JPH01500724A - Program control device for tennis practice machine - Google Patents

Abstract

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

Description

[Detailed description of the invention] Program control device for tennis practice machine Technical field The present invention relates to a sports training machine, and particularly to a program control device for a tennis practice machine. It is related to

Background of the invention As a known technique, there is a programming device consisting of a cam mechanism. (For example, Patent No. 7,627,076, International Classification G25 G21100 Published in 1977 Notice). In this cam mechanism, many cams are mounted side by side on one drive shaft. Each cam consists of a disk fixed to a shaft and has a wedge-shaped program change. It has a plurality of radially extending groove-like guides for receiving the members.

The outer surface of the program member protrudes from the disc and each has a changeable cam. defines the outline. The wedge engages an arm operatively connected to the respective mechanism. It is designed to. Predetermined using interchangeable wedges with various shapes and heights The arm movement program can be preset by obtaining the desired cam shape. As such, the portion of each wedge protruding from the disk has a predetermined shape and height.

The wedges are frictionally retained in radial grooves in the respective disks.

When such a conventional cam mechanism is used as a program control device, each The change in cam shape is discrete and determined by the on-hand inventory of stepped wedges. Mau. Also, since it is not possible to change the cam shape continuously, the cam mechanism is programmed. When used as a control device, it is difficult to change the amount of arm movement steplessly; This becomes noticeable when applied to a varnish training machine, and this The possibilities for adjusting the program control device are limited.

Furthermore, selecting and replacing wedges is a tedious task, requiring specific techniques and high costs. I will do it.

Therefore, in the conventional program control device, program adjustment can be performed quickly. There's little chance of going. Athletes and coaches can get creative by creating advanced and complex programs. It becomes difficult to perform regular exercises.

Summary of the invention The main purpose of the present invention is to address the various working processes in each mechanism of a tennis training machine. Program elements configured and arranged to allow quick and stepless setting of programs An object of the present invention is to provide a program control device for a tennis practice machine having the following features. This issue The purpose is to connect a drive shaft, which is fixed to the drive shaft and operatively coupled to the mechanism of the tennis practice machine. radially extending programmable members retainable in the arm for controlling them; A program control device for a tennis practice machine equipped with a disc having a plurality of guides. According to the present invention, the program member is movable along a radial guide. This is achieved by having a roller shape that allows it to be held in a set position. It will be done.

movable along a radial guide and held at a variable distance from the center of rotation of the drive shaft By providing a program member in the shape of a roller that can be held, you can practice at any time. You can change the position of the program parts in the guide of the disk without disturbing the progress of learning, and move the arm. and the amount of movement of the tennis practice machine mechanism operatively coupled thereto.

This device allows coaches and players to program the action of a tennis practice machine quickly and steplessly. The adjustment movement of the rollers during the radial guidance can be adjusted by means of screws and nuts. It is preferable to use pairs of nuts, in which case each pair of nuts is rotated by a roller. The screws are rotatably coupled, and the screws are provided with their heads protruding from the disc.

The nut is connected to the roller using a pair of screw and nut installed in the disc. of each roller by simply rotating the screw head in any direction. Stepless movement in the radial direction in each disc is possible.

All discs have the same number of radial guides, and each radial guide on all discs It is desirable that the longitudinal axis of the drive shaft be on the same plane passing through the axis of the drive shaft.

According to this configuration, all arms aligned on the same axis simultaneously reach their operating limit positions. This ensures simultaneous operations that reach .

With this structure, all the mechanisms of the tennis practice machine can be placed in their working position at the same time before firing. is maintained, thus increasing the reliability of the operation of the program control device for the tennis practice machine. let

Preferably, means are provided for interrupting rotation of the drive shaft, said means comprising a limit switch. It consists of a switch and a protrusion that cooperates with the limit switch, and the number of protrusions is It is equal to the number of rollers in the mechanism of the varnish training machine, and the protrusion is at the maximum operating position of the arm. mounted on the drive shaft to activate a limit switch when the limit switch is reached.

Operating position of the roller and arm where the arm is at the operating limit position farthest from the axis of the drive shaft In this case, the drive shaft is stopped by providing a means for interrupting the rotation of the drive shaft. This allows customers to easily and quickly perform reprogramming while keeping the program in place. what Therefore, a disk with radial guides and rollers will help the ball move from the tennis practice machine. The arm indicates the position of the arm at the moment of firing, that is, the program setting value when adjusting the roller. This is because it automatically stops at the indicated position.

Therefore, the program control device for a tennis practice machine according to the present invention can be used to control the mechanism of a tennis practice machine. This allows various operating programs to be quickly set. According to this device , to easily program tennis practice machines to simulate various complex match situations. This is possible.

Especially when coaches and players recalibrate their tennis practice machines with creative intentions in mind. What is important is that you can easily create a desired program.

The program control device for a tennis practice machine according to the present invention has a simple configuration and It has the advantages of high operational reliability, low cost, and easy operation. Ru.

Brief description of the drawing EMBODIMENT OF THE INVENTION Hereinafter, the present invention will be described in detail based on embodiments, specific examples of which are shown in the accompanying drawings. In addition : FIG. 1 is a schematic diagram of a program control device for a tennis practice machine according to the present invention, in which the end plate Figure 2 is a schematic diagram of the same device with arrow A removed to clarify the structure. View from above (springs not shown for clarity), FIG. An enlarged cross-sectional view along mg, concave showing the cross-section of one disk (the shaft and arms are clearly marked). Not shown. ), FIG. 4 is a schematic illustration of a rotation interrupting device for a drive shaft.

BEST MODE FOR CARRYING OUT THE INVENTION The program control device for a tennis practice machine of the present invention shown in FIG. ) is removed and the case 1 is shown in a front view. and inside this case accommodates a horizontally extending drive shaft 3 (Figs. 1 and 2).

Case 1 (Figure 1) has four corners fixed with stands 4a (Figures 1 and 2). It consists of a plate 2 (FIG. 2) and an end plate 4.

The shaft 3 is attached to the end plates 2 and 4, and attached to the end plate 4 by any suitable known method. The drive unit 5 is operatively coupled to a drive unit 5.

In the present example, this drive device consists of an electric motor, which also has the reference numeral 5 and is equipped with a speed control device of any suitable known type.

The electric motor 5 is arranged at a position away from the axis of symmetry perpendicular to the case 1 as shown in Fig. 1. has been done.

The electric motor 5 includes a pinion 6 (see FIGS. 1 and 2) attached to a shaft 5a and a shaft 3. Rotation is transmitted to the shaft 3 via a gear 7 mounted above.

The same number of discs 8 as the controlled mechanisms of the tennis practice machine are firmly fixed to the shaft 3. There is. Each disk 8 is hollow and has a pair of end plates 9,10 (FIG. 3). this disc 8 has a radial guide 11 (FIGS. 1 and 2) consisting of a radial groove 11. However, these grooves #4 are provided in the end plate 10 (FIG. 3).

A program member 12 (FIGS. 1, 2, and 3) is received in the radial groove 11. It has the shape of a roller 12.

The aperture 12 is mounted so that its movement along the radial groove 11 can be adjusted. and can be held in the adjusted position within the groove. The roller 12 is a tennis player. An arm 13 (FIG. 1) operably connected to its respective mechanism for controlling the trainer aircraft , Fig. 2).

The arm-controlled mechanism of the tennis practice machine moves the entire tennis practice machine along the horizontal and vertical axes. It may be a type that rotates around a direct axis, or it may be used as a shaft drive part of a tennis practice machine, or In a pneumatic tennis practice machine, it is a pressure reducing valve that changes the ball launch speed. It can also be a device that gives spin to the ball, or another mechanism of a tennis practice machine. Also good.

All arms 13 are arranged parallel to the axis 3 and have a pivot axis 1 fixed to the end plates 2, 4. 4 (Fig. 1.2). Each arm has a free end 1 of said arm 13. The cable 15 attached to the tennis practice machine 7 via the link 16 Each is connected to a corresponding mechanism.

The arm 13 has a portion attached to the pivot shaft 14 that pushes the arm downward in FIG. It has a compressing spring 18.

The position of the roller 12 in all is adjusted using screws and nuts provided in the space inside the disc 8. The nut 20 on each pair is a pivot It is connected to the roller 12 by a bin 21.

The roller 12 is fitted on the small diameter side of a stepped pivot bin 21. or, Each pivot bin 21 is fixed to a respective nut.

The screw 22 of the pair 19 is adjusted by rotating the screw 22 by the program control device. For this purpose, the portion protruding from the disk 8 has a polygonal head.

The screw 22 has a receiving surface 24 that is pressed against the unfinished inner peripheral surface of the disk 8. are doing.

The number of radial guides 11 on each disk 8 is 5, 3, which means the rollers 12 fitted therein. The number of commands for the controlled mechanism of the tennis practice machine is six.

The pair 19 is designed to have self-retaining properties, and the roller 12 is placed in the groove 11. held in place. The lead angle of the screw 22 is determined by the friction between the napht 20 and the screw 22. This is because it is smaller than the angle.

As shown in FIG. 2, in the program control device according to the present invention, five circles A board 8 (one for each controlled mechanism of the tennis practice machine) is attached to the shaft 3. Ru.

There is enough space between the adjacent discs 8 for the arm 13 and the roller 12 to move freely. A gap of the same size is provided.

The distance between the lower side and the upper side of each arm 13 in FIG. 1 is the length of the arm 13. They are configured differently along the directions. The maximum distance is on the center line of axis 3. The minimum distance is near where the distal end 17 of the arm is connected to the cable 15.

- This distance is the distance between one rotor on each disk 8 when the arm 13 reaches its operating limit position. The shape changes along the longitudinal direction of the arm 13 so that it comes into contact with the roller 12.

Each disk has the same number of radial grooves 11. Corresponding to each on all disks The longitudinal centerline of the radial groove 11 is located. The device 25 may be of any suitable known type. It includes a limit switch 26 (FIGS. 2 and 4) and a button 27. limit lift The switch 26 has one normally closed contact 28 and one normally open contact 29. Contact 2 A toggle switch in parallel with contact 28 to bypass it if 8 is open. A switch 30 (FIG. 4) is connected.

The device 25 is a button 2 of a limit switch 26 mounted on the end plate 4 (FIG. 2). It has a protrusion 32 designed to cooperate with 7. The protrusion 32 is fixed to the shaft 3. The gears 70 are arranged at equal intervals on the circumference and at equal distances from the shaft 3.

The number of projections 32 is equal to the number of rollers 12 on each disk 8. Also, adjacent protrusions The central angle formed by the rollers 32 is equal to the central angle formed by the corresponding rollers 12. It is arranged so that This arrangement of the protrusions 32 allows the protrusions to fit on the tennis practice machine. The operating limit position of the arm 13 of the controlled mechanism corresponding to the position at the moment the ball is launched. This will activate the limit switch.

Normally open contacts 29 ensure that all controlled mechanisms of the tennis practice machine are in the programmed direction. By closing the contact point 29 after the ball is placed in a position where it will be fired. , designed to operate a tennis practice machine launcher (not shown here) has been done.

A switch 33 is provided on the wiring 34 to control the program for the tennis practice machine. The tennis practice machine's launcher can now be activated one time at a time while the device is being adjusted. Additionally, the normally open contact can be disconnected from the wiring 34.

This allows test firing by turning on switch 33 while readjusting the program. It is necessary to do so.

The program control device for a tennis practice machine according to the present invention operates as shown below.

The cable 15 is connected to a controlled mechanism of a tennis practice machine installed on a tennis court. It will be done. Then, the program is executed by turning on the toggle switch 30 and power supply 31. be done. The electric motor 5 starts rotating the shaft 3 via the pinion 6 and the gear 7. Low The player 12 moves the arm 13 with the cable 15 and moves the corresponding part of the tennis practice machine. actuates a mechanism in which each arm 13 is engaged by a corresponding roller 12. This continues until the operating limit position determined by the position of the roller 12 is reached.

On the other hand, one of the six protrusions 32 on the gear 7 is connected to the button of the limit switch 26. reaches button 27 and presses button 27.

The normally closed contact 28 is opened and the supply of power from the power source 31 to the motor 5 is interrupted. electric The motive 5, the disk 8 and the roller 12, the cable 15 and the cable 15 are connected to each other. The mechanism of the tennis practice machine also stops. At this point, all controlled mechanisms of the tennis practice machine are It is located in one of six main positions.

The contact 28 opens and the motor 5 stops, and at the same time the contact 29 closes and the motor is turned off in a well-known manner. Activate launcher R (not shown here) of the Varnish trainer. and the ball is fired from a tennis practice plane and lands at a certain point on the tennis court.

If you need to change the ball's falling point, ball speed, rotation or launch speed, , the cable 15 and associated tennis practice machine mechanism are connected to the naphto 20 and the arm 13. Adjust by rotating the screw 22 so that the roller 12 that engages the Ru.

After moving the roller 12, connect the switch 33 for 0.1 to 0.5 seconds. This allows for test firing. If the trajectory and other factors of the ball's flight are If it is satisfactory for the Connect between. The protrusion 32 is removed from the button 27, the contact 28 is closed, and the motor 5 is Rotate the shaft with the disc 80-ra 12 again until the protrusion 32 presses the button 27. let

When the electric motor 5 stops as described above, the controlled mechanism of the tennis practice machine It corresponds to the position of the arm 13 determined by the next roller 12 that came to It's in position.

As a result, the ball is fired from the tennis practice machine and falls to a different point on the court. become.

If necessary, use other methods to change elements of ball flight as described above. Turn the screw 22 to move the other roller 12 to the other main position of the tennis practice machine and try it out. can shoot.

The program control device for the tennis practice machine has six operating positions of the roller 12 and the arm 13. Adjust everything as described above.

The number of main positions of rollers 12 and arms 13 is equal to the number of rollers 12 on one disk 8. equal.

As mentioned above, adjust the program operation of the program control device for tennis practice machine After that, toggle switches 30 and 33 are connected. This causes contact 28 to be bypassed. The drive shaft 3 and disc 8 do not stop even when the protrusion 32 presses the button 27, and the motor 5 rotates the disk 8 and roller 12 continuously. Controls the launcher of a tennis practice machine The contact 29 closes each time the protrusion 32 presses the button 27 while the gear 7 is rotating. , six times during one revolution of the disc 8 of the device for controlling the tennis practice machine (not shown). The ball is fired. Then, each firing motion is performed with a predetermined ball as described above. takes place with flying elements. This allows for complex trials consisting of six different batting conditions. This makes it possible to simulate the situation where the The roller 12 is located in the radial direction of the disk 8. Since it can be held in any part of the tennis practice machine, you can change the hitting program from the tennis practice machine almost infinitely. This makes it possible to incorporate the creativity of coaches and players to the fullest.

This makes it difficult for even the most mundane match situations and even highly skilled tennis players. Both complex game situations can be simulated.

A test machine for the program control device for tennis practice machines has been manufactured and is used for training tennis players. It was a success.

As a result of testing, the program control device for a tennis practice machine according to the present invention was found to be suitable for a tennis practice machine. It has been demonstrated that the ball can be launched according to a predetermined program.

The structural hour wheel of this program control device for tennis practice machines, ease of adjustment, and low cost. Depending on the situation, it may be possible to carry such a program control device in the trunk of a car. Can be used for both portable tennis practice machines and fixed tennis practice machines becomes.

This program control device is used in many existing models of tennis practice machines, and or as a separate product for use in other types of practice machines for discus games You can also do that.

Industrial applicability The program control device according to the present invention can be used in mechanical and pneumatic tennis practice machines. can be used most advantageously.

Further, the program control device for a tennis practice machine according to the present invention can be used for ball and disc games. It can also be used in other sports training machines for practice.

international search report m-lAl-piece”’kPCT/SO86100087

Claims (4)

[Claims] 1. operatively coupled to each mechanism to control the various mechanisms of the tennis practice machine. a radially extending arm (13) for receiving a programming member (12) engaged with the arm (13); Teeth with a drive shaft (3) with a disc (8) with a formed guide (11) In the program control device for a varnish trainer, the program member (12) has a radius It is possible to adjust the movement along the direction guide (11) and also to hold it in the adjusted position. For a tennis practice machine, characterized in that it has the shape of a roller attached to Program control device. 2. The program control device according to claim 1, wherein the guide (11 ) is mounted in the disc (8) to adjust the movement of the roller (12) along the It is formed by a pair (19) of the same and a nut, and the nuts (20) of the pair are each said roller (12), and said roller (12) with respect to the nut (20). Rotatably coupled, the screw (22) has a head (2) protruding from the disk (8). 3) A program control device for a tennis practice machine. 3. In the program control device according to claim 1, the whole disk (8) is each pair having the same number of said radial guides (11) on all said disks (8). The longitudinal axis of the corresponding radial guide (11) is aligned with the drive shaft ( 3) A tennis player characterized by being provided on the same plane passing through the axis of Program control device for training aircraft. 4. The program control device according to claim 1, wherein a limit switch ( 26) and a protrusion (32) cooperating therewith. steps (25) are provided, and the number of said protrusions (32) is equal to the number of said projections (32) of said tennis practice machine. Equal to the number of rollers (12) corresponding to the mechanism, said projections (32) are connected to said drive shaft (3). ), when the arm (13) reaches the operating limit position, the limit switch (26) ) for a tennis practice machine, characterized in that it is attached to operate the gram control device.