EP0007373A1 - 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.

Info

Publication number
EP0007373A1
EP0007373A1 EP78900223A EP78900223A EP0007373A1 EP 0007373 A1 EP0007373 A1 EP 0007373A1 EP 78900223 A EP78900223 A EP 78900223A EP 78900223 A EP78900223 A EP 78900223A EP 0007373 A1 EP0007373 A1 EP 0007373A1
Authority
EP
European Patent Office
Prior art keywords
measuring
section area
duct
fiber
throughput
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
EP78900223A
Other languages
German (de)
French (fr)
Other versions
EP0007373B1 (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 EP0007373A1 publication Critical patent/EP0007373A1/en
Application granted granted Critical
Publication of EP0007373B1 publication Critical patent/EP0007373B1/en
Expired legal-status Critical Current

Links

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 an apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation, with a pneumatic throughput measuring duct tapering off as seen in the direction of move ent of the fiber sliver.
  • 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 anometer is connected.
  • the pressure measured by the manometer forms a measuring value corresponding to the material cross-section area of the fiber 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 fiber sliver, but also depends on the fiber sliver throughput speed, the fiber shape and the fiber fineness and thus yields a biased measure of the material cross-section area of the fiber sliver.
  • an apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation with a pneumatic throughput measuring duct converging as seen in the direction of movement of the fiber sliver, characterized in that two pneumatic pressure measuring ducts are connected on one hand to two measuring points at which the duct is of different cross-section area and are connected on the other hand to a division circuit arrangement.
  • Fig. 1 an apparatus provided with a step-funnel as a throu put measuring duct, and in
  • FIG. 2 for suitable funnel shapes of the throughput and 3 measuring duct applicable in the apparatus accordin to Fig. 1.
  • a fiber sliver 1 for measuring is transported through a funnel which in principle consists of two combined step-funnels, one of the funnels being of the lengths 1 .., 1 and of the cross-section areas A, A_ and the other funnel being of the length 1, 1 and of the cross-section areas A_, A-, the and the cross-section area A_ thus being com on to both
  • 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 instru- ment 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 proportio- nal 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 current titer (or linear density) of the fiber 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 fiber sliver 1.
  • This measuring value now is not influenced by the throughput speed of the fiber sliver nor by the fiber shape, nor by the fiber fineness, and thus is suitable for Controlling purposes, or easily can be trans-formed by suitable transformation into a measure normally used for the material cross-section of the fiber sliver.
  • inventive apparatus is not limited to the step-funnel according to Fig. 1, as the eli ination of the biasing influences owing to the quotient formation does not depend on the funnel shape.
  • 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, abrup changes in cross-section area, in such manner that the positi of the fibers in the fiber array remains as undisturbed as possible. It also is possible to provide the throughput measu ring duct in two separate funnels arranged consecutivel, eac 100 funnel being provided with a measuring point.
  • funnels 2 of 105 suitable cross-section shape are shown, one of the funnels comprising a conical fiber • throughput duct section between two cylindrical sections, and the other funnel comprising a curved convergence of the fiber throughput duct.

Landscapes

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

Abstract

L'appareil permet d'etablir des valeurs de mesure, des valeurs de mesure de l'accroissement correspondant a la section des meches de fibres de preparation. On utilise une conduite de debit convergente, placee dans le sens de transport de la meche de fibres, dans laquelle arrivent deux tubes de mesures a pression (5 et 6) en deux points de mesure (3 et 4) ou le diametre de la conduite est different. Les deux tubes de mesure transmettent des signaux de mesure qui sont ensuite traites par un dispositif de circuit (11) qui produit un signal de sortie (12). Le signal de sortie est utilise pour controler ou mesurer les meches de fibres sur des machines de traitement de meches de fibres ou sur des machines a filer traitant ces meches de fibres.The apparatus makes it possible to establish measurement values, measurement values of the increase corresponding to the section of the preparation fiber strands. A converging flow pipe is used, placed in the direction of transport of the fiber strand, in which two pressure measuring tubes (5 and 6) arrive at two measuring points (3 and 4) or the diameter of the pipe. is different. The two measuring tubes transmit measuring signals which are then processed by a circuit device (11) which produces an output signal (12). The output signal is used to monitor or measure strands of fibers on machines for processing strands of fibers or on spinning machines processing such strands of fibers.

Description

Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers processed in spinning preparationApparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation
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 pneumatic throughput measuring duct tapering off as seen in the direction of move ent of the fibre sliver.The present invention concerns an apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation, with a pneumatic throughput measuring duct tapering off as seen in the direction of move ent of the fiber sliver.
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 anometer is connected. The pressure measured by the manometer forms a measuring value 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.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 anometer is connected. The pressure measured by the manometer forms a measuring value corresponding to the material cross-section area of the fiber 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 fiber sliver, but also depends on the fiber sliver throughput speed, the fiber shape and the fiber fineness and thus yields a biased measure of the material cross-section area of the fiber 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 pneumatic throughput measuring duct converging as seen in the direction of movement of the fibre sliver, characterised in that two pneumatic pressure measuring ducts are connected on one hand to two measuring points at which the duct is of different cross-section area and are connected on the other hand to a division circuit arrangement.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 fiber sliver. This objective is achieved by an apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation, with a pneumatic throughput measuring duct converging as seen in the direction of movement of the fiber sliver, characterized in that two pneumatic pressure measuring ducts are connected on one hand to two measuring points at which the duct is of different cross-section area and are connected on the other hand to a division circuit arrangement.
The invention is described in more detail in the following with reference to illustrated design examples of the inventiv apparatus. It is shown in:The invention is described in more detail in the following with reference to illustrated design examples of the inventiv apparatus. It is shown in:
Fig. 1 an apparatus provided with a step-funnel as a throu put measuring duct, and inFig. 1 an apparatus provided with a step-funnel as a throu put measuring duct, and in
Figs. 2 f rther suitable funnel shapes of the throughput and 3 measuring duct applicable in the apparatus accordin to Fig. 1.Figs. 2 for suitable funnel shapes of the throughput and 3 measuring duct applicable in the apparatus accordin to Fig. 1.
Surprisingly, it was found that, if a fibre sliver is trans¬ ported through two pneumatic measuring ducts, the pressure in each duct is measured, and the two measuring Signals are di- vided, 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.Surprisingly, it was found that, if a fiber 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 fiber sliver results, which is independent of the throughput speed of the fiber sliver, of the fiber shape and of the fiber fineness.
The apparatus shown in Fig. 1 makes use of these findings. A fibre sliver 1 for measuring is transported through a funnel which in principle consists of two combined step-funnels, one of the funnels being of the lengths 1.. , 1 and of the cross- section areas A , A_ and the other funnel being of the length 1 , 1 and of the cross-section areas A_, A-, the and the cross-section area A_ thus being com on to bothThe apparatus shown in Fig. 1 makes use of these findings. A fiber sliver 1 for measuring is transported through a funnel which in principle consists of two combined step-funnels, one of the funnels being of the lengths 1 .., 1 and of the cross-section areas A, A_ and the other funnel being of the length 1, 1 and of the cross-section areas A_, A-, the and the cross-section area A_ thus being com on to both
2 funnels.2 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 instru- ent is transforπted into a proportional voltage. The trans¬ ducers 7 and 8 via electrical circuits 9 and 10 are connected with an electronic division circuit device 11 which yields an Output signal 12.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 instru- ment 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 proportio- nal 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 mo- entaneous 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 trans- formed by suitable transformation into a measure normally used for the material cross-section of the fibre sliver.The pneumatic pressure p scanned at the measuring points 3 and 4 is transformed by the transducers 7 and 8 into proportio- nal 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 current titer (or linear density) of the fiber 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 fiber sliver 1. This measuring value now is not influenced by the throughput speed of the fiber sliver nor by the fiber shape, nor by the fiber fineness, and thus is suitable for Controlling purposes, or easily can be trans-formed by suitable transformation into a measure normally used for the material cross-section of the fiber sliver.
Application of the inventive apparatus described above is not limited to the step-funnel according to Fig. 1, as the eli ination of the biasing influences owing to the quotient formation does not depend on the funnel shape. As a through¬ put 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.Application of the inventive apparatus described above is not limited to the step-funnel according to Fig. 1, as the eli ination of the biasing influences owing to the quotient formation does not depend on the funnel shape. As a through put put for the fiber 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.
95 Advantageous funnel shapes do not contain, if possible, abrup changes in cross-section area, in such manner that the positi of the fibres in the fibre array remains as undisturbed as possible. It also is possible to provide the throughput measu ring duct in two separate funnels arranged consecutivel , eac 100 funnel being provided with a measuring point. 95 Advantageous funnel shapes do not contain, if possible, abrup changes in cross-section area, in such manner that the positi of the fibers in the fiber array remains as undisturbed as possible. It also is possible to provide the throughput measu ring duct in two separate funnels arranged consecutivel, eac 100 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 105 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.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 105 suitable cross-section shape are shown, one of the funnels comprising a conical fiber • throughput duct section between two cylindrical sections, and the other funnel comprising a curved convergence of the fiber throughput duct.
OΛ. OΛ.

Claims

Claims : Claims:
1. Apparatus for establishing measuring values corresponding to the material cross-section area of fibre slivers pro- cessed in spinning preparation, with a pneumatic through¬ put measuring duct converging as seen in the direction of movement of the fibre sliver, characterised in that two pneumatic pressure measuring ducts (5,6) are connected on one hand to two measuring points (3,4) at which the duct is of different cross-section area and on the other hand are connected to a division circuit arrange ent (11) .1. Apparatus for establishing measuring values corresponding to the material cross-section area of fiber slivers processed in spinning preparation, with a pneumatic through-put measuring duct converging as seen in the direction of movement of the fiber sliver, characterized in that two pneumatic pressure measuring ducts (5,6) are connected on one hand to two measuring points (3,4) at which the duct is of different cross-section area and on the other hand are connected to a division circuit arrange ent (11) .
2. Apparatus according to claim 1, characterised in that the pressure measuring ducts (5,6) are connected via two pneumatic/electric transducers (7,8) with an electro¬ nic division circuit arrangement (11) .2. Apparatus according to claim 1, characterized in that the pressure measuring 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 throughput measuring duct is part of a hollow body (2) .3.. Apparatus according to claim 1, characterized in that the throughput measuring duct is part of a hollow body (2).
4. Apparatus according to claim 1, characterised in that the throughput measuring duct is part of two consecutively arranged hollow bodies.4. Apparatus according to claim 1, characterized in that the throughput measuring duct is part of two consecutively arranged hollow bodies.
5. Apparatus according to claim 3, characterised in that the throughput measuring duct contains a conical section bet- ween two cylindrical sections.5. Apparatus according to claim 3, characterized in that the throughput measuring duct contains a conical section between two cylindrical sections.
6. , Apparatus according to claim 3, characterised in that the throughput measuring duct cross-section area decreases continuously. 6. , Apparatus according to claim 3, characterized in that the throughput measuring duct cross-section area 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
CH15865/77 1977-12-22
CH1586577A CH624759A5 (en) 1977-12-22 1977-12-22

Publications (2)

Publication Number Publication Date
EP0007373A1 true EP0007373A1 (en) 1980-02-06
EP0007373B1 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5630251A (en) * 1995-08-03 1997-05-20 Tr utzschler GmbH & Co. KG Sliver guide assembly including a sliver guiding device and a sliver preformer
ITUB20154753A1 (en) * 2015-10-30 2017-04-30 Mesdan Spa MEASUREMENT DEVICE FOR MEASURING FINE AND MATURITY? OF COTTON FIBER.

Families Citing this family (3)

* 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

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO7900419A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5630251A (en) * 1995-08-03 1997-05-20 Tr utzschler GmbH & Co. KG Sliver guide assembly including a sliver guiding device and a sliver preformer
ITUB20154753A1 (en) * 2015-10-30 2017-04-30 Mesdan Spa MEASUREMENT DEVICE FOR MEASURING FINE AND MATURITY? OF COTTON FIBER.
US10024839B2 (en) 2015-10-30 2018-07-17 Mesdan S.P.A. Measuring device for measuring the fineness and maturity of cotton fibers

Also Published As

Publication number Publication date
ES476694A1 (en) 1979-11-16
ATA748478A (en) 1985-04-15
JPS55500020A (en) 1980-01-24
DE2857279C2 (en) 1986-02-06
NL7810847A (en) 1979-06-26
WO1979000419A1 (en) 1979-07-12
AT379241B (en) 1985-12-10
BE873049A (en) 1979-06-22
AR216966A1 (en) 1980-02-15
EP0007373B1 (en) 1983-03-23
CH624759A5 (en) 1981-08-14
IT1099431B (en) 1985-09-18
DE2857279T1 (en) 1980-12-04
IT7829047A0 (en) 1978-10-24

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