EP2145162A1 - Balance - Google Patents

Balance

Info

Publication number
EP2145162A1
EP2145162A1 EP08733811A EP08733811A EP2145162A1 EP 2145162 A1 EP2145162 A1 EP 2145162A1 EP 08733811 A EP08733811 A EP 08733811A EP 08733811 A EP08733811 A EP 08733811A EP 2145162 A1 EP2145162 A1 EP 2145162A1
Authority
EP
European Patent Office
Prior art keywords
base plate
plate
support plate
balance
spacer elements
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP08733811A
Other languages
German (de)
English (en)
Inventor
Jevgenij Mannhart
Cyrill RÖTHLIN
Marc Robert
Jérôme BERNHARD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carag AG
Original Assignee
Carag AG
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 Carag AG filed Critical Carag AG
Publication of EP2145162A1 publication Critical patent/EP2145162A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G7/00—Weighing apparatus wherein the balancing is effected by magnetic, electromagnetic, or electrostatic action, or by means not provided for in the preceding groups
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
    • G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
    • G01G23/37—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting
    • G01G23/3728—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting with wireless means

Definitions

  • the invention relates to a balance according to the preamble of patent claim 1.
  • DE 38 119 42 A1 discloses an electronic balance with corner load sensors, which has a first measuring arrangement with a coil and a position sensor for measuring the weight and a second measuring arrangement with a further coil for measuring the deflection of the weighing pan.
  • the weight measurement is carried out by the detection of a compensation current, which is required to generate a compensation force to compensate for the weight of the sample.
  • the measurement of the deflection of the shell by the second coil is made to compensate for errors in weight measurement due to unequal loading of the scale.
  • the two measurements are independent of each other and are only connected by a signal processing system.
  • a balance with a bending beam and a Hall sensor is shown, which performs an automatic zero adjustment after removal and replacement of a weighing platform.
  • the patent US 4,503, 922_ relates to an electronic personal scale with a flat coil sensor for distance determination.
  • arms or struts are provided between a weighing surface and a base plate, which are connected to a spring device and transmit a movement of the arms by the action of a gravitational force on the sensor.
  • the sensor essentially consists of a stationary plate on which one or two coil circles are provided and a movable plate on which the arms act.
  • US 5 717 167 describes a vehicle scale with an inclinometer, which compensates for a possible inclination of the balance. Also in WO 03/007072, the skew, here a forklift, measured to correct a weight measurement.
  • No. 4,507,742 describes an aircraft weighing system with an inclinometer pair for determining the weight of the aircraft.
  • the maximum load capacity is in the foreground.
  • the requirements for the external design are very large.
  • the measuring technology impairs the freedom of design, since springs, bending beams, electronics and any cabling must not be visibly integrated into the balance as far as possible from the outside.
  • the scale should be as robust as possible in order to be able to be transported and to withstand possible impacts or other impairments.
  • the scale according to the invention comprises a base plate, a support plate arranged at a distance above the base plate for supporting an object to be weighed, resilient spacer elements which are arranged between base plate and support plate and a weighing means for determining the weight of the object.
  • the weighing means is formed by at least one inductive proximity sensor which comprises an electrical coil and a metallic, ferromagnetic or paramagnetic reference plate, wherein the at least one coil is arranged in the one of support plate or base plate and the reference plate in the other of support plate or base plate is arranged or formed thereof. That is, the coil is arranged either in the support plate or the base plate and the reference plate is arranged in each case in the other of these two plates or is formed by this.
  • This scale requires relatively few and only small items, which are also hardly susceptible to interference. Furthermore, they are inexpensive. The individual parts need not be mechanically or electronically connected to one another for the purpose of evaluating the measurement, so that they hardly influence the external shape of the balance.
  • This scale is suitable in particular, but not exclusively as a personal scale or household scale. The scale is particularly suitable for weighing non-stationary objects, such as babies.
  • the proximity sensor uses the same measuring principle as disclosed in EP 0 913 857.
  • a method and a device for the adjustment of a bonding head of a bonder are described, which use an inductive distance measurement as the measuring principle.
  • the spacer elements are arranged distributed in an edge region of the base plate and the support plate and the at least one proximity sensor is located in the middle region of the base plate and the support plate. Since an inductive proximity sensor is used, even the smallest distance deviations can be measured.
  • the weighing means consists only of inductive proximity sensors and these from flat coils integrated in a printed circuit board as well as associated reference plates, the balance is very robust. It is advantageous that the inductive proximity sensors allow a contactless measurement and no cable connections are necessary. As a result, the support plate or all parts which come into contact with the object to be measured can be arranged completely separate from all the electronics.
  • Figure 1 is a view of a scale according to the invention according to a first Embodiment from above;
  • Figure 2 is a side view of the balance according to Figure 1;
  • FIG. 3 shows a cross section through the balance according to FIG. 1;
  • Figure 4 is an enlarged view of a detail according to Figure 3;
  • FIG. 5 shows a side view of a balance according to a second embodiment of the invention
  • FIG. 7 is an enlarged view of a detail according to FIG. 6.
  • FIGS. 1 to 4 show a first exemplary embodiment of the balance according to the invention. It has a base plate 1 and a support plate 2 arranged above it. Between the two plates 1, 2 resilient spacers 3 are arranged so that between the plates 1, 2, a cavity 7 is formed. When loading the support plate 2 with an object to be weighed, the spacer elements 3 are compressed and the distance between the support plate 2 and the base plate 1 is reduced.
  • the two plates 1, 2 are rectangular in this example, wherein the support plate 2 is larger than the base plate 1. However, they can have any one and different shape. They can also be made of any material, the support plate 2 must be stable enough to carry an object to be weighed without deformation.
  • the platen 2 and the base plate 1 are made of metal. However, they can also be made of plastic or glass, for example.
  • the base plate 1 is preferably substantially planar. formed in parallel.
  • the support plate 2 may be plane-parallel, form a Aufiiahmeschale or have another optimized for receiving an object to be weighed shape.
  • the resilient spacer elements 3 may also be arbitrarily shaped, with their elastic recoverability defines the maximum load capacity of the balance.
  • there it is also possible for there to be three or, depending on the shape of the two plates 1, 2 or the spacer elements 3, one or two or more than four spacer elements.
  • the spacer elements 3 are in this example metal diaphragm springs, which are bent from a continuous sheet and provided with concentric areas. But it can also use leaf springs, coil springs or other suitable spring elements with sufficiently large elastic restoring force.
  • the spacers 3 are mounted on the base plate 1 and the support plate 2 is loosely on them.
  • the support plate 2 can also be firmly connected to the spacer elements 3 or the spacer elements 3 can be mounted on the support plate 2 and rest loosely on the base plate 1.
  • the balance further comprises a weighing means for determining the weight of the object to be weighed.
  • this weighing means is at least one inductive proximity sensor.
  • the balance therefore has a sensor unit 4 with a printed circuit board 40.
  • On the circuit board 40 four electric coils 41, 42, 43, 44 are arranged, forming four corners of a square.
  • the sensor unit 4 is arranged in this example in the central region, more precisely here in the middle of the base plate 1 and the support plate 2. However, it can also be arranged at a different location.
  • the individual coils 41, 42, 43, 44 may be arranged on different circuit boards instead of on a common circuit board 40, which are arranged distributed over the base plate 1 or the support plate 2.
  • another number of Coils are used, in particular one or three. In the case of only one coil, however, only a weight measurement, but not a skew correction can be performed. This requires three sensors.
  • the coils 41, 42, 43, 44 are preferably of identical construction and in this exemplary embodiment they are flat coils formed from printed conductors, as described in EP 0 913 857. Each coil forms part of a proximity sensor.
  • the counterpart to this is formed by a reference plate 20, which is metallic, ferromagnetic or paramagnetic. It may, as shown in Figure 4, be part of the support plate 2, the corresponding surface of the plate may be corresponding metallized or coated or the reference plate may be attached to the support plate 2.
  • a common reference plate 20 can be used for all proximity coils 41, 42, 43, 44 or each coil can be assigned its own reference plate.
  • the circuit board 40 is mounted on a cavity 8 of the base plate 1 on this, in which the arranged on the circuit board 40, not shown here electronic components can protrude.
  • the printed circuit board 40 is connected to a transmitter 5, which has a display unit 50.
  • the evaluation electronics 5 can also be integrated on the printed circuit board 40 and the display unit 50 can be connected directly afterwards or, as shown here, at a distance thereto.
  • the connection between the printed circuit board 40 and the display unit 50 is preferably carried out by means of electrical cables, which extend in a connecting channel 6 in the example shown here. However, an infrared signal transmission, radio or other wireless signal transmission means may be used.
  • the printed circuit board 40 can also be fastened to it via a cavity 8 of the support plate 2 and the reference plate 10 or plates are arranged in or on the base plate 1.
  • the spacer elements 3 are preferably likewise fastened to the support plate 2.
  • the operation of the balance is the same and corresponds to the measuring principle described in EP 0 913 857:
  • the coils are energized with an alternating current and generate a magnetic field. If the distance between the reference plate 10, 20 and coil 41, 42, 43, 44 is changed by resting an object to be weighed on the support plate 2, then the ohmic resistance or the inductance of the coil changes as a function of the change in distance.
  • a possible measuring principle is as follows: the four signals U1, U2, U3, U4 of the four coils 41, 42, 43, 44 are summed in a sum amplifier, in parallel a possible inclination of the plate in comparison with the vertical is calculated in a tilt calculator, for example, by forming the differences between the signal of the fourth coil with the third and the first coil and the sum or difference of these two differences as a correction value in a correction calculator.
  • the correction calculator the sum of the summation amplifier is corrected with the correction value, thereby obtaining a weight signal which takes into account a possible skew of the plate.
  • This signal can now be provided with a corresponding calibration value and displayed as a kg or pound indication on the display 50 or forwarded to a printer or to another electronic unit.
  • the scale can also be used without skew correction.
  • the inventive scale is thus robust and allows a great deal of flexibility in the external design of the balance.

Abstract

La présente invention concerne une balance (1) présentant une plaque de réception (2) située au-dessus de la plaque de base (1) à distance de celle-ci et destinée à recevoir un objet à peser, et des éléments d'espacement (3) qui se trouvent entre la plaque de base (1) et la plaque de réception (2). La balance comprend également un moyen de pesée destiné à déterminer la masse de l'objet, ce moyen de pesée étant au moins un capteur de proximité inductif (10, 20, 4). Ladite balance a une structure robuste et est très flexible quant à sa forme extérieure.
EP08733811A 2007-05-04 2008-04-23 Balance Withdrawn EP2145162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7342007 2007-05-04
PCT/CH2008/000185 WO2008134906A1 (fr) 2007-05-04 2008-04-23 Balance

Publications (1)

Publication Number Publication Date
EP2145162A1 true EP2145162A1 (fr) 2010-01-20

Family

ID=39576012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08733811A Withdrawn EP2145162A1 (fr) 2007-05-04 2008-04-23 Balance

Country Status (3)

Country Link
US (1) US20100133016A1 (fr)
EP (1) EP2145162A1 (fr)
WO (1) WO2008134906A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008049261A1 (fr) * 2006-10-24 2008-05-02 Carag Ag Balance
US8796565B2 (en) * 2010-11-05 2014-08-05 Rubbermaid Commercial Products, Llc Scale with dishwasher safe cover
DE102013216048A1 (de) * 2013-08-13 2015-02-19 BSH Bosch und Siemens Hausgeräte GmbH Personenwaage
US9759599B2 (en) 2015-06-15 2017-09-12 Withings Weighing device having inductive sensing elements
US10309823B2 (en) 2016-01-08 2019-06-04 Withings Thin weighing scale with a sandwich structure
CN107305142A (zh) * 2016-04-22 2017-10-31 深圳富泰宏精密工业有限公司 称重系统、手持装置及手持装置组件
US10267672B2 (en) * 2016-12-29 2019-04-23 Withings Thin weighing scale using ultrasonic waves and method using same
US11237041B2 (en) * 2019-02-19 2022-02-01 Pelstar, Llc Systems and methods for controlling a scale

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JPS57206832A (en) * 1981-06-15 1982-12-18 Tanita Seisakusho:Kk Induction type electronic balance
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US4503922A (en) * 1983-05-26 1985-03-12 Bitronics, Inc. Electronic bathroom scale apparatus using planar coil sensors
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WO1987004786A1 (fr) * 1986-02-03 1987-08-13 Matsushita Electric Industrial Co., Ltd. Dispositif detecteur de poids
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US4800973A (en) * 1988-03-04 1989-01-31 Shlomo Angel Portable electronic scale of minimal thickness and weight
DE68900857D1 (de) * 1988-05-17 1992-04-02 Aran Eng Dev Ltd Tragbare waage.
US5050034A (en) * 1990-01-22 1991-09-17 Endress U. Hauser Gmbh U. Co. Pressure sensor and method of manufacturing same
US5167290A (en) * 1990-09-24 1992-12-01 John Borchard Springs for use in a compact self-adjusting weighing system
KR0128554B1 (ko) * 1994-07-25 1998-04-09 배순훈 전자렌지의 중량 감지장치
US5717167A (en) * 1995-01-24 1998-02-10 Lts Scale Corp. Device and method for weighing solid waste with an angle-correction scale
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EP1357370A1 (fr) * 2002-04-24 2003-10-29 Esec Trading S.A. Capteur de force inductif
FI20041516A (fi) * 2004-11-25 2006-05-26 Lappset Group Oy Varmatoiminen voima-anturi, kytkentäjärjestely, leikkikenttäväline ja menetelmä sen asentamiseksi
WO2008049261A1 (fr) * 2006-10-24 2008-05-02 Carag Ag Balance
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Also Published As

Publication number Publication date
WO2008134906A1 (fr) 2008-11-13
US20100133016A1 (en) 2010-06-03

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