DE1248794B

DE1248794B -

Info

Publication number: DE1248794B
Application number: DEF45852A
Authority: DE
Publication date: 1967-08-31

Description

FEDERAL REPUBLIC OF GERMANY

DEUTSCHESGERMAN

PATENTAMTPATENT OFFICE

EDITORIAL

Int. Cl.:Int. Cl .:

GOI rGOI r

German class: 21 e - 26

Nummer 1248 794Number 1248 794

File number: F 45852IX d / 21 e Registration date: April 17th. 1965 Opened on August 31, 1967

Die Erfindung betrifft eine Vorrichtung zur Rückstellung eines über eine Rutschkupplung verstellbaren Meßpotentiometerschleifers in die Nullstellung. Eine solche Vorrichtung ist vor allem bei Integrationseinrichtungen erforderlich, bei denen der Meßpotentiometerschleifer von einem Meßmotor verstellbar ist, der von einer zu integrierenden Spannung gespeist wird. Die Drehzahl des Meßmotors ist proportional der angelegten Spannung, und der Stellweg und damit die Stellung des Potentiometerschleifers sind somit proportional dem Zeitintegral dieser Spannung. Dieses Zeitintegral kann an einem mit dem Potentiometerschleifer gekuppelten Zeiger angezeigt werden. An dem Potentiometerschleifer erhalt man eine Spannung, welche dem Zeitintegral der Eingangsspannung proportional ist. Eine solche Anordnung ist in F i g. 1 dargestellt. Bei solchen und ähnlichen Anordnungen ist es erforderlich, den Schleifer nach Beendigung des Meßvorganges in die Nullstellung zurückzuführen. Es ist dabei wesentlich, daß der so Schleifer des Meßpbtentiometers sehr genau und prellfrei auf den Anfang der Widerstandswicklung zurückgestellt wird, da besonders für Positionierungsaufgaben, bei Integrationsmeßeinrichtungen für Bandwaagen und Mehrkomponentensteuerungen die es Nullstellung des Schleifers die Messung am Anfang des Meßbereiches erheblich beeinflußt.The invention relates to a device for resetting a device which is adjustable via a slip clutch Measuring potentiometer wiper in the zero position. Such a device is mainly used in integration facilities required, where the measuring potentiometer wiper can be adjusted by a measuring motor, which is fed by a voltage to be integrated. The speed of the measuring motor is proportional the applied voltage, and the travel and thus the position of the potentiometer wiper thus proportional to the time integral of this voltage. This time integral can be adjusted with the potentiometer slider coupled pointers are displayed. You get one on the potentiometer wiper Voltage which is proportional to the time integral of the input voltage. Such an arrangement is in Fig. 1 shown. With such and similar arrangements it is necessary to adjust the grinder Completion of the measuring process to be returned to the zero position. It is essential that this is the case Grinder of the measuring potentiometer very precisely and bounce-free on the beginning of the resistance winding is postponed because especially for positioning tasks, with integration measuring devices for Belt scales and multi-component controls which it zeroing the grinder at the beginning of the measurement the measuring range is significantly influenced.

Eine bekannte Vorrichtung zur Rückstellung eines Meßpotentiometerschleifers in die Nullstellung weist eine herzförmige Scheibe in Verbindung mit einem schlagartig wirkenden Zugmagneten auf. Eine solche Rückstellungsvorrichtung hat den Nachteil, daß nicht mit Sicherheit der einmal einjustierte Nullpunkt erreicht wird, weil die auf die Scheibe wirkende Kraft gerade in der Gegend des Nullpunktes am geringsten ist. Außerdem treten durch die schlagartigen Bewegungen Beschleunigungen auf, die im Laufe der Zeit zur Verformung der einzelnen Bauteile führen und dadurch ebenfalls Abweichungen vom einjustierten Nullpunkt verursachen.A known device for resetting a measuring potentiometer wiper to the zero position has a heart-shaped disc in connection with a suddenly acting pull magnet. Such Resetting device has the disadvantage that the zero point that has been adjusted once is not reached with certainty because the force acting on the disk is lowest in the area of the zero point is. In addition, the sudden movements cause accelerations that over time lead to the deformation of the individual components and thus also deviations from the adjusted Cause zero point.

Der Erfindung liegt daher die Aufgabe zugrunde, nach Beendigung der Messung den Meßpotentiometerschleifer sehr genau und prellfrei auf die Nullstellung zurückzustellen, wobei natürlich während der Messung selbst die Verstellung des Meßpotentiometerschleifers durch die Rückstellmittel nicht beeinträchtigt werden darf.The invention is therefore based on the object of the measurement potentiometer wiper after the measurement has ended very precisely and bounce-free to reset to the zero position, with of course during the measurement itself does not affect the adjustment of the measuring potentiometer wiper by the resetting means may be.

Zur Lösung dieser Aufgabe sieht die Erfindung vor, daß die Rückstellung mittels eines Rücksteilmotors erfolgt, welcher über ein ein- und ausrückbares Kupplungsglied an dem Meßpotentiometerschleifer angreift, und daß das Kupplungsglied vonTo solve this problem, the invention provides that the reset by means of a reverse motor takes place, which via an engaging and disengageable coupling member on the measuring potentiometer wiper attacks, and that the coupling member of

Potentiometer wiper reset

Anmelder:Applicant:

Fernsteuergeräte Zachariä - Oelsch - Meier,
Berlin, Jahnstr. 68-72Remote control devices Zachariä - Oelsch - Meier,
Berlin, Jahnstr. 68-72

Als Erfinder benannt:
Franz Meier,
Hans Pauli,Named as inventor:
Franz Meier,
Hans Pauli,

DipL-Ing. Alois Lennartz, Berlin

dem RückStellmotor bei dessen Anlaufen selbsttätig gegen die Wirkung einer Rückholfeder in die eingerückte Stellung gebracht wird. Es erfolgt also eine stetige und genaue Rückstellung mittels eines gesonderten Rücksteilmotors, welcher nach Beendigung der Messung eingeschaltet wird. Mit der Einschaltung kuppelt sich der Rücksteilmotor selbsttätig an den Potentiometerschleifer an. Nach Abschalten des Motors wird die Kupplung selbsttätig unter dem Einfluß der Rückholfeder wieder gelöst, so daß bei der Messung bei abgeschaltetem Rückstellmotor der Potentiometerschleifer frei verdrehbar ist.the return motor when it starts up automatically against the action of a return spring in the engaged Position is brought. There is therefore a constant and precise reset by means of a separate one Reverse motor, which is switched on after the measurement is finished. With the activation the reverse motor automatically couples to the potentiometer wiper. After switching off the engine the clutch is automatically released again under the influence of the return spring, so that during the measurement When the reset motor is switched off, the potentiometer slider can be freely rotated.

Die Erfindung könnte in verschiedener Weise konstruktiv gelöst werden. Eine besonders einfache und vorteilhafte Lösung besteht darin, daß das Kupplungsglied eine auf der Welle des Rücksteilmotors gelagerte und von diesem über eine Rutschkupplung 12 verschwenkbare Schwinge ist, an welcher Ritzel gelagert sind, von denen eines mit einem auf der Motorwelle sitzenden Zahnrad im Eingriff ist und das andere in der eingerückten Stellung mit einem Zahnrad auf der Achse des Potentiometerschleifers in Eingriff kommt Das Kupplungsglied kann dabei einen Teil eines Untersetzungsgetriebes zwischen RückStellmotor und Potentiometerschleifer bilden. Vorteilhaft ist dann weiterhin das letztere Zahnrad mit der Achse des Potentiometerschleifers über eine Rutschkupplung gekuppelt, deren übertragenes Drehmoment merklich größer ist als das der Rutschkupplung, über die bei der Messung dieVerstellung des Meßpotentiometerschleifers erfolgt. Der Rückstellmotor bringt dann den Schleifer prellfrei an den Anschlag, worauf die Rutschkupplung zwischen Zahnrad und Schleiferachse nachgibt. Die letztere Rutschkupplung ist so ausgelegt, daß sie ein größeres Dreh-The invention could be achieved constructively in various ways. A particularly simple and An advantageous solution is that the coupling member is one on the shaft of the reverse motor mounted and pivotable by this via a slip clutch 12 is on which pinion are stored, one of which is in engagement with a gear seated on the motor shaft and the others in the engaged position with a gear on the axis of the potentiometer wiper in engagement The coupling member can be part of a reduction gear between the reverse actuator and form potentiometer sliders. The latter gear with the is then still advantageous The axis of the potentiometer grinder is coupled via a slip clutch, its transmitted torque is noticeably larger than that of the slip clutch, via which the adjustment of the Measuring potentiometer wiper takes place. The reset motor then brings the grinder to the stop without bouncing, whereupon the slip clutch between the gearwheel and the grinder axis gives way. The latter slip clutch is designed so that it has a larger rotary

709 639/208709 639/208

Claims

torque can be transmitted as the slip clutch, which is used to adjust the potentiometer slider during the measurement. Then it can give way during the resetting process, while the slip clutch between the gear wheel and the grinder axis still reliably transmits the resetting movement. An embodiment of the invention is shown in FIGS. 2 and 3 and described below. Fig. 2 is a side view of a device according to the invention; Fig.3 is a section along line B of Fig. 2 adjusted stop turned back to the zero position. The slip clutch between gear 2 and axle 4 gives way, while the movement is still properly transmitted via clutch 6. A coupling between gear 2 and axle 4 is necessary because the large gear ratio of gear 2 makes it impossible to rotate the gear shaft. When the grinder reaches the stop in the zero position, the slip clutch 6 gives way. The motor 7 is then switched off. Under the influence of the spring 13, the rotor of the motor 7 with the rocker 11 then rotates back into the disengaged position shown, so that the grinder can again be used for a subsequent measurement. a gear 2 and a - not visible - slip A synchronous motor was used because it warkupplung the wiper of a measuring potentiometer 3 is maintenance-free and drives with the generally usual 50 Hertz. It can be an integration process. A second return spring direction according to FIG. 1 act. The purpose of axis 4 of 14 is to ensure that the self-measuring potentiometer 3, on which the potentiometer-starting synchronous motor always slides in one direction, is led out of the potentiometer upwards. A gear 5 sits on the axis 4 of the potentiometer grinder. A slip clutch 6 is arranged between gear S and axis 4. The maximum transmitted torque of the slip clutch 6 is in the ratio of about 2: 1 to that of the slip clutch between gear 3 and axle 4. In a practical embodiment of the invention, the slipping clutch 6 transmits a maximum torque of about 10 ρ, while the slipping clutch between the gear 3 and the grinder axis 4 transmits about 5 ρ · cm. A gear 9 is seated on the shaft 8 of the motor 7. The gear 9 is in engagement with a pinion 10 a, which is connected to a second RitzellOfe. The RitzellOa and 106 are in a fescue! mounted The rocker arm 11 is in turn mounted on the motor shaft 8 and coupled to it by a slip clutch 12. The rocker 11 is under the influence of a return spring 13 which seeks to keep the rocker 11 in the disengaged position shown in FIGS. If the motor 7 is switched off during the measurement, the state of FIG. 2 and 3. The resetting means do not in any way affect the setting of the measuring potentiometer wiper by the measuring motor 1. After the measurement is complete, the resetting motor 7 is switched on. The shaft 8 now initially takes the rocker with it via the slip clutch 12. This is pivoted counterclockwise in FIG. 3 until the pinion 106 comes into engagement with the gear 5. This limits the pivoting movement of the rocker arms, and the slip clutch 12 yields. Via the .. The grinder is then bounce-free up to a precise start. Patent claims: »5 30 35 40

1. Device for resetting a measuring potentiometer grinder which can be adjusted via a slip clutch into the zero position, characterized in that the reset is carried out by means of a reverse motor (7), which Via a clutch element (10 a, 106, 11) that can be engaged and disengaged on the measuring potentiometer wiper attacks, and that the coupling member (10 a, 10 6,11) of the reverse engine (7) in its Starting automatically brought into the engaged position against the action of a return spring (13) will.

2. Apparatus according to claim 1, characterized in that the coupling member has a the shaft (8) of the reverse actuator (7) and from this via a slip clutch (12) pivotable rocker (11) is on which pinions (10 a, 106) are mounted, one of which with a seated on the motor shaft gear (9) is in engagement and the other in the engaged Position with a gear (5) on the axis (4) of the potentiometer wiper in engagement comes.

3. Apparatus according to claim 2, characterized in that the latter gear (5) with the axis (4) of the potentiometer wiper is coupled via a slip clutch (6) whose transmitted torque is noticeably greater than that of the slipping clutch over which the measurement the adjustment of the measuring potentiometer wiper takes place.

4. Apparatus according to claim 3, characterized in that the measuring potentiometer grinder can be adjusted in a manner known per se by a measuring motor which is fed by a voltage to be integrated (JJ _x ).

1 sheet of drawings

709 639/208 8.67 Q Bundesdruckerei Berlin