Weighing system having an astatic lever

Abstract

The invention relates to a weighing system (10), comprising - a base (12), - a load cell (14) coupled to the base (12) by means of a parallel link arrangement, - a transmission lever (24) which is pivotably coupled to the base (12) by means of a transmission lever joint (25), the first transmission lever arm (241) of which transmission lever is connected to the load cell (14) via a load coupling strap (28) and the second transmission lever arm (242) of which transmission lever bears at least one element of an electromagnetically compensatory sensor arrangement (26), and - an astatic force generating element which is fixed on one side to the base (12) and by means of which an astatic force which can be introduced into an introductory point (32) of the transmission lever (24) can be generated. The invention is distinguished by an astatic lever (36) which is pivotably coupled to the base (12) by means of an astatic lever joint (40) and the first astatic lever arm (361) of which astatic lever is connected to the introductory point (32) via an astatic coupling strap (34) and the second astatic lever arm (362) of which astatic lever is operatively connected to the astatic force generating element.

Description

[0001] Weighing system with astasis lever

[0002] Description

[0003] Field of the invention

[0004] The invention relates to a weighing system comprising

[0005] - a base,

[0006] - a load receiver connected to the base by means of a parallel link arrangement,

[0007] - a transmission lever pivotally connected to the base by means of a transmission lever joint, the first transmission lever arm of which is connected to the load receiver via a load coupling band and the second transmission lever arm of which carries at least one element of an electromagnetic compensatory sensor arrangement, and

[0008] - an astasis force generating element fixed to one side of the base, by means of which an astasis force can be generated that can be introduced into an introduction point of the transmission lever.

[0009] State of the art

[0010] Gravimetric measuring devices, i.e. weighing devices, operating according to the principle of electromagnetic compensation have long been known to those skilled in the art. For example, EP 2 690415 A1 discloses such a weighing device.

[0011] The basic principle is that the deflection of a load receptor caused by the weight of a load relative to a base is measured by means of a

[0012] The force and displacement of the transmission lever are transmitted to a sensor, which in turn exerts an electromagnetic force on the lever arm that opposes the deflection. This compensating force depends on the current supplied to the coil of a plunger coil arrangement that generates the compensating force. If the current is selected such that the load-induced deflection of the transmission lever is precisely compensated, thus ensuring that the lever arm remains in its equilibrium position despite the applied load, the compensating current represents an exact measure of the required compensating force and therefore of the weight of the applied load.

[0013] Technically, such a system is usually implemented as follows: By means of a parallel link arrangement, the so-called load receptor, to which a load holder can be or can be coupled, is articulated to a fixed base. As a result, its degrees of freedom of movement are limited to a largely vertical, tilt-free movement when the weighing device is correctly set up - at least for small deflections. The load receptor is articulated to a transmission lever, in particular to its lever arm on the load receptor side, via a so-called coupling band. A coupling band is understood here to be a predominantly elongated coupling that is flexible in predominantly only one bending direction. A thin sheet metal strip is frequently used for this purpose, which often has thin spots in the material near its end fixing points, so that the band, which is already predominantly only one-dimensionally flexible due to its shape, is effectively articulated at its fixing points.The transmission lever is pivotally mounted on a lever joint fixed to the base, referred to here as the transmission lever joint. The bearing point represents the boundary between the load-carrying lever arm, referred to here as the first transmission lever arm, and the sensor-side lever arm, referred to here as the second transmission lever arm. The coil of a moving coil arrangement is usually fixed to the end of the sensor-side lever arm. It is immersed in the magnetic field of a base-fixed, usually pot-shaped magnet, usually a permanent magnet. Reversed arrangements with a base-fixed coil and a lever-fixed (permanent) magnet are also conceivable but uncommon. The position of the transmission lever in a given reference load situation (usually unloaded for conventional scales, loaded for comparators) represents its equilibrium position.This can be detected using a separate position sensor, which usually operates according to an optical principle, or the lever can be adjusted so that, in the reference load situation, it is in a position interpreted by the position sensor as an equilibrium position. When the coil is energized, a magnetic field corresponding to the coil current is generated, which interacts with the magnetic field of the permanent magnet, resulting in a force acting on the sensor-side lever arm. Conversely, placing a load on the load sensor leads to a mechanical force acting on the load sensor-side lever arm. Using a suitable control system, such a device can be operated so that every (infinitesimal) load-related deflection of the transmission lever is detected by the position sensor and converted into a compensatory change in the coil current.In this way, the transmission lever remains in its equilibrium position (apart from infinitesimal deflections), whereby the current flowing through the coil at the end of a transient process is representative of the load placed on the load receptor, the weight of which can be determined with high precision by appropriate measurement of the coil current.

[0014] The mechanical part of this complex system is often referred to in technical jargon as a weighing system. These are highly precisely manufactured, often monolithic devices which, despite the use of highly developed precision technology, can exhibit deviations from an ideal system. In particular, the so-called stiffness of the joints in such a weighing system represents such a deviation from the ideal system. Stiffness is the restoring force that a real joint (as opposed to an ideal joint) opposes to its deflection. As a rule, it is not possible to define the equilibrium position of the transmission lever as the position in which the transmission lever joint is exactly undeflected, i.e. in which no stiffness-related torque acts. Instead, a slightly deviating lever position is normally defined as the equilibrium position using the position sensor.Any coil current in the moving coil arrangement required to maintain this equilibrium position against a stiffness-related torque is treated below as an offset current. In this context, one speaks of "taring" the scale. However, a further deviation from the ideal system lies in the finite resolution with which the position sensor can detect the position of the transmission lever, in particular its equilibrium position. A deviation from the defined equilibrium position below this resolution limit therefore leads to a stiffness-related torque that is not compensated for by the taring, and which is added - positively or negatively - to the torque caused by the weight of the weighing object. The size of this "error" torque is - for a given position deviation of the transmission lever - dependent on the actual joint stiffness. With the so-calledAstasis attempts to minimize the steepness of this essentially linear dependence so that the real deviations from the defined equilibrium position, which are unavoidable due to the finite position sensor resolution, lead to the smallest possible error torque.

[0015] Various stabilizing measures are known to those skilled in the art. One known stabilizing measure, for example, is to design the transmission lever so that its center of gravity lies above the lever joint, i.e., above its exact pivot axis. This leads to a destabilization of the equilibrium position of the transmission lever: Due to the raised center of gravity, every deflection of the lever leads to a torque that increases the deflection. This counteracts the inverse stiffness torque of the lever joint. Conversely, stabilization can be achieved by shifting the lever's center of gravity below its pivot axis. The disadvantage of this approach is that both the joint stiffness and the center of gravity of the transmission lever are subject to manufacturing deviations and therefore only exactly compensate for one another in rare exceptional cases. In addition, the system is more sensitive to tipping.The person skilled in the art will recognize that relative orientation terms such as “above” or “over” and “below” or “under” are to be understood here in the context of a proper alignment within the framework of a functioning scale.

[0016] A similar result, but less prone to tipping, is achieved by a principle known from the aforementioned, generic EP 0359 978 B1, in which the transmission lever, above its lever joint, carries a coupling point for one end of a tension spring, the other end of which is fixed to the base, so that the tension spring is tensioned vertically over the transmission lever joint. This applies a force to the transmission lever acting vertically from top to bottom and passing through the transmission lever joint. This force is introduced into the transmission lever via the spring coupling point, which acts as the introduction point for the astasis force. The mechanical implementation of this principle, still considered extremely advantageous, disclosed in this approximately 35-year-old publication is no longer compatible with modern, extremely high-resolution scales.In particular, it would be desirable to be able to reduce the force acting on the transmission lever joint in the equilibrium position in order to prevent material flow in the area of ​​the joint, which is typically designed as an extremely delicate, thin point. Furthermore, the direction of the spring force of the tension spring, which is designed as a helical spring, cannot be reproduced so precisely that it always runs exactly through the pivot axis of the transmission lever, which would be necessary for modern, high-resolution scales.

[0017] Task

[0018] It is the object of the present invention to provide a mechanical implementation of the astasis principle known from the generic document that is compatible with modern weighing systems.

[0019] Description of the invention

[0020] This object is achieved in conjunction with the features of the preamble of claim 1 by a astasis lever pivotally connected to the base by means of a astasis lever joint, the first astasis lever arm of which is connected to the introduction point via an astasis coupling band and the second astasis lever arm of which is operatively connected to the astasis force generating element

[0021] Preferred embodiments are the subject of the dependent claims.

[0022] The basic idea of ​​the invention is to couple the astasis force generating element, preferably designed as a spring, in particular as a tension spring, not directly to the introduction point, but instead indirectly via an additional mechanism consisting of a astasis lever and astasis coupling band. By using the astasis coupling band, the direction of the astasis force acting on the introduction point can be defined much more precisely than if a tension spring, for example, designed as a helical spring, were coupled there. Furthermore, the redirection of the astasis force by means of the astasis lever allows for an extension of the entire force flow path and, in particular, an extension of its straight end section, which ends at the introduction point.The length of this end section of the force flow path is – for a given astatic force – crucial for the strength of the astatic torque that builds up when the transmission lever is deflected from its equilibrium position. Conversely, the greater the torque that can be achieved with a given force, the lower the force required to achieve the desired astatic torque can be. Reducing the astatic force introduced at the point of introduction, in turn, results in reduced loading of the transmission lever joint in the equilibrium position of the transmission lever. The risk of material flow in the delicate transmission lever joint due to the continuous loading exerted by the astatic force, e.g., in the form of a spring force, is correspondingly lower.With the same installation space and the same desired astasis torque, the indirect introduction of the astasis force according to the invention allows a more delicate design of the weighing system, which benefits its sensitivity and therefore the resolution of a corresponding scale.

[0023] As already indicated, in the weighing system according to the invention, the astasis force-generating element is preferably designed as a spring, in particular as a tension spring. The first end of the spring is fixed to the base, and its second end to the second astasis lever arm. This fixation can be a linkage. However, the spring will generally be sufficiently flexible to compensate for the tiny deviations from a purely linear movement of the second astasis lever arm end that occur during the expected small deflections of the astasis lever. At the other, first astasis lever arm, compensation is achieved through the properties of the coupling band, whose flexibility is precisely defined or limited by its shape.

[0024] As is known from the prior art, the introduction point for the astasis force is preferably located above the transmission lever joint or the pivot axis defined by it. When a tensile force generated beyond the rotational axis is used as the astasis force, this leads to a destabilizing effect. In other words, such an embodiment counteracts the material and shape-dependent rigidity of the transmission lever joint. If a stabilizing effect of the astasis is desired in individual cases, the introduction point can instead be located below the transmission lever joint or the pivot axis defined by it in appropriate embodiments.

[0025] Advantageously, the introduction point is axially colocated with the transmission lever joint or the pivot axis. The direction "axial" refers to the longitudinal extension of the transmission lever. In this description and for analogous situations, the shortened formulation "lever-axial" is used for this purpose. With an exactly horizontal alignment of the transmission lever in its equilibrium position, the introduction point is preferably arranged exactly vertically above the pivot axis. The point at which the lever-side end of the astasis coupling band is fixed to the astasis lever should be located as exactly as possible in extension of the connecting line between the introduction point and the transmission lever pivot axis, thus in the usual embodiment exactly vertically below the transmission lever pivot axis.However, especially when using a long coupling band, the accuracy of the position of this fixation point is less critical than the accuracy of the positioning of the introduction point relative to the transmission lever joint. However, as long as the transmission lever joint is capable of supporting non-vertical forces, the line of action of the astasis force may also be oblique or even perpendicular to the vertical distance between the rotation axis and the lever's longitudinal extension. In any case, however, it should intersect the rotation axis as precisely as possible.

[0026] Particularly in cases where the initiation point is located above the transmission lever joint, it is advantageous if the astasis coupling band is guided between two legs of the transmission lever, which has two laterally spaced legs at least in the area of ​​the transmission lever joint. The functional transmission lever joint is then divided into two spaced-apart, structural joints, preferably thin material sections, which together form the pivot axis for the transmission lever. Between these two structural joints or thin material sections, each of which connects one of the parallel legs of the transmission lever to the base, there is sufficient space to allow the astasis coupling band to run through the transmission lever to the astasis lever.

[0027] Despite highly developed manufacturing techniques, particularly in the precision milling of monolithic weighing systems, minor manufacturing tolerances can occur, which also affect the aforementioned relative positioning of the introduction point and the transmission lever joint. To compensate for this, a further development of the invention provides for the introduction point to be axially adjustable with respect to the longitudinal extension direction of the transmission lever. In other words, in such an embodiment, the introduction point is arranged so that it can be displaced in the longitudinal extension direction of the transmission lever. This allows manufacturing tolerances to be compensated for in individual cases by appropriate adjustment to ensure that the introduction direction of the astatic force runs precisely through the transmission lever joint or the pivot axis of the transmission lever.

[0028] Such an adjustment mechanism, which should be capable of compensating for deviations in the micrometer or even sub-micrometer range, is not trivial. One of various mechanical possibilities is considered to be that the introduction point is arranged on a sliding block that is axially movable with respect to the longitudinal direction of the transmission lever, and that the sliding block is indirectly subjected to a force against a stop rigidly connected to the transmission lever via a wedge that is adjustable transversely to the longitudinal direction of the transmission lever. A displacement of the wedge transversely to the axial direction of the transmission lever therefore leads to a change in the distance between the edge of the sliding block resting on the wedge and the stop fixed to the lever. When the wedge is retracted, the axial force acting on the sliding block pushes it towards the stop.When the wedge is driven forward, however, the distance increases against the force acting on the sliding block. The displacement of the wedge can be achieved, for example, by an adjusting screw with a fine thread. The force applied to the sliding block can be achieved, for example, by a spring. Often, however, the inherent elasticity of the material, usually an aluminum alloy, is sufficient to be able to follow the tiny displacements of the sliding block required for adjustment. Alternatively or additionally, it can be provided that the entire astasis lever is displaceable relative to the base, or at least the fixing point to which the astasis coupling band is fixed to the first astasis lever arm, is designed to be displaceable relative to the astasis lever, and in fact - with respect to the astasis lever - axially displaceable.Such a displacement can also influence the inclination of the astasis coupling band and, in particular, adjust it so that it, or the line of action of the astasis force transmitted via it, runs exactly through the rotational axis of the transmission lever. The displacement of the entire astasis lever can be achieved, in particular, by displacing its astasis lever joint using a suitable displacement mechanism mounted on the base. The isolated displacement of the astasis coupling band fixing point can be achieved using a suitable displacement mechanism mounted on the astasis lever. Compared to the previously described variant of displacing the introduction point relative to the transmission lever, such embodiments even have the advantage that the adjustment is less sensitive and therefore fundamentally easier to implement mechanically.The reason for this is the typically larger distance between the rotational axis of the transmission lever on the one hand and the initiation point or the fixing point of the astasis coupling band on the astasis lever on the other. In practice, however, the installation space in the area of ​​the astasis lever is limited and / or difficult to access, so that an adjustment option located here encounters handling difficulties.

[0029] Advantageously, the strength of the astasis force is adjustable—if necessary, too. In the preferred case of the astasis force-generating element being designed as a spring, particularly a tension spring, this can be achieved by adjusting the spring's fixing position at the base in the direction of the spring's force action. In other words, the spring's preload is varied. This allows, in particular, manufacturing tolerances of the spring and the joints themselves to be compensated.

[0030] Further details and advantages of the invention will become apparent from the following specific description and the drawings. Brief Description of the Drawings

[0031] They show:

[0032] Figure 1: a highly schematic representation of an inventive

[0033] weighing system,

[0034] Figure 2: an enlarged view of the transmission lever joint of the

[0035] Weighing system of Figure 1 in schematic side view and

[0036] Figure 3: an enlarged view of the transmission lever joint of the

[0037] Weighing system of Figure 1 in schematic front view.

[0038] Description of preferred embodiments

[0039] The same reference symbols in the figures indicate the same or analogous elements.

[0040] Figure 1 shows a highly schematic side view of a weighing system 10 according to the invention. The base 12 of the weighing system 10, often referred to in technical jargon as the "mainland" or "system carrier," is merely indicated in the figures. The weighing system 10 has a Roberval mechanism, by means of which a load receiver 14 is articulated to the base 12 via two parallel links 16a, 16b. Both parallel links 16a, 16b are articulated to the base 12 on the one hand and to the load receiver 14 on the other hand by means of joints referred to here as Roberval joints 18, preferably designed as thin material sections. The load receiver 14 is connected to a weighing load carrier 20; in the illustrated embodiment, this connection is made via a cantilever arm 22.

[0041] The weighing system 10 further comprises a transmission lever 24, which is constructed from a first transmission lever arm 241 on the load-carrying side and a second transmission lever arm 242. The boundary between the first and second transmission lever arms 241, 242 is located axially at the level of a transmission lever joint 25, which is preferably designed as a thin material point and by means of which the transmission lever 24 is pivotally connected to the base 12. At its free end, the second transmission lever arm 242 carries components of a sensor arrangement 26. In the illustrated case, this is, on the one hand, the plunger coil 261 of an electromagnetically compensatory sensor that also comprises a pot magnet 262 fixed to the base. Furthermore, the second transmission lever arm 242 carries the target 263 of an optical position sensor (not otherwise illustrated).

[0042] The free end of the first transmission lever arm 241 is connected to the load receiver 14 via a load coupling band 28. In particular, the load coupling band 28 can consist of a sheet metal strip having a coupling band joint 30 formed as a thin material point near each of its two ends.

[0043] In this respect, the weighing system according to the invention does not differ from known weighing systems for electromagnetically compensated scales (EMF scales) and corresponds to them even in terms of its basic functionality. A weighing object placed on the weighing object carrier 20 exerts a weight force on the load sensor 14, which tends to deflect vertically downwards. The force or the resulting deflection tendency is transmitted via the load coupling band 28 to the transmission lever 24, whose first transmission lever arm 241 tends to be pulled downwards and whose second transmission lever arm 242 tends to be pushed upwards. The deflection is detected by the optical position detector, and the coil 261 of the sensor 26 is energized with precisely enough current to completely suppress said deflection and, after a transient process, the transmission lever 24 is held in its equilibrium position.The compensation current required for this through the coil 261 is representative of the weight force exerted by the weighing object.

[0044] The special feature of the present invention concerns the specific method of introducing a static force into the transmission lever 24. The corresponding mechanism is shown in Figure 1 in a severely misaligned state for clarity. In Figures 2 and 3, however, it is shown in sections in its correct alignment.

[0045] Above the transmission lever joint 25 is an introduction point 32 that can be moved in the longitudinal or axial direction of the transmission lever 24. It is shown purely schematically in the figures on the upper leg of a cantilever arm. In practice, however, it will usually be located directly on the upper side of the transmission lever 24 itself. During operation, as shown in Figures 2 and 3, the introduction point 32 should be located exactly above the pivot axis formed by the transmission lever joint 25, or at least be capable of being brought into such a position by appropriate adjustment. This optimal adjustment is also referred to here as the axial colocalization of the introduction point and pivot axis. The introduction point 32 is connected via an astasis coupling band 34 to the first lever arm of an astasis lever 36, referred to here as the first astasis lever arm 361.Similar to the load coupling band 28, the astasis coupling band 34 is preferably designed as a sheet metal strip, which in the region of its ends carries a coupling band joint 38 designed as a thin material point. In the illustrated embodiment, the astasis lever 36 is arranged below the transmission lever 24 and is pivotally connected to the base 12 via an astasis lever joint 40, preferably designed as a thin material point. In particular, it is positioned such that the coupling point of its first astasis lever arm 361 with the astasis coupling band 34 lies largely exactly below the pivot axis of the transmission lever 24 formed by the transmission lever joint 25. However, this is not absolutely necessary - at least in cases in which the transmission lever joint 25 is also capable of supporting non-vertical forces.The second lever arm of the astasis lever 36, referred to here as the second astasis lever arm 362, is preloaded against the base 12 by a spring 42, which is designed here as a tension spring. In the illustrated embodiment, the tension spring 42 exerts an upward force on the second astasis lever arm 362.

[0046] With correct adjustment, as shown in Figures 2 and 3, this force is redirected by means of the astasis lever 36 and introduced into the introduction point 32 in such a way that the force acting on the transmission lever 24, in the equilibrium position of the transmission lever 24, runs exactly through the pivot axis defined by the transmission lever joint 25. It is therefore completely supported by the transmission lever joint 25. No torque acts on the transmission lever 24. However, if the transmission lever 24 is deflected from its equilibrium position, in particular by the weight of a weighing object placed on the weighing object carrier 20, the force flow line shifts and runs axially alongside the pivot axis.The transmission lever joint 25 then no longer fully supports the introduced astasis force and this results in an astasis torque that reinforces the weight-related deflection of the transmission lever 24 and counteracts an opposite, stiffness-related torque.

[0047] The only indirect introduction of the astasis force generated by the spring 42 via the astasis lever 36 and the astasis coupling band 34 has the advantage that the effective direction of the introduced astasis force is precisely defined in the area of ​​the transmission lever joint 25 – unlike if the spring 42 were directly coupled to the introduction point 32. As a result, the astasis effect is highly reproducible and, in embodiments such as the one shown, even precisely adjustable.

[0048] Figure 3 shows a frontal view of the section of the weighing system 10 shown in side view in Figure 2. In this preferred embodiment, the transmission lever 24 is designed, at least in the region of the transmission lever joint 25, in the form of two parallel legs 24a, 24b. In this embodiment, the transmission lever joint 25 is designed as two spaced-apart thin material sections 25a, 25b, which together define the pivot axis of the transmission lever 24. In this embodiment, the astasis coupling band 34 can run between the two legs 24a, 24b of the transmission lever 24 or the two thin material sections 25a, 25b of the transmission lever joint 25.

[0049] Of course, the embodiments discussed in the specific description and shown in the figures represent only illustrative embodiments of the present invention. In light of the disclosure herein, a broad spectrum of possible variations is available to those skilled in the art. In particular, variants are conceivable in which the spring 42 is designed as a compression spring instead of a tension spring and / or acts on the second astasis lever arm 362 in the opposite direction of action. It is also conceivable to arrange the introduction point 32 below, rather than above, the pivot axis of the transmission lever 24. This allows the skilled person to create the positive or negative astasis desired in the individual case. With regard to the specific mechanics of any axial adjustability of the introduction point 32, all known and possibly still-to-be-developed precision mechanical implementations are available to the skilled person.

[0050] List of reference symbols

[0051] 10 Weighing system

[0052] 12 Base

[0053] 14 load receptors

[0054] 16a upper parallel link

[0055] 16b lower parallel link

[0056] 18 Roberval joint

[0057] 20 weighing carriers

[0058] 22 cantilever

[0059] 24 gear levers

[0060] 24a Leg of 24

[0061] 24b Leg of 24

[0062] 241 first transmission lever arm

[0063] 242 second transmission lever arm

[0064] 25 Transmission lever joint

[0065] 25a Material thin spot of 25

[0066] 25b Material thin spot of 25

[0067] 26 Sensor arrangement

[0068] 261 plunger coil

[0069] 262 Pot magnet

[0070] 263 Target

[0071] 28 Load coupling band

[0072] 30 Coupling band joint

[0073] 32 Introductory point

[0074] 34 Astasis coupling belt

[0075] 36 Astasis lever

[0076] 361 first branching lever arm

[0077] 362 second branching lever arm

[0078] 38 Coupling band joint

[0079] 40 Astasis lever joint

[0080] 42 spring

Claims

Patent claims 1. Weighing system (10), comprising - a base (12), - a load receiver (14) articulated to the base (12) by means of a parallel link arrangement, - a transmission lever (24) pivotally connected to the base (12) by means of a transmission lever joint (25), the first transmission lever arm (241) of which is connected to the load receiver (14) via a load coupling band (28) and the second Transmission lever arm (242) carries at least one element of an electromagnetically compensatory sensor arrangement (26), and - an astasis force generating element fixed on one side to the base (12), by means of which a astasis force which can be introduced into an introduction point (32) of the transmission lever (24) can be generated, characterized by an astasis lever (36) which is pivotally connected to the base (12) by means of an astasis lever joint (40), the first astasis lever arm (361) of which is connected to the introduction point (32) via an astasis coupling band (34) and the second astasis lever arm (362) of which is operatively connected to the astasis force generating element.

2. Weighing system (10) according to claim 1, characterized in that the astasis force generating element is designed as a spring (42) whose first end is fixed to the base (12) and whose second end is fixed to the second astasis lever arm (362).

3. Weighing system (10) according to claim 2, characterized in that the spring (42) is designed as a tension spring.

4. Weighing system (10) according to one of the preceding claims, characterized in that the introduction point (32) is arranged above the transmission lever joint (25).

5. Weighing system (10) according to one of the preceding claims, characterized in that the introduction point (32) - with respect to the transmission lever (24) - is axially colocated with a pivot axis of the transmission lever (24) defined by the transmission lever joint (25).

6. Weighing system (10) according to one of the preceding claims, characterized in that the transmission lever (24) has, at least in the region of the transmission lever joint (25), two laterally spaced-apart legs (24a, 24b) and the astasis coupling band (34) runs between these two legs (24a, 24b).

7. Weighing system (10) according to one of the preceding claims, characterized in that the introduction point (32) is designed to be axially adjustable with respect to the transmission lever (24).

8. Weighing system (10) according to claim 7, characterized in that the introduction point (32) is located on a - with respect to the Transmission lever (24) - is arranged axially on this displaceable sliding block, which is indirectly subjected to force via a wedge adjustable transversely to the axial direction of the transmission lever against a stop firmly connected to the transmission lever.

9. Weighing system (10) according to one of the preceding claims, characterized in that the fixing point at which the astasis coupling band (34) is fixed to the first astasis lever arm (361) is designed to be axially displaceable relative to the astasis lever - with respect to the astasis lever (36).

10. Weighing system (10) according to one of the preceding claims, characterized in that the astasis lever joint (40) together with the astasis lever (36) is designed to be axially adjustable relative to the base (12) - with respect to the astasis lever (36).

11. Weighing system (10) according to one of the preceding claims, characterized in that the strength of the astasis force is adjustable.

12. Weighing system (10) according to claim 11, as far as related to one of the Claims 2 to 3, characterized in that the fixing position of the spring (42) on the base is adjustable in the direction of force action of the spring (42).

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