US3594558A - Process and apparatus for determining the action of an electronic thread cleaner - Google Patents

Process and apparatus for determining the action of an electronic thread cleaner Download PDF

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Publication number
US3594558A
US3594558A US792332*A US3594558DA US3594558A US 3594558 A US3594558 A US 3594558A US 3594558D A US3594558D A US 3594558DA US 3594558 A US3594558 A US 3594558A
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Prior art keywords
thickness
thread
auxiliary quantity
length
variations
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Expired - Lifetime
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US792332*A
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English (en)
Inventor
Erich Loepfe
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Loepfe AG Gebrueder
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Loepfe AG Gebrueder
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/36—Textiles
    • G01N33/365—Filiform textiles, e.g. yarns
    • 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

  • the cleaning action of an electronic thread cleaner is determined by calculating from variations in time of the thickness of a thread at least one value determined by the appearance of frequent variations in thickness, the value being that of a suitably selected auxiliary quantity which can be determined in the range of frequent thickness variations as well as the range of rare thickness variations. Then the cleaning action can be determined on the basis of this value or values by extrapolation of the course of this auxiliary quantity depending upon the set parameters of the thread cleaner within the range of the rare deviations in thickness.
  • This invention relates to a process and an apparatus for determining the action of an electronic thread cleaner.
  • Electronic thread cleaners are used in textile thread winding machines for the supervision of the thickness of the moving thread.
  • this thickened section is determined by the thread cleaner and is removed from the'thread. In the course of this cleaning operation" the disturbing errors in the thread are replaced by less disturbing thread knots.
  • the extent of the activating thread error is fixed by a setting of the thread cleaner. It depends in individual cases upon the type of the thread being used, its further treatment, its intended use, special requirements for the quality of the final product, etc.
  • Errors in thread which must be corrected occur comparatively rarely, for example, in one spool location there may be on the average I to 2 errors for every 5 minutes or for a yarn length of 4,000 meters.
  • the setting of a thread cleaner on the basis of spool tryouts consumes a very large amount of time and is expensive. Therefore, the tendency is to predict information about settings which is not sufficiently statistically justified, with the danger that improper settings will be used producing economic and qualitative damages.
  • An object of the present invention is to eliminate these drawbacks by determining the cleaning effect corresponding to the specific setting of the thread cleaner in the simplest possible manner and within a short time.
  • an end value is selected for this auxiliary quantity which results from observing a very long length of thread, the end value being that of the sums of values of a functional development investigated in a thread cleaner during the appearance of a thickening and related to the examined length of thread.
  • FIG. I is a diagram illustrating the signals appearing in a I thread cleaner as a function of time.
  • a signal is produced in the testing device of an electronic thread cleaner, the course in time of which corresponds to the course of the thread thickness along the thread.
  • This signal f(r) is illustrated in FIG. I. It contains the entire concerning the occurrences to be observed, namely, the thickened portions of the thread which, by way of example, are greater than a certain predetermined reference value p.
  • a single event can be represented in different ways with the help of the function f(t). For that purpose a so-called event-function is derived generally from f(t).
  • the maximal thickness deviations 11, the thread lengths l during which f(r) is greater than the reference value p,'distances a between two length sections which follow each other, or a function of such values can be all evaluated in the thread cleaner.
  • Another possibility consists in changing initially the function f(t) itself, for example, and to evaluate the function thus produced in the manner described for f(t).
  • FIG. 2 illustrates diagrammatically a device of the present invention for evaluating the information concerning the thicknesses of the thread F.
  • a sensing head TK which may be optical supplies this information in the form of the function f (r) containing the values which, as already stated, serve to evaluate an occurrence.
  • the sum of these occurrences constitutes an amount M.
  • the evaluating section EE which contains thickness discriminating (Schmitt trigger) and length measuring circuits a part m of this amount is selected, representing occurrences which satisfy specific criteria. These criteria are fixed by the structure of the evaluating circuit and by the values (P,,) of the set values of the thread cleaner.
  • the parameters p are determined in the threshold-setting circuit ZE 2 of the central actuating device ZE by the setting E and are transmitted to the evaluating circuit, for example, as electrical actuating voltages.
  • the evaluating circuit transmits information concerning the partial amount m to the integrating circuit (Miller integrator) ZE l of the actuating device 25 wherein the corresponding value of an auxiliary quantity W is derived therefrom.
  • the auxiliary quantity W is so selected that it is precisely defined for a specific occurrence value m. Since a specific partial value m of the total amount M is related to each parameter arrangement (p namely, to each group of parameters p,, p,,.... p representing a setting of the thread cleaner, the auxiliary quantity W is a specific function of the setting of the thread cleaner.
  • the setting of the thread cleaner is given by a single parameter p which, as shown in FIG. I, is represented as a step in the signal course f(t), or f(t).
  • the occurrence value m can be also described, for example, as a single quantity, which in this case represents the occurrence function, for example, as the length sections I,(p) corresponding to the step p.
  • auxiliary quantity W shall be considered as the end value of the sums of all 1, related to the observed length L, the end value resulting from a very long length L according to the formula: L
  • FIG. 3 shows the course of this quantity dependent upon the step p.
  • the observed function W should have the same general continuity for a group of yarns in the range (a, x This corresponds, for example, in this case to a function of the type exp(p"), namely, particularly to the course of frequency closeness of a Gauss normal distribution.
  • FIG. 4 illustrates diagrammatically an apparatus by means of which this can be attained.
  • TK indicates again the sensing head of the thread cleaner which produces the signal f(t).
  • This signal is amplified in an amplifier V and is filtered in a lowpass filter circuit T? which produces the signal functionfir).
  • thickness discriminating circuit S of the thread cleaner which contains a Schmitt-triggerju
  • S of the thread cleaner which contains a Schmitt-triggerju
  • a steering impulse for the yarn severing device TV is produced as soon as fit
  • Z To this apparatus which is known in prior art the present invention adds a device for determining the desired cleaning action.
  • the device of the present invention includes a second thickness discriminating circuit S which also receives the signalflt and which is connected on the other hand selectively with one of the contacts a or b of a voltage divider R R
  • the values of the auxiliary quantity W which are thus produced are determined in integrating circuit W which follows the device 8,, and are indicated in indicating device I.
  • a predetermined value A is set in the indicating device I by means of the setting device 5,, the switch being in the position A. Thenit is switched over to the position B and the step b is determined by the setting device E.
  • the value B of the auxiliary quantity which is shown by the instrument, is thus a measure for the value x which corresponds to very long lengths of thread and thus to the cleaning action of the thread cleaner.
  • the integrating circuit W used for its detennination is preferably constructed as a Miller integrator.
  • the discriminator step S consists then, for example, of a Schmitt-trigger which supplies a series of impulses of a given size and having a duration corresponding to the length sections 1,. These impulses charge in the Miller integrator a integrator a charging condenser with constant current during the stretch 1,.
  • the leak current discharging the condenser has the effect that a stationary condition is produced in which the charge of the condenser constitutes a measure for the average number and the average size of the length sections I When the capacity is sufficiently large and the leak current is sufficiently small, the
  • occurrences considered during thread cleaning are described by more than one factor and supply several parameters for determining the setting of the cleaner.
  • the auxiliary quantity can be again obtained from the occurrence function, namely As established in practice, this produccs a function of the I I paratus.
  • the signal produced in the sensing head TX is supplied to two parallel channels L and D in which the values l,-/p and d lp are formed. Threshold-setting circuits p, and p, are used to determine the setting parameters.
  • the outlets of the channels L, D are added in the addition circuit A and the occurrence function which is thus produced is transmitted in the switch position X,, X, to the discriminating circuit S which actuates the yam-severing device TV.
  • a suitable integrating circuit W which, for example, can again contain a Miller integrator, to produce the auxiliary quantity which is indicated in the indicating device I.
  • a separate device L, D, A can be provided for operating the integrating circuit W. This makes possible simultaneous cleaning and indication.
  • the various circuits and devices disclosed herein, excepting the two channels L and D of FIG. 5, are fully described and explained in both structure and operation in US. Pat. No. 3,303,698, to Erich Loepfe, granted Feb. 14, 1967.
  • one, two or more set points are necessary for extrapolation in each parameter depending upon the extent of the application, the required precision and the selection of the auxiliary quantity.
  • a process of detennining the cleaning action of an electronic thread cleaner which comprises producing at least one value of an auxiliary quantity from variations in thread thickness, said value being determined by the appearance of frequent thickness variations, whereby said auxiliary quantity is fixable in the range of frequent thickness variations as well as in the range of rare thickness variations, and extrapolating the course of said auxiliary quantity depending upon set parameters of the thread cleaner in the range of rare thickness deviations.
  • a process in accordance with claim 3, comprising producing said signal by filtering during the course of thickness variations and using said signal for determining the length sections.
  • An apparatus for determining the cleaning action of an electronic thread cleaner which comprises, a device for producing an auxiliary quantity, the value of said auxiliary quantity being determined by the appearance of frequent thickness variations, whereby said auxiliary quantity is fixable in the range'of frequent thickness variations as well as in the range of rare thickness variations, an evaluating circuit of the thread cleaner, a device for producing actuating voltages for said evaluating circuit and maintaining the actuating voltages corresponding to a set value in a predetermined relationship, and means interconnecting said two devices.
  • said device for producing said auxiliary quantity comprises an integrator and an accumulating condenser.
  • the apparatus for determining the cleaning action of an electronic thread cleaner said electronic thread cleaner comprising means for sensing a running thread and producing an electrical output signal indicating the thickness of the thread, and severing means operatively connected in series with the output of said sensing means, said apparatus comprising:
  • thickness-discriminating means the input of said thicknessdiscriminating means being operatively connected in series with the output of said sensing means;
  • threshold-setting means for setting the response threshold of said thickness-discriminatin means. 1 l.
  • the apparatus as defined in c aim 10 which further comprises:

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Food Science & Technology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
US792332*A 1968-01-31 1969-01-21 Process and apparatus for determining the action of an electronic thread cleaner Expired - Lifetime US3594558A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH151768A CH466108A (de) 1968-01-31 1968-01-31 Verfahren und Vorrichtung zur Bestimmung der Reinigungswirkung eines elektronischen Fadenreinigers an Textilfaden-Spulmaschinen

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US3594558A true US3594558A (en) 1971-07-20

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US792332*A Expired - Lifetime US3594558A (en) 1968-01-31 1969-01-21 Process and apparatus for determining the action of an electronic thread cleaner

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US (1) US3594558A (de)
JP (1) JPS4819898B1 (de)
CH (1) CH466108A (de)
DE (1) DE1900312C3 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697732A (en) * 1970-01-14 1972-10-10 Peyer Siegfried Multiple operating head machines, particularly multiple spindle textile spooling machines with supervisory operating time indicator
US3887814A (en) * 1973-11-01 1975-06-03 Du Pont Yarn slub analyzer
US3892951A (en) * 1973-02-05 1975-07-01 Loepfe Ag Geb Method and apparatus for adjusting an electronic yarn cleaner
US4045659A (en) * 1975-04-07 1977-08-30 Asahi Kasei Kogyo Kabushiki Kaisha Apparatus for the evaluation of yarn qualities
US4430720A (en) 1979-03-16 1984-02-07 Zellweger Uster Ag Cleaning yarns and assessing yarn defects
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
US5197012A (en) * 1988-11-21 1993-03-23 Datatronic, Centre D'etude Et De Developpement Electronique Et Informatique Sarl Method and apparatus for detecting and for counting any instantaneous variations in a profile, and applications thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH683350A5 (de) * 1991-09-11 1994-02-28 Peyer Ag Siegfried Verfahren und Vorrichtung zum Klassifizieren und Reinigen von Garnen.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714328A (en) * 1951-07-28 1955-08-02 Fabric Res Lab Inc Apparatus and method for testing drape of a fabric

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2714328A (en) * 1951-07-28 1955-08-02 Fabric Res Lab Inc Apparatus and method for testing drape of a fabric

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697732A (en) * 1970-01-14 1972-10-10 Peyer Siegfried Multiple operating head machines, particularly multiple spindle textile spooling machines with supervisory operating time indicator
US3892951A (en) * 1973-02-05 1975-07-01 Loepfe Ag Geb Method and apparatus for adjusting an electronic yarn cleaner
US3887814A (en) * 1973-11-01 1975-06-03 Du Pont Yarn slub analyzer
US4045659A (en) * 1975-04-07 1977-08-30 Asahi Kasei Kogyo Kabushiki Kaisha Apparatus for the evaluation of yarn qualities
US4430720A (en) 1979-03-16 1984-02-07 Zellweger Uster Ag Cleaning yarns and assessing yarn defects
US5197012A (en) * 1988-11-21 1993-03-23 Datatronic, Centre D'etude Et De Developpement Electronique Et Informatique Sarl Method and apparatus for detecting and for counting any instantaneous variations in a profile, and applications thereof
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
DE1900312B2 (de) 1973-04-19
DE1900312A1 (de) 1969-08-14
JPS4819898B1 (de) 1973-06-16
CH466108A (de) 1968-11-30
DE1900312C3 (de) 1973-11-08

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