DE113579C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

GREAT

Patented in the German Empire on December 17, 1898.

The methods used to this day to change the circulation rate of flat regulators during the course have for the most part the disadvantage that with the change of the Speed also changes at the same time the degree of irregularity of the flat controller. Further is by moving the device causing the change in the number of revolutions, too during the activity of the regulator itself, its sensitivity and externally effective Working capacity usually adversely affected.

The subject of the present invention is an arrangement which has the above-mentioned inconveniences avoids.

For this purpose, the point of application of the regulator spring on the lever of the flywheel shifted in the direction of the fulcrum and the motion transmission necessary for this shift by a chain concerned.

First of all, the essence of this flat regulator is to be seen on the basis of the schematic FIGS. 1 to 3 iri accompanying drawings.

With a flat regulator, the number of the equilibrium position is determined by simply tensioning the spring The number of revolutions required is increased, the controller becomes unstable if astatic equilibrium was chosen as the basis, because the moments of the swing weight are proportional to the sine of the deflection angle.

So it is:

the moment for α ¹
the moment for α ²

M ₁

C ■ sin α '

M ₂ = C -sin α ² .

For an increased number of revolutions, C grows and becomes C ¹ .

It is then:

the moment for α ^l M \ = C ^l sin α ^l , the moment for a ² M ₂ - = C ¹ sin & ² .

The difference between the moments is therefore:

for the first case:

M ₂ - M ₁ = C (sin α ² --sin ix ¹ ), for the second case:

M ^l ₂ -M \ = C ¹ (sin α ² -sin α ¹ ).

Since C ^{1 is} greater than C , it follows that the increase in torque is greater in the second case than in the first.

The spring moments that keep these moments in equilibrium are, however, for the first case:

M ₁ = F ₁ T ₁ corresponding to the angle α ¹ , M ₂ = .F ₃ r ₂ corresponding to the angle α ² .

If the spring tension is now increased by the amount F - {&. Fig. 1) increases, the moments for the second case are:

M \ = (F ₁ + F) r _x - M ₂ - = (F ₂ + F) r ₂ , '

and if T ₁ = T ₂ (with perfectly symmetrical deflection), then we get:

M [ = (F ₁₊ F) T ₁ , M \ = (F ₂₊ F) T ₁ .

The torque increase in the first case is:

M ₂ -M ₁ = F ₂ T ₂ -F ₁ K ₁ = T ₁ (F ₂ - F ₁ ) .;

in the second case:

M ^l ₂ - M \ -F ₂ F ₁ ^ Fr ₁ -F ₁ T ₁ -Fr ₁ = r, (F ₂ -F ₁ ).

The increase is therefore zero, only the weight moments alone have increased and therefore the controller is unstable in the second case.

On the other hand, it only becomes a position of equilibrium by enlarging the spring engagement lever arm If the required number of revolutions increases, the moments of the flyweights are still obtained with:

M ₁ = C sin α ^l ,
M \ = C sin α ²
C.

M ₂ = C sin α ² , M ₂ = C ¹ sin α ² ,

M ₂ -M ₁ - C (sin α ² -sin α ¹ ), M \ -M \ = C ¹ (sin α ² -sin a ¹ ).

The spring moments are now quite symmetrical, if for the sake of a better overview Rash is assumed:

M ₁ = F ₁ T ₁ ; M ₂ = F ₂ T ₁ , M ₂ -M ₁ = r, (F ₂ -F ₁ ). _:

The new radius is now r {and the increase in the spring travel to each side of the middle position equal /; then:

Μ} = (F ₁ -Z) Tl- M ₂ = (F ₂ + Z) t1, M ₂ -Ml = r \ (F ₂ -F ₁ ) + Tl ₂ /.

From this it can be seen that the spring moments have also increased. This increase F ₂ - ■ F ₁ depends on the spring law. If this happens faster than the increase in the weight moments, it is only necessary to tension the spring at the same time as the increase in the radius, since the tendency to instability then compensates for the tendency towards stability and almost all of the imaginary number of revolutions gives completely equal stable regulator.

The simultaneous tensioning of the spring and moving its point of application is easy achieved by displacement in a direction inclined to the directional beam.

This differs the - present flat regulator from the Dörfel's flat regulator. In the former, the change in the number of revolutions takes place mainly through change of the attack lever arm and then by tensioning the spring, this tensioning the spring . only undertaken to achieve the same astasy and only when the law of the pen requires it will. This shift allows an extensive change in the number of revolutions can be achieved, as there are almost no limits to this shift.

In the Dörfel's flat regulator, on the other hand, the spring is mainly tensioned and at the same time set in order to achieve the same astasia, i.e. the position of the spring is changed in such a way that T ₁ > r ₃ for the low number of revolutions and low spring tension and T 1> r 3 for the higher number of revolutions and greater spring tension T ₁ <C rj, becomes. By changing the growth, the radius, the tendency to instability caused by the tensioning of the spring is compensated for. The mean radii themselves remain the same: strictly speaking, the mean lever arm for the more strongly tensioned spring is even smaller. The achievable change in the number of revolutions is therefore narrowly limited by the spring restriction, which is only possible within narrow limits, while with the present controller the change can be made within very wide limits.

The constructive implementation of this theoretically discussed task of the simultaneous displacement and tensioning of the spring can be done in different ways, as is apparent from Figures 4 through 9 of the drawings.

The same illustrate in Figs. 4 and 5 an embodiment of this device.

The spring pull rod α hangs with its eye on a bolt b, which is fastened in a swing arm d rotatably mounted in the lever of the swing weight c.

In the scroll-like upper part of the rocker d worm e engages which f by ^ the worm wheel, g the screw, h the sprocket and the chain i can be moved, characterized the rocker d rotates, and thus the spring engagement point with a slight deviation in the direction to the main bolt k moves.

The chain wheels m and /, which are provided with toothed rings at the same time, are used to move the chain i and thus mesh with the toothed wheels η and 0.

The latter, η and 0, are each firmly connected to a handwheel ρ and q. The chain roller r, which can be moved in an elongated slot in the regulator drum, is used to re-tension the chain. :

If one of the two handwheels ρ or q is held while the machine is in motion, then, as can be seen, the chain, and thus the swing arm with the spring contact point through the intermediate gear ^{, is moved} in one sense or the other and thereby 'the number of revolutions of the controller, as a result of the change in the spring torque, changed.

By using the flexible chain, the play of the controller itself is not disruptive influences.

In the second embodiment shown in Fig. 6, the rocker is omitted and by a, by the screw spindle e displaceable nut block d, which in the two plates of the swing weight

hebeis c is replaced. In the nut block d , the bolt b is attached, on which the spring pull rod α engages.

The drive of this screw spindle e takes place exactly in the manner indicated in FIGS.

In the case of larger controllers, where the hand force would no longer be sufficient to operate the handwheels, brake wheels s and t can be attached in their place in the manner shown in FIG. 7, which can be held by a lever, disc or band brake.

7 also shows a second arrangement of the reversing gear. The two gears m and / are widened beyond the edge of the gears η and 0 and mesh with one another, so that the chain i can receive both movements through the chain wheel m, which is well spanned by the chain, while the Chain wheel / in this case only runs as a guide roller.

The brake lever or the brake discs to be able to from a remote places from bethätigen can, indicated 9 in FIG. 8 and, solenoids, a ¹ and be applied b ^1, by tightening their armature e ^{is 1} or f ¹ due to current circuit in g the brake lever c ¹ respectively associated with the armature. Press down on d ^{l to} hold the brake wheels.

Claims (1)

Patent Claims: Flat regulator with variable number of revolutions during the course, at which the moving spring application point is shifted approximately in the direction of the radius for the purpose of almost complete maintenance of the irregularity, that with the enlargement of the engagement lever arm achieved by the shift, the tension of the spring is increased at the same time as required.
Flat regulator according to Claim 1, in which the drive of the movement mechanism from the shaft to the fulcrum is effected by a chain in order to achieve a flexible, movable transmission.
Flat governor according to Claim 1, in which the brake wheels attached to the shaft to impart the movement can also be braked from a remote point by means of electromagnets. 1 sheet of drawings.