EP0071141A2 - Luntenwächter für Florteiler der Spinnkarden - Google Patents

Luntenwächter für Florteiler der Spinnkarden Download PDF

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Publication number
EP0071141A2
EP0071141A2 EP82106479A EP82106479A EP0071141A2 EP 0071141 A2 EP0071141 A2 EP 0071141A2 EP 82106479 A EP82106479 A EP 82106479A EP 82106479 A EP82106479 A EP 82106479A EP 0071141 A2 EP0071141 A2 EP 0071141A2
Authority
EP
European Patent Office
Prior art keywords
feeler
units
slivers
amplifier
signal
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.)
Withdrawn
Application number
EP82106479A
Other languages
English (en)
French (fr)
Other versions
EP0071141A3 (de
Inventor
Paolo Bobbola
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.)
Roj Electrotex SpA
Original Assignee
Roj Electrotex SpA
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 Roj Electrotex SpA filed Critical Roj Electrotex SpA
Publication of EP0071141A2 publication Critical patent/EP0071141A2/de
Publication of EP0071141A3 publication Critical patent/EP0071141A3/de
Withdrawn legal-status Critical Current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
    • D01G31/00—Warning or safety devices, e.g. automatic fault detectors, stop motions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • 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
    • D01G15/52—Web-dividing arrangements

Definitions

  • This invention relates to a device for checking the presence of slivers at the divider outlet of carding machines, and for signalling the absence or breakage of one or more of said slivers.
  • a known system for detecting the presence of slivers comprises a photoelectric optical barrier.
  • a modulated light beam travels along each sliver intake path over the whole of its length, in a position which coincides with the falling trajectory of each sliver.
  • the sliver does not interrupt the optical barrier on breaking, so that there is no indication. In these cases the broken sliver is entrained by the adjacent one and is not indicated.
  • Another known system utilises the resultant falling action of a lever supported by the sliver.
  • the isolated lever As the lever is electrically isolated from earth and is kept distant from a common earthing surface by the sliver, the isolated lever has to be preloaded with a certain tension and given a secure path of travel in order to ensure its proper operation.
  • the object of the invention is to provide a device for checking and indicating sliver breakage which is able to monitor the movement of the slivers in their direction of movement, independently of their tension, by means of detection members which emit electrical signals when in contact with said slivers.
  • a further object of the invention is to provide a simple circuit configuration for such a device which avoids the need to use a separate amplifier for each of said detection members in order to amplify the electrical signals emitted thereby.
  • the checking and indicating device is essentially characterised by comprising: a number of piezoelectric feeler units equal to the number of slivers to be checked, and on which said slivers are simply rested and slide during their movement, said feeler units converting the mechanical vibrations produced by the movement of the slivers on said units into oscillating electrical signals; a switchable channel fed by said piezoelectric feeler units and conveying to a single output at different moments of time the signals which reach the channel at separate inputs; a single signal amplifier tuned to the frequency range produced by the feeler units; a selection circuit which chooses only one feeler unit at any given moment and connects it to the amplifier; and an actuator circuit which integrates the signal originating from the amplifier and produces a stop signal and/or activates alarm means if one or more of the signals originating from the feeler units are indicative of a broken or absent sliver.
  • Each feeler unit of this device comprises a suitably shaped and treated metal member on which the sliver rests and runs, and to which a piezoelectric ceramic member is rigidly fixed.
  • the device according to the invention comprises a number of piezoelectric feeler units T such as those shown in Figures 1 and 2 equal to the number of slivers to be checked.
  • Each of these units which are designed to convert the mechanical vibrations due to the sliver movement into an oscillating electrical signal, comprises a feeler element 1 constituted by a metal member in the shape of a curved plate on which the sliver S simply rests and slides as it leaves the carding machine divider.
  • the outer surface of the member 1 on which the sliver slides is treated to produce very low friction and maximum resistance to wear by rubbing.
  • a piezoelectric ceramic bush 2 is cemented to the metal member 1 and is disposed in a position such as to provide the maximum electrical signal/sliding transformation ratio.
  • the feeler unit is connected to the electronic circuit by conductors 3 and 4.
  • the conductor 3 connected to the piezoxide carries the electrical signal, while the conductor 4 connects the feeler member to earth, to prevent accumulation of electrostatic charges on the feeler unit.
  • a number of feeler units are generally enclosed in a suitable container and disposed at a fixed distance apart to constitute a detector module.
  • Each detector module is connected to the electronic circuit by a screened cable comprising n + 1 conductors, where n is the number of units constituting the module. It has been found convenient for each module to comprise twelve units. Several modules are connected to the same electronic circuit.
  • a preferred configuration of the invention comprises four modules of twelve units each, which are connected to the same electronic control circuit. The number of possible combinations is however obviously very great.
  • the signals emitted by said units are selected by electronic switches Il, I2, ... In controlled by a selection circuit CS, such that only one signal at a time, namely that originating from the selected detection unit, is present at the input of the amplifier A at any given moment.
  • the output signals UA from the amplifier A are fed to an actuator circuit CA, to which the synchronisation signals SS are also fed by the selection circuit.
  • the actuator circuit CA is shown in greater detail in Figure 5, again in the form of a block diagram.
  • This is a constant integration circuit in which the signal UA fed by the amplifier A is filtered by the integrator I in accordance with a suitable time constant such as not to be influenced by the sliver fluctuations on the feeler movement, and is then fed to a memory Ml.
  • the actuator circuit CA also comprises a second memory M2 arranged to emit signals ALT for halting the machine being monitored, and for activating alarm means AL and a warning lamp L.
  • the memory M2 is fed both by the signals SR from the first memory M1 and by signals R which, by way of a pulse counter n, reach a gate P which is also fed by both the synchronisation signals SS and the halt signals produced by said memory M2.
  • the signal present at the output of the amplifier A is indicated by UA. It can be seen that when sliding over one of the detection units ceases, the signal at the output of the amplifier A does not cease until the corresponding unit is connected to it by the channel CC by means of the corresponding selection signal.
  • the ALT signal is provided to correspond with the corresponding synchronisation signal SS.
  • the time period Tl which determines the selection rate of the inputs and thus of the system is fixed in accordance with the time constant chosen for the integrator I of the circuit CA.
  • the response speed is given by n x Tl, where n is the number of connected detection units and Tl the time necessary for checking whether sliver sliding is occurring on each detection unit.
  • the memory M1 supplies the signal SR. This signal is memorised by the memory M2, which causes the lamp L to light.
  • the ALT signal thus generated opens the gate P, which allows the synchronisation pulses to pass, these then being counted.
  • the signal R is generated when the i th detection unit is again selected.
  • the signal R deactivates the memory M2 which is however immediately reactivated by SR if the i th sliver has not yet been made good, and the cycle continues in this manner until said sliver has been made good.
  • Figure 7 shows a further embodiment of the actuator circuit CA which gives greater response speed of the system.
  • It comprises two integrators, a fast integrator Il and a slow integrator I2 in place of the single integrator I, and two memories Ml and M2, two gates Pl and P2, and a pulse counter m.
  • the signal UA originating from the amplifier A is integrated by the fast integrator Il in accordance with a time constant lower than that'used in the previously described embodiment of Figure 5.
  • Ml When a signal is present at the output of Il which indicates a defect in the sliding of the sliver, Ml generates a signal AR which requests a stoppage, this signal blocking the selection circuit CS of the device at the feeler unit which has just been selected.
  • the signal UA is integrated by the slow integrator 12 in accordance with the suitable time constant, and is read by the memory 1-2 which generates the ALT signal in the case of breakage of the sliver.
  • the response time of the system is less than in the case using the actuator circuit of Figure 4, because the selection time of each unit is less than the time used in deciding whether a sliver breakage has occurred.
  • Figure 9 shows the operational diagram of the switchable channel CC of Figure 3 in a preferred embodiment.
  • Each detection unit Tl, T2 ... Tn is connected to the analogue adder SA constituted by an operational amplifier with feedback in said configuration.
  • the controlled switches ICT1, ICT2 ... ICTn either short- circuit the signal originating from their own branch or allow it to pass, according to the control signal which they receive.
  • the selection circuit is constructed in such a manner that only one switch is open at any given moment, and all the others are closed.
  • the signal originating from only one detection unit passes to the amplifier by way of the band pass filter F (disposed at the adder output to reduce noise).
  • the switchable channel is constituted by the set of feeler units Tl, T2 ... Tn, to each of which a controlled electronic switch is connected in parallel. At any given moment only one of these switches is selected into the open position by the selection circuit CS, all others being closed.
  • the switchable channel is constituted by an analogue adder having a number of inputs equal to the number of feeler units Tl, T2 ... Tn. Each of these units is connected by a corresponding controlled electronic switch ICT1, ICT2 ... ICTn, which can be selected into the open or closed position by the selection circuit CS.
  • the invention also covers other embodiments different from those described and illustrated provided they fall within the scope of the inventive idea.
  • a sole amplifier combined with a switchable channel and with a selection circuit
  • an amplifier and an actuator for each feeler unit would be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP82106479A 1981-07-29 1982-07-19 Luntenwächter für Florteiler der Spinnkarden Withdrawn EP0071141A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23225/81A IT1138893B (it) 1981-07-29 1981-07-29 Dispositivo di controllo della presenza degli stoppini all'uscita del divisore di carde di filatura
IT2322581 1981-07-29

Publications (2)

Publication Number Publication Date
EP0071141A2 true EP0071141A2 (de) 1983-02-09
EP0071141A3 EP0071141A3 (de) 1983-08-31

Family

ID=11205089

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106479A Withdrawn EP0071141A3 (de) 1981-07-29 1982-07-19 Luntenwächter für Florteiler der Spinnkarden

Country Status (2)

Country Link
EP (1) EP0071141A3 (de)
IT (1) IT1138893B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914785A (en) * 1987-08-05 1990-04-10 Schubert & Salzer Maschinenfabrik Aktiengesellschaft Device to feed fiber silvers
DE19627194A1 (de) * 1995-09-25 1997-03-27 H J Scheinhuette Entwicklungen Karde mit Vorrichtung zum Ausscheiden von Fremdfasern
CN105040189A (zh) * 2015-08-14 2015-11-11 吴江福爱梁纺织有限公司 可报警的气流防轧安全装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE666905A (de) *
US3330007A (en) * 1966-01-04 1967-07-11 Spring Mills Inc Lapper stop motion
DE1928430A1 (de) * 1968-06-15 1969-12-18 Algemene Kunstzijde Unie Nv Verfahren und Vorrichtung zum Feststellen von Stoerungen bei der Bewegung eines endlosen Materials
EP0023583A1 (de) * 1979-08-03 1981-02-11 Akzo GmbH Verfahren und Vorrichtung zum Erkennen von Fadenzugkraftunterschieden
GB2059594A (en) * 1979-09-14 1981-04-23 Mettler Soehne Maschf Piezoelectric transducer for producing a signal depending on the tensile force of a textile thread

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE666905A (de) *
US3330007A (en) * 1966-01-04 1967-07-11 Spring Mills Inc Lapper stop motion
DE1928430A1 (de) * 1968-06-15 1969-12-18 Algemene Kunstzijde Unie Nv Verfahren und Vorrichtung zum Feststellen von Stoerungen bei der Bewegung eines endlosen Materials
EP0023583A1 (de) * 1979-08-03 1981-02-11 Akzo GmbH Verfahren und Vorrichtung zum Erkennen von Fadenzugkraftunterschieden
GB2059594A (en) * 1979-09-14 1981-04-23 Mettler Soehne Maschf Piezoelectric transducer for producing a signal depending on the tensile force of a textile thread

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4914785A (en) * 1987-08-05 1990-04-10 Schubert & Salzer Maschinenfabrik Aktiengesellschaft Device to feed fiber silvers
DE19627194A1 (de) * 1995-09-25 1997-03-27 H J Scheinhuette Entwicklungen Karde mit Vorrichtung zum Ausscheiden von Fremdfasern
DE19627194C2 (de) * 1995-09-25 2001-09-13 H J Scheinhuette Entwicklungen Karde mit Vorrichtung zum Ausscheiden von Fremdfasern
DE19627194C5 (de) * 1995-09-25 2006-02-09 H.-J. Scheinhütte Entwicklungen, Systeme Karde mit Vorrichtung zum Ausscheiden von Fremdfasern
CN105040189A (zh) * 2015-08-14 2015-11-11 吴江福爱梁纺织有限公司 可报警的气流防轧安全装置

Also Published As

Publication number Publication date
IT8123225A0 (it) 1981-07-29
EP0071141A3 (de) 1983-08-31
IT1138893B (it) 1986-09-17

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Inventor name: BOBBOLA, PAOLO