US3844101A - Thread monitor device for textile machinery - Google Patents

Thread monitor device for textile machinery Download PDF

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Publication number
US3844101A
US3844101A US00394936A US39493673A US3844101A US 3844101 A US3844101 A US 3844101A US 00394936 A US00394936 A US 00394936A US 39493673 A US39493673 A US 39493673A US 3844101 A US3844101 A US 3844101A
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United States
Prior art keywords
thread
electrodes
differential amplifier
guides
guide
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Expired - Lifetime
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US00394936A
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English (en)
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H Schwartz
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Individual
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Individual
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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
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
    • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B65H2513/11—Speed angular
    • 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 guides act, electrically, as separate electrodes and mechanically to, conjointly, form the guiding eye.
  • the guide-electrodes are connected over high impedance input to a differential amplifier which responds to presence of or absence of the thread which, due to the ballooning tendency, alternately contacts the one and the other of the hook-shaped guide-electrodes, to transmit pulses due to electrostatic charge on the thread to the differential amplifier or, if the thread is conductive due to moisture and low resistance material, or the presence of metallic threads, connects, alternately, a source of potential to the differential amplifier. Absence of pulses is an indication of thread breakage. An integrator delays initial sensing to permit start-up.
  • the present invention relates to a thread monitoring and detection device, and particularly such a device which is adapted to cooperate with thread handling apparatus in which the thread balloons outwardly, when the device is in operation.
  • thread monitor devices utilize various mechanical, electrical, and electronic and systems. Some electronic systems check axial, or radial movement of the thread and obtain a signal for the presence, or absence of the thread.
  • the thread sensing device in many instances it is possible to locate the thread sensing device in a region where the thread is longitudinally guided, that is, where it has relatively small radial movement.
  • reliable thread sensing is only obtained if the thread is sensed after all machine elements have been passed thereby, that is, if the presence or absence of thread is sensed preferably immediately in advance of it being wound on the spool.
  • the sensing element must then be located in the free space between the operating elements of the machine and the subsequent winding device. In this region, however, the
  • Textile threads of natural fibers require, however, a relatively high degree of moisture for machine handling; synthetic threads frequently are treated with chemicals which prevent acceptance of static charges during production of the thread. Electrical resistance of the thread is substantially reduced in these systems, so that electrostatic charge cannot be ensured. Textile threads which are mixed with metallic fibers cannot be used as charge carriers for static charges at all. Thus, known thread sensing or monitoring devices can be used only selectively.
  • two hook-shaped thread guides are located, spaced from each other, in the thread running direction, such that, together, in projection they form a thread eye with their free ends.
  • the hook-shaped guide elements are metallic, and are connected over resistors with a source of direct current in order to provide a voltage drop between the two elements, if connected by a metallic thread; they are coupled over capacitors with an input, each, of a differential amplifier in order to provide an output signal depending on the presence of thread and motion of the thread within the eye formed by the two guides.
  • the guides thus act, to define the thread eye and electrically as separate electrodes, and may be termed guide-electrodes.
  • FIG. 1 is a top view of the thread guiding eye formed by the two elements
  • FIG. 2 is a front view of the elements, highly schematic, and illustrating the position of a thread applied to a spooling device
  • FIG. 3 is a circuit diagram of the arrangement in accordance with the present invention.
  • the thread sensing device includes two similar hook-shaped metal elements 1' and 1". They are made, preferably, of steel wire about 3 to 4 mm diameter, and coated with a hard chrome finish. Each end of the thread guide is bent over hook-shaped, and the two hook-shaped guide elements are located to be offset with respect to each other by so that they, together, form, in projection, a thread guiding eye 2.
  • the hook-shaped elements are spaced from each other by about 2 3 mm, in the direction of thread movement. This permits easy threading of a thread F (FIG. 2) and further separates the hook-shaped elements electrically from each other.
  • the thread guide eye that is, the two elements, are located so that they are placed in the balloon formed by the thread when it is wound on a spool 8 (see FIG. 2), in such a manner that, as the thread forms its circular rotation, it is constantly in contact with the limiting surfaces defining the eye 2.
  • the thread alternately contacts the one or the other element 1' or 1'', respectively; upon transition from one to the other, both elements may be contacted together.
  • FIG. 2 illustrates, in solid line, the thread when wound on the left side of the spool 8, at which point it contacts only thread guide element 1", and in chain dotted line the position of the thread when the spool has revolved 180, and the thread contacts the element 1'.
  • the thread guide element 1" is connected over a high resistance resistor R1 with the positive terminal of a voltage source (FIG. 3), for example +24V; the other element 1 is connected to the negative terminal of the source over a resistor R2. A voltage, therefore, of 24 volts is applied between the two elements 1', 1".
  • the two guide elements form electrodes, which are connected over coupling capacitors C1, C2 to two high resistance inputs of a differential amplifier 3.
  • the resistors R1, R2 must be high resistors, and resistances of about 10 megohms are suitable.
  • the output of the differential amplifier 3 is connected to an integrator 4 which, in turn, is connected to a trigger circuit 5, the output of which is connected to an alarm 6 and to a monostable multivibrator 7, to initiate further control functions.
  • the differential amplifier will accept surrounding noise voltages due to the high input impedance, which are applied by capacitative or inductive coupling to the elements 1', 1". These noise voltages are primarily at power supply frequency, and are derived from usual power supply cables, for drive motors, supplies for supervisory equipment and the like.
  • a differential amplifier having an input sensitivity of 50 millivolts would be rapidly blocked by'noise frequencies, particularly since the rotational frequency of thread balloons, from experience, falls in the region of 50 200 Hz, that is, within the range of power line frequencies and the third harmonic thereof. Thus, filters cannot be used.
  • both thread guides are exactly equal, and have the same input capacitance to the differential amplifier, then noise signals will be induced in both hook-shaped elements with equal amplitude and phase, which will be transmitted with equal amplitude and phase to the differential amplifier so that it willnot provide an output signal.
  • the thread is of high resistance, and thus capable of holding a static charge, at least for a short period of time. It is not necessary to provide a specific static charge to the.thread-,,or to utilize any auxiliary charging devices. If the thread has received any charge, for example due to friction with some element of machinery, then this static charge is alternately applied to the hook-shaped elements 1 and 1" respectively, and transmitted to the respective amplifier inputs in the form of pulses. If the thread has not received any charge as yet, then friction with the hook-shaped elements, which are, respectively, connected to positive and negative terminals of the supply, will apply an electrostatic charge thereto, which charge will be alternately exchanged between the guide elements 1', 1" thus likewise providing pulse type signals to the amplifier 3.
  • Thesystem utilizes a signal which is obtained by electrostatic charge on the thread, or by thread resistance, and it is independent of the material, or of its electrical characteristics.
  • the output signal from differential amplifier 3 is rectified in a rectifier (not shown) and applied to an integrator '4.
  • integrator 4 integrates for a short period of time, for example for about 2 seconds, if a signal is present. Then a pulse is applied to set the trigger circuit 5, which may be an ordinary flip-flop. The delay prevents generation of a control signal upon threading of the thread or due to momentary manual contact with the thread guides. lf a thread signal is present for two seconds, then the circuit 5 changes state, and the system is in monitor or thread sensing condition.
  • the flip-flop 5 automatically switches back, immediately, which provides an alarm on a lamp 6, for example, and additionally a trigger pulse to a monostable multivibrator 7, which provides an output control pulse to control further alarm apparatus, or which is available as a trigger pulse for other control functions.
  • the flip-flop 5 thus, is a l-input flip-flop which is held its set position by a signal from integrator 4 that changes to reset immediately upon cessation of this signal.
  • the time delay of the combined circuits 4, 5, thus is unilateral.
  • the guide elements 1, 1" may be insulated at their facing surfaces and then actually brought in contact with each other, so long as they are electrically insulated by high quality insulation without leakage paths which might detract from sensing of the thread.
  • the separation of these elements, then, will be that determined by the thickness of the separating, insulating layer.
  • Thread monitor-device particularly for thread handling apparatus in which the thread forms a ballon comprising two hook-shaped thread guides (1', 1") of electrically conductive material, having their hooks located to be spaced from each other, in the direction of thread travel electrically insulated from each other to form, electrically two electrodes, said guides forming mechanically, in the projection of thread travel, a thread guide eye (2);
  • V a source of electrical energy
  • the coupling means comprises coupling capacitors C1, C2).
  • Device further comprising an integrator (4) connected to the differential amplifier and a bistable flip-flop (5) connected to the integrator and changing state when the integrator integrates an output signal from the differential amplifier in a direction representative of presence of a signal.
  • Device further comprising a monostable multivibrator triggered by change of state of said flip-flop and providing an output control pulse.
  • the thread guides (1', 1") are steel wires with a hardened surface of approximately 3 to 4 mm diameter, and are spaced from each other, in the direction of thread travel, by a distance which is sufficient to provide electrical insulation between said guide-electrodes l, l"), in the absence of a thread, and not more than about the diameter of the wires forming said thread guides 1, 1").

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Treatment Of Fiber Materials (AREA)
US00394936A 1972-10-11 1973-09-06 Thread monitor device for textile machinery Expired - Lifetime US3844101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1484372A CH542296A (de) 1972-10-11 1972-10-11 Fadenüberwachungsvorrichtung für Textilmaschinen

Publications (1)

Publication Number Publication Date
US3844101A true US3844101A (en) 1974-10-29

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ID=4404260

Family Applications (1)

Application Number Title Priority Date Filing Date
US00394936A Expired - Lifetime US3844101A (en) 1972-10-11 1973-09-06 Thread monitor device for textile machinery

Country Status (6)

Country Link
US (1) US3844101A (OSRAM)
CH (1) CH542296A (OSRAM)
DE (2) DE7331739U (OSRAM)
FR (1) FR2203373A5 (OSRAM)
GB (1) GB1379720A (OSRAM)
IT (1) IT995364B (OSRAM)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028869A (en) * 1974-11-23 1977-06-14 Zinser Textilmaschinen Gmbh Spinning machine with automatic service carriage
US4043107A (en) * 1973-07-06 1977-08-23 Leuze-Electronic Kg Arrangement for automatically controlling the travel speed of yarns, filaments, and the like in machines processing the same
US4481763A (en) * 1981-06-17 1984-11-13 Veb Kombinat Wolle Und Seide Arrangement of electrodes for monitoring thread breakage in ring spinning machines
US5164710A (en) * 1989-12-22 1992-11-17 Maschinenfabrik Rieter Ag Method of obtaining a thread running signal
US5385008A (en) * 1991-09-20 1995-01-31 Nippon Selen Co., Ltd. Yarn break detecting device for spinning machine
US5421529A (en) * 1991-12-12 1995-06-06 Reiter Ingolstadt Spinnereimaschinenbau Ag Process and device for cleaning sensors of a yarn monitoring system

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3010273A (en) * 1958-11-25 1961-11-28 Adams Inc Stop motion for roving frame
US3043991A (en) * 1962-07-10 figure
US3114233A (en) * 1959-05-20 1963-12-17 Guri Antonio Viaplana Automatic electronic system for the control of sliver ruptures in roving frames
US3132466A (en) * 1959-06-29 1964-05-12 Preisser Gunther Device for indicating thread breakage particularly in spinning machines
US3158852A (en) * 1960-08-23 1964-11-24 Gordon E Schacher Apparatus and procedure for sensing passage of moving thread or the like
US3701247A (en) * 1970-05-16 1972-10-31 Barmag Barmer Maschf Automatic switch-off assembly for feed spools in textile machines
US3772524A (en) * 1972-01-03 1973-11-13 Leesona Corp Digitalized speed sensitive moving strand detection apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043991A (en) * 1962-07-10 figure
US3010273A (en) * 1958-11-25 1961-11-28 Adams Inc Stop motion for roving frame
US3114233A (en) * 1959-05-20 1963-12-17 Guri Antonio Viaplana Automatic electronic system for the control of sliver ruptures in roving frames
US3132466A (en) * 1959-06-29 1964-05-12 Preisser Gunther Device for indicating thread breakage particularly in spinning machines
US3158852A (en) * 1960-08-23 1964-11-24 Gordon E Schacher Apparatus and procedure for sensing passage of moving thread or the like
US3701247A (en) * 1970-05-16 1972-10-31 Barmag Barmer Maschf Automatic switch-off assembly for feed spools in textile machines
US3772524A (en) * 1972-01-03 1973-11-13 Leesona Corp Digitalized speed sensitive moving strand detection apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043107A (en) * 1973-07-06 1977-08-23 Leuze-Electronic Kg Arrangement for automatically controlling the travel speed of yarns, filaments, and the like in machines processing the same
US4028869A (en) * 1974-11-23 1977-06-14 Zinser Textilmaschinen Gmbh Spinning machine with automatic service carriage
US4481763A (en) * 1981-06-17 1984-11-13 Veb Kombinat Wolle Und Seide Arrangement of electrodes for monitoring thread breakage in ring spinning machines
US5164710A (en) * 1989-12-22 1992-11-17 Maschinenfabrik Rieter Ag Method of obtaining a thread running signal
US5385008A (en) * 1991-09-20 1995-01-31 Nippon Selen Co., Ltd. Yarn break detecting device for spinning machine
US5421529A (en) * 1991-12-12 1995-06-06 Reiter Ingolstadt Spinnereimaschinenbau Ag Process and device for cleaning sensors of a yarn monitoring system

Also Published As

Publication number Publication date
DE2344068A1 (de) 1974-05-02
IT995364B (it) 1975-11-10
DE7331739U (de) 1975-01-02
CH542296A (de) 1973-09-30
FR2203373A5 (OSRAM) 1974-05-10
GB1379720A (en) 1975-01-08

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