DISPOSITIF DE MESURE DE LA VITESSE DE REPRISE D'UNE RAMPE D'ARROSAGE

DEVICE FOR MEASURING THE TAKE-UP SPEED OF THE SPRINKLER TUBE OF SPRINKLING MACHINES

Abrégé anglais

ABSTRACT OF THE DISCLOSURE
An indexable composite cutting insert which is
generally polygonal in plan view and includes spaced
upper and lower surfaces is composed of n core, such
as a Sic-Si composite material, with the corners along
one surface of the composite cutting insert being made
of d superhard material of diamond or cubic boron nitride
crystals bonded to the core. The limited use of super-
hard crystals in the critical areas of the cutting edges
of the insert results in significant cost savings, both
in manufacturing costs and costs of materials, as well
as minimum warpage of the insert. In addition, improved
wear resistance of the cutting edges of the insert is
obtained.

Revendications

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for measuring the take-up speed of a sprink-
ler tube of a sprinkling machine having a piston motor, comprising
a piston reciprocatable in a cylinder, driven by sprinkling water,
which motor on reciprocation of the piston sets a tube winch into
rotation by way of pusher pawls, driving means arranged to be
actuated by the motion of the piston and adapted to drive the
shaft of a tachometer.
2. A device according to claim 1, in which a driving
cord, wound about a driving roller for the tachometer secured to
the cylinder, engages with one end of the piston and has its
other end fixedly anchored via a restoring spring.
3. A device according to claim 1, in which on the
tachometer has a scale on which there are inscribed speed values
to the right and to the left of a middle zero marking which indi-
cates the stationary position of the piston.
4. A device according to claim 3, in which the tacho-
meter scale comprises concentric circles for a plurality of layers
of the tube on the tube winch as well as curvilinear markings
extending downwardly in the direction of the tachometer center
from the speed values inscribed on the largest circle, their
intersections with the concentric circles enabling the reading
of the speed values corresponding to the current position of the
tube on the winch.
5. A device according to claim 1, in which the piston
is provided with a rack meshing with a pinion which is directly
coupled or coupled by way of a transmission to the shaft of the
tachometer.
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Description

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The invention relates -to a device for measuring -the
take-up speed of the sprinkler -tube of a sprinkling machine whose
piston mo-tor, driven by the sprinkling water, in its turn sets
the -tube winch in rotation via pusher pawls. In such a sprinkling
machine the flexible -tube is slowly coiled on the -tube reel dur-
ing the sprinkling process, the sprinkler carriage mounted at the
tube end sprinkling a strip of field of predetermined width during
this take-up process. The sprinkling width of the strip is
de-termined by the characteris-tic-s of the employed sector sprink-
10 ler and by the water pressure available at the sprinkler nozzle;the maximum possible length of the sprinkling strip corresponds
to the tube length available on the implement increased by -the
throwing distance of the sprinkler.
In such implements the tube winch is driven either by
means of a water turbine, which is directly supplied with the
sprinkling wa-ter being used, or with the aid of a pis-ton motor
using a small branched-off partial flow of the available water
quantity as a drive means; this driving water does not return to
the main sprinkler but is spread ou-t separately by means of a
20 minisprinkler in the immediate vicinity of -the sprinkling imple-
ment.
In implements with a driving turbine it is possible
l~ithout difficulty, and is customary açcording to the s-tate of
the a.rt, to measure and -to visually display the take-up velocity
of the sprinkling tube with the ai.d of a suitable tachometer as
a direct function of the rotary speed of the tube winch. In im-
plements wi-th piston-motor dri.ve, however, a velocity indication
has been unknown up to now. The difficul-ty appears to reside in
the fact that the piston drive in mos-t instances does not work
30 into a rotating shaft but transmits the driving force directly
to the circumference of the tube winch by means of pusher pawls.
In contrast to the.turbine implement, thereEore, no rotating
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-transmission part is availahle from which -the tachome-ter drive
can be branched off; morever, the piston motion is no-t uniEorm
bu-t intermittent.
For the user of sprinkling machines, however, the read-
abili-ty of the take-up speed is of essential signif~icance since
sprinkling cycles last mostly through -the night (the duration of
a tube take-up amountsto about 6 to 12 hours) and the farmer must
precalculate the time a-t which he has to revisit the implement
after the end of the sprinkling process.
T~e conven-tional pis-ton-driven implemen-ts, accordingly,
have the disadvantage of affording no speed readou-t but are ad-
vantageous in that they can be operated with a reduced expenditure
of energy.
The invention enhances the attractiveness of pis-ton-
driven reel-type sprinkling machines and enables the direct read-
ing of the take-up speed of the sprinkling -tube also with this
type of implement.
According to the present invention the pis-ton of the
piston motor is in driving connec-tion with the shaft of a tacho-
20 meter.
In this way it is possible to convert the reciprocatingpiston motion into a rotary motion which the -tachometer directly
displays as velocity, e.g. in meters per hour.
In accordance with one embocliment oE the invention, a
driving cord wound a,round a drive roller for the tachometer
secured to the cylinder of the piston mo-tor, engages with one end
of the reciprocating piston of -the piston mo-tor and has its other
end fixedly anchored by way of a restoring spring. This is par-
ticularly simple and insures a dependable motion transmission
30 from the piston to the tachome-ter shaft.
According to the invention it is also desirable that
speed values (m/h) are inscribed on the tachometer scale to the

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right and to the left oE a middle zero marking (piston position
at standstill). These values can -therefore be read direc-tly on
the scale of the tachome-ter~
In accordance with another embodiment oE the present
invention the scale of the tachometer comprise~ concentric cir-
cles for, e.g., four layers of the tube on the tube winch, along
with curvilinear scale markings extending downward in the direc-
tion of the tachometer center from the speed values inscribed on
the largest circle, their in-tersections with the concen-tric cir-
10 cles enabling the reading of the speed values corresponding tothe current position of the tube on the winch. Finally it is
also possible, in accordance with the invention, -to equip the
piston with a rack meshing with a pinion which is coupled di-
rectly or via a transmission with the tachometer. This solu-tion
of the stated problem also requires only simple means for imple-
menting the measuremen-t and indication of the speed.
The invention is illustra-ted in greater de-tail in the
drawing with reference to embodiments -thereof.
Fig. 1 shows in side view a piston drive for a tube
20 winch with the device according to the invention;
Fig. 2 shows a tachometer with scale markings; and
Fig. 3 shows another embodiment of the inven-tion sche-
matically and in side view.
~ ccordincJ to Fig. 1, there extends Erom the cylinder
1 the piston rod 2 whose reciprocating mo-tion is transmitted via
a kinematic system (not shown) to the tube winch of a sprinkling
machine and thereby causes the take-up of the tube in an inter-
mitten-t manner~ The piston rod 2 carries a mounting 3, fixedly
secured thereto, from which a driving cord 4 passes around a
30 roller 5, mounted on the cylinder 1, to a restoring spring 6
which is fixedly anchored at one end. When the piston rod 2
moves in one or the other direction according to the double-

headed arrow 7, the roller 5 is also entrained synchronously withthis motion in one or the other sense of rotation. The shaft 8
of roller 5 leads directly or indirectly to a tachometer whose
scale layou-t is represented in Fig. 2. At s-tandstill the pointer
9 is in its middle position. As soon as the piston rod 2 moves,
the pointer 9 is deflected to the riyht or -to the lef-t and remains
during the constant par-t of the piston stroke in a cons-tant de-
flection position, e.g. 10' or 10"; with each maximum deflection
the pointer 9 remains stationary for several seconds in its in-
10 dica-tlng position so as to afforcd sufficient readability for
the user.
The tachometer scale is furthermore so designed that
the reading associated with the current position can also be
carried out in dependence upon the current tube length ~the tube
is being wound on the drum in several layers). Moreover, the
scale layout takes into account the fact the the motion is inter-
mittent and indicates in its reading the mean value of the moving
phase and the intervening quiescent phase as required for deter-
mining the time.
According to Fig. 3 the invention can also be achieved
with a rack 11 which is fastened to the piston 2 and meshes wi-th
a pinion 12 which is connec-ted with -the tachometer (not shown)
either directly or by way oE a speed-chancJing transm:Lssion.