EP0460442A1 - Dispositif de mesure de l'épaisseur et/ou de l'inégalite de rubans de fibres - Google Patents

Dispositif de mesure de l'épaisseur et/ou de l'inégalite de rubans de fibres Download PDF

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Publication number
EP0460442A1
EP0460442A1 EP91108075A EP91108075A EP0460442A1 EP 0460442 A1 EP0460442 A1 EP 0460442A1 EP 91108075 A EP91108075 A EP 91108075A EP 91108075 A EP91108075 A EP 91108075A EP 0460442 A1 EP0460442 A1 EP 0460442A1
Authority
EP
European Patent Office
Prior art keywords
measuring
rollers
leaf spring
sliver
strain gauges
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.)
Granted
Application number
EP91108075A
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German (de)
English (en)
Other versions
EP0460442B1 (fr
Inventor
François BAECHLER
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.)
Zellweger Luwa AG
Original Assignee
Zellweger Uster AG
Zellweger Luwa AG
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Filing date
Publication date
Application filed by Zellweger Uster AG, Zellweger Luwa AG filed Critical Zellweger Uster AG
Publication of EP0460442A1 publication Critical patent/EP0460442A1/fr
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Publication of EP0460442B1 publication Critical patent/EP0460442B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/22—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to presence of irregularities in running material

Definitions

  • the invention relates to a device for measuring the thickness and / or the non-uniformity of fiber slivers, in particular on spinning preparation machines, with a compression member compacting the fiber sliver and with a mechanical measuring device for the thickness or the non-uniformity formed by a leaf spring provided with strain gauges of the sliver.
  • Devices of this type are used for systems for regulating strip weight fluctuations and for quality recording on cards, cards and draw frames and serve to keep the number fluctuations in the yarn so small that they do not interfere in the finished product.
  • the main differences of the known regulating systems lie in the measuring element, for which essentially three types, the so-called active-pneumatic measuring element, the roller measuring system and the fiber pressing system are known. With regard to the first two measuring elements, reference is made to USTER News Bulletin No. 30, June 1982, and with regard to the latter measuring element to US-A-4,864,853.
  • the fiber sliver is scanned by the measuring element formed by a leaf spring in a measuring channel which is provided in a measuring part which is interchangeably arranged on the compression element.
  • This has the advantage that it is no longer necessary to replace the entire compression element in order to adapt to changing band numbers, but only the measuring part.
  • This device has proven itself extremely well in practice, but it has been shown that the measuring accuracy has certain limits. It can be assumed that this is directly related to the compression of the sliver, the so-called fill factor, which should be limited by the spatial separation of the compression element on the one hand and the measuring element on the other.
  • the sliver is compressed by a pair of measuring rollers, between which the sliver is pressed together.
  • the compression element and measuring element are not spatially separated, but both functions are performed by the measuring rollers.
  • the two rollers are designed to prevent the sliver from escaping laterally from the nip, overlapping one another, either as stepped rollers or as so-called groove and key rollers.
  • the groove and key roller measuring element is also known under the name Tongue and Groove.
  • the invention is now intended to provide a device of the type mentioned at the outset which, on the one hand, enables a very high measurement accuracy and, on the other hand, has the lowest possible inertia and can therefore also reliably detect small and short strip weight fluctuations.
  • the compression element is formed by a pair of rollers which delimit two sides of a rectangular measuring space which is closed on three sides and on the fourth side of which the measuring element is arranged.
  • the arrangement of the measuring space between the measuring rolls compacting the fiber sliver has the advantage that the measuring accuracy increases. Because this means that the sliver is actively driven at the measuring point and this increases the compression of the sliver and thus the filling factor in the measuring room. And since the measurement accuracy increases with increasing fill factor, the measurement accuracy will increase.
  • the measuring element formed by a leaf spring provided with strain gauges makes it possible to measure even very short irregularities, even at high belt speeds.
  • a fiber sliver or a number of up to eight fiber slivers 1 is brought together by a conically converging funnel 2 and fed to a measuring room 3.
  • the measuring space 3 has a rectangular cross section, which is closed on three sides and a measuring cell 4 with a measuring element 5 is arranged on the fourth side.
  • the means delimiting the measuring space 3 contain two rollers 6 and 7, driven in the direction of the arrows shown in FIG. 2, with a smooth or corrugated circumference. Connected to one of these rollers, as shown in the roller 7 on the right in FIGS. 1 and 2, is a guide roller 8 which projects beyond this in diameter and whose shoulder adjacent to the roller 7 laterally delimits the measuring space 3. Of course this can Limitation also take place by other means, for example by a fixed guide plate. Another possibility is shown in FIG. 7.
  • the center distance of the two rollers 6 and 7 is adjustable and thus also the cross-section of the measuring room 3 and the degree of compression of the fiber sliver 1 in the measuring room 3. If this description refers to a sliver, then the sliver in the measuring room 3 is always meant. This is a single sliver, regardless of how many slivers 1 are fed to the hopper 2.
  • the device shown in Figures 1 and 2 is used on a draw frame, then it is arranged at the outlet and / or at the inlet of the drafting system.
  • the cross-section of the fiber sliver 1 passing through the measuring space 3 is scanned by the measuring element 5, as a result of which a corresponding cross-sectional signal is supplied to control electronics.
  • the control electronics process this into a suitable regulating and / or control signal which is fed to a regulating drive for the drafting roller pairs of the drafting system.
  • the sliver will exert a certain force or a certain pressure on the measuring element 5, the size of which is proportional to the thickness of the sliver for a given cross section of the measuring space 3 and thus also reliably indicates non-uniformities of this thickness.
  • the measuring member 5 is designed to measure the acting pressure and, according to FIGS. 3 and 4, consists of a carrier 9 and a leaf spring 10 carried by the latter, which has a thickening 11 at one end and is fixed to the carrier 9 thereon connected, preferably jammed.
  • the leaf spring 10 rests on corresponding webs of the carrier 9, between which an intermediate space 12 is formed which enables the leaf spring 10 to deflect due to the action of a force F.
  • the leaf spring 10 has in its contact area with the sliver 1 a web 13 which carries a measuring plate 14, which rests on the sliver 1 and receives its pressure F, made of abrasion-resistant material, preferably of hard metal or ceramic.
  • a stop 15 aligned with the web 13 for limiting the deflection of the leaf spring 10 in order to prevent the leaf spring 10 from being overstretched or overstressed.
  • strain gauges D1 to D4 are arranged, which are glued or sputtered onto the leaf spring.
  • the sliver 1 running through the measuring space 3 presses against the measuring plate 14 with a force F, whereby the leaf spring 10 is pressed against the intermediate space 12 and thus deformed. This creates the strain gauges D2 and D4 adjacent to measuring plate 14 and strain at strain gauges D1 and D3 adjacent to thicker end 11 of leaf spring 10.
  • FIG. 5 In which the elongation E, which is a function of the force F, is shown over the deflection P of the leaf spring 10.
  • Each strain gauge D1 to D4 has a certain electrical resistance R1 to R4, which resistances are all the same. Since the relative change in resistance when the leaf spring 10 bends is known to be proportional to the elongation of the strain gauges, the determination of the elongation can be carried out by measuring this change in resistance. 6 with a Wheatstone bridge circuit, which consists of four branches, which are formed by the ring-shaped interconnected resistors R1 to R4.
  • the measuring cell 4 has a corresponding connection cable 16 for the electrical connection of the strain gauges D1 to D4 and a hose connection 17.
  • the latter is used to connect a compressed air hose for the automatic cleaning and cooling of the measuring cell 4 and the measuring element 5 in the area of the intermediate space 12 and in the area of the web with the measuring plate 14.
  • the air is supplied to the connection 17 in an impulse in the form of compressed air pulses, the frequency of which and duration is adjustable.
  • FIG. 7 shows a variant of the device shown in FIGS. 1 and 2, in which the side of the measuring space 3 opposite the measuring cell 4 is not closed off by the shoulder of a guide roller or by a guide plate, but by the circumference of a guide roller 18 , which is arranged perpendicular to the two rollers 6, 7, engages between them and is drivingly coupled to the rollers 6, 7 via gears 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Treatment Of Fiber Materials (AREA)
EP91108075A 1990-05-30 1991-05-18 Dispositif de mesure de l'épaisseur et/ou de l'inégalite de rubans de fibres Expired - Lifetime EP0460442B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1832/90A CH681310A5 (fr) 1990-05-30 1990-05-30
CH1832/90 1990-05-30

Publications (2)

Publication Number Publication Date
EP0460442A1 true EP0460442A1 (fr) 1991-12-11
EP0460442B1 EP0460442B1 (fr) 1995-01-18

Family

ID=4219646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108075A Expired - Lifetime EP0460442B1 (fr) 1990-05-30 1991-05-18 Dispositif de mesure de l'épaisseur et/ou de l'inégalite de rubans de fibres

Country Status (6)

Country Link
US (1) US5123280A (fr)
EP (1) EP0460442B1 (fr)
JP (1) JP2943087B2 (fr)
AT (1) ATE117383T1 (fr)
CH (1) CH681310A5 (fr)
DE (1) DE59104291D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19500189A1 (de) * 1995-01-05 1996-07-11 Rieter Ingolstadt Spinnerei Verfahren zur Anpreßung eines Tastorgans an einen Faserverband in einer Bandführung und Vorrichtung zu deren Erzeugung
EP0626472B2 (fr) † 1993-04-02 1999-12-29 Trützschler GmbH & Co. KG Dispositif pour mesurer l'épaisseur d'une matière fibreuse avec un guide-mèche pour guider la mèche à l'entrée du système d'étirage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4142038C5 (de) * 1991-12-19 2012-03-15 Rieter Ingolstadt Gmbh Vorrichtung zur Verarbeitung einer Mehrzahl von Faserbändern
US5626512A (en) * 1995-05-04 1997-05-06 Minnesota Mining And Manufacturing Company Scouring articles and process for the manufacture of same
IT1302166B1 (it) * 1997-09-17 2000-07-31 Truetzschler & Co Dispositivo su uno striratoio per la misura di una nastro di fibrecomposito formato da nastri di fibre
WO2017146809A1 (fr) 2016-02-25 2017-08-31 Massachusetts Institute Of Technology Élément et système de détection de force directionnelle
CN106087151A (zh) * 2016-08-19 2016-11-09 安徽华茂纺织股份有限公司 摇架弧爪调整专用工具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH557516A (de) * 1972-05-01 1974-12-31 Maremont Corp Vorrichtung zum feststellen von dickeunterschieden in stapelfaserbaendern.
US4864853A (en) * 1986-01-16 1989-09-12 Zellweger Uster Ltd. Apparatus for measuring the thickness of fibre slivers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680266A (en) * 1948-07-26 1954-06-08 John G Kershaw Sliver condensing
CH553981A (de) * 1972-05-10 1974-09-13 Rieter Ag Maschf Vorrichtung zur messung von dichteschwankungen eines faserbandes in spinnereimaschinen.
DE3569760D1 (en) * 1985-02-15 1989-06-01 Rieter Ag Maschf Apparatus for the continuous mass control of a fibre ribbon
DE3913548C2 (de) * 1989-04-25 2000-08-31 Truetzschler Gmbh & Co Kg Vorrichtung zum Messen der Banddicke und der Ungleichmäßigkeit eines Faserbandes an Spinnereivorbereitungsmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH557516A (de) * 1972-05-01 1974-12-31 Maremont Corp Vorrichtung zum feststellen von dickeunterschieden in stapelfaserbaendern.
US4864853A (en) * 1986-01-16 1989-09-12 Zellweger Uster Ltd. Apparatus for measuring the thickness of fibre slivers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0626472B2 (fr) † 1993-04-02 1999-12-29 Trützschler GmbH & Co. KG Dispositif pour mesurer l'épaisseur d'une matière fibreuse avec un guide-mèche pour guider la mèche à l'entrée du système d'étirage
DE19500189A1 (de) * 1995-01-05 1996-07-11 Rieter Ingolstadt Spinnerei Verfahren zur Anpreßung eines Tastorgans an einen Faserverband in einer Bandführung und Vorrichtung zu deren Erzeugung
DE19500189B4 (de) * 1995-01-05 2006-09-14 Rieter Ingolstadt Spinnereimaschinenbau Ag Verfahren zur Anpressung eines Tastorgans an einen Faserverband in einer Bandführung und Vorrichtung zu deren Erzeugung

Also Published As

Publication number Publication date
US5123280A (en) 1992-06-23
ATE117383T1 (de) 1995-02-15
EP0460442B1 (fr) 1995-01-18
JPH04228673A (ja) 1992-08-18
JP2943087B2 (ja) 1999-08-30
CH681310A5 (fr) 1993-02-26
DE59104291D1 (de) 1995-03-02

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