Measuring tape for elevator installations

Abstract

The invention relates to a measuring scale strip (10) for determining the position of an elevator car (42) in an elevator shaft (41), which measuring scale strip can be arranged vertically in the elevator shaft and preferably such that it extends across at least two building floors, comprising a strip-shaped main body (11) and a position code made of a ferromagnetic material, which position code can be read by a magnetic field sensor, the strip-shaped main body (11) being made of a textile material and the position code being inserted into the main body or applied to the surface of the main body (11).

Description

Technical Field

[0001] The invention relates to a measuring tape and / or a measuring transducer for determining the position of an elevator car in an elevator shaft and to a measuring system comprising the measuring tape. Background Art

[0002] Devices for detecting the position of elevator cars in elevator installations are known from the prior art. These devices are used to provide information about the current position of the elevator car along the elevator shaft and / or the associated elevator rails in the shaft. In addition to simple position encoders, such as shaft switches, which provide feedback about the current elevator car position at a predetermined position in the elevator shaft, there are also incremental position encoders that enable precise position determination at every position in the shaft.

[0003] For example, EP 3 231 753 teaches an elevator installation having a measuring tape arranged in the elevator shaft for determining the position of the elevator car in the elevator shaft. The measuring tape has an optical code, in particular a 2D code, in the form of a successive position pattern for length measurement. A sensor element is attached to the elevator car, comprising a light source and a sensor and a detection field for detecting the measuring tape and assessing the corresponding elevator car position. This measuring tape is typically implemented as a steel tape with an optical code embossed thereon and sealed with a plastic layer.

[0004] Fritz Kübler GmbH sells a system for detecting the position of an elevator car in an elevator shaft, in which a perforated steel tape is scanned by an optical sensor mounted on the elevator car. The tape has position coding in the form of drilled and / or oval holes, which are contactlessly scanned by a photoelectric barrier.

[0005] However, such optical systems have the disadvantage that they are more susceptible to failure if dust gets into the mechanics of the elevator system. Systems based on magnetic influence or induced alternating fields are also known, and in these systems a code is inserted into the steel tape or coupled to the steel tape in such a way that it can be influenced magnetically.

[0006] For example, DE 10 2004 043 099 A1 discloses a device for detecting the position of an elevator car. An electromagnetic alternating field is influenced by a magnet located at the elevator car. The magnet is inserted into a conductive rope that is tensioned parallel to the elevator rails. An evaluation unit located outside the elevator car detects the position of the elevator car by recording the deflection caused by the magnet at the elevator car.

[0007] EP 0 927 674 A1 discloses a read head fastened to an elevator car or a carrier for evaluating a magnetically coded tape stretched along a track, the read head having a magnetically sensitive sensor for determining the position via a code in the tape.

[0008] One problem with known devices and systems is maintaining a defined arrangement of the tape in the elevator shaft while maintaining reliable position detection, particularly in newly constructed buildings that only become stable after a period of time. This means that due to material loading, changes in building construction, etc., the tape is subject to compressive strains, which can lead in particular to arching and / or bending and, in the worst case, damage to the tape. This can be solved by manual readjustment or by additional tensioning and / or storage devices for the tape in the elevator shaft. However, storage devices entail significant additional costs and are more susceptible to malfunctions of the device and / or system. Summary of the Invention

[0009] The object of the present invention is to provide an improved measuring sensor, in particular a measuring tape, and an associated measuring system that overcome or at least significantly reduce the aforementioned disadvantages of the prior art. In addition to reliably detecting the position of the elevator car in the elevator shaft, the sensor also allows for easy and inexpensive production and preferably simplified installation in the elevator shaft. This object is achieved by the subject matter of the independent claims. The dependent claims describe advantageous embodiments of the invention. Furthermore, the invention solves the other problems explained in the following description.

[0010] In a first aspect, the invention relates to a measuring tape for determining the position of an elevator car in an elevator shaft, the measuring tape being displaceable vertically in the elevator shaft and preferably being displaceable so as to extend across at least two building floors, the measuring tape having a tape-shaped base body and a position coding which can be read out by a magnetic field sensor and is made of a ferromagnetic material, the tape-shaped base body being made of a textile material, and the position coding being arranged to be inserted into the base body or applied to its surface.

[0011] Compared to the known prior art, the measuring tape itself is not made of a ferromagnetic tape such as iron, but rather consists of a textile matrix into which the position code is inserted or applied. This results in a lighter overall tape weight and allows for extended use. In particular, the measuring tape can be used even in harsh environmental conditions, such as those under the influence of salt water, for example for position determination on ships, wind turbines, shipyards, and the like. Furthermore, compared to known steel measuring tapes, the textile matrix offers greater tape elongation and flexibility, simplifying installation and positioning in elevator shafts. Furthermore, the measuring tape according to the present invention can be manufactured more easily and quickly. In particular, the complex bonding of the steel tape and rubber compound and subsequent magnetization, as is the case with the prior art, is no longer necessary.

[0012] In a preferred embodiment, the position encoding is implemented in such a way that it generates a temporary magnetic field that can be read out by a magnetic field sensor when excited externally by one or more permanent magnets. In this case, the ferromagnetic material is preferably not magnetized, meaning no permanent magnets or magnetic poles are inserted or implemented in the position encoding. Compared to the prior art permanently magnetized measuring tapes, this has the following advantages: the measuring tape does not adhere to magnetically conductive objects in the elevator shaft and is also insensitive to possible demagnetization by other strong permanent magnets, particularly floor magnets installed in the elevator shaft. This also expands the layout options in the elevator shaft.

[0013] Alternatively, the position coding can also include magnetized poles embedded in a ferromagnetic material. This allows for position coding with permanent magnetization along the measuring tape. This can be achieved, for example, by weaving magnetized threads or filaments into the textile material at the corresponding locations.

[0014] The position code can be made of any ferromagnetic material. Preferably, the ferromagnetic material consists of steel or iron, in particular in the form of a corresponding wire or thread, such as a steel wire. The diameter of the steel wire is preferably 0.5 to 2 mm, more preferably 0.7 to 1 mm.

[0015] The strip-shaped matrix is ​​preferably made of textile material, in particular textile fibers, woven or knitted. Alternatively, the matrix also can be spun or embroidered.

[0016] In a preferred embodiment, the strip-like substrate preferably has a uniform width perpendicular to the longitudinal dimension of 8 to 20 mm, more preferably 8 to 14 mm. The length of the strip-like substrate is adapted to the respective elevator shaft in which it will be installed. For example, for a five-story building, its length is approximately 15 meters.

[0017] The base body is preferably implemented as a continuous body. This means that the base body is particularly free of cutouts, holes, oblong holes, or other gaps. In other words, the base body is preferably implemented as a substantially uniform strip-shaped body. In this case, the textile design of the base body is preferably uniform throughout the entire longitudinal direction. For example, in a woven base body, the elongated warp threads preferably extend across the entire length of the measuring tape. This results in uniform material properties over the entire length of the measuring tape, and in particular, improved uniform strength of the measuring tape, particularly compared to steel tapes known in the prior art that have punched holes, perforated gaps, and / or oblong holes.

[0018] In a preferred embodiment, the position-encoding ferromagnetic material is inserted into the base body, in particular woven into the base body. In this case, the ferromagnetic material preferably has a plurality of warp threads extending longitudinally to the direction of extension of the base body and / or weft threads extending transversely to the direction of extension of the base body, the warp threads and weft threads preferably being made of steel wire.

[0019] In an alternative embodiment, the position-coded ferromagnetic material is applied to, in particular embossed on, the surface of the substrate. In this case, the ferromagnetic material preferably comprises ferrite powder, which is embossed on the surface of the textile substrate.

[0020] The position code preferably has a plurality of regions that are arranged one after another in the longitudinal direction of the base body and can be magnetically distinguished by a magnetic sensor. The magnetically distinguishable regions are preferably implemented so as to interact with permanent magnets, each of which has different polarity and is preferably arranged laterally to the measuring tape. The magnetically distinguishable regions preferably include at least one first region and at least one second region, the first region being capable of interacting with a first permanent magnet assigned to the measuring tape (e.g., a north pole) to generate a first magnetic field, and the second region being capable of interacting with a second permanent magnet assigned to the measuring tape (e.g., a south pole) and having a different magnetic polarity to generate a second magnetic field that is distinguishable from the first magnetic field. Alternatively, the magnetically distinguishable regions can also be implemented by permanent magnetization of a ferromagnetic material, in particular, permanent magnetization to a south pole or a north pole.

[0021] The magnetically distinguishable areas can be arranged in an alternating manner in the longitudinal dimension of the measuring tape. This allows, in particular, incremental position coding to be provided. The magnetically distinguishable areas can also be arranged sequentially or in an absolute manner in the longitudinal dimension. In this case, the corresponding areas can be arranged in a predetermined arrangement or order in the longitudinal dimension. In this case, in particular, the length of the corresponding dimensions in the longitudinal direction and / or the corresponding type of areas (i.e., areas suitable for generating the first or second magnetic field) can vary or be irregularly arranged in the longitudinal direction of the measuring tape.

[0022] The magnetically distinguishable regions are preferably each realized by a preferably uniform meandering design or arrangement of ferromagnetic material. In particular, the magnetically distinguishable regions can be made of steel wires that have a substantially uniform diameter and are inserted, preferably woven or knitted into the textile material.

[0023] Each magnetically distinguishable area preferably has uniform dimensions in the longitudinal dimension of the measuring tape. The corresponding dimensions in the longitudinal dimension are preferably between 5 and 15 mm, more preferably between 7 and 12 mm.

[0024] The respective magnetically distinguishable regions are preferably assigned to respective longitudinal sides of the measuring tape for interaction with the permanent magnets, which can be positioned laterally on the measuring tape. This means that the respective regions do not extend across the entire width of the measuring tape, but rather each region is closer to one of the two longitudinal sides of the measuring tape. Therefore, in a top view of the measuring tape, the respective distinct regions are preferably arranged one behind the other and laterally offset relative to one another in the longitudinal direction of the measuring tape.

[0025] In a preferred embodiment, the measuring tape has insulating means made of a non-magnetic material, in particular a plastic material, and extending transversely to the direction of extension or longitudinal dimension of the measuring tape and arranged between the individual magnetic regions and / or extending parallel to the lateral edges of the measuring tape. Due to these insulating means, the corresponding magnetic field can be temporarily generated in an optimized manner during the interaction between the corresponding region and the corresponding permanent magnet provided for interaction with the region.

[0026] The insulating means can be made, for example, of plastic threads that are incorporated into the textile material, in particular woven or knitted into the textile material. Alternatively, the insulating means can be glued to the surface of the substrate. The diameter of the insulating means is preferably 0.5 to 2 mm, more preferably 0.8 to 1.5 mm.

[0027] The measuring tape can have functional and / or signal lines that are incorporated into the base body in the longitudinal direction, in particular woven or knitted into the base body, and are preferably implemented in a non-force-absorbing manner. The functional and / or signal lines can be used to transmit signals along the measuring tape and can be contacted by external components at provided contact points for signal transmission.

[0028] The measuring tape can have a covering layer which is applied to the base body and covers the position coding. The covering layer is made in particular of a woven or knitted textile material. Alternatively, the covering layer can be made of another material, such as plastic.

[0029] The measuring tape can have a reflector which is inserted into the textile material of the substrate, in particular woven or knitted into the textile material of the substrate. For example, due to a suitable arrangement, the reflector can provide information which can be read out, for example, by an optical sensor.

[0030] In another aspect, the present invention relates to a measuring system comprising a measuring tape as described above and a sensor arrangement having at least one magnetic field sensor for reading out the position coding of the measuring tape. In a particularly preferred embodiment, the sensor arrangement of the system comprises at least one permanent magnet for temporarily magnetizing the ferromagnetic material of the position coding of the measuring tape, wherein the at least one magnetic field sensor is designed to read out the temporary magnetic field generated in this process.

[0031] In this case, the sensor arrangement is provided at the elevator car of the elevator system for a fixed position arrangement. In this case, the elevator car, on which the sensor arrangement is fixed, travels along a measuring tape in the elevator shaft, and the interaction of the measuring tape and the associated sensor arrangement enables the position of the elevator car in the elevator shaft to be determined.

[0032] The sensor arrangement is preferably configured to transmit the assigned position, velocity, and / or acceleration of the elevator car to a higher-level control system by reading out a measuring tape. This is preferably achieved by reading out and / or scanning the permanent or temporarily generated magnetic field of the measuring tape and / or the field transitions that occur between the corresponding magnetic fields as the sensor arrangement moves along the measuring tape. To this end, the sensor arrangement and / or the control system may have a correspondingly configured microcontroller.

[0033] In a preferred embodiment, the measuring system has at least one guide rail, which is assigned to the measuring tape and has permanent magnets of different polarity arranged laterally to the measuring tape. The guide rail can have a preferably groove-shaped cavity for receiving and guiding the measuring tape and for guiding cheeks extending laterally therefrom, in which the permanent magnets are preferably arranged. The guide rail is preferably arranged such that the magnets of different polarity extend along opposite sides in the longitudinal direction of the measuring tape. The permanent magnets preferably have a longitudinal dimension of 30 to 600 mm, more preferably 40 to 550 mm.

[0034] The magnetic field sensor of the measuring system comprises at least one Hall sensor, preferably a plurality of Hall sensors, which are arranged in a row and parallel to the running direction of the measuring tape. The magnetic field sensor is preferably arranged parallel to the surface of the measuring tape. The magnetic field sensor is preferably arranged opposite the base of the groove of the guide rail cavity, such that the measuring tape is arranged or runs between the guide rail and the magnetic field sensor, in particular in a sandwich-like manner.

[0035] In a preferred embodiment, the sensor arrangement includes a flux amplifier designed to concentrate the magnetic field delivered by the measuring tape. The flux amplifier preferably comprises a metal element, such as a steel plate, which is arranged parallel to the direction of extension of the measuring tape and preferably has a uniform cross-section. The flux amplifier is preferably arranged on the side of the magnetic field sensor of the sensor arrangement facing away from the measuring tape. Thus, the magnetic field sensor can be arranged in a sandwich-like manner between the magnetic tape and the flux amplifier.

[0036] In a further aspect, the invention relates to an elevator system having an elevator shaft and an elevator car movably arranged in the elevator shaft, the elevator system having a measuring system for determining the position of the elevator car in the elevator shaft as described above.

[0037] Further advantageous details of the invention are apparent from the subsequent description of preferred exemplary embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 shows a schematic side view of a preferred exemplary embodiment of an elevator system according to the present invention;

[0039] Figure 2 shows a top view of a preferred embodiment of a measuring tape according to the invention having an assigned guide rail with a permanent magnet;

[0040] Figure 3a shows a perspective side view of a measuring tape in a dispensing rail;

[0041] Figure 3b shows a perspective side view of a yoke element that can be mounted on a guide rail;

[0042] Figure 4a shows a perspective side view of a sensor arrangement of a measuring system according to the invention;

[0043] Figure 4b Shown according to Figure 4a A perspective bottom view of the sensor arrangement;

[0044] Figure 4c shows a sectional view of a preferred embodiment of a measuring system according to the invention, comprising a measuring tape and an assigned sensor arrangement for reading out a position coding; and

[0045] Figure 5a 、 Figure 5b A side view showing the magnetic field lines of a position code of a measuring tape when scanned by a sensor arrangement.

[0046] In the figures, identical elements and elements having the same function are marked with the same reference numerals. DETAILED DESCRIPTION

[0047] Figure 1 An elevator system 40 is shown having an elevator shaft 41 extending across several floors 43a-d of, for example, a building, a ship, a crane boom, or a high-bay warehouse, and an elevator car 42 movably arranged in the elevator shaft. Furthermore, the system has a drive device (not shown), which is generally known and enables the elevator car 42 to be selectively moved in the elevator shaft 41. To detect the position of the elevator car in the elevator shaft 41, the elevator system 40 has a measuring system 30 according to the present invention, which will be described in more detail below and comprises a measuring tape 10 arranged in the elevator shaft 41 and a sensor arrangement 20 interacting with the measuring tape 10 and arranged at the elevator car 42. The measuring tape 10 extends vertically through the entire elevator shaft 41 and is securely held in place in the elevator shaft by provided fixing devices 44a and 44b.

[0048] Figure 2 A schematic top view of a preferred embodiment of a measuring tape 10 according to the present invention is shown. The measuring tape 10 comprises a tape-shaped base 11 made of a textile material. Base 11 is formed into a longitudinally extending tape from a suitable textile yarn composed of one or more textile fibers, preferably woven or knitted. In the illustrated embodiment, the textile tape is a fabric made of a plurality of weft and warp threads. In this case, the warp threads, which extend in the longitudinal direction, absorb tension in the tape.

[0049] The measuring tape 10 preferably has a uniform width b of 8 to 20 mm, more preferably 8 to 14 mm, perpendicular to the longitudinal dimension L of the measuring tape 10 . The length L of the measuring tape 10 is adapted to the corresponding length of the elevator shaft 41 .

[0050] The measuring tape 10 has a position code made of a ferromagnetic material that can be read out by a magnetic field sensor 21 of a sensor arrangement 20 that can be assigned to the measuring tape 10. The position code is preferably embedded in the textile substrate 11 of the measuring tape, in particular woven or knitted therewith. In this case, the ferromagnetic material is preferably a metal wire, in particular a steel wire, which is incorporated into the substrate 11. In this case, the position code has a plurality of warp threads 13b extending longitudinally to the direction of extension of the substrate and weft threads 13a extending transversely to the direction of extension of the substrate. These threads form a predetermined pattern in the substrate 11, which forms a first magnetically distinguishable area 14a and a second magnetically distinguishable area 14b. In this context, "magnetically distinguishable" is understood to mean that the areas can be magnetically distinguished by an assignable magnetic field sensor.

[0051] As shown, magnetically distinguishable regions 14a and 14b are achieved, in particular, by a corresponding meandering design or arrangement of the ferromagnetic material in base body 11. In this case, magnetically distinguishable regions 14a and 14b are arranged one behind the other in a predetermined arrangement in the longitudinal direction L of base body 11, each region having a dimension L1 that is preferably uniform in the longitudinal direction. Furthermore, respective regions 14a and 14b have a preferably uniform width b1 perpendicular to the longitudinal direction of base body 11. This results in a preferably square or rectangular shape for respective regions 14a and 14b in a top view of measuring tape 10.

[0052] The magnetically distinguishable regions 14a and 14b are preferably implemented to interact with permanent magnets 22a and 22b, respectively, which have different polarities and are arranged laterally on the measuring tape 10. In this case, the permanent magnets 22a and 22b extend over a predetermined length along the respective side edges S1 and S2 of the measuring tape 10 in the longitudinal direction L. The first region 14a is arranged closer to the side edge S1 of the measuring tape assigned to the permanent magnet 22a or extending adjacent thereto. The second region 14b is arranged closer to the side edge S2 of the measuring tape assigned to the permanent magnet 22b or extending adjacent thereto. When the measuring tape 10 passes through the two stationary permanent magnets 22a and 22b, the first region 14a is therefore temporarily magnetized, in particular, by the first permanent magnet 22a, and the second region 14b is temporarily magnetized, in particular, by the second permanent magnet 22b. In this case, the magnetic fields 24a, 24b and 24c (see Figure 5a and Figure 5b ) are respectively generated in the third dimension, ie in the direction perpendicular to the surface 10a of the measuring tape 10, which magnetic field can be read by the assigned magnetic field sensor 21 (see Figure 5a and Figure 5b ).

[0053] Furthermore, the measuring tape 10 may include insulating devices 15a and 15b, which are made of a non-magnetic material, in particular a plastic material, and extend transversely to the extension direction L of the measuring tape 10 and are arranged between the individual magnetic regions 14a and 14b and / or extend parallel to the side edges S1 and S2 of the measuring tape. The non-magnetic material may be inserted into the textile material of the base body 11, preferably by means of plastic threads, for example, by being woven or knitted into the textile material of the base body.

[0054] The insulating devices 15a and 15b optimize the interaction of the first and second regions 14a and 14b with their assigned permanent magnets 22a and 22b, respectively. In particular, the respective regions 14a and 14b can be shielded from unassigned permanent magnets 22a and 22b, respectively (i.e., permanent magnets with which these regions do not interact), particularly by the insulating devices 15b extending in the longitudinal direction. The arrangement of the insulating devices 15a, which are each disposed between adjacent regions 14a and 14b and preferably extend transversely to the longitudinal direction, achieves optimized magnetic delimitation of the respective adjacent regions.

[0055] As an alternative to the above-described embodiment, the magnetically distinguishable regions 14a and 14b can be permanently magnetized, for example by inserting a magnetized ferromagnetic material, such as a magnetized steel wire, during the production of the measuring tape 10. In this case, the corresponding regions 14a and 14b have different polarities. Alternatively, the corresponding regions 14a and 14b can be magnetized accordingly after the production of the measuring tape.

[0056] Furthermore, as an alternative to the aforementioned embodiment, the ferromagnetic material may be embossed onto the surface 10a of the measuring tape 10 or applied thereto in a different manner. For example, the ferromagnetic material may be embossed as ferrite powder to form the corresponding first and second regions 14a, 14b. Similarly, the insulating means 15a and 15b may be embossed or glued onto the surface 10a.

[0057] Furthermore, the measuring tape 10 can have a layer (not shown) which covers the position coding and is preferably made of a textile material.

[0058] Figure 3a An individual illustration of the guide rail 25 of the measuring system 30 is shown (see Figure 4c ), the guide rail 25 is assigned to the measuring tape 10. The guide rail 25 has elongated gaps along its long sides, on the right and left sides, of the guide groove 25a. Bar magnets 22a and 22b of different polarity are placed in each elongated gap, with one side of the guide rail being a north pole and the other a south pole. This allows the corresponding measuring tape segments within the guide rail 25 to be magnetized as described above. A flux amplification device (not shown) may be additionally provided between the corresponding magnets 22a and 22b and the guide groove 25a. The flux amplification device may, for example, comprise an elongated steel element extending parallel to the corresponding magnets 22a and 22b and the guide groove 25a, and having a substantially triangular cross-section. Consequently, magnetic flux can be concentrated from the corresponding magnets toward the guide groove 25a.

[0059] Figure 3bA yoke element 26 is shown for receiving the guide rail 25. The yoke element has an elongated recess 26a adapted to the outer dimensions of the guide rail 25. The yoke element 26 is preferably made of metal and serves to short-circuit the two permanent magnets 22a and 22b of the guide rail 25. This results in a concentration of magnetic flux, which optimizes the generation of a temporary magnetic field when the magnetic tape 10 passes through the guide rail 25.

[0060] Figure 4a and Figure 4b A sensor arrangement 20 is shown for interacting with the measuring tape 10. The sensor arrangement 20 is designed to be arranged on an elevator car 42 of an elevator system 40 for secure positioning and, for this purpose, has corresponding positioning means 20a, such as a generally known mounting device with an integrated adjustment mechanism. To integrate the sensor arrangement 20 into an elevator control, it has connection options 27a and 27b.

[0061] Furthermore, the sensor arrangement 20 includes an elongated recess 28, preferably located at the bottom of the sensor arrangement, into which the aforementioned guide rail 25 can be received or inserted. The measuring tape 10, which extends in the guide groove 25a of the guide rail, extends between a downwardly facing surface 28a of the recess 28 and the guide groove 25a of the guide rail 25 and is thus sandwiched between the aforementioned components. The respective distances between the surface 28a and the guide groove 25a are selected such that the measuring tape 10 can slide substantially without resistance in the opening thus created.

[0062] The sensor arrangement 20 has at least one magnetic field sensor 21 on a surface 28a facing the measuring tape 20. The magnetic field sensor 21 preferably has a plurality of Hall sensors 21a, 21b, and 21c, which are arranged in a row and designed to read the measuring tape 10 and are arranged parallel to the direction of extension of the measuring tape.

[0063] Figure 4c A cross-sectional view of a measuring system 30 according to the present invention is shown, comprising a sensor arrangement 20 and a measuring tape 10 positioned therein. As shown, a yoke element 26 surrounding the guide rail 25 can be provided, as described above, to optimize the magnetic flux. Alternatively or additionally, the sensor arrangement 20 can include a flux amplifier 23 designed or configured to concentrate the magnetic field delivered by the measuring tape 10. Preferably, the flux amplifier 23 comprises a metal element with a uniform cross-section, extending parallel to the direction of extension L of the measuring tape 10 and disposed on the side of the magnetic field sensor 21 facing away from the measuring tape 21.

[0064] Since the flux amplifier 23 is arranged above and / or behind the magnetic field sensor 21, compared with an arrangement without a flux amplifier (see Figure 5a ), the optimized orientation and / or concentration of the magnetic fields 24a', 24b' and 24c', in each case resulting from the different regions 14a and 14b of the measuring scale strip 10, is achieved in such a way that the flux flows substantially orthogonally through the magnetic field sensors 21 and / or the respective Hall elements 21a, 21b and 21c and thus produces a stronger magnetic flux with less scattering (see Figure 5b ).

[0065] The readout of the position encoding is thus optimized. Furthermore, the distance between the measuring scale strip 10 and the magnetic field sensors 21 can thus be increased, which simplifies the configuration of the system, in particular with regard to the necessary tolerances.

[0066] The above-described embodiments are merely examples, to which the application is by no means limited.

Claims

1. A measuring tape for determining the position of an elevator car (42) in an elevator shaft (41), the measuring tape being capable of being arranged vertically in the elevator shaft and being capable of being arranged so as to extend across at least two building floors (43a, 43b, 43c, 43d), the measuring tape having a tape-shaped base body (11) and a position code which can be read out by a magnetic field sensor and is made of a ferromagnetic material, characterized in that The strip-shaped base (11) is made of a textile material and the position code is arranged to be inserted into the strip-shaped base or applied to a surface (11a) of the strip-shaped base.

2. The measuring tape according to claim 1, wherein: The position encoding is realized in such a way that, when excited from the outside by one or more permanent magnets, it generates a temporary magnetic field which can be read out by the magnetic field sensor.

3. The measuring tape according to claim 1, wherein: The strip-shaped base (11) is woven or knitted from textile materials.

4. The measuring tape according to claim 1, wherein: The position-encoded ferromagnetic material is inserted into the strip-shaped matrix (11), and the ferromagnetic material has a plurality of warps (13b) extending longitudinally to the extending direction of the strip-shaped matrix and / or wefts (13a) extending transversely to the extending direction of the strip-shaped matrix, and the warps (13b) and wefts (13a) are made of steel wires.

5. The measuring tape according to claim 1, wherein: The ferromagnetic material of the position code is imprinted on a surface (11a) of a strip-shaped substrate (11).

6. The measuring tape according to claim 5, characterized in that The position code has a plurality of regions arranged one after another in the longitudinal direction (L) of the strip-shaped substrate (11), the plurality of regions being magnetically distinguishable by a magnetic sensor, and each region having a uniform size (L1) in the longitudinal direction (L).

7. The measuring tape according to claim 6, wherein: The magnetically distinguishable regions are realized so as to interact respectively with permanent magnets which have different polarities and are arranged laterally of the measuring tape (10).

8. The measuring tape according to claim 7, wherein: The measuring tape (10) has insulating means (15a, 15b) which are made of a non-magnetic material and extend transversely to the longitudinal direction (L) of the measuring tape and are arranged between the individual magnetically distinguishable areas and / or extend parallel to the lateral edges of the measuring tape.

9. The measuring tape according to claim 7, wherein: The magnetically distinguishable regions are each realized by a uniform meandering design or arrangement of the ferromagnetic material.

10. The measuring tape according to claim 7, wherein: The magnetically distinguishable areas are arranged in the longitudinal direction (L) of the strip-shaped substrate (11) in an alternating manner, a sequential manner or an absolutely coded manner.

11. The measuring tape according to claim 6, wherein: The strip-shaped base body (11) has functional and / or signal lines which are incorporated in the longitudinal direction (L) and are implemented in a non-force-absorbing manner.

12. The measuring tape according to claim 5, wherein: The measuring tape (10) has a covering layer which is applied to the tape-shaped base body (11) and covers the position code, and the covering layer is made of a woven or knitted textile material.

13. A measuring system comprising a measuring tape (10) according to any one of the preceding claims and a sensor arrangement (20), the sensor arrangement (20) having at least one magnetic field sensor (21) for reading out the position coding of the measuring tape (10).

14. The measurement system according to claim 13, wherein: The sensor arrangement (20) has at least one permanent magnet for temporarily magnetizing the ferromagnetic material of the position code of the measuring tape (10), and the magnetic field sensor (21) is implemented for reading out the temporary magnetic field generated in this process.

15. The measurement system according to claim 13, characterized in that The measuring system has at least one guide rail (25) which is assigned to the measuring tape and has permanent magnets of different polarity which are arranged laterally to the measuring tape.

16. The measurement system according to claim 13, wherein: The magnetic field sensor (21) has a plurality of Hall sensors which are arranged in a row and parallel to the longitudinal direction (L) of the measuring tape (10).

17. The measurement system according to claim 13, wherein: The sensor arrangement (20) has a flux amplifier (23) for concentrating the magnetic field delivered by the measuring tape (10).

18. The measurement system according to claim 17, characterized in that The flux amplifier (23) has a metal element which is arranged parallel to the longitudinal direction (L) of the measuring tape (10) and has a uniform cross section.

19. The measurement system according to claim 17, wherein: The flux amplifier (23) is arranged on a side of the magnetic field sensor (21) of the sensor arrangement (20) facing away from the measuring tape (10).

20. An elevator system having an elevator shaft (41) and an elevator car (42) arranged movably in the elevator shaft, the elevator system having a measuring system (30) according to any one of claims 13 to 19, the measuring system (30) being used to determine the position of the elevator car (42) in the elevator shaft (41).

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