US3447213A - Method and apparatus for detecting irregularities in a moving sheet of yarn - Google Patents

Method and apparatus for detecting irregularities in a moving sheet of yarn Download PDF

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Publication number
US3447213A
US3447213A US696242A US3447213DA US3447213A US 3447213 A US3447213 A US 3447213A US 696242 A US696242 A US 696242A US 3447213D A US3447213D A US 3447213DA US 3447213 A US3447213 A US 3447213A
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United States
Prior art keywords
detecting means
yarn
sheet
detecting
signal
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Expired - Lifetime
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US696242A
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English (en)
Inventor
Sieme Dost
Michiel J Duncker
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Akzona Inc
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American Enka Corp
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    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02H—WARPING, BEAMING OR LEASING
    • D02H13/00—Details of machines of the preceding groups
    • 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
    • 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
    • B65H2701/38—Thread sheet, e.g. sheet of parallel yarns or wires

Definitions

  • This invention relates to a method and apparatus for detecting slubs and/or other irregularities in a moving sheet of yarns, threads or the like filamentary materials. More particularly, this invention relates to a method especially suitable in the warping process, for detecting irregularities in a yarn sheet with at least two photoelectric detecting means which are spaced along the direction of travel of the yarn sheet, and which can provide a warning signal or a signal to stop the sheet upon detection of an irregularity and to an apparatus for carrying out this method.
  • a method and apparatus similar to those of this invention are known.
  • the known apparatus is often so constructed that two photoelectric detecting members produce a signal which, by way of a transmission system, stops the yarn sheet moving along at the normal or usual operating speed of, for instance, 400 meters per minute.
  • the warping machine is with this known method and apparatus stopped rather frequently by one of the detecting members.
  • each photoelectric detecting member substantially consists of a light source, which is located on one side of the yarn sheet and which emits its light beam across the top and the bottom of the yarn sheet to a photoelectric pickup located on the other side of the yarn sheet.
  • this invention provides a method and apparatus which do not show the disadvantages of the above-described method and apparatus.
  • this invention comntemplates a method of detecting irregularies in a moving sheet of yarn or like filamentary material, particularly in the warping process during the winding of the yarn sheet from or onto a yarn package, with the aid of at least two photoelectric detecting means placed one after the other along the path of the yarn sheet, which comprises producing a signal with a first photoelectric detecting means when an irregularity in the sheet is observed by the first detecting means, reducing the speed of the yarn sheet in response to the signal, producing a second signal with a second photoelectric detecting means spaced downstream of the first detecting means when the same irregularity is observed by the second detecting means and stopping the movement of the yarn sheet in response to the second signal.
  • the yarn sheet is, because of its lower speed, arrested relatively rapidly so that the observed slub will always be found at practically the same relatively short distance downstream of the second detecting means.
  • the percentage of false stops of the warping machine will practically be reduced to zero because the second photoelectric detecting means observes the yarn sheet in a steadier condition.
  • the method according to the invention will produce good results if in the case of detection of an irregularity by the first detecting means, the speed of the yarn sheet is reduced to a value which does not exceed about percent of that of the normal or usual operating speed of the sheet.
  • the method of this invention is particularly effective when a correction signal is produced for increasing the speed of the yarn sheet to the normal operating speed if the irregularity in the yarn observed by the first detecting means is not observed by the second detecting means.
  • the correction signal can be produced in a simple manner by a time switch, which is actuated by the output signal of the first detecting means.
  • the time switch may be stopped by an output signal of the second detecting means.
  • the preferred embodiment of the method of the invention is characterized in that the output signals of the first and the second detecting means automatically reduce the speed of the yarn sheet and stop the yarn sheet, respectively, by way of a transmission means.
  • the invention is further characterized in that the first detecting means, upon observing an irregularity, produces a signal for actuating the second detecting means, and in that after a predetermined time delay a correction signal is produced which deact-uates the second detecting means.
  • This invention is also directed to an apparatus for carrying out the above-described detection method, comprising a frame; means, provided with a driving means or mechanism and a transmission means, for winding or unwinding a sheet of a large number of parallel yarns or like filamentary materials; guide means for guiding the yarns substantially in one plane; and at least two photo'- electric detecting means spaced some distance apart along the path of the yarns for detecting slubs and/or other irregularities in the yarns and for controlling operation of the driving means.
  • the first detecting means is, via the transmission means, so coupled with the driving means that when the first detecting means observes an irregularity in the yarn, the speed of the yarn sheet is reduced, and the second detecting means, placed downstream of the first detecting means, is so coupled with the driving means via the transmission means, that if the same irregularity is also observed by the second detecting means, the movement of the yarn sheet is stopped.
  • FIGURE 1 represents a schematic side view of the apparatus of the invention positioned along the path of the yarn sheet on a warping machine;
  • FIGURE 2 represents a schematic plan view of the apparatus on the warping machine, including a block diagram of the detecting means of the invention.
  • the reference number 1 designates a yarn sheet composed of a few thousand yarns on a warping machine.
  • Each of the yarns is supplied to the warping machine 2 in the direction indicated by an arrow from a creel (not shown), which, as viewed in the drawings, is mounted on the left end of the apparatus.
  • a creel (not shown), which, as viewed in the drawings, is mounted on the left end of the apparatus.
  • each yarn of the sheet 1 is unwound over-end from a yarn package 3.
  • the schematic FIGURE 1 only shows one of the yarn packages. Before the yarns reach the warping machine 2, they are passed through a number of guiding members (not shown).
  • the warping machine comprises a frame (a portion of which is shown in FIGURE 2 and designated by reference numeral 2') which carries the essential parts of the apparatus of the invention.
  • the apparatus of the invention including the warping machine, viewed in the direction of movement of the yarn, successively comprises an eyeboard 4, a guide bar 5 with a felt strip 6, a reed 7 for separating the yarns, a first detecting means including a light source 8 and a photoelectric pickup 9, a guide bar 10, a reed 11, a second detecting means including a light source 12 and a photo electric pickup 13, a member 14 for detecting broken ends in the sheet 1, a reed 15, a guide bar 16, and a yarn package or warp beam 17.
  • the warp beam can accommodate a yarn sheet that is dozens of kilometers long and is in an appropriate manner rotatably mounted in the frame of the warping machine.
  • the warp beam 17 is provided with an appropriate driving and control mechanism 18 (shown in FIGURE 2) for rotating the Warp beam at the desired speed.
  • the method and apparatus of this invention for detecting slubs or other irregularities in the yarns of the yarn sheet 1 will now be further described particularly with reference to the block diagram in the lower part of FIGURE 2.
  • the light beams of the first and the second photoelectric detecting means are indicated by the reference numerals 19 and 20, respectively. Each light beam travels partly below and partly above the yarn sheet 1 in a direction transverse to the direction of the movement of the sheet. The direction of movement or travel of the yarn is indicated by an arrow 21.
  • the pickup 9 produces a signal, which may be appropriately amplified or transduced, and which is supplied to the control and driving mechanism 18 of the warp beam 17 by way of a lead or line conductor 22.
  • the 4 signal by way of a suitable transmission means, effects a reduction of the speed of the yarn sheet to a value which is, for instance, not more than about of that of the normal operating speed.
  • the output signal of the pickup 9 actuates the pickup 13 of the second detecting means via the lead or line 23.
  • the output signal of the pickup 9 is, by way of the lead 24, also supplied to the time switch 25.
  • the circuit (of the apparatus) and the transmission means must be such that the yarn sheet 1 moves at the reduced speed before a slub which has been observed by the first detecting means reaches the second detecting means.
  • the pickup 13 supplies, via lead 26, a signal to the control and driving mechanism 18.
  • the output signal of the pickup 13 also stops the time switch 25. Consequently the time switch is immediately reset to its initial position.
  • the warper i.e. the operator, seeks the slub in the yarn sheet 1 and removes it. Owing to the reduced speed of the sheet and the rapid switching and braking of the apparatus the slub will, after the yarn sheet 1 has been stopped, be found along the area designated by the dash line 29 which is a practically constant distance (designated by reference numeral 28) upstream of the light beam 20.
  • the warper then manually re-starts the machine, the yarn sheet 1 regaining its full speed and the pickup 13 being automatically put out of action.
  • the pickup 9 detects a pseudo-slub (i.e. a false indication of a slub) the speed of the yarn sheet 1 is in the above-described manner reduced, the time switch 25 is started and the pickup 13 is put into action.
  • the time switch 25 by way of the lead 30, supplies a correction signal to the control and driving mechanism 18 of the warp beam.
  • the speed of the yarn sheet is, by way of the transmission means, returned to its normal operating value, and the pickup 13 is, via the lead 31, put out of action again.
  • a method for detecting slubs and other irregularities in a moving sheet of yarn during the winding of the yarn sheet in a warping process with the aid of at least two photoelectric detecting means placed one after the other along the path of the yarn sheet which comprises producing a signal with a first photoelectric detecting means when an irregularity in the yarn sheet is observed by said first detecting means, reducing the speed of the yarn sheet in response to said signal, producing a second signal with a second photoelectric detecting means spaced downstream of the first detecting means when the same irregularity is observed by the second detecting means, and stopping the movement of the yarn sheet in response to the second signal.
  • the method of claim 1 which further comprises producing a correction signal if the irregularity observed in the yarn sheet by the first detecting means is not observed by the second detecting means and thereafter increasing the speed of the yarn sheet to its normal operating speed in response to said correction signal.
  • An apparatus for detecting slubs and other irregularities in a moving sheet of yarn which comprises means, provided with a driving means and a trans-mission means, for winding a large number of parallel yarns, guide means for guiding the yarns substantially in one plane, and at least two photoelectric detecting means spaced some distance apart along the path of the yarns for detecting irregularities in the yarns; a first of said detecting means being, by way of the transmission means, so coupled with said driving means that when the first detecting means observes an irregularity in the yarn, the speed of the yarn sheet is reduced, and the second detecting member, placed downstream of the first detecting member being by way of the transmission means, so coupled with said driving means that if the same irregularity is also observed by the second detecting means, the movement of the yarn sheet is stopped.
  • An apparatus for detecting slubs and other irregularities in a moving sheet of yarns which comprises warping means for transporting a sheet of yarns within a plane, and at least two photoelectric detecting means 5 coupled to the warping means, and arranged along the 15 ing means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Warping, Beaming, Or Leasing (AREA)
US696242A 1967-01-11 1968-01-08 Method and apparatus for detecting irregularities in a moving sheet of yarn Expired - Lifetime US3447213A (en)

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Application Number Priority Date Filing Date Title
NL6700367A NL6700367A (xx) 1967-01-11 1967-01-11

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543360A (en) * 1968-12-13 1970-12-01 Appalachian Electronic Instr Yarn inspector
US3677307A (en) * 1969-06-27 1972-07-18 Georges P Fiorucci Arrangement provided with a photo-cell and controlling the detecting means and the stop motion in a loom upon breaking of a thread in the warping, weaving and knitting systems
US3685306A (en) * 1970-10-29 1972-08-22 Texaco Inc Subsea pipe laying apparatus and method
US3717771A (en) * 1971-04-02 1973-02-20 Lindly & Co Inc System for detecting defects in continuous traveling material
US3786265A (en) * 1973-02-02 1974-01-15 Lindly Company Inc Apparatus for detecting defects in continuous traveling material
US3818236A (en) * 1971-08-23 1974-06-18 Nordiska Maskinfilt Ab Apparatus for detecting broken threads or other disturbances in a fibre web
US3848438A (en) * 1972-10-28 1974-11-19 Toyo Boseki Apparatus for successively processing continuously connected textile fabric
US3869770A (en) * 1973-08-10 1975-03-11 Deering Milliken Res Corp Tight warp detector
US5313692A (en) * 1992-01-24 1994-05-24 Tsudakoma Kogyo Kabushiki Kaisha Warp yarn breakage detecting system
WO1994027902A1 (en) * 1993-05-24 1994-12-08 Courtaulds Fibres (Holdings) Limited Manufacture of solvent-spun cellulose fibre and quality control detection means therefor
WO1994027903A1 (en) * 1993-05-24 1994-12-08 Courtaulds Fibres (Holdings) Limited Manufacture of crimped solvent-spun cellulose fibre and quality control detection means therefor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1768746A (en) * 1928-01-27 1930-07-01 Cocker Machine And Foundry Com Apparatus to prepare yarns for weaving
US2967947A (en) * 1956-10-04 1961-01-10 Du Pont Sheet inspection method and apparatus
US3174046A (en) * 1961-09-05 1965-03-16 Lindly & Company Inc Photodynamic monitor for inspecting spun yarns
GB996181A (en) * 1961-10-02 1965-06-23 Lindly & Company Inc Automatic yarn inspector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1768746A (en) * 1928-01-27 1930-07-01 Cocker Machine And Foundry Com Apparatus to prepare yarns for weaving
US2967947A (en) * 1956-10-04 1961-01-10 Du Pont Sheet inspection method and apparatus
US3174046A (en) * 1961-09-05 1965-03-16 Lindly & Company Inc Photodynamic monitor for inspecting spun yarns
GB996181A (en) * 1961-10-02 1965-06-23 Lindly & Company Inc Automatic yarn inspector

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543360A (en) * 1968-12-13 1970-12-01 Appalachian Electronic Instr Yarn inspector
US3677307A (en) * 1969-06-27 1972-07-18 Georges P Fiorucci Arrangement provided with a photo-cell and controlling the detecting means and the stop motion in a loom upon breaking of a thread in the warping, weaving and knitting systems
US3685306A (en) * 1970-10-29 1972-08-22 Texaco Inc Subsea pipe laying apparatus and method
US3717771A (en) * 1971-04-02 1973-02-20 Lindly & Co Inc System for detecting defects in continuous traveling material
US3818236A (en) * 1971-08-23 1974-06-18 Nordiska Maskinfilt Ab Apparatus for detecting broken threads or other disturbances in a fibre web
US3848438A (en) * 1972-10-28 1974-11-19 Toyo Boseki Apparatus for successively processing continuously connected textile fabric
US3786265A (en) * 1973-02-02 1974-01-15 Lindly Company Inc Apparatus for detecting defects in continuous traveling material
US3869770A (en) * 1973-08-10 1975-03-11 Deering Milliken Res Corp Tight warp detector
US5313692A (en) * 1992-01-24 1994-05-24 Tsudakoma Kogyo Kabushiki Kaisha Warp yarn breakage detecting system
WO1994027902A1 (en) * 1993-05-24 1994-12-08 Courtaulds Fibres (Holdings) Limited Manufacture of solvent-spun cellulose fibre and quality control detection means therefor
WO1994027903A1 (en) * 1993-05-24 1994-12-08 Courtaulds Fibres (Holdings) Limited Manufacture of crimped solvent-spun cellulose fibre and quality control detection means therefor
US5582843A (en) * 1993-05-24 1996-12-10 Courtaulds Fibres (Holdings) Limited Manufacture of solvent-spun cellulose fibre and quality control means therefor
US5601765A (en) * 1993-05-24 1997-02-11 Courtaulds Fibres (Holdings) Limited Method for manufacturing crimped solvent-spun cellulose fibre of controlled quality

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Publication number Publication date
NL6700367A (xx) 1968-02-26

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