EP0007373A1 - Apparat zum erstellen von messwerten, korrespondierend mit dem materialquerschnitt von fasersträhnen in der spinnvorbereitung. - Google Patents

Apparat zum erstellen von messwerten, korrespondierend mit dem materialquerschnitt von fasersträhnen in der spinnvorbereitung.

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
English (en)
French (fr)
Other versions
EP0007373B1 (de
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/de
Application granted granted Critical
Publication of EP0007373B1 publication Critical patent/EP0007373B1/de
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)

Description

Apparatus for establishing measuring values corresponding to the material cross-section area of fibre 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.
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.
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.
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 in
Figs. 2 f rther 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.
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 both
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.
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.
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.
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.
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.
OΛ.

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) .
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) .
3. . Apparatus according to claim 1, characterised 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.
5. Apparatus according to claim 3, characterised in that the throughput measuring duct contains a conical section bet- ween two cylindrical sections.
6. , Apparatus according to claim 3, characterised in that the throughput measuring duct cross-section area decreases continuously.
EP78900223A 1977-12-22 1979-07-16 Apparat zum erstellen von messwerten, korrespondierend mit dem materialquerschnitt von fasersträhnen in der spinnvorbereitung Expired EP0007373B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=4412618

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78900223A Expired EP0007373B1 (de) 1977-12-22 1979-07-16 Apparat zum erstellen von messwerten, korrespondierend mit dem materialquerschnitt von fasersträhnen in der spinnvorbereitung

Country Status (11)

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

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 (it) * 2015-10-30 2017-04-30 Mesdan Spa Dispositivo di misurazione per la misurazione della finezza e della maturita? di fibre di cotone.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3244619C2 (de) * 1982-04-01 1994-07-07 Truetzschler Gmbh & Co Kg Vorrichtung zur Regelung einer aus mehreren Teilbereichen bestehenden Spinnereivorbereitungsanlage
DE3834110A1 (de) * 1988-10-07 1990-04-12 Truetzschler & Co Verfahren und vorrichtung zur bewegungserfassung von textilfaserbaendern, z. b. kardenbaendern
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 (de) * 1966-05-06 1967-05-31 Zellweger Uster Ag Verfahren und Vorrichtung zur Gewinnung von Messwerten, die dem Substanzquerschnitt von Textilmaterial, insbesondere von Faserbändern, entsprechen
CH488996A (de) * 1968-12-02 1970-04-15 Honegger & Co Vorm Emil Honegg Messelement zur kontinuierlichen Überwachung der Mächtigkeit eines Faserstoffstranges

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 (it) * 2015-10-30 2017-04-30 Mesdan Spa Dispositivo di misurazione per la misurazione della finezza e della maturita? di fibre di cotone.
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
AT379241B (de) 1985-12-10
NL7810847A (nl) 1979-06-26
DE2857279T1 (de) 1980-12-04
ATA748478A (de) 1985-04-15
BE873049A (fr) 1979-06-22
ES476694A1 (es) 1979-11-16
AR216966A1 (es) 1980-02-15
JPS55500020A (de) 1980-01-24
WO1979000419A1 (en) 1979-07-12
IT1099431B (it) 1985-09-18
EP0007373B1 (de) 1983-03-23
CH624759A5 (de) 1981-08-14
DE2857279C2 (de) 1986-02-06
IT7829047A0 (it) 1978-10-24

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