EP0708849B1 - Kardier-verzug regelanordnung - Google Patents

Kardier-verzug regelanordnung Download PDF

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Publication number
EP0708849B1
EP0708849B1 EP94920560A EP94920560A EP0708849B1 EP 0708849 B1 EP0708849 B1 EP 0708849B1 EP 94920560 A EP94920560 A EP 94920560A EP 94920560 A EP94920560 A EP 94920560A EP 0708849 B1 EP0708849 B1 EP 0708849B1
Authority
EP
European Patent Office
Prior art keywords
rollers
drafting
sliver
measuring
drive means
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
EP94920560A
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English (en)
French (fr)
Other versions
EP0708849A1 (de
Inventor
John Crosrol Limited Varga
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.)
Carding Specialists Canada Ltd
Original Assignee
Carding Specialists Canada Ltd
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Filing date
Publication date
Application filed by Carding Specialists Canada Ltd filed Critical Carding Specialists Canada Ltd
Publication of EP0708849A1 publication Critical patent/EP0708849A1/de
Application granted granted Critical
Publication of EP0708849B1 publication Critical patent/EP0708849B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D01G15/00—Carding machines or accessories; Card clothing; Burr-crushing or removing arrangements associated with carding or other preliminary-treatment machines
    • D01G15/02—Carding machines
    • D01G15/12—Details
    • D01G15/46—Doffing or like arrangements for removing fibres from carding elements; Web-dividing apparatus; Condensers
    • D01G15/64—Drafting or twisting apparatus associated with doffing arrangements or with web-dividing apparatus

Definitions

  • This invention relates to a carding / drafting leveller system for controlling the production of sliver.
  • TG rollers tongue and groove
  • On of the measuring rollers is usually mounted in such a way as to allow its axis of rotation to move radially relative to the other roller in response to variation in sliver thickness of the sliver passing between the rollers, and this movement is monitored and provides, where necessary, feedback to vary the speed of the feed roller.
  • the sliver issuing from the measuring rollers then usually passes to a coiler. Other times it passes to a drafting system, comprising drafting rollers whose relative speed of rotation is set to provide a required "drafting ratio", which might typically be of the order of 1.3:1.
  • EP-A-0354653 It is known from EP-A-0354653 to provide an apparatus for controlling the formation of a sliver and which comprises:
  • the invention seeks to achieve this object by the features of the sliver formation apparatus defined below.
  • the present invention provides apparatus for controlling the formation of a sliver and comprising:
  • the invention provides sliver formation apparatus in which there is automatic control over the feeding supply to the card as a result of downstream monitoring of the sliver by the measuring rollers (so-called closed loop levelling), and in addition the transmission of drive to the drafting rollers at a predetermined drafting ratio is subject to two-part feed-forward control, one part of which is responsive to sliver deviation monitoring by the measuring rollers and the other part of which is responsive to relative peripheral distance monitoring by said monitoring device.
  • the feedback control (to the feeding device) may take any suitable mechanical or electromechanical form, of a type known per se in "autolevellers".
  • the drive means to the drafting rollers may take any suitable mechanical, electromechanical or electronic form.
  • a differential gear drive acts between the measuring rollers and the drafting rollers e.g. providing direct transmission between one roller of each set, and this provides the normal required drafting ratio.
  • a further differential gear may be provided, which adds to, or subtracts from the output of the first mentioned differential gear, and which receives two separate control inputs, one of which is supplied by a sliver deviation monitoring signal rom the measuring rollers, an the other of which is derived from a deviation signal from the comparator which receives from the monitoring device a signal representative of the ratio between peripheral distance travelled by one of the measuring rollers relative to the peripheral distance travelled by one of the drafting rollers.
  • the drafting system comprises a single pair of drafting rollers arranged downstream of the measuring rollers, in which case the monitoring device monitors the ratio between the peripheral distance travelled by the measuring rollers relative to the peripheral distance travelled by the drafting rollers.
  • the drafting system comprises consecutive pairs of drafting rollers.
  • FIG. 1 of the drawings there is shown schematically a combined carding and drafting system, in which the carding zone and measuring rollers is shown by zone A, and the drafting zone is shown by reference B.
  • a carding machine is shown schematically by reference 10, and a feeding device in the form of feed plate 11 and feeding roller 12 provide input of lap to the card in well known manner, and a funnel or trumpet 13 forms part of a condenser downstream of the card 10 to form a sliver.
  • a set of measuring rollers 14 and 15 is arranged to receive the sliver, and rotate at a generally pre-set speed, but are provided with monitoring devices which are able to monitor the sliver parameters, and to provide command signals in response to deviation of these parameters from a desired value.
  • sliver thickness is monitored, and one of the measuring rollers is able to move radially relative to the other roller as a consequence of fluctuation in sliver thickness, and thereby provide an appropriate position detection signal (PDS - see Figure 2).
  • a feedback control (not shown in detail) is provided which responds to deviation monitoring by the measuring rollers 14, 15, and to make compensating adjustment in the speed of operation of the feeding device, which may comprise adjustment in the speed of rotation of feeding roller 12.
  • This type of control over the rate of input to the card 10 is well known, and may take any convenient mechanical or electromechanical form.
  • the component parts of the zone A which have been described comprise a standard "closed loop levelling card”.
  • the drafting zone B comprises a set of drafting rollers 16 arranged downstream of the measuring rollers 14, 15, and operable to rotate at a predetermined peripheral speed relative to the speed of the measuring rollers 14, 15, to provide a required drafting ratio.
  • the zone B comprises an open loop draft leveller, in which sensing is carried out in the measuring rollers 14, 15, and the drafting rollers 16 are capable of being driven at variable speed.
  • the zone A produces a precise long term levelled sliver, namely long lengths of sliver having the same weight per yard.
  • zone B The average draft carried out in zone B is shown by reference d, and therefore if the sliver weight measured at the measuring rollers (TG rollers) 14, 15 doubles, the draft immediately doubles.
  • the periphery of drafting rollers 16 in the long run must travel d times the periphery travelled by the measuring rollers 14, 15.
  • the peripheral distances run by the measuring rollers 14, 15, and the drafting rollers 16 are constantly measured, as will be described in more detail below with reference to Figure 2. If the ratio of the distances run differs from d, then a small increment of base speed is added to, or subtracted from the original speeds of the drafting rollers 16, as commanded by deviations from correct sliver weight as signalled by the measuring rollers 14, 15.
  • zone A there is provided a feedback control which responds to deviation monitoring by the measuring rollers when deviation in sliver parameter is measured, and which thereby makes compensating adjustment (after integration) in the speed of operation of the feeding device, in respect of the zone B, there is a two-part feed-forward control which is coupled with the drafting rollers 16 and which detects long term deviation or "drift" from the pre-set speed, and thereby make compensating adjustment in the speed of the drafting rollers 16.
  • FIG 2 shows schematically a mechanical coupling between the measuring rollers and the drafting rollers, and this is one preferred way of achieving the necessary control.
  • other mechanical, electromechanical, or electronic control systems may be provided if desired.
  • measuring roll 14 is movable up and down as shown by the arrows, in response to sliver variation, and an axial position detector APD responds to this movement, and issues a position detector signal PDS to motor M.
  • This signal will also be utilised to control the speed of operation of the feeding device 12, after integration as shown schematically.
  • a peripheral distance detector shown by reference D1 e.g. a rotational speed monitor
  • D2 monitors the distance travelled by one of the drafting rollers 16.
  • a differential gear I provides primary drive between the measuring rollers and the drafting rollers and is shown schematically between roller 15 of the set of measuring rollers, and to one of the drafting rollers 16. This drives the drafting rollers at a predetermined speed to provide a required drafting ratio (say 1.3:1). However, there is superimposed on this drive transmission two separate controls via a second differential gear II which is operated by motor M and control motor m . This provides input to the differential gear I, to control the output speed transmitted to the drafting rollers 16.
  • Sliver parameter monitoring by the measuring rollers 14 and 15 issues position detector signal PDS to the motor M, which drives the differential gear II accordingly, and thereby provides a first part of a feed-forward control to the drive means (first differential gear I) in order to vary the speed of the drafting rollers accordingly.
  • Deviation signal DS to motor m applies an input to second differential gear II, which provides a further and separate control input to the differential gear I.
  • a further set of measuring rollers may be added downstream of the drafting system, and preferably with a trumpet or funnel upstream of the further set of rollers.
  • additional rollers preferably tongue and groove rollers
  • feed roller levelling will generally still be used.
  • Figure 1 of the drawings shown an embodiment in which the drafting zone B is defined between a pair of measuring rollers, 14, 15 and a downstream pair of drafting rollers 16.
  • other embodiments of the invention may have different types of drafting system, in which consecutive pairs of drafting rollers form the drafting system.
  • the relative speeds of the consecutive pairs of rollers is controlled by drive means to provide the required drafting ratio.
  • sliver passing through measuring rollers 14, 15 is then received by a drafting zone comprising consecutive pairs of drafting rollers 31 and 32, whose relative speeds can be varied to provide a required drafting ratio by suitable drive means. This provides a constant speed tension draft in the zone between upstream drafting rollers 31 and the tongue and groove measuring rollers 14, 15.
  • FIG. 4 An alternative arrangement is shown in Figure 4, in which the drafting zone comprises tongue and groove rollers 33, a trumpet 34 downstream of rollers 33, and a second set of tongue and groove rollers 35. Variable speed between pairs of rollers 33 and 35 provides the required drafting ratio.
  • Figure 5 shows another embodiment, in which drafting zone B is an "open loop" system. Sliver first passes between tongue and groove rollers 36, and then onwardly to further rollers 37, and a variable speed is set between rollers 36 and 37, and downstream of rollers 37 is a further pair of tongue and groove rollers 38, from which can be derived a signal feeding to control motor m.
  • FIG. 6 A still further embodiment is shown in Figure 6, in which the drafting zone B include tongue and groove rollers 36, and downstream thereof two consecutive pairs of vari-speed rollers 39 and 40, followed by trumpet 41 and final tongue and groove rollers 42, also supplying signal to control motor m.

Landscapes

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

Claims (7)

  1. Vorrichtung zur Steuerung der Bildung von Faserband, mit
    einer Karde (10),
    einer in Transportrichtung oberhalb der Karde angeordneten Einführvorrichtung (11, 12) zum Einführen von Vlies oder Baumwollwatte in die Karde,
    einem in Transportrichtung unterhalb der Karde (10) angeordneten Verdichter (13) zur Bildung von Faserband,
    einem Satz Meßwalzen (14, 15), die so angeordnet sind, daß sie das Faserband aufnehmen und dessen Parameter überwachen, wobei diese Walzen auf Abweichungen von einem Sollwert reagieren,
    einer Rückkopplungssteuerung, die so aufgebaut ist, daß sie auf die Abweichungsüberwachung (Axialpositionserfassung) der Meßwalzen (14, 15) reagiert und eine kompensierende Regulierung der Arbeitsgeschwindigkeit der Einführvorrichtung (11, 12) ausführt,
    einem Streckwerk mit Streckwalzen (16), die in Transportrichtung unterhalb der Meßwalzen (14, 15) angeordnet sind,
    einer Antriebseinrichtung, die die Streckwalzen so antreibt, daß das erforderliche Streckverhältnis erlangt wird, und
    einer Optimalwertsteuerung, die ebenfalls so aufgebaut ist, daß sie auf die Abweichungsüberwachung der Meßwalzen (14, 15) reagiert, und mit der Antriebseinrichtung so verbunden ist, daß sie eine entsprechende Änderung der Drehzahl der Streckwalzen (16) herbeiführt,
       gekennzeichnet durch
    a) eine Einrichtung zur Überwachung des Verhältnisses zwischen den Umfangsweg D1, der von aufeinanderfolgenden Walzen (16) des Streckwerks zurückgelegt wird, wobei diese Vorrichtung das durchschnittliche Verhältnis über einen gewissen Zeitraum hinweg mit einem Sollwert vergleicht und bei Bedarf ein Abweichungssignal ausgibt, sowie
    b) eine Einrichtung, die der Antriebseinrichtung als weitere Steuerung das Abweichungssignal zuführt, um die Drehzahl der Streckwalzen (16) zu ändern.
  2. Vorrichtung nach Anspruch 1, bei der die Rückkopplungssteuerung der Einführvorrichtung (11, 12) eine mechanische oder elektromechanische Steuerung des in Regulierstrecken verwendeten Typs umfaßt.
  3. Vorrichtung nach Anspruch 1 oder 2, bei der die Antriebseinrichtung für die Streckwalzen eine mechanische, elektromechanische oder elektronische Antriebseinrichtung umfaßt.
  4. Vorrichtung nach Anspruch 3, bei der es sich bei der Antriebseinrichtung um einen mechanischen Antrieb handelt, der ein Differentialgetriebe (I) umfaßt, das direkt zwischen den Meßwalzen (14, 15) und den Streckwalzen (16) wirkt.
  5. Vorrichtung nach Anspruch 4, mit einem weiteren Differentialgetriebe (II), das die Abtriebdrehzahl des ersten Differentialgetriebes (I) erhöhen oder senken kann und zwei separate Führungsgrößen erhält, von denen die eine mittels eines von den Meßwalzen (14, 15) kommenden Überwachungssignals, das Abweichungen der Faserbandparameter anzeigt, zugeführt wird und die andere von einem Überwachungssignal, das von einem dieses Überwachungssignal von der Überwachungseinrichtung erhaltenden Komparator (17) kommt, abgeleitet wird.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, bei der das Streckwerk ein einziges Paar in Transportrichtung nach den Meßwalzen angeordnete Streckwalzen (16) umfaßt und die Überwachungseinrichtung das Verhältnis zwischen dem Umfangsweg, der von den Meßwalzen zurückgelegt wird, und dem Umfangsweg, der von den Streckwalzen zurückgelegt wird, überwacht.
  7. Vorrichtung nach einem der Ansprüche 1 bis 5, bei der das Streckwerk aufeinanderfolgende Paare Streckwalzen (31, 32; 33, 35) umfaßt.
EP94920560A 1993-07-14 1994-07-13 Kardier-verzug regelanordnung Expired - Lifetime EP0708849B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9314538 1993-07-14
GB939314538A GB9314538D0 (en) 1993-07-14 1993-07-14 Carding/drafting leveller system
PCT/GB1994/001517 WO1995002720A1 (en) 1993-07-14 1994-07-13 Carding/drafting leveller system

Publications (2)

Publication Number Publication Date
EP0708849A1 EP0708849A1 (de) 1996-05-01
EP0708849B1 true EP0708849B1 (de) 1999-03-10

Family

ID=10738787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94920560A Expired - Lifetime EP0708849B1 (de) 1993-07-14 1994-07-13 Kardier-verzug regelanordnung

Country Status (6)

Country Link
EP (1) EP0708849B1 (de)
JP (1) JPH09502770A (de)
DE (1) DE69417036D1 (de)
GB (1) GB9314538D0 (de)
IN (1) IN181817B (de)
WO (1) WO1995002720A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1281339B1 (it) * 1995-11-27 1998-02-18 Marzoli & C Spa Macchina tessile in cui la posizione del gruppo di stiro e' regolabile rispetto al doffer in modo da uniformare la qualita' del prodotto
GB2315498B (en) * 1996-06-29 2001-01-24 Truetzschler Gmbh & Co Kg Apparatus and method for forming a fibre web into a fibre sliver
EP1009870B2 (de) † 1997-09-01 2008-09-17 Maschinenfabrik Rieter Ag Reguliertes streckwerk
DE102013113308A1 (de) * 2013-12-02 2015-06-03 Rieter Ingolstadt Gmbh Textilmaschine mit variablem Anspannverzug

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3617525A1 (de) * 1986-05-24 1987-11-26 Truetzschler & Co Vorrichtung zur vergleichmaessigung eines kardenbandes oder krempelvlieses
DE3821238A1 (de) * 1988-06-23 1989-12-28 Rieter Ag Maschf Verfahren und vorrichtung zur herstellung eines gleichmaessigen faserbandes
EP0354653B1 (de) * 1988-08-09 1996-04-10 John D. Hollingsworth On Wheels Inc. Streckvorrichtung mit selbsttätigem Ausgleich
US5152033A (en) * 1991-07-15 1992-10-06 Myrick-White, Inc. Textile apparatus/method for reducing variations in silver weight

Also Published As

Publication number Publication date
WO1995002720A1 (en) 1995-01-26
IN181817B (de) 1998-10-03
JPH09502770A (ja) 1997-03-18
EP0708849A1 (de) 1996-05-01
GB9314538D0 (en) 1993-08-25
DE69417036D1 (de) 1999-04-15

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