EP0007373B1 - Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation - Google Patents

Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation Download PDF

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Publication number
EP0007373B1
EP0007373B1 EP78900223A EP78900223A EP0007373B1 EP 0007373 B1 EP0007373 B1 EP 0007373B1 EP 78900223 A EP78900223 A EP 78900223A EP 78900223 A EP78900223 A EP 78900223A EP 0007373 B1 EP0007373 B1 EP 0007373B1
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EP
European Patent Office
Prior art keywords
measuring
section
fibre
cross
section area
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Expired
Application number
EP78900223A
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German (de)
French (fr)
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EP0007373A1 (en
Inventor
Robert Moser
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Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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    • 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 an apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation, with a funnel section having a converging cross-section as seen in the direction of travel of a fibre sliver passing therethrough.
  • the throughput measuring duct between consecutively arranged planes extending at right angles with respect to the duct axis contains a hollow room, to which a manometer is connected.
  • the pressure measured by the manometer forms a measuring valve corresponding to the material cross-section area of the fibre sliver transported through the duct.
  • the device described shows the serious disadvantage that the measuring value does not solely depend on the material cross-section area of the fibre sliver, but also depends on the fibre sliver throughput speed, the fibre shape and the fibre fineness and thus yields a biased measure of the material cross-section area of the fibre sliver.
  • an apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation with a funnel section having a converging cross-section as seen in the direction of travel of a fibre sliver passing therethrough, characterised in that two pneumatic pressure tapping ducts are connected on one hand to two measuring points at which the funnel section is of different cross-section area and are connected on the other hand to a division circuit arrangement to receive and divide one measured pressure into the other to obtain an output signal corresponding thereto, said output signal forming a measuring value of the material cross-sectional area of the travelling fibre sliver.
  • a fibre sliver 1 for measuring is transported through a funnel 2 which in principle consists of two combined step-funnels, one of the funnels being of the lengths, 1 1 , 1 2 and of the cross-section areas A 1' A 2 and the other funnel being of the lengths 1 2 , 1 3 and of the cross-section areas A 2 , A3, the length 1 2 and the cross-section area A 2 thus being common to both funnels.
  • two measuring points 3 and 4 for measuring the pressure are provided, each being connected via the pneumatic ducts 5 and 6 respectively, with pneumatic-electric transducers 7 and 8 by which the pressure measured by a pressure measuring instrument is transformed into a proportional voltage.
  • the transducers 7 and 8 via electrical circuits 9 and 10 are connected with an electronic division circuit device 11 which yields an output signal 12.
  • the pneumatic pressure p scanned at the measuring points 3 and 4 is transformed by the transducers 7 and 8 into proportional voltage U. Both voltages subsequently are transmitted to the division circuit device 11 where their quotient is formed.
  • the output signal 12 is a voltage U(t) depending on the momentaneous titer (or linear density) of the fibre sliver, which is proportional to the quotient of the two pressures p and thus forms a measuring value of the material cross-section area of the fibre sliver 1.
  • This measuring value now is not influenced by the throughput speed of the fibre sliver nor by the fibre shape, nor by the fibre fineness, and thus is suitable for controlling purposes, or easily can be transformed by suitable transformation into a measure normally used for the material cross-section of the fibre sliver.
  • Advantageous funnel shapes do not contain, if possible, abrupt changes in cross-section area, in such manner that the position of the fibres in the fibre array remains as undisturbed as possible. It also it possible to provide the throughput measuring duct in two separate funnels arranged consecutively, each funnel being provided with a measuring point.
  • funnels 2 of suitable cross-section shape are shown, one of the funnels comprising a conical fibre throughput duct section between two cylindrical sections, and the other funnel comprising a curved convergence of the fibre throughput duct.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

The apparatus permits establishment of measuring values, yielding measuring values being representative of the material cross-section area solely of fibre slivers. A throughput duct converging, as seen in the direction of transport of the fibre sliver, is used into which two pressure measuring ducts (5 and 6) merge at two measuring points (3 and 4) at which the duct diameter is different. The two measuring ducts transmit measuring signals which are further processed in a division circuit arrangement (11), which yields an output signal (12). The output signal is used for fibre sliver control or measuring purposes on machines processing fibre slivers or on spinning machines processing such fibre slivers further.

Description

  • The present invention concerns an apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation, with a funnel section having a converging cross-section as seen in the direction of travel of a fibre sliver passing therethrough.
  • In a device of the above mentioned type (Swiss Patent No. 436.779) the throughput measuring duct between consecutively arranged planes extending at right angles with respect to the duct axis contains a hollow room, to which a manometer is connected. The pressure measured by the manometer forms a measuring valve corresponding to the material cross-section area of the fibre sliver transported through the duct. The device described, however, shows the serious disadvantage that the measuring value does not solely depend on the material cross-section area of the fibre sliver, but also depends on the fibre sliver throughput speed, the fibre shape and the fibre fineness and thus yields a biased measure of the material cross-section area of the fibre sliver.
  • It thus is the objective of the present invention to avoid this disadvantage and to create an apparatus yielding measuring values depending solely on the material cross-section area of the fibre sliver.
  • This objective is achieved by an apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation, with a funnel section having a converging cross-section as seen in the direction of travel of a fibre sliver passing therethrough, characterised in that two pneumatic pressure tapping ducts are connected on one hand to two measuring points at which the funnel section is of different cross-section area and are connected on the other hand to a division circuit arrangement to receive and divide one measured pressure into the other to obtain an output signal corresponding thereto, said output signal forming a measuring value of the material cross-sectional area of the travelling fibre sliver.
  • The invention is described in more detail in the following with reference to illustrated design examples of the inventive apparatus. It is shown in:
    • Fig. 1 an apparatus provided with a step-funnel as a throughput measuring duct, and in
    • Figs. 2 and 3 further suitable funnel shapes of the throughput measuring duct applicable in the apparatus according to Fig. 1.
  • Surprisingly, it was found that, if a fibre sliver is transported through two pneumatic measuring ducts, the pressure in each duct is measured, and the two measuring signals are divided, a signal corresponding to the material cross-section area of the fibre sliver results, which is independent of the throughput speed of the fibre sliver, of the fibre shape and of the fibre fineness.
  • The apparatus shown in Fig. 1 makes use of these findings. A fibre sliver 1 for measuring is transported through a funnel 2 which in principle consists of two combined step-funnels, one of the funnels being of the lengths, 11, 12 and of the cross-section areas A1' A2 and the other funnel being of the lengths 12, 13 and of the cross-section areas A2, A3, the length 12 and the cross-section area A2 thus being common to both funnels.
  • At each narrowing point between the straight funnel sections two measuring points 3 and 4 for measuring the pressure are provided, each being connected via the pneumatic ducts 5 and 6 respectively, with pneumatic-electric transducers 7 and 8 by which the pressure measured by a pressure measuring instrument is transformed into a proportional voltage. The transducers 7 and 8 via electrical circuits 9 and 10 are connected with an electronic division circuit device 11 which yields an output signal 12.
  • The pneumatic pressure p scanned at the measuring points 3 and 4 is transformed by the transducers 7 and 8 into proportional voltage U. Both voltages subsequently are transmitted to the division circuit device 11 where their quotient is formed. The output signal 12 is a voltage U(t) depending on the momentaneous titer (or linear density) of the fibre sliver, which is proportional to the quotient of the two pressures p and thus forms a measuring value of the material cross-section area of the fibre sliver 1. This measuring value now is not influenced by the throughput speed of the fibre sliver nor by the fibre shape, nor by the fibre fineness, and thus is suitable for controlling purposes, or easily can be transformed by suitable transformation into a measure normally used for the material cross-section of the fibre sliver.
  • Application of the inventive apparatus described above is not limited to the step-funnel according to Fig. 1, as the elimination of the biasing influences owing the quotient formation does not depend on the funnel shape. As a throughput duct for the fibre sliver thus a converging funnel of any desired shape can be used, into which the two measuring ducts 5 and 6 merge at points of differing duct cross-section area.
  • Advantageous funnel shapes do not contain, if possible, abrupt changes in cross-section area, in such manner that the position of the fibres in the fibre array remains as undisturbed as possible. It also it possible to provide the throughput measuring duct in two separate funnels arranged consecutively, each funnel being provided with a measuring point.
  • Furthermore, it proves advantageous to connect the measuring ducts 5 and 6 at locations in the funnel which differ widely in duct cross-section area. In Figs. 2 and 3 funnels 2 of suitable cross-section shape are shown, one of the funnels comprising a conical fibre throughput duct section between two cylindrical sections, and the other funnel comprising a curved convergence of the fibre throughput duct.

Claims (6)

1. Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation, with a funnel section having a converging cross-section in the direction of travel of a fibre sliver passing therethrough, characterised in that two pneumatic pressure tapping ducts (5, 6) are connected on one hand to two measuring points (3, 4) at which the funnel section is of different cross-section area and on the other hand are connected to a division circuit arrangement (11) to receive and divide one measured pressure into the other to obtain an output signal corresponding thereto, said output signal forming a measuring value of the material cross-sectional area of the travelling fibre sliver.
2. Apparatus according to claim 1, characterised in that the pressure tapping ducts (5, 6) are connected via two pneumatic/electric transducers (7, 8) with an electronic division circuit arrangement (11).
3. Apparatus according to claim 1, characterised in that the funnel section is part of a hollow body (2).
4. Apparatus according to claim 1, characterised in that the funnel section is part of two consecutively arranged hollow bodies.
5. Apparatus according to claim 3, characterised in that the funnel section contains a conical section between two cylindrical sections.
6. Apparatus according to claim 3, characterised in that the cross-section area of the funnel section decreases continuously.
EP78900223A 1977-12-22 1979-07-16 Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation Expired EP0007373B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1586577A CH624759A5 (en) 1977-12-22 1977-12-22
CH15865/77 1977-12-22

Publications (2)

Publication Number Publication Date
EP0007373A1 EP0007373A1 (en) 1980-02-06
EP0007373B1 true EP0007373B1 (en) 1983-03-23

Family

ID=4412618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78900223A Expired EP0007373B1 (en) 1977-12-22 1979-07-16 Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparation

Country Status (11)

Country Link
EP (1) EP0007373B1 (en)
JP (1) JPS55500020A (en)
AR (1) AR216966A1 (en)
AT (1) AT379241B (en)
BE (1) BE873049A (en)
CH (1) CH624759A5 (en)
DE (1) DE2857279C2 (en)
ES (1) ES476694A1 (en)
IT (1) IT1099431B (en)
NL (1) NL7810847A (en)
WO (1) WO1979000419A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528484A1 (en) * 1995-08-03 1997-02-06 Truetzschler Gmbh & Co Kg Device on a line for measuring the thickness of a fiber structure

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244619C2 (en) * 1982-04-01 1994-07-07 Truetzschler Gmbh & Co Kg Device for controlling a spinning preparation plant consisting of several sections
DE3834110A1 (en) * 1988-10-07 1990-04-12 Truetzschler & Co METHOD AND DEVICE FOR DETECTING THE MOVEMENT OF TEXTILE FIBER TAPES, e.g. CARD TAPES
US6516551B2 (en) * 2000-12-27 2003-02-11 American Technologies Network Corporation Optical sight with switchable reticle
ITUB20154753A1 (en) * 2015-10-30 2017-04-30 Mesdan Spa MEASUREMENT DEVICE FOR MEASURING FINE AND MATURITY? OF COTTON FIBER.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465818A (en) * 1943-06-26 1949-03-29 Gen Electric Device for measuring fiber density of a sliver
CH436779A (en) * 1966-05-06 1967-05-31 Zellweger Uster Ag Method and device for obtaining measured values which correspond to the substance cross-section of textile material, in particular of fiber ribbons
CH488996A (en) * 1968-12-02 1970-04-15 Honegger & Co Vorm Emil Honegg Measuring element for continuous monitoring of the thickness of a fiber strand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528484A1 (en) * 1995-08-03 1997-02-06 Truetzschler Gmbh & Co Kg Device on a line for measuring the thickness of a fiber structure

Also Published As

Publication number Publication date
IT7829047A0 (en) 1978-10-24
IT1099431B (en) 1985-09-18
BE873049A (en) 1979-06-22
AR216966A1 (en) 1980-02-15
JPS55500020A (en) 1980-01-24
ES476694A1 (en) 1979-11-16
EP0007373A1 (en) 1980-02-06
AT379241B (en) 1985-12-10
DE2857279T1 (en) 1980-12-04
DE2857279C2 (en) 1986-02-06
ATA748478A (en) 1985-04-15
NL7810847A (en) 1979-06-26
WO1979000419A1 (en) 1979-07-12
CH624759A5 (en) 1981-08-14

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