US3452209A - Thread breaks detector having transparent thread guide - Google Patents

Thread breaks detector having transparent thread guide Download PDF

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Publication number
US3452209A
US3452209A US603067A US3452209DA US3452209A US 3452209 A US3452209 A US 3452209A US 603067 A US603067 A US 603067A US 3452209D A US3452209D A US 3452209DA US 3452209 A US3452209 A US 3452209A
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United States
Prior art keywords
thread
light
detector
guide
breaks
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Expired - Lifetime
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US603067A
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English (en)
Inventor
Gagik Melkonjan
Spartak Mikaeljan
Jiri Elias
Miloslav Tyl
Petr Musil
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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
    • B65H63/0324—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 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

Definitions

  • a thread breakage detector in which the thread passes over a member having an opaque guide surface provided with a light-transmitting portion of such size as to be normally covered by the thread. Light is directed at this portion from one side of the member and a photocell is provided on the other side of the member and located in the path of the light. The light can pass through the surface portion to the photocell only if the thread breaks and thereby uncovers the surface portion.
  • This invention relates to a thread breakage detector in general, and to a photoelectric thread breakage detector in particular, wherein breakage of the thread actuates a photosensitive cell which in turn controls other monitoring devices.
  • Known photoelectric thread breakage detectors comprise a source of light, a photosensitive cell influenced thereby, and a guide for the thread arranged therebetween.
  • the thread guides have threadaccommodating apertures which are of circular or polygonal cross-section and which must berelatively large since, when the thread breaks, thread end must be threaded through such apertures to be returned to that part of the thread processing arrangement at which it can be rejoined with the forward end of the thread portion left behind. This obviously requires these apertures to be large enough to permit resonably easy threading of the end of the broken thread therethrough.
  • the required size of these apertures permits excessive radial play of the thread during advancement of the same, in consequence of which the passage of light from the light source to the photosensitive cell is intermittently permitted and interrupted as the thread moves radially in the aperture. This results in actuation of the photocell even when the thread is not broken. Attempts have been made to use weak light sources so that the quantity of light which passes through the aperture when the same is only partially uncovered during radial play of the thread, is not suificient to activate the photocell. However in these cases it is then necessary to provide expensive amplification devices in connection with the photoelectric cell.
  • a thread guide means having a guide surface over which a thread is adapted to pass, said surface having a light transmitting surface portion adapted to be covered by said thread during passage thereof over said United States Patent 3,452,209 Patented June 24, 1969 surface, all portions of said thread guide means other than said light transmitting surface portion thereof being opaque.
  • a detector of the type described considerably simplifies threading of the broken thread ends and thus permits the apertures for the thread to be made much smaller than heretofore possible.
  • FIG. 1 shows a photoelectric thread breakage detector according to the invention in a somewhat schematic perspective view
  • FIG. 2 is a sectional view taken on the line II-II of FIG, 1;
  • FIG. 3 is a view of the thread guide member used in the embodiment of FIGS. 1 and 2, as seen from the right in FIG. 2;
  • PI. 4 is a sectional view taken on the line IV-IV of FIG. 3;
  • FIG. 5 is a view of the thread guide member in FIG. 3, but as seen from the left in FIG. 2;
  • FIG. 6 is a top plan view of FIG. 5;
  • FIG. 7 is a sectional view through another thread guide means for use in the arrangement of FIGS. 1 and 2;
  • FIG. 8 is a sectional view taken on the line VIIIVIII of FIG. 7.
  • the novel thread break detector comprises a housing 1 within which there is located a thread guide means 5.
  • Reference numeral 3 designates part of a light source as will be more fully discussed with respect to FIG. 2.
  • FIG. 2 is a section taken on the line II-II of FIG. 1 and shows the novel detector in more detail.
  • the housing 1 accommodates a light source, such as the light bulb 2 which is held by the socket 3 carried by the housing.
  • the bulb 2 is arranged at one end of the housing 1 and adjacent the other end thereof there is arranged a light-sensitive sensor, such as a photocell 4.
  • a thread guide means is arranged intermediate the bulb 2 and the photocell 4 which is a thread guide means in form of a member 5 which is provided with a thread guiding surface 8.
  • the member 5 is a glass prism or otherwise configurated glass member provided with a groove 7, generally of V-shaped cross section.
  • the groove 7 extends in the direction of movement of a thread 6 which is to pass through the novel detector and communicates with an inlet opening 12 and an outlet opening 11 provided in the housing 1. It is evident from FIG. 2 that the housing 1 comprises a removable cover 10 and that in the illustrated embodiment the outlet opening 11 is formed in this cover 10.
  • the guide surface 8 is assumed to constitute the bottom wall of the V-shaped groove 7 and in accordance with the invention the entire member 5, which of course is normally lighttransmitting, is metal plated to make it opaque. Excepted from such metal plating is the bottom wall of the groove 7, that is the guide surface 8 or, to be more specific, a portion of the guide surface 8.
  • this portion which latter will thus be understood to be translucent, corresponds at most to the cross section of the thread 6 so that in normal operation of the device, that is when the thread 6 passes through the detector, the light-transmitting portion of the surface 8 will be covered by the thread.
  • no light from the bulb 2 can pass to the photocell 4 unless the thread 6 breaks, in which case the light-transmitting portion of the guide surface -8- obviously is uncovered, permitting passage of light to the photocell 4 for activation of the same.
  • FIGS. 36 are various different views of the thread guide member used in the embodiment of FIG. 2. These views are believed to be largely self-explanatory. However, it should be noted that one possible modification is incorporated in FIG. 3, where it is shown that the longitudinal extension of the light-transmitting portion of the surface 8 need not be coincident with the length of this surface as seen in the direction of thread movement. This is indicated with reference numeral 9 where the lighttransmitting portion will be seen to be considerably shorter than the longitudinal extension of the surface '8.
  • FIGS. 7 and 8 show such a member 5 to be made of metal.
  • a substitute arrangement must be provided for the non-metallized light-transmitting portion of the guide surface 8 as outlined above with respect to FIGS. 1-6.
  • this is done by providing an aperture 13 which extends from the guide surface 8 through the remainder of the member 5 and which, evidently, must be aligned with the light source and the photocell 4.
  • FIGS. 7 and 8 this is done by providing an aperture 13 which extends from the guide surface 8 through the remainder of the member 5 and which, evidently, must be aligned with the light source and the photocell 4.
  • the configuration of the guide surface is again assumed to be in the form of a V-shaped groove 7, and it is evident, particularly from FIG. 8, that the aperture 13 is provided in the bottom wall of this groove.
  • the maximum width of the aperture 13, which can be simply a perforation or a slot extending in the direction of movement of the thread 6, will be so selected that the thread 6 covers the aperture under normal operating conditions, that is as long as no breakage has occurred.
  • a photoelectric thread breakage detector for detector for detecting breakage of an advancing thread, in combination, a source of light; photoelectric means located in the path of light emitted by said source; and thread guide means in said path of light between said source and said photoelectric means, said thread guide means having a thread-guiding surface arranged to contact the advancing thread for guiding the same in predetermined direction and being provided with a light-transmitting portion normally covered by said thread during advancement thereof in said direction and in contact with said surface, substantially all other portions of said thread guide means which are located in the path of said light being opaque so that light from said source can impinge upon said photoelectric means only in response to uncovering of said light transmitting portion by said thread.
  • thread guide means comprises a guide member of light-transmitting material having said guiding surface thereon, and further comprising a layer of metal plating provided at least on said guiding surface but leaving said light-transmitting portion exposed.
  • a thread breakage detector as claimed in claim 1 further comprising a housing with a separable cover surrounding said guide means a'nd being provided with an inlet and an outlet for said thread.
  • Thread guide means having a thread contacting guide surface over which a thread is adapted to pass, said surface having a light-transmitting surface portion adapted to be covered by said thread during passage thereof over said surface, all portions of said thread guide means other than said light-transmitting surface portion thereof being opaque.
  • Thread guide means as defined in claim 9, including a thread-guiding groove having said light-transmitting surface portion at the bottom wall thereof.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)
US603067A 1965-12-17 1966-12-19 Thread breaks detector having transparent thread guide Expired - Lifetime US3452209A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS759065 1965-12-17

Publications (1)

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US3452209A true US3452209A (en) 1969-06-24

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US603067A Expired - Lifetime US3452209A (en) 1965-12-17 1966-12-19 Thread breaks detector having transparent thread guide

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US (1) US3452209A (de)
AT (1) AT269694B (de)
CH (1) CH459833A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617133A (en) * 1970-05-20 1971-11-02 Carman H Gibson Microinch-measuring instrumentation system
US3974377A (en) * 1973-01-24 1976-08-10 Dickey-John Corporation Solid state seed sensor
EP0112312A2 (de) * 1982-12-03 1984-06-27 Trelleborg Ab Vorrichtung zur Drahtrissüberwachung
DE4122305B4 (de) * 1991-07-05 2006-01-12 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Vorrichtung zur optoelektronischen Abtastung eines Fadens

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19909703A1 (de) * 1999-03-05 2000-09-07 Schlafhorst & Co W Vorrichtung zur optischen Garnüberwachung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043991A (en) * 1962-07-10 figure
US3142832A (en) * 1961-10-26 1964-07-28 Monsanto Co Monitoring and detection systems for spun filaments

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043991A (en) * 1962-07-10 figure
US3142832A (en) * 1961-10-26 1964-07-28 Monsanto Co Monitoring and detection systems for spun filaments

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3617133A (en) * 1970-05-20 1971-11-02 Carman H Gibson Microinch-measuring instrumentation system
US3974377A (en) * 1973-01-24 1976-08-10 Dickey-John Corporation Solid state seed sensor
EP0112312A2 (de) * 1982-12-03 1984-06-27 Trelleborg Ab Vorrichtung zur Drahtrissüberwachung
EP0112312A3 (de) * 1982-12-03 1986-10-01 Trelleborg Ab Vorrichtung zur Drahtrissüberwachung
DE4122305B4 (de) * 1991-07-05 2006-01-12 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Vorrichtung zur optoelektronischen Abtastung eines Fadens

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Publication number Publication date
CH459833A (de) 1968-07-15
AT269694B (de) 1969-03-25

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