EP0115537B1 - Vorrichtung zum aufspüren der garnbrüche einer feinspinnmaschine - Google Patents

Vorrichtung zum aufspüren der garnbrüche einer feinspinnmaschine Download PDF

Info

Publication number
EP0115537B1
EP0115537B1 EP19820902258 EP82902258A EP0115537B1 EP 0115537 B1 EP0115537 B1 EP 0115537B1 EP 19820902258 EP19820902258 EP 19820902258 EP 82902258 A EP82902258 A EP 82902258A EP 0115537 B1 EP0115537 B1 EP 0115537B1
Authority
EP
European Patent Office
Prior art keywords
circuit
detecting
comparator
light
yarn breakage
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
Application number
EP19820902258
Other languages
English (en)
French (fr)
Other versions
EP0115537A4 (de
EP0115537A1 (de
Inventor
Kiyoyasu Handa
Hiroaki Yuzuriha
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.)
AICHI SPINNING CO Ltd
Original Assignee
AICHI SPINNING CO 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 AICHI SPINNING CO Ltd filed Critical AICHI SPINNING CO Ltd
Publication of EP0115537A1 publication Critical patent/EP0115537A1/de
Publication of EP0115537A4 publication Critical patent/EP0115537A4/de
Application granted granted Critical
Publication of EP0115537B1 publication Critical patent/EP0115537B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
    • D01H13/1691—Thread breakage detector means associated with pneumatic cleaning devices, e.g. suction of broken end of yarn

Definitions

  • This invention relates to an apparatus for detecting yarn breakage in a spinning frame, more especially, to apparatus for detecting yarn breakage by detecting fibers floating forward in a pneumatic duct when yarn breakage occurs in the spinning frame.
  • the main method used hitherto to detect yarn breakage in a spinning frame has been to apply light upon the yarn moving between a front roller and a snail wire in the spinning frame and to detect the existence of the yarn in the light by a photocell.
  • Japanese Examined Patent Publication (Kokoku) No. 48-2569 discloses a method in which a detecting device having a photocell is arranged on a moving unit traversing between a plurality of frames of the spinning frames and yarn breakage of a spindle facing the moving unit is detected along with movement of the moving unit.
  • Methods of detecting yarn breakage other than detection of the yarn path by a photocell include detection by sensing the oscillation of the yarn during spinning using a snail wire and, as disclosed in Japanese Examined Patent Publication No. 48-4894, detection of yarn breakage by providing a lever equipped with a snail wire at one end and equipped with a light energy absorbing member at the other end and by absorbing the light flowing along the front of the spinning frame when yarn breakage and loss of support by the snail wire cause the lever to swing and the light energy absorbing member ta move downward.
  • Japanese Examined Patent Publication No. 49-38372 discloses a method arranged a yarn breakage sensing member to travel at the front of the spinning frame or other textile machine at a constant speed and detecting yarn breakage by whether or not yarn contacts the sensing member when the sensing member travels along the frame of the textile machine.
  • These yarn methods for detecting yarn breakage either detect yarn breakage by means of a member contacting a yarn during spinning or detect the same without contacting the yarn but by using a photocell, wherein a moving unit mounted with a detecting device is arranged between frames of the spinning frames.
  • a member contacting the yarn during spinning has the risk of increasing yarn breakage by the yarn breakage detection operation.
  • use of a moving unit makes it possible to detect yarn breakage of only spindles in front of the moving unit. In either case, large equipment costs are required.
  • the technical idea of the apparatus for detecting yarn breakage in accordance with the present invention is to apply a light beam emitted from a light projector at a predetermined position in a pneumatic main duct and, when fibers passing transversely through the light beam exist, to detect light scattered by the fibers as electrical pulse signals by a photo-electrical system and recognize the electrical pulse signals as yarn breakage when successively repeated more than a predetermined instances per unit time.
  • the recognition of the electrical pulses signals is achieved by integrating the pulse signals in unit time and by comparing the integrated value with a predetermined value (voltage).
  • One necessary condition for a practical apparatus is reliability of operation as a detecton device.
  • this type apparatus is whether it can reliably detect the light scattered when floating fibers pass through the pneumatic duct and pass through a detection position of this apparatus, i.e., if the floating fibers occurred due to yarn breakage or not. If it cannot detect this reliably, the apparatus of the present invention would not be practical. From this viewpoint, the apparatus for detecting yarn breakage in accordance with the present invention has a built-in system for checking the reliability of detection.
  • a spinning frame is usually provided with a pneumatic device to suck up and hold fleece generated along with yarn breakage.
  • the pneumatic device is comprised of pneumatic flutes 3 equipped with suction holes corresponding to the spindles of the spinning frame, pneumatic ducts 2 for transporting the air and the fleece from the pneumatic flute, and a case accommodating a pneumatic suction device 1 consisting of a reservoir for holding the fleece transported from the duct and a suction fan.
  • the pneumatic duct 2 is illustrated in Fig. 1 as two uniform-shape ducts.
  • Each pneumatic duct 2 is actually formed with an increasingly large sectional area from the position farthest from the suction fan to the position closest to the suction fan so as to achieve uniform suction in accordance with the amount of air passing in the duct.
  • one pneumatic duct is usually arranged on each side of the spinning frame near to the pneumatic suction device case 1, i.e., a total of two, sometimes the two pneumatic ducts are joined into one just in front of the case 1 for connection with the case 1.
  • the apparatus for detecting yarn breakage in accordance with the present invention is comprised of a detecting unit 10 of the detecting device and a panel box 4 housing electrical circuits.
  • the panel box 4 is provided with lamps for indicating yarn breakage.
  • the detecting unit 10 of the detecting device is arranged on an end portion adjacent to the case 1 of the pneumatic duct 2.
  • the detecting unit 10 is comprised of a light projector 12 and a light collector 16.
  • the light projector 12 and the light collector 16 are fixed on an attaching member 11 of the detecting device after being adjusted in inclined angles so that the focus of the light collector 16 substantially matches the passage of incident light from the light projector.
  • the light projector 12 and the light collector 16 are arranged so that the focus of the incident light from the light projector 12 substantially matches the focus of light collected by the light collector 16.
  • Attachment of the detecting unit 10 to the pneumatic duct 2 is achieved by fixing the attaching member 11 to the pneumatic duct 2 by means of bolts or other suitable means.
  • the light projector 12 has a light source 14 and a projecting lens 13 collecting light emitted from the light source 14.
  • the light source 14 is connected through a lead wire 15 to a power supply 30.
  • the light collector 16 has a light collecting lens 17 collecting light scattered from the fibers reflecting the incident light and has a photocell 18 connected through a lead wire 19 to an electric circuit housed in the panel box 4.
  • the electric circuit is comprised of an amplification circuit 21, a comparator circuit 22, an integration circuit 23, and a comparator circuit 24.
  • a predetermined voltage Vr which acts as a comparative standard is supplied to the comparator circuit 24.
  • the electric circuit will be called an amplification, comparison, and judgement circuit 20 (ACJ circuit 20) hereinafter.
  • an output of the ACJ circuit 20 is connected to an alarm circuit 25 having an alarm R.
  • an alarm indicating lamp arranged on an end of the frame in the spinning frame may be used as the alarm.
  • An alarm indicating lamp is convenient for informing operators at positions far from the spinning frames of the existence of spinning frames with yarn breakage. Further, a blinking type alarm indicating lamp is useful for informing operators of the existence of spinning frames with yarn breakage more speedily. Further, central placement of the alarm indicating lamps of a plurality of spinning frames in a spinning room in a specific place of the spinning room and, thereby, central monitoring of the yarn breakage situation of the spinning frames in the spinning room is useful for discovering speedily frames having yarn breakage and for obtaining an overall grasp of the spinning conditions of all the spinning frames and managing the same.
  • the alarm used may also be a buzzer or a buzzer with an alarm indicating lamp.
  • the sound of a buzzer is effective for informing the operators of the yarn breakage.
  • the apparatus for detecting yarn breakage of the present invention operates as follows.
  • fleece When yarn breaks, fleece is delivered from a draft part corresponding to the yarn breakage spindle. The fleece is sucked from a hole 3 into the pneumatic flute and is sent through the successive larger diameter pneumatic duct toward the case 1 for final accumulation and storage in the pneumatic fleece reservoir (not shown).
  • the fleece passing through the apparatus for detecting yarn breakage which apparatus is, as illustrated in Fig. 1, arranged at a position in the pneumatic main duct adjacent to the pneumatic suction device case 1, is dispersed into a plurality of fibers 40 or fiber groups consisted of a plurality of fibers (called simply “fibers 40" hereinafter) by an air stream passing inside the duct, as illustrated in Fig. 2, and floats forward in the duct.
  • the light projector 12 When light is incidented by the light projector 12 in to the pneumatic main duct, in which the plurality of fibers 40 are irregularly distributed, the light is scattered by the fibers and, viewed in the direction inclined with respect to the direction of the incident light, the passage of the incident light may be seen as flickering.
  • the photocell 18 of the light collector 16, focused toward the passage of the light in the incident light therefore generates a pulse in response to each flicker of the light beam of the incident light due to the scattering of the light beam by the fibers, i.e., due to the Tyndall effect.
  • the frequency of pulse generation is low, as illustrated in the time to, of Fig. 4B.
  • the frequency of pulse generation increases, as illustrated in the time t b of Fig. 4B.
  • the frequency of pulse generation again decreases, as illustrated in the time t 02 of Fig. 4B.
  • the vertical axis represents the intensity (V) of pulse (Voltage) and the horizontal axis represents the time (T).
  • the pulses output from the photocell 18 are supplied through the lead wire 19 to the ACJ circuit 20.
  • the pulses pass through the amplification circuit 21 and the comparator circuit 22 to the integration circuit 23 for integration. Namely, when yarn breaks and numerous fibers 40 float forward in the pneumatic duct, the frequency of pulse generation per unit time is high.
  • the integration of the pulses by unit time thereby results in an increased integrated voltage level in the integration circuit 23. When there is no yarn breakage, no rise is obtained in the integrated voltage level in the integration circuit 23.
  • the output signal of the integration circuit 23 is input to the comparator circuit 24.
  • the predetermined setting voltage Vr which functions as the standard, is supplied to the comparator circuit 24.
  • the output signal from the integration circuit 23 and the setting voltager Vr are compared and, when the voltage level of the output signal is higher than the level of setting voltage Vr, the alarm circuit 25 is activated.
  • the apparatus for detecting yarn breakage of the present application is also characterized by projecting light into the pneumatic duct, receiving light scattered by the fibers floating through the duct by the light collector and converting it into pulse signals, continuously integrating the pulses by unit time to find the integrated value (electric quantity), comparing the integrated value with the standard value predetermined to correspond to control target number of yarn breakages, and, when the integrated value reaches the standard value, indicating this by electric signals.
  • Blocks 21, 22, 23, 24, and 25 illustrated by the chained lines in Fig. 5 correspond to circuit blocks 21, 22, 23, 24, and 25 of Fig. 3.
  • the operation of the circuit in Fig. 5 is described with reference to waveform diagrams in Fig. 6A through Fig. 61.
  • Fig. 6A through Fig. 61 illustrate the waveforms of signals appearing in points A through I in Fig. 5, respectively.
  • Table 1 shows the results of a reliability inspection conducted over four days, i.e., April 27, 28, and 29, 1981, and May 18, 1981.
  • the apparatus of the present invention having the electrical circuit illustrated in Fig. 5 was confirmed to have a very high reliability, i.e., from 95% to 98%.
  • the apparatus of the present invention detects fibers floating in the pneumatic main duct by applying light to the fibers and detecting the light scattered by those fibers and emits an alarm via the above-mentioned electrical circuit. Therefore, there is absolutely no need to touch the yarn during spinning, and yarn breakage can be detected without any influence on the spinning conditions. Further, there is no need to arrange a detecting member on each spindle of the spinning frame or to arrange a moving unit for moving the detecting member in the space between spinning frames. Therefore, the apparatus of the present invention can be made at a lower cost compared with ordinary apparatuses. Furthermore, the apparatus of the present invention can be easily attached to existing spinning frames with a simple remodeling. Thus, the practical effect of the apparatus of the present invention is extremely high.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Claims (5)

1. Vorrichtung zum Feststellen von Garnbrüchen bei Spinnmaschinen mit einem Licht in ein pneumatisches Rohr (2) der Spinnmaschine projizierenden Lichtprojektor (12), einer auf photoelektrischem Wege die Existenz von Fasern im einfallenden Licht anzeigenden Photozelle (18), einem Verstärkerkreis (21) für die von der Photozelle erhaltenen elektrischen Impulssignale, einem Integrationskreis (23), der mit einer voreingestellten Zeitkonstante die von dem Verstärkerkreis erhaltenen, verstärkten elektrischen Impulssignale aufintegriert, einem ersten Vergleichskreis (24), der die aufintegrierte Spannung des Integrationskreises mit einer voreingestellten Standardspannung (Vr) vergleicht und ein einen anormalen Wert anzeigendes Signal abgibt, wenn sich die aufintegrierte Spannung von der Standardspannung (Vr) unterscheidet, und einem Garnbruchalarmkreis (25), der von den einen anormalen Wert anzeigenden Signalen des ersten Vergleichkreises (24) eingeschaltet wird, dadurch gekennzeichnet, daß zwischen dem pneumatischen Rohr und der Lichtquelle eine Projektionslinse (13) sowie zwischen dem pneumatitischen Rohr (2) und der Photozelle eine Lichtsammellinse (17) angeordnet ist, und daß eine Achse der Lichtsammellinse (17) so winklig zur Richtung des einfallenden Lichtes verläuft, daß die Lichtquelle und die Fotozelle auf ungefähr denselben, innerhalb des pneumatischen Rohrs (2) befindlichen rohrwandfernen Punkt fokussiert sind.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein Kondensator (C1) eine Gleichstromkomponente aus dem elektrischen Impulssignal der Photozelle (18) filtert und nur ein Wechselstromanteil auf den Eingang des Verstärkerkreises (21) gelegt wird.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Amplituden der elektrischen lmpulssignale des Verstärkerkreises (21) vereinheitlicht und Störsignale mit niedrigerer Höhe als eine voreingestellte Standardspannung (V1) entfernt werden, indem vor dem Eingang des Integrationskreises (23) ein zweiter Vergleichskreis (22) geschaltet ist, der die elektrischen Impulssignale als erste Eingangsgröße und die voreingestellte Standardspannung als zweite Eingangsgröße erhält.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß sich der erste Vergleichskreis (24) seinerseits aus einem ersten Vergleichskreis, einem zweiten Vergleichkreis und einem Flip-Flop, das die Ausgangsgrößen des ersten Vergleichskreises und des zweiten Vergleichskreises als Setz- bzw. Rücksetzimpuls benutzt, zusammensetzt, und daß an den jeweils ersten Eingängen des ersten und des zweiten Vergleichskreises die Ausgangsspannung des Integrationskreises und an den jeweils zweiten Eingängen zwei voreingestellte Standardspannungen (Vrl, Vr2) als unterer und oberer Grenzwert anliegen.
5. Vorrichtung zum Feststellen von Garnbrüchen bei Spinnmaschinen mit einer Photozelle (18), die auf photoelektrischem Wege Streulicht wahrnimmt und elektrische Impulssignale abgibt, wobei das Streulicht von Fasern herrührt, die durch von einer Projektionslinse (13) in ein pneumatisches Rohr (2) einer Spinnmaschine projiziertes, einfallendes Licht schweben, einer Lichtsammellinse (17) zwischen dem pneumatischen Rohr und der Photozelle, einem Verstärkungskreis (21), der die von der Photozelle empfangenen elektrischen Impulssignale verstärkt, einem Integrationskreis (23), der mit einer voreingestellten Zeitkonstante die von dem Verstärkungskreis empfangenen, verstärkten elektrischen Impulssignale aufintegriert, einem ersten Vergleichskreis (24), der die aufintegrierte Spannung des Integrationskreises mit einer voreingestellten Standardspannung (Vr) vergleicht und ein einen anormalen Wert anzeigendes Signal abgibt, wenn die aufintegrierte Spannung über der Standardspannung liegt, einem Garnbruchalarmkreis (25), der von den einen anormalen Wert anzeigenden Signalen, die von dem ersten Vergleichskreis geliefert werden, eingeschaltet wird, und einem zweiten, vor dem Eingang des Integrationskreises angeordneten Vergleichskreis (22), der die verstärkten elektrischen Impulssignale als erste Eingangsgröße und eine voreingestellte Standardspannung (V1) als zweite Eingangsgröße erhält, um die Amplituden des verstärkten elektrischen Impulssignales zu vereinheitlichen und um Störsignale mit niedrigerer Höhe als die voreingestellte Standardspannung zu entfernen, dadurch gekennzeichnet, daß ein zusätzlicher Schaltkreis (26) Unregelmäßigkeiten anzeigt und einen Kondensator (C3), der fortlaufend von der Ausgangsspannung des zweiten Vergleichskreises geladen wird, einen Entladewiderstand (Rs), der zu dem Kondensator parallel geschaltet ist, und einen dritten Vergleichsschaltkreis (26-1), der die an dem Kondensator anliegende Spannung als erste Eingangsgröße und eine eingestellte untere Grenzspannung (Vr3) als zweite Eingangsgröße erhält, aufweist, und daß der zusätzliche Schaltkreis das Auftreten von Unregelmäßigkeiten in dem gesamten Schaltkreis zum Aufspüren von Garnbrüchen mit Hilfe des dritten Vergleichskreises aufspürt, indem die Ladespannung des Kondensators unter die untere Grenzspannung fällt, und daß der Lichtprojektor (12) und die Photozelle auf denselben, innerhalb des pneumatischen Rohrs liegenden, rohrwandfernen Punkt fokussiert sind.
EP19820902258 1982-07-29 1982-07-29 Vorrichtung zum aufspüren der garnbrüche einer feinspinnmaschine Expired EP0115537B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1982/000294 WO1984000567A1 (en) 1982-07-29 1982-07-29 Method and device for detecting end breakage of fine spinning frame

Publications (3)

Publication Number Publication Date
EP0115537A1 EP0115537A1 (de) 1984-08-15
EP0115537A4 EP0115537A4 (de) 1984-11-07
EP0115537B1 true EP0115537B1 (de) 1988-04-27

Family

ID=13762312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820902258 Expired EP0115537B1 (de) 1982-07-29 1982-07-29 Vorrichtung zum aufspüren der garnbrüche einer feinspinnmaschine

Country Status (3)

Country Link
EP (1) EP0115537B1 (de)
DE (1) DE3278407D1 (de)
WO (1) WO1984000567A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570091B1 (fr) * 1984-09-13 1987-03-20 Neu Ets Procede et dispositif de commande d'une installation de recuperation de dechets textiles
DE102014018628A1 (de) 2014-12-13 2016-06-16 Saurer Germany Gmbh & Co. Kg Vielstellentextilmaschine
CN114016172B (zh) * 2021-11-05 2023-07-14 宜昌拓数科技有限公司 用于超细纤维的捻线机断纱检测装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780908A (en) * 1952-04-10 1957-02-12 Pneumafil Corp Control systems for spinning and roving frames
CH492808A (de) * 1968-08-02 1970-06-30 Parks Cramer Co Textilmaschine
CH515177A (de) * 1970-12-17 1971-11-15 Schlafhorst & Co W Verfahren und Vorrichtung zur lichtelektrischen Überwachung dynamischer Vorgänge, insbesondere zur Überwachung mindestens eines Fadens in einer Textilmaschine
JPS5285528A (en) * 1975-12-31 1977-07-15 Shikibo Ltd Arrangement for monitoring end breakages of spinning frames
CH618476A5 (de) * 1977-06-09 1980-07-31 Luwa Ag
FR2466747A1 (fr) * 1979-10-01 1981-04-10 Inst Textile De France Procede et installation de controle du diametre d'un fil ou cable
JPS5777328A (en) * 1980-10-27 1982-05-14 Daiwa Spinning Co Ltd Sensing method for number of yarn breakage in spinning frame

Also Published As

Publication number Publication date
EP0115537A4 (de) 1984-11-07
DE3278407D1 (en) 1988-06-01
EP0115537A1 (de) 1984-08-15
WO1984000567A1 (en) 1984-02-16

Similar Documents

Publication Publication Date Title
US10412880B2 (en) Seed sensor with lightpipe photodetect assembly
US3530690A (en) Yarn inspection apparatus
US7414703B2 (en) Scattered light range of view measurement apparatus
US2967947A (en) Sheet inspection method and apparatus
US10078948B2 (en) Smoke detector with a double optical chamber
JPH0755692A (ja) 粒子検出装置
US6650959B1 (en) Method and apparatus for the detection of foreign materials in moving textile materials
EP0115537B1 (de) Vorrichtung zum aufspüren der garnbrüche einer feinspinnmaschine
US11119051B2 (en) Particle detection for substrate processing
US3174046A (en) Photodynamic monitor for inspecting spun yarns
JPS5988950A (ja) よこ糸監視装置
EP0642607B1 (de) Vorrichtung zur ununterbrochenen überwachung der nadeln einer strickmaschine während ihres betriebs
US3628030A (en) Broken end detection system for warpers utilizing novel optical system
US3041461A (en) Photo electric inspecting apparatus
US3044345A (en) Electronic inspection apparatus for textile threads
CN101470076A (zh) 对纵向运动纤维束的质量进行光学评价的方法与装置
CN2193365Y (zh) 一种光电清纱传感器
JP2011149706A (ja) 粉末検出装置
US5705817A (en) Apparatus for optical monitoring of a thread for irregularities
CN207467597U (zh) 一种电容器芯包计数装置
US5436719A (en) Fiber optic flaw detector system and calibration apparatus
US3803822A (en) Radiation sensitive ends down detecting apparatus and method
EP0556987A1 (de) System zur Erkennung von Beschichtungsfehlern auf Grund von Lichtstreuung ausserhalb des erwarteten Bereichs
SU1211195A1 (ru) Нитенаблюдатель текстильной машины
JPS638538A (ja) 煙感知器

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB LI

17P Request for examination filed

Effective date: 19840807

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB LI

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19880427

Ref country code: FR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19880427

Ref country code: CH

Effective date: 19880427

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19880601

REF Corresponds to:

Ref document number: 3278407

Country of ref document: DE

Date of ref document: 19880601

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19880729

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EN Fr: translation not filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

GBPC Gb: european patent ceased through non-payment of renewal fee
26N No opposition filed