US3371568A - Method and apparatus for checking knots - Google Patents

Method and apparatus for checking knots Download PDF

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Publication number
US3371568A
US3371568A US537884A US53788466A US3371568A US 3371568 A US3371568 A US 3371568A US 537884 A US537884 A US 537884A US 53788466 A US53788466 A US 53788466A US 3371568 A US3371568 A US 3371568A
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US
United States
Prior art keywords
thread
knot
measuring device
signal
measuring
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Expired - Lifetime
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US537884A
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English (en)
Inventor
Felix Ernst
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/04—Processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/525—Operation controlled by detector means responsive to work
    • Y10T83/531—With plural work-sensing means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/525—Operation controlled by detector means responsive to work
    • Y10T83/541—Actuation of tool controlled in response to work-sensing means
    • Y10T83/543—Sensing means responsive to work indicium or irregularity

Definitions

  • the present invention avoids these drawbacks by providing a method for checking knots in a traveling thread which comprises the steps of producing a first signal corresponding to a knot on a traveling thread, detecting the cross section of the traveling thread in the vicinity of the knot, producing a second signal in response to the detection of a thread cross section in excess of a predetermined measured size, detecting the simultaneous presence of the first and second signals and severing the traveling thread in the vicinity of the knot upon detection of the simultaneous presence of the first and second signals.
  • the present invention provides an apparatus for checking knots in a traveling thread which comprises a first measuring device for producing a first signal corresponding to a knot passing therethrough, a second measuring device for detecting the cross section of the thread in the vicinity of the knot and for producing a second signal in response to the detection of a thread cross section in excess of a predetermined measured size, means responsive to the simultaneous presence of the first and second signals for delivering a third signal and means responsive to the third signal for actuating a cutting device to sever the traveling thread in the vicinity of the knot.
  • first measuring device for example, of the electrically capacitively operating type through which a thread is passed and which produces a signal whenever a knot passes through the device
  • second measuring device for example, also of the electrically capacitively operating type through which the thread is passed
  • FIG. 1 is a diagrammatic illustration of a measuring zone arrangement, with a thread running through;
  • FIG. 2 is a diagrammatic illustration of a measuring zone arrangement, with .a knot running through;
  • FIG. 3 is a block diagram of an apparatus for the evaluation of the signals produced in the measuring zone arrangement shown in FIGS. 1 and 2;
  • FIG. 4 shows schematically a variant of the measurement zone arrangement
  • FIG. 5 shows schematically another variant of the measuring zone arrangement
  • FIG. 6 shows a modification of the apparatus illustrated in FIG. 3.
  • a first measuring zone which may, for example, be formed by the electrodes of a capacitively operating measuring device 1, as generally shown in US. Letters Patent Nos. 3,009,101 and 3,039,051, is spaced a short distance behind a second measuring zone formed by a second measuring device 2 with respect to the direction of travel of thread 4 therethrough.
  • the thread 4 runs from left to right, in the direction indicated by the arrow, in passing through these measuring zones.
  • the thread shown includes a knot 41 which has a remnant thread 42 trailing behind it such as that which occurs when the knotting apparatus either does not cut completely through the thread ends, or when a third thread is carried along in the knotting apparatus without being embodied, so that it does not become cut off with the other thread ends.
  • FIG. 2 the knot 41 is shown advanced into the region of the measuring zone 1, while the remnant threads 42 is still in the effective measuring zone 2.
  • a signal When a normal knot enters the measuring device 2 a signal is triggered. However, when the normal knot subsequently enters the measuring device 1 a signal is produced only by the measuring device 1, a single thread being situated in the device 2. However, if the knot drags along a remnant thread 42, then measuring device 1 as well as the device 2 will emit signals simultaneously to indicate the presence of a defective knot, because the device 2 is set to be actuated by two threads 4 and 42 when the knot 41 enters measuring device 1.
  • This simultaneous emission of two signals may be used, for example, for initiating the cutting of the thread in the vicinity of the defective knot.
  • the first measuring zone may be duplicated on the other side of the second measuring Zone, such .an arrangement being shown by FIG. 4.
  • a defective knot is then indicated by a simultaneous signal produced by the measuring device 2 and by at least one of the measuring devices 1' and 1".
  • FIG. 5 Another way of making the apparatus independent of the direction in which the thread runs, is shown in FIG. 5.
  • the second measuring zone is duplicated.
  • a defective knot produces a signal either at measuring device 2 or at measuring device 2", and also at measuring device 1.
  • FIG. 3 shows a block diagram of one example of carrying out the invention.
  • the two measuring devices 1, 2 form capacitive measuring systems. They may, however, sense the thread thickness by optical, magnetic, radiationabsorbing or other means, and produce corresponding signals.
  • High-frequency power for operating the measuring devices 1 and 2 is supplied by conventional high-frequency generators 5 and 6, respectively. It is also possible to use a single high-frequency generator in common for both measuring devices. Depending on the capacity present in the measuring devices 1, 2 (i.e., volume of the yarn portion in the measuring zone), more or less high-frequency energy is supplied to working resistances 7, 8. The voltages at these resistances are rectified in diodes Q, 10, respectively.
  • a direct current voltage is first formed at condensers 11 and 12, through rectification of the highfrequency voltage originating from the zero capacity of the respective measuring device, i.e., the capacity of the measuring device when no thread is present therein; thereafter, upon introduction of a thread in the measuring device an additional capacity is formed, and thus an increased high-frequency voltage at the working resistances 7, 8; and finally, an additional voltage originator at the condensers 11, 12 which voltage is proportional to the quantity of thread in the respective measuring device.
  • the DC voltage is separated through condensers 13, 14.
  • the static zero potential reaches past resistances 15 and 16 to the input of the amplifiers 21, 22 in the conventional manner.
  • the resistances 15 and 16 are provided with switches 23, 24 which will be explained later.
  • the output voltages of the amplifiers 21 and 22 arrive at conventional Schmitt triggers 25 and 26, respectively.
  • the Schmitt trigger 25 is set so that it tilts when a knot enters a measuring device 1.
  • the Schmitt trigger 26 on the other hand is adjusted in such a way that it tilts when two threads are present in a measuring device 2.
  • the outputs from these Schmitt triggers are conducted to the input of a conventional AND gate 30.
  • the output of the AND gate 30 is connected to the input of an end stage 31, which, for example, actuates a thread cutting device.
  • an apparatus according to the present invention operates after the knotting operation.
  • Many of the automatic spooling machines referred to at the outset have only one knotting mechanism for a number of spooling locations.
  • checking of the knots is assured if the apparatus cooperates with the knotting mechanism in such a way that the thread is guided so that at least the knot runs through the knot-checking apparatus.
  • the knotting and checking operation is, for example, effected as follows: seizing the two thread ends to be tied and directing the thread ends to the knotter; knotting; starting the cross spool; and passing the knot through the knot-checking apparatus.
  • the condensers 13 and 14 serve to separate out the DC voltage originating from the zero capacity of the measuring devices.
  • the time constant of the condenser 13 and of resistance 15, and of condenser 14 and of resistance 16 must on the one hand be relatively small, one second, for example, in order to permit guide stabilization, for example, when the apparatus is started; on the other hand, this time constant should be great so that the voltage at the condensers 13 and 14 does not lag unallowably from the instant of the entry of the single thread into the checking apparatus until completion of the checking operation.
  • an apparatus as described below may be connected.
  • An additional Schmitt trigger 27 whose tilting limit is adjusted to a fairly small response range, for example 10% of the mean value of the cross section of the thread passing through the measuring zones, is connected in parallel with the Schmitt trigger 26 to tilt upon entry of a thread into the apparatus. If desired, it can be connected in parallel with the Schmitt trigger 25.
  • the Schmitt trigger 27 energizes a relay 28 which includes two normally closed contacts 2'3 and 24. When the Schmitt trigger 27 tilts, the relay 28 is deenergized and the two contacts 23 and 24 are opened.
  • time constant changer can be connected ahead of or after the amplifier, or ahead of and after the amplifier, in order to separate the DC voltage originating from the zero capacity at the input to the amplifier, and in order to eliminate instabilities in the amplifier itself.
  • the apparatus according to the present invention can be adapted, with relatively small expenditure, to solve additional problems.
  • the size of the knot can be checked by connecting an additional Schmitt. trigger 32 (FIG. 6) in parallel to the Schmitt trigger 25 whereby the tilting limit of the trigger' 32 is adjusted to correspond to the permissible, size of the knot and the output of the trigger 32 is connected directly to the final stage 31 for rendering the stage ineffective upon passage of a knot of permissible size.
  • a method of checking knots in a traveling thread comprising the steps of producing a first signal corresponding to a knot in the traveling thread
  • a method as set forth in claim 1 which further comprises the steps of detecting the size of said knot and producing a third signal in response to the detection of a knot size different from a predetermined measured size whereby the traveling thread is severed in the vicinity of said knot upon production of said third signal and one of said first and second signals.
  • An apparatus for checking knots in a traveling thread comprising a first measuring device for producing a first signal corresponding to a knot in the traveling thread passing therethrough,
  • a second measuring device upstream of said first measuring device for detecting the cross section of the traveling thread in the vicinity of said knot and for producing a second signal in response to the detection of a thread cross section in excess of a predetermined measured size
  • said means responsive to the simultaneous presence of said first and second signals comprises an AND gate, said AND gate being opened on the simultaneous presence of said first and second signals whereby the output thereof is delivered as said third signal.
  • An apparatus as set forth in claim 3 which further comprises a third measuring device upstream of said second measuring device for producing a fourth signal corresponding to a knot in the traveling thread passing therethrough whereby the traveling thread is severed upon simultaneous presence of said second signal and at least one of said first and fourth signals.
  • An apparatus as set forth in claim 3 which further comprises a third measuring device downstream of said first measuring device for detecting the cross section of the traveling thread in the vicinity of said knot and for producing a fourth signal in response to the detection of a thread cross section in excess of a predetermined measured size whereby the traveling thread is severed upon simultaneous presence of said first signal and at least one of said second and fourth signals.
  • An apparatus as set forth in claim 3 which further comprises a means for detecting the size of said knot and for producing a fourth signal in response to the detection of a knot size difierent from a predetermined measured size whereby the traveling thread is severed upon simultaneous presence of said fourth signal and one of said first and second signals.
  • said first means and said second means each comprises a resistance-condenser element, and a time constant varying means connected to said resistance-condenser elements, said time constant varying means being capable of reducing the time constant of said resistance-condenser elements when thread passage is initiated and of substantially increasing the time constant of said resistance-condenser elements when a signal is produced -by one of said first and second means.
  • said first and second measuring devices include a condenser in the path of each of said first and second signals, -a relay having a pair of contacts, each of said contacts being disposed in a respective path of said first and second signals downstream of a respective condenser, a pair of resistances, each of said resistances being connected to -a respective one of said contacts for operative connection into said respective paths of said signals, and means for triggering said relay upon entry of the traveling thread into said second measuring device whereby the time constant of said condenser and resistance are changed upon passage of a thread through said first measuring device.
US537884A 1965-03-31 1966-03-28 Method and apparatus for checking knots Expired - Lifetime US3371568A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH446865A CH419660A (de) 1965-03-31 1965-03-31 Verfahren und Vorrichtung zur Kontrolle von Knoten

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US (1) US3371568A (de)
AT (1) AT260739B (de)
BE (1) BE675191A (de)
CH (1) CH419660A (de)
DE (1) DE1560639A1 (de)
ES (1) ES322049A1 (de)
GB (1) GB1134523A (de)
NL (1) NL6517001A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795906A (en) * 1972-05-19 1974-03-05 Leesona Corp Electronic system distinguishing between good knots and defects in a moving strand
US3809869A (en) * 1969-06-27 1974-05-07 Schlafhorst & Co W Method and device for monitoring the production process of automatic yarn winding machines
US3845377A (en) * 1972-04-20 1974-10-29 Nihon Regulator Kk Rotational angle transducer
US3864626A (en) * 1973-01-26 1975-02-04 Celanese Corp Method and apparatus for evaluating properties of materials
US3922601A (en) * 1974-03-01 1975-11-25 Du Pont Spiral plate yarn measuring capacitance cell
US3971272A (en) * 1963-10-01 1976-07-27 Zellweger, Ltd. Regulation of electronically operated quality control equipment
US3979666A (en) * 1973-01-26 1976-09-07 Celanese Corporation Method and apparatus for evaluating properties of carbon fibers using capacitance sensing
US4016790A (en) * 1963-10-01 1977-04-12 Zellweger, Ltd. Regulation of electronically operated quality control equipment
US4021733A (en) * 1975-09-29 1977-05-03 Probe Engineering Company Limited Moisture meters
US5244162A (en) * 1992-02-20 1993-09-14 Automated Gasket Corp. Method and apparatus for providing uniform thickness rolls of gasket material
EP3779351A3 (de) * 2019-07-25 2021-05-19 VÚTS, a.s. Kapazitiver sensor zur messung transversaler geometrischer parameter von flachen bandförmigen textilen faserstrukturen und entsprechendes verfahren

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3039051A (en) * 1959-08-12 1962-06-12 Zellweger Uster Ag Apparatus for gaging textile materials
US3185924A (en) * 1959-07-14 1965-05-25 Zellweger Uster Ag Apparatus utilizing capacitance measuring means for the continuous monitoring of elongate materials during production to permit determination of the devlation of the denier from a desired value
US3303698A (en) * 1962-12-22 1967-02-14 Loepfe Ag Geb Apparatus for sensing yarn irregularities and producing a control signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185924A (en) * 1959-07-14 1965-05-25 Zellweger Uster Ag Apparatus utilizing capacitance measuring means for the continuous monitoring of elongate materials during production to permit determination of the devlation of the denier from a desired value
US3039051A (en) * 1959-08-12 1962-06-12 Zellweger Uster Ag Apparatus for gaging textile materials
US3303698A (en) * 1962-12-22 1967-02-14 Loepfe Ag Geb Apparatus for sensing yarn irregularities and producing a control signal

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3971272A (en) * 1963-10-01 1976-07-27 Zellweger, Ltd. Regulation of electronically operated quality control equipment
US4016790A (en) * 1963-10-01 1977-04-12 Zellweger, Ltd. Regulation of electronically operated quality control equipment
US3809869A (en) * 1969-06-27 1974-05-07 Schlafhorst & Co W Method and device for monitoring the production process of automatic yarn winding machines
US3845377A (en) * 1972-04-20 1974-10-29 Nihon Regulator Kk Rotational angle transducer
US3795906A (en) * 1972-05-19 1974-03-05 Leesona Corp Electronic system distinguishing between good knots and defects in a moving strand
US3864626A (en) * 1973-01-26 1975-02-04 Celanese Corp Method and apparatus for evaluating properties of materials
US3979666A (en) * 1973-01-26 1976-09-07 Celanese Corporation Method and apparatus for evaluating properties of carbon fibers using capacitance sensing
US3922601A (en) * 1974-03-01 1975-11-25 Du Pont Spiral plate yarn measuring capacitance cell
US4021733A (en) * 1975-09-29 1977-05-03 Probe Engineering Company Limited Moisture meters
US5244162A (en) * 1992-02-20 1993-09-14 Automated Gasket Corp. Method and apparatus for providing uniform thickness rolls of gasket material
EP3779351A3 (de) * 2019-07-25 2021-05-19 VÚTS, a.s. Kapazitiver sensor zur messung transversaler geometrischer parameter von flachen bandförmigen textilen faserstrukturen und entsprechendes verfahren

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Publication number Publication date
DE1560639A1 (de) 1970-10-01
CH419660A (de) 1966-08-31
GB1134523A (en) 1968-11-27
NL6517001A (de) 1966-10-03
BE675191A (de) 1966-06-16
ES322049A1 (es) 1966-11-01
AT260739B (de) 1968-03-25

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