US3631354A - Apparatus for the automatic adjustment of a yarn cleaner - Google Patents

Apparatus for the automatic adjustment of a yarn cleaner Download PDF

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Publication number
US3631354A
US3631354A US11461A US3631354DA US3631354A US 3631354 A US3631354 A US 3631354A US 11461 A US11461 A US 11461A US 3631354D A US3631354D A US 3631354DA US 3631354 A US3631354 A US 3631354A
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United States
Prior art keywords
pulse
combination defined
output
circuit means
yarn
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Expired - Lifetime
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US11461A
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English (en)
Inventor
Hermann Werffeli
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Machinenfabrik Schweiter AG
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Machinenfabrik Schweiter 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
    • B65H63/065—Electronic slub detector using photo-electric sensing means, i.e. the defect signal is a variation of light energy
    • 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

  • Kleeman ABSTRACT An apparatus for the automatic adjustment of a yarn cleaner at a winding machine, such yarn cleaner embodying at least one measuring cell, an amplifier and a pulse shaper.
  • a signal feedback circuit electrically couples the output of the pulse shaper with the input of a control device which by means of its output signal brings about the adjustment of the amplification gain at the aforementioned amplifier.
  • the signal feedback circuit embodies a pulse evaluation circuit which serves to generate an average value signal from a predetermined number of signals appearing at the output side of the pulse shaper.
  • the present invention relates to a new and improved apparatus for the automatic adjustment of a yarn cleaner at a winding machine, this yarn cleaner being of the type incorporating at least one measuring cell, an amplifier and a pulse shaper.
  • All of the presently conventional electronic yarn cleaners possessing optical or capacitive measuring cell are manually adjusted to the yarn number which is to be processed, the amplification gain or factor at the yarn cleaner being adapted to the reference value.
  • Another, more specific object of the present invention relates to an apparatus of the mentioned type which avoids the drawbacks of the known techniques for adjusting the yarn cleaners.
  • Yet a further significant object of the present invention relates to an improved apparatus for the automatic adjustment or regulation of a yarn cleaner in a relatively quick, reliable and accurate manner.
  • the invention contemplates the provision of a signal feedback circuit which couples the output of the pulse shaper of the yarn cleaner with the input of a control device which by means of its output signal regulates the amplification gain at the amplifier.
  • the signal feedback circuit embodies a pulse evaluation circuit serving to generate an average value signal from a predetermined number of signals appearing at the output of the pulse shaper.
  • control signal is used to bring about the control device automatically accommodates the adjustment at the amplifier of the yarn cleaner to the changes in the operating conditions which are characterized or symbolized by the average value signal, these operating condition changes being such, as for instance, increasing contamination of an optical measuring cell. In this manner it is possible in every instance and under all possible working conditions to achieve a uniform yarn cleaning quality.
  • FIG. I is a schematic block diagram of a preferred embodiment of inventive apparatus
  • FIG. 2 is a detailed circuit diagram of the apparatus dcpicted in FIG. 1;
  • FIGS. 3 and 4! graphically illustrate the mode of operation of the apparatus depicted in FIG. 2;
  • FIG. 5 is a graphic representation of the mode of operation of a variant of inventive apparatus.
  • FIG. l the therein illustrated arrangement of a preferred embodiment of inventive yarn cleaner 1 will be seen to incorporate, in known manner, an optical or capacitive measuring cell 2, a controllable amplifier 3, a pulse shaper 4, a pulse evaluation circuit 5 and a yarn-cutting device 6.
  • a control device of mechanism 7 is electrically coupled with the amplifier 3. This control device 7 serves to bring about variation of the amplification gain or factor at the amplifier 3.
  • the input of this control device 7 is connected through the agency of a pulse evaluation circuit 8 with the output of the pulse shaper 4, thus rendering possible a signal feedback.
  • this signal is delivered to the evaluation circuit 5 which is in the form of a threshold switching mechanism possessing an adjustable response threshold as a function of a percentage of the amplitude of the arriving signal and from such location is delivered to the yarn separating or cutting mechanism 6 and, on the other hand, the aforementioned signal at the output side of the pulse shaper 4 is also delivered to the pulse evaluation circuit 8.
  • the pulse evaluation circuit 8 embodies an integrator and prestorage device 10, a counter 11 and a main storage device 12.
  • the signals delivered from the pulse shaper 4 and which are determined in number by the counter mechanism 11 are integrated and stored in the integrator and prestorage device 10, in order to thereby form an average value from the number of pulses which have been predetermined by the counter mechanism 11.
  • This average value signal then is fed to the main storage device 12 where it stands in readiness as a base value and can be extinguished by a signal from the counter II and replaced by a new average value signal, as such will be described in greater detail hereinafter.
  • the average value signals arrive from the output of the main storage device 12 at the control device 7 which, because of voltage differences between successive average value signals, adjust the amplification gain at the amplifier 3 in such a manner that the relationship between the average base amplification and the fixedly adjusted threshold value at the threshold value circuit 5 and therefore the sensitivity of the yarn cleaner 1 remains constant.
  • the pulse shaper 4 provided for this purpose embodies a switch at which can be actuated by the aforementioned control means of the winding machine, and which switch is opened for a predetermined time according to the amplitude of the curve 13 in FIG. 3.
  • the voltage U can charge a switch e in the aforedescribed manner at the threshold evalua tion circuit 5 and the pulse evaluation circuit 8 (FIG. 1).
  • the closing time of the timing switch e which is likewise controlled by the automatic control mechanism of the winding machine is represented by curve 17 in FIG. 3. Consequently, at the input of the pulse evaluation circuit 8 there appears the pulse represented by curve 18 in FIG. 3 and having the voltage U
  • the switch d closes according to the curve 13 of FIG. 3, whereupon the capacitor 14 of the pulse shaper 4 is discharged.
  • the pulse which has been generated in.the aforedescribed manner and delivered to the pulse evaluation circuit 8, which pulse is represented by curve 18 in FIG. 3, is proportional to the cross section of the yarn F inserted into the measuring cell 2.
  • the pulse evaluation circuit 8 cmbraces a counter mechanism 11 (FIG. 1) which counts a predetermined number of incoming pulses.
  • this counter mechanism or counter 11 is formed from a number of binary units 19 which provide a so-called frequency divider. After the pulse has passed through the last binary unit 19 the pulse can be amplified in a suitable amplification device 20 in order to then arrive at a timing element 21.
  • the last-mentioned timing element 21 is capable of delivering, in accordance with a predetermined program, three signals via the outputs 22, 23 and 24, as such will be described in greater detail hereinafter.
  • the input signal U arrives parallel to the counter mechanism 11 at the prestorage device 10, which according to this figure, possesses a suitable transducer 25 which converts the input voltage U into a proportional current and delivers such in the form of a pulse.
  • the pulses which follow one another then charge a subsequently arranged capacitor 26 which serves as the prestorage device.
  • the signal U.. which has been amplified by the impedance matching device 27, as such has been graphically represented by the curve 38 in FIG. 4.
  • curve 38 represents the number of added pulses U; of the curve 29 shown in FIG. 4.
  • control device 7 When changing the yarn quality which is to be processed or, for instance, the yarn number, and to prevent too large a loss in time due to the self-regulating efi'ect of the apparatus by virtue of forming a multiplicity of average values and therefore to prevent the removal of a corresponding large number of yarn ruptures, the control device 7 is advantageously equipped with a parallelly connected manually operated precontrol device 34 which initially enables carrying out a coarse adjustment of the amplification gain at the amplifier 3 corresponding to the yarn quality or yarn number, respectively.
  • an apparatus for the automatic adjustment of such yarn cleaner which comprises a control device electrically coupled with said amplifier, a signal feedback circuit electrically coupling the output of said pulse shaper with the input of said control device, the output of said control device being used for adjusting the amplification gain of said amplifier, said signal feedback circuit comprising a pulse evaluation circuit for generating an average value signal from a predetermined number of signals appearing at said output of said pulse shaper.
  • said pulse evaluation circuit embodies a pulse counter mechanism, an integrator and prestorage circuit means and a main storage circuit means.
  • said prestorage circuit means includes a capacitor connected in parallel with a switch means thereof, and wherein said main storage circuit means includes a capacitor connected in parallel with a switch means thereof.
  • pulse counter mechanism includes an output side formed by a timing element for the programmed control of the output signals thereof via said control conductor means.
  • control device comprises a bridge arrangement.
  • control device comprises a thermistor.
  • pulse counter mechanism comprises frequency divider means formed by a number of bistable units.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Looms (AREA)
US11461A 1969-03-05 1970-02-16 Apparatus for the automatic adjustment of a yarn cleaner Expired - Lifetime US3631354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH335469A CH490259A (de) 1969-03-05 1969-03-05 Einrichtung zum automatischen Einstellen eines Garnreinigers

Publications (1)

Publication Number Publication Date
US3631354A true US3631354A (en) 1971-12-28

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ID=4254162

Family Applications (1)

Application Number Title Priority Date Filing Date
US11461A Expired - Lifetime US3631354A (en) 1969-03-05 1970-02-16 Apparatus for the automatic adjustment of a yarn cleaner

Country Status (7)

Country Link
US (1) US3631354A (de)
JP (1) JPS543986B1 (de)
AT (1) AT307933B (de)
CH (1) CH490259A (de)
DE (1) DE2005840A1 (de)
FR (1) FR2034671A1 (de)
GB (1) GB1270885A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748707A (en) * 1970-10-20 1973-07-31 Shimadzu Corp Electronic yarn cleaner
US3758216A (en) * 1971-05-27 1973-09-11 Loepfe Ag Geb Electronic appliance for setting and checking electronic yarn clearers
US3892951A (en) * 1973-02-05 1975-07-01 Loepfe Ag Geb Method and apparatus for adjusting an electronic yarn cleaner
US4169399A (en) * 1977-06-17 1979-10-02 Gebruder Loepfe Ag Electronic device for controlling the function of an electronic yarn clearer
EP2075209A1 (de) * 2007-12-28 2009-07-01 L.G.L. Electronics S.p.A. Vorrichtung zum Messen der Fadenspannung

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568405A5 (de) 1974-02-08 1975-10-31 Zellweger Uster Ag
JPS56131451U (de) * 1980-03-10 1981-10-06
CH655571B (de) * 1981-09-30 1986-04-30
JPS5862261U (ja) * 1981-10-21 1983-04-26 日本電子機器株式会社 酸素濃度センサ−
DE3632672A1 (de) * 1986-09-26 1988-04-07 Borg Instr Gmbh Anordnung zur bestimmung eines durchschnittswertes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132407A (en) * 1961-09-22 1964-05-12 Philips Corp Cutting mechanism for use in an electronic yarn cleaner
US3476329A (en) * 1965-07-06 1969-11-04 Zellweger Uster Ag Apparatus and method for avoiding unnecessary cuts by electronic yarn cleaners
US3488604A (en) * 1967-09-01 1970-01-06 Sperry Rand Corp Automatic pulsed-signal amplitude normalizer
US3525942A (en) * 1968-02-19 1970-08-25 Beckman Instruments Inc Calibration circuit for photometric analyzers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3132407A (en) * 1961-09-22 1964-05-12 Philips Corp Cutting mechanism for use in an electronic yarn cleaner
US3476329A (en) * 1965-07-06 1969-11-04 Zellweger Uster Ag Apparatus and method for avoiding unnecessary cuts by electronic yarn cleaners
US3488604A (en) * 1967-09-01 1970-01-06 Sperry Rand Corp Automatic pulsed-signal amplitude normalizer
US3525942A (en) * 1968-02-19 1970-08-25 Beckman Instruments Inc Calibration circuit for photometric analyzers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3748707A (en) * 1970-10-20 1973-07-31 Shimadzu Corp Electronic yarn cleaner
US3758216A (en) * 1971-05-27 1973-09-11 Loepfe Ag Geb Electronic appliance for setting and checking electronic yarn clearers
US3892951A (en) * 1973-02-05 1975-07-01 Loepfe Ag Geb Method and apparatus for adjusting an electronic yarn cleaner
US4169399A (en) * 1977-06-17 1979-10-02 Gebruder Loepfe Ag Electronic device for controlling the function of an electronic yarn clearer
EP2075209A1 (de) * 2007-12-28 2009-07-01 L.G.L. Electronics S.p.A. Vorrichtung zum Messen der Fadenspannung

Also Published As

Publication number Publication date
FR2034671A1 (de) 1970-12-11
CH490259A (de) 1970-05-15
AT307933B (de) 1973-06-12
JPS543986B1 (de) 1979-02-28
GB1270885A (en) 1972-04-19
DE2005840A1 (de) 1970-09-10

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