EP0265081B1 - Dispositif pour palper la position latérale - Google Patents

Dispositif pour palper la position latérale Download PDF

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Publication number
EP0265081B1
EP0265081B1 EP19870308351 EP87308351A EP0265081B1 EP 0265081 B1 EP0265081 B1 EP 0265081B1 EP 19870308351 EP19870308351 EP 19870308351 EP 87308351 A EP87308351 A EP 87308351A EP 0265081 B1 EP0265081 B1 EP 0265081B1
Authority
EP
European Patent Office
Prior art keywords
edge
web
light
sensing
illumination
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
EP19870308351
Other languages
German (de)
English (en)
Other versions
EP0265081A1 (fr
Inventor
Jeffrey Isherwood
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.)
Harland Crosfield Ltd
Original Assignee
Harland Crosfield Ltd
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 Harland Crosfield Ltd filed Critical Harland Crosfield Ltd
Publication of EP0265081A1 publication Critical patent/EP0265081A1/fr
Application granted granted Critical
Publication of EP0265081B1 publication Critical patent/EP0265081B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/0204—Sensing transverse register of web
    • B65H23/0216—Sensing transverse register of web with an element utilising photoelectric effect

Definitions

  • Conventional devices for sensing the lateral position of a moving web of material include a transmitter located on one side of the web for transmitting a beam of radiation normal to the plane of the web and a receiver on the other side of the web.
  • the lateral edge of the web obscures part of the radiation transmitted from the transmitter to the receiver and thus, the amount of radiation received by the receiver provides an indication of the lateral position of the edge of the moving web of material.
  • the radiation may be ultrasonic energy or light and pneumatically operated devices have also been provided in which the lateral edge of the web interferes with air jets.
  • a device for sensing the lateral position of the edge of a longitudinally moving web comprises a source of light directed laterally onto the edge of the web, at least one edge of the light from the source being directed non-normally to the edge of the web substantially in the plane of the web so that the location of the said edge of the illumination on the edge of the web is dependent upon the distance of the edge of the web from the source and hence upon the lateral position of the edge of the web, and means for sensing and producing a signal which is dependent upon the location of the said edge of the illumination on the edge of the web, the signal indicating the lateral position of the edge of the web.
  • the source of light may emit a single generally parallel sided beam of light. In this case, it is the location of the edge of the illumination on the edge of the web in the direction of movement of the web which is indicative of the lateral position of the web.
  • the device is used to provide an indication of a change in the position of the edge of the moving web by the means for sensing and producing a signal comparing the location of the said edge at one instant with its location at a previous instant to detect movement of the edge of the web from its initial position.
  • the source of light may emit a single converging or diverging beam to illuminate the entire region of the edge of the web falling within the converging or diverging beam. In this case it may be the length of the illuminated region of the edge of the web which is sensed by the means for sensing and which gives an indication of the lateral position of the web.
  • the source of light may provide two generally parallel beams of light the axes of which converge or diverge. In this case two separate regions of the edge of the web are illuminated and it is the separation of these two regions which is sensed by the means for sensing and which gives an indication of the lateral position of the web.
  • the device for sensing forms part of an apparatus for controlling the lateral position of a moving web of material and, in this case, the apparatus also includes adjusting means for adjusting the transverse position of the moving web the adjusting means being responsive to the signal produced by the means for sensing to maintain the lateral position of the edge of the web constant.
  • the means for sensing and producing a signal which is dependent upon the location of the said edge of illumination or the separation of the edges of the illumination on the edge of the web may include a photodetector surrounded by a rotatable slit, means to monitor the angular position of the rotatable slit and means to correlate the monitored angular position of the rotatable slit with the reception of light by the photodetector to produce the signal.
  • the means for sensing preferably includes a corresponding number of photodetectors arranged one above the other in a direction generally perpendicular to the planes of the webs with the detectors located adjacent their corresponding webs.
  • the means for sensing may comprise a video camera focussed onto the lateral edge of the moving web of material together with means to monitor and analyse the video output of the camera to produce a signal dependent upon the location of the said edge of illumination or the separation of the regions of illumination on the edge of the moving web of material.
  • the preferred target of the video camera is a charge coupled device matrix since the output of this matrix can readily be processed to produce a digital output corresponding to the location of the said edge or the separation of the edges of the illumination on the edge of the web.
  • a video camera is used as the means for sensing it is especially useful when the device is arranged to handle a number of different webs.
  • the video output of the camera readily provides the information of the separation of the edges of the illumination on the edges of the number of different webs irrespective of the exact position of the lateral edges of the moving webs in a direction normal to the planes containing them.
  • a single diverging light source 1 is located adjacent the lateral edge of a moving web 2.
  • a diverging light beam is emitted from the source 1 in a direction generally parallel to the plane containing the web 2 as shown in Figure 1.
  • the length L of the lateral edge 3 of the web 2 which is illuminated by the diverging light beam from the source 1 is dependent upon the separation X of the lateral edge 3 and the light source 1. The further the lateral edge 3 moves away from the light source 1 the greater the illuminated length of the lateral edge 3.
  • two separate light sources 4 and 5 each of which emits a parallel beam of light are arranged with the axes of their parallel beams converging towards the lateral edge 3 of the moving web 2.
  • the parallel beams from the sources 4 and 5 each illuminate a separate small region of the edge 3 of the moving web 2.
  • the separation L of the illuminated regions is again dependent upon the separation X between the sources 4 and 5 and the lateral edge 3 of the moving web 2.
  • the beams from the sources 4 and 5 are converging L is inversely proportional to X.
  • Figure 4 shows the remainder of the first example and shows a detector 4 sensing the illuminated length of the edge 3 of the moving web 2.
  • the sensor includes a photodetector 6 surrounded by a rotating cylinder 7 including a slit 8.
  • Light scattered from the edge 3 is only received by the photodetector 6 when the rotating slit 8 is in a direct line between part of the illuminated edge 3 and the photodetector 6.
  • the detector 6 only receives light whilst the slit 8 is in the segment Q shown in Figure 4.
  • the angular extent of the segment Q provides an indication of the length L.
  • the rotating cylinder 7 is linked to an angular positioning encoder (not shown) which outputs a series of pulses.
  • the series of pulses are linked with the output of photodetector 6 in an AND gate.
  • the output of the AND gate is then fed to a counter.
  • the counter is incremented by the output pulses of the angular positioning encoder attached to the rotating cylinder 7.
  • the count accumulated in the count provides a signal which is proportional to L.
  • the count accumulated in the counter is compared in a comparator with a preset reference corresponding to the required position of the edge 3 of the moving web. if the count is greater than the reference the adjuster moves the web closer to the light source 1 and the count is less than the reference it moves it further away from the light source 1. If the count is the same as the reference it maintains the portion of the web constant.
  • Figure 5 shows the same detector that is used in the first example applied to the second example.
  • the output of the photodetector 6 is as shown in Figure 6.
  • the cylinder 7 rotates at a constant velocity the separation in time t at which the photodetector 6 receives pulses of light gives an indication of L
  • the separation of two illuminated regions of the edge of the sheet 2 which, in turn, gives an indication of the separation X of the lateral edge 3 from the light sources 4 and 5.
  • the time T shown in Figure 6 is the time for one complete revolution of the cylinder 7.
  • the time t between the receipt of the light from the two separated regions can again be used to control means to adjust the lateral position of the edge 3 of the web 2.
  • Figure 7 shows an alternative form of detector which can be used in either example but which, in Figure 7, is shown as being used with the second example.
  • the detector is formed by a video camera 9 including a lens assembly 10 and a target 11.
  • the lens 10 focusses an image of the edge 3 of the moving web 2 onto the target 11 which is preferably formed by a charge coupled device matrix.
  • the image formed on the target 11 either has the form of an illuminated line when used with the first example or two separated spots of light when used with the second example.
  • the length of the illuminated line or the separation of the two spots provides the indication of the distance L which, in turn, provides an indication of the separation X between the edge 3 of the moving web 2 and the light source 1 or 4 and 5.
  • the video output of the camera 9 is processed in a video frame store (not shown) to provide this information.
  • the X and Y co-ordinates of the image intensity are read from the digital input/output port of the video frame store to calculate the separation of the edges of the illuminated region of the web edge.
  • the variation in the Y-coordinate is a function of the variation of the lateral position of the web. With multiple webs the X-coordinate determines the web to which the measurement applies.
  • Figure 8 illustrates a configuration as shown in Figure 7 but with multiple webs 12, 13, 14, and 15.
  • Light from the source 4 is indicated diagramatically in Figures 8 and 9 by a x and light from the source 5 is indicated diagramatically in Figures 8 and 9 with a O.
  • the image formed on the target 11 of the video camera 9 is shown in Figure 9 and, as can be seen, the separation of the spots formed by the beams and the sources 4 and 5 provides an immediate indication of the lateral position of their edges 3.
  • Figure 10 illustrates a similar detector to that shown in Figures 4 and 5, and a light source 16 which produces a generally parallel beam of light which is non-normal to the edge 3 of the web 2.
  • a light source 16 which produces a generally parallel beam of light which is non-normal to the edge 3 of the web 2.
  • the rotating slit 8 and photodetector 6 detect the angular location of the illuminated region by comparing coincidence of an output from the photodetector 6 with the output of the shaft encoder 17.
  • the variation in the lateral position of the web edge is calculated by measuring the variation of the signal position relative to the shaft encoder 17 driven synchronously with the rotating slit 8.
  • the encoder position at which the signal occurs is stored in a memory (not shown). Any movement in the lateral position produces a signal at a different angular position of the slit 8.
  • the difference between the stored position and the present position is therefore a function of the change of position of the web edge. This is illustrated in Figure 11.

Claims (9)

  1. Dispositif de détection de la position latérale du bord d'une bande (2) se déplaçant longitudinalement, comprenant une source (1, 4, 5, 16) de lumière dirigée latéralement sur le bord de la bande (2), au moins un bord de la lumière de la source (1, 4, 5, 16) étant dirigé non perpendiculairement au bord de la bande et sensiblement dans le plan de la bande, de sorte que l'emplacement dudit bord de l'éclairage sur le bord de la bande (2) dépende de la distance entre le bord de la bande (2) et la source (1, 4, 5, 16) et donc de la position latérale du bord de la bande (2), et un moyen (6, 7, 8, 9) de détection produisant un signal qui dépend de la position dudit bord de l'éclairage sur le bord de la bande (2), le signal indiquant la position latérale du bord de la bande (2).
  2. Dispositif selon la revendication 1, où la source de lumière (16) émet un seul faisceau de lumière dont les côtés sont généralement parallèles et où le moyen (6, 7, 8) détecte l'emplacement du bord de l'éclairage sur le bord de la bande (2) dans la direction du mouvement de la bande (2).
  3. Dispositif selon la revendication 2, où une indication d'un changement de la position du bord de la bande en mouvement (2) est fournie par le moyen (6, 7, 8) de détection produisant un signal comparant l'emplacement dudit bord à un instant avec son emplacement à un instant antérieur, pour détecter le mouvement du bord de la bande.
  4. Dispositif selon la revendication 1, où la source de lumière (1) émet un seul faisceau convergent ou divergent pour éclairer toute la région du bord de la bande (2) se situant à l'intérieur du faisceau convergent ou divergent, et où le moyen (6, 7, 8, 9) détecte la longueur de la région éclairée pour donner une indication sur la position latérale de la bande.
  5. Dispositif selon la revendication 1, où la source de lumière (4, 5) émet deux faisceaux de lumière dont les côtés sont généralement parallèles et dont les axes convergent ou divergent pour éclairer deux régions séparées dans l'espace du bord de la bande, et où le moyen (6, 7, 8, 9) détecte l'espacement des deux régions séparées du bord de la bande pour fournir une indication concernant la position latérale de la bande.
  6. Dispositif selon l'une quelconque des revendications précédentes, où le dispositif de détection fait partie d'un appareil pour contrôler la position latérale d'une bande d'un matériau en mouvement (2) et où l'appareil comporte également un moyen d'ajustement pour ajuster la position transversale de la bande en mouvement (2), le moyen d'ajustement étant commandé par le signal produit par le moyen de détection, afin de maintenir constante la position latérale du bord de la bande.
  7. Dispositif selon l'une quelconque des revendications précédentes, où le moyen (6, 7, 8) de détection produisant un signal qui dépend de l'emplacement dudit bord d'éclairage ou de l'espacement des régions d'éclairage sur le bord de la bande comporte un photodétecteur (6) entouré d'un fente tournante (8), un moyen (17) pour suivre la position angulaire de la fente tournante et un moyen pour faire correspondre la position angulaire observée de la fente tournante avec la réception de lumière par le photodétecteur pour produire le signal.
  8. Dispositif selon l'une quelconque des revendications 1 à 6, où le moyen de détection comprend une caméra vidéo (9) avec mise au point sur le bord latéral de la bande de matériau en mouvement (2), en combinaison avec un moyen pour suivre et analyser la sortie de la caméra afin de produire un signal qui dépend de l'emplacement dudit bord d'éclairage ou de l'espacement des régions d'éclairage sur le bord de la bande (2) de matériau en mouvement.
  9. Dispositif selon l'une quelconque des revendications 1 à 7, qui fonctionne pour détecter la position d'une pluralité de bandes (2), le moyen de détection comprenant une pluralité de photodétecteurs (6) agencés l'un au-dessus de l'autre dans une direction générale perpendiculaire au plan des bandes (2), chaque photodétecteur (6) étant sensiblement adjacent à une bande correspondante.
EP19870308351 1986-09-24 1987-09-21 Dispositif pour palper la position latérale Expired - Lifetime EP0265081B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB868622972A GB8622972D0 (en) 1986-09-24 1986-09-24 Sensing device
GB8622972 1986-09-24

Publications (2)

Publication Number Publication Date
EP0265081A1 EP0265081A1 (fr) 1988-04-27
EP0265081B1 true EP0265081B1 (fr) 1991-12-11

Family

ID=10604710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870308351 Expired - Lifetime EP0265081B1 (fr) 1986-09-24 1987-09-21 Dispositif pour palper la position latérale

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EP (1) EP0265081B1 (fr)
JP (1) JP2588904B2 (fr)
DE (1) DE3775167D1 (fr)
GB (1) GB8622972D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008028532A1 (de) 2007-06-21 2008-12-24 Heidelberger Druckmaschinen Ag Vorrichtung zum Erfassen einer Kante eines flachen Bedruckstoffes

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8919371D0 (en) * 1989-08-25 1989-10-11 Thames Case Ltd Laminate production
EP0685761A1 (fr) * 1994-05-31 1995-12-06 Eastman Kodak Company Guidage précis du centrage d'une bande revêtue d'une émulsion photographique sensible à la lumière
JP3524888B2 (ja) * 2001-05-30 2004-05-10 三菱重工業株式会社 監視装置
CN108569582B (zh) * 2017-03-13 2021-12-14 深圳迅泰德自动化科技有限公司 隔膜供料设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5315018A (en) * 1976-07-27 1978-02-10 Ricoh Co Ltd Shunting device for recording needle
US4157477A (en) * 1977-10-11 1979-06-05 North American Mfg. Co. Light detector particularly adapted for detecting the position of edges of moving strip
JPS5679903A (en) * 1979-12-04 1981-06-30 Toshiba Corp Size measuring apparatus
JPS6079109U (ja) * 1983-11-08 1985-06-01 オムロン株式会社 距離測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008028532A1 (de) 2007-06-21 2008-12-24 Heidelberger Druckmaschinen Ag Vorrichtung zum Erfassen einer Kante eines flachen Bedruckstoffes

Also Published As

Publication number Publication date
JPS63147758A (ja) 1988-06-20
GB8622972D0 (en) 1986-10-29
DE3775167D1 (de) 1992-01-23
JP2588904B2 (ja) 1997-03-12
EP0265081A1 (fr) 1988-04-27

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