WO1997030332A9 - Ressort de mesure pour la mesure dynamometrique par induction - Google Patents

Ressort de mesure pour la mesure dynamometrique par induction

Info

Publication number
WO1997030332A9
WO1997030332A9 PCT/CH1997/000037 CH9700037W WO9730332A9 WO 1997030332 A9 WO1997030332 A9 WO 1997030332A9 CH 9700037 W CH9700037 W CH 9700037W WO 9730332 A9 WO9730332 A9 WO 9730332A9
Authority
WO
WIPO (PCT)
Prior art keywords
fixable
spring
mass portion
measuring spring
mass part
Prior art date
Application number
PCT/CH1997/000037
Other languages
German (de)
English (en)
Other versions
WO1997030332A1 (fr
Filing date
Publication date
Application filed filed Critical
Priority to EP97900929A priority Critical patent/EP0880685A1/fr
Priority to JP9528851A priority patent/JP2000504833A/ja
Publication of WO1997030332A1 publication Critical patent/WO1997030332A1/fr
Publication of WO1997030332A9 publication Critical patent/WO1997030332A9/fr

Links

Definitions

  • the invention relates to an improved measuring spring for inductive force measurement, consisting of a tension-free spring steel plate with a movable mass part and a fixable mass part, in particular for monitoring the yarn tension on a running thread.
  • a device for monitoring the yarn tension on a running thread which consists of a spring steel plate with an axially symmetric movable mass part and an axially symmetric fixable mass part.
  • the fixable mass part has a number of internal recesses.
  • the movable mass part is deflectable over its entire length in one plane. The bending point is located within the clamping of the fixable mass part.
  • the disadvantage is that tensile forces arise in the solid, clamped in the holder mass part, which can lead to hysteresis of the zero point.
  • the size of the hysteresis depends on the previous deflection and the current clamping conditions.
  • each additional recess requires considerable technical effort in the production of such a spring.
  • the object of the invention is to provide a Fadenzugkraftiersacrificing available that works largely hystere-free, the simple and more economical to manufacture and suitable for installation in a measuring device.
  • the object of the invention is achieved in that the measuring spring is designed as a three-pronged fork in a plane so that the two outer prongs constitute the fixable mass part and the central prong a mass part movable about the bending point.
  • the moving mass part is deflected over its entire length in one plane.
  • the transition region between the solid mass part and the movable mass part is designed as a bending point and is outside the clamping zone. This has the advantage that no tensile forces occur within the clamping in the solid mass part and thus virtually no hysteresis of the zero point occurs.
  • the spring steel plate preferably has a thickness of 0.4 mm to 1.5 mm. At a thickness of less than 0.4 mm, the spring is too soft, i. h., the frequency of self-resonance could falsify the measurement; if the thickness exceeds 1.5 mm, the measuring range is more than 10 N. If the thread forces are considerably more than 10 N, the nonlinearity of the pickup increases rapidly.
  • the recesses provided in the fixable part of the mass are arranged in pairs and serve to fasten the measuring spring, which is clamped between the upper and lower part of the holder which simultaneously carries the magnetic coils.
  • the two recesses furthest from the tine tips form the bending point of the measuring spring.
  • Fig. 1 is an inventive measuring spring
  • Fig. 2 is a measuring spring according to the prior art.
  • FIG. 3 shows a cross section through a measuring transmitter for receiving the measuring spring according to the invention.
  • FIG. 4 shows a schematic view of a measuring transmitter in operation.
  • Fig. 1 is a plan view of an inventive spring steel plate 1 is shown.
  • the spring steel plate 1 consists of a fixable mass part 2, a symmetrical mass part 2 - and a movable central mass part 3, which is provided at its free end with a round mass part 4.
  • the mass part 4 serves on the one hand to balance the mass, so that gravity does not exert any influence on the measurement.
  • the planar round design ensures that the deflection of the measuring spring can be reliably detected by the coils located above and below.
  • a device not shown for power line is provided on the opposite side 5 of the mass part 4.
  • Recesses 7 and 1 - at the same time form the area where bends are 9,9 'are located.
  • Fig. 2 shows a measuring spring made of a spring steel plate 11 according to the prior art.
  • the spring steel plate 11 likewise consists of a fixable mass part 12, a symmetrical mass part 12 ', but of movable middle mass parts 13, 13 * and 14.
  • the mass part 14 is formed as a disc.
  • the movable mass part 13 is provided at one end 15 for receiving a force introduction, not shown.
  • One pair each of recesses 16, 16 'and 18, 18' are for fixing and the recesses 17, 17 'and 17a, 17a' are formed so that the bending points 19,19 'result between them.
  • a holder 20 is shown, which is suitable for receiving the novel measuring spring in the form of the spring steel plate 1.
  • the round mass part 4 comes to rest between the ferrite cores of a coil 21.
  • the holder 20, 20 ' is provided at one end with a head part 22 and a lid 23.
  • the encoder is surrounded by a tubular housing 24.
  • an apparatus socket 25 is connected to electrical leads 26 to a respective Anschlußprint 27 with the coil 21.
  • a ceramic tube is provided as a thread guide for force introduction 28.
  • a running thread is shown by the reference numeral 29, whose tension is to be measured and which is guided over two grooved ceramic pins 30 and 30 'via the mounted on one end of the spring steel plate 1 ceramic tube 28.
  • ceramic tube 28 and thread guide rollers can be provided.

Abstract

L'invention concerne un dispositif de mesure dynamométrique par induction dans lequel une plaquette (1) en acier à ressort exempte de contrainte sert de ressort de mesure. Dans un plan, ledit ressort a la forme d'une fourche à trois pointes, les deux pointes extérieures constituant un élément de masse (2, 2') pouvant être fixé et la pointe centrale constituant un élément de masse (3) mobile. Le point de flexion (9, 9') se trouve dans la zone des évidements (7, 7') situés à l'extérieur de la zone de serrage. Le ressort de mesure peut être utilisé pour effectuer des mesures de la force d'un fil, ces mesures se faisant sur un fil en déplacement.
PCT/CH1997/000037 1996-02-14 1997-02-05 Ressort de mesure pour la mesure dynamometrique par induction WO1997030332A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97900929A EP0880685A1 (fr) 1996-02-14 1997-02-05 Ressort de mesure pour la mesure dynamometrique par induction
JP9528851A JP2000504833A (ja) 1996-02-14 1997-02-05 電気誘導による力測定のための測定用ばね

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH376/96 1996-02-14
CH37696 1996-02-14

Publications (2)

Publication Number Publication Date
WO1997030332A1 WO1997030332A1 (fr) 1997-08-21
WO1997030332A9 true WO1997030332A9 (fr) 1998-03-05

Family

ID=4185611

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1997/000037 WO1997030332A1 (fr) 1996-02-14 1997-02-05 Ressort de mesure pour la mesure dynamometrique par induction

Country Status (4)

Country Link
EP (1) EP0880685A1 (fr)
JP (1) JP2000504833A (fr)
KR (1) KR19990087043A (fr)
WO (1) WO1997030332A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6809820B2 (en) * 2002-04-18 2004-10-26 National Research Council Of Canada Small particle analysis by laser induced incandescence
CN111070691A (zh) * 2020-01-03 2020-04-28 深圳市创想三维科技有限公司 3d打印机应变传感器、3d打印头组件及3d打印机

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3718047A (en) * 1969-12-26 1973-02-27 Yokogawa Electric Works Ltd Force-to-signal converter
US3969934A (en) * 1972-08-15 1976-07-20 Raskin Seymour H Load cell amplifier
CH671829A5 (en) * 1986-01-10 1989-09-29 Schweizerische Viscose Continuous wire tension measuring device - has spring steel plate with movable section deflected by applied wire tension

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