EP0007374B1 - Method and apparatus for producing measuring values corresponding to the linear density of fibre slivers - Google Patents

Method and apparatus for producing measuring values corresponding to the linear density of fibre slivers Download PDF

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Publication number
EP0007374B1
EP0007374B1 EP78900227A EP78900227A EP0007374B1 EP 0007374 B1 EP0007374 B1 EP 0007374B1 EP 78900227 A EP78900227 A EP 78900227A EP 78900227 A EP78900227 A EP 78900227A EP 0007374 B1 EP0007374 B1 EP 0007374B1
Authority
EP
European Patent Office
Prior art keywords
measuring
signal
arrangement
integration
linear density
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
Application number
EP78900227A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0007374A1 (en
Inventor
Robert Moser
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.)
Maschinenfabrik Rieter AG
Original Assignee
Maschinenfabrik Rieter 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 Maschinenfabrik Rieter AG filed Critical Maschinenfabrik Rieter AG
Publication of EP0007374A1 publication Critical patent/EP0007374A1/en
Application granted granted Critical
Publication of EP0007374B1 publication Critical patent/EP0007374B1/en
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

  • the present invention concerns a method of producing measuring values corresponding to the linear density (titre) of fibre slivers producing spinning preparation, in which the fibre sliver is transported at operating speed to a pneumatic measuring funnel for establishing a manometric pressure measuring signal depending on the operating speed as well as on the linear density, which pressure measuring signal is transformed into a proportional voltage signal, and an apparatus for implementing the method with a pneumatic measuring funnel for the fibre sliver, a pneumatic/electric transducer connected pneumatically with the measuring funnel.
  • the pressure generated in the compressing device is opposed to the pressure generated in the measuring funnel, the relation between the pressure in the measuring funnel, or in one leg of a manometer respectively, and the pressure in the other leg of the manometer supposedly is a measure of the linear density of the fibre sliver solely.
  • the pressure signal generated in the measuring funnel corresponding to the linear density of the fibre sliver also depends proportionally on the fibre sliver speed
  • the compensation using the air compressing device driven at a rotational speed proportional to the fibre sliver speed results in an overcompensation.
  • the pressure generated by the air compressing device depends on the square of its rotational speed, measuring values still biased by the fibre sliver throughput speed are obtained.
  • the inventive method achieved this objective in that the voltage signal is continuously and repeatedly integrated over a time period which the fibre sliver requires for covering a path corresponding to the length of a predetermined measuring length(s), in such a way that the measured value corresponds to the linear density of the fibre sliver but is independent of its operating speed.
  • the inventive apparatus for implementing the method is characterised in that the transducer is electrically connected with an integrating circuit arrangement and that a control logic device on one hand is connected with a proximity indicator co-operating with a gear in the drive to the feed rollers of a spinning preparatory machine, and on the other hand is connected with the integration circuit arrangement such that the proximity indicator repeatedly initiates and ends the integration of the output of the transducer over a time period which the fibre sliver requires for covering the path corresponding to the length of a predetermined measuring length (s).
  • the integrating circuit arrangement additionally can be designed as a sample and hold circuit arrangement with a holding condenser.
  • the approach indicator can be designed in such manner that at each passage of a tooth of the gear an impulse is transmitted to the control logic device, which for opening and closing two switches can be designed in such manner that between a first and a second impulse an integration value is formed at the collecting condenser, and that between the second and third impulse is held at the holding condenser.
  • the integrating circuit arrangement is provided with an output circuit connected to the holding condenser for an output signal which, e.g. can be used for controlling a gear arrangement of the spinning preparatory machine.
  • a fibre sliver 1 For measuring the linear density of a fibre sliver 1 (Fig. 1) the fibre sliver is transported at operating speed through a measuring funnel 2. At its point of reduction of the cross-section area a pneumatic duct 3 merges into the funnel 2, using which the pressure in the measuring funnel 2 is measured in the known manner, which pressure is a measure of the linear density of the fibre sliver 1.
  • the pneumatic measuring signal is transmitted via the duct 3 to a pneumatic/electric transducer 4, by which the pressure measured by a pressure measuring device is transformed into a proportional voltage signal.
  • the voltage signal is transmitted via the circuit 5 to an integrating circuit arrangement 6, in which the voltage is integrated.
  • an integration end value of the voltage is formed over a time period, which the fibre sliver requires for covering a distance chosen as a constant measuring length s.
  • the integration value corresponding to an output signal 7 is held in storage until it is cancelled as the next integration value arrives.
  • the output signal 7 thus forms a measure for the linear density (titre) of a constant length of the fibre sliver, which measure is well suited for the control purposes or by suitable transformation can be transduced into a normal measure value of linear density.
  • Fig. 2 the course of the voltage U (p) depending on the pneumatic pressure is plotted (towards the right hand side) against the length 1 covered by the fibre sliver (extending upward in the diagram).
  • the integration value ⁇ (p) corresponding to the output signal 7 forms a step line, the step width s of which corresponds to the measuring length of the fibre sliver.
  • the integration value U (p) thus forms the mean value of the voltage U (p) over the integration interval, and coincides the closer with the momentaneous voltage course, the shorter the measuring length s corresponding to the path covered by the fibre sliver is chosen.
  • the output signal 7 forming a measure of the linear density of the fibre sliver thus is entirely independent of the fibre sliver speed, as the integration value is formed always over the same constant length of sliver.
  • the integration time and the pressure p change in opposite senses, if the fibre sliver speed changes just as the fibre sliver covers the path corresponding to the measuring length s faster or slower.
  • a fibre sliver 1 is transported through a measuring funnel 2 before reaching a pair of rolls 8 of a spinning preparatory machine not shown in more detail.
  • the increasing funnel 2 via a pneumatic duct 3 is connected with a pneumatic/electric transducer 4.
  • a circuit 5 conveys the signal into an integrating circuit 6 which is lead out as an integration and sample-and-hold circuit and which yields an output signal 7.
  • a motor 9 drives a gear arrangement 10 of the spinning preparatory machine, the drive of the pair of rolls 8 only being shown in the figure.
  • Facing a gear 11 of the gear arrangement 10 a proximity indicator 12 is arranged, which electrically is connected with a control logic device 13.
  • the control logic device 13 is connected with two switches 14 and 15 and with the integrating circuit 6.
  • the pneumatic pressure measure in the measuring funnel 2 is transformed in the transducer 4 into a proportional voltage and is transmitted to into the integrating circuit 6 designed as an integrating and sample-and-hold circuit.
  • the proximity indicator 12 now scans, e.g. the distance t of two neighbouring teeth of the gear 11, i.e. each time a tooth passes it, an impulse is transmitted to the control logic device 13.
  • the gear tooth gauge t is constant from tooth to tooth and corresponds to a small length s of the sliver 1 being transported by the rolls 8, and thus corresponds to a constant measuring length s.
  • the control logic 13 opens and closes the switches in such rhythm that continuously the voltage values are integrated on the collector condenser 16 between a first and a second impulse produced by the proximity indicator 12, then are transferred to the hold condenser 17 where they are stored between the second and a third impulse, and subsequently are cancelled as the next following integration value arrives.
  • a circuit connected with the hold condenser now continuously yields, with each rotational movement of the gear 11 over the gear tooth gauge t, an integrated voltage value which is proportional to the linear density of the measuring length s of the fibre sliver 1, or respectively of the fibre sliver length transported by this rotational movement of the gear 11.
  • the output signal 7 now forms a suitable control value for spinning preparation, which is independent of the processing speed of the fibre sliver.
  • the signal 7 can be transmitted, for controlling the speed of the motor 9, into a control arrangement 18 connected to the motor 9, as shown in Fig. 3 with broken lines. In such manner the speed of the gear arrangement 10 and of the pair of rolls 8 connected therewith can be controlled in function of the linear density of the fibre sliver 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP78900227A 1977-12-22 1979-07-16 Method and apparatus for producing measuring values corresponding to the linear density of fibre slivers Expired EP0007374B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1586677A CH629546A5 (de) 1977-12-22 1977-12-22 Verfahren zur bestimmung des titers von in der spinnereivorbereitung anfallenden faserbaendern und vorrichtung zur durchfuehrung des verfahrens.
CH15866/77 1977-12-22

Publications (2)

Publication Number Publication Date
EP0007374A1 EP0007374A1 (en) 1980-02-06
EP0007374B1 true EP0007374B1 (en) 1983-10-26

Family

ID=4412629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78900227A Expired EP0007374B1 (en) 1977-12-22 1979-07-16 Method and apparatus for producing measuring values corresponding to the linear density of fibre slivers

Country Status (10)

Country Link
EP (1) EP0007374B1 (es)
JP (1) JPS55500021A (es)
AR (1) AR225607A1 (es)
BE (1) BE873050A (es)
CH (1) CH629546A5 (es)
ES (1) ES476695A1 (es)
GB (1) GB2036102B (es)
IT (1) IT1100258B (es)
NL (1) NL7810843A (es)
WO (1) WO1979000420A1 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2182904A (en) * 1985-11-18 1987-05-28 British Nuclear Fuels Plc A positioning mechanism
US5093025A (en) * 1989-04-07 1992-03-03 Tosoh Corporation Cholesteric liquid crystal polyester containing optically active group
JPH03180519A (ja) * 1989-12-04 1991-08-06 Mas Fab Rieter Ag スライバにおける繊度及びその変動の連続的検出方法及びこの方法を実施する装置
US5289381A (en) * 1989-12-04 1994-02-22 Maschinenfabrik Rieter Ag Method and apparatus for continuously determining the fineness of fibers in slivers
DE4414972C2 (de) * 1994-04-29 2003-07-24 Rieter Ingolstadt Spinnerei Korrektur eines von einem Tastwalzenpaar zur Dicke eines textilen Faserbandes gewonnenen Meßsignals
DE19921429B4 (de) * 1998-06-29 2017-03-02 Rieter Ingolstadt Gmbh Verfahren und Vorrichtung zur Fehlerkorrektur eines von einem Meßorgan gelieferten Meßwertes von Faserband in einer Textilmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2682144A (en) * 1947-03-18 1954-06-29 Deering Milliken Res Trust Control method and means
US2843882A (en) * 1955-06-08 1958-07-22 Us Rubber Co Evener
DE1167709B (de) * 1962-02-05 1964-04-09 Walther Wegener Dr Ing Verfahren und Vorrichtung zum selbsttaetigen Vergleichmaessigen von Faserbaendern, Faservliesen u. dgl. beim Verstrecken
US3154810A (en) * 1962-12-31 1964-11-03 Monsanto Co Denier monitoring and control system
FR1408755A (fr) * 1964-06-22 1965-08-20 Inst Regelungstechnik Groupe d'étirage de commande pour bancs d'étirage de peignés, notamment pour les bancs d'étirage de peignés à curseur rapide
DE1912329A1 (de) * 1968-03-11 1969-10-09 Teijin Ltd Vorrichtung fuer Deniermessung von Garn

Also Published As

Publication number Publication date
EP0007374A1 (en) 1980-02-06
JPS55500021A (es) 1980-01-24
GB2036102A (en) 1980-06-25
AR225607A1 (es) 1982-04-15
ES476695A1 (es) 1979-11-16
IT7829707A0 (it) 1978-11-13
WO1979000420A1 (fr) 1979-07-12
IT1100258B (it) 1985-09-28
NL7810843A (nl) 1979-06-26
GB2036102B (en) 1982-11-03
CH629546A5 (de) 1982-04-30
BE873050A (fr) 1979-06-22

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