EP0058510A2 - Überwachungsanlage und Überwachungsverfahren - Google Patents

Überwachungsanlage und Überwachungsverfahren Download PDF

Info

Publication number
EP0058510A2
EP0058510A2 EP82300646A EP82300646A EP0058510A2 EP 0058510 A2 EP0058510 A2 EP 0058510A2 EP 82300646 A EP82300646 A EP 82300646A EP 82300646 A EP82300646 A EP 82300646A EP 0058510 A2 EP0058510 A2 EP 0058510A2
Authority
EP
European Patent Office
Prior art keywords
monitor
elements
transmitter
signal
receiver
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
EP82300646A
Other languages
English (en)
French (fr)
Other versions
EP0058510A3 (de
Inventor
Desmond Mcgavock Blair
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.)
Management Development Services (ni) Ltd
Original Assignee
Management Development Services (ni) Ltd
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 Management Development Services (ni) Ltd filed Critical Management Development Services (ni) Ltd
Publication of EP0058510A2 publication Critical patent/EP0058510A2/de
Publication of EP0058510A3 publication Critical patent/EP0058510A3/de
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • D04B35/14—Indicating, warning, or safety devices, e.g. stop motions responsive to thread breakage
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D39/00—Pile-fabric looms
    • D03D39/02—Axminster looms, i.e. wherein pile tufts are inserted during weaving
    • D03D39/08—Gripper Axminster looms

Definitions

  • the present invention relates generally to a ' monitor and particularly, but not exclusively, to a monitor for monitoring the presence of yarns or other elongate elements in looms, braiding machines, knitting machines and other similar such apparatus.
  • Looms including fault monitoring systems are known in the United Kingdom.
  • a device is provided for scanning the carpet produced by the loom to produce an electrical signal. The signal is then examined and any deviation from the norm indicative of a fault noted.
  • This solution therefore is curative rather than preventive with all the disadvantages that that entails.
  • a mechanical device is employed to detect the presence of yarns. This system necessitates the yarns being subject to a force by the mechanical device and such physical contact can lead to problems with the yarn and should be avoided if at all possible.
  • a monitor for monitoring the presence of a plurality of elements comprising a sensor comprising a transmitter for emitting a beam of radiation towards the elements, a receiver for receiving the beam of radiation, signal processing circuitry for processing the output of the receiver and means for assessing the processed signal in order to determine the absence of a missing element in the elements being monitored.
  • a preferred embodiment of the invention may comprise any one or more of the following preferred features:-
  • the above defined monitor may be incorporated in a gripper loom for the production of tufted carpets.
  • the sensor is mounted on the knife block so that the presence of yarns is sensed thereby prior to cutting to produce the tufts and whilst being held by the associated grippers.
  • the loom may have several knife blocks with respective sensors. An additional sensor may be included on a knife block to enable the grippers. to be counted.
  • a method of monitoring the presence of a plurality of elements including the steps of scanning the elements with a sensor comprising a transmitter and receiver processing the output produced by the receiver and assessing the processed signal in order to determine the absence of a missing element in the elements being monitored.
  • the monitor of the invention will be described as applied to a gripper carpet loom.
  • lengths of yarn 1 are gripped and drawn from respective yarn carriers (not shown) between respective pairs of teeth 2 of a saw bar 3 by respective grippers 4.
  • These lengths of yarn 1 are subsequently cut by a knife blade 5 mounted on a knife box 6, to produce carpet tufts 7 and the tufts transferred to the weft shed of the carpet being woven (not shown) by the grippers 4 before being locked into the weave of the carpet by a weft shot being beaten over it. If a tuft 7 is missing this will automatically result in a fault being woven into the carpet if the missing tuft is not detected before the weft shot corresponding to that line of tufts.
  • the monitor of the invention therefore seeks to monitor the tufts at the time they are produced.
  • the monitor comprises a sensor 8 which is monitored on the knife box 6 directly ahead of the blade 5 in the cutting direction thereof and which effectively operates to establish the pressence of yarn 1 immediately before that yarn 1 is cut to produce a tuft 7.
  • the senor comprises a head 20 moulded from "acetal" syntehtic plastics material.
  • This head defines apertures which accommodate a diode 21 and a phototransistor 22.
  • the positioning of the diode and transistor may be reversed if desired.
  • the slit is made by a saw cut and is about lmm deep to promote easy cleaning. Behind the slit are first placed two infra-red filters, one for each photo-device, made of gelatin and then the photo devices themselves.
  • the focal length of the devices is such as to give maximum reflection at 5 to 6mm from the tip of their lenses and these are therefore arranged at this distance ('d' in Figure 2) from the tuft being viewed.
  • the diode 21 emits in the infra-red region of the electromagnetic spectrum but emitting and receiving devices operating in other parts of the spectrum could be used if desired as could other forms of radiation such as ultrasonics.
  • the disposition of the diode 21 and phototransistor 22 in the head 20 is such that the infra-red beam is directed in a confined manner towards the yarn 1 to be detected and reflected by the yarn to be received by the phototransistor 22. As can be seen from Figure 2, the head 20 moves closely adjacent the yarn 1 at the point at which it is gripped by the corresponding gripper 4.
  • Each such gripper comprises a pair of jaws 23 pivotally connected together at 24.
  • the sensor head 20 forms part of a transmitter and the circuitry of this transmitter is shown in Figure 4.
  • the purpose of the circuit is to provide a pulsed current through the infra-red emitting diode 21. It comprises two integrated circuits IC1(a) and ' ICl(b) connected in series.
  • IC1(a) is an astable multivibrator circuit having unequal mark space ratio.
  • the output of ICl(a) is inverted by ICl(b) to produce a train of pulses of approximately 6US duration and amplitude 8.2 volts at a frequency of about 16 KHz.
  • This signal is used to drive two NPN transistors TR1 and TR2 which are connected as a darlington pair to produce a current through the diode 21 with a duty cycle of approximately 1 . 9.
  • the frequency of the pulse is adjustable by means of the 100 K potentiometer P in the feedback circuit of integrated circuit ICl(a).
  • the phototransistor 22 forms part of a receiver which includes a signal processing circuitry and the overall circuit of which is shown in Figure 3.
  • An exemplary signal waveform produced at the output of the phototransistor and the corresponding waveform after being processed for input to a computer is shown in Figure 6.
  • the signal produced by the phototransistor 22 on receipt of the reflected signal from each tuft being viewed is a pulse of substantially triangular shape and at a frequency of about 16 KHz. As the knife block with the sensor attached traverses the yarns, the sensor "sees" the yarns and peaks and troughs occur to modulate the amplitude of this signal superimposed on a d.c. level.
  • This resultant waveform for a series of black yarns B scanned with one yarn M missing is shown at A on Figure 5.
  • This signal occurs at point A on the circuit of Figure 4.
  • the carrier signal is referenced CS and the D.C. threshold level DC on waveform A.
  • the D.C. level is determined largely by the ambient light level and there may also be superimposed a signal at 100 Hz a 50Hz due to reflection or 'pick-up' by mains operated equipment or overhead lights.
  • the output from the phototransistor 22 is connected in the input of an integrated circuit operational amplifier ICl 741.
  • This acts as a high pass filter with a cut off below about 10KHz.
  • the D.C. and low frequency components have been removed to produce a waveform of the form shown at B on Figure 5.
  • Two further integrated circuits IC2 531 and IC3 531 are provided to form a non-inverting amplifier circuit with a maximum overall gain of 600.
  • the gain of IC2 531 is fully adjustable by means of a 100 K potentiometer 3P. This is nornally preset to give a fully clipped output at IC3 531 when the sensor is directly above a yarn that is at the point where maximum reflection occurs.
  • Integrated circuits IC2 531 and IC3 531 have diodes in their feedback connection so only positive going output pulses are obtained.
  • the waveform of the fully clipped signal at IC3 531 is shown at C in Figure 5.
  • the pulses which emerge from integrated circuit IC4(b) are differentiated in a further integrated circuit IC4(c) which gives an output which is proportional to the rate of change of the input signal.
  • IC4(c) constitutes a further 1 ⁇ 4 of the previously mentioned 348. The rate of change of the input is zero only at the peaks and troughs .
  • IC4(c) Since IC4(c) also inverts the signal its output goes from zero in a positive direction immediately after a peak has occurred that is after a yarn has been detected.
  • the waveform of the signal at the output of IC4(c) is shown at E on Figure 5.
  • This positive going signal is detected by a Schmitt trigger circuit - IC4(d) which constitutes the fourth of the 348 previously described.
  • Integrated circuit IC4(d) is provided with a sensitivity or 'threshold' control below which it will not respond. This is necessary to prevent accidental operation due to the presence of unwanted noise on the signal.
  • the output from IC4(d) is normally at approximately +12V and when triggered by a thread it goes to approximately -12V.
  • the leading edge of the negative going signal is used to trigger a monostable multivibrator consisting of integrated circuits IC5(b) and (c).
  • the monostable produces one pulse of fixed duration for every input trigger pulse.
  • Integrated circuit IC5(d) inverts the pulse to give a positive going pulse which varies from 0 to +12V.
  • This pulse set for a duration of 700ys, for example, is suitable for transmission by cable to the computer and its waveform is shown at F in Figure 5.
  • the integrated circuits IC5(a) to (d) constitute four quarters of a 4011B.
  • An alternative output is provided by IC5(a). This gives pulses of varying duration depending on the width of the thread and the speed of traverse of the sensors.
  • the processed signal is then sampled every 300 microseconds by the computer. This sampling period is chosen having regard to the duration of the pulses of the signal so that no pulse is missed.
  • the computer must be capable of accepting signals from nine sensors.
  • the computer assesses the input signals fed to it in order to detect missing yarns. This is achieved' by programming the computer with an algorithm or set of instructions. These "tell" the computor to compare the gap between adjacent pulses which represent the gap between adjacent yarns with the average of the gaps of say eight preceding pairs of adjacent pulses. If a gap greater than 1.8 times this average is detected this indicates a missing yarn. Of course the 1.8 ratio can be altered as desired to fit differing sets of circumstances. This method of assessing the pulses cannot be used satisfactorily for those pulses produced at the beginning and end of the travel of the knife blocks because the pulse gap is affected by the acceleration and decleration of the block and an acceptable comparison cannot be made.
  • the position of this yarn can be indicated by counting pulses using the most extreme right hand yarn, which is the first yarn "counted" by the sensor on the right hand knife block, as a reference. It may happen that the knife blades may not accurately divide the 1008 yarns into eight equal groups and, for the other sensors, some zero error correction may be necessary using this reference otherwise a misleading result may occur.
  • the gripper sensor can be employed to give an indication in the travel of the knife blades (since they all have the same travel) where the missing yarn is positioned.
  • the above described arrangement enables a missing yarn to be detected early on the weaving process and before a corresponding fault is produced in the carpet being woven thus enabling fault preventative action to be taken with considerable cost savings.
  • the system described may also be used on other types of loom than gripper looms and on other processes when numbers of elongate elements are an essential part of the process.
  • the described computerisation facilitates data logging. Records can be maintained and later printed out of the duration and nature of loom stoppages due to missing ends.
  • the system is capable of expansion to hold in memory predetermined patterns of missing ends in various sectors of the carpet design which would operate visual or audible alarms or warning or stop circuits. Furthermore, there is no physical contact between the sensors and the ends being detected which is most important particularly where damage to the yarn is a possibility.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP82300646A 1981-02-12 1982-02-09 Überwachungsanlage und Überwachungsverfahren Ceased EP0058510A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8104435 1981-02-12
GB8104435 1981-02-12

Publications (2)

Publication Number Publication Date
EP0058510A2 true EP0058510A2 (de) 1982-08-25
EP0058510A3 EP0058510A3 (de) 1982-10-13

Family

ID=10519654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82300646A Ceased EP0058510A3 (de) 1981-02-12 1982-02-09 Überwachungsanlage und Überwachungsverfahren

Country Status (2)

Country Link
EP (1) EP0058510A3 (de)
IE (1) IE52518B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392757A1 (de) * 1989-04-08 1990-10-17 Axminster Carpets Limited Fadenwächter
EP1156144A1 (de) * 2000-05-15 2001-11-21 Brintons Limited Einheit zum Bilden von Tuftinggarne und Webmaschine
BE1017750A3 (nl) * 2006-11-17 2009-06-02 Wiele Michel Van De Nv Inrichting en werkwijze voor het detecteren van niet gesneden pool bij het axminsterweven.
US7831331B1 (en) 2007-06-05 2010-11-09 Cyp Technologies, Llc Apparatus and method for detecting knife position on a tufting machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU10861A (en) * 1961-01-05 1963-01-10 The Cross Company Improvements in or relating to machine tools
DE1585331A1 (de) * 1965-03-16 1970-05-21 Sick Erwin Fotoelektrische Vorrichtung zur UEberwachung von Strick- oder Wirkmaschinen
DE1560973B1 (de) * 1962-09-05 1972-06-29 Colton Lewis Henry Einrichtung zum UEberwachen von Kettenwirkmaschinen mit einem optischen Beobachtungsgeraet
GB1281951A (en) * 1969-07-18 1972-07-19 Electronit Ltd Circular knitting machine
FR2298633A2 (fr) * 1975-01-22 1976-08-20 Inst Textile De France Dispositif de d
GB2022150A (en) * 1978-05-31 1979-12-12 Meiners Electronic Controls Lt Improvements in and relating to the detection of flaws, breakages discontinuities and the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU10861A (en) * 1961-01-05 1963-01-10 The Cross Company Improvements in or relating to machine tools
DE1560973B1 (de) * 1962-09-05 1972-06-29 Colton Lewis Henry Einrichtung zum UEberwachen von Kettenwirkmaschinen mit einem optischen Beobachtungsgeraet
DE1585331A1 (de) * 1965-03-16 1970-05-21 Sick Erwin Fotoelektrische Vorrichtung zur UEberwachung von Strick- oder Wirkmaschinen
GB1281951A (en) * 1969-07-18 1972-07-19 Electronit Ltd Circular knitting machine
FR2298633A2 (fr) * 1975-01-22 1976-08-20 Inst Textile De France Dispositif de d
GB2022150A (en) * 1978-05-31 1979-12-12 Meiners Electronic Controls Lt Improvements in and relating to the detection of flaws, breakages discontinuities and the like

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0392757A1 (de) * 1989-04-08 1990-10-17 Axminster Carpets Limited Fadenwächter
EP1156144A1 (de) * 2000-05-15 2001-11-21 Brintons Limited Einheit zum Bilden von Tuftinggarne und Webmaschine
WO2001088241A1 (en) * 2000-05-15 2001-11-22 Brintons Limited Yarn tuft forming unit and loom
US6820656B2 (en) 2000-05-15 2004-11-23 Brintons Limited Yarn tuft forming unit and loom
JP4851044B2 (ja) * 2000-05-15 2012-01-11 ブリントンズ リミティド 糸タフト形成ユニットおよび織機
BE1017750A3 (nl) * 2006-11-17 2009-06-02 Wiele Michel Van De Nv Inrichting en werkwijze voor het detecteren van niet gesneden pool bij het axminsterweven.
US7831331B1 (en) 2007-06-05 2010-11-09 Cyp Technologies, Llc Apparatus and method for detecting knife position on a tufting machine

Also Published As

Publication number Publication date
EP0058510A3 (de) 1982-10-13
IE52518B1 (en) 1987-11-25
IE820277L (en) 1982-08-12

Similar Documents

Publication Publication Date Title
EP0530492B1 (de) Verfahren zum Feststellen von Fehlern in einer textilen Warenbahn
US5416593A (en) Method for determining a distortion angle in a textile material and an apparatus for use therein
EP0058510A2 (de) Überwachungsanlage und Überwachungsverfahren
GB2093989A (en) A monitor and method of monitoring
US4565224A (en) Apparatus for monitoring weft thread in a weaving machine
DE69633814T2 (de) Vorrichtung und Verfahren zum Aufspüren von Rissen in Papierbahnen während der Druckpressung
US4772800A (en) Method of detecting a broken yarn in a row of line up yarns and apparatus therefor
EP0740639B1 (de) Verfahren und vorrichtung zur erkennung einer fadenaufspulung auf einer rotierenden walze
US4602582A (en) Monitoring looper thread feed monitoring device in a sewing machine
EP0095779B1 (de) Verfahren und Vorrichtung zur Schussgarnüberwachung in Düsenwebmaschinen
US4911207A (en) Method for monitoring warp breaks on weaving machines, and a device which uses this method
DE2705012A1 (de) System zum feststellen des ergreifens eines schussfadens bei schuetzenlosen webmaschinen
KR100268051B1 (ko) 실스캐닝방법및실풀림센서와씨실공급장치
DE3046260C2 (de) Vorrichtung zur automatischen Nahtkontrolle an Doppelkettenstich-Nähmaschinen
EP0392757B1 (de) Fadenwächter
EP0148288A1 (de) Apparat zum Feststellung von Fehlern bei der Herstellung von Kordsamt
DE102004017676B4 (de) Fehlererfassungsvorrichtung einer Rollenrotations-Druckmaschine
GB2096651A (en) Gripper Axminster looms
GB1589152A (en) Detection of faults in tufted fabrics
CN114836881B (zh) 一种无梭织机的断纱检测方法、装置及自动停机系统
GB2068113A (en) Detection of faults in fabrics
GB2240990A (en) Axminster carpet loom
GB2027191A (en) Detection of faults in sheet and like materials
EP0452932B1 (de) Verfahren und Vorrichtung zur Überwachung der Reparatur von gebrochenen Kettfäden
KR930010100B1 (ko) 레피어지기의 위사감지기

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LU NL SE

AK Designated contracting states

Designated state(s): AT BE CH DE FR IT LU NL SE

17P Request for examination filed

Effective date: 19830412

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19851005

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BLAIR, DESMOND MCGAVOCK