JPS6122591B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic ball throwing device for a tennis practice machine or the like that can fire a ball while rotating a firing tube left and right.

This type of automatic ball throwing device generally fires the ball by distributing the firing tube to the left/right end, left/center, right, etc., but it is important to ensure that the above function is not lost even if the swing amplitude of left/right firing is changed. etc. are desired.

Conventional tennis practice machines of this type have a device that determines whether to launch the ball from the right, center, or left position by blocking the four holes on the rotary disc. The disadvantage is that the way the holes are plugged is complicated and it takes time to change. Furthermore, since the left/right rotation of the launch tube and the rotation of the rotary disk are synchronized by a mechanical method, it is not possible to stop the left/right rotation at an arbitrary position. Furthermore, since there is a transport distance from the time the ball enters the hole in the rotary disk until the ball is fired, there are drawbacks such as unstable and variable transport time and inaccurate synchronization between left and right rotation and ball firing.

In view of the above-mentioned drawbacks of the conventional example, the present invention can easily switch so that the ball can be fired at the left and right ends (limits) or at the left and right ends and the center when the launch tube turns left and right. To obtain an automatic ball throwing device which has a simple structure capable of fixing the launcher at any left or right turning position and continuing to shoot the ball, and is less likely to malfunction.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 to 5, reference numeral 1 denotes a bearing fixed to the device fixing part 2. In the embodiment shown in FIGS. Reference numeral 3 denotes a support plate protruding from the bearing 1 toward the outer periphery. 4 includes a thrust bearing 5 and a bearing metal 6 in the bearing 1;
6 is a swivel base rotatably supported on a shaft. Reference numeral 7 denotes a motor fixed to the support plate 3 as a driving section. Reference numeral 8 denotes a link mechanism for rotating the left/right swivel table 4 left/right, and this link mechanism 8 has a plate shape as shown in FIG. a first link 10, and a second link 13 whose one end is pivotally supported to the first link 10 by a pin 11 and the other end is pivotally supported to the swivel base 4 by a pin 12. It is configured. Reference numeral 14 denotes a launcher main body fixed to the swivel base 4, and the launcher main body 14 is fixed to a support 15 fixed to the swivel base 4 and to the support 15 with a plurality of bolts 16. A firing part body frame 17 and a firing tube 18 attached to this firing part body frame 17
and the upper and lower firing section body frames 17 of this firing tube 18.
Upper and lower drive motors 19, 20 fixedly attached to
and the wheel escape parts 24, 2 of the firing barrel 18 which are fixed to the drive shafts 21, 22 of the upper and lower drive motors 19, 20 by set screws 23, 23.
a pair of firing wheels 26, 27 whose tips are located at 4 and which fire the ball 25 from within the firing tube 18;
and a ball supply device 30 that drops the balls 25 aligned in advance into the launch barrel 18 from the ball inlet 28 of the launch barrel 18 via a hose 29.
Then, the tip part that pushes the balls 25 that have fallen into the launch tube 18 from the ball inlet 28 one by one between the pair of launch wheels 26 and 27 enters the launch tube 18 from the cut-out blade escape 31 of the launch tube 18. A plurality of blades 3 are placed at intervals where one ball 25 can fit.
2, and a drive shaft 35 is fixed to the bearing part of the cutting blade 33 by a set screw 34. It is composed of a cutting motor 37. 38 detects the position of the link of the link mechanism 8 and removes the cutting blade 3.
This actuating device 38 detects the position of the first link 10 of the link mechanism 8 attached to the tip of the support plate 3 and activates the cutting motor 37. and a detection switch 40 that detects the position of the blade 32 of the cutting blade 33 attached to the tip of the mounting plate 36 and controls so that only one ball is cut out. ing.

In the above configuration, the rotation of the motor 7 causes the swivel base 4 to rotate left and right. Therefore, the firing section main body 14 also rotates to the left and right. At this time, the first link 10 of the link mechanism 8 is detected by the detection switch 39 at the location where the swivel base 4, that is, the launcher main body 14 is located at the left end. Upon detection by the detection switch 39, the cutting motor 37 is driven, and the cutting blade 33 pushes only one ball 25 that has fallen into the firing tube 18 into between the firing wheels 26 and 27.

As a result, the ball 25 is fired by the high speed rotation of the pair of firing wheels 26 and 27. In addition,
The detection switch 40 stops the cutting motor 37 so that the cutting blade 33 sends only one ball. Next, when the firing section body 14 is located at the right end, the first link 10 of the link mechanism 8 is detected by the detection switch 39, and the cutting motor 37 is driven to move the ball 25 into the firing barrel 18 in the same manner as described above.
Fires from inside.

Next, different embodiments of the first link of the link mechanism 8 will be explained using FIGS. 6 and 7.

The embodiment shown in FIG. 6 has the first link 10A formed in a T-shape, and with this configuration, three balls can be fired during one rotation of the first link 10A. The firing position is left → right → middle → left →
Can be fired sequentially from right to middle position.

The embodiment shown in FIG. 7 has the first link 10B shaped like a cross, and with this configuration, four balls can be fired during one rotation of the first link 10B. The firing position is left → middle → right →
Can be fired in sequence from center → left → middle position.

As is clear from the above description, the present invention has the following effects.

(1) Equipped with an actuation device that rotates the launcher to the left and right via a link mechanism, detects the position of the link mechanism, and operates the cut-out blade so that only one ball can be fired. The ball can be reliably fired from the left and right extreme positions.

(2) Simple structure and less chance of failure.

(3) By simply replacing the first link of the link mechanism with a plate-shaped, T-shaped, or cross-shaped one, the ball launch position can be changed, and this operation can be done easily.

(4) The actuator can also stop the link mechanism and drive only the cutting blades, so it is also possible to stop the launcher at any position and fire the balls continuously at that position.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing one embodiment of the present invention;
FIG. 2 is a plan view of FIG. 1, FIGS. 3 and 4 are explanatory diagrams of the firing section, and FIGS. 5, 6, and 7 are diagrams showing links. 1: Bearing, 2: Device fixing part, 3: Support plate, 4:
Swivel base, 5: Thrust bearing, 6: Bearing metal,
7: Motor as a drive unit, 8: Link mechanism,
9: Drive shaft, 10, 10A, 10B: First link, 11: Pin, 12: Pin, 13: Second ring, 14: Launcher main body, 15: Support, 16: Bolt, 17: Launcher Body frame, 18: Launch tube, 19:
Upper drive motor, 20: Lower drive motor, 2
1: Drive shaft, 22: Drive shaft, 23: Set screw, 2
4: Wheel escape part, 25: Ball, 26,2
7: Launch wheel, 28: Ball inlet, 29: Hose, 30: Ball supply device, 31: Cutting blade relief, 32: Blade, 33: Cutting blade, 34: Set screw, 35: Drive shaft, 36: Mounting plate, 37: Cutting motor, 38: Actuating device, 39: Detection switch, 40: Detection switch.

Claims (1)

[Claims] 1 A bearing fixed to a device fixing part, a support plate protruding from this bearing, a drive part attached to this support plate, a swivel base rotatably attached to the bearing, and this swivel base. a link mechanism for rotating left and right, one of which is pivotally supported on the swivel base and the other connected to the drive unit; a firing unit body fixed to the swivel base; and a firing unit attached to the firing unit body. a cylinder, a ball supply device that drops balls aligned in advance into the firing cylinder from a ball inlet of the firing cylinder, and a ball feeding device that fires the balls from within the firing cylinder arranged such that the tips thereof face each other within the firing cylinder. a pair of firing wheels; a rotatable cut-out blade having a plurality of blades arranged at intervals that allow one ball to push the balls that have fallen into the firing tube from the ball inlet one by one between the firing wheels; and the link. An automatic ball throwing device comprising: an actuating device that detects the position of the mechanism and operates the cutting blade to shoot only one ball.