US3438189A - Monitoring device for textile machines for determining interruptions at moving fiber strands or the like - Google Patents

Monitoring device for textile machines for determining interruptions at moving fiber strands or the like Download PDF

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Publication number
US3438189A
US3438189A US642084A US3438189DA US3438189A US 3438189 A US3438189 A US 3438189A US 642084 A US642084 A US 642084A US 3438189D A US3438189D A US 3438189DA US 3438189 A US3438189 A US 3438189A
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Prior art keywords
monitoring device
feeler
measuring
signal
fiber
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US642084A
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English (en)
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Hermann Gasser
Stephan Wuest
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Luwa Ltd
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Luwa Ltd
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/14—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements
    • D01H13/16—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material
    • D01H13/1616—Warning or safety devices, e.g. automatic fault detectors, stop motions ; Monitoring the entanglement of slivers in drafting arrangements responsive to reduction in material tension, failure of supply, or breakage, of material characterised by the detector
    • D01H13/1633—Electronic actuators
    • D01H13/1641—Capacitor sensing means

Definitions

  • the present invention relates to an improved monitoring device for textile machines which serves to determine interruptions or the like (as such term will be more fully defined hereinafter) at moving fiber strands by means of one or more capacitive measuring feelers connected with an amplification and evaluation circuit.
  • an impact member is provided which extends transversely to the air current. This impact member is placed into mechanical oscillation upon impact of the ruptured pieces of the fiber strand. These oscillations are electromagnetically or electrostatically transformed into an appropriate electrical signal.
  • Another proposed solution relates to the actual arrangement of the electrodes in the air channel. The electrodes are electrostatically charged with respect to the channel wall, so that contact by the passing fiber particles brings about a partial discharge or change in charge of the electrodes which produces a signal in an external current circuit.
  • An improvement of this technique resides in the arrangement of an air condenser as a measuring feeler in the suction channel.
  • the relevant fiber particles or portions then act as a dielectric and, therefore, change the capacitance.
  • the capacitor, together with a coil forms an electric oscillating circuit, the changed resonance characteristics of which is then determined.
  • capacitive measuring feelers are required having electrode arrangements which obstruct the suction air current as little as possible.
  • the time-curve and the shape of the produced signals should be capable of being precisely determined, so that the monitoring device, on the basis of an analysis of the signals undertaken at an evaluation circuit, is capable of responding only to the really interesting situations. This is particularly important since, in a roving frame, for example, particles of different origin are conveyed through the measuring feeler and determine the form or shape of the signal in the following manner:
  • fiber strand not only encompasses a strand with a more or less round crosssection, but also includes a sliver or a relatively wide and flat fiber layer or mat (web). Additionally, the expression interruptions or any equivalent thereof, should not be limited to the situation where a fiber strand is torn or broken during passage through the textile machine. This expression is to be understood in a far broader sense. In certain situations there must also be determined the actual end of a strand.
  • the present invention provides for an exact determination and careful amplification of the electric signals appearing at the measuring feeler.
  • Capacitive-type measuring feelers are already known in the textile art and also in other environments such as in so-called yarn cleaners which serve to eliminate undesired yarn irregularities or thickened portions or in apparatuses for measuring and recording the yarn cross-section. With such feelers the momentary value of the feeler capacitance is continuously determined by means of a high frequency measuring technique.
  • the feeler is either coupled in a capacitance measuring bridge, or it is a component of a high frequency-oscillating circuit, the resonance frequency of which varies in accordance with changes in capacitance.
  • the feeler current circuit must be supplied with a high frequency reference oscillation from an oscillator circuit. This requires a considerable expenditure so that the reference frequency remains sufficiently constant, and, in operation, difficulties occur with the precise dimensioning of the circuit components.
  • the instant inventive monitoring device utilizes one or more capacitive feelers and is characterized by the features that a high-impedance signal input circuit is provided by utilizing a field efiect transistor in the amplifier-input stage, and the measuring feeler or feelers which are connected in parallel with one another are also connected in series with a capacitor.
  • FIGURE 1 schematically illustrates the circuit diagram of an amplifier-input stage with the signal-input circuit of a preferred embodiment of the inventive monitoring device
  • FIGURE 2 schematically depicts two different arrangements of monitoring devices at a roving or fly frame
  • FIGURE 3 schematically depicts a further arrangement of a monitoring device and a feeler at the region of the flyer head at a roving frame or spinning machine.
  • a field effect transistor with the electrodes G (gate), S (source) and D (drain) serves as the amplifier element.
  • the path S-D of the transistor 10 exhibits a variable resistance which is dependent upon the internal field intensity determined by the potential at the control electrode G.
  • the control electrode G, together with the controlled path S-D merely forms a capacitance, there being negligible leakage therebetween,
  • the supply for the circuit is a non-illustrated directcurrent source connected via the plus conductor or lead 26, with the minus conductor 27 being connected to ground.
  • Element C20 is a filter condenser for removing any remaining alternating current-voltage components in the operating direct current-voltage.
  • the path S-D of the transistor 10 is provided between the resistors R12 and R13, the amplified output signal from the transistor being removed at the working resistor R12 and delivered via the conductor 22 to the next stage of the amplifier and evaluation circuit.
  • the resistors R14 and R16 form a voltage divider, the potential at the junction or point 23 being carried via a high ohm resistor R15 to the control electrode G.
  • this control electrode G receives a positive biasing potential and the operating point of the field elfect transistor 10 is determined.
  • a capacitor C19 connected between the electrode S and the point 23, provides a feed-back path in that it delivers or conducts the signal appearing across the resistor R13 to the control electrode G in opposite phase to the input signal.
  • a capacitor C17 with a capacitive measuring feeler 21 connected in series is disposed in the signal input circuit between the control electrode G and the ground conductor. In the event that a number of capacitive measuring feelers 21 are desired, they are connected in parallel to one another by means of the measuring conductors 24, 25 as indicated.
  • the signal input circuit is polarized by the potential diiference between the positive biased electrode G and ground.
  • the capacitive measuring feeler 21 one is concerned with a capacitor of variable capacitance.
  • the changes in capacitance are preferably brough about by fiber strand particles or flocks moving in the electric field producing changes in the capacitor dielectric.
  • the signal appearing at the feeler 21, or the feelers as the case may be is coupled via the series capacitor C17 with the control electrode G, and the amplified output signal is removed via the resistor R12. Since the resistors between the control electrode G and the controlled path S-D of the field effect transistor are of high ohmic value, no appreciable current flow is possible from the input circuit to the remainder of the device. Thus, when a signal is impressed at the input circuit, a change of charge of the input capacitance takes place rather than a true current flow. This capacitance is provided by the galvanic separation at the capacitor C17, as well as the separation of the measuring conductors 24, 25 themselves. a
  • the lowest frequency of response of the amplification is determined by the RC-member R15, C17.
  • the RC member is dimensioned in such a manner that gradual changes at the feelers, for instance, those brought about by variations in temperature, moisture or dust, and so forth, and those which extend for periods of time of several seconds and more are not transmitted to the control electrode G as actual signal variations.
  • the coupling relationship via capacitor C17 also increases with increasing signal frequency as the impedance decreases for a corresponding increase in frequency.
  • This capacitor functions as a high-pass filter so that signal components with frequencies of several cycles per second and upwards appear more strongly at the control electrode G, whereas lower frequencies are suppressed or removed.
  • the circuit selectively responds to different flank steepnesses of the signal impulses.
  • a subsequent nonillustrated evaluation circuit approximately as follows: At later preamplifier stages coupled via the conductor 22, there is connected a tripping stage (Schmitt trigger) which transforms the incoming signal impulses to square wave pulses, provided that the signal amplitude exceeds an adjustable threshold value. Accordingly, the previously mentioned disturbing peaks of the signal, brough about by the fly and so forth, are eliminated.
  • the square wave impulses are subsequently integrated in an integration stage to an increasing peak value.
  • this peak value exceeds a second threshold value within a predetermined period of time, a further tripping stage will respond, whereby a relay is energized so as to stop the machine or the spindle drive or to set off an alarm or the like. Consequently, a monitoring device is provided which does not respond to individual impulses caused by loose, short slubbing pieces. Rather, the device only responds to a series of pulses as such occur upon rupture of the slubbing.
  • the above generally described evaluation circuit which can be formed of known stages, is particularly suitable for the previously mentioned applications where, at each spinning location of a roving frame or the like, the slubbing traveling from the drafting frame to the flyer is to be monitored for rupture.
  • a pneumatic suction device which, in the event of rupture of the slubbing or the like, seizes the broken slubbing piece and wherein the capacitive feeler or feelers 21 are arranged in an air conduit of the suction installation.
  • Total capacitance of the measuring feeler and conductors are in the order of magnitude of several hundred pf.
  • the actual signal of the measuring feeler may be determined considerably independently of temperature and moisture fluctuations, vibrations and dust.
  • the circuit also enables the use of relatively long measuring conductors 24, 25 which increase the freedom of placement of the feelers at the machine. Since the feelers generally can be arranged closer to the rupture or suction locations, a quicker response time of the monitoring device is effected due to the shortening of the flight path of the broken slubbing pieces or the like to the feeler. This is of considerable importance with modern, high-speed machines.
  • FIGURE 2 schematically depicts the arrangement of a monitoring device in conjunction with a pneumatic suction installation at a roving or fly frame, wherein only a single spinning location of the machine has been illustrated.
  • This fiber strand 30 01' the like is pulled via a guide 32 into the drafting or drawing frame 33.
  • the fiber strand or slubbing 30 travels into the head of the rotating flyer 34 which winds the processed slubbing into a spool or package 35.
  • the fly frame is provided with a suction device, in which there are illustrated continuous suction-collecting channels 41 in cross-section and a suction nozzle 40.
  • Each spinning location or station is equipped with such a suction nozzle 40, and all of these nozzles are operably coupled with the collecting channel 41.
  • a negative pressure is maintained so that air is continuously withdrawn from the surrounding atmosphere at all of the nozzles.
  • the broken slubbing ends are displaced by the suction air current into the relevant nozzles and transported away through the collecting channel 41.
  • nozzle 40 As a general rule, not every nozzle 40 opens directly into the collecting channel 41. Rather, a number of nozzles, six for instance, are combined with a connecting tube 40' into a so-called suction pipe, wherein the connecting tube 40' initially opens into the connecting channel 41.
  • Each pipe for instance, has associated therewith a measuring feeler 21.
  • This is advantageously placed at the opening location of the connecting tube 40 with the collecting channel 41.
  • portions of the channel or tube walls can serve as the ground electrode, whereby such electrodes for all of the feelers are connected with one another via the machine frame, and so forth.
  • the counter-electrode of the feeler has the form of an isolated fixed needle 44. All fifteen feelers are then connected in parallel to an input circuit according to FIGURE 1 which, together with the entire amplifier and evaluation circuit, has been designated by reference numeral 46.
  • FIGURE 1 which, together with the entire amplifier and evaluation circuit, has been designated by reference numeral 46.
  • the placement of the feelers with regard to one or more amplifier and evaluation circuits can be differently selected depending upon requirements.
  • FIGURE 2 A further inventive monitoring device of a similar type is shown in FIGURE 2 in conjunction with a fiy frame. It might be desired, with a fly frame (or a different textile machine), to determine at the side of the infeed of the fiber strand or the fiber strands when an interruption occurs or when the can 31 (or a spool or the like) has become depleted.
  • a capacitive measuring feeler 21a is arranged at a spacing beneath each strand 30. Now, if the strand 30 at this side of the machine breaks or its supply is depleted, there results a hanging portion, as shown in phantom lines by reference numeral 30', whereby a strand portion arrives at the region of the feeler 21a and brings about a characteristic change in capacitance.
  • the feeler 21a or other similar type feelers, is connected with an input circuit of FIG- URE 1 contained in an amplifier and evaluation circuit 46a. The mentioned capacitance change determines an interruption.
  • FIGURE 3 A further construction of the inventive monitoring device is depicted in FIGURE 3.
  • a capacitive feeler 21b which is also connected to an amplifier and evaluation circuit 46b with an input stage according to FIGURE 1, is arranged at the region above or laterally of the head of a flyer 54.
  • the ground electrode of the feeler 21b is formed by portions of the fiyer 54, whereas the counterelectrode 54 is preferably formed as a needle or tip which is seated at an isolated holder 56 which can be tilted open, for example.
  • the electrode 55 is disposed somewhat eccentric to the axis 53 of the flyer 54.
  • a monitoring device in textile machines for determining interruptions of moving fiber strands comprising:
  • At least one capacitive measuring feeler means disposed at said textile machine, such that a moving fiber strand forms a portion of the dielectric of said measuring feeler means, said measuring feeler means exhibiting a change in capacitance in response to a change in said portion of said dielectric;
  • a field efiect transistor having an input signal circuit and an output amplification circuit
  • evaluation circuit means connected to said output amplification circuit for evaluating said change in capacitance.
  • a monitoring device in textile machines wherein said field effect transistor includes a control electrode connected in said input signal circuit; and resistor means connected to said control electrode for supplying biasing potential to said field effect transistor so as to determine the operating point of the control electrode, said series capacitor being connected between the control electrode of said field effect transistor and 4 said capacitive measuring feeler means for blocking said biasing potential from said feeler means.
  • a monitoring device in textile machines wherein said resistor means and said series capacitor provides a time constant circuit means for determining the lower boundary frequency of amplification response.
  • a monitoring device in textile machines wherein said textile machine includes a pneuma-tic suction device, said measuring feeler means being disposed in said suction device.
  • a monitoring device in textile machines wherein said pneumatic suction device includes a connecting tube opening into a suction-collecting channel, said measuring feeler means being arranged at the opening between said connecting tube and said channel.
  • measuring feeler means is located at an inlet side of said textile machine whereby said measuring feeler means monitors the presence of hanging portions of said fiber strands.
  • a monitoring device in textile machines includes a flyer having a head, said measuring feeler means being located in the region of said head of the flyer to determine collection of fiber material.
  • measuring feeler means comprises a needle-like electrode, isolated and fixedly arranged offset to said flyer axis.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Treatment Of Fiber Materials (AREA)
US642084A 1966-06-02 1967-05-29 Monitoring device for textile machines for determining interruptions at moving fiber strands or the like Expired - Lifetime US3438189A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH806866A CH474583A (de) 1966-06-02 1966-06-02 Verstärkereingangsschaltung für kapazitive Messfühler in einer Überwachungseinrichtung für Textilmaschinen

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US3438189A true US3438189A (en) 1969-04-15

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US642084A Expired - Lifetime US3438189A (en) 1966-06-02 1967-05-29 Monitoring device for textile machines for determining interruptions at moving fiber strands or the like

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US (1) US3438189A (enrdf_load_stackoverflow)
JP (1) JPS4929140B1 (enrdf_load_stackoverflow)
BE (1) BE699415A (enrdf_load_stackoverflow)
CH (1) CH474583A (enrdf_load_stackoverflow)
DE (1) DE1685886B1 (enrdf_load_stackoverflow)
ES (1) ES341883A1 (enrdf_load_stackoverflow)
GB (1) GB1131008A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3575612A (en) * 1968-05-31 1971-04-20 Rca Corp Fet control system employing a storage capacitor and switching tube means
US3634699A (en) * 1970-03-03 1972-01-11 Owens Corning Fiberglass Corp Condition-responsive control circuit
US3647940A (en) * 1970-12-01 1972-03-07 Leopold A Harwood Control system
US3968637A (en) * 1973-08-06 1976-07-13 Akzona Incorporated Yarn break detection by means of triboelectrical noise signal
US4078369A (en) * 1975-12-06 1978-03-14 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Maintaining supply of fiber material for textile spinning machines
US4095401A (en) * 1976-06-02 1978-06-20 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method and apparatus for stopping a flyer frame
US4359831A (en) * 1980-05-19 1982-11-23 De Lorean Manufacturing Company Reversibly powered rotary snow tiller
US4630434A (en) * 1984-02-22 1986-12-23 Skf Textilmaschinen-Komponenten Gmbh Roving blocking mechanism on draw frames of spinning machines
US4679117A (en) * 1982-03-25 1987-07-07 The Boeing Company Touch sensor for wire stripper
US4682272A (en) * 1984-09-28 1987-07-21 The Boeing Company Method of testing and adjusting a picofarad detecto circuit

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2625768C2 (de) * 1976-06-09 1985-07-25 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi Vorrichtung zum Stillsetzen des Antriebs eines Flyers
JPS53122828A (en) * 1977-04-01 1978-10-26 Aichi Spinning Co Method of and device for winding yarn under constant tension in bobbin lead spinning machine
DE3028453A1 (de) * 1980-07-26 1982-03-18 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Spinnmaschine
CN103225148B (zh) * 2013-05-10 2015-09-02 上海八达纺织印染服装有限公司 一种凉爽型纱线面料的纱线加工装置
CN108796712A (zh) * 2018-08-22 2018-11-13 安徽日发纺织机械有限公司 一种倍捻机断电预警及同步电路

Citations (10)

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Publication number Priority date Publication date Assignee Title
DE930559C (de) * 1953-08-14 1955-07-18 Ernst Dr-Ing Breuning Vorrichtung zum UEberwachen und Steuern von Textilmaschinen
US2950508A (en) * 1954-12-31 1960-08-30 Zellweger Uster Ag Method and apparatus for automatically controlling the weight per unit length of textile materials
US2956392A (en) * 1958-03-04 1960-10-18 Ohnishi Hiromu Break detection apparatus
US3043991A (en) * 1962-07-10 figure
US3099048A (en) * 1958-01-09 1963-07-30 Zellweger Uster Ag Apparatus for automatically controlling the drafting of elongate materials
US3114233A (en) * 1959-05-20 1963-12-17 Guri Antonio Viaplana Automatic electronic system for the control of sliver ruptures in roving frames
US3125708A (en) * 1964-03-17 H schutte
US3271823A (en) * 1963-11-29 1966-09-13 Ideal Ind Stop motion for textile fiber drafting machine
US3300585A (en) * 1963-09-04 1967-01-24 Northern Electric Co Self-polarized electrostatic microphone-semiconductor amplifier combination
US3309859A (en) * 1966-01-11 1967-03-21 James L Highsmith And Company Control system for textile roving frame

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE515640A (enrdf_load_stackoverflow) * 1951-11-19
FR1084314A (fr) * 1952-06-19 1955-01-18 Procédé et dispositif destinés à la surveillance et à la commande de machines textiles en case de casse de fil
DE911226C (de) * 1952-10-17 1954-05-10 Ernst Breuning Dr Ing Verfahren nebst Vorrichtung zum UEberwachen und Steuern der Fertigungsprozesse von Materialien mit geringem elektrischem Leitwert, insbesondere von Faserbaendern und Garnen
US2812632A (en) * 1953-03-10 1957-11-12 Pneumafil Corp Devices for detecting broken ends or strands on textile machinery
CH315287A (de) * 1953-04-27 1956-08-15 Luwa Ag Fadenbruch-Absauganlage mit einer Schalteinrichtung an einer Spinnereimaschine
DE925516C (de) * 1953-08-14 1955-03-24 Ernst Dr-Ing Breuning Vorrichtung zum UEberwachen und Steuern von Textilmaschinen, insbesondere Spinnmaschinen, in Abhaengigkeit von Fadenbruechen
AT205895B (de) * 1957-03-27 1959-10-26 Ernst Dr Breuning Vorrichtung zum Überwachen und Steuern von Textilmaschinen
DE1139997B (de) * 1959-09-11 1962-11-22 Zellweger A G Verfahren und Vorrichtung zur Fest-stellung und Beseitigung von fehlerhaften, spontanen Querschnittsaenderungen in Textilmaterial, insbesondere in Garnen, Vorgarnen und Baendern
BE676645A (enrdf_load_stackoverflow) * 1966-02-17 1966-07-18

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043991A (en) * 1962-07-10 figure
US3125708A (en) * 1964-03-17 H schutte
DE930559C (de) * 1953-08-14 1955-07-18 Ernst Dr-Ing Breuning Vorrichtung zum UEberwachen und Steuern von Textilmaschinen
US2950508A (en) * 1954-12-31 1960-08-30 Zellweger Uster Ag Method and apparatus for automatically controlling the weight per unit length of textile materials
US3099048A (en) * 1958-01-09 1963-07-30 Zellweger Uster Ag Apparatus for automatically controlling the drafting of elongate materials
US2956392A (en) * 1958-03-04 1960-10-18 Ohnishi Hiromu Break detection apparatus
US3114233A (en) * 1959-05-20 1963-12-17 Guri Antonio Viaplana Automatic electronic system for the control of sliver ruptures in roving frames
US3300585A (en) * 1963-09-04 1967-01-24 Northern Electric Co Self-polarized electrostatic microphone-semiconductor amplifier combination
US3271823A (en) * 1963-11-29 1966-09-13 Ideal Ind Stop motion for textile fiber drafting machine
US3309859A (en) * 1966-01-11 1967-03-21 James L Highsmith And Company Control system for textile roving frame

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3575612A (en) * 1968-05-31 1971-04-20 Rca Corp Fet control system employing a storage capacitor and switching tube means
US3634699A (en) * 1970-03-03 1972-01-11 Owens Corning Fiberglass Corp Condition-responsive control circuit
US3647940A (en) * 1970-12-01 1972-03-07 Leopold A Harwood Control system
US3968637A (en) * 1973-08-06 1976-07-13 Akzona Incorporated Yarn break detection by means of triboelectrical noise signal
US4078369A (en) * 1975-12-06 1978-03-14 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Maintaining supply of fiber material for textile spinning machines
US4095401A (en) * 1976-06-02 1978-06-20 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method and apparatus for stopping a flyer frame
US4359831A (en) * 1980-05-19 1982-11-23 De Lorean Manufacturing Company Reversibly powered rotary snow tiller
US4679117A (en) * 1982-03-25 1987-07-07 The Boeing Company Touch sensor for wire stripper
US4630434A (en) * 1984-02-22 1986-12-23 Skf Textilmaschinen-Komponenten Gmbh Roving blocking mechanism on draw frames of spinning machines
US4682272A (en) * 1984-09-28 1987-07-21 The Boeing Company Method of testing and adjusting a picofarad detecto circuit

Also Published As

Publication number Publication date
BE699415A (enrdf_load_stackoverflow) 1967-11-16
JPS4929140B1 (enrdf_load_stackoverflow) 1974-08-01
CH474583A (de) 1969-06-30
GB1131008A (en) 1968-10-16
DE1685886B1 (de) 1971-05-19
ES341883A1 (es) 1968-12-01

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