KR19990025762U - Indoor automatic tennis exercise device - Google Patents

Abstract

The present invention relates to a device that can automatically practice tennis practice indoors, more specifically, can automatically practice tennis practice indoors, and by adjusting the direction of the ball by grasping whether the ball hit the target point accurately. The present invention relates to an improved indoor tennis practice device that can easily double tennis skills.

The present invention is a device in which the net is installed in the center of the indoor space to perform tennis exercises indoors, the ball thrower to throw a tennis ball to the exerciser located on the opposite side of the net; An electric sensing target plate for detecting that the tennis ball is hit at the hitting target point by transmitting the electric signal by contacting each other with the front and rear plates made of a conductor when the tennis ball hit by the exerciser hits the racket; A numeric display board which outputs such a signal to the outside as a number based on a signal transmitted from the electronic sensing target plate; A ball lifter for automatically shifting the tennis balls to a predetermined height and supplying the tennis balls to the ball thrower through a ball input pipe; It supplies power to ball input pipe, ball thrower, electronic sensing target plate, numeric display board, ball lifter, and automatically operates them to throw tennis balls continuously to the trainees, and the tennis ball hit by the player with the racket is electronically detected. When the target plate is fitted, the control device for operating the numeric display board to output it to the outside as a number; provides an indoor automatic tennis exercise apparatus comprising a.

Description

Indoor automatic tennis exercise device

The present invention relates to a device that can automatically practice tennis indoors, and more specifically, can automatically practice tennis indoors, as well as to determine whether the tennis ball hit by the practitioner hit the target point accurately and hit the ball. It relates to an improved indoor automatic tennis practice device that can easily double the tennis skills by adjusting the.

In general, a tennis court has a game room with a net installed on the side and a practice board with a wall board installed on the side. If you are a beginner (including an inexperienced person), you will use the wall board to practice the feel of the tennis ball, the direction of the ball and the oral cavity. In this way, if you practice tennis in the practice field, beginners are not able to control the ball with the racket, so they are busy to pick up when the ball breaks away from the practice field, and if this breakup is repeated, the enthusiasm to practice tennis cools up easily.

Therefore, in order to improve this point, conventionally, the tennis instructor throws the tennis practice ball to accept it. However, this method is easy to catch the tennis practice, but there is a problem that it is difficult for beginners to learn tennis in the situation that there is no supervisor who will continue to practice.

The present invention is to solve the conventional problems as described above, the purpose of the person who wants to learn tennis or exercise for the health and players who want to further improve their skills as a player hit the tennis ball indoors It is to provide indoor tennis practice device that can learn tennis efficiently and easily by enabling direction, hitting feeling and comprehensive practice.

1 is a block diagram showing the overall indoor tennis practice apparatus according to the present invention;

2 a and b) is a diagram showing the internal configuration of the ball thrower equipped with the indoor automatic tennis exercise apparatus according to the present invention;

3 a) and b) is a configuration diagram for showing the rotation state of the ball thrower equipped in the indoor automatic tennis exercise apparatus according to the present invention;

4 is a configuration of the electronic sensing target plate equipped in the indoor automatic tennis exercise apparatus according to the present invention;

Figure 5 is a cross-sectional view of a ball lifter equipped in the indoor automatic tennis exercise apparatus according to the present invention;

Figure 6 is a side sectional view of a ball lifter equipped in the indoor automatic tennis exercise apparatus according to the present invention;

7 is a cross-sectional view taken along the line A-A of FIG.

8 is a block diagram of a ball input pipe provided in the indoor automatic tennis exercise apparatus according to the present invention;

9 is a circuit diagram of a controller equipped in the indoor automatic tennis exercise apparatus according to the present invention;

10 is a circuit diagram of a coin machine equipped with the indoor automatic tennis exercise apparatus according to the present invention;

11 is a circuit diagram of the electronic sensing target plate equipped in the indoor automatic tennis exercise apparatus according to the present invention;

12 is a power circuit diagram of the indoor automatic tennis exercise apparatus according to the present invention;

Figure 13 is a pneumatic circuit diagram for the drive cylinder of the indoor automatic tennis exercise apparatus according to the present invention;

14 is a block diagram of a program motor equipped in the indoor automatic tennis exercise apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

5 ..... net 7 ..... Tennis Ball

10 .... Ball Thrower 11 .... Casing

20 ... Limit switch (for subtraction) 22 .... Rotary ball

26 .. Angle adjustment plate 30 .... Drive cylinder

34 .. Shore 40 .... Electronic sensing target plate

48..Pressure plate 53 .... Buffer

55-1,55-2 ... lamp 62 .... net

65 ... ball lifter

100 ... controller 124 ... air-controlled magnetic contactor

In order to achieve the above object, the present invention, a net is installed in the center of the indoor space in the apparatus that can practice tennis indoors, ball thrower to throw a tennis ball to the exerciser located on the opposite side of the net ; An electric sensing target plate for detecting that the tennis ball hit the target plate by transmitting the electrical signal by contacting each other with the front and rear plates made of a conductor when the tennis ball hit by the exerciser hits the racket; A numeric display board which outputs such a signal to the outside as a number based on a signal transmitted from the electronic sensing target plate; A ball lifter for automatically shifting the tennis balls to a predetermined height and supplying the tennis balls to the ball thrower through a ball throwing pipe; and, the ball throwing machine, an electronic sensing target plate, a number sign board, and a ball lifter Control device for supplying the ball, automatically operating them to throw the tennis ball to the trainee continuously, and if the tennis ball hit by the trainee hits the electronic sensing target plate, operate the number signboard to output this number to the outside. By providing an indoor automatic tennis exercise device characterized in that it comprises a.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Indoor tennis apparatus 1 of the present invention is a ball throwing to throw a tennis ball (7) continuously or intermittently to the exerciser (H) located on the opposite side of the net (5) as shown in Figure 1 as a whole When the machine 10 is mounted, the ball thrower 10 throws the tennis ball 7 to protrude at a predetermined time, which is casing 11 as shown in FIG. A pair of drive motors 12 are provided on the inner side thereof, and disc-shaped throwing wheels 14 are mounted on the rotation shafts 12a of the drive motors 12, respectively. And, the throwing wheel 14 is formed so that the ball is thrown by forming a space therebetween, the ball guide 16 for supplying the ball between the throwing wheel 14 between the drive motor 12 is formed On the lower side of the ball guide 16, the ball guide rail 18 is disposed in an inclined state, and the limit switch 20 is mounted on one side of the guide rail 18. In addition, the upper side of the guide rail 18 is equipped with a rotary ball 22 that rotates 1/4 every time one of the balls (7) is inserted, the circuit breaker so that the rotary hole 22 is only 1/4 turn ( When the magnetic contactor 124 having the 24 attached thereto is momentarily operated (reciprocating motion), after only one blade 22a of the rotary ball passes, the next blade 22b is struck by the breaker 24 and stopped to provide a single ball. Only (7) falls. The dropped ball operates the lower limit switch 20 to input an electrical signal to the deduction sensor 167 provided in the coin unit 105 for the coin. If the deduction value is 0, the coin machine and the indoor automatic tennis exercise device are stopped.

And, the front side of the guide rail 18 is equipped with an angle adjusting plate 26 for adjusting the angle of the tennis ball (7) shot from the front end of the throwing wheel (14). The angle adjusting plate 26 is mounted to enable height adjustment at the bottom of the casing 11 of the thrower 10.

On the other hand, the throwing machine 10 is a driving cylinder (30) for turning the casing (11) at a predetermined angle is mounted on the lower side of the hollow casing (11) in which the driving motor (12) is built, The drive cylinder 30 is mounted so that the cylinder body 32 is rotatable in the horizontal direction to the lower column 34, the rod 32a is rotatably mounted to the lower end of the casing 11, the casing 11 The lower end of the c) is mounted so that its center is rotatable about the shaft 36 on the top plate 34a of the strut 34. Thus, by the operation of the drive cylinder 32, the casing 11 is pivotable left and right in the horizontal direction with respect to the support 34. This is to increase the efficiency of the practice and to allow the ball (7) to be thrown to the left and right as in practice, by operating the drive cylinder 30 to the left or right and moving the thrower (10) the ball (7) is the exerciser (H) ) To the left and right.

On the other hand, when the tennis ball 7 hit by the player H with a racket hits the target plate, the plates made of conductors contact each other to transmit an electrical signal, indicating that the tennis ball 7 hit the selected target plate. Having an electron sensing target plate 40 for sensing, the electron sensing target plate 40 is disposed on both sides of the net 5, respectively, these are the support plate 42 made of a non-conductor, as shown in cross section in FIG. ), The support plate 42 has a plurality of brackets 43 extending up and down at the rear end, the brackets 43 are inclined at a predetermined angle while being connected so as to be displaced in the horizontal direction from the support 45, respectively. Has In addition, each bracket 43 is a spring 47 is mounted so that the support plate 42 is elastically maintained with respect to the support 45. On the other hand, a conductor plate 42a is formed on the front surface of the support plate 42, and a pressing plate 48 made of a conductor is mounted to face the conductor plate 42a. The pressing plate 48 is supported by the elastic member 49 at the upper and lower ends, respectively, and a plurality of protrusions 51 are formed at the rear thereof to maintain a small gap with respect to the conductor plate 42a. Between 42a, a cushioning member 53, such as a sponge, is located between the projections 51. As shown in FIG. In addition, the pressing plate 48 and the conductor plate 42a have a configuration in which the power cables 173-1 and 173-2 are connected to each other and drawn out to the outside. In this case, the pressing plate 48 and the conductor plate ( 42a) work together as a switch. The electrical contact is made when the ball 7 collides with the pressing plate 48, and the electrical contact is made to the target plate sensor 173-1 and 173-2 of the electronic detection target plate circuit diagram 41. It is sending out a signal. Meanwhile, as described above, the ball 7 collides with the outer side of the pressing plate 48 to make electrical contact with the conductor plate 42a. Then, the pressing plate 48 may be formed by the elastic restoring force of the buffer member 53. It is returned to the position to prepare for the collision of the next ball (7).

On the other hand, the lamps 55-1 and 55-2 are mounted on the upper side of the support plate 42, respectively, so that only one of the lamps 55-1 and 55-2 is selectively lit so that the practitioner ( H) has a function of setting the shot direction to hit the ball 7 toward the electron sensing target plate 40 side of the lit lamps 55-1 and 55-2.

In addition, based on the signal sent from the electronic sensing target plate 40 has a numeric display panel 60 for outputting such a signal to the outside as a number, the numeric display plate 60 can be powered through the controller 100 When the electrical signal is sent from the electronic sensing target plate 40 by being connected to the electronic sensing target plate 40, the electronic device counts and integrates the electronic signal to output it as a number. Numeric scoreboard 60 in this manner is typically available in the art, more detailed description thereof will be omitted.

And, one side of the net (5) is installed in the net 62 is inclined state, the net (62) is the net (5) side is the highest, either one is the lowest, and therefore the practitioner ( When the ball hit by H) falls to the top, it rolls toward the lowest side as a gradient.

In addition, the ball lifter 65 located at the lowest point of the net 62 automatically moves the tennis balls 7 to a predetermined height, as shown in FIGS. By supplying the tennis ball (7) to the ball thrower 10 through the), which is a shared inlet (68a) is formed on one side, a ball outlet (68b) is formed on one side, the ball outlet ( 68b) has a housing 69 that is connected to the empty dosing tube 67. In addition, pulleys 71a and 71b are disposed up and down inside the housing 69, and a belt 72 is connected between the pulleys 71a and 71b to be rotated in an infinite orbital manner. The upper side of the pulleys 71a and 71b is a driving pulley, the lower side is a driven pulley, and the upper side driving pulley 71a is formed of the drive motor 73 and the reducer 78 outside the housing 69. It is configured to be connected to the rotation shaft 73a and rotated. On the other hand, the driven pulley (71b) of the lower side has its rotation shaft (73b) extends through the long hole 74 of the housing 69, respectively, outward, the both ends of the rotation shaft (73b) each spring (76) It is configured to be elastically supported by the lower side. That is, the support shaft 75 is fitted into the rotation shaft 73b by the bracket 77 protruding from the housing 69, and the support rod 75 is equipped with a spring 76, and the support rod 75 and the rotation shaft ( 73b) is rotatably connected so that the belt 72 between the upper and lower pulleys 71a and 71b is pushed downward so that the proper tension is always maintained.

In addition, the belt 72 supports the ball 7 when the ball 7 is hooked up and the ball 7 is pulled out by dropping the ball 7 from the hook 80 to support the ball 7 in an inclined state. A plurality of ball support plates 82 are provided to direct toward the bar. The hook 80 and the ball support plates 82 are respectively provided in the front of the belt 72 so that the common inlet 68a is formed. At the side, the hook 80 is located on the upper side of the ball support plate 82 to position the ball 7 between the hooks 80 and pulls it up, and at the ball outlet 68b side, the ball (80) When 7) falls, it hits the rear inclined portion of the ball support plate 82 is guided discharged to the ball discharge port 68b.

On the other hand, the ball inlet tube 67 connected to the ball outlet 68b is made of a flexible hose, as shown in Figure 8, the upper side of the ball inlet tube 67 a plurality of limit switches (85a) ( 85b) is mounted, and one limit switch 86 is mounted at the lower end of the ball input pipe 67 connected to the ball guide tool 16 of the ball thrower 10. In the above, the upper limit switches 85a and 85b transmit electric signals in the state where the tennis balls 7 are filled in the ball input pipe 67, respectively, and the limit switch 86 at the lower side is empty. An electric signal is transmitted in a state where there is no tennis ball 7 in the tube 67. The contact rods of the limit switches 85a, 85b and 86 extend inwardly of the ball input tube 67 to play tennis. When the tennis ball 7 is present at the same time at two contact rod positions of the limit switches 85a and 85b by contacting the ball 7, an electric off signal is sent to stop the ball lifter 65, If a tennis ball does not exist at the contact bar position of the side limit switch 86, an electric signal is sent and power is applied to the ball lifter 65 to operate the ball lifter 65, and the tennis ball is introduced into the ball input tube 67. When the ball lifter is operated once, the upper limit switches 85a and 85b The tennis ball is loaded until it is activated.

Therefore, by using the electrical signals transmitted from the limit switches (85a) (85b) (86) it is possible to maintain a state in which the ball (7) is always filled in the interior of the hollow tube (67). The outgoing signal of the limit switches 85a, 85b and 86 is via the controller 100 to be described later.

On the other hand, the controller 100 for supplying power to the ball thrower 10, the electronic sensing target plate 40, the numeric display plate 60, and the ball lifter 65, and automatically operate them, the exerciser (H) ) Continuously throwing the tennis ball (7), when the tennis ball (7) hit by the exerciser (H) hit the electronic sensing target plate 40, and outputs it to the outside as a number, the ball lifter In operation 65, the entire equipment for supplying the ball to the ball thrower 10 is operated.

On the other hand, equipped with a coin machine 105 can operate the device of the present invention.

The controller 100 is an electric circuit diagram as shown in detail in FIG. 9, which uses 220 volts of power and shuts off the power supply and the no-fuse Breca 110, an electricity supply confirmation lamp 112, and a coin machine 105. The timer 123 operated by the contact 128-1 of the output relay 128 of the unit 123, and the air control magnetic contactor 124 which is operated by the contact 123-2 in the timer. ), The study group limit switch 86, the momentary turn on by the relay internal switch 127 and the timer internal contact point 123-3 for the ball lifter 65 which are operated by only the coexistence limit switches 85a and 85b. The pressure switch low pressure operation contact point 129L attached to the compressor tank 121a by connecting the circuit by the ball throwing notification lamp 125 and the output relay contact 128-2 of the coin machine 105, and the high pressure operation. Operated by a compressor relay 130 which is operated at the contact point 129H, and an uneven portion of the rotating plate attached to the programming motor 131 Left and right indications operated with the limit switches 131-1 and 131-2, the solenoid valve 133, the switch 142 for left and right operation or stop of the thrower 10, and the left and right selection relay 144. Two wheel motors 12 with a condenser operated at the lamps 55-1, 55-2, the coin machine 105, and the contact 128-3 of the output relay 128, and the relay for the ball lifter. It is operated by the compressor motor 121 and the solenoid valve 133 which are operated by the lifter motor 73 operated by the compressor 127, the compressor fuse relay 120 when the no-fuse Breka 120 is turned on. It is configured to have a drive seal 30.

A circuit diagram of the coin machine 105 is shown in FIG. 10, and six input / output terminals are installed in a unit 123 composed of electronic components in a main body, and a power input terminal 164 and a coin input sensor ( 165, a start switch 166, a subtraction sensor 167, a coin input numerical display electronic panel 169, and a relay 128 of an output terminal which is turned on when the start switch 166 operates. FIG. 11 shows a circuit diagram 41 of the electronic sensing target plate. The power input terminal 171, the reset switch 172, and the electronic target plate sensor left 173-1 are connected to the target plate unit 170. 173-2) in parallel and selects the target plate 40 to be used by the contacts 144-2 in the left and right selection relay 144. Configured to display.

12, a circuit diagram for supplying power to the thrower drive motor 12, the ball lifter motor 73, and the compressor motor 121 is provided.

13 shows a pneumatic circuit diagram for supplying pneumatic pressure to the drive cylinder, and FIG. 14 shows the arrangement of the program motor and the uneven disc.

It will be described for the operation and effects of the present invention configured as described above.

The indoor automatic tennis exercise device of the present invention turns on the fuse lamp 112 by turning on and off each fuse (110, 120, 160) (coin 105, target plate 40). After inputting power to the coin, the coin is inserted into the coin machine 105 of FIG. 10, and is detected by the coin input sensor 165 in the coin machine circuit 105, and the digital numeric plate ( Numerical value is input to 169, and when the start switch 166 attached to the coin machine 105 is pressed, the on / off relay 128 of the output terminal of the coin machine 105 is turned on and is shown in FIG. Power is applied to each device of the controller 100 to operate the wheel motor 12 and the program motor 131 of the thrower 10.

Then, the ball control electromagnetic contactor 124 is instantaneously operated by the timer 123, and the ball is dropped one by one as the idler 22 shown in FIG. 2B is rotated by the ball load, thereby following the ball guide rail 18. Between the two wheels 14 to be rotated, the acceleration sticks out, falls out in front of the exerciser H, and the ball bounces again as the player H plays tennis with a racket, left or right target plate (40). When the selection lamps 55-1 and 55-2 of the targets are aligned with the target plate where one of them is turned on, the two electric conductors 42a and 48 of the target plate 40 are moved to the ball 7. Contact by the impact of the ball on the indoor tennis field to display the numerical value on the display board 60, the ball hit the target plate 40 falls down along the inclined net (62) ball lifter (65) Will be gathered to the side. Then, the ball entered into the common inlet 68a of the lifter 65 is caught by the ball lifting hook 80 attached to the belt 72 of the lifter 65, is raised and lowered after rotating at the top of the ball lifter 65. Falling from the hook 80 by the weight of the construction ball and hit the inclined portion of the ball support plate 82 is pushed to the ball outlet 68b of the lifter 65 to the ball inlet pipe 67 connected to the ball outlet 68b Rolling in, the ball (7) is stored in the ball inlet tube 67 by passing through the two limit switches (85a) (85b) in order to be caught in the ball hole 22 of the lower end of the ball inlet tube (67) When the ball is loaded so that the two full limit switches 85a and 85b are blocked at the same time, the lifter lay 127 of the controller 100 is turned off and the lifter motor 73 is stopped.

And, the ball accumulated in the ball inlet tube 67 is dropped by the time set by the ball one by one by the ball control magnetic contactor 124 and the ball control rotary hole 22 is thrown, the ball is continuously thrown ball When exiting from the (67) and exit the study group limit switch 86, the contact of the study group limit switch 86 connects the circuit so that the motor 73 of the ball lifter 65 is started again and the lifter 65 The ball 7 is supplied into the ball inlet tube 67, and the ball 7 is always stored in the ball inlet tube 67 so that a standby state is achieved.

And the ball is accelerated by the ball thrower (10) is thrown by the exerciser (H) by using the racket is repeated repeatedly the process of hitting the target, the compressor is the return of the output terminal of the coin machine 105 After the power is supplied to the circuit through the contact 128-2 in the ray 128, the start and stop are started by the contacts of the pressure switches 129L and 129H, and the driving cylinder 30 is stored by storing a constant air pressure in the tank. It is used when operating.

The present invention is a way to solve the problem when you want to learn tennis, but do not have a supervisor, beginners and unskilled people who want to learn tennis when using the indoor automatic tennis practice facility are adjusted to their level so that the beginners Slowly coming out in a certain direction, the ball to the skilled person jumps out quickly left and right, and the target plate 40 also changes irregularly left and right to not only skill the ball control ability with instantaneous wit and quickness, but also their own skills It can measure by the average value of the light-emitting board 60. Therefore, those who want to learn tennis and men and women who want to further improve their skills as athletes and athletes are expected to have a significant effect on improving their skills.

Claims (12)

In the device that can be installed in the center of the indoor net (5) to practice tennis indoors, ball thrower to throw the tennis ball (7) to the exerciser (H) located on the opposite side of the net (5) 10; When the tennis ball 7 hit by the exerciser H with the racket hits the target plate, the front and rear plates made of a conductor contact each other and transmit an electric signal to detect that the tennis ball 7 has hit the target plate. An electron sensing target plate 40; A numeric display panel 60 for outputting such a signal to the outside based on the signal transmitted from the electronic sensing target plate 40; A ball lifter 65 for automatically shifting the tennis balls 7 to a predetermined height and supplying the tennis balls 7 to the ball thrower 10 through a ball input tube 67; and, the balls Power supply to the input pipe 67, the ball thrower 10, the electronic sensing target plate 40 and the ball lifter (65) connected to the numeric display plate 60, and automatically operate them to exercise the exerciser (H) Throws the tennis ball (7) in succession, and when the tennis ball (7) hit by the exerciser (H) hit the electronic sensing target plate 40, the number signboard to output this number to the outside ( Indoor automatic tennis exercise apparatus comprising a; 100 to operate. The method of claim 1, wherein the ball thrower 10 is to throw the tennis ball (7) to protrude in accordance with a predetermined time, has a pair of drive motor 12 inside the casing (11), the drive Disc-shaped throwing wheels 14 are mounted on the rotating shaft 12a of the motor 12, and the throwing wheels 14 throw a ball by forming a space therebetween, and throwing between the driving motors 12. A ball guide 16 for supplying a ball between the wheels 14 is formed, and the ball guide rail 18 is disposed in an inclined state on the lower side of the ball guide 16, the guide rail 18 Indoor tennis practice device, characterized in that the one side is equipped with a limit switch 20 for the sensor. According to claim 2, the upper side of the guide rail 18 is equipped with a rotary ball 22 that rotates 1/4 every time one ball (7) is injected, the rotary ball 22 is rotated 1/4 When the magnetic contactor 124 with the circuit breaker 24 attached thereto is momentarily operated (reciprocating) by the timer 123, only one blade 22a of the rotational tool passes, and the next blade 22b passes the circuit breaker ( 24, the automatic tennis exercise apparatus, characterized in that configured to transmit an electrical signal to the controller 100 when only one ball (7) is dropped and thrown between the throwing wheel (14). The angle adjusting plate 26 is mounted on the front side of the guide rail 18 to adjust the throwing angle of the tennis ball 7 shot from the front end of the throwing wheel 14. 26) the indoor automatic tennis exercise apparatus, characterized in that the height adjustment is mounted on the lower casing (11) of the thrower (10). The driving cylinder (30) of claim 1, wherein the throwing machine (10) is equipped with a driving cylinder (30) for turning the casing (11) at a predetermined angle on a lower side of the hollow casing (11) in which the driving motor (12) is built. The drive cylinder 30 is mounted so that the cylinder body 32 is rotatable in the horizontal direction to the lower end support 34, the rod 32a is rotatably mounted to the lower end of the casing 11, The lower end of the casing (11), the indoor automatic tennis exercise apparatus, characterized in that the center is mounted so as to rotate left and right by the operation interval of the cylinder (30) about the axis (36) on the upper plate (34a) of the support (34). According to claim 1, wherein the electronic sensing target plate 40 is disposed on both sides of the net (5), each having a support plate 42 made of a non-conductor, the support plate 42 is a plurality of up and down at the rear end Bracket 43 is extended, the brackets 43 are connected to each other so as to be displaced in the horizontal direction in the support 45, the inclined mounting at a predetermined angle so as to fall into the net during the tennis ball impact, each of the brackets 43 Indoor automatic tennis exercise device is characterized in that the spring 47 is mounted to the support plate (42) with respect to the support (45) absorbs the ball impact, and is configured to remain elastic. The conductor plate 42a is formed on the front surface of the support plate 42, and a pressing plate 48 made of a conductor is mounted to face the conductor plate 42a. The lower end is supported by the elastic member 49, respectively, and a plurality of protrusions (contact points) 51 are formed on the rear surface thereof to maintain a small distance from the conductor plate 42a, and the conductor plate 42a and Between the cushioning member 53 is located between the projections 51, while the pressing plate 48 and the conductor plate 42a, respectively, the power cable 55 is connected is electrically connected to the controller 100 Indoor automatic tennis exerciser. According to claim 6, Lamp 55-1 (55-2) is mounted on the upper side of the support plate 42, respectively, The lamp (55-1) 55-2 is selectively lit, the practitioner ( Indoor H. tennis practice apparatus characterized in that the hitting direction is set to hit the ball (7) toward the electronic sensing target plate 40 side of the lit lamp (55-1) (55-2). The net (62) is installed on one side of the net (5) in an inclined state, and the net (62) is the net (5) side is the highest, either side is the lowest, the practice When the ball hit by the ruler (H) falls to the upper side, the indoor automatic tennis exercise device, characterized in that it is configured to roll toward the lowest side as a gradient. According to claim 1, The ball lifter 65 is a common inlet 68a is formed on one side of the lower side, a ball outlet 68b is formed on the upper side, the ball outlet 68b is a ball inlet tube (67) The housing 69 is connected to the upper and lower pulleys 71a and 71b are disposed inside the housing 69, and the belt 72 is connected between the pulleys 71a and 71b to endlessly. The belt 72 is rotated in the orbital manner, and the belt 72 is inclined when the ball 7 is pulled up and the ball 7 is pulled out by dropping the ball 7 from the hook 80. Indoor tennis practice device characterized in that it is equipped with a plurality of ball support plate 82 for supporting the head toward the ball outlet (68b). The upper side of the pulleys 71a and 71b is a driving pulley, the lower side is a driven pulley, and the upper side driving pulley 71a is a drive motor 73 outside the housing 69. And rotated in connection with the rotation shaft 73a of the reduction gear 78, and the driven pulley 71b of the lower side extends outwardly through the long hole 74 of the housing 69, respectively. The rotating shaft (73b) is characterized in that both sides are elastically supported to the lower side by the spring 76, respectively, so that the belt 72 between the upper and lower pulleys (71a) and (71b) is always configured to maintain an appropriate tension Automatic tennis exercise device. The air inlet tube 67 connected to the ball outlet 68b is made of a flexible hose, and a plurality of limit switches 85a and 85b are mounted on an upper side of the ball inlet tube 67. One limit switch 86 is mounted at the lower end of the ball inlet tube 67 connected to the ball guide tool 16 of the ball thrower 10, and the limit switches 85a and 85b of the upper side are provided. They each send an electrical signal indicating that the tennis balls 7 are full in the ball tube 67, and the limit switch 86 at the lower side has no tennis ball 7 in the ball tube 67. Indoor tennis apparatus, characterized in that configured to send an electric signal of the status.