EP0460442B1 - Vorrichtung zum Messen der Dicke und/oder der Ungleichmässigkeit von Faserbändern - Google Patents

Vorrichtung zum Messen der Dicke und/oder der Ungleichmässigkeit von Faserbändern Download PDF

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Publication number
EP0460442B1
EP0460442B1 EP91108075A EP91108075A EP0460442B1 EP 0460442 B1 EP0460442 B1 EP 0460442B1 EP 91108075 A EP91108075 A EP 91108075A EP 91108075 A EP91108075 A EP 91108075A EP 0460442 B1 EP0460442 B1 EP 0460442B1
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EP
European Patent Office
Prior art keywords
measuring
rollers
leaf spring
sliver
space
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.)
Expired - Lifetime
Application number
EP91108075A
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German (de)
English (en)
French (fr)
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EP0460442A1 (de
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
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Zellweger Luwa AG
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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 unevenness of fiber slivers, in particular on spinning preparation machines, with a compression member compacting the fiber sliver and with a measuring member for the thickness or the unevenness mechanically scanning the compressed fiber sliver and 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 devices, reference is made to USTER News Bulletin No. 30, June 1982, and for the latter measuring device 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 there are certain limits to the measuring accuracy. 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 emerging laterally from the nip, overlapping one another, either as step 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 member 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 member is arranged.
  • the arrangement of the measuring space between the measuring rolls compacting the fiber sliver has the advantage that the measuring accuracy increases. 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 measuring accuracy increases with increasing fill factor, the measuring 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 are 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 space 3 and the degree of compression of the fiber sliver 1 in the measuring space 3. If this description refers to a sliver, then the sliver in the measuring space 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 element 5 is designed for measuring 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 to limit 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 strain of the strain gauges, the determination of the strain can be made 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. If you now connect a supply voltage to the connection points between the resistors R1 and R4 on the one hand and R2 to R3 on the other hand U applies, then an output voltage V proportional to the bridge detuning can be tapped at the two remaining connection points, which in turn is proportional to the sum of the strain of the individual strain gauges D1 to D4.
  • 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 Vorrichtung zum Messen der Dicke und/oder der Ungleichmässigkeit von Faserbändern Expired - Lifetime EP0460442B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=4219646

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108075A Expired - Lifetime EP0460442B1 (de) 1990-05-30 1991-05-18 Vorrichtung zum Messen der Dicke und/oder der Ungleichmässigkeit von Faserbändern

Country Status (6)

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

Families Citing this family (7)

* 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
DE4404326A1 (de) † 1993-04-02 1994-10-06 Truetzschler Gmbh & Co Kg Vorrichtung zur Messung der Stärke eines Faserbandes mit einer Bandführung zum Führen der Faserbänder am Streckwerkseinlauf
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
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 (en) 2016-02-25 2017-08-31 Massachusetts Institute Of Technology Directional force sensing element and system
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

Family Cites Families (6)

* 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
US3822590A (en) * 1972-05-01 1974-07-09 Maremont Corp Textile sliver unevenness detecting
CH553981A (de) * 1972-05-10 1974-09-13 Rieter Ag Maschf Vorrichtung zur messung von dichteschwankungen eines faserbandes in spinnereimaschinen.
EP0192835B1 (de) * 1985-02-15 1989-04-26 Maschinenfabrik Rieter Ag Vorrichtung zum kontinuierlichen Ermitteln der Masse eines Faserbandes
CH668833A5 (de) * 1986-01-16 1989-01-31 Zellweger Uster Ag Vorrichtung zum messen und/oder vergleichmaessigen der banddicke von faserbaendern.
DE3913548C2 (de) * 1989-04-25 2000-08-31 Truetzschler Gmbh & Co Kg Vorrichtung zum Messen der Banddicke und der Ungleichmäßigkeit eines Faserbandes an Spinnereivorbereitungsmaschinen

Also Published As

Publication number Publication date
EP0460442A1 (de) 1991-12-11
JP2943087B2 (ja) 1999-08-30
ATE117383T1 (de) 1995-02-15
US5123280A (en) 1992-06-23
JPH04228673A (ja) 1992-08-18
CH681310A5 (enrdf_load_stackoverflow) 1993-02-26
DE59104291D1 (de) 1995-03-02

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