KR101420085B1 - Height and direction of the ball at various speeds and capable of supplying tennis trainer - Google Patents

Abstract

The present invention relates to a tennis exercise apparatus capable of supplying a ball with various speeds, heights, and directions. In particular, the tennis exercise apparatus sorts balls and supplies one ball at a time. A pair of rotational wheels of the tennis exercise apparatus make the speed and the height of the ball various. Therefore, the tennis exercise apparatus enables a user to perform various tennis exercises such as receiving or serving a ball. The tennis exercise apparatus, according to the present invention, comprises: a ball supplying device (30) having a lower side on which a supply adjusting plate (33) is installed; a driving power supplying device (20) which supplies a tennis ball (11); and a ball location variation device (80).

Description

{Height and direction of the ball at various speeds and capable of supplying tennis trainer}

The present invention relates to a tennis training machine capable of supplying balls in various speeds, heights and directions, more particularly, to a tennis training machine in which balls are classified and fed one by one, and the speed and height supplied by a pair of rotating wheels And a tennis training machine capable of supplying balls in various speeds, heights, and directions, which enables various exercises related to tennis, such as receiving and sub-training.

When you first learn tennis, you learn forehand, backhand, and volley, but the most difficult thing for beginners is the sub.

To put the serve, throw your ball with your left hand, shake your whole body, stretch it out, hit the ball falling into the racket, and the ball goes forward.

At this time, a variety of complex physical activities such as a ball pointing at the ball, the rotation of the angle wrist of the racket face at the moment of hitting the ball, and so on.

However, when a player throws a ball with his left hand, beginners forget everything and can not adjust the ball precisely.

Also, the ball does not fall in the desired direction and the posture is disturbed. This allows the practitioner to substitute for throwing the ball so that they can learn the exact striking posture.

In addition, while practicing the various actions of tennis including the serve, it is best to spend a lot of time and practice on your own, but using a coach to do this is costly, However, since conventional exercise machines can not learn various postures and processes, there is a strong need to develop them.

The sub-machine disclosed in the publication of the Utility Model No. 1982-0001373 (published on Mar. 2, 1983) has a main body having a pressure chamber in which a compressor is charged and a tennis ball inlet and a pressure supply port are drilled, And the angle of the left and right firing points of the tennis ball is arbitrarily set by adjusting the fin to the tip of the control shaft which is connected to the upper surface of the control shaft and connected to the upper surface of the control shaft. It is not a device for putting a structure or a sub which inserts an ejection port formed with an ejection hole at the tip of the pressure chamber so as to be able to adjust the rotation,

The tennis practice machine disclosed in the Utility Model Publication No. 1995-0010322 (published on Dec. 08, 1995) has a pair of pitching rollers which are formed on the front surface of the main body and can be thrown through the launch ball A supporting plate on which guide rollers are formed on both sides of the main body and on which a pitching roller driven by a DC pitching motor is mounted and which is rotatably mounted on the guide hole with a fastening hole, one side of the connecting pin is fixed to the support plate, And a connecting rod connected to the driving rod is connected to the driving rod so that the driving rod is connected to the rotating motor by being rotatably mounted on a base plate provided with a supporting roller on an upper surface thereof so as to be rotatable around the rotating shaft. And the operation rod is inserted between the adjustment pieces, and the insertion hole is formed. The panel is fixed to the upper part of the door and the large number of holes are installed on the motor shaft so that the guide plate is positioned on the upper part of the door. , A foot switch is connected to a DC sorting motor, and it is a device for practicing the practice and stroking not the structure or the sub-trainer.

[0002] A ball drill of a ball game, which has been conventionally disclosed as a credit design registration No. 0454299 (registered on June 20, 2011), includes a support portion having a pair of frames spaced from each other and adjustable in height; And a plywood, a hard vinyl, and a net, wherein one side and the other side of each of the pair of frames are rotatably engaged with each other at an acute angle in the forward and backward directions, Wherein the supporting portion is detachably coupled to a receiving box for receiving a ball struck by the striking portion at a lower portion of the pair of frames, The present invention differs from the present invention in that the sponge is accommodated in such a manner as not to be thrown out of the receptacle, and is not for sub practice but for stroking exercise such as tennis.

The multipurpose sports swing training apparatus disclosed in the prior patent publication No. 2007-0051323 (published on May 17, 2007, 2007) is a multipurpose sports training apparatus for improving and teaching stroke and throwing techniques, And an adjustable waist belt having a second end and connecting means disposed on the first end and the second end for connecting the first end and the second end, an elastic connector having a distal end and a proximal end a resilient connector for attaching the elastic connector to the waist belt such that when the waistband is worn the clamp is attached to the waist belt such that the clamp is positioned adjacent to an iliac crest of the user's leading hip and adjustably captures the proximal end of the elastic connector one or more clamps for capturing and retaining an elastic connector, attachment means disposed on the distal end of the elastic connector, And not a device or a sub-training device characterized by comprising a sports tool / hand connection means for the player.

Documents 1. Utility Model Registration No. 0470337 (Registered on December 03, 2013) Document 2. Patent Publication No. 2011-0001269 (registered on Jan. 06, 2011) Document 3. Patent Publication No. 2002-00971713 (published on Dec. 06, 2002) Literature 4. Utility Model Notification No. 1995-0010322 (Notice of Dec. 08, 1995)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a method and apparatus for connecting a frame in one direction and adjusting the overall inclination through a tilt- .

Another object of the present invention is to provide a method for changing a position of a wheel of a pair of wheels and changing a position of the wheel in a fixed and continuous manner do.

Another object of the present invention is to provide a method and apparatus for supplying a uniform supply of the balls one by one without clogging the hopper and adjusting the supply and discharge rates at various speeds.

Another object of the present invention is to enable the ball to be practiced at various positions and types of balls such as a receiver and a bali by adjusting the height of the ball.

The present invention provides a tennis training machine in which a tennis ball is supplied to a ball storage tank formed on a lower side of a hopper,

A feed wheel for feeding one tennis ball into the feed hole from the lower side of the hopper is connected to a feed shaft of the feed motor by a belt and a feed pipe for forming a stop guide groove is formed below the feed wheel, A ball supply device having a ball stopper plate and a supply throttle plate at a lower side of the supply pipe;

And a fixed wheel connected to a fixed shaft that is rotated by a gear, and a floating wheel connected to a driving shaft connected to the power motor by a power belt is installed to supply a tennis ball A power supply device for supplying power to the vehicle;

And a position adjusting shaft connected to the flow plate provided with the flow axis is connected to the variable plate by a variable hinge and a variable shaft is rotatably connected to one end of the variable plate.

The present invention can variously supply and adjust the position of the ball by adjusting the overall inclination of the applicator through the inclination adjusting device by connecting the frame in one direction and connecting the inclination adjusting device in the other direction, It is possible to practice in various forms.

In the present invention, the wheel position of one of the pair of wheels can be changed, and when the position is fixed, the ball is supplied to the front, and when the position of the wheel is fixed and variable, So as to improve the training effect by performing the practice through the ball being supplied to various positions.

In accordance with the present invention, the balls are mixed and fed one by one without clogging in the hopper, so that the supply of the balls is smoothly performed, and balls are selected and discharged one by one and adjusted and supplied at various speeds, Can be expected.

The present invention provides a training effect through various positions and types of balls such as a receiver and a ball, by adjusting the height of the ball as a whole or adjusting the ball at a position starting from the wheel.

1 is a front view showing a preferred embodiment of the present invention.
2 is a side view showing an installation state of the present invention
Fig. 3 is a front view of the installation state of the height adjusting device and the wire wheel of the present invention
Fig. 4 is a cross-sectional view showing an operating state of the coin feeder of the present invention
Fig. 5 is a plan view showing a state in which the supply throttle plate and the blank stopper plate coincide with each other according to the present invention.
Figure 6 is a top view of the supply throttle plate for the co-
7 is a plan view of the blanking plate for the blank supplying device of the present invention;
8 is a front view of the power providing apparatus of the present invention
9 is a plan view of the power providing apparatus of the present invention
Figure 10 is a top view of the co-
Figure 11 is a side view of the co-
Figure 12 is a side view of the operative condition for the co-
13 is a front view of the height adjusting device of the present invention
14 is a plan view of the height adjusting device of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing a preferred embodiment of the present invention, and FIG. 2 is a side view showing an installation state of the present invention.

A lower end of a hollow storage tank 12, which is formed of a square or a circle and to which a plurality of tennis balls 11 are fed, is formed to be inclined like a hopper 13. A lower end of the hollow storage tank 12 is provided with a frame And a wheel 15 is installed on the bottom surface of the frame 14 so as to be movable.

The frame 14 is formed with an adjusting hinge 16 in the forward direction (a direction in which the ball is fed), and the rear side is separated from the lower side through the inclination adjusting device 60 and connected to the lower side through the connecting hinge 62.

A ball supply device 30 is provided below the hopper 13 to rotate the balls one by one and to supply the tennis balls 11 downward, and to stop the supply of tennis balls 11 and to discharge the tennis balls 11 from the lower side.

A tennis ball 11 supplied from the ball supply device 30 is provided with a pair of fixed wheels 25 rotating at high speed and a power supply device 20 for supplying the tennis balls 11 through a floating wheel 27.

The position of the floating wheel 27 is changed and the tennis ball 11 is provided in a straight line with the fixed wheel 25 so as to supply the tennis ball 11 straight. The variable device 80 is installed.

A height adjustment roller (59) installed at the center of the fixed wheel (25) and the floating wheel (27) is installed to adjust the height of the ball according to the supply of the ball or adjust the height The device 50 is installed.

The tennis training apparatus 10 according to the present invention can adjust ON and OFF by using a remote controller if necessary, and adjusts the speed of the power motor 21 to adjust various speeds, heights and widths.

FIG. 3 is a front elevational view of a height adjusting device and a wire wheel according to the present invention,

The height regulating device 60 is provided with a tilt adjustment bar 61 in the shape of a "and an upper side connected to the frame 14 and a tilt adjustment shaft 62 in the transverse direction, (63) so that the overall height and the inclination angle can be adjusted.

A wire wheel 70 with a wire 71 wound thereon is installed on one side of the height adjusting device 60 so that power can be supplied at a predetermined distance.

FIG. 4 is a cross-sectional view showing an operation state of the ball supply device of the present invention, FIG. 5 is a plan view of the ball supply device of the present invention, FIG. 7 is a plan view of the blank stopper plate for the blank feeder of the present invention. FIG.

Upper pins 38a protrude upright from one side of the supply port 37 provided at the lower end of the hopper 13 to the upper side of the hopper 13, The guide pins 38 are provided to guide the tennis balls 11 to be fed one by one to the supply port 37 while being rotated.

A feed wheel 35 is rotatably connected to a feed shaft 32 via a belt 35a at a lower side of the feed port 37. The feed shaft 32 is connected to a feed motor 31, .

The supply shaft 32 is provided with a blank stopper plate 34 on the upper side with a predetermined gap therebetween. A supply adjusting plate 33 is provided below the blank stopper plate 34, It is preferable that the distance of the throttle plate 33 is one height of the tennis ball 11. [

A supply pipe 36 is formed at a lower side of the supply port 37 to lower the tennis ball 11. A stop guide groove 36a is formed at a position where the stopper plate 34 is located. And the lower end is located on the upper side of the supply regulating plate 33.

The supply pipe 36 is connected to the pipe mounting base 36b and the front guide 39 is sloped to guide the tennis ball 11 to be discharged.

The supply throttle 33 is formed with a discharge space 33a through which the tennis ball 11 passes and a ball stopper 34 is disposed above the discharge space 33a.

A chain 81a is connected to a drive sprocket 81 to transmit the power of the supply motor 31 to a part of the supply shaft 32 and a position drive shaft 82 is connected to the drive sprocket 81 .

FIG. 8 is a front view of the power providing apparatus of the present invention, and FIG. 9 is a plan view of the power providing apparatus of the present invention.

The power supply device 20 is connected to the power motor 21 through a power belt 22 so as to rotate the power shaft 21 and is fixed to the power motor 21 via a pair of gears 23 A fixed wheel 25 is connected to the fixed shaft 24 and a floating wheel 27 is coupled to the fixed shaft 24 to rotate the fixed wheel 25 and the fixed wheel 25, And the tennis ball 11 supplied to the space between the floating wheels 27 is fed forward.

The movable shaft (26) is supported by the flow plate (89) and is installed to be variable in position.

Fig. 10 is a plan view of the co-location variable apparatus of the present invention, Fig. 11 is a side view of the co-location variable apparatus of the present invention, and Fig. 12 is an operating state side view of the co-

One end of a variable shaft 86 provided with a variable handle 87 is connected to a variable plate 84 at a variable fixed table 88 and the variable plate 84 is connected to a variable shaft 84 86 and the variable hinge 85 at regular intervals.

The idler roller 28 is connected to one portion of the power belt 22 by an idle spring 29 so as to adjust the tension and the rotary plate 89 is rotatably installed with a frame 14 and a hinge 89a. And the variable spring 84a is provided so as to pull the flow plate 89 toward the supply motor 31 side.

A position adjusting shaft 83 is connected to the variable hinge 85 so as to pass through the flow plate 89 and be controlled by a fixed stopper 83a.

A position drive shaft 82 penetrates a flow plate 89 on the lower side of the position adjustment shaft 83 and a variable stopper 82 for variable control of the position of the flow plate 89 is provided in a portion of the position drive shaft 82 82a are connected.

FIG. 13 is a front view of the height adjusting apparatus of the present invention, and FIG. 14 is a plan view of the height adjusting apparatus of the present invention.

The height adjuster 50 is installed at a part of the frame 14 and a spring 52a is fitted to the handle shaft 52 to which the handle 51 is connected. A threaded portion 53 is formed at the tip of the handle shaft 52, And a position adjusting nut 54a is connected to the threaded portion 53 so as to adjust its position to the left and right together with the height adjuster 54 at a predetermined interval.

A height adjusting cam 55 is formed on the upper side of the right side of the height adjuster 54 so as to have a fan shape at the position moving pin 54b, .

The lower side of the cam drive shaft 57 is wrapped around the height adjustment cam 55 to adjust the height of the cam drive shaft 57. The cam drive shaft 57 penetrates the height adjustment guide 56a and is connected to the roller guide 58 , And a height adjustment roller (59) is connected to the roller guide (58).

The height adjusting guide 56a is installed on the height adjusting guide plate 56 provided on the frame 14 so as to adjust the height of the tennis ball 11. [

In the present invention constructed as described above, 300 or more tennis balls 11 are supplied to the ball storage tank 12, and the tennis balls 11 are driven one by one by driving the power motor 21 and the supplying motor 31, .

First, in the case of practicing general smashing, after the fixed wheel 25 and the moving wheel 27 are installed on the same line, the power of the feed motor 31 is rotated from the upper side to the belt 35a Thereby rotating the supply wheel 35.

The upright pin 38a and the supply guide pin 38 are rotated in one direction at the supply port 37 while the supply wheel 35 is rotated so that the supplied plurality of balls are moved to the supply port 37 The tennis ball 11 of FIG.

The guide pin 38 is formed to bend outward on the upper side and the upright pin 38a is installed upright in the vertical direction and aligns the tennis ball 11 while rotating to guide the guide pin 38 to be fed one by one.

One tennis ball 11 flowing into the supply port 37 is moved downward through the supply pipe 36. Since the ball stop plate 34 is not positioned in the stop guide groove 36a at first, And the tennis ball 11 moved to the lower side is caught by the supply regulating plate 33 and can not move down any more, so that the tennis ball 11 remains stationary at the tip of the supply tube 36. [

When the tennis ball 11 is kept stationary in the supply pipe 36, when the supply throttle 33 rotates and the discharge space 33a reaches the supply pipe 36 (Figs. 4 and 5) The tennis ball 11 is supplied to the stopper plate 33a at the same time as the stopper plate 34 is rotated and positioned in the stopper guide groove 36a The tennis ball 11 is kept stopped by stopping the further transportation and the lower tennis ball 11 is discharged downward through the discharge space 33a and supplied to the front guide bar 39. [

The tennis ball 11 is supplied between the fixed wheel 25 and the floating wheel 27 through the front guide bar 39 and the supply throttle plate 33 continues to rotate so that the discharge space 33a passes through the supply pipe 36, The ball stopper plate 34 passes the stop guide groove 36a so that the tennis ball 11 on the upper side of the ball stopper plate 34 moves downward and is hooked on the upper side of the supply control plate 33 to stop .

The driven wheel 27 is rotated by the rotation of the drive shaft 26 through the power belt 22 by the drive of the power motor 21 and is fixed by the rotation of the fixed shaft 24 via the pair of gears 23. [ The wheel 25 rotates.

Since the tennis ball 11 is supplied while the fixed shaft 24 and the moving shaft 26 rotate, the tennis ball 11 is supplied forward by the rotational force of the fixed shaft 24 and the moving shaft 26, Can perform smashing exercises through the tennis ball 11. [

The tennis ball 11 is supplied through the continuous operation as described above and the speed of the tennis ball 11 is controlled by controlling the rotational speed of the power motor 21 freely within the range of 0 to 130 km / It is possible.

The firing (supply) timing of the tennis ball 11 can be adjusted at intervals of 2, 3, 4, 5, and 6 seconds, respectively.

The height of the tennis ball 11 can be freely adjusted by using the tilt adjusting device 60 and the height adjusting device 50,

The inclination adjustment device 60 rotates the inclination adjustment handle 63 so that the inclination adjustment axis 62 is rotated and the inclination angle of the inclination adjustment bar 61 is adjusted so that the adjustment hinge 16 So that the inclination angle at which the tennis ball 11 is supplied can be adjusted by adjusting the overall inclination angle.

The height adjuster 50 moves the height adjuster 54 in accordance with the rotation of the handle shaft 52 when the handle 51 is rotated. The height adjustment cam 55 is rotated about the rotation center pin 55a and the height adjustment cam 55 is formed to have a different length so that the height adjustment cam 55 moves up the cam drive shaft 57 .

When the height adjusting cam 55 rotates clockwise and raises the cam drive shaft 57, the roller guide 58 is guided by the height adjusting guide 56a so that the position of the height adjusting roller 59 is raised The height adjusting roller 59 is lowered by lowering the cam driving shaft 57 while rotating the height adjusting cam 55 in the counterclockwise direction. The height of the hole 11 to be supplied through the height adjustment roller 59 is adjusted.

In other words, when the height is reduced, the tennis ball 11 can be supplied at various heights because it is supplied in a fastball and is suitable for smashing practice, and when it is the highest, it is supplied for volley practice.

The position of the tennis ball 11 can be variably supplied without being supplied in one direction through the ball position varying device 80,

Since the variable hinge 85 is connected to the front end of the variable plate 84 provided at the front end of the variable shaft 86 with the position drive shaft 82, the fixed stopper 83a pulls the flow plate 89 So that the fixed wheel 25 and the floating wheel 27 supply the tennis ball 11 from the same position to the front.

However, when the variable handle 87 of the coin position variable device 80 is rotated clockwise, the variable plate 84 connected to the variable shaft 86 rotates in the clockwise direction and the variable hinge 85 moves downward, The variable stopper 83a is moved to the left in the state that the position adjusting shaft 83 connected to the hinge 85 is connected to the flow plate 89 and the variable spring 84a pulls the flow plate 89 to the left And is moved to the left side through the hinge 89a.

At this time, the floating wheel 27 is moved upward in FIG. 9 because the floating shaft 26 is connected to the flow plate 89, thereby providing a state in which the floating wheel 25 is in a straight line with the fixed wheel 25.

The tennis ball 11 supplied through the front guide bar 39 is moved in the forward direction between the moving wheel 27 and the fixed wheel 25 To the right side.

The position drive shaft 82 advances through the rotation of the drive sprocket 81 and the variable stopper 82a is rotated by the rotation of the flow plate 89 The moving wheel 27 and the fixed wheel 25 move in a straight line and simultaneously the tennis ball 11 is supplied to the moving wheel 27. Thus, And the fixed wheel 25, the tennis ball 11 is supplied straight.

After the tennis ball 11 is fed straight, as the drive sprocket 81 rotates, the position drive shaft 82 moves backward and the variable stopper 82a moves away from the flow plate 89, The tennis ball 11 is rotated between the moving wheel 27 and the fixed wheel 25 whose position is changed when the hinge 89a is rotated by the elastic force of the tongue 84a to be stopped by being caught by the fixed stopper 83a, .

Therefore, when the ball position variable device 80 is used, the position of the floating wheel 27 is shifted left and right to be changed into two positions, and the tennis balls 11 are alternately supplied to different positions, When using the height adjuster (50), the bali can also be alternately moved to different positions, practicing bali, and practicing smashing or bali in two different positions. It is possible to expect a sufficient training effect.

Since the height of the tennis ball 11 can be freely adjusted, the tennis ball 11 can be freely adjusted, and the width thereof can be adjusted, the tennis ball 11 can be used variously without discriminating between a beginner and a senior, as well as a male, female,

Since the height, speed, and height of a tennis ball can be freely adjusted, it is possible to provide a very useful invention that can perform various training regardless of a novice or an advanced player.

10: Tennis Exerciser 11: Tennis Ball
12: ball storage tank 13: hopper
14: frame 15: wheel
16: Adjusting hinge 20: Power supply device
21: Power motor 22: Power belt
23: Gear 24: Fixed shaft
25: fixed wheel 26:
27: Floating Wheel 28: Idlera
29: idle spring 30: ball feeder
31: Supply motor 32: Supply shaft
33: Supply control plate 33a: Discharge space
34: Blank stop plate 35: Feed wheel
35a: belt 36: supply pipe
36a: stop guide groove 37: supply port
38: supply guide pin 38a: upright pin
39: Front guide 50: Height adjuster
51: handle 52: handle shaft
53: screw portion 54: height adjuster
54a: Positioning nut 54b: Positioning pin
55: height adjustment cam 55a: rotation center pin
56: height adjusting guide plate 56a: height adjusting guide
57: cam drive shaft 58: roller guide
59: height adjustment roller 60: tilt adjustment device
61: inclination adjustment bar 62: inclination adjustment axis
63: inclination adjustment handle 70: wire wheel
80: coin changer 81: drive sprocket
81a: Chain 82: Position drive shaft
82a: Adjustable stopper 83: Position adjusting axis
83a: Fixed stopper 84: Variable plate
84a: Variable spring 85: Variable hinge
86: variable axis 87: variable handle
88: variable table 89:
89a: HINGE

Claims (9)

A tennis training machine in which a hopper (13) feeds a tennis ball (11) to a ball storage tank (12) formed below and discharges it to the lower side and feeds it forward,
A supply wheel 35 for discharging the tennis balls 11 one by one from the lower side of the hopper 13 to the supply port 37 is connected to the supply shaft 32 of the supply motor 31 by a belt 35a, A supply tube 36 for forming a stop guide groove 36a is formed on the lower side of the supply wheel 35 and a stopper plate 34 located in the stop guide groove 36a and a supply tube 36 A supply device (30) provided with a supply throttle (33);
A fixed wheel 25 which is installed below the ball supply device 30 and connected to a fixed shaft 24 which is rotated by a power motor 21 and a gear 23 is formed, A power supply device (20) for supplying a tennis ball (11) by installing a floating wheel (27) connected to a moving shaft (26) connected by a belt (22);
A position adjusting shaft 83 connected to the flow plate 89 provided with the moving shaft 26 is connected to the variable plate 84 by a variable hinge 85, (80) connecting a variable axis (86) to the ball (80).
The method according to claim 1,
The supply throttle plate 33 is connected to the supply shaft 32 and has a discharge space 33a formed at one portion thereof and the air release plate 34 is disposed above the discharge space 33a in the stop guide groove 36a And the tennis balls (11) are provided one by one so that the ball can be supplied in various speeds, heights and directions.
The method according to claim 1,
The supply wheel 35 is provided such that the tennis balls 11 are supplied one by one by providing the supply guide pin 38 and the upright pin 38a which are bent upward outward from the supply port 37, Tennis Exercise Machines that can supply balls in various speed, height and direction.
The method according to claim 1,
The cooperating variable device 80 is connected to the frame 14 by a hinge 89a and after the movable shaft 26 is attached to the flow plate 89 connected to the variable spring 84, The position drive shaft 82 having the variable stopper 82a is connected to the drive sprocket 81 and the position adjustment shaft 83 passing through the flow plate 89 and provided with the fixed stopper 83a And a variable shaft 86 is connected to the variable fixing table 88 to which the variable hinge 85 is coupled so that the fixed state and the variable state of the floating wheel 27 can be selected It features tennis exercisers that can supply balls in various speeds, heights and directions.
5. The method of claim 4,
The frame 14 is connected to the upper side by the adjusting hinge 16 in one direction and connected to the upper side in the opposite direction. The inclination adjusting shaft 62, to which the inclination adjusting handle 63 is connected, 14. The tennis practice according to claim 1, further comprising a tilt adjusting device (60) for adjusting the tilt angle of the tennis racket (14).
The method according to claim 1,
Characterized in that the supply pipe (36) is rotatably connected to the supply wheel (35) on the upper side, and a stop guide groove (36a) is formed in a part of the supply pipe (36) Tennis Exerciser with ball supply.
The method according to claim 1,
Wherein the supply control plate (33) and the ball stop plate (34) are installed to have a height of one tennis ball (11).
The method according to claim 1,
The fixed wheel (25) and the floating wheel (27) are further provided with a height adjusting device (50) in front thereof;
The height adjusting device 50 includes a screw shaft 53 formed on a handle shaft 52 connected to the handle 51 to connect the height adjuster 54 with the position adjusting nut 54a, The height adjusting cam 55 connected to the height adjusting cam 55 by the position moving pin 54b is connected to the height adjusting cam 55 by the rotation center pin 55a and the cam driving shaft 57, And a height adjustment roller (59) is installed in the roller guide (58) through the guide roller (56a) to control the supply height of the tennis ball (11). Tennis Exerciser.
9. The method of claim 8,
The height adjusting cam 55 is formed in a shape of a sector in the position shifting pin 54b and a height adjusting cam 55 which moves the distance increasing toward the left as compared with the right side rotates around the center pin 55a, And the height of the drive shaft (57) is adjusted.

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