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US3361314A - Yarn guard for checking yarn travel in a textile machine - Google Patents

Yarn guard for checking yarn travel in a textile machine Download PDF

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Publication number
US3361314A
US3361314A US471880A US47188065A US3361314A US 3361314 A US3361314 A US 3361314A US 471880 A US471880 A US 471880A US 47188065 A US47188065 A US 47188065A US 3361314 A US3361314 A US 3361314A
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United States
Prior art keywords
yarn
guard
checking
travel
oscillations
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Expired - Lifetime
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US471880A
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English (en)
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Gith Walter
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Individual
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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • G01L5/106—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means for measuring a reaction force applied on a cantilever beam
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
    • G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
    • 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 guard for checking yarn travel along a path in a textile machine has sensing means located adjacent the yarn travel path and adapted to oscillate mechanically in response to movement of the yarn past the sensing means and to cease oscillating in response to a break in the yarn, and transducing means connected with the sensing means for converting the mechanical oscillations thereof to electrical oscillations.
  • the sensing means has a rod slidingly engageable by the traveling yarn and me chanically oscillatable thereby and the transducer has a piezoelectric crystalline plate.
  • the rod extends substantially perpendicularly to the longitudinal axis of the crystalline plate and is either connected directly by an end thereof to a side of the plate or to one end of a substantially L-shaped support member secured by its other end to an end of the crystalline plate.
  • My invention relates to a yarn guard for checking yarn travel in a textile machine.
  • Yarn guards in textile machines serve for checking the yarn travel, i.e. to determine if the yarn is traveling in an orderly manner or if a break in the yarn has occurred.
  • the known yarn guards are responsive either to break down or collapse of the yarn tension when a yarn break occurs, or to absence of the yarn.
  • Those yarn guards which are responsive to absence of the yarn have a disadvantage in that they react relatively slowly or do not react at all to the yarn break, a consequence thereof being that the yarn slides out of the yarn guard after the yarn breaks.
  • those yarn guards that respond to the collapse of the yarn tension it is possible that the yarn will break at a location which is relatively distant from the yarn guard, so that the yarn tension will not vanish im mediately.
  • a feeler or sensing member located adjacent the traveling yarn and oscillatable thereby, the sensing member being connected to a transducer adapted to convert mechanical oscillations to electrical oscillations.
  • My invention makes use of the principle that a moving yarn can cause oscillations in a sensing member located adjacent thereto like for example a violin bow to a violin string.
  • the oscillations of the sensing member that are thus produced can be converted to electrical oscillations with conventional transducers.
  • Transducers that can be employed therefore can be of the electrokinetic type such as microphones based on the transmission of sound through a solid for instance or sound pickup systems based on the principle of the carbon microphone, which are operative capacitively, inductively, magnetostrictively or piezoelectrically.
  • the type of oscillations produced in the sensing member by the running yarn is per se immaterial. Resonance oscillations as well as other oscillations of the sensing member can be used for the checking process. In some cases it is even possible to cause the sensing member to oscillate solely by the engagement therewith of the individual fibers standing away from the yarn.
  • FIGS. 1 and 2 are perspective views of two embodiments of the yarn guard constructed in accordance with my invention.
  • FIG. 3 is a diagram of an electrical circuit suitable for use with the embodiments of FIGS. 1 and 2;
  • FIGS. 3A, 3B and 3C are modified portions of the circuit of FIG. 3.
  • a yarn F which is guided by means of the yarn guide 1 which may have originally been provided with the textile machine (not shown) or by an auxiliary yarn guide which may have subsequently been added to the machine, over a sensing member 2 comprising an oscillatable rod.
  • the sensing member 2 is provided with an elastically secured layer or tube 3 of sintered corundum or any other suitable component resistant to frictional wear which, due to its great hardness or toughness, prevents abrasion of the sensing member 2.
  • the sensing member 2 is connected to a vibration transducer 4 which in the illustrated embodiment in FIG.
  • the piezoelectric crystalline plate 5 is thereby set in oscillation by the sensing member 2. These mechanical oscillations produce electrical voltage oscillations which can be taken off the terminal contacts 6.
  • the piezoelectric crystalline plate 5 is mounted in elastic holders 7 of rubber or elastomer material, for example. In order to achieve the greatest possible damping of the oscillations, the sensing member 2 is also located in an elastic holder 8 of a material similar to that of the holders 7.
  • the free end of the sensing member 2 is provided with a device 9 for limiting the deflections of the sensing member 2, also consisting of elastic material similar to that of the holders 7 and 8.
  • the deflection-limiting device nevertheless does not normally interfere with the oscillations of the sensing member 2 or the tube 3 of sintered corundum that are produced by the traveling yarn F.
  • FIG. 2 shows an embodiment of a yarn guard that operates in accordance with the same principles as the embodiment of FIG. 1, the elements in FIG. 2 corresponding to Similar elements in FIG. 1 being given the same reference numerals.
  • the piezoelectric vibration transducer 4 is excited at one of its ends rather than one of its sides as for the embodiment of FIG. 1.
  • an L-shaped member extends from the end of the transducer 4 in the embodiment of FIG. 2 for supporting the sensing member 2.
  • the electrical oscillations originating in the vibration transducer 4 can be employed for indicating or detecting the yarn break, for shutting off the machine or for releasing automatic control actions by means of a suitable circuit as shown, for example, in FIG. 3.
  • a warping machine for example, is to be monitored whereby every individual yarn issuing from the warp frame is provided with a yarn guard.
  • the electrical voltage produced by the oscillation transducer is applied at the terminals E and E It is consequently immaterial whether this electrical voltage derives from a piezoelectric pickup 10, as shown in FIG. 3, or an inductive pickup 11, as shown in FIG. 3a, a magnetostrictive pickup, a Hall generator, or a capacitive pickup 12, as shown in FIG. 3b, or a carbon microphone pickup 13, as shown in FIG. 30.
  • the yarn guard of this invention differs, however, from the known yarn guards such as dropwire for example by a fundamental relationship.
  • the known yarn guards something takes place when the yarn breaks, for example, a contact closes mechanically due to the swing of the dropwire.
  • the yarn guard of the present invention something is caused to stop, namely the oscillations of the sensing member produced by the traveling yarn.
  • something In order to stop the winding operation at the breaking of a yarn for example, something must occur however, as in the case of a dropwire. For this reason it is necessary to install a reversing member for the yarn guard constructed in accordance with my invention. This is accomplished as follows:
  • the resistances 14 and 15 are connected through the terminals 13,, B with the negative and positive poles respectively of a direct voltage source.
  • the vibration transducers 10-13 respectively, connected to the terminals E E causes a positive voltage to be applied through the diode 16 at the point A to charge the capacitor 20, the appropriate diode of the diode gate being blocked thereby.
  • the negative voltage from the contact terminal B can thereby modulate a circuit amplifier 18, common to all the yarn, through the resistance 14 and the diode 170 so as to energize the electromagnet 19 for example, to turn off the machine.
  • the amplifier 18 is of conventional construction and is connected through the contact terminals C C with an electrical energizing source.
  • a pickup requiring a high ohmic input circuit for example a piezoelectric pickup 10
  • a piezoelectric pickup 10 is employed as oscillation transducer
  • silicon diodes 17a-17e particularly when many yarn guards are combined through a common amplifier 18 as in the illustrated embodiment of FIG. 3.
  • the silicon diodes 17a17e then decouple the individual yarn guards so that each yarn guard can furnish a clear switching signal, specifically identifying it, to the amplifier 18 independently of the other yarn guards. Consequently, for example with a warp frame, a determination of the particular yarn that is broken can also be achieved thereby.
  • the yarn guard constructed in accordance with my invention is not restricted only to checking yarn movements in the axial or travel direction of the yarn but rather also for checking yarn movements in other directions. It is thus, for example, possible to check the traverse direction of the warn for example at the yarn guide drums of a winding machine.
  • Yarn guard for checking yarn travel along a path in a textile machine, comprising sensing means located adjacent the yarn travel path, said sensing means being adapted to oscillate mechanically in response to movement of the yarn past said sensing means and to cease oscillating in response to a break in the yarn, and transducing means connected with said sensing means for converting the mechanical oscillations thereof to electrical oscillations.
  • Yarn guard for checking yarn travel along a path in a textile machine comprising sensing means having a rod slidingly engageable by the traveling yarn and mechanically oscillatable thereby, said rod being disengageable by the yarn upon the occurrence of a break in the yarn whereby said rod ceases to oscillate, and a transducer operatively connected to an end of said rod for converting the mechanical oscillations thereof to electrical e timat ons.
  • said transducer comprises a piezoelectrical crystalline plate, said rod extending substantially perpendicular to the longitudinal axis of said crystalline plate and being connected by said end to a side of said plate.
  • said transducer comprises a piezoelectrical crystalline plate, said rod extending substantially perpendicular to the longitudinal axis of said crystalline plate, a substantially L- shaped support member secured by one end thereof to an end of said crystalline plate and by the other end thereof to said end of said rod.
  • Yarn guard according to claim 2 wherein at least the portion of said rod slidingly engageable by the traveling yarn has a layer of material resistant to frictional wear.
  • Yarn guard according to claim 2 wherein the other end of said rod is free, and the yarn guard comprises means for limiting deflections of said mechanically oscillatable rod.
  • a yarn guard for checking yarn travel along a path in the textile machine, said yarn travel path guard comprising sensing means located adjacent the yarn, said sensing means being References Cited UNITED STATES PATENTS 2,506,174 5/1950 Price 2864 2,522,492 9/ 1950 Anderson 58-130 X 3,140,604 7/1964 Bernet 2864 X 3,153,312 10/1964 Bushey 22611 X 3,188,192 6/1965 Parobeck et al 226-11 X FOREIGN PATENTS 1,141,212 12/1962 Germany.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US471880A 1964-07-15 1965-07-14 Yarn guard for checking yarn travel in a textile machine Expired - Lifetime US3361314A (en)

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Application Number Priority Date Filing Date Title
DER0038378 1964-07-15

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US (1) US3361314A (de)
CH (1) CH440073A (de)
GB (1) GB1049983A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429491A (en) * 1967-05-08 1969-02-25 Du Pont Break detector and shut down means
US3688958A (en) * 1970-11-16 1972-09-05 Rydborn S A O Device for sensing thread passage to control machine operation
EP0028425A1 (de) * 1979-09-13 1981-05-13 "BARCO ELECTRONIC N.V." abbreviated into "Barco" Elektronischer Fadenwächter
US4420123A (en) * 1981-10-19 1983-12-13 The United States Of America As Represented By The Secretary Of The Army Force rate sensor assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH629456A5 (de) * 1978-06-19 1982-04-30 Loepfe Ag Geb Elektronische einrichtung zur ueberwachung einer mehrzahl laufender faeden an einer textilmaschine.
US4429651A (en) * 1979-08-06 1984-02-07 Tokai Kogyo Mishin Kabushiki Kaisha Device for detecting absence of a thread in a sewing machine
SE448749B (sv) * 1982-05-17 1987-03-16 Rydborn S A O Anordning for overvakning av undertraden i symaskiner
US5136202A (en) * 1990-08-31 1992-08-04 Atochem North America, Inc Material sensor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506174A (en) * 1946-05-10 1950-05-02 Clark Thread Co Electronic thread clearer
US2522492A (en) * 1946-05-29 1950-09-19 Crystal Res Lab Inc Electronic metronome
DE1141212B (de) * 1961-07-29 1962-12-13 Walther Wegener Dr Ing Vorrichtung zum selbsttaetigen Vergleichmaessigen von Faserbaendern beim Verstrecken
US3140604A (en) * 1960-04-05 1964-07-14 Inst Textile Tech Fuzz meter
US3153312A (en) * 1962-04-17 1964-10-20 Leesona Corp Feed roll unit for textile machines
US3188192A (en) * 1961-11-02 1965-06-08 Pittsburgh Plate Glass Co Apparatus for continuously drawing sheet glass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506174A (en) * 1946-05-10 1950-05-02 Clark Thread Co Electronic thread clearer
US2522492A (en) * 1946-05-29 1950-09-19 Crystal Res Lab Inc Electronic metronome
US3140604A (en) * 1960-04-05 1964-07-14 Inst Textile Tech Fuzz meter
DE1141212B (de) * 1961-07-29 1962-12-13 Walther Wegener Dr Ing Vorrichtung zum selbsttaetigen Vergleichmaessigen von Faserbaendern beim Verstrecken
US3188192A (en) * 1961-11-02 1965-06-08 Pittsburgh Plate Glass Co Apparatus for continuously drawing sheet glass
US3153312A (en) * 1962-04-17 1964-10-20 Leesona Corp Feed roll unit for textile machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429491A (en) * 1967-05-08 1969-02-25 Du Pont Break detector and shut down means
US3688958A (en) * 1970-11-16 1972-09-05 Rydborn S A O Device for sensing thread passage to control machine operation
EP0028425A1 (de) * 1979-09-13 1981-05-13 "BARCO ELECTRONIC N.V." abbreviated into "Barco" Elektronischer Fadenwächter
US4420123A (en) * 1981-10-19 1983-12-13 The United States Of America As Represented By The Secretary Of The Army Force rate sensor assembly

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CH440073A (de) 1967-07-15
GB1049983A (en) 1966-11-30

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