped weight body, the weight body passes through the notch Q and is moved to either the guide portion In or to the guide portion In.

Therefore, when the racket is in a drawback motion or stroke motion, the weight body is displaced in the direction of centrifugal force, and the guide portion Oυ or 12 is moved in the direction of the arrow F3.
, move to F4. A pair of contacts (61a) r is provided at the end of the guide portion Iυ, 6, on the opposite side of the notch.

(6xb), (62a), and (62b) are attached, and each pair of contacts is electrically connected when the weight body wheel comes into contact with them. In this case, the weight is preferably coated, for example, with a suitable conductive material.

For example, the heavy body has contact points iJ' (61a), (61b
), and (62a) and (62b) may be plated with gold to ensure good contact. The signal transmitter shown in FIG. 6 can also be used in combination with the signal transmitter shown in FIGS. 2a to 2d above.

FIG. 7 shows yet another embodiment of the signal transmitter. The signal transmitter in FIG. 7 is equipped with a weight body (c) made of a bar-shaped magnet that acts by centrifugal force, and the bar-shaped weight body f3
is disposed in the guide part (7◇) so as to be displaceable in the longitudinal direction.The illustrated guide part (c) shows only the end part.Furthermore, a rod-shaped permanent A magnet) is disposed, and the permanent magnet is disposed such that the magnetic poles of the weight body (c) repel each other. Further, the rod-shaped permanent magnet (2) is arranged so as to be displaceable in the longitudinal direction at the end of the guide part (C), and is adjusted to a predetermined position via an adjustment screw (C) that can be operated from the outside of the guide part (C). Can be fixed in position. One end of the adjustment screw 1741 is engaged with the permanent magnet (a) K, and the other end is screwed into a screw hole provided in the end face f of the guide portion Q◇. On the other hand, the guide part (c)
A reed switch (c) is disposed at the end of the reed switch (c) at a slight distance from the end, and the reed switch (c) can be biased by a rod-shaped permanent magnet. In this case, the magnetic repulsion between the permanent magnet (a) and the weight body (c) acts as if a compression spring were interposed, and the same function as the spring body shown in FIGS. 2a to 2d can be obtained. Therefore, depending on the force that the player applies to the racket, the weight body f3 moves to the reed switch 17.
By adjusting the longitudinal position of the permanent magnet (2) using the adjustment screw f4, the time at which the reed switch (c) is energized can be changed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a monitor device according to the present invention applied to a tennis racket, FIGS. 2a to 2d are explanatory diagrams of the operation of the device, and FIGS. 3 and 4 are operational waveform diagrams of the device.
FIG. 5 is a partial detailed circuit diagram of the same device, and FIGS. 6 and 7 are simplified explanatory diagrams of other embodiments of the present invention, respectively. lO...Racket, 12...Monitor device, 14...
Clamp member, 16...Switch, 18...Display screen, 18a, 18b, 18c...Screen part, 20-...Housing, 22...Pole, 2
4, 26, 28. 30.32...Guide part, 34...Ball, 36.
...Guide part, 38...Tension spring, 40...Contact body, 42...Contact, 44...Compression spring, 60...Signal transmitter, 6162...Guide part, 61a, 61
b, 62a, 62b - contact pair, 63... heavy body, 64... plane, 65... dividing wall, 66... notch, 71... guide part, 72... permanent magnet 73.・
- Weight body, 74... Adjustment screw, 76... Screw hole, 78
...End face, 79...Reed switch (

Claims (1)

[Scope of Claims] (1) A plurality of signal transmitters are provided, and each of the signal transmitters is provided so as to be able to send out a signal in accordance with a force component corresponding to the posture of the racket during a stroke operation of the racket. A monitor device characterized by: (2) Claim 1, characterized in that the signal transmitter is disposed on a nozzle that can be fixed to the racket.
Monitoring device as described in section. (3) The monitor device according to claim 1, wherein the signal transmitter is attached to a part of the racket. (4) The signal transmitter includes a weight body that acts by centrifugal force, and the weight body is provided so as to be movable to a predetermined guide portion depending on the component of the force, and the sensor is provided so as to be biased by the weight body. A monitor device according to any one of claims 1 to 3. (5) The monitor device according to claim 4, wherein the sensor is an electric switch energized by a weight body. (6) The monitor device according to claim 1, wherein the weight body acting by centrifugal force is a permanent magnet, and the sensor is a reed switch filled with protective gas. (7) Any one of claims 1 to 6, characterized in that at least - of the signal transmitter includes an electromechanical transducer that sends out a signal in response to acceleration. Monitoring device as described in section. (8) The signal transmitter includes a transmitter that transmits a signal when the ball game racket is in its basic position, and a transmitter that transmits a signal when the racket is driven with minimal acceleration. A monitor device according to any one of claims 1 to 7. (9) The monitor device according to claim 8, wherein the signal transmitter is provided with a transmitter that generates an analog 'signal representing the acceleration occurring during the driving operation of the racket. The monitor device according to claim 8 or 9, wherein the 00 signal transmitter is provided with a transmitter that transmits a signal indicating that the racket is rotating at a certain angle with respect to the longitudinal direction of the racket. . Claims 1 to 10, wherein the Oυ signal transmitter is equipped with a transmitter that sends a signal indicating that the racket is rotated at a certain angle with respect to a direction perpendicular to the longitudinal direction of the racket. A monitor device according to any one of paragraphs. 02 Claims 1 to 11, comprising an electronic processing circuit to which the signal transmitted by the signal transmitter is applied so as to produce at least a negative indicator signal representing the movement of the racket. The monitor device according to any one of the following. 13. The monitor device according to claim 12, wherein the display signal sent from the αJ processing circuit is an acoustic or optical signal. (14) Claim 1, characterized in that when an incorrect racket movement is detected by a signal sent from a signal transmitter, a display signal is sent from a processing circuit.
The monitor device according to item 2 or 13. 14. The monitor device according to claim 12 or 13, wherein a display signal is sent from the processing circuit when accurate racket movement is detected by the signal sent from the αG signal transmitter. (To) The signal sent out by the signal transmitter is given to a digital logic circuit, and the digital logic circuit is used for various functions such as maintaining the basic posture before the stroke operation, accurate drawback operation, and accurate drive and drive operation. A monitor device according to any one of claims 12 to 15, wherein the monitor device is provided with signals corresponding to different stages of a series of racket movements to generate a display signal. 17. The monitor device according to claim 16, further comprising an αη signal storage circuit, and is arranged such that the signal storage circuit stores the display signal detected during the systotrophic operation. (to) represents a stage of racket operation in which at least a signal sent by a signal transmitter is applied to a storage circuit, and said storage circuit is provided to be resettable after the racket operation is completely completed. A monitor device according to claim 16 or 13. Sent by a9 signal transmitter (i.--7);
Given as the control input of the timing element, Mi [the timing element is completely open and open for 7 racket movements, and the digital logic 1u path indicates the accuracy and inaccuracy of the racket movement after the timing element Q operation time. A monitor device according to any one of claims 16 to 18, wherein the monitor device is arranged to generate a display signal representing the current state. (4) The operation and time of the timing element is 1 electric machine IJ9
14. A monitor device as set forth in claims 7 and 13, which is provided so as to be adjustable according to an output signal of a conversion heater. c21) The signal storage circuit is the timing element rib ff 1
14. The monitor device according to claim 18, wherein the monitor device is reset when a display signal indicating accuracy or inaccuracy of racket operation occurs after a clear day. (a) At least a negative input terminal 75 of the logic circuit; provided exclusively for connection to different signal transmitters via switches, and provided so that the position of the switch corresponds to a predetermined mode of racket operation. The monitor device according to any one of claims 15 to 21, characterized in that: A patent characterized in that the position of the hand switch is made to correspond to the normal hand movement, volley movement, service movement, and stroke movement during competitions. The monitor device according to any one of claims 1 to 23.
Tsuku hand stroke operation, effective phono 1nd, (
Claims 12 to 12 are characterized in that they are provided so as to correspond to the conflicting force components of the racket, which represent the attitude of the racket in the basic position required for the hand stroke operation. 24. The monitor device according to any one of item 23. (a) The signal transmitter is equipped with two guide parts on which a heavy body acting on centrifugal force can be moved, and the guide parts are opposed on both sides of a plane parallel to the main plane of the racket, and The weight bodies are disposed symmetrically with respect to each other, are separated from each other by a dividing wall included in the parallel plane, and communicate with each other via a notch in the dividing wall, and the notch is provided with a movable weight body. The end of the guide part corresponds to HK! 25. The monitor device according to claim 24, wherein the weight body is located at an end of the wall so as to be able to stand still when the racket is in the basic position. A permanent magnet having a magnetic pole is disposed at least at the negative end of the guide part, and a weight body made of a permanent magnet and a permanent magnet having the magnetic pole are provided so as to be able to repel each other at the end of the guide part. A monitor device according to any one of claims 6 to 25. 27. The monitor device according to claim 26, wherein a permanent magnet disposed at an end of the slope guide portion is positioned in the longitudinal direction so as to bias the switch.