DE7246876U - Device for ejecting tennis balls - Google Patents

Description

Device for throwing tennis balls

The invention relates to a device for ejecting tennis balls that are stored in a magazine and be fed at intervals to an ejection mechanism consisting of two counter-rotating disks, between which the ball to be thrown is detected, accelerated as a result of the peripheral speed of the discs and is ejected according to a certain guide path.

In a known device of the type mentioned (US Pat. No. 2,918,915), the two disks are mounted on a common carrier and both disks are via a belt drive from a common motor set in rotation. Both disks have the same peripheral speed. The balls to be thrown out are caught by the lower disc,

over a circumferential path of about 180

from the lower - 2 -

6251/01 / Ch / sr - 2 -. December 21, 1972

Disc taken along, with the balls in the last part of the guide path in the gap between the two Disks arrive and from there with an approximately corresponding to the circumferential speed of the disks Speed can be ejected. It is possible to adjust the ejection angle by tilting it accordingly of the carrier carrying the two disks, with the axis of the lower disk as the pivot axis is provided.

This known device has some major drawbacks. Due to the long path of the balls between the lower rotating disc and a guide plate, the balls are subject to severe wear. Furthermore, the balls are ejected with quite different ejection speeds, what is due to the different diameter of the balls. The ejection speed is further influenced due to the elasticity of the balls. Another disadvantage is that the balls thrown out have no twist have, which is due to the same circumferential speed at beia η disks. Another flaw it can be seen that to change the ejection angle, the disc carrier must be swiveled manually, however, it is only possible to change the ejection angle in the plane of the disk, but not across it is. If the ejection angle is also to be changed across the plane of the disc, the entire device must be adjusted accordingly be moved.

The object of the invention is to provide a device for ejecting tennis balls in which the ejection speed the ball is unaffected by the

6251/01 / Ch / sr - 3 - December 21, 1972

knife of the ball to be thrown. Furthermore, there is the task that the balls each over only can be accelerated by a small guideway from the disks.

As a solution to this, it is proposed according to the invention in a device of the type mentioned that the two disks are elastically clamped against each other in the disk plane and the balls the gap between the Slices are fed directly to the side opposite the ejection side.

This arrangement ensures that balls of different diameters are always the same Pressure from the disks can be detected, the guide path is relatively small and this guide path for all Ball diameter is practically constant.

·> In an advantageous manner, each disc is provided with its own drive motor that can be set to different speeds, so that the bales can be twisted when they are ejected through different circumferential speeds. In addition, the selected construction enables the ejection angle to be easily adjusted both in the vertical and in the horizontal direction.

An embodiment of the device according to the invention is shown in the drawings. Show it:

FIG. 1 is a side view and FIG. 2 is an end view.

62 ^ 1/01 / Ch / sr - 4 - December 21, 1972 ^

^T n a housing 1 is arranged a turntable 2, which we set in slow rotation via a Ko'or 3. As a result, the tennis balls stored in Hagazin A fall periodically into the guide tube 5. Due to their own weight, the balls fall down in the flexible tube 5, are caught by the disks 6, 7 and carried along into the gap between the two disks 6, 7 , there accelerated to the peripheral speed of the disks 6, 7 and then ejected forward.

The drive motor 8 of the disk 6 is mounted on a carrier 9. This carrier 9 is via a hinge 10 connected to a carrier 11, which in turn supports the disk 7 with its drive motor 12, both carriers 9 »11 are still on a relatively long tension spring 13 connected to one another, each of which is suspended from the front end of the carrier 9, 11.

By stops between the two carriers 9, 11 a gap 14 is maintained, which is smaller than the minimum diameter of the ball that occurs during normal production. One with each pass Ball through the gap 14, the upper carrier 9 leads a small pivoting movement around the joint 10, whereby the spring 13 is lengthened somewhat.

In this way it is ensured that when the balls pass through the gap 14, practically always the same contact pressure is exerted on the balls. Despite the small guide path of the ^above ASES zv-is hen σ η disks 6, 7 this to the full extent ^ e-

6251/01 / Ch / sr - 5 - December 21, 1972

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speed of the disks 6, 7 accelerated. Are the circumferential speeds of the disks 6, 7 are different, then the balls get when they are ejected a twisting motion. Different speeds can easily be achieved because of the separate working Drive motors 8, 12 can be adjusted.

In order to be able to set different ejection angles in the vertical plane, the lower support is 1 "below the axis of rotation for the disc 7 via a joint 15 with a horizontally extending axis. With a Plate 16 connected. A geared motor 17 is also attached to the plate 16, on which it is eccentric tin lever 18 is hinged. This lever 18 is still ge? ; nkig connected to the carrier 11. On dle-3e Way can the two disks 6, 7 with their door? ^ m 9 11 at ^?. s joint 15 from a position I. "hi.-: u can be swiveled to a position II. In corresponding The ejection winch-I also changes. 1 in the vertical plane.

In order to ensure proper feeding of the balls via the flexible tube 5 in every position, has the tube 5 of an extension 19, which with the lower Support 11 is connected and right into the Spalc area 14.

In order to be able to change the ejection angle in the horizontal plane. the table 16 is connected to the bottom of the housing 1 via a joint 20. The Geler> 0 "located at the rear of the Ti iches 16 _f ^r to be"> r front via a suitable guide pm iodine;. N of the housing 1 is supported.

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6251/01 / Ch / sr

December 21, 1972

A lever 21, which is eccentrically connected to a gear motor 22, acts on this table. To this A lateral movement of the ejection mechanism is possible and thus the desired change in the ejection angle in the horizontal plane.

The motors 3, 8, 12, 17 and 22 can be controlled all or in part by an automatic program so that the ejection of the balls can be varied within wide limits.

EXPECTATIONS

Claims (11)

EXPECTATIONS 1. Gsrät for ejecting tennis balls that are stored in a magazine and one at a time Ejection mechanism, which consists of two counter-rotating discs, are fed between which the ball to be thrown detected, accelerated due to the peripheral speed of the discs and is ejected according to a certain guide path, characterized in that the two disks are elastically braced against each other in the plane of the disk and the balls close to the gap between the discs are fed directly to the side opposite the ejection side. 2. Apparatus according to claim 1, characterized in that g e k e η η. that the first disc bearing support is hinged to the support that supports the l // side disk, with between a spring is arranged on the two supports. 3. Apparatus according to claim 2, characterized in that the connecting lines between the disc axes and each of the hinge point between the girders forms a V, at the the tension spring engages free legs. ft / • * 6251/01 / Ch / sr - 8 - December 21, 1972 4. Apparatus according to claim 1, characterized in that the first disc bearing support is pivotable in the plane of the disc about a horizontal axis below the The axis of rotation of the orsten disc is located. 5. Apparatus according to claim 1, characterized in that on which the first disc A lever that is eccentrically articulated to a gear motor engages the bearing support. 6. Apparatus according to claim 1, characterized in that g e k e η η drawing t that the support supporting the first disc is arranged on a table which can be pivoted about a vertical axis. 7. Apparatus according to claim 6, characterized in that on the table one on one Gear motor engages eccentrically hinged lever. 8. Apparatus according to claim U to 6 “characterized in that the carrier supporting the first disc is hinged to the table and the table carries the geared motor. 9. Apparatus according to claim 4 and / or 6, characterized in that between the magazine and the supports an opening at the level of the gap flexible pipe runs. 6251/01 / Ch / sr - 9 - December 21, 1972 10. Apparatus according to claim 9, characterized in that the tube has an extension attached to one of the carriers. 11. Apparatus according to claim 1, characterized in that each of the disks has one Has drive motor.