EP0868382B1 - Method for monitoring scanning conditions during control of a yarn feeder - Google Patents

Method for monitoring scanning conditions during control of a yarn feeder Download PDF

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Publication number
EP0868382B1
EP0868382B1 EP96942317A EP96942317A EP0868382B1 EP 0868382 B1 EP0868382 B1 EP 0868382B1 EP 96942317 A EP96942317 A EP 96942317A EP 96942317 A EP96942317 A EP 96942317A EP 0868382 B1 EP0868382 B1 EP 0868382B1
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EP
European Patent Office
Prior art keywords
signal
threshold value
sensor device
circuit component
scanning
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Expired - Lifetime
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EP96942317A
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German (de)
French (fr)
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EP0868382A1 (en
Inventor
Friedrich Weber
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Memminger IRO GmbH
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Memminger IRO GmbH
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Publication of EP0868382A1 publication Critical patent/EP0868382A1/en
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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
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • D04B15/486—Monitoring reserve quantity
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum

Definitions

  • the invention relates to a method according to the preamble of claim 1 and a thread delivery device according to the preamble of claim 7.
  • the output signal of a sensor becomes a speed signal derived for the control circuit.
  • a certain quality of light transmission is required for the sensor device to work. Pollution when processing thread inevitable fluff accumulation worsens with increasing Operating time the light transmission quality.
  • the sensor device fails and to empty the storage area. This can lead to an error in the Guide the product in the textile machine by the thread delivery device with thread is supplied. It is therefore common for an operator to have experience based cleaning of the light transmission path, e.g. with compressed air or by wiping. However, these cleaning operations either done more often than necessary or it happens due to lack of care the operator occasionally to a fault.
  • the invention has for its object a method of the type mentioned and to specify a thread delivery device, with the structurally and technically simple and reliable such a deterioration in the sampling ratios is determined and displayed , which still allows proper functioning of the sensor device and itself without damage to the product of the textile machine supplied by the thread delivery device can be eliminated.
  • the method uses an object output signal generated for control purposes also for checking the quality of the sampling ratios, e.g. the quality of light transmission, used, with surface areas of the storage area and / or an object Thread can apply.
  • This does not require any noteworthy additional components in the sensor device or on the storage surface.
  • It will be the one for the function decisive sampling ratios of the sensor device, e.g. the light transmission quality, checked in the scanning zone, i.e. exactly where they are required for the function of the Sensor device for control, e.g. the drive motor, are crucial, and not at a location away from the scan zone.
  • the scanning conditions are checked exactly in the thread delivery device the location where the object is scanned, i.e. where the quality of the sampling ratio crucial for the correct functioning of the sensor device Has. Because the object output signal itself is additionally used as the basis for the test signal there are no additional sensor parts or tools on the storage area required. It will be the components that are already available for object scanning also used for the test routine. This also ensures that the sampling ratio only checked during working periods and that the operating personnel alarm signal prompting for fault elimination is generated, in which a Deterioration of the sampling ratio disturb the operation of the sensor device can, and not permanently, i.e. not during unimportant periods in which the sampling ratio anyway has no influence on the operation of the sensor device Has.
  • the structural features provided are both for a thread delivery device with storage area driven by the drive motor (rotary driven storage body) as well as for thread delivery devices with a storage area that is stationary during operation (stationary storage drum and rotary winding element) useful to be able to reliably determine when to rectify a fault is required.
  • a simple logical evaluation of the occurrence or non-occurrence of the two signals is carried out to prevent the Generate alarm signal at the right time and based on the right sampling condition.
  • the object output signal both the test signal and that usable for control purposes of the drive motor Speed signal formed.
  • the sampling ratios are only checked then when the drive motor is to be driven and the danger of emptying the storage space. Although from the Failure of the test signal the alarm signal is generated the speed signal is still for unobstructed use on.
  • the comparison is of the signals reliable because the output signal and that Test signal can be compared to a threshold value.
  • the higher threshold represents the just allowed Deterioration of the sampling ratios.
  • the output signal and the test signal are not only synchronous, but also in their decisive for the comparison with the threshold Signal level equal. Because the threshold for that Test signal is higher, the test signal remains off as soon as the just acceptable deterioration has occurred.
  • the Output signal is still present and can be used for control purposes use the predetermined manner. In the absence of the test signal, however, the alarm signal is generated.
  • the low threshold can be conveniently set to a stronger one Deterioration of the sampling ratios can be set at the proper functioning of the sensor device is not more is guaranteed. Should not respond to the alarm signal then the thread delivery device, and expediently also the textile machine supplied with thread, if there is also no output or speed signal be turned off to empty the storage area avoid.
  • both signals compared with the same threshold, but previously the signal level of the test signal changes so that off its comparison with the alarm threshold provides a precise statement the need for the alarm signal is obtained.
  • the method can be particularly useful in the case of optoelectronic and non-contact scanning in one with one opto-electronic sensor device equipped thread delivery device apply, according to claims 6 and 9, because between the signal level and the light transmission quality there is a predictable relationship.
  • this is the Object output signal representing the rotation speed of the drum used for the test routine, which is only due to the absence of the thread in the scanning zone Drum rests.
  • the alarm signal can then be generated simply and reliably, if the sampling ratios deteriorate accordingly to have. It is particularly useful that the operational security is only checked when the drive motor is driven and complements the thread supply. Because then there is the risk of emptying the storage area because the Limit of the thread supply depending on consumption behind the scanning zone has decreased. However, the drive motor no drive, no check is carried out. This is irrelevant, because then there will be a large thread supply anyway located on the storage area that extends into the scan zone enough. The troubleshooting or cleaning takes place expediently when the drive motor is at a standstill, so that the thread delivery device does not turn off needs and the production process of the textile machine does not have to be interrupted by the thread delivery device is supplied with thread.
  • test signal fails to appear as before applied output signal as speed signal for control considered and generates the alarm signal separately. It is advisable to use the already existing one Microprocessor of the control of the thread delivery device to use as linkage or monitoring device, because the microprocessor is usually one for this extra Program routine has sufficient capacity and only a software adjustment is required.
  • the device switches the thread delivery device via the shutdown element and expediently also on the textile machine supplied by it as soon as the opposite of the threshold value Speed signal fails because for some reason If the alarm signal occurs, the fault has not been rectified. This is a double security function.
  • the voltage divider generates the same signal level for the output signal and the test signal.
  • the two comparators set the two Signal level against two different threshold values. This means that what may be required for the control Speed signal even when a just permissible is reached Deterioration of the sampling ratio is still present, although the test signal has dropped and the alarm signal is produced.
  • the signal level for that is already in the voltage divider Test signal changed compared to the signal level of the output signal. From the output signal this can still be done if necessary speed signal required for control derived be while while reaching a just allowed Deterioration of the sampling ratio the test signal drops and the alarm signal is generated.
  • a thread delivery device F according to FIG. 1, in particular one Thread delivery device for a knitting machine, has a housing 13 for an electric drive motor 15 with which A drum 1 can be driven in rotation via a shaft 16.
  • an opto-electronic Sensor device 7 with (Fig. 2) several in the circumferential direction spaced apart on a scanning zone 12 (dash-dotted lines) aligned sensors S, e.g. adjustable, arranged parallel to the drum axis.
  • the sensor device 7 is via a control circuit L with a Control C of the drive motor 15 connected. Every sensor can, for example, from its own light source, e.g. For infrared light, and a receiver, e.g. a photodiode, exist that respond to reflection light.
  • the drum 1 defines a storage area 2 for a thread supply 5, which consists of turns 6 of a thread Y, the from the textile machine (not shown) (e.g. knitting machine) subtracted from the drum 1 as required becomes.
  • the thread Y is in an upper region of the drum 1 1 and wound up by the rotation of the drum 1, the drive motor 15 being controlled so that despite varying consumption of the Y thread, the thread supply 5 tried to maintain a size with which the thread supply 5 extends into the scanning zone 12.
  • the drive motor 15 Located in the scan zone 12 thread before, the drive motor 15 is stopped or delayed. If there is no thread in the scanning zone 12 before, then the drive motor 15 is driven or accelerated.
  • the drive speed is controlled via control C. of the drive motor 15 approximately the thread consumption customized.
  • the drum 1 can be designed as a rod cage with longitudinal rods R, which are separated by spaces Z from each other are separated. Instead of continuous spaces Z could also open longitudinal grooves in the drum 1 be provided. It is also conceivable to have a drum 1 smooth surface to use, the alternating in the circumferential direction Surface areas A, B with each other clearly various, e.g. optical, scanning properties. In the embodiment shown, the bars define R and the spaces Z first and second peripheral sections 8, 9 with clearly different scanning properties for sensors S of sensor device 7. Distribution of Surface areas A, B should be regular in the circumferential direction his. In the sensor device are in this embodiment three sensors S spaced apart in the circumferential direction, that at least one sensor S has a first circumferential section 8 and at least one second sensor S simultaneously a second one Circumferential section 9 scans.
  • the spokes 18 through the gaps Z extend up to a rotary bearing 17 on the shaft 16.
  • the pivot bearing 17 and the spoke star 19 are inclined to the axis 3 of the drum 1. Since the pivot bearing 17 on a Sleeve 17a is arranged to rotate with the Shaft 16 is prevented, the spoke star 19 pushes the thread supply 5 axially forward towards the scanning zone 12.
  • the feed effect could be a conical one Formation of the drum 1 can be achieved on the thread feed side.
  • the sensors S are housed together in a housing 30.
  • Translucent cover plates 31 or one for all Sensors S common cover window protect sensors S against direct pollution.
  • Fig. 3 schematically illustrates a possible block diagram Embodiment of the control circuit L, with the drive control signals for the drive motor 15 from the output signal of the sensor device 7 or the output signals of the sensors S are generated.
  • the sensors S consist of transmitters D7, D8 and D9 and receiver elements T1, T2 and T3, which preferably work with infrared light.
  • the sensors, the receivers and operational amplifiers 20, 21 and 22 cooperating with them connected together to a constant voltage source.
  • the received infrared radiation generates a photo current, which is the voltage across the working resistors influenced.
  • the voltages are amplified in the operational amplifiers 20, 21 and 22.
  • the outputs of the operational amplifiers 20, 21 and 22 are via a diode network connected to a central load resistor 40.
  • the diodes are like this polarized that the positive voltages at the upper point of the Working resistance 40 and the negative voltages at the base of the Working resistance 40 arrive.
  • a maximum is thus formed at the working resistor 40 Differential voltage between the maximum highest positive voltage and the maximum lowest negative voltage.
  • the positive value is about one Amplifier 38, the negative value, however, via an amplifier 39 to a differential amplifier 41 headed.
  • the voltage at the output of differential amplifier 41 corresponds to the proportional portion of the thread supply on the storage area.
  • the Voltage at the output of differential amplifier 41 is via a diode and a resistor network fed to a comparator 43. On a potentiometer 44 leaves the nominal value of the thread supply is set.
  • the comparator 43 provides control of the drive motor 15 the commands: run or stop.
  • the output signal of a sensor element S (D7, T1) is on the operational amplifier 20 additionally tapped over 14 and a circuit part D and a parallel circuit part E fed.
  • a line 24 leads from point 23 to an input of a Comparator 26, the other input of which is adjustable Threshold element 27 is connected.
  • the output of the comparator 26 is to a linkage or monitoring device V connected, preferably in a microprocessor M is integrated.
  • a warning signal generator is connected to it 4 and possibly a shutdown element 11.
  • the parallel circuit part E branches at point 23 with a line 25 from connected to an input of a second comparator 28 is the other entrance with a second Threshold element 29 is connected.
  • the exit of the second Comparator 28 is also connected to device V.
  • the threshold value element 27 is at a low threshold value which corresponds, for example, to a signal level, below that, e.g. due to deteriorated light transmission quality, the sensor device 7 is no longer functional is.
  • the threshold value element 29, however, is on one higher threshold value set, which is just a permissible Represents deterioration in light transmission quality, where the sensor device is still working properly can, an elimination of the light transmission quality
  • a test signal becomes synchronous and essentially at the same time and formed with the same signal level as the output signal.
  • the threshold value element 29 has a higher threshold value is set as the threshold 27, it remains Test signal on the device V off as soon as its level below the threshold drops.
  • the signal generator 4 activates, preferably, an optical one or emit an acoustic signal. Will the pollution not eliminated, then the microprocessor M can fail also activate the shutdown element 11 of the speed signal and turn off the thread delivery device and the textile machine, to avoid emptying the drum 1 if necessary.
  • Fig. 4 illustrates a variation of the circuit part D and of the parallel circuit part E.
  • line 14 is a Voltage divider provided from resistors 32, 33, 34. in the Point 35 between resistors 32 and 33 branches the line 24 to an input of the comparator 26. From point 37 however, the line branches between resistors 33 and 34 25 to an input of the second comparator 28.
  • the Signal level (voltage level) from the output signal at the point 37 (test signal) is lower than at point 35.
  • the respective other input of the first and second comparators 26, 28 is connected to a common threshold element 36 which is set to a certain threshold (a reference voltage).
  • the threshold 36 is exactly on point set, at which the pollution just barely permissible, but too high for the signal level of the test signal Limit reached.
  • the comparator 28 switches at a higher threshold than that Comparator 26. If the sensor device is contaminated accordingly, so the comparator 28 can no longer switch through. By checking the equivalency of the output voltages of the comparators 26, 28 is determined in the microprocessor M that a Warning signal is to be issued. The warning signal generator 4 is activated.
  • FIG. 5 illustrates the object output signal 38 'in a U / t diagram. in line 14, as determined by sensor S, D7, T1 depending on the passage of the circumferential sections 8, 9 or of the different surface areas A, B is generated.
  • the light transmission quality is at the first two signal levels still flawless.
  • the quality of the Light transmission off. 3 - as in the diagram 5A - a signal 39 'on.
  • the one set on the threshold 27 Threshold is indicated by U1.
  • the comparator 26 results a signal sequence C according to FIG. 5C.
  • the comparator 28 results however, a signal sequence G according to FIG. 5C.
  • the signal sequence is G not available anymore.
  • a check for the equality of the signal sequences results in a logical one Signal sequence H in Fig. 5C.
  • the microprocessor M activates this Doubletree 4.
  • the threshold value U2 represents a just acceptable deterioration of the Sampling ratios, i.e. the light transmission quality at which the sensor device 7 still working properly, as indicated by the one in Fig. 5A below signal 39 'still present after time X and signal sequence C in FIG. 5C is made clear. It should be noted that the light transmission quality usually deteriorates within a significantly longer period of time than it can be derived from FIGS. 5, 5A, 5B, 5C. These figures are in terms of time To be better understood as a schematic only.
  • the diagram according to FIG. 5B belongs to the variant according to FIG. 4.
  • a signal 39 "corresponding to signal 39 'of FIG. 5A is present.
  • the threshold U1 corresponds to the threshold value U1 of FIG. 5A. It can be seen at the top in FIG. 5B that how due to the voltage divider the signal level from the object output signal 38 'derived test signal 40 "are respectively lower than the signal levels of signal 39 ", but the same for test signal 40" Threshold value U1 is taken into account as for signal 39 ". The first three signal levels of the test signal 40 "are still high enough to close the second comparator 28 happen. However, the fourth signal level is lower than the threshold value U1, so that then the test signal 40 "does not appear at the logic device V and the warning signal is produced.
  • An antivalence control device is used to evaluate the components Matching the test signal with the speed signal created.
  • This antivalence control device can be easily implemented in the microprocessor M on the software side. The quality of the light transmission is only checked if if the drive motor is driven to supplement the thread supply, because at idle drum anyway the sensor device only scans the thread and the reflective rods R does not see or the quality of the reflection light transmission cannot judge reliably.
  • the method can also be used with other physical scanning principles, e.g. when scanning using sound, induction, magnetism, capacitance or the like.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Patentanspruchs 1 sowie eine Fadenliefervorrichtung gemäß dem Oberbegriff des Patentanspruchs 7.The invention relates to a method according to the preamble of claim 1 and a thread delivery device according to the preamble of claim 7.

Bei einem aus US 4 865 085 (entsprechend EP-0 199 059 B1) bekannten Verfahren dieser Art arbeitet die Sensorvorrichtung mit einem die axiale Bewegung von Fadenwindungen auf einer stillstehenden Speichertrommel überwachenden Empfänger und einem zweiten, die Qualität der Lichtübertragung überwachenden, nur für diesen Zweck vorgesehenen Empfänger. Ein Ausgangssignal des zweiten Empfängers wird einem Schwellwert gegenübergesetzt, um ein zusätzliches Nutzsignal zu erhalten, mit dem die Lichtstärke für beide Empfänger bei Verschlechterung der Lichtübertragung gesteigert wird. Es kann auch ein Warnsignal für eine Bedienungsperson erzeugt werden, das auf die Notwendigkeit der Reinigung des Lichtübertragungsweges von die Lichtübertragung beeinträchtigenden Verschmutzungen hinweist.In one known from US 4,865,085 (corresponding to EP-0 199 059 B1) The sensor device works in this way with one the axial movement of thread turns on one stationary receiver monitoring receiver and a second, monitoring the quality of light transmission, intended recipients only. An output signal the second receiver is compared to a threshold value, to get an additional useful signal, with which the light intensity for both receivers in the event of deterioration the light transmission is increased. It can also be a Warning signal for an operator that is generated the need to clean the light transmission path from dirt which impairs the transmission of light indicates.

Auch nach einem aus US-A-4 963 757 bekannten Verfahren speist eine Lichtquelle zwei Empfänger, von denen der eine einen Faden und der andere nur die Lichtübertragungsqualität abtastet, um die Relation zwischen den Ausgangssignalen der beiden Empfänger im wesentlichen konstant halten und eine Verschlechterung der Lichtübertragung kompensieren zu können.Also feeds according to a method known from US-A-4,963,757 a light source two receivers, one of which is a thread and the other one just samples the light transmission quality, the relation between the output signals of the two Keep receiver essentially constant and deteriorate to be able to compensate for the light transmission.

Bei einem aus US-A-3 907 440 bekannten Verfahren werden mit zwei gepulsten Lichtquellen phasenverschobene Lichtimpulse für einen Empfänger erzeugt, wobei nur mit den Lichtimpulsen der einen Lichtquelle ein Faden abgetastet wird. Die Ausgangssignale aus den nicht für die Fadenabtastung benutzten Lichtimpulsen werden mit einem Nominalsignalwert verglichen, um eine bestimmte Relation zwischen den beiden Signalen einhalten und Störeinflüsse kompensieren zu können.In a method known from US-A-3 907 440 using two pulsed light sources phase-shifted light pulses generated for a receiver, only with the light pulses a thread is scanned by a light source. The output signals from those not used for thread scanning Light pulses are compared to a nominal signal value to maintain a certain relationship between the two signals and interference to be able to compensate.

Aus GB-A-22 27 092 ist es bekannt, einen opto-elektronischen Sensor aus Lichtquelle und Empfänger in einem Banknoten-Empfangs- und Ausgabegerät bezüglich der momentanen Abtasteigenschaften zu überprüfen, ehe der Sensor bei der Untersuchung einer Banknote mitwirkt. In einer Prüfroutine wird durch steuerungsseitig vorgenommenes Abdunkeln der Lichtquelle gegenüber deren normaler Lichtstärke ein Zustand simuliert, wie er später bei der Überprüfung einer Banknote auftreten kann. Der Pegel dabei auftretender Ausgangssignale des Empfängers wird mit einem Schwellwertpegel verglichen, den die Steuerung aus denjenigen Ausgangssignalen des Empfängers errechnet, die sich ohne und mit Abdunklung ergeben. Liegt der Pegel des abgedunkelten Ausgangssignals unterhalb des Schwellwertpegels, dann wird Alarm ausgelöst.From GB-A-22 27 092 it is known an opto-electronic sensor from a light source and receivers in a banknote receiving and dispensing device with respect to to check the current scanning properties before the sensor is examined contributes to a banknote. In a test routine, the control side Darken the light source compared to its normal light intensity Condition simulates how it can later appear when checking a banknote. The level of the output signals of the receiver occurring is determined by a Threshold level compared, which the control from those output signals of the receiver calculated, which result without and with darkening. Is the level of the darkened output signal below the threshold level, then Alarm triggered.

Bei einem, dem Oberbegriff der Ansprüche 1 und 7 zugrundeliegenden, aus WO95/16628 bekannten Verfahren zum Steuern des Antriebsmotors einer Strickmaschinen-Fadenliefervorrichtung mit drehantreibbarer Speichertrommel und stationärer Sensorvorrichtung werden in der Abtastzone in Umfangsrichtung versetzte Oberflächenbereiche der Speicherfläche mit mehreren Sensoren gleichzeitig opto-elektronisch abgetastet. Befindet sich der Faden in der Abtastzone, dann geben die Sensoren gleichzeitig gleiche Ausgangssignale ab. Bei Abwesenheit des Fadens in der Abtastzone erzeugen die Sensoren hingegen gleichzeitig unterschiedliche Ausgangssignale. Durch Diskriminieren zwischen den Ausgangssignalen werden Steuersignale abgeleitet und wird der Antriebsmotor bei fadenfreier Abtastzone angetrieben, bis der Faden wieder die Abtastzone erreicht. Beim Ergänzen des Fadenvorrats, d.h. bei angetriebenem Antriebsmotor, wird aus dem Ausgangssignal eines Sensors ein Drehzahlsignal für die Steuerschaltung abgeleitet. Eine bestimmte Qualität der Lichtübertragung ist für das Arbeiten der Sensorvorrichtung erforderlich. Verschmutzungen beim Verarbeiten von Faden unvermeidlicher Flusenanfall verschlechtem mit zunehmender Betriebsdauer die Lichtübertragungsqualität. Es kommt zum Ausfall der Sensorvorrichtung und zum Leeren der Speicherfläche. Dies kann zu einem Fehler im Produkt in der Textilmaschine führen, die von der Fadenliefervorrichtung mit Faden versorgt wird. Es ist deshalb üblich, daß eine Bedienungsperson in auf Erfahrungswerten basierenden Abständen eine Reinigung des Lichtübertragungswegs vornimmt, z.B. mit Druckluft oder durch Abwischen. Jedoch werden diese Reinigungsvorgänge entweder häufiger als nötig durchgeführt oder es kommt aufgrund mangelnder Sorgfalt der Bedienungsperson fallweise zu einer Störung.In one, on which the preamble of claims 1 and 7 are based, from WO95 / 16628 known method for controlling the drive motor of a knitting machine thread delivery device with drivable storage drum and stationary Sensor devices become surface areas offset in the circumferential direction in the scanning zone the storage area with several sensors simultaneously opto-electronic scanned. If the thread is in the scanning zone, then the sensors give same output signals at the same time. In the absence of the thread in the scanning zone however, the sensors generate different output signals at the same time. By discriminating between the output signals, control signals become derived and the drive motor is driven with a thread-free scanning zone until the Thread has reached the scanning zone again. When adding to the thread supply, i.e. when powered Drive motor, the output signal of a sensor becomes a speed signal derived for the control circuit. A certain quality of light transmission is required for the sensor device to work. Pollution when processing thread inevitable fluff accumulation worsens with increasing Operating time the light transmission quality. The sensor device fails and to empty the storage area. This can lead to an error in the Guide the product in the textile machine by the thread delivery device with thread is supplied. It is therefore common for an operator to have experience based cleaning of the light transmission path, e.g. with compressed air or by wiping. However, these cleaning operations either done more often than necessary or it happens due to lack of care the operator occasionally to a fault.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art sowie eine Fadenliefervorrichtung anzugeben, mit der auf baulich und schaltungstechnisch einfache Weise und zuverlässig eine derartige Verschlechterung der Abtastverhältnisse festgestellt und angezeigt wird, die noch eine ordnungsgemäße Funktion der Sensorvorrichtung erlaubt und sich ohne Schaden für das Produkt der von der Fadenliefervorrichtung versorgten Textilmaschine beseitigen läßt.The invention has for its object a method of the type mentioned and to specify a thread delivery device, with the structurally and technically simple and reliable such a deterioration in the sampling ratios is determined and displayed , which still allows proper functioning of the sensor device and itself without damage to the product of the textile machine supplied by the thread delivery device can be eliminated.

Die gestellte Aufgabe wird erfindungsgemäß mit den Merkmalen des Patentanspruchs 1 und den Merkmalen des Patentanspruchs 7 gelöst.The object is achieved according to the invention with the features of the patent claim 1 and the features of claim 7 solved.

Bei dem Verfahren wird ein zu Steuerungszwecken erzeugtes Objekt-Ausgangssignal auch zum Prüfen der Qualität der Abtastverhältnisse, z.B. der Lichtübertragungsqualität, eingesetzt, wobei als Objekt Oberflächenbereiche der Speicherfläche und/oder ein Faden gelten können. Dies erfordert keine nennenswerten zusätzlichen Komponenten in der Sensorvorrichtung bzw. an der Speicherfläche. Es werden die für die Funktion der Sensorvorrichtung entscheidenden Abtastverhältnisse, z.B. die Lichtübertragungsqualität, in der Abtastzone überprüft, d.h. exakt dort, wo sie für die Funktion der Sensorvorrichtung zur Steuerung, z.B. des Antriebsmotors, entscheidend sind, und nicht an einer von der Abtastzone entfernten Stelle. Durch eine Verschlechterung der Abtastverhältnisse ändert sich der Signalpegel des Ausgangssignals und auch des Prüfsignals, das dem auf eine gerade noch zulässige Verschlechterung der Abtastverhältnisse abgestimmten Schwellwert gegenübergesetzt wird und schließlich unter diesen abfällt. Dies führt zum Alarmsignal. Damit wird eine Bedienungsperson rechtzeitig, d.h. weder zu früh noch zu spät, alarmiert, den Arbeitsbereich der Sensorvorrichtung, d.h. beispielsweise den Lichtübertragungsweg, zu reinigen. Es kann das Alarmsignal jedoch in besonders zweckmäßiger Weise auch dazu verwendet werden, automatisch eine Reinigungsvorrichtung für die Sensorvorrichtung zu aktivieren, die selbständig den Reinigungsvorgang durchführt, z.B. durch Wegblasen oder Wegwischen von Verunreinigungen. The method uses an object output signal generated for control purposes also for checking the quality of the sampling ratios, e.g. the quality of light transmission, used, with surface areas of the storage area and / or an object Thread can apply. This does not require any noteworthy additional components in the sensor device or on the storage surface. It will be the one for the function decisive sampling ratios of the sensor device, e.g. the light transmission quality, checked in the scanning zone, i.e. exactly where they are required for the function of the Sensor device for control, e.g. the drive motor, are crucial, and not at a location away from the scan zone. By worsening the Sampling ratios change the signal level of the output signal and also the Test signal that indicates a just acceptable deterioration in the sampling ratio matched threshold and finally falls among these. This leads to the alarm signal. It becomes an operator in time, i.e. neither too early nor too late, alarmed, the working area of the sensor device, i.e. for example, to clean the light transmission path. It can Alarm signal, however, can also be used in a particularly expedient manner automatically activate a cleaning device for the sensor device that independently performs the cleaning process, e.g. by blowing or wiping away of impurities.

In der Fadenliefervorrichtung erfolgt die Überprüfung der Abtastverhältnisse exakt an dem Ort, an dem das Objekt abgetastet wird, d.h., dort, wo die Qualität des Abtastverhältnisses für das korrekte Arbeiten der Sensorvorrichtung entscheidende Bedeutung hat. Da das Objektausgangssignal selbst zusätzlich als Basis für das Prüfsignal benutzt wird, sind keine zusätzlichen Sensorteile oder Hilfsmittel an der Speicherfläche erforderlich. Es werden die ohnedies für die Objektabtastung vorhandenen Komponenten auch für die Prüfroutine benutzt. Damit wird ferner erreicht, daß das Abtastverhältnis nur während Arbeitsperioden überprüft und daß das das Bedienungspersonal zur Störungsbeseitigung auffordernde Alarmsignal erzeugt wird, in denen eine Verschlechterung des Abtastverhältnisses das Arbeiten der Sensorvorrichtung stören kann, und nicht permanent, d.h., nicht während unwichtiger Zeitperioden, in denen das Abtastverhältnis ohnedies keinen Einfluß auf das Arbeiten der Sensorvorrichtung hat. Die vorgesehenen baulichen Merkmale sind sowohl bei einer Fadenliefervorrichtung mit vom Antriebsmotor angetriebener Speicherfläche (drehangetriebener Speicherkörper) als auch für Fadenliefervorrichtungen mit im Betrieb stationärer Speicherfläche (stationärer Speichertrommel und drehangetriebenem Aufwickelelement) zweckmäßig, um zuverlässig feststellen zu können, wann eine Störungsbeseitigung erforderlich ist.The scanning conditions are checked exactly in the thread delivery device the location where the object is scanned, i.e. where the quality of the sampling ratio crucial for the correct functioning of the sensor device Has. Because the object output signal itself is additionally used as the basis for the test signal there are no additional sensor parts or tools on the storage area required. It will be the components that are already available for object scanning also used for the test routine. This also ensures that the sampling ratio only checked during working periods and that the operating personnel alarm signal prompting for fault elimination is generated, in which a Deterioration of the sampling ratio disturb the operation of the sensor device can, and not permanently, i.e. not during unimportant periods in which the sampling ratio anyway has no influence on the operation of the sensor device Has. The structural features provided are both for a thread delivery device with storage area driven by the drive motor (rotary driven storage body) as well as for thread delivery devices with a storage area that is stationary during operation (stationary storage drum and rotary winding element) useful to be able to reliably determine when to rectify a fault is required.

Bei der Verfahrensvariante gemäß Anspruch 2 wird eine einfache logische Auswertung des Auftretens oder Nichtauftretens der beiden Signale durchgeführt, um das Alarmsignal zum richtigen Zeitpunkt und aufgrund der richtigen Abtastkondition zu erzeugen.In the method variant according to claim 2, a simple logical evaluation of the occurrence or non-occurrence of the two signals is carried out to prevent the Generate alarm signal at the right time and based on the right sampling condition.

Bei der Verfahrensvariante gemäß Anspruch 3 wird aus dem Objekt-Ausgangssignal sowohl das Prüfsignal als auch das für Steuerzwecke des Antriebsmotors brauchbare Drehzahlsignal gebildet. Es erfolgt die Überprüfung der Abtastverhältnisse nur dann, wenn auch der Antriebsmotor anzutreiben ist und die Gefahr des Leerens der Speicherfläche besteht. Obwohl aus dem Ausbleiben des Prüfsignals das Alarmsignal erzeugt wird, liegt das Drehzahlsignal weiterhin zur unbehinderten Nutzung an.In the method variant according to claim 3, the object output signal both the test signal and that usable for control purposes of the drive motor Speed signal formed. The sampling ratios are only checked then when the drive motor is to be driven and the danger of emptying the storage space. Although from the Failure of the test signal the alarm signal is generated the speed signal is still for unobstructed use on.

Bei der Verfahrensvariante gemäß Anspruch 4 ist der Vergleich der Signale zuverlässig, weil das Ausgangssignal und das Prüfsignal jeweils einem Schwellwert gegenübergestellt werden. Der höhere Schwellwert repräsentiert die gerade noch zulässige Verschlechterung der Abtastverhältnisse. Das Ausgangssignal und das Prüfsignal sind nicht nur synchron, sondern auch in ihren für den Vergleich mit dem Schwellwert entscheidenden Signalpegel gleich. Da der Schwellwert für das Prüfsignal höher ist, bleibt das Prüfsignal aus, sobald die gerade noch zulässige Verschlechterung eingetreten ist. Das Ausgangssignal liegt weiterhin an und läßt sich für Steuerungszwecke der vorbestimmten Weise nutzen. Beim Ausbleiben des Prüfsignals wird jedoch das Alarmsignal erzeugt. Der niedrige Schwellwert kann zweckmäßigerweise auf eine stärkere Verschlechterung der Abtastverhältnisse eingestellt sein, bei der eine ordnungsgemäße Funktion der Sensorvorrichtung nicht mehr gewährleistet ist. Sollte auf das Alarmsignal nicht reagiert werden, dann kann die Fadenliefervorrichtung, und zweckmäßigerweise auch die davon mit Faden versorgte Textilmaschine, beim Ausbleiben auch des Ausgangs- oder Drehzahlsignals abgestellt werden, um ein Leeren der Speicherfläche zu vermeiden.In the method variant according to claim 4, the comparison is of the signals reliable because the output signal and that Test signal can be compared to a threshold value. The higher threshold represents the just allowed Deterioration of the sampling ratios. The output signal and the test signal are not only synchronous, but also in their decisive for the comparison with the threshold Signal level equal. Because the threshold for that Test signal is higher, the test signal remains off as soon as the just acceptable deterioration has occurred. The Output signal is still present and can be used for control purposes use the predetermined manner. In the absence of the test signal, however, the alarm signal is generated. The low threshold can be conveniently set to a stronger one Deterioration of the sampling ratios can be set at the proper functioning of the sensor device is not more is guaranteed. Should not respond to the alarm signal then the thread delivery device, and expediently also the textile machine supplied with thread, if there is also no output or speed signal be turned off to empty the storage area avoid.

Alternativ werden bei der Verfahrensvariante gemäß Anspruch 5 beide Signale mit gleichem Schwellwert verglichen, zuvor jedoch der Signalpegel des Prüfsignals so verändert, daß aus dessen Vergleich mit dem Alarmschwellwert eine präzise Aussage zur Notwendigkeit des Alarmsignals gewonnen wird. Alternatively, in the method variant according to claim 5 both signals compared with the same threshold, but previously the signal level of the test signal changes so that off its comparison with the alarm threshold provides a precise statement the need for the alarm signal is obtained.

Das Verfahren läßt sich besonders zweckmäßig bei optoelektronischer und berührungsloser Abtastung in einer mit einer opto-elektronischen Sensorvorrichtung ausgestatteten Fadenliefervorrichtung anwenden, gemäß den Ansprüchen 6 und 9, weil zwischen dem Signalpegel und der Lichtübertragungsqualität ein gut vorhersehbares Verhältnis vorliegt.The method can be particularly useful in the case of optoelectronic and non-contact scanning in one with one opto-electronic sensor device equipped thread delivery device apply, according to claims 6 and 9, because between the signal level and the light transmission quality there is a predictable relationship.

Dabei ist die Anwendbarkeit dieses Verfahrens und der baulichen Merkmale zum Durchführen des Verfahrens nicht auf eine opto-elektronische Abtastung beschränkt, sondern es ist auch möglich, das Prinzip, ein ohnedies für einen bestimmten Steuerungszweck erzeugtes Ausgangssignal für eine Prüfroutine zu verwenden, bei anderen berührungslosen Abtastarten (Schall, Induktion etc.) und sogar bei berührender Fadenabtastung zu realisieren. Entscheidend ist, daß das für die Prüfroutine verwendete Ausgangssignal von der Abtastung des Objekts in der Abtastzone stammt und einen gut auszuwertenden Signalpegel besitzt, der sich bei Verschlechterung der Abtastverhältnisse, z.B. durch abgelagerte Verschmutzungen, entsprechend verändert. Das Prinzip ist auch für Fadenliefervorrichtungen brauchbar, die eine stationäre Speicherfläche für den Faden besitzen. Das Ausgangssignal braucht nicht unbedingt eine Signalkette zu sein, obwohl dies in manchen Fällen günstig ist.The applicability of this method and the structural Features for performing the method not on one opto-electronic scanning is limited, but it is too possible, the principle, anyway for a particular Control signal generated output signal for a test routine to be used with other non-contact scanning types (Sound, induction etc.) and even with touching thread scanning to realize. It is crucial that this for the Test routine used output signal from the sampling of the Object in the scanning zone and one that can be evaluated well Has a signal level that changes as the sampling ratio deteriorates, e.g. due to deposited dirt, changed accordingly. The principle is also for thread delivery devices usable which is a stationary storage area own for the thread. The output signal does not necessarily need to be a chain of signals, although in some cases is cheap.

Bei der Fadenliefervorrichtung gemäß Anspruch 8 wird das die Drehgeschwindigkeit der Trommel repräsentierende Objekt-Ausgangssignal für die Prüfroutine benutzt, das nur bei aufgrund der Abwesenheit des Fadens in der Abtastzone angetriebener Trommel anliegt. Mittels des nachgebildeten Prüfsignals läßt sich das Alarmsignal einfach und zuverlässig dann erzeugen, wenn sich die Abtastverhältnisse entsprechend verschlechtert haben. Besonders zweckmäßig ist, daß die Betriebssicherheit nur überprüft wird, wenn der Antriebsmotor angetrieben wird und den Fadenvorrat ergänzt. Denn dann besteht die Gefahr einer Leerung der Speicherfläche, weil die Grenze des Fadenvorrats verbrauchsabhängig hinter die Abtastzone zurückgegangen ist. Wird der Antriebsmotor hingegen nicht angetrieben, wird auch keine Überprüfung durchgeführt. Dies ist unerheblich, weil sich dann ohnedies ein großer Fadenvorrat auf der Speicherfläche befindet, der bis in die Abtastzone reicht. Die Störungsbeseitigung bzw. Reinigung erfolgt zweckmäßigerweise bei gerade stehendem Antriebsmotor, so daß die Fadenliefervorrichtung nicht abgeschaltet zu werden braucht und der Produktionsprozeß der Textilmaschine nicht unterbrochen werden muß, die von der Fadenliefervorrichtung mit Faden versorgt wird.In the yarn delivery device according to claim 8, this is the Object output signal representing the rotation speed of the drum used for the test routine, which is only due to the absence of the thread in the scanning zone Drum rests. By means of the simulated test signal the alarm signal can then be generated simply and reliably, if the sampling ratios deteriorate accordingly to have. It is particularly useful that the operational security is only checked when the drive motor is driven and complements the thread supply. Because then there is the risk of emptying the storage area because the Limit of the thread supply depending on consumption behind the scanning zone has decreased. However, the drive motor no drive, no check is carried out. This is irrelevant, because then there will be a large thread supply anyway located on the storage area that extends into the scan zone enough. The troubleshooting or cleaning takes place expediently when the drive motor is at a standstill, so that the thread delivery device does not turn off needs and the production process of the textile machine does not have to be interrupted by the thread delivery device is supplied with thread.

Bei der Ausführungsform der Fadenliefervorrichtung gemäß Anspruch 10 wird das bei Ausbleiben des Prüfsignals nach wie vor anliegende Ausgangssignal als Drehzahlsignal zur Steuerung berücksichtigt und getrennt davon das Alarmsignal erzeugt. Dabei ist es zweckmäßig, den ohnedies zumeist vorhandenen Mikroprozessor der Steuerung der Fadenliefervorrichtung als Verknüpfungs- bzw. Überwachungseinrichtung zu benutzen, weil der Mikroprozessor in der Regel eine für diese zusätzliche Programmroutine ausreichende Kapazität aufweist und nur eine software-seitige Anpassung benötigt.In the embodiment of the thread delivery device according to claim 10 if the test signal fails to appear as before applied output signal as speed signal for control considered and generates the alarm signal separately. It is advisable to use the already existing one Microprocessor of the control of the thread delivery device to use as linkage or monitoring device, because the microprocessor is usually one for this extra Program routine has sufficient capacity and only a software adjustment is required.

Bei der Ausführungsform gemäß Anspruch 11 schaltet die Einrichtung über das Abschaltglied die Fadenliefervorrichtung und zweckmäßigerweise auch auf die davon versorgte Textilmaschine ab, sobald auch das dem Schwellwert gegenübergesetzte Drehzahlsignal ausbleibt, weil aus irgendwelchen Gründen nach Auftreten des Alarmsignals die Störung nicht behoben wurde. Dies ist eine doppelte Sicherheitsfunktion.In the embodiment according to claim 11, the device switches the thread delivery device via the shutdown element and expediently also on the textile machine supplied by it as soon as the opposite of the threshold value Speed signal fails because for some reason If the alarm signal occurs, the fault has not been rectified. This is a double security function.

Bei der Ausführungsform gemäß Anspruch 12 erzeugt der Spannungsteiler den gleichen Signalpegel für das Ausgangssignal und das Prüfsignal. Die beiden Komparatoren setzen die beiden Signalpegel zwei unterschiedlichen Schwellwerten gegenüber. Dadurch wird das für die Steuerung gegebenenfalls benötigte Drehzahlsignal auch bei Erreichen einer gerade noch zulässigen Verschlechterung der Abtastverhältnisse weiterhin anliegen, obwohl das Prüfsignal abgefallen ist und das Alarmsignal erzeugt wird.In the embodiment according to claim 12, the voltage divider generates the same signal level for the output signal and the test signal. The two comparators set the two Signal level against two different threshold values. This means that what may be required for the control Speed signal even when a just permissible is reached Deterioration of the sampling ratio is still present, although the test signal has dropped and the alarm signal is produced.

Bei der alternativen Ausführungsform gemäß Anspruch 13 wird hingegen bereits im Spannungsteiler der Signalpegel für das Prüfsignal gegenüber dem Signalpegel des Ausgangssignals verändert. Aus dem Ausgangssignal kann nach wie vor das gegebenenfalls zur Steuerung benötigte Drehzahlsignal abgeleitet werden, während bei Erreichen einer gerade noch zulässigen Verschlechterung der Abtastverhältnisse das Prüfsignal abfällt und das Alarmsignal erzeugt wird.In the alternative embodiment according to claim 13 on the other hand, the signal level for that is already in the voltage divider Test signal changed compared to the signal level of the output signal. From the output signal this can still be done if necessary speed signal required for control derived be while while reaching a just allowed Deterioration of the sampling ratio the test signal drops and the alarm signal is generated.

Bei der Ausführungsform gemäß Anspruch 14 wird eine sehr zuverlässige, vorzugsweise opto-elektronische, Fadenabtastung mit präziser Steuerung des Antriebsmotors durch die mehreren Einzelsensoren erreicht, wobei nur das Ausgangssignal eines Einzelsensors für die Prüfroutine herangezogen wird.In the embodiment according to claim 14, a very reliable, preferably opto-electronic, thread scanning with precise control of the drive motor by the several Individual sensors reached, with only the output signal of one Individual sensor is used for the test routine.

Anhand der Zeichnung werden Ausführungsformen des Erfindungsgegenstandes erläutert. Es zeigen:

Fig. 1
einen Längsschnitt einer Fadenliefervorrichtung,
Fig. 2
einen Horizontalschnitt in der Ebene II-II von Fig. 1,
Fig. 3
ein Blockschaltbild einer Steuerschaltung,
Fig. 4
eine Detailvariante zu Fig. 3, und
Fig.5,5A 5B,5C
schematische U/t-Signaldiagramme.
Embodiments of the subject matter of the invention are explained with the aid of the drawing. Show it:
Fig. 1
a longitudinal section of a thread delivery device,
Fig. 2
2 shows a horizontal section in the plane II-II of FIG. 1,
Fig. 3
a block diagram of a control circuit,
Fig. 4
a detailed variant of Fig. 3, and
Fig.5.5A 5B, 5C
schematic U / t signal diagrams.

Eine Fadenliefervorrichtung F gemäß Fig. 1, insbesondere eine Fadenliefervorrichtung für eine Strickmaschine, weist ein Gehäuse 13 für einen elektrischen Antriebsmotor 15 auf, mit dem über eine Welle 16 eine Trommel 1 drehantreibbar ist. In einem gehäusefesten Ausleger 13' ist eine opto-elektronische Sensorvorrichtung 7 mit (Fig. 2) mehreren in Umfangsrichtung mit Zwischenabständen angeordneten, auf eine Abtastzone 12 (strichpunktiert angedeutet) ausgerichteten Sensoren S, z.B. parallel zur Trommelachse verstellbar, angeordnet. Die Sensorvorrichtung 7 ist über eine Steuerschaltung L mit einer Steuerung C des Antriebsmotors 15 verbunden. Jeder Sensor kann beispielsweise aus einer eigenen Lichtquelle, z.B. für infrarotes Licht, und einem Empfänger, z.B. einer Fotodiode, bestehen, die auf Reflektionslicht anspricht.A thread delivery device F according to FIG. 1, in particular one Thread delivery device for a knitting machine, has a housing 13 for an electric drive motor 15 with which A drum 1 can be driven in rotation via a shaft 16. In one bracket 13 'fixed to the housing is an opto-electronic Sensor device 7 with (Fig. 2) several in the circumferential direction spaced apart on a scanning zone 12 (dash-dotted lines) aligned sensors S, e.g. adjustable, arranged parallel to the drum axis. The sensor device 7 is via a control circuit L with a Control C of the drive motor 15 connected. Every sensor can, for example, from its own light source, e.g. For infrared light, and a receiver, e.g. a photodiode, exist that respond to reflection light.

Die Trommel 1 definiert eine Speicherfläche 2 für einen Fadenvorrat 5, der aus Windungen 6 eines Fadens Y besteht, der von der nicht dargestellten Textilmaschine (z.B. Strickmaschine) bedarfsabhängig überkopf der Trommel 1 abgezogen wird. Der Faden Y wird in einem oberen Bereich der Trommel 1 in Fig. 1 zugeführt und durch die Drehung der Trommel 1 aufgewickelt, wobei der Antriebsmotor 15 so gesteuert wird, daß er trotz variierenden Verbrauchs des Fadens Y den Fadenvorrat 5 in einer Größe aufrechtzuhalten versucht, mit der der Fadenvorrat 5 in die Abtastzone 12 reicht. Liegt in der Abtastzone 12 Faden vor, so wird der Antriebsmotor 15 angehalten oder verzögert. Liegt kein Faden in der Abtastzone 12 vor, dann wird der Antriebsmotor 15 angetrieben oder beschleunigt. Über die Steuerung C wird die Antriebsgeschwindigkeit des Antriebsmotors 15 annähernd dem Fadenverbrauch angepaßt.The drum 1 defines a storage area 2 for a thread supply 5, which consists of turns 6 of a thread Y, the from the textile machine (not shown) (e.g. knitting machine) subtracted from the drum 1 as required becomes. The thread Y is in an upper region of the drum 1 1 and wound up by the rotation of the drum 1, the drive motor 15 being controlled so that despite varying consumption of the Y thread, the thread supply 5 tried to maintain a size with which the thread supply 5 extends into the scanning zone 12. Located in the scan zone 12 thread before, the drive motor 15 is stopped or delayed. If there is no thread in the scanning zone 12 before, then the drive motor 15 is driven or accelerated. The drive speed is controlled via control C. of the drive motor 15 approximately the thread consumption customized.

Die Trommel 1 kann als Stabkäfig ausgebildet sein mit längsverlaufenden Stäben R, die durch Zwischenräume Z voneinander getrennt sind. Anstelle durchgehender Zwischenräume Z könnten auch nach außen offene Längsnuten in der Trommel 1 vorgesehen sein. Ferner ist es denkbar, eine Trommel 1 mit glatter Oberfläche zu benutzen, die in Umfangsrichtung abwechselnde Oberflächenbereiche A, B mit voneinander deutlich verschiedenen, z.B. optischen, Abtasteigenschaften aufweist. Bei der gezeigten Ausführungsform definieren die Stäbe R und die Zwischenräume Z erste und zweite Umfangsabschnitte 8, 9 mit voneinander klar verschiedenen Abtasteigenschaften für die Sensoren S der Sensorvorrichtung 7. Die Verteilung der Oberflächenbereiche A, B sollte in Umfangsrichtung regelmäßig sein. In der Sensorvorrichtung sind bei dieser Ausführungsform drei Sensoren S in Umfangsrichtung derart beabstandet, daß zumindest ein Sensor S einen ersten Umfangsabschnitt 8 und wenigstens ein zweiter Sensor S gleichzeitig einen zweiten Umfangsabschnitt 9 abtastet.The drum 1 can be designed as a rod cage with longitudinal rods R, which are separated by spaces Z from each other are separated. Instead of continuous spaces Z could also open longitudinal grooves in the drum 1 be provided. It is also conceivable to have a drum 1 smooth surface to use, the alternating in the circumferential direction Surface areas A, B with each other clearly various, e.g. optical, scanning properties. In the embodiment shown, the bars define R and the spaces Z first and second peripheral sections 8, 9 with clearly different scanning properties for sensors S of sensor device 7. Distribution of Surface areas A, B should be regular in the circumferential direction his. In the sensor device are in this embodiment three sensors S spaced apart in the circumferential direction, that at least one sensor S has a first circumferential section 8 and at least one second sensor S simultaneously a second one Circumferential section 9 scans.

In der Trommel 1 ist ein Speichenstern 19 als Vorschubelement G angeordnet, dessen Speichen 18 sich durch die Zwischenräume Z bis zu einer Drehlagerung 17 auf der Welle 16 erstrecken. Die Drehlagerung 17 und der Speichenstern 19 stehen schräg zur Achse 3 der Trommel 1. Da die Drehlagerung 17 auf einer Hülse 17a angeordnet ist, die an einer Drehbewegung mit der Welle 16 gehindert ist, schiebt der Speichenstern 19 den Fadenvorrat 5 axial in Richtung zur Abtastzone 12 vorwärts. Eine Vorschubwirkung könnte alternativ auch durch eine konische Ausbildung der Trommel 1 an der Fadenzulaufseite erzielt werden.In the drum 1 there is a spoke star 19 as a feed element G arranged, the spokes 18 through the gaps Z extend up to a rotary bearing 17 on the shaft 16. The pivot bearing 17 and the spoke star 19 are inclined to the axis 3 of the drum 1. Since the pivot bearing 17 on a Sleeve 17a is arranged to rotate with the Shaft 16 is prevented, the spoke star 19 pushes the thread supply 5 axially forward towards the scanning zone 12. A Alternatively, the feed effect could be a conical one Formation of the drum 1 can be achieved on the thread feed side.

Die Sensoren S sind gemeinsam in einem Gehäuse 30 untergebracht. Lichtdurchlässige Abdeckscheiben 31 oder ein für alle Sensoren S gemeinsames Abdeckfenster schützen die Sensoren S gegen eine direkte Verschmutzung. Auf oder vor diesen Abdeckscheiben 31 bzw. auf dem Abdeckfenster und/oder in der Abtastzone der Trommel 1 können sich Verschmutzungen ablagern.The sensors S are housed together in a housing 30. Translucent cover plates 31 or one for all Sensors S common cover window protect sensors S against direct pollution. On or in front of these covers 31 or on the cover window and / or in the scanning zone the drum 1 can accumulate dirt.

Fig. 3 verdeutlicht schematisch als Blockschaltbild eine mögliche Ausführungsform der Steuerschaltung L, mit der Antriebssteuersignale für den Antriebsmotor 15 aus dem Ausgangssignal der Sensorvorrichtung 7 bzw. den Ausgangssignalen der Sensoren S erzeugt werden.Fig. 3 schematically illustrates a possible block diagram Embodiment of the control circuit L, with the drive control signals for the drive motor 15 from the output signal of the sensor device 7 or the output signals of the sensors S are generated.

Die Sensoren S bestehen aus Sendern D7, D8 und D9 und Empfängerelementen T1, T2 und T3, die, vorzugsweise, mit infrarotem Licht arbeiten. Die Sensoren, die Empfänger und mit diesen zusammenarbeitende Operationsverstärker 20, 21 und 22 sind gemeinsam an eine Konstantspannungsquelle angeschlossen. Die empfangene Infrarotstrahlung erzeugt einen Fotostrom, der die Spannung an den Arbeitswiderständen beeinflußt. Die Spannungen werden in den Operationsverstärkern 20, 21 und 22 verstärkt. Die Ausgänge der Operationsverstärker 20, 21 und 22 sind über ein Diodennetzwerk mit einem zentralen Arbeitswiderstand 40 verbunden. Die Dioden sind so polarisiert verschaltet, daß die positiv wirkenden Spannungen am oberen Punkt des Arbeitswiderstandes 40 und die negativ wirkenden Spannungen am Fußpunkt des Arbeitswiderstandes 40 ankommen. So bildet sich am Arbeitswiderstand 40 eine maximale Differenzspannung zwischen der maximal höchsten positiven Spannung und der maximal niedrigsten negativen Spannung aus. Der positive Wert wird über einen Verstärker 38, der negative Wert hingegen über einen Verstärker 39 zu einem Differenzverstärker 41 geleitet. Die Spannung am Ausgang des Differenzverstärkers 41 entspricht dem proportionalen Anteil des Fadenvorrats auf der Speicherfläche. Die Spannung am Ausgang des Differenzverstärkers 41 wird über eine Diode und ein Widerstandsnetzwerk einem Komparator 43 zugeleitet. An einem Potentiometer 44 läßt sich der Sollwert des Fadenvorrats einstellen. Der Komparator 43 liefert der Steuerung des Antriebsmotors 15 die Kommandos: Laufen oder Anhalten.The sensors S consist of transmitters D7, D8 and D9 and receiver elements T1, T2 and T3, which preferably work with infrared light. The sensors, the receivers and operational amplifiers 20, 21 and 22 cooperating with them connected together to a constant voltage source. The received infrared radiation generates a photo current, which is the voltage across the working resistors influenced. The voltages are amplified in the operational amplifiers 20, 21 and 22. The outputs of the operational amplifiers 20, 21 and 22 are via a diode network connected to a central load resistor 40. The diodes are like this polarized that the positive voltages at the upper point of the Working resistance 40 and the negative voltages at the base of the Working resistance 40 arrive. A maximum is thus formed at the working resistor 40 Differential voltage between the maximum highest positive voltage and the maximum lowest negative voltage. The positive value is about one Amplifier 38, the negative value, however, via an amplifier 39 to a differential amplifier 41 headed. The voltage at the output of differential amplifier 41 corresponds to the proportional portion of the thread supply on the storage area. The Voltage at the output of differential amplifier 41 is via a diode and a resistor network fed to a comparator 43. On a potentiometer 44 leaves the nominal value of the thread supply is set. The comparator 43 provides control of the drive motor 15 the commands: run or stop.

Das Ausgangssignal eines Sensorelements S (D7, T1) wird am Operationsverstärker 20 zusätzlich über 14 abgegriffen und einem Schaltungsteil D sowie einem Parallelschaltungsteil E zugeführt.The output signal of a sensor element S (D7, T1) is on the operational amplifier 20 additionally tapped over 14 and a circuit part D and a parallel circuit part E fed.

Vom Punkt 23 führt eine Leitung 24 zu einem Eingang eines Komparators 26, dessen anderer Eingang an ein einstellbares Schwellwertglied 27 angeschlossen ist. Der Ausgang des Komparators 26 ist an eine Verknüpfungs- bzw. Überwachungseinrichtung V angeschlossen, die vorzugsweise in einen Mikroprozessor M integriert ist. Daran angeschlossen ist ein Warnsignalgeber 4 und gegebenenfalls ein Abschaltglied 11. Der Parallelschaltungsteil E zweigt am Punkt 23 mit einer Leitung 25 ab, die an einen Eingang eines zweiten Komparators 28 angeschlossen ist, dessen anderer Eingang mit einem zweiten Schwellwertglied 29 verbunden ist. Der Ausgang des zweiten Komparators 28 ist ebenfalls an die Einrichtung V angeschlossen. Das Schwellwertglied 27 ist auf einen niedrigen Schwellwert eingestellt, der, z.B., einem Signalpegel entspricht, unterhalb dessen, z.B. aufgrund verschlechterter Lichtübertragungsqualität, die Sensorvorrichtung 7 nicht mehr funktionsfähig ist. Das Schwellwertglied 29 ist hingegen auf einen höheren Schwellwert eingestellt, der eine gerade noch zulässige Verschlechterung der Lichtübertragungsqualität repräsentiert, bei der die Sensorvorrichtung noch ordnungsgemäß arbeiten kann, eine Beseitigung der die Lichtübertragungsqualität beeinträchtigenden Verschmutzungen jedoch schon angeraten ist.A line 24 leads from point 23 to an input of a Comparator 26, the other input of which is adjustable Threshold element 27 is connected. The output of the comparator 26 is to a linkage or monitoring device V connected, preferably in a microprocessor M is integrated. A warning signal generator is connected to it 4 and possibly a shutdown element 11. The parallel circuit part E branches at point 23 with a line 25 from connected to an input of a second comparator 28 is the other entrance with a second Threshold element 29 is connected. The exit of the second Comparator 28 is also connected to device V. The threshold value element 27 is at a low threshold value which corresponds, for example, to a signal level, below that, e.g. due to deteriorated light transmission quality, the sensor device 7 is no longer functional is. The threshold value element 29, however, is on one higher threshold value set, which is just a permissible Represents deterioration in light transmission quality, where the sensor device is still working properly can, an elimination of the light transmission quality impairing soiling is advised is.

In dem Schaltungsteil D wird aus dem Ausgangssignal ein die Geschwindigkeit der Trommel 1 repräsentierendes Drehzahlsignal erzeugt, das über die Einrichtung V im Mikroprozessor M anliegt und zur Auswertung herangezogen werden kann. Der Mikroprozessor vergleicht in einer Äquivalenzlogik das Vorhandensein beider Signale aus den Komparatoren 28 und 26. Werden beide Signale ungleich bzw. bleibt eines der Signale aus, so ist Alarm zu geben. In the circuit part D from the output signal Speed representing drum 1 speed signal generated that via the device V in the microprocessor M is present and can be used for evaluation. The microprocessor compares the existence in an equivalence logic both signals from the comparators 28 and 26. Are both signals unequal or one of the signals is missing, see above the alarm must be given.

Ein Prüfsignal wird synchron und im wesentlichen zeitgleich und mit gleichem Signalpegel gebildet wie das Ausgangssignal. Da jedoch das Schwellwertglied 29 auf einen höheren Schwellwert eingestellt ist als das Schwellwertglied 27, bleibt das Prüfsignal an der Einrichtung V aus, sobald sein Pegel unter den Schwellwert abfällt. Mittels des Mikroprozessors M wird der Signalgeber 4 aktiviert, um, vorzugsweise, ein optisches oder akustisches Signal abzugeben. Werden die Verschmutzungen nicht beseitigt, dann kann der Mikroprozessor M bei Ausbleiben auch des Drehzahlsignals das Abschaltglied 11 aktivieren und die Fadenliefervorrichtung und die Textilmaschine abstellen, um ggfs. ein Leeren der Trommel 1 zu vermeiden.A test signal becomes synchronous and essentially at the same time and formed with the same signal level as the output signal. However, since the threshold value element 29 has a higher threshold value is set as the threshold 27, it remains Test signal on the device V off as soon as its level below the threshold drops. By means of the microprocessor M the signal generator 4 activates, preferably, an optical one or emit an acoustic signal. Will the pollution not eliminated, then the microprocessor M can fail also activate the shutdown element 11 of the speed signal and turn off the thread delivery device and the textile machine, to avoid emptying the drum 1 if necessary.

Fig. 4 verdeutlicht eine Variation des Schaltungsteils D und des Parallelschaltungsteils E. In der Leitung 14 ist ein Spannungsteiler aus Widerständen 32, 33, 34 vorgesehen. Im Punkt 35 zwischen den Widerständen 32 und 33 zweigt die Leitung 24 zu einem Eingang des Komparators 26 ab. Vom Punkt 37 zwischen den Widerständen 33 und 34 zweigt hingegen die Leitung 25 zu einem Eingang des zweiten Komparators 28 ab. Der Signalpegel (Spannungspegel) aus dem Ausgangssignal am Punkt 37 (Prüfsignal) ist niedriger als am Punkt 35. Der jeweils andere Eingang des ersten und des zweiten Komperators 26, 28 ist an ein gemeinsames Schwellwertglied 36 angeschlossen, das auf einen bestimmten Schwellwert eingestellt ist (eine Referenz-Spannung). Der Schwellwert 36 ist genau auf den Punkt eingestellt, an welchem die Verschmutzung einen gerade noch zulässigen, für den Signalpegel des Prüfsignals aber zu hohen Grenzwert erreicht. Durch den Spannungsteiler 32, 33 und 34 schaltet der Komparator 28 bei einer höheren Schwelle als der Komparator 26. Ist die Sensorvorrichtung entsprechend verschmutzt, so kann der Komparator 28 nicht mehr durchschalten. Durch die Äquivalenzprüfung der Ausgangsspannungen der Komparatoren 26, 28 wird im Mikroprozessor M festgestellt, daß ein Warnsignal auszugeben ist. Der Warnsignalgeber 4 wird aktiviert. Fig. 4 illustrates a variation of the circuit part D and of the parallel circuit part E. In line 14 is a Voltage divider provided from resistors 32, 33, 34. in the Point 35 between resistors 32 and 33 branches the line 24 to an input of the comparator 26. From point 37 however, the line branches between resistors 33 and 34 25 to an input of the second comparator 28. The Signal level (voltage level) from the output signal at the point 37 (test signal) is lower than at point 35. The respective other input of the first and second comparators 26, 28 is connected to a common threshold element 36 which is set to a certain threshold (a reference voltage). The threshold 36 is exactly on point set, at which the pollution just barely permissible, but too high for the signal level of the test signal Limit reached. Through the voltage divider 32, 33 and 34 the comparator 28 switches at a higher threshold than that Comparator 26. If the sensor device is contaminated accordingly, so the comparator 28 can no longer switch through. By checking the equivalency of the output voltages of the comparators 26, 28 is determined in the microprocessor M that a Warning signal is to be issued. The warning signal generator 4 is activated.

Zum besseren Verständnis dieser Prüfroutine ist auf die Figuren 5, 5A, 5B und 5C verwiesen. Fig. 5 verdeutlicht in einem U/t-Diagramm das Objekt-Ausgangssignal 38' in der Leitung 14, wie es durch den Sensor S, D7, T1 in Abängigkeit vom Durchgang der Umfangsabschnitte 8, 9 bzw. der voneinander verschiedenen Oberflächenbereiche A, B erzeugt wird. Bei den beiden ersten Signalpegeln ist die Lichtübertragungs-qualität noch einwandfrei. Ab dem dritten Signalpegel nimmt in Fig. 5 die Qualität der Lichtübertragung ab. In der Steuerschaltung L gemäß Fig. 3 liegt - wie in dem Diagramm der Fig. 5A dargestellt - ein Signal 39' an. Der am Schwellwertglied 27 eingestellte Schwellwert ist mit U1 angedeutet. Am Ausgang des Komparators 26 ergibt sich eine Signalfolge C gemäß Fig. 5C. Am Ausgang des Komparators 28 ergibt sich hingegen eine Signalfolge G gemäß Fig. 5C. Ab dem Zeitpunkt X ist die Signalfolge G nicht mehr vorhanden. Eine Prüfung auf Gleichheit der Signalfolgen ergibt eine logische Signalfolge H in Fig. 5C. Zum Zeitpunkt X aktiviert der Mikroprozessor M das Wamsignalglied 4.For a better understanding of this test routine, refer to Figures 5, 5A, 5B and 5C referred. 5 illustrates the object output signal 38 'in a U / t diagram. in line 14, as determined by sensor S, D7, T1 depending on the passage of the circumferential sections 8, 9 or of the different surface areas A, B is generated. The light transmission quality is at the first two signal levels still flawless. From the third signal level in Fig. 5 the quality of the Light transmission off. 3 - as in the diagram 5A - a signal 39 'on. The one set on the threshold 27 Threshold is indicated by U1. At the output of the comparator 26 results a signal sequence C according to FIG. 5C. At the output of the comparator 28 results however, a signal sequence G according to FIG. 5C. From time X, the signal sequence is G not available anymore. A check for the equality of the signal sequences results in a logical one Signal sequence H in Fig. 5C. At time X, the microprocessor M activates this Doubletree 4.

Der Schwellwert U2 repräsentiert eine gerade noch zulässige Verschlechterung der Abtastverhältnisse, d.h. der Lichtübertragungsqualität, bei der die Sensorvorrichtung 7 noch ordnungsgemäß arbeitet, wie durch das in Fig. 5A unten angedeutete, auch nach dem Zeitpunkt X noch anliegende Signal 39' und die Signalfolge C in Fig. 5C verdeutlicht ist. Dabei ist darauf hinzuweisen, daß die Lichtübertragungsqualität sich normalerweise innerhalb einer wesentlichen längeren Zeitspanne verschlechtert, als sie aus den Fig. 5, 5A, 5B, 5C ableitbar ist. Diese Figuren sind bezüglich der Zeitspanne zum besseren Gesamtverständnis nur als schematisch anzusehen.The threshold value U2 represents a just acceptable deterioration of the Sampling ratios, i.e. the light transmission quality at which the sensor device 7 still working properly, as indicated by the one in Fig. 5A below signal 39 'still present after time X and signal sequence C in FIG. 5C is made clear. It should be noted that the light transmission quality usually deteriorates within a significantly longer period of time than it can be derived from FIGS. 5, 5A, 5B, 5C. These figures are in terms of time To be better understood as a schematic only.

Das Diagramm gemäß Fig. 5B gehört zur Variante gemäß Fig. 4. Unten in Fig. 5B ist ein Signal 39" entsprechend dem Signal 39' der Fig. 5A vorhanden. Der Schwellwert U1 entspricht dem Schwellwert U1 der Fig. 5A. Oben in Fig. 5B ist erkennbar, wie aufgrund des Spannungsteilers die Signalpegel eines aus dem Objekt-Ausgangssignal 38' abgeleiteten Prüfsignals 40" jeweils entsprechend niedriger sind als die Signalpegel des Signals 39", wobei jedoch für das Prüfsignal 40" derselbe Schwellwert U1 berücksichtigt wird, wie für das Signal 39". Die ersten drei Signalpegel des Prüfsignals 40" sind noch ausreichend hoch, um den zweiten Komperator 28 zu passieren. Der vierte Signalpegel ist jedoch niedriger als der Schwellwert U1, so daß dann an der Verknüpfungseinrichtung V das Prüfsignal 40" ausbleibt und das Warnsignal erzeugt wird.The diagram according to FIG. 5B belongs to the variant according to FIG. 4. Below is FIG. 5B a signal 39 "corresponding to signal 39 'of FIG. 5A is present. The threshold U1 corresponds to the threshold value U1 of FIG. 5A. It can be seen at the top in FIG. 5B that how due to the voltage divider the signal level from the object output signal 38 'derived test signal 40 "are respectively lower than the signal levels of signal 39 ", but the same for test signal 40" Threshold value U1 is taken into account as for signal 39 ". The first three signal levels of the test signal 40 "are still high enough to close the second comparator 28 happen. However, the fourth signal level is lower than the threshold value U1, so that then the test signal 40 "does not appear at the logic device V and the warning signal is produced.

Mittels des Schaltungsteils D und des Parallelschaltungsteils E und den darin angeordneten Komponenten wird eine Antivalenz-Kontrolleinrichtung zum Auswerten des Übereinstimmens des Prüfsignals mit dem Drehzahlsignal geschaffen. Diese Antivalenz-Kontrolleinrichtung ist software-seitig einfach im Mikroprozessor M zu verwirklichen. Die Überprüfung der Qualität der Lichtübertragung wird nur dann durchgeführt, wenn der Antriebsmotor zum Ergänzen des Fadenvorrates angetrieben wird, weil bei stillstehender Trommel ohnedies die Sensorvorrichtung nur den Faden abtastet und die reflektierenden Stäbe R nicht sieht bzw. die Qualität der Reflektionslichtübertragung nicht zuverlässig beurteilen kann.By means of the circuit part D and the parallel circuit part E and the arranged therein An antivalence control device is used to evaluate the components Matching the test signal with the speed signal created. This antivalence control device can be easily implemented in the microprocessor M on the software side. The quality of the light transmission is only checked if if the drive motor is driven to supplement the thread supply, because at idle drum anyway the sensor device only scans the thread and the reflective rods R does not see or the quality of the reflection light transmission cannot judge reliably.

Das Verfahren läßt sich auch bei anderen physikalischen Abtastprinzipien verwenden, z.B. bei einer Abtastung mittels Schall, Induktion, Magnetismus, Kapazität oder dgl.The method can also be used with other physical scanning principles, e.g. when scanning using sound, induction, magnetism, capacitance or the like.

Claims (14)

  1. A method for monitoring the scanning conditions when controlling a yarn feeding device (F) which comprises a storage surface (2) for a yarn (Y) stored in windings in a yarn supply (5) for feeding purposes, a drive motor (15) for replenishing the yarn supply by winding up yarn, a sensor device (7) oriented with at least one sensor (S) towards a scanning zone (12) provided in the yarn feeding device (F), and a control circuit (L) connected to the sensor device, in which method the sensor generates an object output signal (38') for controlling the drive motor (15) in response to the motion or the presence or absence of an object (5, 8, 9) in the scanning zone, the signal level of the object output signal (38') depending on the quality of the scanning conditions, and in which an alarm signal can be generated when the scanning conditions deteriorate, characterized in that a substantially synchronous test signal (40', 40") is provided on the basis of the object output signal (38'), that the signal level of said test signal is compared with an alarm threshold (U1, U2) representative of a deterioration of the scanning conditions which is just still acceptable, and that the alarm signal is generated when the signal level of the test signal (40', 40") falls below the alarm threshold value.
  2. A method according to claim 1, characterized in that the alarm signal is formed on the basis of the result of a monitoring of the test signal (40, 40") compared with the alarm threshold value (U1, U2) and of the object output signal (38'), preferably as soon as the monitoring result determined shows that the test signal compared with the alarm threshold value fails to appear, whilst the object output signal still appears.
  3. A method according to claim 1 or 2, characterized in that, when the absence of the yarn supply (5) in the scanning zone (12) is detected by means of the sensor device (7), the storage surface (2) is rotatingly driven by the drive motor (15), and that a signal (39', 39") representative of the rotational speed of the storage surface (2) and the test signal (40', 40") are formed on the basis of the object output signal (38') of the sensor (S) of the sensor device.
  4. A method according to at least one of the claims 1 to 3, characterized in that with essentially equal signal levels of the signal (39') and of the test signal (40'), the signal level of the test signal (40') is compared with a higher threshold value (U2) representative of the deterioration of the scanning conditions which is just still acceptable and the signal level of the signal (39') is compared with a lower threshold value (U1) representative of a deterioration of the scanning conditions which is no longer acceptable, and that in the absence of the test signal (40') the alarm signal is generated and in the absence of the signal (39') a switch-off signal is generated.
  5. A method according to at least one of the claims 1 to 3, characterized in that the test signal (40") is formed simultaneously with a signal level which is lower than the signal level of the signal (39"), and that both signal levels are compared with the same threshold value (U1).
  6. A method according to at least one of the claims 1 to 5, characterized in that the object is optoelectronically scanned in the scanning zone, and that the alarm signal is formed in response to a just still acceptable deterioration of the quality of light transmission at the sensor device (7).
  7. A yarn feeding device, in particular for use with knitting machines, comprising a housing (13), a storage surface (2) for a yarn supply, a controllable drive motor (15) for driving a winding element for supplying the yarn (Y) to a yarn supply consisting of several windings on the storage surface (2), a stationary, signal-generating sensor device (7) oriented towards at least one scanning zone (12) of the storage surface (2) and used for sensing the motion or the presence or absence of an object in the scanning zone (12), and a control circuit (L) which processes the object output signal (38') of the sensor device (7) and which is used for controlling the drive motor (15), said signal level of the object output signal (38') depending on the scanning conditions at the sensor device (7), characterized in that the control circuit (L) has associated therewith a parallel-circuit component (E) for generating and evaluating a test signal (40', 40") which is formed essentially synchronously on the basis of the object output signal (38'), and that the control circuit (L) is connected to an alarm signal emitter (4) which is adapted to be actuated in response to a change in the signal level of the test signal (40', 40") that represents a deterioration of the scanning conditions which is just still acceptable.
  8. A yarn feeding device according to claim 7, characterized in that the storage surface (2) is provided at a drum (1) which defines the winding element and which is adapted to be rotatably driven by the drive motor (15), said drum (1) having in the scanning zone (12) circumferentially offset surface areas (A, B, 8, 9) with clearly different scanning properties, that the surface areas (A, B, 8, 9) define the object sensed with respect to its motion by the sensor device (7) in the absence of the yarn (Y) in the scanning zone (12), that the object output signal (38') representative of the rotational speed of the drum (1) can be generated by the sensor device (7) during motion sensing of said surface areas (A, B), that the parallel-circuit component (E) comprises a threshold value member (36, 29) which provides a threshold value representative of a just still acceptable deterioration of the scanning conditions at the sensor device (7) and at at least one of the surface areas, and that in said parallel-circuit component (E) the test signal (40', 40") can be formed on the basis of the object output signal (38') essentially synchronously and can be compared with the threshold value (U1, U2) from the threshold value member for evaluation.
  9. A yarn feeding device according to claim 7, characterized in that the sensor device (7) is an optoelectronic sensor device which is adapted to be used for generating the object output signal (38') with a signal level depending on the light transmission quality in the sensor device (7).
  10. A yarn feeding device according to claim 7, characterized in that the control circuit (L) has associated therewith a circuit component (D) for deriving from the object output signal (38') a signal (39', 39") representative of the speed, that the circuit component (D) and the parallel-circuit component (E) are jointly connected to a signal-processing combining and monitoring device (V), preferably a microprocessor (M), and that the device (V) is provided with a program routine within which the alarm signal emitter (4) is actuable when the signal (39', 39") appears and when the test signal (40', 40") fails to appear.
  11. A yarn feeding device according to claim 10, characterized in that the combining and monitoring device (V) is connected to a switch-off member (11) which is actuable within said program routine as soon as in the activated state of the drive motor (15) also the signal (39', 39") fails to appear.
  12. A yarn feeding device according to at least one of the claims 7 to 10, characterized in that the circuit component (D) and the parallel-circuit component (E) are jointly connected to a voltage divider, that the circuit component (D) is connected to an input of a first comparator (26) whose output is connected to the combining and monitoring device (V) and whose other input is connected to a first threshold value member (27) set for a low threshold value (U1), preferably a first reference voltage, and that the parallel-circuit component (E) is connected to an input of a second comparator (28) whose output is also connected to the combining and monitoring device (V) and whose other input is connected to a second threshold value member (29) set for a higher threshold value (U2), preferably a second reference voltage.
  13. A yarn feeding device according to at least one of the claims 7 to 11, characterized in that a voltage divider (32, 33, 34) is provided for the object output signal (38'), said voltage divider (32, 33, 34) having connected thereto the circuit component (D) upstream of a resistor (33) and the parallel-circuit component (E) downstream of said resistor (33), that the circuit component (D) is connected to an input of a first comparator (26) whose output is connected to the combining and monitoring device (V), that the parallel-circuit part (E) is connected to an input of a second comparator (28), an output of which is also connected to said device (V), and that the second inputs of the comparators (26, 28) are connected to a common threshold value member (36) set for only one threshold value (U1), preferably a single reference voltage.
  14. A yarn feeding device according to at least one of the claims 7 to 13, characterized in that the sensor device (7) is provided with a plurality of single sensors (S), preferably single optoelectronic sensors, which are offset in the circumferential and rotational direction of the drum (1), said single sensors (S) comprising each a transmitter (D7, D8, D) and a receiver element (T1, T2, T3) associated with the respective transmitter, and that the circuit component (D) and the parallel-circuit component (E) are connected to only one of said single sensors (S).
EP96942317A 1995-12-08 1996-12-03 Method for monitoring scanning conditions during control of a yarn feeder Expired - Lifetime EP0868382B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19545891A DE19545891A1 (en) 1995-12-08 1995-12-08 Method for monitoring the scanning ratios when controlling a thread delivery device
DE19545891 1995-12-08
PCT/EP1996/005383 WO1997021620A1 (en) 1995-12-08 1996-12-03 Method for monitoring scanning conditions during control of a yarn feeder

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EP0868382A1 EP0868382A1 (en) 1998-10-07
EP0868382B1 true EP0868382B1 (en) 2000-05-03

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EP (1) EP0868382B1 (en)
KR (1) KR100303145B1 (en)
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DE (2) DE19545891A1 (en)
TW (1) TW308614B (en)
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WO1997021620A1 (en) 1997-06-19
CN1103734C (en) 2003-03-26
DE59605149D1 (en) 2000-06-08
EP0868382A1 (en) 1998-10-07
KR100303145B1 (en) 2001-12-12
CN1207083A (en) 1999-02-03
TW308614B (en) 1997-06-21
DE19545891A1 (en) 1997-06-12
US6125663A (en) 2000-10-03
KR19990071981A (en) 1999-09-27

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