US3930205A - Arrangements for automatically adjusting correct reference values for yarn faults in electronic yarn cleaners - Google Patents

Arrangements for automatically adjusting correct reference values for yarn faults in electronic yarn cleaners Download PDF

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Publication number
US3930205A
US3930205A US227509A US22750972A US3930205A US 3930205 A US3930205 A US 3930205A US 227509 A US227509 A US 227509A US 22750972 A US22750972 A US 22750972A US 3930205 A US3930205 A US 3930205A
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United States
Prior art keywords
comparator
yarn
arrangement
voltage
common point
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Expired - Lifetime
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US227509A
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English (en)
Inventor
Kurt Aeppli
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Zellweger Uster AG
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Zellweger Uster AG
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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
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/06—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to presence of irregularities in running material, e.g. for severing the material at irregularities ; Control of the correct working of the yarn cleaner
    • B65H63/062—Electronic slub detector
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • Yarn cleaners having electromagnetic yarn cutters have been used to remove blemishes and other defects from yarns during spooling operations by severing the yarns.
  • Yarn cleaners are used with textile winding machines of any type and serve to scan the yarn for uniformity and in the presence of an irregularity, such as constrictions, thickened portions, slubs, etc., delivers a control signal which is employed for cutting the yarn or for automatically cleaning the yarn at the location of the irregularity.
  • Electronic yarn cleaners necessitate a relatively accurate preadjustment of different parameters if they are to have the required cleaning effect. These parameters vary in dependence upon the measuring principle applied; that is, in capacitive yarn cleaners, allowance has to be made for material and moisture, while in the case of optical yarn cleaners, allowance has to be made for material, color, surface or twist.
  • the present invention satisfies this need and provides a circuit arrangement for automatically adjusting correct reference values for yarn faults in electronic yarn cleaners, in which the outputs of the amplifiers of at least two yarn cleaners are connected together through a switch and a resistance and are applied to the input of a comparator which acts through a regulating device to change the degree of amplification of all the yarn cleaners in the sense that the voltage values at its input are directed towards a predetermined ideal value.
  • the comparator generates a reference voltage which corresponds to the particular reference value and with which the voltage value present at its input is compared.
  • a regulator is controlled, increasing or reducing in stages the amplification of the connected yarncleaner amplifiers.
  • the input of the comparator is preceded with advantage by a resistance-capacitor section which acts as a low-pass filter and which smooths the basically undulating signals arriving from the yarncleaner amplifiers.
  • the circuit arrangement according to the invention is coupled to an indicator designed to show three phases of the input signal, for example, by means of indicating lights, as follows: (1) When the input signal corresponds to the reference voltage within predetermined limits, there is no readjustment of amplification and a first light signal is illuminated. (2) When the input signal is smaller than the reference voltage, amplification is increased by one stage and a second light signal is illuminated. (3) When the input signal is greater than the reference voltage, amplification is reduced by one stage and a third light signal is illuminated.
  • the arrangement illustrated in the drawing includes yarn-cleaner amplifiers l, 1", l" which have inputs connected to the detection portion of the respective yarn cleaners (not shown) and outputs providing the voltage values U U U,, connected to the operational portion of the cleaners (also not shown) and to the switches .2, 2" 2". These switches can be actuated either manually or automatically in conjunction with a mechanism for switching on a winding station.
  • the switches 2, 2" 2" connect the outputs of all the amplifiers to a common point 4 through respective resistances 3', 3" 3".
  • the common point 4 is connected to an adjusting unit 5 in which a capacitor 6 connected between point 6 and ground initially smooths the input signals.
  • the adjusting unit 5 further includes a comparator 7 and a regulator 8.
  • a reference voltage which can be preselected by means of an adjusting member (not shown in detail) is applied to and compared with the input voltage in a comparator 7.
  • the adjusting member may take the form of a potentiometer 7' connected to a voltage source and having its adjustable tap connected to the second input of the comparator.
  • the resulting difference in voltage triggers a regulator 8 which, depending upon the polarity of the differential signal, transmits to a lead 9 an electrical voltage value which determines the amplification or gain of the yarn-cleaner amplifiers l, l" I".
  • the regulator 8 can be in the form of, for example, a voltage divider whose tap is driven by a motor to an extent and direction dependent upon the size and polarity of the differential signal.
  • the amplifiers I, l" I" are conventional amplifiers of thetype wherein the amplification factor is adjustable in response to.an applied control signal, i.e., a so-called variable'gain amplifier.
  • the differential signal can be additionally delivered by a lead l0.to an indicator board 11 having, for example, three indicators, such as signal lamps l2, l3, and 14, of which oneis provided for correct adjustment, a second for deviations to one side and .a third for deviations to the other side of the correct adjustment.
  • an indicating instrument in which the particular operational state of all the yarn cleaners connected to the point 4 can be recognized from the position of the pointer.
  • the circuit arrangement of the invention operates as follows: After a yarn has been inserted into one-of the yarn cleaners and the winding station subsequently started up, the switch 2 associated with the particular yarn .cleaner is closeduntil the comparator 7 has determined the difference, if any, between the measured voltage value derived from point '4 at the output of the amplifiers and the reference voltage and has adjusted the regulator'8 accordingly. After this testing operation, the switch 2 is reopened and the winding station continues to run withthe same degree of amplification to which it has been preadjusted. Only after another yarn has been inserted, whether at the same winding station or at a different winding station, is monitoring repeated through closure of the switch 2 associated with thatparticular winding station.
  • the reference least two yarn cleaners each having a variable gain amplifier providing an output control signal, a respective switch and resistance connected in series to the output of each amplifier and to a common point, comparator means for comparing the voltage at said common point with a reference voltage, and regulating means for regulating the gain of all of said amplifiers collectively in accordance with the difference between said reference voltage and the voltage at said common point as provided by said comparator means.
  • said comparator'means includes adjusting means for selectively adjusting the value of said reference voltage:
  • said adjusting means includes a potentiometer providing said adjustable reference voltage.
  • said regulating means includes a voltage divider having a movable tap providing a regulating signal for said amplifiers and 'means for adjusting the position of said tap in response to theoutput of said comparator.
  • An arrangement as claimed in claim 5, .further including indicating means connected to said comparator for indicating various ranges of deviation of the voltage at said common point from said reference voltage.
  • said indicating means includes a pluralityof indicators selectively energized to show the particular condition of the yarn in relation tothe reference value adjusted in said comparator means.
  • said regulating means includes a voltage divider having a movable tap providing a regulating signal for said amplifiers and means for adjusting the position of said tap in response to the output of said comparator.
  • An arrangement as claimed inclaim 1 further including indicating means connected to said comparator for indicating various ranges of deviation of the voltage at said common point from said reference voltage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
US227509A 1971-02-19 1972-02-18 Arrangements for automatically adjusting correct reference values for yarn faults in electronic yarn cleaners Expired - Lifetime US3930205A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH242771A CH527761A (de) 1971-02-19 1971-02-19 Schaltungseinrichtung zur automatischen Anpassung des Verstärkungsgrades von Garnreinigern an einen vorgehbaren Sollwert, an einer aus mindestens zwei elektronischen Garnreinigern bestehenden Anordnung

Publications (1)

Publication Number Publication Date
US3930205A true US3930205A (en) 1975-12-30

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ID=4233547

Family Applications (1)

Application Number Title Priority Date Filing Date
US227509A Expired - Lifetime US3930205A (en) 1971-02-19 1972-02-18 Arrangements for automatically adjusting correct reference values for yarn faults in electronic yarn cleaners

Country Status (10)

Country Link
US (1) US3930205A (enrdf_load_stackoverflow)
JP (1) JPS5034660B1 (enrdf_load_stackoverflow)
AT (1) AT315686B (enrdf_load_stackoverflow)
BE (1) BE778111A (enrdf_load_stackoverflow)
CH (1) CH527761A (enrdf_load_stackoverflow)
CS (1) CS167344B2 (enrdf_load_stackoverflow)
DE (1) DE2200441C3 (enrdf_load_stackoverflow)
FR (1) FR2131309A5 (enrdf_load_stackoverflow)
GB (1) GB1376752A (enrdf_load_stackoverflow)
HK (1) HK64378A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4315222A (en) * 1980-03-06 1982-02-09 Bell Telephone Laboratories, Incorporated Power combiner arrangement for microwave amplifiers
US5181374A (en) * 1989-08-31 1993-01-26 Zellweger Uster Ag Method for setting the sensitivity limits of electronic yarn clearers, and device for carrying out the method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2404136C3 (de) * 1973-02-05 1984-06-28 Gebrüder Loepfe AG, Wetzikon Einrichtung zum Einstellen der Reinigungsgrenzen eines elektronischen Fadenreinigers
EP1260476B1 (de) * 2001-05-22 2004-09-22 Gebrüder Loepfe AG Verfahren zum Prüfen der Qualität eines Garns

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497883A (en) * 1943-01-28 1950-02-21 Sperry Corp Electronic computer
US3048817A (en) * 1958-01-16 1962-08-07 Phillips Petroleum Co Gain control amplifier
US3434065A (en) * 1967-03-17 1969-03-18 Hewlett Packard Co Automatic-gain-controlled amplifier having a level indicator
US3488604A (en) * 1967-09-01 1970-01-06 Sperry Rand Corp Automatic pulsed-signal amplitude normalizer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2497883A (en) * 1943-01-28 1950-02-21 Sperry Corp Electronic computer
US3048817A (en) * 1958-01-16 1962-08-07 Phillips Petroleum Co Gain control amplifier
US3434065A (en) * 1967-03-17 1969-03-18 Hewlett Packard Co Automatic-gain-controlled amplifier having a level indicator
US3488604A (en) * 1967-09-01 1970-01-06 Sperry Rand Corp Automatic pulsed-signal amplitude normalizer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4315222A (en) * 1980-03-06 1982-02-09 Bell Telephone Laboratories, Incorporated Power combiner arrangement for microwave amplifiers
US5181374A (en) * 1989-08-31 1993-01-26 Zellweger Uster Ag Method for setting the sensitivity limits of electronic yarn clearers, and device for carrying out the method

Also Published As

Publication number Publication date
FR2131309A5 (enrdf_load_stackoverflow) 1972-11-10
GB1376752A (en) 1974-12-11
AT315686B (de) 1974-06-10
BE778111A (fr) 1972-05-16
DE2200441C3 (de) 1978-04-06
CH527761A (de) 1972-09-15
DE2200441A1 (de) 1972-08-31
JPS5034660B1 (enrdf_load_stackoverflow) 1975-11-10
HK64378A (en) 1978-11-10
CS167344B2 (enrdf_load_stackoverflow) 1976-04-29
DE2200441B2 (de) 1977-08-11

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