WO1997030332A9 - MEASURING SPRING FOR INDUCTIVE FORCE MEASUREMENT - Google Patents
MEASURING SPRING FOR INDUCTIVE FORCE MEASUREMENTInfo
- 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
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 9
- 230000001939 inductive effect Effects 0.000 title claims abstract description 6
- 229910000639 Spring steel Inorganic materials 0.000 claims abstract description 16
- 238000005452 bending Methods 0.000 claims abstract description 10
- 239000000919 ceramic Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001702 transmitter Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910000529 magnetic ferrite Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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
The invention relates to a device for inductive force measurement, in which a measuring spring is used which consist of a tension-free spring steel plate (1). In one plane said spring is shaped as a three-pronged fork in such a manner that the two outer prongs are the fixable ground element (2, 2') and the central prong is a movable ground element (3). The bending point (9, 9') is in the region of the recesses (7, 7') outside the clamping zone. The measuring spring is suitable for thread force measurement on a moving thread.
Description
Messfeder zur induktiven Kraftmessung Measuring spring for inductive force measurement
Die Erfindung betrifft eine verbesserte Messfeder zur induktiven Kraftmessung, bestehend aus einer spannungsfreien Federstahlplatte mit einem bewegbaren Masseteil und einem fixierbaren Masseteil, insbesondere zur Überwachung der Fadenzugkraf an einem laufenden Faden .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.
Aus der CH-A-671 829 ist eine Vorrichtung zur Überwachung der Fadenzugkraft an einem laufenden Faden bekannt, welche aus einer Federstahlplatte mit einem axialsymmetrischen bewegbaren Masseteil und einem axialsymmetrischen fixierbaren Masseteil besteht. Das fixierbare Masseteil weist eine Anzahl von inneren Aussparungen auf. Das bewegbare Masseteil ist über seine ganze Länge in einer Ebene auslenkbar. Die Biegestelle befindet sich innerhalb der Einspannung des fixierbaren Masseteils. Hier besteht der Nachteil darin, dass Zugkräfte im festen, im Halter eingespannten Masseteil entstehen, die zu Hysterese des Nullpunkts führen können. Die Grosse der Hysterese ist dabei abhängig von der vorherigen Auslenkung und von den aktuellen Einspannbedingungen. Ausserdem erfordert jede weitere Aussparung einen erheblichen technischen Aufwand bei der Herstellung einer solchen Feder.From CH-A-671 829 a device for monitoring the yarn tension on a running thread is known, 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. Here, 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. In addition, each additional recess requires considerable technical effort in the production of such a spring.
Aufgabe der Erfindung ist es, einen Fadenzugkraftaufnehmer zur Verfügung zu stellen, der weitgehend hystereεefrei arbeitet, der einfach und
wirtschaftlicher herzustellen und zum Einbau in ein Messgerät geeignet ist.The object of the invention is to provide a Fadenzugkraftaufnehmer available that works largely hystere-free, the simple and more economical to manufacture and suitable for installation in a measuring device.
Die erfindungsgemässe Aufgabe wird dadurch gelöst, dass die Messfeder als dreizinkige Gabel in einer Ebene so ausgebildet ist, dass die beiden äusseren Zinken den fixierbaren Masseteil und die mittlere Zinke einen um die Biegestelle bewegbaren Masseteil darstellen. Das bewegte Masseteil ist über seine ganze Länge in einer Ebene auslenkbar.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.
Der Übergangsbereich zwischen festem Masseteil und bewegbarem Masseteil ist als Biegestelle ausgebildet und liegt ausserhalb der Einspannzone. Das hat den Vorteil, dass keine Zugkräfte innerhalb der Einspannung im festen Masseteil auftreten und somit auch praktisch keine Hysterese des Nullpunktes auftritt.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.
Die Federstahlplatte weist bevorzugt eine Dicke von 0,4 mm bis 1,5 mm auf. Bei einer Dicke von weniger als 0,4 mm ist die Feder zu weich, d. h., die Frequenz der Eigenresonanz könnte die Messung verfälschen; bei einer Dicke über 1,5 mm liegt der Messbereich über 10 N. Bei Fadenkräften beträchtlich über 10 N nimmt die Unlinearität des Aufnehmers schnell zu.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.
Die im fixierbaren Masseteil vorgesehenen Aussparungen sind paarweise angelegt und dienen zur Befestigung der Messfeder, die zwischen dem oberen und unteren Teil des Halters, der gleichzeitig die Magnetspulen trägt, eingeklemmt wird. Die beiden von den Zinkenspitzen entferntesten Aussparungen bilden die Biegestelle der Messfeder.
Die Erfindung soll anhand einer Zeichnung näher beschrieben werden, es zeigen: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. The invention will be described in more detail with reference to a drawing, in which:
Fig. 1 eine erfindungsgemässe Messfeder Fig. 2 eine Messfeder nach dem Stand der Technik.Fig. 1 is an inventive measuring spring Fig. 2 is a measuring spring according to the prior art.
Fig. 3 ein Querschnitt durch einen Messgeber zur Aufnahme der erfindungsgemässen Messfeder Fig. 4 eine schematische Ansicht eines im Betrieb befindlichen Messgebers.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.
In Fig. 1 ist eine Aufsicht auf eine erfindungsgemässe Federstahlplatte 1 gezeigt. Die Federstahlplatte 1 besteht aus einem fixierbaren Masseteil 2, einem symmetrischen Masseteil 2 - und einem bewegbaren mittleren Masseteil 3, der an seinem freien Ende mit einem runden Masseteil 4 versehen ist. Der Masseteil 4 dient einerseits zum Massenausgleich, damit die Erdanziehung keinen Einfluss auf die Messung ausübt. Andererseits stellt die flächenhafte runde Ausführung sicher, dass die Auslenkung der Messfeder von den sich darüber und darunter befindlichen Spulen sicher erfasst werden kann. Auf der Gegenseite 5 des Masseteils 4 ist eine nicht gezeigte Einrichtung zur Kraftleitung vorgesehen. Es sind Aussparungen 6,6' und 8,8' zur Befestigung der Federstahlplatte 1 und damit des fixierbaren Masseteil 2,2' vorgesehen. Aussparungen 7 und 1 - bilden gleichzeitig den Bereich wo sich Biegestellen 9,9' befinden.In 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. On the other hand, the planar round design ensures that the deflection of the measuring spring can be reliably detected by the coils located above and below. On the opposite side 5 of the mass part 4, a device not shown for power line is provided. There are recesses 6,6 'and 8,8' for fixing the spring steel plate 1 and thus the fixable mass part 2,2 'is provided. Recesses 7 and 1 - at the same time form the area where bends are 9,9 'are located.
Fig. 2 zeigt eine Messfeder aus einer Federstahlplatte 11 nach dem Stand der Technik. Die Federstahlplatte 11 besteht gleichfalls aus einem fixierbaren Masseteil 12, einem symmetrischen Masseteil 12', jedoch aus bewegbaren mittleren Masseteilen 13, 13* und 14. Der Masseteil 14 ist als Scheibe ausgebildet. Der bewegbare Masseteil 13 ist an einen Ende 15 zur Aufnahme einer nicht gezeigten Krafteinleitung vorgesehen. Je ein Paar Aussparungen 16,
16' und 18, 18' sind zur Fixierung und die Aussparungen 17, 17' und 17a, 17a' sind so ausgebildet, dass sich zwischen ihnen die Biegestellen 19,19' ergeben.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.
In Fig. 3 ist ein Halter 20 gezeigt, der zur Aufnahme der erfindungsgemässen Messfeder in Form der Federstahlplatte 1 geeignet ist. Dabei kommt der runde Masseteil 4 zwischen die Ferritkerne einer Spule 21 zu liegen. Der Halter 20, 20' ist an einem Ende mit einem Kopfteil 22 und einem Deckel 23 versehen. Der Messgeber ist mit einem rohrförmigen Gehäuse 24 umgeben. Im Messgeber ist eine Apparatedose 25 mit elektrischen Zuleitungen 26 zu je einem Anschlussprint 27 mit der Spule 21 verbunden. Am Ende der Federstahlplatte 1 ist ein Keramikröhrchen als Fadenführer zur Krafteinleitung 28 vorgesehen.In Fig. 3, a holder 20 is shown, which is suitable for receiving the novel measuring spring in the form of the spring steel plate 1. In this case, 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. In the encoder an apparatus socket 25 is connected to electrical leads 26 to a respective Anschlußprint 27 with the coil 21. At the end of the spring steel plate 1, a ceramic tube is provided as a thread guide for force introduction 28.
In Fig. 4 wird mit dem Bezugszeichen 29 ein laufender Faden gezeigt, dessen Spannung zu messen ist und welcher über zwei mit Nuten versehene Keramikstifte 30 und 30' über das auf einem Ende der Federstahlplatte 1 angebrachte Keramikröhrchen 28 geführt wird. Anstelle von Keramikröhrchen 28 können auch Fadenleitrollen vorgesehen werden.
In Fig. 4, 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. Instead of ceramic tube 28 and thread guide rollers can be provided.
Claims
1. Messfeder zur induktiven Kraftmessung, bestehend aus 5 einer spannungsfreien Federstahlplatte (1) mit einem bewegbaren Masseteil und einem fixierbaren Masseteil, dadurch gekennzeichnet, dass die Messfeder als dreizinkige Gabel in einer Ebene so ausgebildet ist, dass die beiden äusseren Zinken den fixierbaren 0 Masseteil (2,2') und die mittlere Zinke einen um die Biegestelle (9,9') bewegbaren Masseteil (3) darstellen, wobei die Biegestelle (9,9') zwischen dem fixierbaren Masseteil (2,2') und dem bewegbaren Masseteil (3) ausserhalb der Einspannzone liegt . 51. measuring spring for inductive force measurement, consisting of 5 a tension-free spring steel plate (1) with a movable mass part and a fixable mass part, characterized in that the measuring spring is designed as a three-pronged fork in a plane so that the two outer prongs the fixable 0 mass part (2,2 ') and the central prong one about the bending point (9,9') movable mass portion (3), wherein the bending point (9,9 ') between the fixable mass portion (2,2') and the movable mass portion (3) is outside the clamping zone. 5
2. Messfeder nach Anspruch 1, dadurch gekennzeichnet, dass im fixierbaren Masseteil (2,2') Aussparungen (6,6') und Aussparungen (7,7') und (8,8') vorgesehen sind.2. measuring spring according to claim 1, characterized in that in the fixable mass portion (2,2 ') recesses (6,6') and recesses (7,7 ') and (8,8') are provided.
3. Messfeder nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass die Federstahlplatte (1) eine Dicke von 0,4 mm bis 1 , 5 mm aufweist.
3. measuring spring according to claims 1 to 3, characterized in that the spring steel plate (1) has a thickness of 0.4 mm to 1, 5 mm.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9528851A JP2000504833A (en) | 1996-02-14 | 1997-02-05 | Measuring spring for force measurement by electric induction |
| EP97900929A EP0880685A1 (en) | 1996-02-14 | 1997-02-05 | Measuring spring for inductive force measurement |
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 (en) | 1997-08-21 |
| WO1997030332A9 true WO1997030332A9 (en) | 1998-03-05 |
Family
ID=4185611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CH1997/000037 WO1997030332A1 (en) | 1996-02-14 | 1997-02-05 | Measuring spring for inductive force measurement |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0880685A1 (en) |
| JP (1) | JP2000504833A (en) |
| KR (1) | KR19990087043A (en) |
| WO (1) | WO1997030332A1 (en) |
Families Citing this family (2)
| 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 (en) * | 2020-01-03 | 2020-04-28 | 深圳市创想三维科技有限公司 | 3D printer strain sensor, 3D printhead assembly and 3D printer |
Family Cites Families (3)
| 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 |
-
1997
- 1997-02-05 KR KR1019980706276A patent/KR19990087043A/en not_active Application Discontinuation
- 1997-02-05 JP JP9528851A patent/JP2000504833A/en active Pending
- 1997-02-05 EP EP97900929A patent/EP0880685A1/en not_active Withdrawn
- 1997-02-05 WO PCT/CH1997/000037 patent/WO1997030332A1/en not_active Application Discontinuation
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