Patent Publication Number: US-2017348582-A1

Title: Ball game-related training system

Description:
BACKGROUND 
     Technical Field 
     The present invention relates to a ball game-related training system. More specifically, the present invention relates to a ball game-related training system to supply or shoot the ball to allow the player to practice a variety of ball games practices, including kicking or shooting the ball on the play field, hitting the ball falling onto the play field by a hand for a spike type attack, and receiving and shooting the ball over the air by a hand. 
     Related Art 
     In general, a variety of ball game practice aids are used to improve athlete&#39;s attack and defense skill in ball games, such as soccer, volleyball, and basketball. Using these exercise aids can reduce the fatigue of leaders, that is, coaches. Further, athletes can learn a variety of skills quickly and easily. As an example of football, such practice aids allow players to practice volley shoots, ground shoots, and heading shoots. As examples of such ball game practice aids, Japanese Patent Application Laid-Open No. H9-276463 (published on Oct. 28, 1997) tilted as “Ball shooting apparatus” (hereinafter referred to as Patent Document 1) and U.S. Pat. No. 8,371,964 B2 (issued on Feb. 12, 2013) tilted as “Volleyball spiking training device” (hereinafter referred to as “Patent Document 2”) are disclosed. 
     In the ball shooting apparatus disclosed in Patent Document 1, a ball is inserted between two pitching rollers rotated by two motors, and the ball is fired by the rotational force of the pitching rollers. Therefore, there is a problem that the shooting angle is not constant when using repeatedly the apparatus. Further, there is an inconvenience that many balls fired must be manually collected and put in a ball container. In addition, the ball shooting apparatus described in Patent Document 1 is not suitable for practicing various ball games since the ball is shot in a straight line at a relatively high position from the apparatus. 
     The foot volleyball is a ball game that originated from Korea. In this game, a net is set up between the two teams&#39; courts, and the team uses their head and feet to pass the ball to the opponent&#39;s team. In the conventional ball shooting apparatus disclosed in the patent document 1, the ball is inserted between the two pitching rollers, and the ball is fired forward by the pitching rollers. Therefore, there is a problem that the ball hits the net directly. Moreover, this apparatus is very expensive and is not suitable for general sports activities. This problem applies equally to a volleyball game having the similar game rules to the foot volleyball. For example, in the ball shooting apparatus disclosed in Patent Document 1, only the horizontal direction in which the ball is blown and the angle of inclination of the shot ball may be adjusted. Therefore, this shooting apparatus is not suitable for basketballs where that the players grab and toss the aerial ball falling vertically from above the play field  10  the floor, volleyballs where the players hit the aerial ball falling vertically from above the play field  10  the floor using the hand, and the foot volleyballs where the players hit the aerial ball falling vertically from above the play field  10  the floor using a foot. 
     The volleyball spike training system as disclosed in the patent document 2 comprises a ball holder and an optional net. The training holder comprises a wheeled chassis supporting a vertical stanchion projecting upwardly that supports a hopper and a ball feeding apparatus. The stanchion includes a crank system for vertically adjusting telescoped stanchion segments. Balls dropping from the hopper travel by gravity down an inclined ramp at the top of the frame towards a discharge throat. Balls travelling down the ramp are indexed by a Z-shaped lever that serially separates them. A pair of downwardly projecting hands, one fixed and one pivoted, receive dropping balls and temporarily hold them for shooting. The pivoting hand controls the indexing lever to jam successive balls when the device is loaded. When a ball is shot and removed from between the feed hands, another ball is freed by the indexing lever to automatically drop into a shooting position between the hands. However, in the ball supply apparatus disclosed in Patent Document 2, since the training ball supplied from the ramp is held at the end portion of the discharge throat, the player may only spike-attack the stopped ball. The user may not practice throwing or catching the flying balls. In other words, the practitioners may not do various basketball-related practices, nor may they kick or shoot a ball that is flying in the air. Further, in the case of volleyball, the user may not practice toss action. 
     Prior art patent document 1: Japanese Patent Application Laid-Open No. H9-276463 (published on Oct. 28, 1997) tilted as “Ball shooting apparatus” 
     Prior art patent document 2:U.S. Pat. No. 8,371,964 B2 (issued on Feb. 12, 2013) tilted as “Volleyball spiking training device” 
     SUMMARY 
     The present disclosure has been made in order to solve the above problems. The present disclosure is aimed to providing a ball shooting apparatus that automatically fires the training ball toward a pre-standardized play field for various ball games such as soccer, futsal, foot volleyball, volleyball, basketball, etc., and a ball collection apparatus which automatically collects the training ball fired into the play field and automatically supplies the collected training ball to the ball shooting apparatus, so that the ball game may be practiced more easily with minimum cost and time. 
     Another object of the present invention is to provide a ball game-related training system configured to detect the movement of a player on the play field and fire a ball towards a position associated with the sensed movement to allow the player to practice the ball receive operation, or to dropping the ball from above the play field onto a bottom to allow the player to practice the ball spike attack. 
     Still another object of the present invention is to provide a ball game-related training system including a ball shooting apparatus capable of shooting the training ball in various directions using a hydraulic actuator cylinder, and a ball collection device that automatically collects the ball launched into the play field at the corner or at the middle region of the end line or at the end line on the play field and automatically supplies the ball to the ball shooting apparatus. 
     Still another object of the present invention is to provide a ball game-related training system including a ball supply apparatus that falls down the ball downward from above the play field onto the bottom, to allow the player to hit the ball by a hand or foot or handing it over the net to the opposing court. 
     Still another object of the present invention is to provide a ball game-related training system including a ball shooting apparatus for detecting a player&#39;s movement on the play field and firing the ball at regular intervals in the motion detection direction, or for launching a ball based on detection of a player&#39;s predetermined movement type. 
     Still another object of the present invention is to provide a ball game-related training system including a ball shooting apparatus to shoot the ball by striking the ball that is seated in the distal end of an elongate hollow shooting tube via the action of a hydraulic actuator cylinder operated at high pressure by a hydraulic accumulator. 
     Still another object of the present invention is to provide a ball game-related training system including a score counter to assign and display a scored based on a ball passing-through sub-region in a rectangular region defined by the rectangular goalpost installed on the football play field or the futsal play field, thereby maximizing the exercise effect and inducing exercise interest. 
     Still another object of the present invention is to provide a ball game-related training system to fire a ball toward the player on the play field so that the player may smoothly practice the receive operation of the fired ball. 
     As used herein, the play field or court may refer to a soccer field, a basketball court, a volleyball court, and a foot volleyball court. 
     In one aspect of the present disclosure, there is provided a ball game-related training system comprising: a play court defined by a half line, both opposing end lines, and both opposing side lines, wherein the play court has a net extending along the half line; a vertical column structure adjacent to at least one of the end and side lines; and a ball supply apparatus coupled to the column structure at an upper portion thereof, wherein the ball supply apparatus includes: a housing coupled to the upper portion of the column structure, wherein a top portion of housing is partially opened, wherein the housing is divided by a partition into a ball storage portion and a ball discharge portion, wherein a bottom face of the ball storage portion is inclined downward toward the ball discharge portion, wherein a first opening is formed in a bottom of the ball discharge portion, and a second opening is formed in the partition at a lower portion thereof; a rotatable opening/closing plate rotatably coupled to the partition, wherein the rotatable opening/closing plate is configured to rotate to open/close the second opening; and a ball discharge tube rotatably coupled to the ball discharge portion at the first opening, wherein the ball discharge tube ball-communicates with the ball discharge portion via the first opening. 
     In one aspect of the present disclosure, there is provided a ball game-related training system comprising: a play field defined by a half line, both opposing end lines, and both opposing side lines; and a ball shooting apparatus configured to shoot a ball toward a target position on the play field, wherein the ball shooting apparatus includes: 
     a body frame having an internal space of a predetermined size defined therein, wherein a front side thereof is opened; a training ball shooter configured to shoot a ball, wherein the shooter is disposed in the inner space; and a ball container having an outer wall of a predetermined size for accommodating balls, wherein the container is coupled to a top end of the body frame, wherein a ball inlet of a predetermined size is formed in a top portion of the body frame so that the ball is introduced from the ball container into the ball shooter, wherein a bottom portion of the container is formed to have a downward inclined face at a predetermined angle toward the ball inlet so that the ball is introduced into the ball shooter; wherein the training ball shooter includes: an elongate hollow shooting tube having a ball receiving hole defined in a side wall thereof to receive a ball from the ball container; an orientation-variable support coupled to and supporting the elongate hollow shooting tube thereon; a rotatable support bracket coupled to and supporting the orientation-variable support thereon, wherein both side faces of the orientation-variable support are pivotally coupled to both side flanges of the rotatable support bracket respectively, wherein the rotatable support bracket is configured to pivotally move up or down to allow the orientation-variable support and the elongate hollow shooting tube coupled thereto to pivotally move up or down; a rotatable plate coupled to the rotatable support bracket, wherein the rotatable plate rotates in a clockwise or counterclockwise direction to enable the rotatable support bracket, the orientation-variable support coupled thereto, and the elongate hollow shooting tube coupled thereto to rotate in a clockwise or counterclockwise direction; a hydraulic pressure circuit including an actuator cylinder, wherein the cylinder is coupled to a proximal end of the elongate hollow shooting tube, wherein a movable piston of the actuator cylinder is insertable into and withdrawn from the elongate hollow shooting tube, wherein a striking plate is coupled to a distal end of the movable piston, wherein the actuator cylinder is embodied as a hydraulic actuator cylinder, wherein when the cylinder is activated, the striking plate is inserted into the shooting tube and strikes the ball received in the tube to fire the ball, wherein the cylinder has a hydraulic pressure inlet and a hydraulic pressure outlet defined therein; and a controller configured to control the hydraulic pressure circuit, and the pivotal movement and rotation movement of the shooting tube, wherein the hydraulic pressure circuit further includes: a hydraulic pressure accumulator connected to the hydraulic pressure inlet via a hydraulic pressure discharge solenoid valve, wherein a nitrogen tube filled with nitrogen is disposed inside the hydraulic pressure accumulator; a hydraulic pressure tank connected to the hydraulic pressure outlet via a hydraulic pressure recovery solenoid valve; a hydraulic pressure pump interposed between the hydraulic pressure tank and the hydraulic pressure accumulator, wherein a hydraulic pressure supply solenoid valve is disposed between the hydraulic pressure pump and the hydraulic pressure accumulator; and a pressure gauge for checking a nitrogen pressure in the nitrogen tube, wherein the controller is further configured to control the hydraulic pressure circuit based on a predetermined shooting mode and/or a predetermined shooting period. 
     In one embodiment, the play field is configured to be downwardly inclined from the half line to each end line, wherein the play field has a ball guide groove line defined therein along each end line, wherein the ball guide groove line is configured to be downwardly inclined from one end to the other end thereof, wherein the ball shooting apparatus is disposed on a corner region on the play field. 
     In one embodiment, the play field has a rectangular goalpost standing upright thereon, wherein the system further includes a ball sensing gate comprising: a rectangular body frame coupled to the goalpost; a first light emitting elements array arranged on one of left and right vertical portions of the body frame and a first light receiving elements array arranged on the other of left and right vertical portions of the body frame, wherein the first light emitting elements correspond to the first light receiving elements in terms of the number and positions thereof respectively; and a second light emitting elements array arranged on one of lower and upper horizontal portions of the body frame and a second light receiving elements array arranged on the other of the lower and upper horizontal portions of the body frame, wherein the second light emitting elements correspond to the second light receiving elements in terms of the number and positions thereof respectively, wherein the system further comprises a speed gun disposed behind the goalpost, and an impact sensor disposed on the goalpost or the rectangular body frame, wherein the system further comprises a score controller configured: to turn on the first and second light emitting elements arrays; to receive optical signals corresponding to light emissions received by the first and second light emitting elements arrays; to determine a specific sub-region in an planar region defined by the horizontal and vertical portions of the frame, based on the received optical signals, wherein the specific sub-region indicate a sub-region through which the ball passes through in an event that a player shoots the ball toward the goalpost; and to calculate a total score for the shoot event based on the determined specific sub-region, and/or a ball speed detected by the speed gun and/or an impact level detected by the impact sensor, wherein the system further comprises a display configured to display the total score. 
     In one aspect of the present disclosure, there is provided a ball game-related training system comprising: a play field defined by a half line, both opposing end lines, and both opposing side lines, wherein the play field is configured to be downwardly inclined from the half line to each end line, wherein the play field has a ball guide groove line defined therein along each end line, wherein the ball guide groove line is configured to be downwardly inclined from one end to the other end thereof, a ball shooting apparatus configured to shoot a ball toward a target position on the play field, wherein the ball shooting apparatus is disposed on a corner of the play field, wherein the ball shooting apparatus has a ball container receiving a ball from above; a ball supply apparatus disposed at a higher position of a net disposed on the half line of the play field, wherein the ball supply apparatus has an upper ball receiving opening to receive a ball from above, and the ball supply apparatus has a lower rotatable ball discharge tube, and the ball supply apparatus is configured to fall down the received ball on the play field via the ball discharge tube based on a ball discharge command signal; a ball convey tube line having one end vertically overlapping the upper ball receiving opening of the ball supply apparatus, wherein the ball convey tube line is downwardly inclined from the other end to one end thereof; and a ball collection apparatus disposed on the other end of the ball guide groove line, wherein the ball collection apparatus includes a vertical hollow ball guide elongate cylinder, and the ball is collected from the groove line and moves upwardly in and along the vertical hollow ball guide elongate cylinder using a collection motor, and the ball collection apparatus has an upper rotatable ball discharge tube, and the upper rotatable ball discharge tube is rotated such that a discharge hole thereof selectively overlaps vertically and above the ball container, the upper ball receiving opening, and/or the other end of the ball convey tube. 
     In one aspect of the present disclosure, there is provided a ball game-related training system comprising: a play field defined by a half line, both opposing end lines, and both opposing side lines, wherein the play field is configured to be downwardly inclined from the half line to each end line, wherein the play field has a ball guide groove line defined therein along each end line, wherein the ball guide groove line is configured to be downwardly inclined from one end to the other end thereof; a ball shooting apparatus configured to shoot a ball toward a target position on the play field, wherein the ball shooting apparatus is disposed on a corner of the play field, wherein the ball shooting apparatus has a ball container receiving a ball from above; a ball collection apparatus disposed on the other end of the ball guide groove line, wherein the ball collection apparatus includes a vertical hollow ball guide elongate cylinder, and the ball is collected from the groove line and moves upwardly in and along the vertical hollow ball guide elongate cylinder using a collection motor, and the ball collection apparatus has an upper rotatable ball discharge tube, and the upper rotatable ball discharge tube is rotated such that a discharge hole thereof selectively overlaps vertically and above the ball container, and/or an upper ball receiving opening of a ball supply apparatus; a guide rail extending along and spaced from the side line on the play field; a vertical post having at least one wheel on a bottom thereof so as to move along and on the guide rail, wherein the vertical post has a height higher than a height of a net disposed along the half line on the play field; and the ball supply apparatus coupled to a top portion of the vertical post, and configured to drop a ball onto the play field, wherein the ball supply apparatus has an upper ball receiving opening to receive a ball from above, wherein when the ball supply apparatus moves toward the ball collection apparatus together with the movement of the post coupled thereto, the ball supply apparatus receives the ball from the upper rotatable ball discharge tube of the ball collection apparatus via the ball receiving opening thereof, and the ball supply apparatus has a lower rotatable ball discharge tube, and the ball supply apparatus is configured to fall down the received ball on the play field via the ball discharge tube based on a ball discharge command signal. 
     In one aspect of the present disclosure, there is provided a ball game-related training system comprising: a play field defined by a half line, both opposing end lines, and both opposing side lines, wherein the play field is configured to be downwardly inclined from the half line to each end line and each side line, wherein the play field has a ball guide groove line defined therein along each end line, wherein the ball guide groove line is configured to be downwardly inclined from one end and the other end to a middle portion thereof; a basketball goalpost disposed behind the middle portion of the end line; a ball shooting apparatus configured to shoot a ball toward a target position on the play field, wherein the ball shooting apparatus is disposed behind the goalpost, wherein the ball shooting apparatus has a ball container receiving a ball from above; a ball collection apparatus disposed on the middle portion of the ball guide groove line, wherein the ball collection apparatus includes a vertical hollow ball guide elongate cylinder, and the ball is collected from the groove line and moves upwardly in and along the vertical hollow ball guide elongate cylinder using a collection motor, and the ball collection apparatus has an upper rotatable ball discharge tube, and the upper rotatable ball discharge tube is rotated such that a discharge hole thereof selectively overlaps vertically and above the ball container, and/or an upper ball receiving opening of a ball supply apparatus; and a ball supply apparatus configured to drop a ball onto the play field, wherein the ball supply apparatus has an upper ball receiving opening to receive a ball from above, and the ball supply apparatus has a lower rotatable ball discharge tube. 
     In one embodiment, a diameter of a distal end of the hollow shooting tube is smaller than a diameter of the training ball so that the training ball is seated at the distal end of the hollow tube. 
     In one embodiment, the system further includes the ball collection apparatus disposed on the other end of the ball guide groove line, wherein the ball collection apparatus includes a vertical hollow ball guide elongate cylinder, and the ball is collected from the groove line and moves upwardly in and along the vertical hollow ball guide elongate cylinder using a collection motor, and the ball collection apparatus has an upper rotatable ball discharge tube, and the upper rotatable ball discharge tube is rotated such that a discharge hole thereof selectively overlaps vertically and above the ball container of the ball shooting apparatus. 
     In one embodiment, the ball collection apparatus comprises: a vertical cylindrical hollow tube having a bottom ball inlet hole and a top ball discharge hole and disposed on the other end of the ball guide groove line; a vertical shaft concentrically received in the cylindrical hollow tube, where the shaft is spaced from an inner face of the hollow tube; a vertically helically extending blade extending along and on an outer face of the vertical shaft; and a collection motor configured to allow rotation of the vertical shaft, when the collection motor is activated, the ball collected into the groove line is guided upwards along the vertically helically extending blade and is discharged out of the discharge hole. 
     In one embodiment, he system further include an elongate vibration plate embedded in the ball guide groove line, wherein the vibration plate is vibrated in the longitudinal direction of the groove line by a rotation of a vibration motor such that the ball collected in the groove line moves toward the bottom ball inlet hole defined in the ball collection apparatus, wherein the elongate vibration plate is downwardly inclined toward the bottom ball inlet hole. 
     In one embodiment, the hydraulic pressure circuit further includes: nitrogen tank connected to the hydraulic pressure inlet via the hydraulic pressure discharge solenoid valve, wherein a nitrogen tube filled with nitrogen is disposed inside the nitrogen tank; the hydraulic pressure tank connected to the hydraulic pressure outlet via the hydraulic pressure recovery solenoid valve; the hydraulic pressure pump interposed between the hydraulic pressure tank and the nitrogen tank, wherein the hydraulic pressure supply solenoid valve is disposed between the hydraulic pressure pump and the nitrogen tank; and the pressure gauge for checking a nitrogen pressure in the nitrogen tube, wherein the controller is further configured to control the hydraulic pressure circuit based on the predetermined shooting mode and/or the predetermined shooting period. 
     In one embodiment, the system further comprises cameras for photographing the play field, wherein the cameras are installed on different sides of the body frame, wherein the controller is configured to receive image information from the cameras and to determine whether the image information contains a predetermined movement of the player on the play field, and to activate the actuator cylinder upon determination that the image information contains the predetermined movement of the player. 
     Advantageous Effects 
     According to the present invention, in the ball game-related training system, the training ball shooting apparatus that fires a ball by hydraulic actuator cylinder operation is installed at a corner of a soccer field or behind a goalpost of a basketball court. This allows the user to practice penalty kicks, volley kicks, and heading shots. In addition, the training ball may be fired in a set mode by the user to allow the player to kick or hit the fired ball with the kick or the hand. In this way, the player may practice various ball game related exercises. The apparatus also flies the training ball horizontally over the play field or drop the training ball from the vertical direction to the play field floor. This allows the player to practice the spikes and tossing exercises. Then, the training ball, which has fallen to the bottom of the play field, may be automatically collected at the goal line or the end line and is supplied to the training ball shooting apparatus to operate an unmanned ball game practice system. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic configuration diagram of a training ball shooting apparatus according to an embodiment of the present invention. 
         FIG. 2  is a front cross-sectional view of a training ball shooting apparatus according to an embodiment of the present invention. 
         FIG. 3  is a side cross-sectional view of a training ball shooting apparatus according to an embodiment of the present invention. 
         FIG. 4  is an exploded perspective view showing an internal construction of a training ball shooting apparatus according to an embodiment of the present invention. 
         FIG. 5  is a cross-sectional view of a hollow shooting tube for firing a training ball in accordance with an embodiment of the present invention; 
         FIG. 6  is a control block diagram for a training ball shooter according to an embodiment of the present invention. 
         FIG. 7  is a flowchart of an operation of a training ball shooting apparatus according to an embodiment of the present invention. 
         FIG. 8  is a flowchart of an operation of a training ball shooting apparatus according to another embodiment of the present invention. 
         FIG. 9  is a specific configuration diagram of a ball collection apparatus according to an embodiment of the present invention. 
         FIG. 10  is a side cross-sectional view of a ball supply apparatus according to an embodiment of the present invention. 
         FIG. 11  is a schematic configuration view of a soccer-related training system according to an embodiment of the present invention. 
         FIG. 12  is a cross-sectional view of a play field shown in  FIG. 11 . 
         FIG. 13  is an enlarged view of a ball shooting apparatus and a ball collection apparatus shown in  FIG. 11 . 
         FIG. 14  is a schematic view of a ball sensing gate for determining a score for a ball pass-through sub-region in a rectangular planer region defined by a goalpost according to an embodiment of the present invention. 
         FIG. 15  is a circuit diagram of a score counter according to an embodiment of the present invention. 
         FIG. 16  is a schematic configuration diagram of a foot volleyball-related training system according to an embodiment of the present invention; 
         FIG. 17  is a schematic configuration diagram of a volleyball-related training system according to an embodiment of the present invention. 
         FIG. 18  is a schematic configuration diagram of a basketball-related training system according to an embodiment of the present invention. 
         FIG. 19  is a cross-sectional view showing a configuration of a ball guide groove line formed behind an end line of a basketball court as shown in  FIG. 18 . 
     
    
    
     DETAILED DESCRIPTIONS 
     Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. It should be understood, however, that the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be noted that the embodiments of the present invention described below are intended to sufficiently convey the spirit of the present invention to those skilled in the art. In addition, the present invention is used to practice soccer, volleyball, and basketball games and a foot volleyball game which is a Korean ball game. The names of the lines drawn on the soccer field, volleyball court, basketball court, and foot volleyball court differ from each other. However, the half line on the soccer field, and center lines on the volleyball court, basketball court, and foot volleyball court all are drawn at a center thereof to bisect them. Therefore, as used herein, the line drawn at the center thereof will be referred to as a half line irrespective of the type of the ball games. 
     Referring to  FIG. 1  to  FIG. 5 , a ball shooting apparatus  100  according to the present invention will be described. Referring to  FIG. 1  to  FIG. 4 , the ball shooting apparatus  100  includes a body frame  102  having an internal space of a predetermined size defined therein. One side of the body frame  102 , preferably the front side thereof, is opened. Further, a training ball shooter  105  for launching a training ball is disposed in the inner space. In this connection, a plurality of components are built in the body frame  100  to rotate the training ball shooter  105  left and right, up and down, and operate the training ball shooter  105 . These components have a functionally close connection, and these components and their operations will be described later. As used herein, the training ball may refer to a conventional soccer ball, basketball ball, foot volleyball game ball, or volley ball. In addition, a first camera CAM 1  and a second camera CAM 2  are installed on a front and side surfaces of the body frame  102  of the training ball shooting apparatus  100  respectively. The cameras CAM 1  and CAM 2  may capture subjects around the body frame  102  and acquire corresponding image information. 
     Although not shown in the drawings, the lower end of the body frame  102  of the training ball shooting apparatus  100  may be provided with wheels for moving the apparatus  100 . In this case, in order to fix the body frame  102 , it is possible to additionally provide fixing means of a known type preventing rotation of the wheels at either the front or the rear portion of the body frame. Further, it is preferable that the front wheels have a known structure such that the wheels can be changed in a direction thereof freely when the body frame  102  is moved. 
     The ball container  104  having an outer wall of a predetermined size for accommodating the training balls is coupled to the top end of the body frame  102 . The ball container  104  is manufactured in the shape of a rectangular barrel having open top and bottom. In order to allow the amount of the training balls loaded therein to be visible, the container  104  may be configured as a mesh structure. 
     A ball inlet  107  of a predetermined size is formed in the upper portion of the body frame  102  so that the training ball supplied from the ball container  104  can be introduced into the ball shooter  105  in the body frame  102 . The upper portion of the body frame  102  is formed to have a downward inclined surface at a predetermined angle toward the ball inlet  107  so that the training ball can be easily introduced into the ball shooter  105 . In this connection, the body frame  102  and the ball container  104  may be combined in various ways. For example, they may be joined together by welding. Alternatively, fitting grooves may be formed in the edge of the upper portion of the body frame  102 , and corresponding fitting protrusions may be formed on the bottom edge of the ball container  104 , and the fitting protrusions may be fitted into the fitting grooves. 
     Although not shown in the drawings, an operation switch of the shooter, a display device for displaying the operation of the ball shooter, and operation key buttons for setting an operation mode of the shooter may be provided outside the body frame  102 . In one embodiment, such a display device, and operation key buttons may be implemented with a touch screen. 
     The training ball shooter  105  installed in the inner space of the body frame  102  receives the training ball from the ball container  104  coupled to the upper portion of the body frame too and may be configured to shoot the training ball. A connection flexible tube  116  of a predetermined diameter extending from the bottom of the ball inlet  107  formed at the lower end of the downwardly inclined faces  103  of the body frame  100  is connected to the shooter  104  for introduction of the training ball into the shooter  104 . The connection flexible tube  116  is connected to a ball receiving hole  115  opened at a front of a elongate hollow shooting tube  114  shown in  FIG. 4 , wherein the tube  114  constitutes a part of the training ball shooter  105 . 
     The training ball introduced into the ball receiving hole  115  of the elongate hollow shooting tube  114  is seated at a shooting point as shown in  FIG. 5 . In this connection, at a distal end of the elongate hollow shooting tube  114 , there is formed an inwardly rounded protrusion  114   a . Thus, due to the protrusion, the training ball introduced into the ball receiving hole  115  is prevented from flowing out of the elongate hollow shooting tube  114  in the absence of a strike. In addition, at the distal end of the elongate hollow shooting tube  114 , a sensor is installed to discriminate the presence or absence of the training ball therein. The sensor may transmit the sensed information to a controller MPU as shown in  FIG. 6 . As such a sensor, a photo sensor or the like may be used. 
     The elongate hollow shooting tube  114  is coupled to and supported on and by an orientation-variable support  112 . The orientation-variable support  114  is supported by its rotatable support bracket  110 . Both side faces of the orientation-variable support  114  are pivotally coupled to both side flanges of the rotatable support bracket  110  respectively. More specifically, on one side face of the orientation-variable support  112 , a rack gear  118  is integrally formed therewith. The rack gear  118  is intermeshed with a drive gear  119  integrally formed on an inner face of one side flange of the rotatable support bracket  110 . A tilt-changing motor  117  connected to the drive gear  119  allows the orientation-variable support  114  and, hence, the elongate hollow shooting tube  114  to pivot up and down. In addition, a direction-changing motor  120  is provided below the rotatable support bracket  110 . A rotatable plate  128  is coupled to a distal end of a rotating shaft from the direction-changing motor  120 . The rotatable support bracket  110  is screw-coupled to the rotatable plate  128 . Accordingly, the orientation-variable support  112  and thus, the elongate hollow shooting tube  114  can be rotated in the clockwise or counterclockwise direction by driving the direction-changing motor  120 . 
     In this manner, according to the present invention, the training ball shooter  105  of the training ball shooting apparatus  100  is rotated in a clockwise or counterclockwise direction via the rotation of the rotatable support bracket  110  and pivotally moves upward or downward via the upward or downward pivotal movement of the orientation-variable support  112 . Thus, the elongate hollow shooting tube  114  can be oriented freely in the left, right, up and down directions. This allows the training ball located in the elongate hollow shooting tube  114  to be fired freely in the left, right, up and down directions 
     The training ball introduced into the elongate hollow shooting tube  114  is fired by operation of an actuator cylinder  130  coupled to the proximal end of the elongate hollow shooting tube  114 . A movable piston  132  of the actuator cylinder  130  is insertable into and withdrawn from the interior of the elongate hollow shooting tube  112 , as shown in  FIG. 5 . A striking plate  134  is coupled to the distal end of the movable piston  132 . In this connection, the actuator cylinder  132  may use a hydraulic or pneumatic actuator cylinder. It is desirable to use a hydraulic actuator cylinder to fire the training ball farther away. 
     The hydraulic actuator cylinder  132  typically has a hydraulic inlet and a hydraulic outlet. The hydraulic inlet is connected to the outlet of a nitrogen tank  144  via a hydraulic pressure discharge solenoid valve  150 . The hydraulic outlet is connected to the hydraulic tank  140  through a hydraulic pressure recovery solenoid valve  146 . A hydraulic pump  142  is interposed between the hydraulic tank  140  and the nitrogen tank  144  and is connected thereto. In this connection, a hydraulic pressure supply solenoid valve  148  is connected between the hydraulic pump  142  and the nitrogen tank  144 . In this connection, a nitrogen tube filled with nitrogen is disposed inside the nitrogen tank  144 . There is provided a pressure gauge for checking the nitrogen pressure of the nitrogen tube. When the hydraulic pressure is supplied to the nitrogen tank  114  having such a configuration, a pressure is applied to the nitrogen tube in proportion to the supplied hydraulic pressure, so that the internal pressure of the nitrogen tube increases. This increase in the internal pressure is provided to the controller MPU. 
     The operation of the hydraulic circuit thus configured will be briefly described below. In order to insert the movable piston  132  of the actuator cylinder  30  into the elongate hollow shooting tube  114 , the controller drives the hydraulic pump  142  at an open state of the hydraulic pressure supply solenoid valve  148  so that the hydraulic pressure in the hydraulic tank  140  is supplied to the nitrogen tank  144 . By such continuous pumping, when the hydraulic pressure supplied into the nitrogen tank  144  increases, pressure is applied to the nitrogen tube installed therein, and this pressure increase level is provided to the controller. When the sensed pressure of the nitrogen tube has a predetermined pressure value, the operation of the hydraulic pump  142  is stopped, and at the same time, the hydraulic pressure supply solenoid valve  148  is closed. Therefore, the nitrogen tank  148  is filled with a high-pressure hydraulic nitrogen. 
     When the shooting command is input from the external touch screen to the controller, or when the preset shooting cycle from a software program is reached, the controller opens the hydraulic pressure discharge solenoid valve  150  only for a certain period of time. With this operation, when the hydraulic pressure discharge solenoid valve  1500  is opened, the hydraulic pressure filled in the nitrogen tank  144  at a high pressure is supplied to the hydraulic inlet of the actuator cylinder  130 . This causes the movable piston  130  in the actuator cylinder  130  to advance. By this action, the striking plate  134  attached to the distal end of the piston strikes the training ball placed at the distal end of the elongate hollow shooting tube  114 . As a result, the training ball is fired. 
     After opening the hydraulic pressure discharge solenoid valve  150  for the period of time, the controller opens the hydraulic pressure recovery solenoid valve  146  and the hydraulic pressure supply solenoid valves  148  and drives the hydraulic pump  142 . Thereby, the hydraulic pressure filled in the actuator cylinder  130  is recovered to the hydraulic tank  140 . As a result, the movable piston  132  enters back the actuator cylinder. 
     The controller may control the rotation of the direction-changing motor  120  and the tilt-changing motor  117  coupled to the rotatable support bracket  110 , as well as the drive of the hydraulic circuit described above. Thereby, the elongate hollow shooting tube  114  may be rotated in the clockwise or counterclockwise direction or may pivotally move in the upward or downward direction. 
       FIG. 6  is a block diagram of a controller to control the ball shooter according to an embodiment of the present invention. The controller may be provided in an inner space of the body frame  102  of the training ball shooting apparatus  100 . However, the present invention is not limited thereto. Referring to  FIG. 6 , the shooting controller is connected to the first and second cameras CAM 1  and CAM 2  installed on at least one side face of four side faces of the body frame  102 . This camera(s) images the play field  10  on which a player is located. The two cameras CAM 1  and CAM 2  are configured to photograph an area in front of the training ball shooting apparatus  100  and the half line on the play field respectively. In addition, the touch screen TS may be installed on one side of the four sides of the body frame  102 . As described above, the operation switch, the display device for displaying the operation of the shooter, and the key buttons for setting the operation mode of the shooter are provided on the touch screen. 
     A mode (manual mode, automatic mode, camera mode, direction setting mode, penalty kick mode, head shoot mode, volley shoot mode, etc.) selected by the user through the touch screen TS is supplied to the controller. Further, image signals photographed from the first and second cameras CAM 1  and CAM 2  are input to the controller MPU. The controller MPU controls all operations of the training ball shooting apparatus  100  based on those information. Mainly used modes are manual mode, auto mode, and camera mode. However, the present disclosure is not limited thereto. 
     In the case of the manual mode, the controller MPU receives a direction setting key selection (vertical or horizontal direction) from the touch screen and accordingly drives the direction-changing motor  120  and the tilt-changing motor  117 . In this way, the shooting direction of the training ball shooter  105  is set. The actuating cylinder  130  is actuated through a solenoid valve driving unit (SOD) via a fire command from the touch screen by the user to fire the training ball. In the case of the automatic mode, the controller MPU receives a direction setting key selection (vertical or horizontal direction) from the touch screen and accordingly drives the direction-changing motor  120  and the tilt-changing motor  117 . In this way, the shooting direction of the training ball shooter  105  is set. The actuating cylinder  130  is actuated through a solenoid valve driving unit (SOD) per a preset shooting initiation period (for example, every 15 seconds). In the case of the camera mode, the controller MPU controls the direction-changing motor  120  and the tilt-changing motor  117  such that the shooting tube  114  is oriented toward the direction of the player in the play field photographed by the first and second cameras CAM 1  and CAM 2 . Further, when the player starts move with a predetermined movement (for example, when the player lifts his arm up maximally), the actuating cylinder  130  is operated through the solenoid valve drive SOD 1 to 2 seconds after the start of the movement. Thus, the training ball is fired toward to the player. 
       FIG. 7  is a flowchart of the operation of the training ball shooting apparatus according to an embodiment of the present invention. This drawing is intended to explain the operations in the case of the manual mode and the automatic mode.  FIG. 8  is a flowchart of the operation of the training ball shooting apparatus according to another embodiment of the present invention. This figure is directed to a scenario where the firing direction is set based on the imaging information captured by the first and second cameras CAM 1  and CAM 2  installed on the side of the body frame  102  and the training ball is fired based on the movement of the player photographed by the first and second cameras CAM 1  and CAM 2 . 
     First, with reference to  FIG. 6  and  FIG. 7 , the operation of the training ball shooting apparatus  100  shown in  FIG. 1  to  FIG. 5  described above will be described. 
     The training ball shooting apparatus  100  includes the touch screen TS disposed on an outer surface of the body frame  102  as described above. This touch screen TS is connected to the controller MPU incorporated in the body frame  102 . When the user inputs data through the touch screen TS, the controller MPU controls the operation of the components provided in the body frame  102  based on the inputs. That is, the controller begins to control the operation of the tilt-changing motor  117  and the direction-changing motor  120 , the hydraulic pump  142 , and the various solenoid valves  146 ,  148 ,  150  disposed in the body frame  102  based on the inputs. 
     The training ball shooting apparatus  100  may be driven by the controller MPU in a manual mode and a motion detection mode. In the manual mode, the user uses the touch screen TS installed in the body frame  102  to select one of the exercise modes (penalty kick, corner kick set play, ground ball shoot, volley shoot, head shoot modes or any combination thereof), and a shooting period (for example, about 15 seconds), then press the shooting button to fire the training ball to the play field  10 . Alternatively, the user may select one of the exercise modes (penalty kick, corner kick set play, ground ball shoot, volley shoot, head shoot modes or any combination thereof), and press the shooting button. In this connection, the orientation of the elongate hollow shooting tube  114  may be adjusted via the tilt and/or direction-changing motors  117  and/or  120  based on the selected mode and, then, the training ball is fired continuously in a predetermined cycle. In this connection, although the example of the shooting button on the touch screen TC has been described, the present invention is not limited thereto. The shooting button may be provided on a remote controller carried by a player using a normal remote control device. 
     Manual/Automatic Mode for Training Ball Shooting Apparatus 
     When the training ball shooting apparatus  100  is operated, the controller MPU checks the pressure in the nitrogen tank  144  at S 1  operation to determine whether it is at a pressure capable of advancing the movable piston  132  of the actuator cylinder  130  at a predetermined speed. When the pressure of the nitrogen tube in the nitrogen tank  140  does not reach the preset pressure, the controller opens the hydraulic pressure recovery and supply solenoid valves  146  and  148  through the solenoid valve drive unit SOD in operation S 6 . Accordingly, the hydraulic pressure in the actuator cylinder  130  is recovered to the hydraulic tank  140  and then supplied to the nitrogen tank  144 . When the hydraulic pressure is continuously supplied to the nitrogen tank  144 , the pressure applied to the nitrogen tube installed therein is increased to reach the predetermined pressure. 
     When it is determined in S 2  operation that the pressure of the nitrogen tank is at the predetermined pressure, the controller MPU closes the hydraulic pressure recovery, supply and discharge solenoid valves  146 ,  148 ,  150 . Then, in S 4  operation, the controller determine whether the shooting button on the touch screen or remote control device is pressed. When it is determined in S 4  operation that the shooting button is pressed, the controller MPU opens the hydraulic pressure discharge solenoid valve  148  for a preset time T in S 5  operation. In this connection, the hydraulic pressure filled at the high pressure in the nitrogen tank  144  is supplied to the hydraulic inlet of the actuator cylinder  130  through the hydraulic pressure discharge solenoid valve  148  at a high speed due to the expansion of the compressed nitrogen tube. 
     Thus, the actuator cylinder  130  advances the movable piston  132 , which is located therein, by hydraulic pressure introduced at a very high pressure. Thus, the striking plate  134  coupled to the distal end of the movable piston  132  strikes the training ball placed at the distal end of the elongate hollow shooting tube  114  to fire the ball. In this connection, the firing angle of the ball from the training ball shooter  105  located in the interior space of the body frame  102  of the training ball shooting apparatus  100  is controlled by the controller controlling the tilt and direction changing motors  117  and  120 . 
     The controller MPU, upon having performed the S 5  operation, opens the hydraulic pressure recovery and supply solenoid valves  146  and  148  through the solenoid valve drive unit SOD in operation S 6  and then drives the hydraulic pump  142  in operation S 7 . In this way, the nitrogen tank  142  is filled with hydraulic pressure. 
     If the shooting button on the touch screen TS is not activated in the S 4  operation described above, the controller MPU adjusts the horizontal angle and vertical angle and the shooting period for the elongate hollow shooting tube  114  of the training ball shooter  105 . Thereafter, the aforementioned S 5  operation is performed. The mode set in the S 8  operation refers to the automatic firing mode and the camera mode. 
     When the mode set in operation S 8  is the automatic firing mode, the controller MPU drives the direction-changing motor  120  and the tilt-changing motor  117  based on a direction setting input (vertical direction or horizontal direction) from the touch screen to set the shooting direction of the training ball shooter  105 . Then, the controller activates the actuator cylinder  130  of the hydraulic circuit through the solenoid valve driving unit SOD based on every predetermined time period to fire the training ball. If it is determined that the mode set in operation S 8  is the camera mode, the controller MPU controls the operation of the training ball shooting apparatus  100  as shown in  FIG. 8 . When the mode set in the S 8  operation is a stop mode, the controller does not perform any operation. 
     Movement Sensing Mode 
     In the movement sensing mode, the shooting direction is set based on the information captured by the first and second cameras CAM 1  and CAM 2  installed on the sides of the body frame  102 , and then the training ball is fired based on the player&#39;s movement in front of and/or at both sides of or around the shooter as imaged by the first and second cameras CAM 1  and CAM 2 . 
     Referring to  FIG. 8 , the controller MPU determines whether the current mode is the camera operation mode in operation S 104 . If the determination result indicates that the current mode is not the camera operation mode, the process jumps to operation S 17  where the shooter fires the training ball according to the manual/automatic modes operation as described above. 
     When it is determined in the operation S 12  that the current mode is the camera operation mode, the controller MPU receives the image signals photographed by the first and second cameras CAM 1  and CMA 2  installed on the sides of the body frame  102  in operation  811 . In S 12  operation, the controller may detect the movement of the player in the front or side of the training ball shooting apparatus  100 . After detecting the movement of the player, the controller MPU determines the position of the detected player, and thereafter controls the tilt-changing motor  117  and the direction-changing motor  120  in operation S 13  based on the position to adjust the vertical angle and the horizontal angle, that is, the shooting angle of the training ball shooter  105 . 
     Then, in S 14  operation, the controller MPU analyzes the image signals transmitted from the first and second cameras CAM 1  and CAM 2  to determine the motion of the subject. In operation S 15 , the controller determines whether the movement of the player is of a preset movement type. For example, the player determines whether the player has lifted her/his arm up maximally. This determination can be easily made by comparing a one-second previous frame image and a current frame image. 
     When, in operation S 15 , it is determined that the player movement determined from the video signal received through the first and second cameras CAM 1  and CAM 2  is of the predetermined motion type, the controller MPU controls the solenoid valve driving unit SOD in operation  816  such that the striking plate  134  mounted at the distal end of the movable piston  132  of the actuator cylinder  130  strikes the training ball as previously described. Thereby, the training ball is fired towards the player. 
     The ball fired from the training ball shooter  105  of the training ball shooting apparatus  100  will be directed in a specific direction, that is, toward the player. The training ball fired toward the player will be hit by the body member (e.g., foot, hand, etc.) of the player and will fly or roll towards a touch line or goal line and eventually will fall on the court of the play field. 
     Although the driving unit for the training ball shooter  105  has been described by way of example using a hydraulic actuator cylinder in the above embodiment, the present disclosure is not limited thereto. It is apparent that a pneumatic actuator cylinder may be used as the driving unit by a person skilled in the art who understands the specification of the present invention. 
       FIG. 9  shows a specific configuration of a ball collection apparatus according to an embodiment of the present invention. The ball collection apparatus may be installed at one corner of the bottom of the play field  10 . In this connection, the play field mentioned above may refer to the soccer field, the basketball court, the volleyball court, and the foot volleyball court, etc. In order to allow the training ball that has fallen onto the play field  10  to be guided from the half line toward the goal line or the end line, the play field is inclined at an angle of θ2 from the half line toward the goal line or the end line thereof. The ball collection apparatus  200  shown in  FIG. 9  may be installed near a ball guide groove line  14  formed in the rear of the goal line or the end line of the play field  10 , as shown in  FIG. 9 . 
     The ball guide groove line  14  is formed such that one end of the ball guide groove line  14  is inclined downward to the other end or to an intermediate point thereof. Therefore, the training ball falling down on the play field downwardly inclining from the half line to the goal line or the end line is rolled from the half line HL in the direction of the goal line or end line and eventually to the ball guide groove line  14 . The training ball collected in the ball guide groove line  14  rolls in the direction of a bottom portion of a cylindrical collecting tube of the ball collection apparatus  200 . The training ball introduced into the lower end of the ball collection apparatus  200  flows into the lower end gate G of the ball collection apparatus  200 . 
     As shown in  FIG. 9 , when a collection motor  206  installed in a top of the ball collection apparatus  200  is rotated, a vertical rotation shaft  208  connected to the motor is rotated. In this connection, a vertically helically extending blade  210  having a vertical pitch (for example, 220 mm) larger by about 1 cm than a diameter of the training ball is formed on the outer circumferential surface of the rotation shaft  208 . In this connection, a distance r 1  between the rotation shaft  208  and an inner surface of an outer hollow cylindrical body of the ball collection apparatus  200  is 2 mm to 3 mm smaller than the diameter r 2  of the training ball. Accordingly, when the rotation shaft  208  is rotated, the training ball introduced into the lower gate G of the ball collection apparatus  200  is transferred to an upper portion thereof along a screw type conveyor  212  including the rotation shaft  208  and the vertically helically extending blade  210 . In this connection, the distance r 2  between the rotation shaft  208  and the inner surface of the outer hollow body of the ball collection apparatus  200  is smaller than the diameter r 1  of the training ball, and, thus, the training ball is slightly distorted therebetween. In this way, the upward movement of the ball is carried out reliably. 
     A vibration plate  214  is embedded in the ball guide groove line  14  in the front of the gate G of the ball collection apparatus  200 . The vibration plate is vibrated in the longitudinal direction of the line  14  by the rotation of a vibration motor  216 . The vibration motor  216  is rotated at the same time as the collection motor  206  in the ball collecting operation. This allows the training ball collected at the end or middle portion of the downwardly inclined ball guide groove line  14  to smoothly enter the gate G of the ball collection apparatus  200 . 
     The training ball transferred to the upper portion of the screw type conveyor  212  of the ball collection apparatus  200  is discharged to the ball discharge tube  202  by rotation of the vertically helically extending blade  210 . The training ball discharged out of the ball discharge tube  202  is inserted into an upper opening of the ball container  104  of the training ball shooting apparatus  100  installed adjacent to the ball collection apparatus  200 . 
     In this embodiment, the ball collection apparatus  200  includes the rotation shaft  208  installed inside the vertical cylindrical hollow tube  204  and the vertically helically extending blade  210  on the outer circumferential surface of the shaft  208 . Further, the collected balls are transported upward along the vertically helically extending blade  210  and the inner wall face of the vertical cylindrical hollow tube  204 . The present invention is not limited to this. The ball collection apparatus  200  may be realized by an equivalent screw conveying apparatus thereto. 
     In one embodiment, two vertical poles spaced apart from the rotation shaft  208  having the vertically helically extending blade  210  formed on its periphery are arranged. The two vertical poles may be vertically extended along the shaft  208  so as to be separated with spacing from the shaft  208  at a distance of about 1 mm to 2 mm less than the diameter r 2  of the training ball. In this embodiment, when the training ball is rolled into the gate of the ball collection apparatus, the ball is positioned between the rotation shaft  208  and the two poles. When the vertically helically extending blade is rotated, the training ball is moved vertically up along the rotation shaft and the two poles. The collected ball is then pushed into the upper opening of the ball container  104  of the training ball shooting apparatus  100 . 
     As shown in  FIG. 9 , the ball discharge tube  202  installed on the upper portion of the ball collection apparatus  200  is rotatable configured at the upper portion of the vertical cylindrical hollow tube  204 , as shown by “R” in  FIG. 9 . The ball discharge tube may be configured to rotate manually or rotate automatically by a motor via a ring gear 
       FIG. 10  is a detailed block diagram of a ball supply apparatus  300  according to an embodiment of the present invention. The apparatus is mounted on a column  250  erected perpendicular to the bottom surface of the play field  10 . This apparatus supply the ball to the player on the play field  10  by dropping the training ball to the player, or by flying the training ball in the horizontal direction toward the player on the play field  10 . This apparatus is useful for practicing the spiking action for the foot volleyball and the volleyball, and for practicing a three-point shoot for the basketball. 
     Referring to  FIG. 10 , the ball supply apparatus  300  has the housing  301  coupled to an upper portion of the column  250 . The top of the housing  301  is partially opened. The housing is divided by a partition  308  into a ball storage portion  304  and a ball discharge portion  306 . The bottom surface  305  of the ball storage portion  304  is inclined downward toward the ball discharge portion  306 . An opening is formed in the bottom of the ball discharge portion  306 . A ball discharge tube  316  discharging the training ball is rotatably coupled to the ball discharge portion  306  at the opening thereof. 
     Within the ball discharge portion  306 , a stopper  314  extends vertically upward from the distal end of the ball discharge tube  316 . This stopper acts to limit the movement of the discharged ball. A rotatable opening/closing plate  310  is rotatably coupled to the partition  308 . The rotatable opening/closing plate  310  is screw-coupled to a rotation shaft from an opening/closing motor  302  installed in the housing  301 . The rotatable opening/closing plate  310  is configured to open/close a discharge hole formed in a lower portion of the partition  308  by rotation of the opening/closing motor  302 . Thereby, the training ball accommodated in the ball storage portion  304  is not discharged or is discharged through the discharge hole to the discharge tube. 
     A straight bevel gear system  318  is disposed in a lower end of the housing  302 . A rack gear of the straight bevel gear system  318  is integrally formed with the outer peripheral face of the upper end of the ball discharge tube  316 . The rack gear is engaged with a drive gear of the straight bevel gear system  318 . The drive gear is coupled to a rotation shaft  322  of a swing motor  320  installed in the housing. The opening/closing motor  302  and the swing motor  320  are connected to a controller MCU  324 . The ball discharge tube  316  is configured to be inclined downward. The other end of the ball discharge tube  316  has a vertically falling outlet  316   a  formed in a rightly downward direction and a horizontally inclined outlet  316   b  formed in an inclined horizontal direction. The ball introduced into the ball discharge tube  316  is discharged to the vertical falling outlet  316   a  or the inclined horizontal outlet  316   b  by a switching plate  316   c  coupled between the vertical falling outlet  316   a  and the horizontally inclined outlet  316   b.    
     The switching plate  316   c  opens either the vertical falling outlet  316   a  or the horizontally inclined outlet  316   b  via a switching plate driving unit  316   d  constituted by a motor or the like. When the switching plate drive unit  316   d  is not used, the switching plate  316   c  may be opened and closed using a manual switching plate activator. When using the switching plate drive unit  316   d , the switching plate drive unit  316   d  is controlled by a controller  324  that receives a remote control signal from a remote control device. 
     For example, when the switching plate drive unit  316   d  vertically elects the switching plate  316   c , the vertical falling outlet  316   a  is opened and the horizontally inclined outlet  316   b  is closed. As a result, the training ball ejected from the ball discharge tube  316  goes straight downward. In contrast, when the switching plate drive unit  316   d  orients the switching plate  316   c  in the horizontal direction, the vertical falling outlet  316   a  is closed and the horizontally inclined outlet  316   b  is opened. As a result, the training ball discharged from the ball discharge tube  316  flies horizontally through the horizontally inclined outlet  316   b  and then gradually falls down. 
     As shown in  FIG. 10 , when the rotatable opening/closing plate  310 , which is shaft-coupled to the rotation shaft  312  of the opening/closing motor  302  rotates one time by 360 degree of a rotation angle, the discharge hole formed in the partition is opened once and then closed. Thereby, a single training ball is discharged through the ball discharge tube  316 . At this time, the ball may fall directly onto the bottom surface of the play field  10  through the vertical falling outlet  316   a  or may horizontally fly through the horizontally inclined outlet  316   b  and gradually falls to the bottom. This allows the player to practice hitting the balls falling in various directions from above, or allows the player to shooting the training ball flying horizontally. Thus, the player may practice spike attacks with the hand strongly hitting the training ball flying in the horizontal direction or falling directly down onto the bottom of the play field  10 . Further, the player may practice kicking the training ball flying in the horizontal direction or falling directly down onto the bottom of the play field  10 . 
     It is also possible to adjust the position of the ball discharge end of the ball discharge tube  316  by the rotation of the swing motor  320 . As a result, the drop position of the ball can be adjusted. This allows the player to practice at various positions. 
     The controller  324  may transmit/receive data to control the training ball shooting apparatus  100  in a wired or wireless manner. Thus, the controller may receive the ball distribution control signal by wire or wirelessly, and may control the opening/closing motor  302  and the swing motor  320 . For example, when the training ball shooting apparatus  100  is controlled using only a remote controller device, the controller  324  receive the data to control the training ball shooting apparatus  100  in a wireless manner from the remote controller device and drives the opening/closing motor  302  and the swing motor  320  based on the remote control signal transmitted from the remote controller device. Thus, the training ball accommodated in the ball storage portion  304  may be dropped to the bottom of the play field  10 . 
     The training ball shooting apparatus  100 , the ball collection apparatus  200 , and the ball supply apparatus  300  as configured as described above may be applied to the ball games, for example, the soccer, the foot volley ball, the volleyball, and the basketball. Depending on the type of each ball game, the location of the training ball shooting apparatus  100 , the ball collection apparatus  200 , and the ball supply apparatus  300  on the play field should be properly selected.  FIG. 11  to  FIG. 15 ,  FIG. 16 ,  FIG. 17  and  FIG. 18  show examples of the soccer-related training system, the foot volleyball training system, the volleyball training system and the basketball training system in accordance with various embodiment of the present disclosure respectively. 
     Embodiment of Soccer-Related Training System 
     Referring to  FIGS. 11 to 15 , the soccer-related training system  1  according to the preferred embodiment of the present invention includes the play field  10  having a predetermined width. In one corner of the end line region of the play field  10 , the training ball shooting apparatus  100  for shooting the training ball toward a player on the play field  10  as shown in  FIGS. 1 and 3  is installed. The ball collection apparatus  200 , which automatically collects the training balls collected toward the goal line and supplies the collected training balls to the training ball shooting apparatus  100 , is positioned in the corner of the end line region of the play field  10  nearby the training ball shooting apparatus  100 . A pair of the training ball shooting apparatus  100  and the ball collection apparatus  200  may be installed at the diagonal ends of the play field  10 , respectively. Each normal soccer goal post  12  is installed in the goal line area at both opposing ends of the play field  10 . 
     The play field  10  shown in  FIG. 11  is formed to be inclined downwards at 1 to 5 degrees θ from the half line HL to the goal line on both opposing ends thereof, as shown in  FIG. 12 . Each ball guide groove line  14  is formed in rear of the goal line side, more specifically, in rear of each goal post  12 . The groove line  14  is downwardly inclined from one corner to the other corner. The training ball, which has fallen to the bottom of the play field  10 , rolls along each downward inclined face of the play field into each goal line and enters each ball guide groove line  14 . The training ball introduced into each ball guide groove line  14  is collected along each downward inclined face of each ball guide groove line  14  toward each gate G of each ball collection apparatus  200  installed on each corner side. 
     In order to use the soccer-related training system  1  configured as shown in  FIG. 11 , one of the training ball shooting apparatuses  100  installed on both sides of the play field  10  must be activated. This activation can be made by the player&#39;s remote control device. When the operation mode of the training ball shooting apparatus  100  activated by using the remote controller is set to the manual/automatic setting mode or the motion detection mode, the training ball shooting apparatus  100  is configured to fire the ball toward the player on the play field  10 . Thus, the player in the play field to may kick or head the training ball fired from the training ball shooting apparatus  100  in at least one mode of the penalty kick mode, the corner kick set play mode, the ground ball shoot mode, the volley ball shoot mode, or the heading shoot mode. In this connection, when the player kicks the ball fired from the training ball shooting apparatus to toward the goalpost  12 , the training ball enters the goalpost  12 . 
     The present invention includes a technical arrangement for sensing and scoring the entry of the training ball into the goalpost  12 . 
     In front or rear of the goalpost  12 , a ball sensing gate BSG as shown in  FIG. 14  is installed. Preferably, the ball sensing gate BSG is mounted in rear of the goalpost  12 . The ball sensing gate BSG may be made of a pipe material as in the goalpost  12 . The gate is of a rectangular shape. On the upper side and the left side of the ball sensing gate BSG having the rectangular frame shape, arrays of a plurality of regularly and spacedly arranged light emitting devices (e.g., light emitting diodes, infrared light emitting diodes, etc.) are installed. On the lower side and the right side of the ball sensing gate BSG, arrays of a plurality of regularly spaced light receiving elements (for example, an infrared photodiode or phototransistor, etc.) are provided. 
     When the training ball passes through a particular zone within the goalpost  12 , the ball sensing gate BSG is configured to determine the particular zone within the goalpost  12 . This will be more dearly understood from the following description. In addition, a speed gun SG for measuring the speed of the training ball flying toward the goalpost  12  is installed behind the ball sensing gate BSG. 
     The soccer-related training system  1  according to the embodiment of the present invention has been described with respect to the example of the soccer game where a plurality of people may enjoy together. However, the soccer-related training system  1  is equally applicable to a 5-player mini-soccer game played indoors like futsal. For example, the players may alternate soccer practice and futsal practice. Depending on whether the current played game is football or futsal, the position of the goalpost  12  installed on the play field  10  may vary. For example, installing movable wheels on the bottom of the goalpost  12  may be considered. Thus, the goalpost  12  may be installed on the futsal play field that can be easily configured indoors. Further, the goalpost  12  may be moved to the larger soccer play field. 
     Score Calculation when Training Ball Passes Through Goalpost 
     When the training ball passes through the goalpost  12  shown in  FIG. 11 , this is sensed by the sensors of the ball sensing gate BSG shown in  FIG. 14 . The sensors of the ball sensing gate BSG include the arrays of the light emitting devices XL 1  to XL 4  (left side) and YL 1  to YL 10  (upper side), and the corresponding arrays of the light receiving device XP 1  to XP 4  (right side) and YP 1  to YP 10  (lower side). 
       FIG. 14  shows an embodiment of the ball sensing gate BSG. The region within the goalpost is divided into 40 sub-regions. Each score is assigned to each sub-region. The ball sensing gate BSG is configured to sense that the training ball passes through a specific sub-region. In  FIG. 14 , numerals “0 to 10” shown in the sub-regions indicate scores for sub-regions. 
     Referring to  FIG. 13 , the ball sensing gate BSG coupled to the rear portion of the goalpost  12  includes the light emitting devices arrays XL 1  to XL 4  and YL 1  to YL 10  arranged along the left and upper sides of the ball sensing gate BSG respectively, and the light receiving elements arrays XP 1  to XP 4  and YP 1  to YP 10  arranged along the right and lower sides of the sensing gate BSG respectively. In this connection, the light emitting devices array XL 1  to XL 4  and the light receiving devices array XP 1  to XP 4  arranged along the left and right sides of the ball sensing gate BSG in a rectangular box shape respectively are spacedly arranged at a regular interval of 610 mm. The interval of 610 mm is equal to a value of a height of 2440 mm of the goalpost  12  divided by 4. In this connection, the light emitting devices array YL 1  to YL 10  and the light receiving devices array YP 1  to YP 10  arranged along the upper and lower sides of the ball sensing gate BSG in a rectangular box shape respectively are spacedly arranged at a regular interval of 732 mm. The interval of 732 mm is equal to a value of a length of 7320 mm of the goalpost  12  divided by 10. 
     At least three light emitting elements are provided at equal intervals in each of the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 . At least three light receiving elements are provided at equal intervals in each of the light receiving elements XP 1  to XP 4  and YP 1  to YP 10  corresponding to the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 . Each of the light emitting devices XL 1  to XL 4  and YL 1  to YL 10  constituted as described above is driven to emit based on X axis and Y axis driving signals. Each of the light receiving elements XP 1  to XP 4  and YP 1  to YP 10  constituted as described above detects each light beam emitted from each of the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 . 
     In the above example, at least three light emitting elements are provided at equal intervals in each of the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 , and at least three light receiving elements are provided at equal intervals in each of the light receiving elements XP 1  to XP 4  and YP 1  to YP 10  corresponding to the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 . However, the present invention is not limited thereto. In order to improve the sensing intensity, the larger number of the light emitting elements are provided at equal intervals in each of the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 , and the larger number of the light receiving elements are provided at equal intervals in each of the light receiving elements XP 1  to XP 4  and YP 1  to YP 10  corresponding to the light emitting elements XL 1  to XL 4  and YL 1  to YL 10 . 
     A controller (not shown) drives the light emitting elements arrays XL 1  to XL 4  and YL 1  to YL 10  of the ball sensing gate BSG and reads the outputs from the light receiving elements arrays XP 1  to XP 4  and YP 1  to YP 10 , thereby to determine the sub-area within the goalpost  12  through which the ball passes. In addition, the controller receives the ball speed of the training ball sensed at the speed gun SG. The controller may calculate a total score based on scores corresponding to the determined sub-area and the ball speed, and display the total score on the display device (not shown). The controller may be referred to as a score counter SCNT. 
     Referring to  FIG. 14 , the score counter SCNT includes: light emitting drivers arrays LD 1  and LD 2  configured to drive the light emitting elements arrays XLi and YLj (where i is an integer of 1 to 4 and j is an integer of 1 to 10) provided on the X axis and Y axis of the ball sensor gate BSG via emission control signals; optical signal receivers arrays PR 1  and PR 2  configured to read the outputs from the light receiving device arrays XPi and YPj corresponding to the X-axis and Y-axis light emitting device arrays XLi and YLj of the ball sensing gate BSG and receiving the light sources (infrared rays) from the light emitting device arrays XLi and YLj; a score calculator SCNT configured to drive the light emitting drivers arrays LD 1  and LD 2  to turn on the light emitting elements arrays XLi and YLj, to determine a ball passing-through sub-area in the goalpost  12  based on the read output signals from the optical signal receivers arrays PR 1  and PR 2 , to receive an impact signal from an impact sensor IS installed at the goalpost  12  or the ball sensor gate BSG and/or the speed measured by the speed-gun SG installed at the rear of the goalpost  12 , and to calculate a total score based on the determined ball passing-through sub-area, the impact signal and/or the speed; and a display DISP for externally displaying the total score calculated from the score calculator. In the above embodiment, the light emitting drivers arrays LD 1  and LD 2  and the optical receivers arrays PR 1  and PR 2  are provided. However, the score calculator SCNT itself is configured to drive the light emitting element arrays XLi and YLj collectively and to read the outputs from the light receiving elements arrays XPi and YPj. In this case, it may dispense with the light emitting drivers arrays LD 1  and LD 2  and the optical receivers arrays PR 1  and PR 2 . 
     Referring to  FIGS. 13 and 14 , the operation of calculation of the score when the training ball passes through the goalpost will be described. 
     When the soccer-related training system  1  is operated, the score calculator SCNT as shown in  FIG. 14  supplies light emitting signals to the light emitting drivers arrays LD 1  and LD 2  to turn on the light emitting elements arrays XLi and YLj provided on the X axis and Y axis of the ball sensor gate BSG as shown in  FIG. 14 . The light emissions from the light emitting elements arrays XLi and YLj are received from the light receiving device arrays XPi and YPj corresponding to the light emitting devices arrays XLi and YLj respectively. Upon receiving the light emissions from the light emitting elements arrays XLi and YLj, the light receiving device arrays XP 1  and YPj may transmit sensing signals indicating the light emissions to the optical receivers arrays PR 1  and PR 2  respectively. 
     Normally, since the ball does not pass through within the goalpost  12 , all of light beams emitted from the light emitting element arrays XLi and YLj arranged on the left side of the X axis and the upper side of the Y axis are received by the light receiving elements arrays XPi and YPj on without interruption of the light beams. Therefore, when the ball does not enter the goalpost  12 , the detection signals detected by the light receiving elements arrays XPi and YPj are identical with each other, and the detection signals are provided to the score calculator SCNT through the optical receivers arrays PR 1  and PR 2 . 
     The score calculator SCNT determines whether there are blocked light beams when the light beams corresponding to the detection signals received through the optical receivers arrays PR 1  and PR 2  are received by the light receiving elements array s XPi and YPj. In this way, which sub-region in the goalpost  12  the ball passed through is determined. When the ball does not pass through within the goalpost  12 , all of the sensing signals from the light receiving elements arrays XPi and YPj will remain active logic “high”. 
     When the training ball shot by the player passes through the “A” sub-region of  FIG. 14 , the light beams emitted by the light emitting elements XL 1  and YL 1  are momentarily blocked by the training ball passing through the “A” sub-region. As a result, only the outputs from the two photoreceptors XP 1  and YP 1  instantaneously become inactive logic “low”. This inactive logic “low” is supplied to the score calculator SCNT via the optical receivers PR 1 , PR 2 . In this connection, the score calculator SCNT determines that the outputs from the two photo-receivers XP 1  and YP 1  are inactive, and recognizes that the training ball has passed through the “A” sub-region of  FIG. 14 . In this way, the score calculator SCNT assigns “10” points to the current shoot according to the predetermined scoring rule. 
     Then, the score calculator SCNT reads the speed information on the training ball detected by the speed gun SG installed behind the goalpost  12 . The score calculator SCNT assigns a weight based on the speed information to the goalpost passing score “10”, thereby to determine a final goalpost passing score. The score calculator SCN displays the training ball passing sub-region and the final goalpost passing score on the display DISP. As a result, the player may know which sub-zone in the goalpost the ball has passed through. Thus, the player may be more interested in practicing. Regarding the weight, the weight 1 is assigned when the speed of the ball is 60 Km/h or more, while the weight 0.5 is assigned when the speed is less than 60 Km/h. Even though the balls passed through the same sub-region, the scores for the balls differ depending on the speeds of the balls. 
     When the training ball shot by the player passes through the boundary zone between the “A” sub-region and the “B” sub-region of the ball sensing gate BSG, the score calculator SCNT assigns a point “9” which is an average between “10” corresponding to the “A” sub-region and “8” corresponding to the “B” sub-region. Next, a weight according to the speed detected by the speed gun SG is given to the point “9”, thereby to determine the goalpost passing score, which, in turn, is displayed on the display DISP. In addition, when the training ball passes through a specific sub-region of the ball sensor gate BSG, the impact sensor IS installed at the goalpost  12  may detect the impact level. In this case, the score calculator SCNT assigns a score of ‘10’ as the goalpost passing score regardless of the sub-regions through which the training ball passes. 
     As described above, in the soccer-related training system according to the present invention, when the player shoots a ball toward the goalpost, the ball passing-through sub-region in the goalpost and the speed of the ball are sensed, and, thus, the ball passing-through sub-region in the goalpost and the ball passing-through score are displayed on the display. This allows the player to practice with greater interest. In addition, it is easy to recognize a specific sub-region which the ball has passed through, so that the shooting posture and the like may be corrected more quickly. 
     Although not specifically described in the above embodiments, infrared ray or light sensors may be arranged in the longitudinal and vertical directions of the goalpost  12  at an interval equal to a diameter of the ball. Thus, a specific sub-region in the goalpost which the training ball passing through may be detected. The kick corresponding to the training ball may be scored for the specific sub-region in the goalpost  12  which the ball passes through. This allows the player to know the player&#39;s score for the kick. For example, when the ball passes through the four corners in the goalpost  12 , the score  10  may be assigned. As a specific sub-region in the goalpost  12  which the ball passes through is closer to the central region in the goalpost  12 , the score for the kick corresponding to the ball gradually decreases. 
     Embodiment of Foot Volleyball-Related Training System 
     In the foot volleyball, a net is placed between the two teams. The player uses only the head and feet to pass the ball towards the opponent&#39;s team court. The player receives a ball flying toward his or her court, and attacks the ball at a higher position than the net. The strong attacks of the ball toward the opposing court is referred to as a spike attack. 
     The foot volleyball training system  1  according to a preferred embodiment of the present invention includes the play field  10  defined by the end lines, the side lines and the half line, as shown in  FIG. 16 . Three training ball shooting apparatuses  100 , G 1  and G 2  are installed at the corner portions of the play field  10  where the end lines and the side lines are in contact with each other, thereby to fire the training ball toward the opposing court of the play field  10 . In addition, a ball collection apparatus  200 , which automatically collects the training balls collected at the end lines and supplies the collected training ball to the training ball shooting apparatus  100 , is installed at the corner of the play field  10 . A ball supply apparatus  300  for dropping the ball onto the court of the play field  10  nearby the net is installed at an intersection between the half line and side line, preferably at a position adjacent to a net pole POL where the net NET is installed. Thus, the balls stored in a ball storage portion  304  of the ball supply apparatus  300  is supplied through a lower ball distribution or discharge pipe  316 . Although the ball supply apparatus  300  is installed closer to the position adjacent to the net pole POL on the play field  10  in this embodiment, the present disclosure is not limited thereto. It may be recognized that the ball supply apparatus  300  may be installed in various positions. 
     The ball supply apparatus  300  may hang on a pipe extending in a transverse direction or a longitudinal direction above the play field  10 . However, in this embodiment, the ball supply apparatus  300  is installed on an upper portion of a vertical column  250 . However, the present disclosure is not limited thereto. The training ball shooting apparatus  100  and G 1  and G 2  each has a camera CAM for photographing an object in front of them. The camera may be installed on each of front faces of the training ball shooting apparatuses. 
     The ball discharge tube  202  of the ball collection apparatus  200  is connected to one end of a ball convey tube  251 . The other end of the ball convey tube  251  is connected to the opening of the ball storage portion  304  of the ball supply apparatus  300 . In this connection, said one end of the ball conveying tube  521  is located higher than the other end thereof. For example, when the training ball is placed at said one end of the ball convey tube  251 , the ball is naturally transferred to the other end by the ball&#39;s own weight because the tube  251  is inclined downwardly toward the other end thereof. Along the half line of the play field  10 , the net NET is installed in the lateral direction. 
     The play field  10  shown in  FIG. 16  is formed to be inclined downwards at 1 to 5 degrees θ from the half line HL to the end lines on both opposing ends thereof, as shown in  FIG. 12 . Each ball guide groove line  14  is formed in rear of the end line. The groove line  14  is downwardly inclined from one corner to the other corner. The training ball, which has fallen to the bottom of the play field  10 , rolls along each downward inclined face of the play field into each end line and enters each ball guide groove line  14 . The training ball introduced into each ball guide groove line  14  is collected along each downward inclined face of each ball guide groove line  14  toward each gate G of each ball collection apparatus  200  installed on each corner side. 
     Each of the training ball shooting apparatuses G 1  and G 2  shown in  FIG. 1  is also provided with a ball container  104 , though this is not specifically shown in the drawing for showing this embodiment of the present invention. The training ball may be manually inserted into the ball container  104  of each of the training ball shooting apparatuses G 1  and G 2  installed at each corner portion. Alternatively, the ball may be transferred from the ball collection apparatus  200  described above to each of the training ball shooting apparatuses G 1  and G 2 . 
     Ball Receive Mode for Foot Volleyball 
     The training ball shooting apparatuses  100 , G 1  and G 2  installed on the play field  10  of the foot volleyball-related training system  2  according to the embodiment of the present invention may be activated using a remote control device as described in the soccer-related training system. When the operation mode of one of the training ball shooting apparatuses  100 , G 1  and G 2  activated by using the remote controller device is a manual/automatic setting mode or a motion detection mode, the training ball shooting apparatus  100  fires the ball toward the player on the opposing court of the play field  10 . In this connection, the player may practice the foot volleyball receive practice by receiving the ball shot from the training ball shooting apparatus  100 , G 1  or G 2  with his foot or head and at the same time, pushing the ball over the net toward the opposing court of the play field  10 . 
     In the foot volleyball-related training system  2  according to this embodiment of the present invention, the ball supply apparatus  200  as illustrated in  FIG. 10  is installed on the side line of the play field  10  as shown in  FIG. 1 . 
     Spike Mode for Foot Volleyball 
     The spike mode for the foot volleyball-related training system  2  is set by the touch screen TS provided on the body frame  102  of the training ball shooting apparatus  100  or the remote control device. 
     When the spike mode is set by the key button of the touch screen TS, the control unit MPU shown in  FIG. 6  transmits the setting information to the controller  324  in the ball supply apparatus  300  shown in  FIG. 10 . Data transmission/reception between the control unit MPU in  FIG. 6  and the controller  324  in the ball supply apparatus  300  may be performed in a wired or wireless manner. This data includes a spike ball distribution control signal based on image information captured by the camera CAM. For example, when the operation mode is the spike mode, and the camera CAM may detect a predetermined motion (e.g., lifting the arm up) of the player, or the spike mode setting signal is received from the remote control device held by the user, the spike ball distribution control signal is transmitted to the controller  324  of the ball supply apparatus  300 . 
     When the user sets the spike mode using the remote controller device, the ball supply apparatus  300  is driven. When the ball supply apparatus  300  is driven, the training ball is discharged from the vertical falling outlet  316   a  or the horizontally inclined outlet  316   b  of the ball supply pipe  316  of the ball supply apparatus  300 , as described above with reference to  FIG. 10 . That is, the ball falls vertically onto the court of the play field  10  or flies horizontally. As a result, the player may practice spikes by hitting the vertically falling ball or hitting the training ball flying horizontally. 
     As described above, the foot volleyball training system according to the present invention fires a service ball at the end line of the foot volleyball court, or vertically drops the ball, or fire the ball horizontally from the position close to the sideline. This allows the foot volleyball player to more efficiently practice the ball receive action and spike action. 
     Ball Supply to Ball Supply Apparatus 
     In connection with the supply of the ball from the ball collection apparatus  300  to the ball supply apparatus  200 , the ball discharge tube  202  installed on the top of the ball collection apparatus  200  in the configuration of  FIG. 9  is rotated in the “R” direction to vertically overlap with the ball conveying tube  251 . When the discharge port of the ball discharge tube  202  overlaps the ball conveying tube  251 , the collected training balls are discharged from the discharge port and flows along the downwardly inclined ball conveying tube  251  into the upper opening in the storage portion  304  of the ball supply apparatus  300 . 
     Embodiment of Volleyball-Related Training System 
     In the volleyball, a net is placed between the two teams. The player uses the hands to pass the ball towards the opponent&#39;s team court. The player receives a ball flying toward his or her court, and spike-attacks the ball at a higher position than the net. The strong attacks of the ball toward the opposing court is referred to as a spike attack. This volleyball training system  3  allow the player to practice the ball receive and spike actions. 
     The volleyball training system  3  according to a preferred embodiment of the present invention includes the play field  10  defined by the end lines, the side lines and the half line, as shown in  FIG. 17 . A first training ball shooting apparatus  100  is installed at the corner portion of the play field  10  where the end lines and the side lines are in contact with each other, thereby to fire the training ball toward the opposing court of the play field  10 . In addition, a ball collection apparatus  200 , which automatically collects the training balls collected at the end lines and supplies the collected training ball to the training ball shooting apparatus  100 , is installed at the corner of the play field  10 . A second training ball shooting apparatus  100   a  is installed on the side line of the play field  10 . The second training ball shooting apparatus  100   a  is manually driven. In one example, the ball collection apparatus  200  is adjacent to the training ball shooting apparatus  100  to feed the ball automatically to the training ball shooting apparatus  100 . In one example, the ball collection apparatus  200  is coupled via the ball convey tube to the training ball shooting apparatus  100  such that the ball is discharged from the ball discharge tube  202  of the ball collection apparatus  200  and flows along the downwardly inclined convey tube and is inserted into the opening of the ball storage portion of the training ball shooting apparatus  100 . The play field  10  shown in  FIG. 17  is formed to be inclined downwards at 1 to 5 degrees θ from the half line HL to the end lines on both opposing ends thereof, as shown in  FIG. 12 . Each ball guide groove line  14  is formed in rear of the end line. The groove line  14  is downwardly inclined from one corner to the other corner. The training ball, which has fallen to the bottom of the play field  10 , rolls along each downward inclined face of the play field into each end line and enters each ball guide groove line  14 . The training ball introduced into each ball guide groove line  14  is collected along each downward inclined face of each ball guide groove line  14  toward each gate G of each ball collection apparatus  200  installed on each corner side. Each of the training ball shooting apparatuses  100  and  100   a  is also provided with a ball container  104 , though this is not specifically shown in the drawing for showing this embodiment of the present invention. The training ball may be manually inserted into the ball container  104  of the training ball shooting apparatus  100   a.    
     A ball supply apparatus  300  for dropping the ball onto the court of the play field  10  nearby the net is installed at an intersection between the half line and side line, preferably at a position adjacent to a net pole POL where the net NET is installed. Thus, the balls stored in a ball storage portion  304  of the ball supply apparatus  300  is supplied through a lower ball distribution or discharge pipe  316 . Although the ball supply apparatus  300  is installed closer to the position adjacent to the net pole POL on the play field  10  in this embodiment, the present disclosure is not limited thereto. It may be recognized that the ball supply apparatus  300  may be installed in various positions. The ball supply apparatus  300  may hang on a pipe extending in a transverse direction or a longitudinal direction above the play field  10 . However, in this embodiment, the ball supply apparatus  300  is installed on an upper portion of a vertical column  250 . However, the present disclosure is not limited thereto. The first and second training ball shooting apparatuses  100  and  100   a  each has a camera CAM for photographing an object in front of them. The camera may be installed on each of front faces of the training ball shooting apparatuses. 
     The column  250  may be positioned on a guide rail  252  spaced apart from and parallel to the side line of the play field  10 . Thus, the column  250  may be movable along the side line of the play field  10  on the guide rail  252 . In this connection, the top of the column  250  is formed to be higher than the height of the net pole POL installed on the play field  10 . Roller wheels  251  are attached to the bottom of the column  250 . Thus, the column  250  slides in the front-rear direction on and along the guide rail  252 . Of course, the roller wheels  251  may be coupled to fixing means such that the wheels  251  is not movable on the guide rail  252 . 
     Thus, the column  250 , coupled with the ball supply apparatus  300 , may be moved along the guide rail  252  to be located proximate the ball discharge tube  202  of the ball collection apparatus  200 . In this connection, the ball discharge tube  202  of the ball collection apparatus  200  is rotated so that the ball discharge tube  202  overlaps the upper portion of the ball supply apparatus  300 . At this time, the training ball supplied from the ball collection apparatus  200  enters the ball storage portion  304  of the ball supply apparatus  300 . Alternatively, the ball discharge tube  202  of the ball collection apparatus  200  is connected to one end of the ball convey tube  251 . The other end of the ball convey tube  251  is connected to the opening of the ball storage portion  304  of the ball supply apparatus  300 . In this connection, said one end of the ball conveying tube  521  is located higher than the other end thereof. For example, when the training ball is placed at said one end of the ball convey tube  251 , the ball is naturally transferred to the other end by the ball&#39;s own weight because the tube  251  is inclined downwardly toward the other end thereof. 
     Ball Receive and Spike Modes for Foot Volleyball 
     The training ball shooting apparatus  100  installed on the play field  10  of the volleyball-related training system  2  according to the embodiment of the present invention may be activated using a remote control device as described in the soccer-related training system. When the operation mode of one of the training ball shooting apparatus  100  activated by using the remote controller device is a manual/automatic setting mode or a motion detection mode, the training ball shooting apparatus  100  fires the ball toward the player on the opposing court of the play field  10 . In this connection, the player may practice the volleyball receive practice by receiving the ball shot from the training ball shooting apparatus  100  with his hand and at the same time, pushing the ball over the net toward the opposing court of the play field  10 . 
     The spike mode for the volleyball-related training system  2  is set by the touch screen TS provided on the body frame  102  of the training ball shooting apparatus  100  or the remote control device. When the spike mode is set by the key button of the touch screen TS, the control unit MPU shown in  FIG. 6  transmits the setting information to the controller  324  in the ball supply apparatus  300  shown in  FIG. 10 . Data transmission/reception between the control unit MPU in  FIG. 6  and the controller  324  in the ball supply apparatus  300  may be performed in a wired or wireless manner. This data includes a spike ball distribution control signal based on image information captured by the camera CAM. For example, when the operation mode is the spike mode, and the camera CAM may detect a predetermined motion (e.g., lifting the arm up) of the player, or the spike mode setting signal is received from the remote control device held by the user, the spike ball distribution control signal is transmitted to the controller  324  of the ball supply apparatus  300 . When the user sets the spike mode using the remote controller device, the ball supply apparatus  300  is driven. When the ball supply apparatus  300  is driven, the training ball is discharged from the vertical falling outlet  316   a  or the horizontally inclined outlet  316   b  of the ball supply pipe  316  of the ball supply apparatus  300 , as described above with reference to  FIG. 10 . That is, the ball falls vertically onto the bottom of the play field  10  or flies horizontally. As a result, the player may practice spikes by hitting the vertically falling ball or hitting the training ball flying horizontally. 
     As described above, the volleyball training system according to the present invention fires a service ball at the end line of the volleyball court, or vertically drops the ball, or fire the ball horizontally from the position close to the sideline. This allows the volleyball player to more efficiently practice the ball receive action and spike action. 
     Ball Supply to Ball Supply Apparatus 
     In order that the supply of the ball from the ball collection apparatus  200  to the ball supply apparatus  300 , the column  250  is pushed toward the ball collection apparatus  200 , and, thus, the column  250  moves along the guide rail  252  in the forward and backward directions using its roller wheels  251 . In this way, the ball supply apparatus  300  is adjacent to the ball collection apparatus  200 . The ball supply apparatus  300  is positioned below the ball discharge tube  202  of the ball collection apparatus  200 . The discharge direction of the ball discharge tube  202  of the ball collection apparatus  200  is directed to toward the upper opening of the ball storage portion  304  of the ball supply apparatus  300 . The ball collection apparatus  200  is operated to collect the training ball collected in the ball guide groove line  14  and discharge the ball into the upper ball distribution pipe  316 . Then, the collected training ball is introduced into the ball storage portion  304  of the ball supply apparatus  300 . Alternatively, in order that the supply of the ball from the ball collection apparatus  300  to the ball supply apparatus  200 , the ball discharge tube  202  installed on the top of the ball collection apparatus  200  in the configuration of  FIG. 9  is rotated in the “R” direction to vertically overlap with the ball conveying tube  251 . When the discharge port of the ball discharge tube  202  overlaps the ball conveying tube  251 , the collected training balls are discharged from the discharge port and flows along the downwardly inclined ball conveying tube  251  into the upper opening in the storage portion  304  of the ball supply apparatus  300 . 
     Embodiment of Basketball-Related Training System 
     Basketball is a game in which two teams, each time having five players pass or dribble the ball and throw it into the basket of the opponent team. This basketball-related training system allows the practitioner to practice a ball receive practice by shooting the training ball in the form of a pass action toward the player on the basketball court or to practice a three-point shoot practice by dropping the ball onto a three-point shoot area. 
     The basketball training system  4  according to a preferred embodiment of the present invention includes the play field  10  defined by the end lines, the side lines and the half line. The play field  10  is formed to be inclined downwards at 1 to 5 degrees θ from the half line HL to the end lines on both opposing ends thereof, as shown in  FIG. 12 . Each ball guide groove line  14  is formed in rear of the end line. The groove line  14  is downwardly inclined from one corner to the other corner. The training ball, which has fallen to the bottom of the play field  10 , rolls along each downward inclined face of the play field into each end line and enters each ball guide groove line  14 . 
     In this embodiment, as shown in  FIG. 19 , the training ball introduced into each ball guide groove line  14  is collected along each downward inclined face of each ball guide groove line  14  toward each gate G of each ball collection apparatus  200  installed on each corner side. Each downward inclined face of each ball guide groove line  14  is configured such that a first downwardly inclined face is formed from one end of the line toward a middle portion of the line and a second downwardly inclined face is formed from the other end of the line toward the middle portion of the line. Thus, the ball is collected at the middle portion of the line  14  as shown in  FIG. 19 . In this connection, the ball collection apparatus  200  is installed at the middle portion of the line  14 . In addition, the goalpost having a basket BG attached thereto is installed near the end line of the play field  10 . 
     A training ball shooting apparatus  100  is installed at the corner portion of the play field  10  where the end lines and the side lines are in contact with each other, thereby to fire the training ball toward the player on the play field  10 . In addition, a ball collection apparatus  200 , which automatically collects the training balls collected at the end lines and supplies the collected training ball to the training ball shooting apparatus  100 , is installed at the corner of the play field  10 . A second training ball shooting apparatus  100   a  is installed in rear of the goalpost BG of the play field  10 . The second training ball shooting apparatus  100   a  is manually driven. In one example, the ball collection apparatus  200  is adjacent to the training ball shooting apparatus  100  to feed the ball automatically to the training ball shooting apparatus  100 . In one example, the ball collection apparatus  200  is coupled via the ball convey tube to the training ball shooting apparatus  100  such that the ball is discharged from the ball discharge tube  202  of the ball collection apparatus  200  and flows along the downwardly inclined convey tube and is inserted into the opening of the ball storage portion of the training ball shooting apparatus  100 . 
     A ball supply apparatus  300  for dropping the ball onto the court of the play field  10  may be installed nearby the side line of the play field  10 . The balls stored in a ball storage portion  304  of the ball supply apparatus  300  is supplied through a lower ball distribution or discharge pipe  316  onto the 3 point shoot area on the play field  10 . The ball supply apparatus  300  may hang on a pipe extending in a transverse direction or a longitudinal direction above the play field  10 . Further, in another embodiment, the ball supply apparatus  300  is installed on an upper portion of a vertical column  250 . However, the present disclosure is not limited thereto. The first and second training ball shooting apparatuses  100  and  100   a  each has a camera CAM for photographing an object in front of them. The camera may be installed on each of front faces of the training ball shooting apparatuses. Although the ball supply apparatus  300  is installed closer to the position adjacent to the side or end line on the play field  10  in this embodiment, the present disclosure is not limited thereto. It may be recognized that the ball supply apparatus  300  may be installed in various positions. 
     The training ball shooting apparatus  100  installed on the play field  10  may be activated using a remote control device as described in the soccer-related training system. When the operation mode of one of the training ball shooting apparatus  100  activated by using the remote controller device is a manual/automatic setting mode or a motion detection mode, the training ball shooting apparatus  100  fires the ball toward the player on the play field  10 . In this connection, the player may practice the ball receive practice by receiving the ball shot from the training ball shooting apparatus  100  with his hand and at the same time, pushing the ball toward the basket BG. When the ball supply apparatus  300  is driven, the training ball is discharged from the vertical falling outlet  316   a  or the horizontally inclined outlet  316   b  of the ball supply pipe  316  of the ball supply apparatus  300 , as described above with reference to  FIG. 10 . That is, the ball falls vertically onto the 3 point shoot area on the play field  10  or flies horizontally toward the player in a pass action form. As a result, the player may practice the ball receive or 3 point shoot practice. 
     As shown in  FIG. 10 , when the rotatable opening/closing plate  310 , which is shaft-coupled to the rotation shaft  312  of the opening/closing motor  302  rotates one time by 360 degree of a rotation angle, the discharge hole formed in the partition is opened once and then closed. Thereby, a single training ball is discharged through the ball discharge tube  316 . At this time, the ball may fall directly onto the bottom surface of the play field  10  through the vertical falling outlet  316   a  or may horizontally fly through the horizontally inclined outlet  316   b  and gradually falls to the bottom. This allows the player to practice receiving the balls falling in various directions, and/or to shoot the balls into the basket. It is also possible to adjust the position of the ball discharge end of the ball discharge tube  316  by the rotation of the swing motor  320 . As a result, the drop position of the ball can be adjusted. This allows the player to practice the 3 point shoot practices at various positions. 
     The controller  324  may transmit/receive data to control the training ball shooting apparatus  100  in a wired or wireless manner. Thus, the controller may receive the ball distribution control signal by wire or wirelessly, and may control the opening/closing motor  302  and the swing motor  320 . For example, when the training ball shooting apparatus  100  is controlled using only a remote controller device, the controller  324  receive the data to control the training ball shooting apparatus  100  in a wireless manner from the remote controller device and drives the opening/closing motor  302  and the swing motor  320  based on the remote control signal transmitted from the remote controller device. Thus, the training ball accommodated in the ball storage portion  304  may be dropped to the 3 point shoot area on the play field  10 . This may allow the player to practice the 3 point shoot practices on her/his own. 
     In connection with the supply of the ball from the ball collection apparatus  300  to the ball supply apparatus  200 , the ball discharge tube  202  installed on the top of the ball collection apparatus  200  in the configuration of  FIG. 9  is rotated in the “R” direction to vertically overlap with the ball conveying tube  251 . When the discharge port of the ball discharge tube  202  overlaps the ball conveying tube  251 , the collected training balls are discharged from the discharge port and flows along the downwardly inclined ball conveying tube  251  into the upper opening in the storage portion  304  of the ball supply apparatus  300 . 
     As described above, the basketball-related training system in accordance with the present invention fires the balls toward on a player on a basketball court and supplies balls to various areas including a three-point shooting area. Thus, the basketball practitioner receive the training ball supplied at various positions by his hand, and may practice various shoots including the 3 point shoots on his own. In addition, the balls dropped on the play court may be automatically supplied via the ball collection apparatus  200  to the training ball shooting apparatus  100  and the ball supply apparatus  300 , which makes basketball practice more efficient.