WO1996007871A1 - Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object - Google Patents

Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object Download PDF

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Publication number
WO1996007871A1
WO1996007871A1 PCT/SE1995/001010 SE9501010W WO9607871A1 WO 1996007871 A1 WO1996007871 A1 WO 1996007871A1 SE 9501010 W SE9501010 W SE 9501010W WO 9607871 A1 WO9607871 A1 WO 9607871A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
thin object
measuring device
thickness
fabric
Prior art date
Application number
PCT/SE1995/001010
Other languages
French (fr)
Inventor
Christer BERGÉRUS
Original Assignee
Novatech Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novatech Gmbh filed Critical Novatech Gmbh
Priority to DE69519720A priority Critical patent/DE69519720D1/en
Priority to EP95931497A priority patent/EP0728296B1/en
Priority to AU34891/95A priority patent/AU3489195A/en
Priority to AT95931497T priority patent/ATE198373T1/en
Priority to US08/637,686 priority patent/US5817947A/en
Priority to DE69519720T priority patent/DE69519720T4/en
Publication of WO1996007871A1 publication Critical patent/WO1996007871A1/en
Priority to FI961745A priority patent/FI110341B/en
Priority to NO961867A priority patent/NO961867L/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
    • G01B7/107—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring objects while moving

Definitions

  • Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object.
  • the present invention relates to a measuring device for measuring the properties of a thin object, especially a fabric, said prop ⁇ erties being such as thickness and tension profile across the entire width of the object.
  • the thin object could except a fabric also be for example a felt or a cloth.
  • a thin object is an object having a thickness of up to 20 mm, and especially up to 10 mm.
  • the thickness of the fabric is measured with a dial indicator.
  • the problem with this method is that only a few individual points across the edges of the fabric are reachable. Thus, it is difficult to get a picture about the entire thickness profile of the fabric.
  • the main problem is that it is difficult to obtain an accurate indication of the position across the width of the fabric for the point being measured for this manual measurement of thickness using the dial indicator. Thereby also the problem to make new comparative measurements at a later point of time arises.
  • EP-0279 173 discloses a device for measuring changes in the surface profile of stripe shaped materials, in an unrolled position, especially photographic base paper.
  • the measuring device is provided inside a carriage like, wheel equipped stand.
  • the transducer of the measuring device is resilient provided at the bottom of the carriage-like stand to measure changes in the surface profile of the photographic base paper.
  • the carriage-like stand is rolled over the photographic base paper during the measuring process.
  • the device according to EP-0279 173 measures the object to be measured from only one side, i.e. only the surface profile and not the thickness profile.
  • this device is designed for single measurements, i.e. the purpose is to approve or disapprove the quality of the object being measured and thus the position of the measuring point is not established.
  • DE-3 507 651 discloses a measuring device for measuring the thickness of extended, extruded plastic objects.
  • the illustrated device measures the thickness of a foil.
  • the thickness of the foil is measured by a measuring head which slides over the foil detecting changes in the magnetic field. The measuring head is brought over the measured object across a rail, if this is done manually or automatically cannot be concluded from the description.
  • This device measures the thickness of the object to be measured, since the measuring device is provided on both sides of the object, but measuring with this device is very time consuming, since permanent magnets first must be arranged on one side of the object to be measured.
  • this device does not have any means to register at which position the measurement is carried out. Therefore this device is not suitable for repeatable, comparative measurements.
  • the object of the present invention is to provide a measuring device which is capable of measuring the properties of a thin object, especially a fabric, said properties being, for example the thickness profile and the tension profile across the entire width of the object.
  • a measuring device comprising position determining means to repeatedly be able to carry out measurements on the thin object.
  • FIG. 1 is a schematic view showing a first embodiment of the upper carriage of the measuring device according to the present invention
  • FIG. 2 is a schematic view showing a first embodiment of the lower carriage of the measuring device according to the present invention
  • FIG. 3 is a side view showing the two carriages in figure 1 and figure 2
  • FIG. 4 is a view showing the driving means of the measuring device.
  • FIGs 1 to 3 show a first embodiment of the present invention.
  • the measuring device comprises two carriages, of which the upper carriage is shown in figure 1 and the lower carriage is shown in figure 2.
  • Figure 3 shows the two carriages together in a side view.
  • the two carriages are separated from each other by a thin object 2, on which the measurement is to be carried out and which throughout the description will be referred to as the object to be measured.
  • the two carriages, in figures 1 to 3 comprise, two frames 4 and 6, two mounting plates 8 and 10, eighteen support wheels 12-20, two driving wheels 22, a controller 24, memory means 26, measuring means comprising a load cell 33 and two inductive transducers 35, driving means 31 and ten permanent magnets 32a-32f.
  • the measuring device thus comprises two carriages of which the upper carriage shown in figure 1 will be described first.
  • the body of the upper carriage is made up of a rectangular frame 4.
  • the frame 4 is preferably made of a light material, such as a rectangular section of aluminium, in order to keep down the weight of the measuring device and thereby the driving power required.
  • the controller 24 and the memory means 26 are provided on the frame 4 .
  • the mounting plate 8 is provided between both the long sides 4a and 4b of the frame 4.
  • On the mounting plate 8 there is in turn provided a part of the measuring means, which will be described in more detail below.
  • the driving means 31 will be described in more detail in conjunction with figure 4.
  • the support wheels 12-15 are provided on both the long sides 4a and 4b.
  • the magnet 32a is provided between the two pairs of front wheels 12 and 13 on the long sides 4a and 4b respectively.
  • the magnet 32b is provided between the two pairs of rear wheels 14 and 15.
  • the magnet 32c which is shown in figure 4, is provided between the driving wheels 22.
  • the lower carriage of the measuring device which is shown in figure 2, also comprises a rectangular frame 6, which is made of a light material.
  • a mounting plate 10 is provided between the two long sides 6a and 6b of the frame 6.
  • This mounting plate 10 is used among other things, by means of a fixture, to mount a part of the measuring means, when the measuring means consists of two parts, which have to be mounted on both sides of the object to be measured, for example if the measuring means is an inductive transducer 35.
  • Two support wheels 20 are provided adjacent to the mounting plate 10. These support wheels 20 are provided correspondingly to the two driving wheels 22 of the upper carriage.
  • the support wheels 16-19 are provided on the long sides 6a and 6b of the frame 6 correspondingly to the position of the support wheels 12- 15 of the upper carriage in figure 1, and the only thing preventing the support wheels 12-15 from making contact with the support wheels 16-19 is the object to be measured 2.
  • the magnet 32d is provided between the two pairs of front wheels 16 and
  • the magnets 32a-32f are provided in pairs with the first magnet 32a- 32c in each pair secured on the upper carriage and the second magnet 32d-32f in each pair secured on the lower carriage.
  • the first magnet 32a-32c in each pair attracts the second magnet 32d-32f in each pair, said magnets in each pair are located in corresponding locations on each side of the object to be measured 2.
  • the power of the magnets 32a-32f are adapted in such a manner that they secure the two carriages of the measuring device together when the driving means 31 drives them across the object being measured 2.
  • the magnets 32a-32f are preferably permanent magnets, but electromagnets or other means for holding the carriages together could also be used.
  • the measuring means comprises, a load cell 33 with a measuring head 34 and two inductive transducers 35.
  • the load cell 33 is secured on the mounting plate 8 in such a manner that the measuring head 34 makes contact with the object 2 to be measured in order to measure its tension.
  • the two inductive transducers 35 are provided at two of the corners of the upper frame 4 and the lower frame 4 respectively.
  • the inductive transducers are divided into two parts, one part constituting the transducer itself and the other part constituting the reference surface. The parts are placed at each side of the object 2 to be measured. This is necessary to be able to measure the thickness profile of the object 2.
  • the measuring means could comprise a permeability transducer, which only consists of one transducer part or the measuring means could comprise a combination of different transducers.
  • Such transducers could be optical transducers, different kinds of cameras to measure thickness, permeability, tension, topography etc.
  • FIG 4 shows an enlarged view of the driving means 31.
  • the driving means 31 comprises, as already mentioned, the DC motor 30 and the two driving wheels 22.
  • the DC motor 30 is coupled to the driving wheels 22 by means of a driving belt 36.
  • the driving wheels 22 make contact with object 2 to be measured, on which opposite side the support wheels 20 make contact, and drive the measuring device across the object 2 during the measuring process.
  • the driving wheels 22 are designed in such a manner that the friction between the object 2 to be measured and the driving wheels 22 is great enough to drive the measuring device forward.
  • the driving means could comprise some other suitable driving source.
  • means 38 for determining the position preferably a pulse transducer, adjacent to a driving shaft 40 of the DC motor 30.
  • the pulse transducer 38 counts marks on the driving shaft 40 and determines in said manner the position of the measuring device. In that way it is possible to link the measurement reading to a position on the object 2 being measured.
  • said pulse transducer 38 is secured adjacent to a special support wheel (not shown), to secure that the pulse transducer 38 gives a correct position at all times. This embodiment is especially suitable when there exists a risk that the driving wheels 22 spin, since the determination of the position in this case is independent of the driving shaft 40 of the DC motor 30.
  • the upper carriage of the measuring device is placed on top of the fabric.
  • the lower carriage is placed in a corresponding way under the fabric. Due to the magnets 32a-32f the lower carriage is safely kept in place. Since the support wheels 20 preferably are flexible mounted to the mounting plate 10 it could be necessary to manually bring the magnet 32f and the support wheels 20 towards the surface of the object being measured to ensure that the magnets 32 c and 32f make contact.
  • the measuring device is then lined up to be perpendicular to the edge of the fabric. When this is done the measuring device is ready to start measuring, for example the thickness across the entire width of the fabric.
  • the controller 24 When the measuring device thus is activated the controller 24 generates a signal that starts the DC motor 30. By means of the driving shaft 40 and the driving belt 36 the power of the DC motor 30 is then transmitted to the two driving wheels 22 and the measuring device starts moving forward across the width of the fabric.
  • the controller 24 then activates the measuring means to carry out for example a thickness measurement.
  • the time periods between the activated modes of the measuring means can be preset. In order to obtain a high level of measuring accuracy for example 2 values/mm could be collected.
  • the collected measuring values are then stored in the memory means 26. When the measurement is completed the values stored in the memory means 26 are transmitted to a personal computer for evaluation.
  • both the controller 24 and the memory means 26 are located outside the measuring device and implemented in a computer.
  • the invention is not limited to those embodi ⁇ ments, for example could one carriage be arranged on a beam on one side of the fabric.
  • the beam is provided across the fabric above or beneath the fabric with the beam ends fixedly supported on a both sides of the fabric.
  • the movements across the fabric by the carriage are then guided by the beam.
  • the driving means of the carriage could be the same as described above or be provided on the beam.
  • the carriage could also be pulled manually across the fabric.
  • two beams are arranged on each side of the object being measured and thus both carriages are guided by a beam.

Abstract

The invention relates to a measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object (2), especially a fabric. To measure those properties in a reliable way is very difficult today, since the width of fabric, up to 10 meters and greater, limits the access. Especially when the measurement has to be carried out on both sides of the fabric, for example in a thickness measurement, it is difficult to measure across the entire width of the fabric. The invention solves this problem with a measuring device comprising: a) upper mobile means adapted to be placed on the top side of the thin object (2); b) lower mobile means adapted to be placed on the bottom side of the thin object (2), directly below the upper mobile means; c) means (32a-32f) to hold together the upper and the lower mobile means with the thin object (2) there in between without damaging the thin object (2); d) measuring means (33, 35) provided on at least one of the mobile means for measuring the properties of the thin object (2); said mobile means being movable together or separately across the surface of the thin object (2).

Description

Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object.
Technical Field
The present invention relates to a measuring device for measuring the properties of a thin object, especially a fabric, said prop¬ erties being such as thickness and tension profile across the entire width of the object. The thin object could except a fabric also be for example a felt or a cloth. In the present invention it is intended that a thin object is an object having a thickness of up to 20 mm, and especially up to 10 mm.
Background Art
It is known that the quality of the finished paper product in paper manufacturing to a large extent is dependent upon the fabric. Therefore it is very important for the paper manufacturer to get knowledge about the fabrics prevailing condition and properties, such as thickness and tension profile, permeability etc. To measure those properties in a reliable way is very difficult today, since there is a lack of measuring apparatuses and methods being capable of mapping the properties across the entire width of the fabric. It is primarily the width of the fabric, up to 10 meters and greater, that makes it difficult to carry out these measurements.
Today the thickness of the fabric is measured with a dial indicator. The problem with this method is that only a few individual points across the edges of the fabric are reachable. Thus, it is difficult to get a picture about the entire thickness profile of the fabric. However, the main problem is that it is difficult to obtain an accurate indication of the position across the width of the fabric for the point being measured for this manual measurement of thickness using the dial indicator. Thereby also the problem to make new comparative measurements at a later point of time arises.
The problems described above in conjunction with the measurement of the thickness also apply to the measurement of the tension profile, permeability etc. of the fabric, even if it has been possible to measure those across the entire fabric. Thus, there is a need to being able to repeatedly carry out measurements across the entire width of the fabric in a simple and reliable way.
EP-0279 173 discloses a device for measuring changes in the surface profile of stripe shaped materials, in an unrolled position, especially photographic base paper. The measuring device is provided inside a carriage like, wheel equipped stand. The transducer of the measuring device is resilient provided at the bottom of the carriage-like stand to measure changes in the surface profile of the photographic base paper. The carriage-like stand is rolled over the photographic base paper during the measuring process. Thus, the device according to EP-0279 173 measures the object to be measured from only one side, i.e. only the surface profile and not the thickness profile. Furthermore this device is designed for single measurements, i.e. the purpose is to approve or disapprove the quality of the object being measured and thus the position of the measuring point is not established.
DE-3 507 651 discloses a measuring device for measuring the thickness of extended, extruded plastic objects. In one embodiment the illustrated device measures the thickness of a foil. By means of permanent magnets, that are provided on a support rail on which the foil rests, the thickness of the foil is measured by a measuring head which slides over the foil detecting changes in the magnetic field. The measuring head is brought over the measured object across a rail, if this is done manually or automatically cannot be concluded from the description. This device measures the thickness of the object to be measured, since the measuring device is provided on both sides of the object, but measuring with this device is very time consuming, since permanent magnets first must be arranged on one side of the object to be measured. Furthermore, this device does not have any means to register at which position the measurement is carried out. Therefore this device is not suitable for repeatable, comparative measurements.
Object nf the invention
The object of the present invention is to provide a measuring device which is capable of measuring the properties of a thin object, especially a fabric, said properties being, for example the thickness profile and the tension profile across the entire width of the object.
In a preferred embodiment of the invention there is further provided a measuring device comprising position determining means to repeatedly be able to carry out measurements on the thin object.
The object of the invention is solved by means of a measuring device according to claim 1. Other embodiments of the present invention are defined in the dependent claims 2 to 10.
Description of the drawings
Different embodiments of the invention will be described in more detail below in conjunction with the accompanying figures, in which
FIG. 1 is a schematic view showing a first embodiment of the upper carriage of the measuring device according to the present invention, FIG. 2 is a schematic view showing a first embodiment of the lower carriage of the measuring device according to the present invention, FIG. 3 is a side view showing the two carriages in figure 1 and figure 2, FIG. 4 is a view showing the driving means of the measuring device.
Description of preferred embodiments
Figures 1 to 3 show a first embodiment of the present invention. The measuring device comprises two carriages, of which the upper carriage is shown in figure 1 and the lower carriage is shown in figure 2. Figure 3 shows the two carriages together in a side view. The two carriages are separated from each other by a thin object 2, on which the measurement is to be carried out and which throughout the description will be referred to as the object to be measured. The two carriages, in figures 1 to 3 comprise, two frames 4 and 6, two mounting plates 8 and 10, eighteen support wheels 12-20, two driving wheels 22, a controller 24, memory means 26, measuring means comprising a load cell 33 and two inductive transducers 35, driving means 31 and ten permanent magnets 32a-32f.
The measuring device thus comprises two carriages of which the upper carriage shown in figure 1 will be described first. The body of the upper carriage is made up of a rectangular frame 4. The frame 4 is preferably made of a light material, such as a rectangular section of aluminium, in order to keep down the weight of the measuring device and thereby the driving power required. On the frame 4 the controller 24 and the memory means 26 are provided. The mounting plate 8 is provided between both the long sides 4a and 4b of the frame 4. On the mounting plate 8 there is in turn provided a part of the measuring means, which will be described in more detail below. Adjacent to the mounting plate 8 there is provided the driving means 31, which comprises a DC motor 30 and the two driving wheels 22. The driving means 31 will be described in more detail in conjunction with figure 4. The support wheels 12-15 are provided on both the long sides 4a and 4b. The magnet 32a is provided between the two pairs of front wheels 12 and 13 on the long sides 4a and 4b respectively. In a corresponding way the magnet 32b is provided between the two pairs of rear wheels 14 and 15. Furthermore the magnet 32c, which is shown in figure 4, is provided between the driving wheels 22.
The lower carriage of the measuring device, which is shown in figure 2, also comprises a rectangular frame 6, which is made of a light material. In a similar way as in the case with the upper carriage a mounting plate 10 is provided between the two long sides 6a and 6b of the frame 6. This mounting plate 10 is used among other things, by means of a fixture, to mount a part of the measuring means, when the measuring means consists of two parts, which have to be mounted on both sides of the object to be measured, for example if the measuring means is an inductive transducer 35. Two support wheels 20 are provided adjacent to the mounting plate 10. These support wheels 20 are provided correspondingly to the two driving wheels 22 of the upper carriage. The support wheels 16-19 are provided on the long sides 6a and 6b of the frame 6 correspondingly to the position of the support wheels 12- 15 of the upper carriage in figure 1, and the only thing preventing the support wheels 12-15 from making contact with the support wheels 16-19 is the object to be measured 2. The magnet 32d is provided between the two pairs of front wheels 16 and
17 on the long sides 6a and 6b respectively and in a corresponding way the magnet 32e is provided between the two pairs of rear wheels
18 and 19. Furthermore the magnet 32f is provided between the support wheels 20.
The magnets 32a-32f are provided in pairs with the first magnet 32a- 32c in each pair secured on the upper carriage and the second magnet 32d-32f in each pair secured on the lower carriage. The first magnet 32a-32c in each pair attracts the second magnet 32d-32f in each pair, said magnets in each pair are located in corresponding locations on each side of the object to be measured 2. The power of the magnets 32a-32f are adapted in such a manner that they secure the two carriages of the measuring device together when the driving means 31 drives them across the object being measured 2. The magnets 32a-32f are preferably permanent magnets, but electromagnets or other means for holding the carriages together could also be used.
In the first embodiment, which is shown in figures 1 to 3, the measuring means comprises, a load cell 33 with a measuring head 34 and two inductive transducers 35. The load cell 33 is secured on the mounting plate 8 in such a manner that the measuring head 34 makes contact with the object 2 to be measured in order to measure its tension. The two inductive transducers 35 are provided at two of the corners of the upper frame 4 and the lower frame 4 respectively. Thus, the inductive transducers are divided into two parts, one part constituting the transducer itself and the other part constituting the reference surface. The parts are placed at each side of the object 2 to be measured. This is necessary to be able to measure the thickness profile of the object 2. In a second embodiment (not shown) only one inductive transducer is provided, with the first part being secured on the mounting plate 8 and the second part on the mounting plate 10. In further embodiments the measuring means could comprise a permeability transducer, which only consists of one transducer part or the measuring means could comprise a combination of different transducers. Such transducers could be optical transducers, different kinds of cameras to measure thickness, permeability, tension, topography etc.
Figure 4 shows an enlarged view of the driving means 31. The driving means 31 comprises, as already mentioned, the DC motor 30 and the two driving wheels 22. The DC motor 30 is coupled to the driving wheels 22 by means of a driving belt 36. The driving wheels 22 make contact with object 2 to be measured, on which opposite side the support wheels 20 make contact, and drive the measuring device across the object 2 during the measuring process. Thus, the driving wheels 22 are designed in such a manner that the friction between the object 2 to be measured and the driving wheels 22 is great enough to drive the measuring device forward. Instead of a DC motor 30 the driving means could comprise some other suitable driving source.
In a preferred embodiment of the invention is provided means 38 for determining the position, preferably a pulse transducer, adjacent to a driving shaft 40 of the DC motor 30. The pulse transducer 38 counts marks on the driving shaft 40 and determines in said manner the position of the measuring device. In that way it is possible to link the measurement reading to a position on the object 2 being measured. In another embodiment said pulse transducer 38 is secured adjacent to a special support wheel (not shown), to secure that the pulse transducer 38 gives a correct position at all times. This embodiment is especially suitable when there exists a risk that the driving wheels 22 spin, since the determination of the position in this case is independent of the driving shaft 40 of the DC motor 30.
To better understand how the different means in the measuring device cooperate the description will now be directed towards a typical measuring process, which measures properties of a fabric.
At the start of the process the upper carriage of the measuring device is placed on top of the fabric. The lower carriage is placed in a corresponding way under the fabric. Due to the magnets 32a-32f the lower carriage is safely kept in place. Since the support wheels 20 preferably are flexible mounted to the mounting plate 10 it could be necessary to manually bring the magnet 32f and the support wheels 20 towards the surface of the object being measured to ensure that the magnets 32 c and 32f make contact. The measuring device is then lined up to be perpendicular to the edge of the fabric. When this is done the measuring device is ready to start measuring, for example the thickness across the entire width of the fabric.
When the measuring device thus is activated the controller 24 generates a signal that starts the DC motor 30. By means of the driving shaft 40 and the driving belt 36 the power of the DC motor 30 is then transmitted to the two driving wheels 22 and the measuring device starts moving forward across the width of the fabric. The controller 24 then activates the measuring means to carry out for example a thickness measurement. The time periods between the activated modes of the measuring means can be preset. In order to obtain a high level of measuring accuracy for example 2 values/mm could be collected. The collected measuring values are then stored in the memory means 26. When the measurement is completed the values stored in the memory means 26 are transmitted to a personal computer for evaluation.
In a further embodiment both the controller 24 and the memory means 26 are located outside the measuring device and implemented in a computer.
Above some different embodiments of the present invention have been described. However, the invention is not limited to those embodi¬ ments, for example could one carriage be arranged on a beam on one side of the fabric. In this case the beam is provided across the fabric above or beneath the fabric with the beam ends fixedly supported on a both sides of the fabric. The movements across the fabric by the carriage are then guided by the beam. The driving means of the carriage could be the same as described above or be provided on the beam. The carriage could also be pulled manually across the fabric. In a further embodiment two beams are arranged on each side of the object being measured and thus both carriages are guided by a beam.
Even though this invention has been described using two carriages, one on each side of the object being measured, it is obvious to those skilled in the art that for measurements that only require measuring from one side, such as tension profile and permeability measurements, the carriage not holding the measuring means could be deleted. But to carry out measurements, such as thickness profile measurements, two carriages are required. The carriages could also for example be replaced by sledges or by crawlers. Therefore it is intended that the present invention only is limited by the scope of the appended claims.

Claims

1. Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object (2) comprising a) upper mobile means adapted to be placed on the top side of the thin object (2) b) lower mobile means adapted to be placed on the bottom side of the thin object (2), directly below the upper mobile means, c) means (32a-32f) for holding the upper and the lower mobile means together, with the thin object (2) provided there between without damaging the thin object (2), d) measuring means (33, 35) provided on at least one of the mobile means for measuring the properties of the thin object (2), said mobile means being moveable together or separately across the surface of the thin object (2).
2. Measuring device according to claim 1, characterised in that the mobile means are carriages.
3. Measuring device according to claim 1 or 2, characterised in that the means for holding the carriages together are permanent magnets (32a-32f), electromagnets or the like provided on a frame (4, 6) of the upper and lower carriage respectively in pairs on both sides of the thin object (2).
4. Measuring device according to any of the preceding claims, characterised in that the measuring means comprises an inductive transducer (35) for measuring the thickness of the thin object (2), provided on both sides of the thin object (2) on a mounting plate (8, 10) of the upper and lower carriage respectively.
5. Measuring device according to any of the preceding claims, characterised in that the measuring means comprises a load cell (33), with a measuring head (34) for measuring the tension profile of the thin object (2), provided on one of the mounting plates (8, 10) of the upper and lower carriage respectively.
6. Measuring device according to any of the preceding claims, characterised in that the measuring means comprises a permeability transducer for measuring the permeability of the thin object (2), provided on one side of the thin object (2) on one of the mounting plates (8, 10) respectively.
7. Measuring device according to any of the preceding claims, characterised in that it further comprises driving means (31) for driving the measuring device across the thin object (2).
8. Measuring device according to claim 7, characterised in that there are position determining means (38) provided adjacent to a driving shaft (40) for determining the position of the measuring device.
9. Measuring device according to claim 7 or 8, characterised in that the driving means (31) comprises a DC motor (30) which by means of the driving shaft (40) and a driving belt (36) drives at least one driving wheel (22), which makes contact with the thin object (2) and drives the measuring device across the thin object (2).
10. Measuring device according to any of the preceding claims, characterised in that the measuring device is used for measuring the properties of a fabric or a felt, such as thickness and tension profile and permeability.
PCT/SE1995/001010 1994-09-09 1995-09-08 Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object WO1996007871A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
DE69519720A DE69519720D1 (en) 1994-09-09 1995-09-08 Measuring apparatus for measuring one or more properties such as the thickness and the tension profile of a woven or a band-shaped material.
EP95931497A EP0728296B1 (en) 1994-09-09 1995-09-08 Measuring device for measuring one or more properties, such as thickness and tension profile, of a web or band-shaped material.
AU34891/95A AU3489195A (en) 1994-09-09 1995-09-08 Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object
AT95931497T ATE198373T1 (en) 1994-09-09 1995-09-08 MEASURING APPARATUS FOR MEASURING ONE OR MORE PROPERTIES, SUCH AS THICKNESS AND TENSION PROFILE, OF A WOVEN OR TAPE MATERIAL.
US08/637,686 US5817947A (en) 1994-09-09 1995-09-08 Measuring device for measuring one or more properties, such as thickness and tension profile, of a thin object
DE69519720T DE69519720T4 (en) 1994-09-09 1995-09-08 Measuring apparatus for measuring one or more properties such as the thickness and the tension profile of a woven or a band-shaped material.
FI961745A FI110341B (en) 1994-09-09 1996-04-23 Measuring device for measuring a thin body
NO961867A NO961867L (en) 1994-09-09 1996-05-08 Measuring device for measuring the properties of a thin object

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9403018-6 1994-09-09
SE9403018A SE503348C2 (en) 1994-09-09 1994-09-09 Measuring device for measuring one or more properties, eg thickness and stress profile, of a thin object

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EP (1) EP0728296B1 (en)
AT (1) ATE198373T1 (en)
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DE (2) DE69519720T4 (en)
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DE202005017506U1 (en) * 2005-11-07 2007-03-22 Wangner Gmbh & Co. Kg Apparatus for inspecting a sheet, e.g. a paper machine clothing

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EP1500929A2 (en) * 2003-07-16 2005-01-26 The Boeing Company Method and apparatus for inspecting a structure utilizing magnetically attracted probes
EP1500929A3 (en) * 2003-07-16 2011-10-26 The Boeing Company Method and apparatus for inspecting a structure utilizing magnetically attracted probes
DE202005017506U1 (en) * 2005-11-07 2007-03-22 Wangner Gmbh & Co. Kg Apparatus for inspecting a sheet, e.g. a paper machine clothing
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Also Published As

Publication number Publication date
AU3489195A (en) 1996-03-27
SE9403018L (en) 1996-03-10
FI961745A0 (en) 1996-04-23
DE69519720T4 (en) 2009-07-09
SE503348C2 (en) 1996-05-28
US5817947A (en) 1998-10-06
EP0728296B1 (en) 2000-12-27
DE69519720T2 (en) 2001-08-02
NO961867D0 (en) 1996-05-08
EP0728296A1 (en) 1996-08-28
NO961867L (en) 1996-05-08
ATE198373T1 (en) 2001-01-15
SE9403018D0 (en) 1994-09-09
FI110341B (en) 2002-12-31
DE69519720D1 (en) 2001-02-01
FI961745A (en) 1996-04-23

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