EP0682958A1 - Training device with stroke analysis for golfers - Google Patents

Abstract

The device includes a stand (3) with a horizontal branch (4) at the top with a cable suspended from the end. The cable is mounted so it can rotate, and carries a golf ball on the lower end. A number of sensors within the stand detect the speed and angle at which the ball is struck by the golf club during a practice shot. From this, the distance travelled by the ball can be determined, for comparison with the reference trajectory which was intended. The mounting of the ball allows movement towards or away from the stand, as well as in the direction of swing. <IMAGE>

Description

The present invention relates to a training device for golfers which makes it possible to measure and analyze the strike of a golf ball, by its distance between the point of shooting and the point of fall of the ball.

This training device allows golfers to train in a small space. By hitting the golf ball suspended from said device, golfers are shown the distance that the golf ball would normally have traveled under normal conditions of a golf course.

The golfer also sees displayed the shooting angle of his ball or, according to the various embodiments, the distance existing between the point of fall of the ball and the perpendicular, coming from the initial trajectory, passing through the point of fall.

The state of the art can be defined by the following patents.

The document FR-A-2.649.901 relates to a device allowing golfers to perform swings on reduced spaces. It consists of a regulatory golf ball attached to one end of the cord, a base secured to a mat fitted with a tee. The other end of the cord passes through the guide, wraps around the pulley. At the start, the spring is relaxed. The stopper is supported on the guide. After the swing, the ball stops, the spring, stretched, exerts a pull on the cord. The rollers block the pulley. The pedal controls the rebound of the spring. The rollers driven by the pulley slow down the return movement. The device according to the invention opposes violent return and dangerous ball.

Document WO-A-91/01166 proposes a device allowing an individual to train alone or with a partner to type golf shots which comprises a golf ball attached by a non-elastic cord to a coil of cord and a elastic segment attaching the rope to an anchor point of the device to facilitate the return of the ball. The length of the rope can be determined by the golfer and wound up using the spool for storage after use.

The document FR-A-2,598,924 has for particularity a training device for golfers, more commonly called "golf practice", which is characterized in that it is constituted by a bracket whose horizontal branch carries a coil or analogous, for supporting and unwinding a wire at the free end of which a golf ball is fixed, the wire being able to be unwound from top to bottom to ground level and the spool being able to be locked in rotation.

For all these devices, the goal is to allow golfers to train at the level of their gesture, but without any possibility of analyzing the resulting stroke.

This is not the case with the present invention, nor with the following document.

WO-A-93/08881 relates to a method and an apparatus for measuring the length of a golf drive, the method comprising measuring the initial speed of a golf ball attached to a rotary axis by the 'through a string. The axis carries a slotted disk, which cooperates with a receiver and optical sensor unit in order to determine the angular speed of the axis. The output signal from the optical unit serves as an input signal for an electrical device which will calculate the distance the ball would have traveled if it had not been attached. The calculated distance is displayed on a liquid crystal display device.

In this case, it is possible to know the length of the golf stroke. However, this device has two essential drawbacks.

On the one hand, the value of the length of the shot is not reliable since, due to the structure of the device, a small inclination of the suspension cable of the golf ball, moved in rotation, will cause an increase friction and a loss of kinetic energy of the ball. This is due to the fact that when the bale is rotated on a fixed axis with shoulders, it cannot describe a regular rotation, since the twine on the fixed axis will go from one shoulder to the other at each half-turn, which will slow down the speed of the ball and cannot give an even approximate idea of the strike of this one. The distance displayed will therefore be distorted compared to the true distance.

On the other hand, it is not possible to measure the firing angle of the bullet relative to the reference trajectory of the bullet represented on the ground carpet formed by the base.

Finally, document US-A-3,472,075 relates to a golf simulation system, in which the results associated with a golf stroke are indicated by a mobile display. Counterweight balls are attached to the ends of a tube which is carried by a horizontal shaft mounted movable in rotation. A structure simulating the ground is located below the horizontal tree, so that the balls continuously pass over it. The horizontal shaft can also be moved axially, as is the case in rotation, and each movement is applied to a structure forming a screen. More specifically, a reading tip or a marker is movable on the screen, in order to allow the representation, on a reduced scale, of the trajectory of the ball.

In this document, the rotational movement does not pose any problem, on the other hand the axial movement of the horizontal shaft is effected by displacement of the tube and the balls, located at the end of said tube, this displacement being effected in "only one block". The tube will therefore undergo bending forces to allow the shaft to be moved axially. The structure of the simulation system is not adapted to receive such forces, which will increase friction and distort the values of angle and length of shot.

In fact, there is no connecting means allowing the inclination of the tube relative to the horizontal shaft, as is the case with the present invention.

In addition, all the data is measured mechanically, the efficiency and the cost of manufacturing such a system are therefore unsuitable for significant commercialization.

The present invention aims to solve all the drawbacks of the state of the art, by proposing a training device for golfers intended to measure and analyze the striking of a ball. Said device is of the type consisting of a bracket whose free end of the horizontal branch is equipped with a cable suspended in a rotatable manner and at the lower end of which is fixed and suspended the golf ball at ground level, when the device is at rest, the horizontal branch contains a main axis movable in rotation and in translation according to the distance and the firing angle. This training device for golfers is characterized by the fact that a connecting means ensures the connection between the upper end of the cable and the main axis, said connecting means transmits to said movable main axis, in a proportional manner, the speed of rotation of the ball around said axis and its firing angle, and is characterized by the fact that one or more sensors transmit data to means which analyze the speed of rotation of the axis to determine the distance of the shot and the transverse movement of said movable axis to determine the distance between the point of fall of the ball and the reference trajectory.

The connecting means is a cam.

• d'un premier axe d'articulation solidaire et perpendiculaire audit axe principal, autour duquel le moyen de liaison peut pivoter dans un plan formé par l'axe principal et par le câble suspendu, et
• d'un second axe d'articulation parallèle au premier axe qui est mobile en rotation mais fixe en translation, de manière à ce que tout déplacement dudit moyen de liaison dans son plan, lors de la mise en rotation de l'ensemble, entraîne le déplacement en translation dudit axe principal mobile en rotation et en translation.

The connecting means cooperates with the main axis mobile in rotation and in translation by means of:

• a first articulation axis integral and perpendicular to said main axis, around which the connecting means can pivot in a plane formed by the main axis and by the suspended cable, and
• a second articulation axis parallel to the first axis which is mobile in rotation but fixed in translation, so that any movement of said connecting means in its plane, when the assembly is rotated, causes the displacement in translation of said main axis movable in rotation and in translation.

According to one embodiment, the first axis is placed above the second axis.

According to another embodiment, the first axis is placed below the second axis.

Whatever the embodiment, the main movable axis in rotation and in translation is coaxially and partially enclosed in a hollow axis, and the connection means and the end of the mobile axis, which cooperates with said connection means, are positioned inside a hollow nut, the hollow axis and the hollow nut forming a single mobile casing in rotation. The second axis is integral with the hollow nut.

The main axis is partially enclosed in a coil and plays the role of metal core, and the sensor (s) are sensitive to variations in magnetic fields due to the displacement of the main axis inside the coil.

In another case, the main axis comprises, at the level of the optical sensor or sensors, on the one hand, a paint area reflecting the light coming from a light source, and on the other hand, a paint area absorbing said light. The interface between the two painting zones is then formed by an ellipse corresponding to a cross section with respect to the longitudinal axis of the mobile axis.

The means for analyzing the data transmitted by the sensors are formed by at least one trigger, at least one sequencer, at least one integrator, and at least one comparator, which cooperate to allow display on a screen, on the one hand the distance of the shot and on the other hand the distance between the point of fall and the reference trajectory. The device includes a base.

The attached drawings are given as indicative and non-limiting examples. They represent several preferred embodiments according to the invention. They will allow the invention to be easily understood.

FIG. 1 represents a general perspective view of an embodiment according to the invention where the device comprises a base allowing the golfer to position his feet on said base, which at the same time stabilizes the device on the ground.

Figure 2 shows a perspective view of another embodiment.

3 shows a longitudinal section of the upper horizontal branch of the bracket forming the frame of the drive device, in which the connecting piece is at rest or is rotated without angular deviation, according to another embodiment.

FIG. 4 represents a section along NN in FIG. 3.

FIG. 5 represents a view identical to FIG. 3, but in which the connecting piece is driven in a rotational movement with angular deviation to the right or to the left.

6 shows a longitudinal section of the upper horizontal branch of the bracket forming the frame of the drive device, according to another embodiment, in which the connecting piece is at rest or is driven in a rotational movement without angular deviation.

FIG. 7 represents a section along M-M of FIG. 6.

Figure 8 shows a view identical to Figure 6, but in which the connecting piece is driven in a rotational movement with angular deviation to the right or to the left.

Figure 9 shows a developed end of the main axis carrying a painted helical strip; in this figure, a complete revolution is delimited by the two vertical dotted lines.

FIG. 10 represents the information recorded using the sensors according to the angle of inclination taken by the connecting piece, the cable and the golf ball.

Figure 11 shows the principle of the circuits used for the calculations of the shooting angle of the bullet and the distance it would have crossed if it had been free.

FIG. 12 represents the voltage variations at the output of the various components forming the circuits used for the calculations.

The present invention relates to a training device 1 intended for use by golfers 45 who wish to measure and analyze the strike of their shots.

This striking is carried out on a ball 2 which is fixed and suspended at the end of a cable 5, itself suspended in a rotary manner with respect to a horizontal branch 4 of a bracket 3.

This bracket 3 forms, with a base 13, the entire structure of said device 1. This is clearly seen in FIG. 1.

According to Figures 3 and 6, two preferred embodiments are shown.

These have in common a connecting means 6 or 16 which ensures the connection between the upper end of the cable 5 and a main axis movable in rotation and in translation 7 or 17, present at the level of the horizontal branch 4 of the bracket 3.

The essence of the invention resides in the fact that the connecting means 6 or 16 has the possibility of transmitting to the main movable axis 7 or 17, proportionally, the speed of rotation of the ball 2 around said axis 7 or 17, as well as the shooting angle, that is to say the angle between the plane perpendicular to the moving axis and the plane of rotation of the bullet.

This is clearly seen in Figures 5 and 8.

In all cases, a sensor 8 will make it possible to transmit the data to means which will be described later, these means having the ability to analyze on the one hand the speed of rotation of the movable main axis 7 or 17 for determining the distance of the shot, and on the other hand the transverse displacement of said movable axis 7 or 17 to determine the angle of shot and, by extension, the distance d between the point of fall and the perpendicular, coming from the initial trajectory 46 , passing through the drop point. The trajectory 46 is symbolized on the ground, formed by the base 13, by a straight line or initial trajectory 46. This distance d is easily calculated by the means of analysis of the data transmitted, by a simple trigonometric calculation, given that d is akin to the opposite side of a right triangle, the angle of which is known and the hypotenuse which is equal to the shooting distance.

   d'où, $$\text{d = sinus (angle de tir) x distance de tir}$$

Thus, the following calculation makes it possible to obtain d: $$\text{sine (firing angle) = d / firing distance}$$

from where, $$\text{d = sine (shooting angle) x shooting distance}$$

This connecting means 6 or 16 is formed by a cam 6 or 16.

This connecting means 6 or 16 cooperates with the main axis movable in rotation and in translation 7 or 17, first of all by means of a first articulation axis 9 or 19, which is integral and perpendicular to said axis main 7 or 17, around which the connecting means 9 or 19 can pivot in a plane formed by the main axis 7 or 17 and by the suspended cable 5, then, by means of a second articulation axis 10 or 20 parallel to the first axis 9 or 19; this second axis 10 or 20 is mobile in rotation, like said first axis 9 or 19, but fixed in translation, which is not the case with axis 9 or 19.

In this way, any movement of the connection means in its plane, when the ball 2-cable 5-connection piece 6 or 16 assembly is rotated, causes said movable main axis 7 or 17 to move in translation.

In the case shown in Figures 3 to 5, the first axis 9 is movable in rotation as well as in translation. This 9 is placed below the second axis 10.

In the embodiment of FIGS. 6 to 8, the first axis 19 is placed above the second axis 20.

This first axis 19 is mobile in rotation and in translation, while the second axis 20 is mobile in rotation only.

In both cases, the axes 10 and 20, which are fixed in translation, are secured to a hollow nut 12 or 22. The latter is itself secured to a hollow axis 11 or 21.

This hollow axis 11 or 21 is coaxial and partially encloses the main axis mobile in rotation and in translation 7 or 17.

To facilitate rotation of the hollow axis 11 or 21, the latter is mounted on bearings 33.

In fact, the main movable axis 7 or 17 exceeds, by its two ends, the hollow axis 11 or 21.

One of its ends cooperates with the connecting means 6 or 16 and is positioned inside the hollow nut 12 or 22.

The other end has the function of allowing the measurement on the one hand of the rotation of said movable axis 7 or 17 and on the other hand of its translation; it will therefore cooperate with the sensor 8.

The assembly formed by the hollow axis 11 or 21 and the hollow nut 12 or 22 forms a single and mobile housing rotating.

The second axis 10 or 20 will therefore be secured to the hollow nut 12 or 22 and allow the rotation of the other axis 9 or 19 in the plane formed by the movable axis 7 or 17 and the cable 5, and thus, the displacement in translation of the main axis 7 or 17. The connecting means 6 or 16 therefore has a lever arm function.

The free end of the main axis 7 or 17, which makes it possible to analyze the length and the firing angle, is placed in the field of action of a sensor 8, which according to one embodiment can be sensitive to variations in magnetic field, for example, using the moving axis 7 or 17 as a soft iron core moving inside a coil into which current is injected, which will tend to increase or decrease the magnetic fields depending on the amount of soft iron present inside the coil.

According to a preferred embodiment shown in the figures, the main axis 7 or 17 comprises, at the level of the optical sensor 8, on the one hand a paint zone reflecting the light 14 coming from a light source, and on the other hand apart from a paint area absorbing said light 15.

There is therefore an interface 18 between the two painting zones.

This interface 18 is formed by an ellipse corresponding to a cross section with respect to the longitudinal axis of the mobile axis 7 or 17. This is clearly seen in FIGS. 3 and 6.

The device is thus thus made that when the cam 6 or 16 oscillates around its fixed axis in translation 10 or 20, the main movable axis 7 or 17 in translation according to F3 or F4 or else F7 or F8 and in rotation, according to F9 , moves longitudinally inside the hollow axis 11 or 21 and its movement is then proportional to the angle of oscillation along F1 or F2 or else F5 or F6 of said cam 6 or 16.

Of course, the optical sensor or the photoelectric cell 8 is placed opposite the part of the main axis 7 or 17 which carries the paint zones 14 and 15 and is substantially centered relative to these 14 and 15.

The presence of an emitting diode and a cell 8, capable of picking up the light received and reflected by the zones 14 and 15 located opposite the diode and the cell 8, will make it possible to determine the durations and the number of passages at each reflective 14 or absorbent 15 paint area.

When the ball 2 has been hit, it drives the cam 6 or 16, the hollow nut 12 or 22 and the main axis 7 or 17 in rotation.

If the rotation of the ball is in a plane perpendicular to the axis 7 or 17, the photoelectric cell 8 will follow line A of Figures 9 and 10. The time of passage of the black zone in front of said photoelectric will be equal to the time of passage of the reflecting zone. In this case, the cell will deliver an alternating signal in the form of a report slot. cyclic substantially equal to one.

If the ball is rotated in a vertical plane making an angle with the plane perpendicular to the axis of rotation 11, cell 8 will follow the line B of sinusoidal shape which crosses the boundary between the black and reflective zones in two points. In this case, the rising and falling sides will move and the duty cycle will therefore no longer be the same. It will be representative of the inclination of the plane of rotation of the ball.

If the ball moves in an inclined plane but perpendicular to the plane of Figures 3 or 6, cell 8 will then follow line C. The points of intersection will be moved but the duty cycle will remain equal to one.

A measurement of this latter inclination is possible by putting another photoelectric assembly always looking at the main movable axis 7 or 17, but offset by 90 relative to the first sensor 8.

The signal from the photoelectric cell 8 is sent to a shaping circuit, of the trigger type 23 and whose output signal 34 is sent on the one hand to a sequencer 24 and on the other hand to an integrator 25 .

The sequencer 24 generates control signals for the various circuits of the electronics. These signals come out on outputs 38, 39, 40 and 44.

An integrator 26 receives a reference voltage 31. It is triggered at a time TO by the output 38 of the sequencer 24 during the first rising edge of the signal 34, coming from the trigger 23. It integrates the reference voltage up to a time T1 triggered by the next rising edge of signal 34, therefore for the duration of an entire period of the input signal, that is to say during a complete revolution of ball 2, hereinafter called the reference revolution .

At the end of this round, its output voltage 35 is proportional to its duration. This signal 35 is sent to another integrator 27 which is triggered by the output 44 of the sequencer 24 at the end of the reference lap, at time T1.

The output 36 of this integrator will vary all the more quickly the greater its input voltage 35 and therefore the longer the duration of the reference turn. This output is sent to a comparator 30 which compares it to a reference voltage. When this voltage reaches the reference voltage, at a time T2, the comparator 30 sends a control signal 37 to the sequencer 24. The interval T2-T1 is shorter as the input voltage of the integrator 27 is great and therefore that the reference lap was long. This time is therefore proportional to the speed of the bullet when fired.

The sequencer 24 also controls, via its output 40, two successive integrators 28 and 29, during the interval T2-T1. The integrator 28 receives the reference voltage 31 which it therefore integrates during the time interval T2-T1. Its output voltage, at time T2, is proportional to this interval T2-T1.

The integrator 29 integrates the output voltage 41 of the integrator 28 during the same time interval T2-T1. Its output voltage 42, at time T2, will therefore be proportional to the square of the interval T2-T1, and therefore proportional to the square of the speed of the ball 2 during the shooting. Since the distance traveled by the ball 2 is itself proportional to the square of the initial speed of the ball 2, the output voltage 42 of the integrator 29 is representative of the distance traveled. It can be sent to a scaling and display module 32.

The calculation of the firing angle is done by an integrator 25 which receives on the one hand the slots 34 coming from the trigger 23 and on the other hand the reference voltage 31. It is controlled by the output 39 of the sequencer 24. That -ci controls this integrator 25 for a predetermined time rounded to an integer of period. When the signal from the trigger 23 is high, the integrator integrates the reference voltage 31 in one direction and when the same signal is low, said integrator integrates said reference voltage in the other direction. When the duty cycle of signal 34 is equal to 1, the result of this alternative integration is zero; when the duty cycle is different from 1, the result is proportional to the deviation from this duty cycle. The output 43 of this integrator 25 therefore gives, with the corresponding sign, a voltage proportional to the firing angle. This voltage is sent to the scaling and display module 32.

According to a preferred embodiment, the signal transmitted by the sensors is shaped to be able to be analyzed by a microprocessor and allow the display on a screen, on the one hand of the distance of the shot and on the other hand of the distance between the point of fall and the perpendicular from the reference path passing through said point of fall.

• d'une part T1, le temps écoulé à partir du premier front descendant t0 qu'il rencontre jusqu'au front montant t1 suivant,
• d'autre part T2, le temps écoulé à partir du premier front descendant t0 jusqu'au front descendant t2 suivant.

The signal from the photoelectric cell 8 is sent to a shaping circuit with amplitude and shape standards for electric signals (TTL), then introduced to the front capture input of the microprocessor signal. The microprocessor measures precisely, as can be seen in FIG. 10:

• on the one hand T1, the time elapsed from the first falling edge t0 that it meets until the next rising edge t1,
• on the other hand T2, the time elapsed from the first falling edge t0 to the next falling edge t2.

Time T2 is the signal period and is inversely proportional to the speed of the ball.

The T1 / T2 ratio is representative of the angle of the plane of rotation of the ball relative to the vertical.

REFERENCES

• 1. Golf training device
• 2. Golf ball
• 3. Stem
• 4. Horizontal branch of the jib 3
• 5. Bale suspension cable 2
• 6. Connection means or cam
• 7. Main axis movable in translation and in rotation
• 8. Optical or magnetic sensors or photoelectric cells
• 9. First axis of articulation
• 10. Second axis of articulation
• 11. Hollow axis containing the main axis 7
• 12. Hollow nut secured to the hollow axis 11
• 13. Device base 1
• 14. Light reflecting paint area
• 15. Light absorbing paint area
• 16. Connection means or cam
• 17. Main axis movable in translation and in rotation
• 18. Interface between the two paint zones 14 and 15
• 19. First axis of articulation
• 20. Second axis of articulation
• 21. Hollow axis containing the main axis 17
• 22. Hollow nut secured to the hollow axis 21
• 23. Trigger
• 24. Sequencer
• 25,26,27,28 and 29. Integrators
• 30. Comparator
• 31. Reference voltage
• 32. Display screen
• 33. Bearings
• 34. Trigger output signal or voltage 23
• 35, 36, 41, 42 and 43. Signal or output voltage of integrators 25 to 29
• 37. Comparator output signal or voltage 30
• 38, 39, 40 and 44. Sequencer output signals or voltages 24
• 45. Golfers
• 46. Reference trajectory represented on the base 13
• A. Line followed by the sensor 8, when the plane of rotation of the ball 2 is not deflected
• B. Line followed by the sensor 8, when the plane of rotation of the ball 2 is inclined to the right or to the left
• C. Line followed by the sensor 8, when the plane of rotation of the ball 2 is inclined to the right and to the left while cutting the non-deviated trajectory at two points corresponding to the two points of the interface 18 which are centered with respect to said sensor 8.
• F1. Swiveling connecting means 6 to the left
• F2. Pivoting the connecting means 6 to the right
• F3. Translation of main axis 7 to the left due to pivoting F1
• F4. Translation of main axis 7 to the right due to pivoting F2
• F5. Pivoting the connecting means 16 to the right
• F6. Pivoting the connecting means 16 to the left
• F7. Translation of main axis 17 to the left due to pivoting F5
• F8. Translation of main axis 17 to the right due to pivoting F6
• F9. Main axis rotational movement 17

Claims (12)

Training device (1) for golfers intended to measure and analyze the striking of a ball (2), said device (1) is of the type consisting of a bracket (3) whose free end of the horizontal branch ( 4) is fitted with a cable (5) rotatably suspended and at the lower end of which the golf ball (2) is fixed and suspended at ground level, when the device (1) is at rest, the branch (4) contains a main axis movable in rotation and in translation (7 or 17), depending on the distance and the firing angle, characterized by the fact
that a connecting means (6 or 16) provides the connection between the upper end of the cable (5) and the axis (7 or 17), said connecting means (6 or 16) transmits proportionally to said main axis mobile (7 or 17) the speed of rotation of the bullet (2) around said axis (7 or 17) and its firing angle, and
that one or more sensors (8) transmit data to means which analyze the speed of rotation of the axis to determine the distance of the shot and the transverse movement of said movable axis (7 or 17) to determine the angle of shot and / or the distance between the point of fall of the ball (2) and the reference trajectory (46). Device according to claim 1, characterized in that
that the connecting means (6 or 16) is a cam (6 or 16). Device according to either of Claims 1 and 2, characterized in that
that the connecting means (6 or 16) cooperate with the main axis movable in rotation and in translation (7 or 17) by means of: - a first articulation axis (9 or 19) integral and perpendicular to said main axis (7 or 17), around which the connecting means (9 or 19) can pivot in a plane formed by the main axis (7 or 17) and by the hanging cable (5), and - a second articulation axis (10 or 20) parallel to the first axis (9 or 19) which is mobile in rotation but fixed in translation, so that any movement of said connecting means (6 or 16) in its plane, when the assembly is rotated, causes said movable main axis to move in translation (7 or 17) in rotation and in translation. Device according to claim 3, characterized in that
that the first axis (9 or 19) is placed above the second axis (10 or 20). Device according to claim 3, characterized in that
that the first axis (9 or 19) is placed below the second axis (10 or 20). Device according to either of Claims 1 and 3, characterized in that
that the main axis movable in rotation and in translation (7 or 17) is coaxially and partially enclosed in a hollow axis (11 or 21), and
that the connecting means (6 or 16) and the end of the movable axis (7 or 17), which cooperates with said connecting means (6 or 16), are positioned inside a hollow nut ( 12 or 22), the hollow shaft (11 or 21) and the hollow nut (12 or 22) forming a single, mobile housing in rotation. Device according to claims 3 and 6, characterized in that
that the second axis (10 or 20) is integral with the hollow nut (12 or 22). Device according to claim 1, characterized by the fact
the main axis (7 or 17) is partially enclosed in a coil and acts as a metal core, and
that the sensor (s) are sensitive to variations in magnetic fields due to the displacement of the main axis inside the coil. Device according to claim 1, characterized by the fact
that the main axis (7 or 17) comprises, at the level of the optical sensor (s) (8), on the one hand, a zone of paint reflecting the light (14) coming from a light source, and on the other hand , a paint area absorbing said light (15). Device according to claim 9, characterized in that
that the interface (18) between the two painting zones (14 and 15) is formed by an ellipse corresponding to a cross section with respect to the longitudinal axis of the movable axis (7 or 17). Device according to any one of claims 1, 7, 8 or 9, characterized in that
that the means for analyzing the data transmitted by the sensors (8) are formed by: - at least one trigger (23), - at least one sequencer (24), - at least one integrator (25, 26, 27, 28 or 29), and - at least one comparator (30), which cooperate to allow the display on a screen (32), on the one hand of the distance of the shot, and on the other hand of the distance between the drop point and the perpendicular from of the initial trajectory passing through said drop point. Device according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or 11 characterized in that it comprises a base (13).

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