CH652108A5 - METHOD AND DEVICE FOR HUMBLE VOLTAGE SUPPRESSION IN AN ELECTROSTATICALLY ACTING THREAD ROLL MONITOR. - Google Patents
METHOD AND DEVICE FOR HUMBLE VOLTAGE SUPPRESSION IN AN ELECTROSTATICALLY ACTING THREAD ROLL MONITOR. Download PDFInfo
- Publication number
- CH652108A5 CH652108A5 CH594781A CH594781A CH652108A5 CH 652108 A5 CH652108 A5 CH 652108A5 CH 594781 A CH594781 A CH 594781A CH 594781 A CH594781 A CH 594781A CH 652108 A5 CH652108 A5 CH 652108A5
- Authority
- CH
- Switzerland
- Prior art keywords
- voltage
- stage
- sample
- thread
- signal
- Prior art date
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Classifications
-
- 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
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- 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)
- Quality & Reliability (AREA)
- Noise Elimination (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
- Geophysics And Detection Of Objects (AREA)
- Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Description
Die vorliegende Erfindung bringt die erwarteten Verbesserungen und zeichnet sich durch die in den unabhängigen Ansprüchen 1 und 2 ausgedrückten Merkmale aus. The present invention brings the expected improvements and is characterized by the features expressed in independent claims 1 and 2.
Die Erfindung eignet sich sowohl für Messorgane, die mit berührungslosen Signalaufnehmern ausgerüstet sind, als auch für solche, bei denen das Messignal durch Berührung des Fadens mit dem Signalaufnehmer gewonnen wird. The invention is suitable both for measuring elements which are equipped with contactless signal pickups and for those in which the measurement signal is obtained by touching the thread with the signal pickup.
Anhand der Beschreibung und der Figuren wird die Erfindung näher erläutert. Dabei zeigt The invention is explained in more detail with the aid of the description and the figures. It shows
Fig. 1 den in einem Fadenlaufwächter benötigten Signalpfad; 1 shows the signal path required in a thread monitor.
Fig. 2 als Blockschema die prinzipielle Auslegung des Fadenlaufwächters mit Brumspannungsunterdrückung; Fig. 2 as a block diagram, the basic design of the thread monitor with ripple voltage suppression;
Fig. 3a-c graphische Darstellungen von Eingangs- und Ausgangssignalen. 3a-c graphical representations of input and output signals.
Der in Fig. 1 schematisch gezeigte Fadenlaufwächter enthält eine Eingangsstufe 13, in der ein Faden 10 an einer Elektrode 11 vorbeibewegt wird. Die auf dem Faden 10 ■— der beispielsweise ein Chemiefaserkabel mit antistatischer Behandlung sein kann — stochastisch verteilten elektrostatischen Ladungen erzeugen auf der Elektrode 11 durch Influenzwirkung eine Signalspannung Us, die ihrem Verlauf nach auch als Rauschspannung bezeichnet werden kann. The thread guide shown schematically in FIG. 1 contains an input stage 13 in which a thread 10 is moved past an electrode 11. The stochastically distributed electrostatic charges on the thread 10 - which can be, for example, a synthetic fiber cable with antistatic treatment - generate a signal voltage Us on the electrode 11 through the influence of influence, which course can also be referred to as noise voltage.
Auf der Elektrode 11 entsteht im gestörten Fall zusätzlich zum rauschartigen Nutzsignal Us eine Brummspannung UB, entweder über den als Antenne wirkenden Faden 10, odre durch direkte Einstreuung aus der Umgebung. Die durch Influenz oder Einstreuung an der Elektrode 11 auftretenden Spannungen gelangen an einen Verstärker 12 und verlassen diesen als verstärktes Mischsignal UM. Da die Signalspannung Us bei empfindlichen Systemen amplituden-mässig in der gleichen Grössenordnung oder aber auch wesentlich kleiner als die Brummspannung UB sein kann, In the event of a fault, in addition to the noise-like useful signal Us, a ripple voltage UB arises on the electrode 11, either via the thread 10 acting as an antenna, or by direct interference from the surroundings. The voltages occurring at the electrode 11 due to influence or scattering reach an amplifier 12 and leave it as an amplified mixed signal UM. Since the signal voltage Us in sensitive systems can be of the same order of magnitude in terms of amplitude or else significantly smaller than the ripple voltage UB,
muss die Wirkung dieser Brummspannung unterdrückt werden, wenn aufgrund der Signalspannung Us ein Kriterium darüber gefällt werden soll, ob der Faden 10 läuft oder ob er stillsteht bzw. gar nicht vorhanden ist. The effect of this hum voltage must be suppressed if, based on the signal voltage Us, a criterion is to be met as to whether the thread 10 is running or whether it is at a standstill or not at all.
Zu diesem Zweck wird das verstärkte Mischsignal UM einer «sample + hold» — Schaltstufe 10 zugeführt, die mit dem Ausgang einer von der Netzfrequenz synchron ange-stossenen Schaltstufc 16 angesteuert wird. Am Ausgang der «sample + hold» — Schaltstufe 15 erzeugt die Brummspannungskomponente UB des Mischsignals UM eine Gleichspannung, die rauschartige Signalspannung Us infolge ihres mit der Brummspannung unkorrelierten Charakters hingegen eine treppenförmig verlaufende Wechselspannung. Der Effektivwert dieser Wechselspannung ist annähernd proportional zum Effektivwert der Signalspannung Us, obwohl der zeitliche Verlauf der Momentanwerte dieser beiden Spannungen infolge der «sample + hold» — Funktion markant verschieden ist. Die in eine Gleichspannung transformierte Brummstörung kann sich im Gegensatz zur treppenför-migen Wechselspannung nicht über den Hochpass 19 fortpflanzen. Damit ist die Wirkung von Brummeinstreuungen vollständig unterdrückt. For this purpose, the amplified mixed signal UM is fed to a “sample + hold” switching stage 10, which is controlled with the output of a switching stage 16 triggered synchronously by the mains frequency. At the output of the “sample + hold” switching stage 15, the ripple voltage component UB of the mixed signal UM generates a DC voltage, while the noise-like signal voltage Us, owing to its character uncorrelated with the ripple voltage, produces an AC voltage that extends in steps. The RMS value of this AC voltage is approximately proportional to the RMS value of the signal voltage Us, although the temporal course of the instantaneous values of these two voltages is markedly different due to the “sample + hold” function. In contrast to the stair-shaped AC voltage, the hum disturbance transformed into a DC voltage cannot propagate via the high pass 19. This completely suppresses the effects of hum interference.
Fig. 2 zeigt ein mehr detailliertes Schema einer möglichen Ausführung eines Fadenlaufwächters mit Brummunterdrückung. Die vom Faden 10 beeinflusste Eingangsstufe 13 gibt das verstärkte Mischsignal UM vom Verstärker 12 an Fig. 2 shows a more detailed diagram of a possible embodiment of a thread monitor with hum suppression. The input stage 13 influenced by the thread 10 indicates the amplified mixed signal UM from the amplifier 12
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652108 652108
den Abtast-Eingang 151 der «sample +hold» — Schaltstufe 15. Von. der Gleichrichterstufe 17, die für die Stromversorgung des Fadenwächters eingesetzt ist, wird eine gegen Masse unsymmetrische Teilspannung mit Netzfrequenz und allfälligen Oberwellen derart an einen monostabilen Multi-vibrator 18 gelegt, dass dieser im Takt der Netzfrequenz kurze rechteckförmige Impulse an den Steuereingang 152 der «sample 4- hold» — Schaltstufe 15 abgibt. In dieser «sample + hold» — Schaltstufe wird das vom Fadenlauf hervorgerufene rauschartige Signal Us synchron mit der Netzfrequenz abgetastet, der jeweilige Abtastwert bis zum Eintreffen des nächsten Abtastwertes gespeichert, und ein Ausgangssignal 153 erzeugt, das sich durch einen «treppen-förmigen» Verlauf UA auszeichnet. the scanning input 151 of the “sample + hold” switching stage 15. Von. of the rectifier stage 17, which is used for the power supply of the thread monitor, a partial voltage which is asymmetrical with respect to ground, with the mains frequency and any harmonics, is applied to a monostable multi-vibrator 18 in such a way that it pulses short rectangular pulses to the control input 152 of the «sample 4- hold »- switching stage 15 outputs. In this “sample + hold” switching stage, the noise-like signal Us caused by the thread run is sampled synchronously with the mains frequency, the respective sample value is stored until the next sample value arrives, and an output signal 153 is generated which is a “staircase-shaped” curve UA distinguished.
In Fig. 3 sind noch zur Verdeutlichung drei Signaldiagramme dargestelt. a) bedeutet das Mischsignal UM am Abtast-Eingang 151 der «sample + hold» — Schaltstufe 15, b) das Schaltsignal am Steuereingang 152 der «sample + hold» — Schaltstufe, während c) das Ausgangssignal UA s darstellt. 3 shows three signal diagrams for clarification. a) means the mixed signal UM at the scanning input 151 of the “sample + hold” switching stage 15, b) the switching signal at the control input 152 of the “sample + hold” switching stage, while c) represents the output signal UA s.
Das erfindungsgemässe Verfahren bietet gegenüber bereits bekannten Massnahmen erhebliche Vorteile, nämlich die vollständige Eliminierung der Wirkung von eingestreutem Brumm (inklusive Oberwellen), ferner entfallen alle io Probleme mit Präzision und Stabilität von Filterkomponenten; die Vorrichtung ist ohne Umschaltungen oder andere Anpassungen für 50 Hz und 60 Hz einsetzbar, und ausserdem kann durch Verwendung eines als IC erhältlichen «sample + hold» — Schaltkreises eine kostengünstige Ausfüh-15 rung erzielt werden. The method according to the invention offers considerable advantages over already known measures, namely the complete elimination of the effect of interspersed hum (including harmonics), furthermore all problems with precision and stability of filter components are eliminated; the device can be used without switching or other adaptations for 50 Hz and 60 Hz, and moreover an inexpensive design can be achieved by using a “sample + hold” circuit available as an IC.
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1 Blatt Zeichnungen 1 sheet of drawings
Claims (4)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH594781A CH652108A5 (en) | 1981-09-15 | 1981-09-15 | METHOD AND DEVICE FOR HUMBLE VOLTAGE SUPPRESSION IN AN ELECTROSTATICALLY ACTING THREAD ROLL MONITOR. |
DE19823215182 DE3215182C2 (en) | 1981-09-15 | 1982-04-23 | Method and device for operating an electrostatically acting thread runner |
JP57097895A JPS5847769A (en) | 1981-09-15 | 1982-06-09 | Method and device for operating lance top motion of thread electrostatically working |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH594781A CH652108A5 (en) | 1981-09-15 | 1981-09-15 | METHOD AND DEVICE FOR HUMBLE VOLTAGE SUPPRESSION IN AN ELECTROSTATICALLY ACTING THREAD ROLL MONITOR. |
Publications (1)
Publication Number | Publication Date |
---|---|
CH652108A5 true CH652108A5 (en) | 1985-10-31 |
Family
ID=4301965
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH594781A CH652108A5 (en) | 1981-09-15 | 1981-09-15 | METHOD AND DEVICE FOR HUMBLE VOLTAGE SUPPRESSION IN AN ELECTROSTATICALLY ACTING THREAD ROLL MONITOR. |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS5847769A (en) |
CH (1) | CH652108A5 (en) |
DE (1) | DE3215182C2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3517113A1 (en) * | 1985-05-11 | 1986-11-13 | Michael 3302 Cremlingen Zadow | Circuit arrangement for suppressing the power-line hum in useful signals |
JP2857880B2 (en) * | 1988-04-27 | 1999-02-17 | 株式会社バルダン | Lower thread detection device in sewing machine |
US4823597A (en) * | 1988-06-06 | 1989-04-25 | Myrick-White, Inc. | Sliver measuring apparatus |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH590173A5 (en) * | 1975-10-02 | 1977-07-29 | Zellweger Uster Ag | |
US4004236A (en) * | 1975-07-29 | 1977-01-18 | Sperry Rand Corporation | Programmable bandpass digital filter of analog signal |
DE2539129A1 (en) * | 1975-09-03 | 1977-03-17 | Georg Ing Grad Haubner | Digital filter with threshold RC circuit - feeds COSMOS gates whose output is same as input for inputs in pass band |
US4283788A (en) * | 1976-06-25 | 1981-08-11 | Cselt - Centro Studi E Laboratori Telecomunicazioni S.P.A. | Equalization system with preshaping filter |
DE2947776A1 (en) * | 1979-11-23 | 1981-06-04 | Biotronik Meß- und Therapiegeräte GmbH & Co Ingenieurbüro Berlin, 1000 Berlin | Mains-frequency interference suppressor for heart signals - uses common mode rejection with delay circuit synchronised to mains |
DE3005537A1 (en) * | 1980-02-14 | 1981-08-20 | Wolf, Max, 8103 Oberammergau | Transmission system with line fault rectifying circuit - splits HF into two symmetrical sections supplied to comparator controlling logic |
-
1981
- 1981-09-15 CH CH594781A patent/CH652108A5/en not_active IP Right Cessation
-
1982
- 1982-04-23 DE DE19823215182 patent/DE3215182C2/en not_active Expired
- 1982-06-09 JP JP57097895A patent/JPS5847769A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
DE3215182C2 (en) | 1985-02-07 |
JPS641388B2 (en) | 1989-01-11 |
DE3215182A1 (en) | 1983-04-14 |
JPS5847769A (en) | 1983-03-19 |
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