JPS639871B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ball distribution control device for a table tennis practice machine that continuously shoots table tennis balls.

Various structures have been proposed for table tennis practice machines that eject table tennis balls continuously. A table tennis practice machine that ejects a ball in the same state is commonly used. However, with this practice machine, the ball speed and delivery position are always the same, so it is effective for basic practice for beginners by learning the form, etc.
There were some problems that made it impossible to use it effectively in footwork practice for intermediate and advanced players and random practice for actual combat.

Therefore, in consideration of the above points, the present invention allows complicated pitches such as short shots and long backs to be performed continuously, and provides effective practice for intermediate and advanced players. The purpose of the present invention is to provide a ball distribution control device for a table tennis practice machine that can perform the following functions.

To this end, the present invention provides a set input circuit that has a plurality of pitch setting switches and encodes and outputs pitch information according to the operation of the set switches, and encoded pitch information outputted from the set input circuit. a memory circuit that sequentially stores the information, a disconnection circuit that switches the memory circuit between a write state and a read state, and a ball distribution sequentially from the memory circuit in synchronization with the ball ejection operation when the switching circuit is switched to the read state. The present invention includes an output circuit that reads the encoded information and outputs a control signal based on the information to the speed control circuit of the injection motor and the control circuit of the oscillating device.

The present invention will be explained below based on the drawings. Fig. 1 shows a longitudinal cross-sectional view of a table tennis practice machine, which consists of a hopper 1 into which table tennis balls are placed, and a hopper 1.
An L-shaped tube 2 connected to the bottom of the hopper and with an injection cylinder 3 horizontally attached to the lower end, a descending control mechanism 4 that controls the descent of the ball from the hopper 1, and a ball waiting at the bottom of the L-shaped tube 2. It is composed of a striking mechanism 5 that applies a strike and generates a striking sound, and a swinging device 6 provided on a base 7. An upper slit 8, a central slit 9, and a lower slit 10 are provided on a part of the outer periphery of the L-shaped tube 2 from above at approximately ball intervals. 2 control plate 12 is inserted into the central slit 9, and furthermore, the striking arm 13 of the striking mechanism 5 is configured to be insertable into the lower slit 10. First control board 11
and the second control board 12 is a rotary shaft 1 erected on the base 7.
The lower end of the rotary shaft 14 is connected to the tip of a main shaft 15a of a motor 15 with a reduction gear fixed to the lower part of the base 7. As shown in FIG. 3, the first control plate 11 is formed with a notch 11a that allows the ball inside the L-shaped tube 2 to drop downward at a certain timing synchronized with the rotation of the first control plate 11, while the second control plate 12 is A notch 12a is also formed which also serves as a cam surface, allowing the balls to fall one by one to a lower hitting position at a predetermined timing. A cam roller 16 mounted on the other end of a striking arm 13 rotatably supported as a striking mechanism 5 is biased by a coil spring 17 on a cam surface formed on the outer periphery of the second control plate 12. contact in a closed position. Therefore, 1 of the second control board 12
With each rotation, the ball falls to a fixed position at the bottom of the L-shaped tube 2 through the notch 12a, and each time the notch 12a reaches the cam roller 16, the striking arm 13 rapidly pivots toward the lower slit 10 at a predetermined timing. hit the ball. Reference numeral 18 denotes a rubber injection roller which is partially inserted into the opening 3a provided on one side of the injection cylinder 3, and is directly connected to the rotating shaft of the injection motor 19, and rotates at high speed. , injects the ball that has advanced into the injection tube 3 due to the impact. 3
Reference numeral 5 denotes a limit switch disposed in contact with the outer periphery of the second control plate 12, and is provided for generating a synchronizing signal during injection.

FIG. 2 shows an enlarged plan view of the oscillating device 6, and the structure of the oscillating device 6 will be explained using this.A small gear 20 is slidably and loosely fitted onto the main shaft 15a of the motor 15 protruding from the base 7. On the upper surface of this small gear 20, there is a rotating shaft 1 connected to the tip of the main shaft 15a.
Cam portion 20a that engages with the cam portion provided at the lower end of 4.
is installed protrudingly. 21 is a leaf spring mounted on the base 7 to urge the pinion 20 upward; 22 is a solenoid that operates to press the pinion 20 downward; the operation of the solenoid 22 causes the pinion 2 to
When motor 0 is pressed downward, motor 1
The rotational force of the pinion 20 is not transmitted to the pinion 20, and when the solenoid 22 is not in operation, the cam part 20a of the pinion 20 and the cam part of the rotating shaft 14 engage with each other due to the biasing force of the leaf spring 21, and the motor 15 The rotational force of the rotating shaft 14
The clutch mechanism 34 is transmitted to the small gear 20 through the sliding movement of the small gear 20. 23
is a large gear supported on the base 7 so as to mesh with the small gear 20, and is engaged with a claw 24 for preventing reverse rotation so that it rotates only in the direction of the arrow. Reference numeral 25 denotes a swinging arm that is pivotally supported on the base 7, and has an arcuate long hole 2 in the middle part.
A link 26 is connected to the tip of the swing arm 25, and the other end of the link 26 is connected to an eccentric position of the large gear 23. A support shaft 27 rotatably supports the base 7, and the lower part thereof is fixed to a stand and serves as a rotational fulcrum for the swinging device 6.
A swinging arm 28 is fixed to the tip of the support shaft 27, and a link 29 connects the tip of the swinging arm 28 and the elongated hole 25a of the swinging arm 25 pivotally supported on the base 7. , the link 29 is the elongated hole 25
A handle 31 for adjusting the swing angle is connected via a link 30 to the lower side of the pin 29a that engages with the pin 29a.

FIG. 4 shows a block diagram of the ball distribution control device. 51 is, for example, four pitch setting switches RS.
(right shot), RL (right long), LS (left shot), and LL (left long), and is a set input circuit that generates pitching information according to the operation of these switches. When distributing a ball to the short position, turn on the pitch set switch RS, then when distributing the ball to the left long position, turn on the pitch set switch LL. Operate the switches in order of pitch delivery and code the pitch information. Convert memory circuit 5
2 will be memorized in sequence. Since the memory circuit 52 sequentially writes and reads out pitching information, it can be easily configured with a shift register and flip-flops for reading and writing.For example, if there are four types of pitching data, two shift registers are enough for table tennis practice. It is possible to store a sufficient amount of pitching information necessary for 53 is a clock circuit that generates a clock signal used for writing and reading data to and from the memory circuit 52, and sends the clock signal to the memory circuit 52 when a set input signal from the set input circuit 51 and a synchronization signal to be described later are input. . Reference numeral 54 designates a synchronization signal input circuit which inputs a signal when the limit switch 35 is turned on when a ball is ejected as a synchronization signal, and transmits a reading clock signal synchronized with the synchronization signal from the clock signal 53 to the storage circuit 52 in the read state. output and read the next pitching data from the shift register. Reference numeral 55 denotes a switching circuit equipped with a changeover switch 36, which is used to write pitch data to the memory circuit 52 when setting the pitch, and to start the table tennis practice machine, read the pitch data from the memory circuit 52, and change the ball according to the pitch data. The play time for ejecting is switched, and a corresponding switching signal is output to the clock circuit 53 and the memory circuit 52. 56 is an output circuit that outputs the short and long pitch data output from the memory circuit 52, and 57 is an output circuit that also outputs the left and right pitch data, and outputs the on/off output of the relay according to the pitch data. configured to do so. Reference numeral 58 denotes a speed control circuit for the injection motor 19, which is configured so that two types of speed, high and low, can be set arbitrarily by operating a dial, etc., and the high and low speeds are switched and controlled by opening and closing the relay contacts of the output circuit 56. The motor rotation speed at a high speed position is set so that the ball falls to the tip of the table tennis table, resulting in a long ball delivery, and the motor rotation speed at a low speed position is set so that the ball falls toward the net, resulting in a short ball delivery. , two types of speeds are set in advance. On the other hand, 59 is a control circuit that controls the direction of swinging, that is, the direction of ball distribution, and is connected to the solenoid 22 of swinging device 6.
is configured to be turned on and off by opening and closing of the relay contacts of the output circuit 57 to set the injection direction to the left or right, and furthermore, the rotational speed of the motor 15 for swinging and supplying the ball to the injection position can be set arbitrarily. A dial-type speed regulator is provided, and by adjusting the speed of this motor 15, the time interval of ejected balls, that is, the pitch interval can be arbitrarily set.

Next, the operation of the ball distribution control device will be explained.

First, before practicing table tennis, each part of the practice machine is set up according to the practice level. Changeover switch 3
6 to the set side, turn on the ball distribution set switches RS and LS of the left and right shots several times each, and change the changeover switch 36 to the play side. Next, the table tennis practice machine is started with the swing angle adjustment handle 31 set to the zero swing angle position, and the balls 40 are continuously ejected. At this time, the low rotational speed of the speed control circuit 58 of the injection motor is adjusted by looking at the distribution state of the ball 40 to obtain an appropriate shot distribution, and the motor speed of the swing control circuit 59 is adjusted. and adjust the injection time interval to an appropriate time. Next, change the changeover switch 36 to the set side again, turn on the left and right long ball distribution set switches RL and LL several times each, change the changeover switch 36 to the play side, and perform the same operation as above again. The high speed rotation speed of the injection motor speed control circuit 58 is adjusted so that the falling position of the long ball is at the tip of the table tennis table. Then, after operating the swing angle adjustment handle 31 to set the swing angle of the swing device 6 to an appropriate value, the changeover switch 36 is again turned to the set side, and at this point, the setting for the actual practice is set. Set up a continuous pattern of balls. That is, for example, if you press the pitch setting switch in the order of RS, RL, LS, LL,
The pitch of the ejected ball 40 is first a forward shot, a forward long shot, then a back shot, and a back long shot, and this sequence is repeated.

The setting is completed in this state, and the changeover switch 36
Put it on the play side and start the actual practice. When the table tennis practice machine is started, the first ball distribution information, for example, the right shot ball distribution, is read out from the memory circuit 52, the output circuit 56 sets the speed control circuit of the injection motor to a low speed, and the output circuit 57 sets the speed control circuit of the injection motor to a low speed. The control circuit 59 is set so that the injection direction is to the right, and the injection motor 19 and swing motor 15 are operated to eject the ball as follows.

The balls 40 entering the L-shaped tube 2 from the hopper 1 are temporarily stopped by the rotating first control plate 11, and at the timing when the notch 11a enters the L-shaped tube 2, one ball 40 is moved to the second control plate 11. It falls onto board 12. Furthermore, the notch 1 of the rotating second control plate 12
At the timing when 2a enters the L-shaped tube 2, the ball 40
As soon as the cam roller 16 of the striking arm 13 enters the notch 12a, the striking arm 1 is moved by the biasing force of the coil spring 17.
3 makes a sudden turn and hits the ball 40 in the lower slit 10.
inflict a blow on. Then, the ball 40 is ejected into the injection tube 3 with the generation of a hitting sound, and the ball 40 is ejected by the injection roller 18 rotating at a predetermined speed, and the ball 40 is moved in the direction of the injection tube 3 by the swinging device 6. The ball is delivered to the right shooting position.

Here, to explain the operation of the swinging device 6, the large gear 23 of the swinging device 6 follows the small gear 20 and rotates at 1/2 the speed of the small gear 20, and the link 26 performs a crank motion. The swinging arm 25 swings around a shaft fixed to the base 7, and this swinging motion is transmitted to the swinging arm 28 fixed to the support shaft 27 through the link 29. At this time, the support shaft 27 is completely fixed to a stand (not shown) and cannot be rotated, so if the swing arm 28 receives a force to rotate counterclockwise through the link 29 in FIG. , the reaction is transmitted to the base 7, and the base 7 rotates clockwise around the support shaft 27, while the force that rotates the swinging arm 28 clockwise is transmitted to the link 29.
, the base 7 rotates counterclockwise around the support shaft 27 . In this way, the base 7 reciprocates with respect to the support shaft 27, and when the tip of the link 26 reaches the upper end of the large gear 23 (in FIG. 2) and reaches the lower end of the large gear 23, A swing is made within the range.

The turning point at which the direction of swing of the base 7, that is, the entire injection device changes, is detected by two limit switches 32, 33 that detect the upper and lower ends of the link 26;
When detects the turning point of oscillation, solenoid 2
2 is energized to push down the pinion 20, and the cam portion 20a of the pinion 20 disengages from the cam portion of the rotating shaft 14, causing the clutch mechanism 34 to disengage.
When the small gear 20 stops rotating, the swinging motion is temporarily stopped. The second control plate 12 continues to rotate even during this swing suspension, and the notch 12a of the second control plate 12 is connected to the cam roller 16 of the striking arm 13.
When the striking arm 13 reaches the position shown in FIG. , rotating injection roller 18
It is immediately ejected by.

Therefore, when the command to deliver the ball to the right or to the left continues, the solenoid 22 continues to be energized, the swinging is stopped with the injection tube pointing in the specified direction, and the shot or long shot is delivered at a predetermined period. The ball is fired.

As explained above, the pitch distribution control device of the present invention is provided with a set input circuit that encodes and outputs pitch information from a pitch set switch, and a storage circuit that sequentially stores the coded information of the pitch distribution. Because of this provision, ball distributions can be continuously memorized in various patterns by a simple operation of turning on the ball distribution set switch one after another. Also,
Based on the coded information of the pitched ball read from the memory circuit, the speed control circuit of the injection motor and the control circuit of the swinging device are controlled, and the ejection direction and flight distance of the ball are sequentially controlled. Continuously perform complicated pitches such as long and long backs,
It is also possible to conduct effective practice for intermediate and advanced players.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the main parts of the table tennis practice machine, Fig. 2 is an enlarged plan view of the swinging mechanism, and Fig. 3 is a sectional view taken along line A-A in Fig. 1. FIG. 4 is a block diagram of the ball distribution control device. 6... Swing device, 19... Injection motor, 51
...Set input circuit, 52...Memory circuit, 55...
...Switching circuit, 56, 57...Output circuit, 58...
Speed control circuit, 59... Swing control circuit, RS,
RL, LS, LL...Pitch setting switch.

Claims (1)

[Claims] 1. A table tennis practice machine equipped with an injection motor that drives an injection roller for ejecting balls and a swinging device that horizontally reciprocates the injection device body, which has a plurality of pitch setting switches that can input pitch information,
a set input circuit that encodes and outputs pitch information from the pitch set switch; a memory circuit that receives the output from the set input circuit and sequentially stores coded information on pitch distribution; A switching circuit for switching between a writing state and a reading state, and upon receiving a signal indicating that the switching circuit has been switched to a reading state, encoding a ball distribution from the memory circuit in synchronization with a ball ejection operation. A ball distribution control device for a table tennis practice machine, comprising an output circuit that sequentially receives information and outputs a control signal based on the information to a speed control circuit of the injection motor and a control circuit of the swing device.