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WO1993021368A1 - Detecteur de profil mobile, en particulier pour detecter des aiguilles abîmees de machine a tricoter - Google Patents

Detecteur de profil mobile, en particulier pour detecter des aiguilles abîmees de machine a tricoter Download PDF

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Publication number
WO1993021368A1
WO1993021368A1 PCT/IT1992/000038 IT9200038W WO9321368A1 WO 1993021368 A1 WO1993021368 A1 WO 1993021368A1 IT 9200038 W IT9200038 W IT 9200038W WO 9321368 A1 WO9321368 A1 WO 9321368A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
detector
needles
fact
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.)
Ceased
Application number
PCT/IT1992/000038
Other languages
English (en)
Inventor
Bruno Pirone
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/IT1992/000038 priority Critical patent/WO1993021368A1/fr
Publication of WO1993021368A1 publication Critical patent/WO1993021368A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/18—Indicating, warning, or safety devices, e.g. stop motions responsive to breakage, misplacement, or malfunctioning of knitting instruments

Definitions

  • Fig.s 7a to 71 show time graphs of signals picked up at various points in the Fig.6 circuit
  • each needle 3 presents an elongated body 4 (shown partially) having a hooked end or hook 5 and a tongue 6 pivoting on body 4 at 7, and is grounded as shown schematically at 8.
  • one or more needles 3 may break or bend, breakage usually consisting in the hook 5 breaking off roughly at the point shown by the dot and dash line 9 in Fig.2, and bending normally consisting in the needle bending inwards or outwards of drum 2.
  • any damaged needles 3 are detected by providing an electrode 10 facing and in a position of relative motion in relation to needles 3, so as to detect the passage of one needle at a time, and by biasing the electrode to such a voltage as to produce a series of electric discharges between itself and needles 3 as these move past the electrode.
  • the electric discharges are produced continuously one after the other, and present a roughly constant frequency and amplitude (power) when needles 3 moving past the electrode are undamaged.
  • the electric discharges which in this case may even be absent, present a different frequency and/or amplitude. Any broken or bent needles may therefore be detected by detecting a variation in the discharges, thus enabling the machine to be stopped immediately.
  • electrode 10 presents a flat front surface 96 blending continuously (at 97) with lateral surfaces 98, the width of front surface 96 being roughly equal to the distance a between adjacent needles 3.
  • Point 18 between resistors 11 and 12 presents stray capacitances shown schematically by a condenser 24.
  • Point 18 is also connected to a condenser 25, e.g. 5pF, the other terminal of which is connected to a grounded resistor 27 via a shielded wire 26 to the circuit 13 board; condenser 25 and resistor 27 constituting a discharge sensor for generating an electric signal indicating the presence or absence of electrical discharges.
  • the non-inverting input of amplifier 29 is grounded via resistor 33, and its output is fed back to its inverting input via resistor 34.
  • the output of amplifier 29 is connected to one terminal of a condenser 35, the other terminal of which is connected to the cathode of a diode 36, the anode of which is grounded.
  • the cathode of diode 36 is also connected to the anode of a further diode 37, the cathode of which is connected to a terminal of a condenser 38 and resistor 39 constituting an RC filter.
  • the parameters of the detector according to the present invention are so selected as to produce a number of discharges in the time (T 3 in Fig.7c) taken by each needle to move past electrode 10.
  • T 3 in Fig.7c the time taken by each needle to move past electrode 10.
  • the above parameters are so selected as to produce discharges at a frequency of a few tens of a kilocycle.
  • the device according to the present invention can be set easily and quickly; is immediately operative following replacement of the needle and startup of the motor; and, by means of switch 66, can easily be adapted to work involving one or more or no missing needles.
  • the device is extremely easy to assemble by simply requiring adjustment of the distance between electrode 10 and needles 3, which, with the assistance of LEDs 49, 50 and 74, involves no particular accuracy.
  • the device is straightforward in design and, with no components directly contacting the needles, is subject to very little wear and therefore cheap to produce. To those skilled in the art it will be clear that changes may be made to the device as described and illustrated herein without, however, departing from the scope of the present invention.
  • the device may be employed, with no alterations required, for detecting breakage of tongue 6, in which case, electrode 10 need simply be mounted facing tongue 6 in a given operating position (e.g. in the open position shown in Fig.2).
  • the device may also be applied to circular fixed-drum or straight knitting machines, in both of which cases, instead of being fixed as in the example shown, the electrode moves past the needles on a slide or similar conveying system.
  • circuit 13 may present components other than those described herein, providing it is capable of detecting a variation in discharge frequency and amplitude.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Abstract

Un détecteur de profil mobile, en particulier pour détecter des aiguilles abîmées de machine à tricoter, où une électrode (10) montée en une position fixe en face de la trajectoire des aiguilees (3) sur un tambour rotatif est polarisée et dimensionnée de manière à produire une séquence de décharges électriques, dont la fréquence et l'amplitude sont proportionelles à la distance entre l'aiguille (3) et l'électrode (10). Les décharges électriques sont détectées par un détecteur connecté à l'électrode (10) et elles sont conçues pour émettre un signal de décharge électrique qui est fourni pour traitement à une unité de détection d'aiguille abîmée, pour émettre un signal de sortie d'alarme quand aucune décharge ne se produit entre l'électrode et l'aiguille ou que la fréquence ou l'amplitude des décharges diffère de valeurs prédéterminées de référence, par suite d'une cassure ou d'une détérioration de l'aiguille.
PCT/IT1992/000038 1992-04-08 1992-04-08 Detecteur de profil mobile, en particulier pour detecter des aiguilles abîmees de machine a tricoter Ceased WO1993021368A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT1992/000038 WO1993021368A1 (fr) 1992-04-08 1992-04-08 Detecteur de profil mobile, en particulier pour detecter des aiguilles abîmees de machine a tricoter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT1992/000038 WO1993021368A1 (fr) 1992-04-08 1992-04-08 Detecteur de profil mobile, en particulier pour detecter des aiguilles abîmees de machine a tricoter

Publications (1)

Publication Number Publication Date
WO1993021368A1 true WO1993021368A1 (fr) 1993-10-28

Family

ID=11331869

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1992/000038 Ceased WO1993021368A1 (fr) 1992-04-08 1992-04-08 Detecteur de profil mobile, en particulier pour detecter des aiguilles abîmees de machine a tricoter

Country Status (1)

Country Link
WO (1) WO1993021368A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006119655A1 (fr) * 2005-05-11 2006-11-16 Maschinenfabrik Rieter Ag Procede de mesure sans contact et dispositif integre dans une machine textile
EP3564420B1 (fr) 2018-05-02 2021-07-07 Trützschler GmbH & Co. KG Procédé et dispositif de traitement de fibres
JP2022531897A (ja) * 2019-05-09 2022-07-12 ビティエッセエッレ インターナショナル ソチエタ ペル アチオーニ 針を用いる繊維機械において破損した針の存在を検出するための方法及びシステム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2631609A1 (de) * 1975-09-12 1977-03-17 Elitex Zavody Textilniho Ueberwachungsvorrichtung
DE3513799C1 (de) * 1985-04-17 1986-04-10 Daimler-Benz Ag, 7000 Stuttgart Geraet zur beruehrungslosen Abstandsermittlung mittels Funkenentladung
DE3920380A1 (de) * 1988-02-29 1990-02-01 Trikotex Veb Vorrichtung zur kontrolle der arbeitsweise von nadeln an strickmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2631609A1 (de) * 1975-09-12 1977-03-17 Elitex Zavody Textilniho Ueberwachungsvorrichtung
DE3513799C1 (de) * 1985-04-17 1986-04-10 Daimler-Benz Ag, 7000 Stuttgart Geraet zur beruehrungslosen Abstandsermittlung mittels Funkenentladung
DE3920380A1 (de) * 1988-02-29 1990-02-01 Trikotex Veb Vorrichtung zur kontrolle der arbeitsweise von nadeln an strickmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006119655A1 (fr) * 2005-05-11 2006-11-16 Maschinenfabrik Rieter Ag Procede de mesure sans contact et dispositif integre dans une machine textile
EP3564420B1 (fr) 2018-05-02 2021-07-07 Trützschler GmbH & Co. KG Procédé et dispositif de traitement de fibres
JP2022531897A (ja) * 2019-05-09 2022-07-12 ビティエッセエッレ インターナショナル ソチエタ ペル アチオーニ 針を用いる繊維機械において破損した針の存在を検出するための方法及びシステム

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