EP1781851A1 - Monitoring device - Google Patents

Monitoring device

Info

Publication number
EP1781851A1
EP1781851A1 EP05774610A EP05774610A EP1781851A1 EP 1781851 A1 EP1781851 A1 EP 1781851A1 EP 05774610 A EP05774610 A EP 05774610A EP 05774610 A EP05774610 A EP 05774610A EP 1781851 A1 EP1781851 A1 EP 1781851A1
Authority
EP
European Patent Office
Prior art keywords
light
weft
reed
channel
slats
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.)
Withdrawn
Application number
EP05774610A
Other languages
German (de)
French (fr)
Inventor
Per Johansson
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.)
Eltex of Sweden AB
Original Assignee
Eltex of Sweden AB
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 Eltex of Sweden AB filed Critical Eltex of Sweden AB
Publication of EP1781851A1 publication Critical patent/EP1781851A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/3073—Detection means therefor
    • 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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention relates to a device according to the preamble to appended Claim 1.
  • the components are subjected to extremely severe loadings, since the reed or comb strikes more than 20 strokes per second and more in state of the art looms, which implies that the components in the arrival indicator are subjected to as severe loadings as 5OG and more in state of the art looms and the weft or filling moves at a speed of approx. 60 metres a second and faster in state of the art looms. These extreme forces and high speeds naturally place extremely high demands on the equipment involved.
  • the task forming the basis of the present invention is to satisfy the above-outlined wishes and needs by realising a considerably improved device for weft monitoring.
  • the present invention realises a device which displays considerably improved operational properties than prior art indicators. Above all, considerably more reliable operation will be achieved with such difficult threads as entail slight or no reflection of light, for example thin white nylon thread, or has the same reflection properties as the reed, for example loose dark grey thread. In particular, this latter thread has hitherto entailed considerable difficulties.
  • One of the major advantages inherent in a device according to the present invention is that the thus obtained signal is thus considerably less ambiguous and more exact in connection with different types of threads than has hitherto been possible using prior art devices.
  • Fig.l is a perspective view of a part of a reed with one embodiment of a device according to the present invention.
  • Fig. 2 shows a view similar to that of Fig. 1 of another embodiment of a device according to the present invention.
  • Fig. 3 is a side elevation of yet another embodiment of a device according to the present invention.
  • Fig 4 is a side elevation of yet a further embodiment of a device according to the present invention.
  • Fig. 5 is a side elevation of a part of the embodiments in Figs. 3 and 4.
  • the present invention will now be described in greater detail in connection with parts of a per se known loom which operates with a reed which includes a large number of mutually parallel slats 1.
  • Such looms or weaving machines are often designated Air-jet looms.
  • the slats 1 in the reed are parallel with one another and disposed in spaced apart relationship.
  • the reed strikes back and forth with approx. 20 strokes per second, which implies that the components are subjected to severe mechanical stresses of as much as 50G and more. These speeds and loadings may be expected to be even higher in the most modern and also in future looms.
  • the slats 1 are designed for the formation of a channel 2 through which the weft or the thread is blown with the air of compressed air at a speed of up to approx. 60 metres a second.
  • Prior art looms are often provided with two sensors or indicators of which the one indicates that the weft or the thread has reached a sufficient distance and the other indicates that the thread or weft has gone too far. If the weft has fastened, it will not arrive at the indicator and if the weft reaches the second indicator, there may be a thread or weft breakage. In both cases, the loom is stopped. The point in time when the weft reaches the indicator is used for regulating the air jet which blows in the weft, the thread or the yarn.
  • the embodiment of a device according to the present invention illustrated in Fig.l has a light source 4 for illuminating the weft or the thread or the yarn 3 in the channel 2 substantially from beneath.
  • the light source may be a laser light source for light of one wavelength, but may also be a combination of light sources for light at the same or different wavelengths.
  • the light source 4 emits light 4A into and through a space between the slats 1 in the reed and out into the channel 2.
  • a light sensor 5 is placed at a suitable position for sensing light substantially directly reflected from the weft 3.
  • the light source 4 and the sensor or detector 5 are connected to a box 6 housing electronics for regulating the light source 4 and evaluating the signal from the detector or the sensor 5.
  • the box 6 may also electronics for indicating the signal from the detector 5 and possibly for stopping the loom.
  • Fig.2 shows a further embodiment of a device according to the present invention.
  • the same components have been given the same reference numeral in the different figures.
  • the major difference between this embodiment and the embodiment illustrated in Fig. 1 is that the light source 4 emits a light beam 8 towards a mirror 7 or a prism 7 for refracting the beam 8 towards the weft 3 in the channel 2.Thus, the light beam 8 will pass through a space between the slats 1. There is naturally nothing to prevent the light beam 8 from passing through several spaces between the slats 1.
  • the light beam or beams 9 reflected from the weft 3 are sensed by means of the detector 5.
  • Fig. 3 shows yet a further embodiment of a device according to the present invention and substantially schematically illustrates the light beams 8 which depart from a light source 4 and extend through a light conductor 10 which is shown in greater detail in Fig. 5.
  • the light beams 8 are reflected on a mirror-coated surface 11 in the light conductor 10.
  • the light beams 8 depart from the light conductor 10 through a curved surface 12 and enter therein through a curved surface 13.
  • the light beams departing from the light conductor 10 pass through the spaces between the slats 1 and into the channel 2 where they are reflected by the weft 3 and the walls in the channel 2.
  • a line 14 is utilised to illustrate an arm on which the light source 4 is mounted, and possibly a sensor or detector 5 which may be disposed on the end of the line 14 which may be curved and extended up to and possibly past the weft 3.
  • Fig. 3 further illustrates the light beams that are reflected by the front edge of the slats 1 towards the arm 14.
  • Fig. 4 shows in principle the same embodiment as in Fig. 3, but with the light beams 9 reflected from the weft 3 which impinge on a curved mirror 15.
  • This curved mirror 15 gathers the light beams 9 and directs them towards the detector or sensor 5 which is placed on the arm 14 which is illustrated by means of a line.
  • the curved mirror 15 may also be a lens, a prism, a light conductor etc., or combinations thereof.
  • curved surfaces 15 focus the light beam. On evaluation, it has proved to be suitable to illuminate and detect light from at least a few millimetres of the weft or the thread.
  • detectors 5 By placing several detectors 5 in sequence after one another, it is possible to work with several detector channels that can afford advantages from the perspective of signal processing and which may comprise one or more light sources for light of the same or different wavelengths and one or more light sensors for cooperation each with one or more light sources. It may happen that a detector gives a false output signal because of dust, undesirable reflection or noise. With a plurality of channels, a more reliable assessment and evaluation can be created and attained if there is a weft or a thread in the channel.
  • spectral filters for improving the signal/noise relationship.
  • photo detectors with spectral filters There are photo detectors with spectral filters. It may also be appropriate to employ several different light wavelengths for improving the sensing of so-called difficult threads or yarns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Quality & Reliability (AREA)

Abstract

The present invention relates to a device for monitoring, preferably arrival monitoring, of a weft, for example a weft thread, in a loom of substantially the type in which the weft is driven through the shed with the aid of a jet, e.g. an air jet, and which has a reed which is built up from a number of vertically disposed slats with spacing and has a longitudinal channel for the weft, first means being provided at that position where it is desirable to monitor the weft with a view to transmitting light towards the channel in the reed for illuminating the weft with minimal reflection of light from the reed, and second means are provided at said position for detection of light substantially reflected from the weft.

Description

MONITORING DEVICE
The present invention relates to a device according to the preamble to appended Claim 1. There is a serious need in the art to improve prior art arrival indicators of the type disclosed above for attaining more sensitive and reliable operation with a considerably greater number of different types of threads. The problems inherent in prior art indicators are particularly manifest in connection with thin yarns, single threads, yarns or threads with reflection properties close to those of the background, and certain black threads. It is also desirable in the art to improve purely mechanical stability and mechanical strength for achieving a longer service life. The components are subjected to extremely severe loadings, since the reed or comb strikes more than 20 strokes per second and more in state of the art looms, which implies that the components in the arrival indicator are subjected to as severe loadings as 5OG and more in state of the art looms and the weft or filling moves at a speed of approx. 60 metres a second and faster in state of the art looms. These extreme forces and high speeds naturally place extremely high demands on the equipment involved.
The task forming the basis of the present invention is to satisfy the above-outlined wishes and needs by realising a considerably improved device for weft monitoring.
This task is solved according to the present invention in the device indicated by way of introduction in that it has been given the characterising features as set forth in appended Claim 1.
The present invention realises a device which displays considerably improved operational properties than prior art indicators. Above all, considerably more reliable operation will be achieved with such difficult threads as entail slight or no reflection of light, for example thin white nylon thread, or has the same reflection properties as the reed, for example loose dark grey thread. In particular, this latter thread has hitherto entailed considerable difficulties. One of the major advantages inherent in a device according to the present invention is that the thus obtained signal is thus considerably less ambiguous and more exact in connection with different types of threads than has hitherto been possible using prior art devices.
The present invention will now be described in greater detail hereinbelow, with reference to the accompanying drawings. Fig.l is a perspective view of a part of a reed with one embodiment of a device according to the present invention. Fig. 2 shows a view similar to that of Fig. 1 of another embodiment of a device according to the present invention. Fig. 3 is a side elevation of yet another embodiment of a device according to the present invention. Fig 4 is a side elevation of yet a further embodiment of a device according to the present invention. Fig. 5 is a side elevation of a part of the embodiments in Figs. 3 and 4.
The present invention will now be described in greater detail in connection with parts of a per se known loom which operates with a reed which includes a large number of mutually parallel slats 1. Such looms or weaving machines are often designated Air-jet looms. The slats 1 in the reed are parallel with one another and disposed in spaced apart relationship. There are reeds with larger and more spaced apart slats 1 and reeds with thinner and more closely packed slats 1. The reed strikes back and forth with approx. 20 strokes per second, which implies that the components are subjected to severe mechanical stresses of as much as 50G and more. These speeds and loadings may be expected to be even higher in the most modern and also in future looms.
The slats 1 are designed for the formation of a channel 2 through which the weft or the thread is blown with the air of compressed air at a speed of up to approx. 60 metres a second. Prior art looms are often provided with two sensors or indicators of which the one indicates that the weft or the thread has reached a sufficient distance and the other indicates that the thread or weft has gone too far. If the weft has fastened, it will not arrive at the indicator and if the weft reaches the second indicator, there may be a thread or weft breakage. In both cases, the loom is stopped. The point in time when the weft reaches the indicator is used for regulating the air jet which blows in the weft, the thread or the yarn.
The embodiment of a device according to the present invention illustrated in Fig.l has a light source 4 for illuminating the weft or the thread or the yarn 3 in the channel 2 substantially from beneath. The light source may be a laser light source for light of one wavelength, but may also be a combination of light sources for light at the same or different wavelengths. The light source 4 emits light 4A into and through a space between the slats 1 in the reed and out into the channel 2.A light sensor 5 is placed at a suitable position for sensing light substantially directly reflected from the weft 3. The light source 4 and the sensor or detector 5 are connected to a box 6 housing electronics for regulating the light source 4 and evaluating the signal from the detector or the sensor 5. The box 6 may also electronics for indicating the signal from the detector 5 and possibly for stopping the loom.
Fig.2 shows a further embodiment of a device according to the present invention. The same components have been given the same reference numeral in the different figures. The major difference between this embodiment and the embodiment illustrated in Fig. 1 is that the light source 4 emits a light beam 8 towards a mirror 7 or a prism 7 for refracting the beam 8 towards the weft 3 in the channel 2.Thus, the light beam 8 will pass through a space between the slats 1. There is naturally nothing to prevent the light beam 8 from passing through several spaces between the slats 1. The light beam or beams 9 reflected from the weft 3 are sensed by means of the detector 5.
Fig. 3 shows yet a further embodiment of a device according to the present invention and substantially schematically illustrates the light beams 8 which depart from a light source 4 and extend through a light conductor 10 which is shown in greater detail in Fig. 5. The light beams 8 are reflected on a mirror-coated surface 11 in the light conductor 10. The light beams 8 depart from the light conductor 10 through a curved surface 12 and enter therein through a curved surface 13. The light beams departing from the light conductor 10 pass through the spaces between the slats 1 and into the channel 2 where they are reflected by the weft 3 and the walls in the channel 2. A line 14 is utilised to illustrate an arm on which the light source 4 is mounted, and possibly a sensor or detector 5 which may be disposed on the end of the line 14 which may be curved and extended up to and possibly past the weft 3. Fig. 3 further illustrates the light beams that are reflected by the front edge of the slats 1 towards the arm 14.
Fig. 4 shows in principle the same embodiment as in Fig. 3, but with the light beams 9 reflected from the weft 3 which impinge on a curved mirror 15. This curved mirror 15 gathers the light beams 9 and directs them towards the detector or sensor 5 which is placed on the arm 14 which is illustrated by means of a line. The curved mirror 15 may also be a lens, a prism, a light conductor etc., or combinations thereof.
It is known in the art that curved surfaces 15 focus the light beam. On evaluation, it has proved to be suitable to illuminate and detect light from at least a few millimetres of the weft or the thread. By placing several detectors 5 in sequence after one another, it is possible to work with several detector channels that can afford advantages from the perspective of signal processing and which may comprise one or more light sources for light of the same or different wavelengths and one or more light sensors for cooperation each with one or more light sources. It may happen that a detector gives a false output signal because of dust, undesirable reflection or noise. With a plurality of channels, a more reliable assessment and evaluation can be created and attained if there is a weft or a thread in the channel.
It may be advantageous to employ spectral filters for improving the signal/noise relationship. There are photo detectors with spectral filters. It may also be appropriate to employ several different light wavelengths for improving the sensing of so-called difficult threads or yarns.

Claims

CLAIMS υ
1. A device for monitoring, preferably arrival monitoring, of a weft, for example a weft thread, in a loom of substantially the type in which the weft is driven through the shed with the aid of a jet, e.g. an air jet, and which has a reed which is built up from a number of vertically disposed slats with spacing and has a longitudinal channel for the weft, characterised in that first means are provided at that position where it is desirable to monitor the weft with a view to transmitting light from beneath in the longitudinal direction of and between the slats in the reed towards the channel in the reed for illuminating the weft with minimal reflection of light from the reed, and that second means are provided at said position for detection of light substantially reflected from the weft.
2. The device as claimed in Claim 1, characterised in that said first means comprise a light source which is directed for the illumination of the weft in the channel through the space between the slats in the reed and substan
3. The device as claimed in Claim 2, characterised in that the light source is located on the same side of the reed as the channel therein.
4. The device as claimed in Claim 1, characterised in that said second means substantially comprise a light sensor which is provided for receiving light substantially reflected from the weft.
5. The device as claimed in Claim 1, characterised in that said first means comprise a light source and a light-refractive device which are coordinated to transmit light between the slats towards the channel and the weft therein.
6. The device as claimed in Claim 1, characterised in that said first means comprise a light source and a light conductor partly for substantial angular refraction of the light and partly for gathering the refracted light and directing same towards the channel and the weft through the space between the slats.
7. The device as claimed in Claim 6, characterised in that the light conductor displays a mirror surface and curved surfaces at input and output.
8. The device as claimed in any of Claims 1 to 6, characterised in that the light source and the light sensor are located in the same position.
9. The device as claimed in Claim 1, characterised in that said first means comprise one or more light sources for light of the same or different wavelengths for cooperation with one or more light sensors. 0. The device as claimed in Claim 1, characterised in that said second means comprise one or more light sensors for cooperation with one or more light sources for light of the same or several wavelengths.
EP05774610A 2004-08-24 2005-08-22 Monitoring device Withdrawn EP1781851A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0402063A SE528931C2 (en) 2004-08-24 2004-08-24 Monitoring device
PCT/SE2005/001226 WO2006022582A1 (en) 2004-08-24 2005-08-22 Monitoring device

Publications (1)

Publication Number Publication Date
EP1781851A1 true EP1781851A1 (en) 2007-05-09

Family

ID=33029171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05774610A Withdrawn EP1781851A1 (en) 2004-08-24 2005-08-22 Monitoring device

Country Status (5)

Country Link
EP (1) EP1781851A1 (en)
JP (1) JP2008510899A (en)
CN (1) CN101001987A (en)
SE (1) SE528931C2 (en)
WO (1) WO2006022582A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102346251A (en) * 2011-11-01 2012-02-08 江苏万工科技集团有限公司 Weft yarn floatation characteristic measurement device
JP5953911B2 (en) * 2012-04-27 2016-07-20 村田機械株式会社 Yarn monitoring device and yarn winding machine provided with the same
JP6190250B2 (en) * 2013-11-14 2017-08-30 株式会社豊田自動織機 Weft detection device for air jet loom
JP5999136B2 (en) * 2014-05-13 2016-09-28 株式会社豊田自動織機 Weft detection device in air jet loom
JP6384453B2 (en) * 2015-11-03 2018-09-05 株式会社豊田自動織機 Weft detection method in air jet loom
JP7099329B2 (en) * 2019-01-07 2022-07-12 株式会社豊田自動織機 Warp and weft detector for air jet looms
JP7226118B2 (en) * 2019-06-13 2023-02-21 株式会社豊田自動織機 Weft detection device for loom

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7206368A (en) * 1972-05-10 1973-11-13
JPS52155262A (en) * 1976-06-17 1977-12-23 Nissan Motor Woof detector
EP0204093B1 (en) * 1985-04-05 1989-08-02 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho A method and an apparatus for detecting the weft yarn in a jet loom
SE469597B (en) * 1991-09-23 1993-08-02 Rydborn S A O DEVICE FOR MONITORING THE IMAGE IN A WEAVING CHAIR, INCLUDING DIRECTLY LIGHT SENSITIVE ELEMENTS
BE1010779A3 (en) * 1996-12-02 1999-01-05 Picanol N V Naamloze Vennoosch WOOF WACHTER for a weaving machine.
SE510657C2 (en) * 1997-11-24 1999-06-14 Eltex Sweden Ab Monitoring device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006022582A1 *

Also Published As

Publication number Publication date
SE0402063L (en) 2006-02-25
SE0402063D0 (en) 2004-08-24
CN101001987A (en) 2007-07-18
WO2006022582A1 (en) 2006-03-02
JP2008510899A (en) 2008-04-10
SE528931C2 (en) 2007-03-20

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