Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1983-04-28
1985-06-18
Pinkham, Richard C.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273408, 226 20, F41J 502
Patent
active
045237611
DESCRIPTION:
BRIEF SUMMARY
The targets used in firing practice have a number of concentric rings and a centrally disposed, dark bull's eye. The distance from the center of the bull's eye to the entry hole is measured with the eye.
It is an object of the invention to provide a method and apparatus for an automatic rating of hits on targets so that subjective errors in measurement will be avoided, a more accurate rating is ensured and the time required for the rating is reduced.
The invention resides basically in that an individual target sheet or a web provided with a plurality of targets is moved through a first photoelectric detector system, which generates in the direction of web travel x a hole center signal Lx and a bull's eye center signal Sx. The means for driving the web generate travel pulse signals Ix, which are proportional to the travel of the web. A pulse-controlled gating circuit transmits only those travel pulses which occur between the times at which the signals Lx and Sx occur. These travel pulses are counted to obtain a total travel pulse count X. A second photoelectric detector system, which corresponds to the first and has a light path which is at right angles to that of the first photoelectric detector system, is moved relative to the target transversely to the direction of travel of said target and travel pulses representing the travel in the direction y of that transverse movement and occurring between the times at which a hole center signal Ly and a bull's eye center signal Sy occur are summed up to form a total count Y. The total counts X and Y are applied to a vector computer, which computes the parameter r=.sqroot.X.sup.2 +Y.sup.2, wherein r is proportional to the distance from the center of the entry hole to the center of the bull's eye. That parameter r is multiplied with an adjustable calibrationing factor. The result is indicated as a ring rating, e.g., a tenth-of-a-ring rating, and/or is delivered to a printer or an electric data processing system.
To generate the center signals, edge signals representing mutually opposite edge portions of a hole are generated. The accuracy of this rating is higher by a factor of 10 than the accuracy of a manual rating and the rating takes only about 1 second.
An illustrative embodiment is shown on the drawing.
FIG. 1 is a side elevation showing the rating apparatus;
FIG. 2 is a diagrammatic top plan view showing the apparatus of FIG. 1;
FIG. 3 is a diagrammatic representation of the arrangement and function of one of two photoelectric detector systems which are employed;
FIG. 4 is a perspective view showing one half of a stationary photoelectric detector system, which is disposed in front of the first pair of feed rollers;
FIG. 5 is a circuit diagram showing the various electronic components.
The apparatus for rating hits on targets comprises a prismatic housing 14, which has on the front side a tapering entrance slot 22 and in the opposite housing wall an exit slot 16. A target web 18, which is provided with a plurality of targets having outer rings and a central bull's eye 20, is inserted into the slot 22 and before being engaged by a pair of feed rollers 24, 26 moves successively through two photoelectric detector systems 1 and 3. A second pair of rollers 28, 30 are provided between the photoelectric detector systems 1 and 3 and serve for a rating of hits on individual target sheets. The roller 28 is directly driven by a drive motor 36, which is connected to a stepping pulse generator 2. The two rollers 24, 28 carry gears 31, 32 and are synchronized by a toothed belt 34.
The second photoelectric detector system 3 is mounted on a transversely movable cross slide 38, which comprises a top plate 40 and a bottom plate 42'. The two plates 40 and 42' are slidably guided independently of each other on guide rods 42, 44 and 46, 48, respectively, which are fixed in the housing. Outside the path of the target web 18, a vertical drive shaft 50 is rotatably mounted on one side and a reversing shaft 52 is rotatably mounted on the other side. The two shafts carry upper and lower
REFERENCES:
patent: 3700909 (1972-10-01), Murray et al.
patent: 3786265 (1974-01-01), Abilock et al.
patent: 3835332 (1974-09-01), Bridges
patent: 4075498 (1978-02-01), Takasuka et al.
patent: 4247116 (1981-01-01), McQuary
patent: 4427199 (1984-01-01), Faith
Picard Leo P.
Pinkham Richard C.
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