US3763373A - Defect detector for a moving web - Google Patents

Defect detector for a moving web Download PDF

Info

Publication number
US3763373A
US3763373A US00234966A US3763373DA US3763373A US 3763373 A US3763373 A US 3763373A US 00234966 A US00234966 A US 00234966A US 3763373D A US3763373D A US 3763373DA US 3763373 A US3763373 A US 3763373A
Authority
US
United States
Prior art keywords
web
cylinder
plate
movement
path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00234966A
Inventor
E Baber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Application granted granted Critical
Publication of US3763373A publication Critical patent/US3763373A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • 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

Definitions

  • An apparatus for detecting irregularities, such as hard defects and varying tension, in a continuous web moving in a path includes a cylinder mounted for eccentric movement about an axis above and transverse to said web and a plate mounted for angular movement about the same axis. The lower edge of the plate is transverse to and engages the web and a guide positioned below the web and adjacent the cylinder directs the web into engagement with the outer surface of the cylinder. Means are provided to detect movement of the cylinder and the plate occasioned by irregularities in the web.
  • This invention concerns apparatus for monitoring irregularities in moving continuous textile materials. More specifically, the apparatus of this invention detects, records and operates machine stop mechanisms 1 in response to occurrences of not only knots, or other hard defects, but also fiber entanglements, varying web tension and product discontinuities, such as runouts and partial or full breaks in a textile ribbon, rope or tow.
  • textile ribbon, rope or tow as used in this specification is meant a nontwisted band of numerous parallel continuous filaments gathered together to be processed as an entity such as by drawing, heat treating, crimping and cutting to staple fibers or direct spinning into sliver or spun yarn.
  • the multiple strand is transported in the form of a relatively flat or web-like form. When the strand is in this form, it is in condition for monitoring by the apparatus of this invention.
  • these types of materials will be called webs hereafter.
  • defect detectors for monitoring a moving web is disclosed in the art. Although each may be satisfactory for the detection of a specific type of defect, none provides a consolidated structure capable of simultaneously detecting physical defects in a web as well as undesirable changes in web tension. Formerly, in order to detect these several types of defects, it was necessary to employ more than one type of defect detector. In some processing steps, space limitations dic tate the need for a consolidated defect detector. The present invention fulfills this need.
  • An apparatus for detecting irregularities in a continuous web moving in a path comprising a shaft positioned above and transverse to said path; a cylinder mounted for eccentric movement about said shaft, said cylinder having an outer surface engaging said web; a guide positioned below said path adjacent said cylinder for directing said web against said outer surface; a plate mounted for angular movement about said shaft, said plate having a lower edge transverse to and engaging said web; and means for detecting movement of said cylinder and said plate occasioned by irregularities in the moving web.
  • the cylinder and plate may be biased against movement occasioned by the movement of the web along the path.
  • FIG. 1 web is transported by a processing machine from a source not shown under a detector 11 is used in connection with a textile tow-tostaple cutter.
  • a cylindrical guide 16 is mounted for eccentric movement about shaft 13.
  • Guide 16 is hollow and has part of its wall cut out to receive a combined feeler plate and light shield member 20 whcih is also mounted for angular movement about shaft 13.
  • Two guide motion limiters 30 are attached to shaft 13. These limiters are constructed and arranged to limit the angular movement of cylindrical guide 16 about shaft 13.
  • a bolt 32 is threaded into element 30 and provided with a hook 34 to receive a spring 36 which is stretched and fastened to a second hook 38 fixed to cylindrical guide 16 at an appropriate location on its inner surface.
  • a similar biasing arrangement may be associated with the second guide motion limiter at the other end of shaft 13.
  • a spring biasing arrangement may be provided for plate member 20 if found necessary although in the preferred embodiment such a biasing mechanism is not needed and member 20 swings freely within limits.
  • a light source and photoelectric receiver combination 40 is mounted centrally on the back member of bracket 14.
  • a cable 42 extends from this combination to a power source and to alarm, recorder and machine drive stop mechanisms not shown.
  • a base plate assembly 44 is mounted below guide 16 and positioned so that tip 46 urges web 10 toward guide 16.
  • Plate 44 is hinged about shaft 48 and is spring loaded by a mechanism not shown to bias plate 44 toward cylinder 16.
  • the cylindrical guide is seen to comprise a hollow, cylindrical shell 17 cut away to provide an opening for plate member 20.
  • Two webs l8, 19 are welded inside shell 17, perpendicular to its central axis, at symmetrical locations in from the ends of the shell.
  • Two cylindrical bearing housings 211, 22 are welded respectively to webs l8, 19. The axes of these housings are parallel to but displaced from the central axis of the shell.
  • a light reflecting spot 15 is provided on the outer surface of shell 17 approximately midway between the two ends of the shell above the opening.
  • the integrated feeler plate and light shield 20 comprises a shaped plate 23, of length sufficient to approximately span the width of the web being monitored, welded to two frame plates 24, 25 on one sloped edge thereof.
  • a pair cylindrical bearing housings 27, 28 are welded to the outboard surfaces of plates 24, 25, respectively.
  • a light shield 26 of elongated, rectangular shape is mounted on another edge of frame plates 24, 25. Plates 24, 25 are shaped so that plate 23 and shield 26 are fixed at different positions approximately 30 apart around the axis of bearing housings 27, 28.
  • the spacings of frame plates 24, 25 and bearings 27, 28 are arranged so that, when mounted on fixed shaft 13 along with guide 16, housings 27, 28 fit along shaft 13 between housings 21, 22.
  • Bearing inserts of nylon or other low friction material are provided in housings 21, 22 and 27, 28.
  • Guide motion limiters 30 take the shape of solid partial cylinders. These limiters are mounted to shaft'13 inside guide 16 but outboard of bearing housings 21, 22.
  • the defect detector is mounted as shown in FIG. 1 with a guide 12 and companion guide not shown located to introduce the web to be monitored first in between base plate 44 and cylindrical guide 16, thence across feeler plate 23 and on to further processing apparatus such as a staple cutter.
  • a knot, entanglement or other hard defect arrives between plate 44 and guide 16, the latter will be forced up and away from its normal position in such a way that the light reflecting spot 15 will be moved out of line with the beam of light from light source 40. This causes an electrical impulse to be generated by the photoelectric detector.
  • base plate 44 will also be moved against its spring loading and deflect about axis 48. This flexibility also facilitates the stringing up of the web at startup.
  • plate 23 rides on the top surface of the web.
  • plate 23 will fall downward thus causing angular movement of the member 20 about shaft 13.
  • This brings shield 26 downward to mask reflecting spot 15.
  • the resulting change in illumination on the photoelectric detector provides an electrical signal as before. These signals are used in operating alarms, a recorder, and/or shutting down the web transport machine.
  • plate 23 or guide 16 will be moved in such a way that again a photoelectric signal will be provided to operate alarms, etc.
  • a novel means for monitoring a moving length of textile ribbon, rope or tow in order to detect and provide signals upon the occurrence of several kinds of defects by means of one consolidated defect detector.
  • Hard defects such as knots and tangles, can be detected.
  • Increases or decreases in tension due either to a web break or a stoppage in the supply or a partial runout of the web structure can be monitored by the same apparatus.
  • asingle detector is able to perform the function which in the past has required three or four monitoring instruments.
  • This invention therefore, yields not only improved convenience but also decreased cost. In some cases where space restricts the installation to one monitoring device, the present invention permits the monitoring of defects that could not previously be detected in such situations.
  • An apparatus for detecting irregularities in a continuous web moving in a path comprising a shaft positioned above and transverse to said path; a cylinder mounted for eccentric movement about said shaft, said cylinder having an outer surface engaging said web; a guide positioned below said path adjacent said cylinder for directing said web against said outer surface; a plate mounted for angular movement about said shaft, said plate having a lower edge transverse to and engaging said web; a light-photocell combination located in a fixed position relative to said cylinder and said plate, said combination illuminating a portion of said cylinder and detecting illumination of said cylinder, said illumination changing with relative movement of said cylinder and said plate occasioned by irregularities in the moving web.

Abstract

An apparatus for detecting irregularities, such as hard defects and varying tension, in a continuous web moving in a path includes a cylinder mounted for eccentric movement about an axis above and transverse to said web and a plate mounted for angular movement about the same axis. The lower edge of the plate is transverse to and engages the web and a guide positioned below the web and adjacent the cylinder directs the web into engagement with the outer surface of the cylinder. Means are provided to detect movement of the cylinder and the plate occasioned by irregularities in the web.

Description

[ 1 Oct. 2, 1973 1 1 DEFECT DETECTOR FOR A MOVING WEB [75] lnventor: Ernest Greenberry Baber,
Waynesboro, Va.
[73] Assignee: E. l. du Pont de Nemours and Company, Wilmington, Del.
22 Filed: Mar. 15, 1972 21 Appl. No.: 234,966
[56] References Cited UNITED STATES PATENTS I 3,327,398 6/1967 Leslie 250/219 DF 3,666,951 5/1972 Gertung... 250/219 DF 3,334,239 8/1967 Nash 250/219 DF 3,363,107 1/1968 Martin 250/219 WE 3,219,829 11/1965 Reist 250/223 3,363,458 1/1968 Scharf 1 7 73/159 3,164,015 1/1965 Schafer 73/159 3,316,760 5/1967 Ward 73/159 3,037,381 6/1962 Grant 73/159 Primary ExaminerJames W. Lawrence Assistant ExaminerD. C. Nelms Attorney-Howard P. West, Jr.
[57] ABSTRACT An apparatus for detecting irregularities, such as hard defects and varying tension, in a continuous web moving in a path includes a cylinder mounted for eccentric movement about an axis above and transverse to said web and a plate mounted for angular movement about the same axis. The lower edge of the plate is transverse to and engages the web and a guide positioned below the web and adjacent the cylinder directs the web into engagement with the outer surface of the cylinder. Means are provided to detect movement of the cylinder and the plate occasioned by irregularities in the web.
3 Claims, 3 Drawing Figures PATENTED BET 2 I975 FIG.I
DEFECT DETECTOR FOR A MOVING WEB BACKGROUND OF THE INVENTION This invention concerns apparatus for monitoring irregularities in moving continuous textile materials. More specifically, the apparatus of this invention detects, records and operates machine stop mechanisms 1 in response to occurrences of not only knots, or other hard defects, but also fiber entanglements, varying web tension and product discontinuities, such as runouts and partial or full breaks in a textile ribbon, rope or tow.
By textile ribbon, rope or tow as used in this specification is meant a nontwisted band of numerous parallel continuous filaments gathered together to be processed as an entity such as by drawing, heat treating, crimping and cutting to staple fibers or direct spinning into sliver or spun yarn. In many processing steps the multiple strand is transported in the form of a relatively flat or web-like form. When the strand is in this form, it is in condition for monitoring by the apparatus of this invention. For convenience, these types of materials will be called webs hereafter.
A wide variety of defect detectors for monitoring a moving web is disclosed in the art. Although each may be satisfactory for the detection of a specific type of defect, none provides a consolidated structure capable of simultaneously detecting physical defects in a web as well as undesirable changes in web tension. Formerly, in order to detect these several types of defects, it was necessary to employ more than one type of defect detector. In some processing steps, space limitations dic tate the need for a consolidated defect detector. The present invention fulfills this need.
SUMMARY OF THE INVENTION An apparatus for detecting irregularities in a continuous web moving in a path, said apparatus comprising a shaft positioned above and transverse to said path; a cylinder mounted for eccentric movement about said shaft, said cylinder having an outer surface engaging said web; a guide positioned below said path adjacent said cylinder for directing said web against said outer surface; a plate mounted for angular movement about said shaft, said plate having a lower edge transverse to and engaging said web; and means for detecting movement of said cylinder and said plate occasioned by irregularities in the moving web.
If necessary, the cylinder and plate may be biased against movement occasioned by the movement of the web along the path.
BRIEF DESCRIPTION OF THE DRAWINGS DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Turning first to FIG. 1, web is transported by a processing machine from a source not shown under a detector 11 is used in connection with a textile tow-tostaple cutter. A cylindrical guide 16 is mounted for eccentric movement about shaft 13. Guide 16 is hollow and has part of its wall cut out to receive a combined feeler plate and light shield member 20 whcih is also mounted for angular movement about shaft 13. Two guide motion limiters 30 are attached to shaft 13. These limiters are constructed and arranged to limit the angular movement of cylindrical guide 16 about shaft 13. A bolt 32 is threaded into element 30 and provided with a hook 34 to receive a spring 36 which is stretched and fastened to a second hook 38 fixed to cylindrical guide 16 at an appropriate location on its inner surface. A similar biasing arrangement may be associated with the second guide motion limiter at the other end of shaft 13. Similarly a spring biasing arrangement may be provided for plate member 20 if found necessary although in the preferred embodiment such a biasing mechanism is not needed and member 20 swings freely within limits. A light source and photoelectric receiver combination 40 is mounted centrally on the back member of bracket 14. A cable 42 extends from this combination to a power source and to alarm, recorder and machine drive stop mechanisms not shown.
A base plate assembly 44 is mounted below guide 16 and positioned so that tip 46 urges web 10 toward guide 16. Plate 44 is hinged about shaft 48 and is spring loaded by a mechanism not shown to bias plate 44 toward cylinder 16.
Turning now to FIGS. 2 and 3, the cylindrical guide is seen to comprise a hollow, cylindrical shell 17 cut away to provide an opening for plate member 20. Two webs l8, 19 are welded inside shell 17, perpendicular to its central axis, at symmetrical locations in from the ends of the shell. Two cylindrical bearing housings 211, 22 are welded respectively to webs l8, 19. The axes of these housings are parallel to but displaced from the central axis of the shell. A light reflecting spot 15 is provided on the outer surface of shell 17 approximately midway between the two ends of the shell above the opening. The integrated feeler plate and light shield 20 comprises a shaped plate 23, of length sufficient to approximately span the width of the web being monitored, welded to two frame plates 24, 25 on one sloped edge thereof. A pair cylindrical bearing housings 27, 28 are welded to the outboard surfaces of plates 24, 25, respectively. A light shield 26 of elongated, rectangular shape is mounted on another edge of frame plates 24, 25. Plates 24, 25 are shaped so that plate 23 and shield 26 are fixed at different positions approximately 30 apart around the axis of bearing housings 27, 28. The spacings of frame plates 24, 25 and bearings 27, 28 are arranged so that, when mounted on fixed shaft 13 along with guide 16, housings 27, 28 fit along shaft 13 between housings 21, 22. Bearing inserts of nylon or other low friction material are provided in housings 21, 22 and 27, 28.
Guide motion limiters 30 take the shape of solid partial cylinders. These limiters are mounted to shaft'13 inside guide 16 but outboard of bearing housings 21, 22.
In operation, the defect detector is mounted as shown in FIG. 1 with a guide 12 and companion guide not shown located to introduce the web to be monitored first in between base plate 44 and cylindrical guide 16, thence across feeler plate 23 and on to further processing apparatus such as a staple cutter. When a knot, entanglement or other hard defect arrives between plate 44 and guide 16, the latter will be forced up and away from its normal position in such a way that the light reflecting spot 15 will be moved out of line with the beam of light from light source 40. This causes an electrical impulse to be generated by the photoelectric detector. If the defect is unusually large, base plate 44 will also be moved against its spring loading and deflect about axis 48. This flexibility also facilitates the stringing up of the web at startup. At the same time, plate 23 rides on the top surface of the web. When the tension in the web decreases or when the web breaks or part of it runs out, plate 23 will fall downward thus causing angular movement of the member 20 about shaft 13. This brings shield 26 downward to mask reflecting spot 15. The resulting change in illumination on the photoelectric detector provides an electrical signal as before. These signals are used in operating alarms, a recorder, and/or shutting down the web transport machine. Likewise, if tension in the web increases due, for example, to the web tangling as it leaves the supply package, plate 23 or guide 16 will be moved in such a way that again a photoelectric signal will be provided to operate alarms, etc.
Thus, a novel means has been provided for monitoring a moving length of textile ribbon, rope or tow in order to detect and provide signals upon the occurrence of several kinds of defects by means of one consolidated defect detector. Hard defects, such as knots and tangles, can be detected. Increases or decreases in tension due either to a web break or a stoppage in the supply or a partial runout of the web structure can be monitored by the same apparatus. Thus, asingle detector is able to perform the function which in the past has required three or four monitoring instruments. This invention, therefore, yields not only improved convenience but also decreased cost. In some cases where space restricts the installation to one monitoring device, the present invention permits the monitoring of defects that could not previously be detected in such situations.
What is claimed is:
1. An apparatus for detecting irregularities in a continuous web moving in a path, said apparatus comprising a shaft positioned above and transverse to said path; a cylinder mounted for eccentric movement about said shaft, said cylinder having an outer surface engaging said web; a guide positioned below said path adjacent said cylinder for directing said web against said outer surface; a plate mounted for angular movement about said shaft, said plate having a lower edge transverse to and engaging said web; a light-photocell combination located in a fixed position relative to said cylinder and said plate, said combination illuminating a portion of said cylinder and detecting illumination of said cylinder, said illumination changing with relative movement of said cylinder and said plate occasioned by irregularities in the moving web.
2. The apparatus as defined in claim 1, including means for biasing said cylinder against movement occasioned by the movement of said web in said path.
3. The apparatus as defined in claim 2, including means for biasing said plate against movement occasioned by movement of said web in said path.

Claims (3)

1. An apparatus for detecting irregularities in a continuous web moving in a path, said apparatus comprising a shaft positioned above and transverse to said path; a cylinder mounted for eccentric movement about said shaft, said cylinder having an outer surface engaging said web; a guide positioned below said path adjacent said cylinder for directing said web against said outer surface; a plate mounted for angular movement about said shaft, said plate having a lower edge transverse to and engaging said web; a light-photocell combination located in a fixed position relative to said cylinder and said plate, said combination illuminating a portion of said cylinder and detecting illumination of said cylinder, said illumination changing with relative movement of said cylinder and said plate occasioned by irregularities in the moving web.
2. The apparatus as defined in claim 1, including means for biasing said cylinder against movement occasioned by the movement of said web in said path.
3. The apparatus as defined in claim 2, including means for biasing said plate against movement occasioned by movement of said web in said path.
US00234966A 1972-03-15 1972-03-15 Defect detector for a moving web Expired - Lifetime US3763373A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23496672A 1972-03-15 1972-03-15

Publications (1)

Publication Number Publication Date
US3763373A true US3763373A (en) 1973-10-02

Family

ID=22883504

Family Applications (1)

Application Number Title Priority Date Filing Date
US00234966A Expired - Lifetime US3763373A (en) 1972-03-15 1972-03-15 Defect detector for a moving web

Country Status (4)

Country Link
US (1) US3763373A (en)
CA (1) CA957699A (en)
GB (1) GB1386050A (en)
NL (1) NL7303571A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612842A (en) * 1985-08-14 1986-09-23 E. I. Du Pont De Nemours And Company Apparatus for cutting filamentary material
US6009421A (en) * 1994-02-15 1999-12-28 R. R. Donnelley & Sons Company Device and method for decreasing web breaks in a printing system based on web tension ratios
WO2008100135A1 (en) * 2007-02-13 2008-08-21 Jacob Hendrik Martin Berends Restrictor

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037381A (en) * 1959-05-13 1962-06-05 Warren S D Co Bump detector
US3164015A (en) * 1961-11-16 1965-01-05 Hans Biel Apparatus for detecting surface imperfections on moving webs, especially of paper
US3219829A (en) * 1961-03-30 1965-11-23 Ferag Fehr & Reist A G Photoelectric device for counting advancing overlapped flat articles
US3316760A (en) * 1964-11-09 1967-05-02 Teledyne Inc Seam detector
US3327398A (en) * 1963-05-30 1967-06-27 Canada Glazed Papers Ltd Sheet material inspection apparatus
US3334239A (en) * 1962-06-22 1967-08-01 Nash Paul Pivotal light-gate for detecting surface elevations in sheet materials
US3363107A (en) * 1964-12-07 1968-01-09 Du Pont Tow flaw apparatus wherein the flaw vibrates a pivoted element between a light source and photocell
US3363458A (en) * 1966-02-11 1968-01-16 Cutler Hammer Inc Apparatus for detecting surface imperfections on moving webs
US3666951A (en) * 1969-04-16 1972-05-30 Hell Rudolf Dr Ing Device for detecting defects in continuous web material

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3037381A (en) * 1959-05-13 1962-06-05 Warren S D Co Bump detector
US3219829A (en) * 1961-03-30 1965-11-23 Ferag Fehr & Reist A G Photoelectric device for counting advancing overlapped flat articles
US3164015A (en) * 1961-11-16 1965-01-05 Hans Biel Apparatus for detecting surface imperfections on moving webs, especially of paper
US3334239A (en) * 1962-06-22 1967-08-01 Nash Paul Pivotal light-gate for detecting surface elevations in sheet materials
US3327398A (en) * 1963-05-30 1967-06-27 Canada Glazed Papers Ltd Sheet material inspection apparatus
US3316760A (en) * 1964-11-09 1967-05-02 Teledyne Inc Seam detector
US3363107A (en) * 1964-12-07 1968-01-09 Du Pont Tow flaw apparatus wherein the flaw vibrates a pivoted element between a light source and photocell
US3363458A (en) * 1966-02-11 1968-01-16 Cutler Hammer Inc Apparatus for detecting surface imperfections on moving webs
US3666951A (en) * 1969-04-16 1972-05-30 Hell Rudolf Dr Ing Device for detecting defects in continuous web material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612842A (en) * 1985-08-14 1986-09-23 E. I. Du Pont De Nemours And Company Apparatus for cutting filamentary material
US6009421A (en) * 1994-02-15 1999-12-28 R. R. Donnelley & Sons Company Device and method for decreasing web breaks in a printing system based on web tension ratios
WO2008100135A1 (en) * 2007-02-13 2008-08-21 Jacob Hendrik Martin Berends Restrictor

Also Published As

Publication number Publication date
NL7303571A (en) 1973-09-18
GB1386050A (en) 1975-03-05
CA957699A (en) 1974-11-12

Similar Documents

Publication Publication Date Title
US4058962A (en) Method and apparatus for detecting periodic yarn irregularities in a yarn between a yarn forming stage and a yarn winding stage
US4084398A (en) Mobile servicing arrangement for open-end spinning machines
US4976018A (en) Device for monitoring threads on a textile machine
US4023341A (en) Device for detecting the breakage of yarn in drawing frames and spinning frames
US10000867B2 (en) Device and method for determining the diameter of a yarn balloon formed by a running yarn at a workstation of a textile machine
US3438188A (en) Yarn defect detecting device
US3430426A (en) Monitoring device for spinning frame
US5017797A (en) Device for detecting yarn
US3763373A (en) Defect detector for a moving web
US3514615A (en) Thread discontinuity and defect detection apparatus
US3447213A (en) Method and apparatus for detecting irregularities in a moving sheet of yarn
US5211709A (en) Stop motion device for strand processing machine
US3386145A (en) Quality monitoring system for continuously moving filamentary structures
GB1510358A (en) Surveying apparatus for textile machine
US3873043A (en) Yarn guide- and monitoring apparatus for a bobbin creel
JP2022526175A (en) Non-contact optical detection method of yarn, optical sensor of yarn and textile machine in the workstation of yarn manufacturing textile machine
US6543093B2 (en) Apparatus for detecting displacements and/or presence of sliver in a fiber processing machine
US3643883A (en) Lap-detecting stop motion
JP2001520971A (en) Winding detection device
US3618168A (en) Apparatus for detecting broken yarn in synthetic fiber spinning
GB1258009A (en)
US3262180A (en) Device for detecting yarn breakage
US3034278A (en) Tension control device for yarn winder
US3794252A (en) Detecting means for yarn processing apparatus
US4343144A (en) Control arrangement for a textile machine