DD294678A5 - ARRANGEMENT FOR NON-CONTACT SURVEILLANCE OF A THREAD-MATERIAL MATERIAL - Google Patents
ARRANGEMENT FOR NON-CONTACT SURVEILLANCE OF A THREAD-MATERIAL MATERIAL Download PDFInfo
- Publication number
- DD294678A5 DD294678A5 DD90341080A DD34108090A DD294678A5 DD 294678 A5 DD294678 A5 DD 294678A5 DD 90341080 A DD90341080 A DD 90341080A DD 34108090 A DD34108090 A DD 34108090A DD 294678 A5 DD294678 A5 DD 294678A5
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- ultrasonic
- arrangement
- transmitter
- receiver
- thread
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000011156 evaluation Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012854 evaluation process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/36—Textiles
- G01N33/365—Filiform textiles, e.g. yarns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
- B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
- B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
- B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
- B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
- B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
-
- 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
- D01H13/1616—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 characterised by the detector
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Textile Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Acoustics & Sound (AREA)
- Quality & Reliability (AREA)
- Treatment Of Fiber Materials (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Controlling Sheets Or Webs (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Die Erfindung betrifft die beruehrungslose Einzelueberwachung fadenfoermiger Materialien wie Faeden, Garne, Lunten, Faserbaender u. ae. Es ist Ziel der Erfindung, Effektivitaetseinbuszen infolge nicht erkannter Stoerungen bei der Bearbeitung fadenfoermiger Materialien weitestgehend zu vermeiden. Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung zur beruehrungslosen Einzelueberwachung fadenfoermiger Materialien zu schaffen, deren Funktionssicherheit nicht durch Umwelteinfluesse beeintraechtigt wird. Diese Aufgabe wird erfindungsgemaesz durch eine Anordnung geloest, deren Sender als Ultraschallsender und deren Empfaenger als Ultraschallempfaenger ausgebildet ist. Figur{Einzelueberwachung; fadenfoermiges Material; beruehrungslos; Funktionssicherheit; Ultraschallsender; Ultraschallempfaenger}The invention relates to the contactless individual monitoring filamentous materials such as Faeden, yarns, Lunten, Faserbaender u. ae. It is an object of the invention, Effektivitaetseinbuszen as a result of unrecognized disturbances in the processing of filamentous materials as far as possible to avoid. The invention has for its object to provide an arrangement for contactless individual monitoring filamentous materials whose reliability is not affected by environmental influences. This object is achieved according to the invention by an arrangement whose transmitter is designed as an ultrasonic transmitter and whose receiver is designed as an ultrasonic receiver. FIG {Einzelueberwachung; thread-like material; non-contact; Reliability; Ultrasonic transmitter; Ultraschallempfaenger}
Description
Hierzu 1 Seite ZeichnungFor this 1 page drawing
Anwendungsgebiet der ErfindungField of application of the invention
Die Erfindung betrifft die berührungslose Einzelüberwachung fadenförmiger Materialien wie Fäden, Garne, Lunten, Faserbänder u.a.The invention relates to the non-contact individual monitoring filamentous materials such as threads, yarns, slivers, slivers u.a.
Charakteristik des bekannten Standes der TechnikCharacteristic of the known state of the art
Anordnungen zur Überwachung fadenförmiger Materialien sind in großer Anzahl und Vielfalt bekannt. Neben einer Reihe von Anordnungen, die eine Abtastung dieses Materials mit einem mechanischen Fühler realisieren und damit insbesondere bei empfindlichen Materialien deren freie Beweglichkeit und u.U. auch deren Qualität negativ beeinflussen, gibt es eine Vielzahl berührungslos arbeitender Anordnungen. Diese beruhen u.a. auf kapazitivem oder optoelektronischem Prinzip. Sie sind jedochArrangements for monitoring filamentous materials are known in large numbers and variety. In addition to a number of arrangements that realize a scan of this material with a mechanical probe and thus especially in sensitive materials whose free mobility and u.U. There is also a large number of non-contact arrangements. These are based i.a. on capacitive or optoelectronic principle. They are, however
meist sehr empfindlich gegen Umwelteinflüsse, die das Überwachungsergebnis verfälschen können. Solche Einflüsse sind u.a.usually very sensitive to environmental influences that can falsify the monitoring result. Such influences are i.a.
Verschmutzung, Luftfeuchte, Fremdlichtbeeinflussung, Farbänderungen.Pollution, air humidity, extraneous light influence, color changes.
Derartige Überwachungsanordnungen haben in der Regel als Grundelemente einen Sender und einen im Abstand zu diesem angeordneten Empfänger, zwischen denen sich das zu überwachende Material befindet bzw. bewegt.As a rule, such monitoring arrangements have as a basic element a transmitter and a receiver arranged at a distance therefrom, between which the material to be monitored is located or moved.
Dieser Sender-Empfänger-Kombination ist eine Auswerteschaltung nachgeordnet, die das empfangene Signal in notwendige Reaktionen umsetzt.This transmitter-receiver combination is followed by an evaluation circuit, which converts the received signal into necessary reactions.
Ein Beispiel hierfür ist die Vorrichtung gemäß der DE-OS 2123641, die auf optoelektronischer Basis arbeitet.An example of this is the device according to DE-OS 2123641, which operates on an optoelectronic basis.
Auch auf sie treffen die genannten Nachteile zu.Also to meet the disadvantages mentioned.
Diese Nachteile führen jedoch im Endeffekt dazu, daß Störungen im Prozeß der Bearbeitung des zu überwachenden Materials nicht erkannt werden und erhebliche Schäden durch Unterbrechungen der Produktion hervorrufen. Damit verbunden ist eir .However, these drawbacks ultimately result in failures in the process of processing the material to be monitored not being detected and causing significant damage due to production interruptions. Connected with this is eir.
Verringerung der ökonomischen Effektivität der Textilmaschine.Reduction of the economic efficiency of the textile machine.
Ziel der ErfindungObject of the invention
Es ist Ziel der Erfindung, Effektivitätseinbußen infolge nicht erkannter Störungen bei der Bearbeitung fadenförmiger Materialien weitestgehend zu vermeiden.It is an object of the invention to avoid effectiveness losses as a result of unrecognized disturbances in the processing of filamentary materials as far as possible.
Darlegung des Wesens der ErfindungExplanation of the essence of the invention
Der Erfindung liegt die Aufgabe zugrunde, eine Anordnung zur berührungslosen Einzelüberwachung fadenförmiger Materialien zu schaffen, deren Funktionssicherheit nicht durch Umwelteinflüsse beeinträchtigt wird.The invention has for its object to provide an arrangement for non-contact individual monitoring filamentous materials whose reliability is not affected by environmental influences.
Diese Aufgabe wird erfindungsgemäß durch eine Anordnung gelöst, deren Sender als Ultraschallsender und deren Empfänger als Ultraschallempfänger ausgebildet ist.This object is achieved by an arrangement whose transmitter is designed as an ultrasonic transmitter and its receiver as an ultrasonic receiver.
Weitere wesentliche Merkmale der Erfindung enthalten die Patentansprüche 2 und 3.Further essential features of the invention include the claims 2 and 3.
Die erfindungsgemäße Anordnung ist gegen Verschmutzung unempfindlich. Frei im Spalt zwischen Ultraschallsender und Ultraschallempfänger schwebende Staubteilchen haben ebenfalls keinen Einfluß, da sie infolge ihrer geringen Masse mitschwingen und die Ultraschallwellen nicht spürbar dämpfen.The arrangement according to the invention is insensitive to contamination. Dust particles floating freely in the gap between the ultrasonic transmitter and the ultrasonic receiver likewise have no influence, since they resonate due to their low mass and do not noticeably dampen the ultrasonic waves.
Eine meßbare Dämpfung tritt lediglich durch das zu überwachende Material ein, so daß die Auswerteeinheit eindeutig auf das Vorhandensein oder Fehlen dieses Materials im Überwachungsbereich schließen und gegebenenfalls notwendige Schaltvorgänge bzw. Reaktionen auslösen kann.A measurable damping only occurs through the material to be monitored, so that the evaluation unit can clearly conclude the presence or absence of this material in the monitoring area and, if necessary, trigger necessary switching operations or reactions.
Akustische Umwelteinflüsse, z.B. Maschinengeräusche, könnten allenfalls dann Einfluß haben, wenn sie im Ultraschallbereich' lägen. Die Anordnung des Selektivverstärkers vor der Auswerteeinheit verhindert dies jedoch weitestgehend.Acoustic environmental influences, e.g. Machine noises could possibly have an effect if they were in the ultrasonic range. However, the arrangement of the selective amplifier before the evaluation prevents this as far as possible.
Die Erfindung soll nachfolgend anhand eines Ausf Uhrungsbeispioles näher erläutert werden. Die beigefügte Zeichnung zeigt ein Blockschaltbild einer erfindungsgemäßen Anordnung.The invention will be explained in more detail with reference to a Ausfungsbeispioles. The attached drawing shows a block diagram of an arrangement according to the invention.
Als wesentliche Elemente enthält die Anordnung einen Ultraschallsender 1 und einen Ultraschallempfänger 2. Zwischen diesen wird das fadenförmige Material 3 geführt. Der Ultraschallsender 1 ist mit einem Oszillator 4 gekoppelt, der die Ultraschallschwingungen erzeugt. Dem Ultraschallempfänger 2 nachgeschaltet sind ein Selektivverstärker 5 und eine Auswerteeinheit 6.As essential elements, the arrangement includes an ultrasonic transmitter 1 and an ultrasonic receiver 2. Between these, the filamentary material 3 is guided. The ultrasonic transmitter 1 is coupled to an oscillator 4 which generates the ultrasonic vibrations. Downstream of the ultrasonic receiver 2 are a selective amplifier 5 and an evaluation unit 6.
Der Abstand a, in welchem Ultraschallsender 1 und Ultraschallempfänger 2 voneinander entfernt sind, ist abhängig von der Wellenlänge λ der vom Oszillator 4 erzeugten Ultraschallschwingung. Der Abstand a soll ein Vielfaches von λ betragen. Durch die gegenüberliegende Anordnung von Ultraschallsender 1 und Ultraschallempfänger 2 bilden sich stehende Wellen aus, die bekannterweise Schwingungsmaxima und -minima aufweisen. Die Bewegungsbahn des fadenförmigen Materials 3 wird so gelegt, daß sie durch ein Schwingungsmaximum verläuft,The distance a in which the ultrasonic transmitter 1 and the ultrasonic receiver 2 are remote from one another depends on the wavelength λ of the ultrasonic vibration generated by the oscillator 4. The distance a should be a multiple of λ. Due to the opposite arrangement of the ultrasonic transmitter 1 and the ultrasonic receiver 2, standing waves are formed which, as is known, have oscillation maxima and minima. The trajectory of the filamentary material 3 is placed so that it passes through a maximum vibration,
Während des Betriebes der erfindungsgemäßen Anordnung werden die vom Ultraschallsender 1 ausgesendeten und vom Ultraschallempfängor 2 aufgenommenen Ultraschallwellen durch das zu überwachende fadenförmige Material 3 gedämpft. Das vom Ultraschallempfänger 2 in ein elektrisches Signal umgewandelte Schollsignal wird zunächst mit Hilfe des Selektivverstärkers 5 auf eine der Sendefrequenz des Ultraschallsenders 1 entsprechende Bandbreite begrenzt.During operation of the arrangement according to the invention, the ultrasonic waves emitted by the ultrasonic transmitter 1 and picked up by the ultrasonic receiver 2 are attenuated by the filamentary material 3 to be monitored. The transient signal converted by the ultrasound receiver 2 into an electrical signal is first limited to a bandwidth corresponding to the transmission frequency of the ultrasound transmitter 1 with the aid of the selective amplifier 5.
Die Auswerteeinheit fi, die nicht näher dargestellt ist, da dem Fachmann hierfür genügend Kenntnisse zur Verfügung stehen, vergleicht dieses Signal mit dem Signal, das ohne Vorhandensein des fadenförmigen Materials 3 entsteht. In hinreichend bekannter Weise wird das Ergebnis dieses Auswertevorganges zur entsprechenden Beeinflussung c'er die erfindungsgemäße Anordnung enthaltenden Textilmaschine ausgenutzt.The evaluation unit fi, which is not shown in more detail, because the skilled person for this sufficient knowledge available, compares this signal with the signal that arises without the presence of the filamentary material 3. In a well-known manner, the result of this evaluation process is utilized for the corresponding influencing of the textile machine containing the arrangement according to the invention.
Claims (3)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD90341080A DD294678A5 (en) | 1990-05-29 | 1990-05-29 | ARRANGEMENT FOR NON-CONTACT SURVEILLANCE OF A THREAD-MATERIAL MATERIAL |
| DE4034333A DE4034333A1 (en) | 1990-05-29 | 1990-10-29 | Contactless monitor for yarn, etc. - has ultrasonic transmitter and receiver flanking material at gap from it for monitoring without being affected by local environment |
| JP2325099A JPH0432464A (en) | 1990-05-29 | 1990-11-27 | Noncontact separate monitoring device for thread-like material |
| FR9015204A FR2662679A1 (en) | 1990-05-29 | 1990-12-05 | DEVICE FOR NON-CONTACT INDIVIDUAL MONITORING OF WIRE-FORMED MATERIAL. |
| ITRM910351A IT1247380B (en) | 1990-05-29 | 1991-05-23 | PROVISION FOR SINGLE SURVEILLANCE FREE OF CONTACT OF A FILIFORM MATERIAL |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD90341080A DD294678A5 (en) | 1990-05-29 | 1990-05-29 | ARRANGEMENT FOR NON-CONTACT SURVEILLANCE OF A THREAD-MATERIAL MATERIAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DD294678A5 true DD294678A5 (en) | 1991-10-10 |
Family
ID=5618782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DD90341080A DD294678A5 (en) | 1990-05-29 | 1990-05-29 | ARRANGEMENT FOR NON-CONTACT SURVEILLANCE OF A THREAD-MATERIAL MATERIAL |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPH0432464A (en) |
| DD (1) | DD294678A5 (en) |
| DE (1) | DE4034333A1 (en) |
| FR (1) | FR2662679A1 (en) |
| IT (1) | IT1247380B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4332347A1 (en) * | 1993-09-23 | 1995-03-30 | Siegfried Hillenbrand | Device for monitoring thread, especially in textile technology |
| WO1999012102A1 (en) | 1997-09-05 | 1999-03-11 | Sun Microsystems, Inc. | A multiprocessing system including cluster optimization mechanisms |
| US7103440B2 (en) | 2001-12-11 | 2006-09-05 | Rieter Ingolstadt Spinnereimaschinenbau Ag | Use of microwaves for sensors in the spinning industry |
| DE10214955B9 (en) | 2002-04-04 | 2017-06-29 | Rieter Ingolstadt Gmbh | Spinning preparation machine |
| JP4863993B2 (en) * | 2005-05-31 | 2012-01-25 | 日本碍子株式会社 | Object passage detection device |
| CN112978485B (en) * | 2021-03-16 | 2022-07-22 | 国家电网有限公司 | Cable fault detection device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH515487A (en) * | 1970-06-16 | 1971-11-15 | Zellweger Uster Ag | Method and device for determining the cross-section of products in the textile industry, in particular that of yarns, rovings and ribbons |
| FR2161471A5 (en) * | 1971-11-24 | 1973-07-06 | Crouzet Sa | Static yarn detector - using ultrasonic transducers |
| CH543075A (en) * | 1972-03-15 | 1973-10-15 | Zellweger Uster Ag | Method and device for at least approximate determination of the cross-sectional size of thread-like or wire-like material, in particular of products of the textile industry and wire manufacture |
| CH666125A5 (en) * | 1984-10-26 | 1988-06-30 | Zellweger Uster Ag | METHOD AND DEVICE FOR AT LEAST APPROXIMATELY DETERMINING THE CROSS-SECTION OF LONG-EXTENDED TEST MATERIAL. |
| JPS62140980A (en) * | 1985-12-16 | 1987-06-24 | Showa Electric Wire & Cable Co Ltd | Taping detection method for cable |
-
1990
- 1990-05-29 DD DD90341080A patent/DD294678A5/en not_active IP Right Cessation
- 1990-10-29 DE DE4034333A patent/DE4034333A1/en not_active Ceased
- 1990-11-27 JP JP2325099A patent/JPH0432464A/en active Pending
- 1990-12-05 FR FR9015204A patent/FR2662679A1/en active Pending
-
1991
- 1991-05-23 IT ITRM910351A patent/IT1247380B/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| IT1247380B (en) | 1994-12-12 |
| ITRM910351A0 (en) | 1991-05-23 |
| ITRM910351A1 (en) | 1992-11-23 |
| FR2662679A1 (en) | 1991-12-06 |
| DE4034333A1 (en) | 1991-12-05 |
| JPH0432464A (en) | 1992-02-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2015295C2 (en) | Monitoring system to determine the presence of an object | |
| DE2431999C3 (en) | Breakage detector | |
| DE3045581A1 (en) | DEVICE FOR MEASURING THE SPEED OF SPREADING FROM A MOVING MATERIAL, IN PARTICULAR PAPER, THROUGH ULTRASOUND WAVES | |
| EP0045942B1 (en) | Apparatus for detecting machine tool wear | |
| EP0060392B1 (en) | Coin testing apparatus | |
| DE2260352C2 (en) | Device for detecting damage to glass panes or the like | |
| DD207837A5 (en) | PROCESS AND DEVICE FOR DISTINCTING BETWEEN SOILS ON THE GROUND, ON THE ONE HAND, AND STONES OR GROUND BUTTONS OTHERWISE | |
| DD294678A5 (en) | ARRANGEMENT FOR NON-CONTACT SURVEILLANCE OF A THREAD-MATERIAL MATERIAL | |
| DE2147641A1 (en) | Method and device for determining cracks in bodies | |
| DE2939554A1 (en) | HUMIDITY PROFILE MEASURING ARRANGEMENT WITH MICROWAVES | |
| EP0182960B1 (en) | Device for the determination of the cross section of long straggling formed bodies at least by approximation | |
| DE19847548A1 (en) | Arrangement for securing the rear or side region of a motor vehicle | |
| DE2617119C3 (en) | Electronic thread run guard | |
| CH652874A5 (en) | OPTICAL PROXIMITY SWITCH. | |
| EP3396404B1 (en) | Method for locating objects | |
| DE2529589A1 (en) | SIGNAL DETECTOR CIRCUIT | |
| DE2651042A1 (en) | IDENTIFICATION SYSTEM | |
| DE2953405C2 (en) | ||
| DE3027283C2 (en) | ||
| DE4429689A1 (en) | Test arrangements and methods for checking documents in processing machines | |
| DE1917855B2 (en) | Device for non-destructive testing of materials using the eddy current method | |
| DE2116782B2 (en) | Method and device for determining the volume per unit length of thread-like products in the textile industry | |
| DE19634004A1 (en) | Electronic goods monitor detecting presence of indicator | |
| DE2849411A1 (en) | METHOD AND DEVICE FOR MARKING AND DETECTING THE POSITION OF AN OBJECT | |
| EP0303084A2 (en) | Method and device for measuring objects on a conveyor section |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ENJ | Ceased due to non-payment of renewal fee |