US3501642A - Device for monitoring the planar displacement of a continuous web - Google Patents

Device for monitoring the planar displacement of a continuous web Download PDF

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Publication number
US3501642A
US3501642A US559905A US3501642DA US3501642A US 3501642 A US3501642 A US 3501642A US 559905 A US559905 A US 559905A US 3501642D A US3501642D A US 3501642DA US 3501642 A US3501642 A US 3501642A
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web
edge
receiving means
monitoring
continuous web
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US559905A
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Curt Ake Gustav Wastesson
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Bonnierforetagen AB
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Bonnierforetagen AB
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/342—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells the sensed object being the obturating part

Definitions

  • the invention provides a device for sensing the planar displacement of a continuous web comprising in combination at least two beam-emitting means and a corresponding number of beam-receiving means located adjacent one edge of said web, each of said beam-receiving means being positioned to receive signals along a straight line path from the corresponding beam-emitting means, each of said beam-emitting means and the corresponding beam-receiving means being positioned on opposite sides of the main plane of said web and also on opposite sides of a plane coinciding with one edge of said Web and being at right angles to said main plane, whereby a predetermined upward movement of said web causes only one of said beam-receiving means to receive a beam, and a predetermined downward movement of said web causes the other of said beam-receiving means to receive a beam.
  • the device may be adjusted to also sense the continuity of the web by positioning the corresponding beam-emitting means and beam-re
  • the present invention relates to a device for sensing a web such as a paper web by means of an emitter such as a light or ultrasonic source and a detector (receiver) which is provided to receive signals from the emitter along the connecting line between the emitter and the detector.
  • a detector receiver
  • said connecting line extends at right angles to the web and is located inside of the one side edge of the web. The web will thus shield-off the signals to the detector until the web breaks.
  • a disadvantage of the known sensing device is that there is no indication of the height position of the web which may be of interest in order to determine the strain in the web and in order to indicate any possible fluttering of the web.
  • the object of the present invention is to provide a device of the kind under consideration which will sense breakage of the Web and also the height position of the web Within a greater or smaller range. This will be obtained by means of a device which according to the invention has the features indicated in the annexed claims.
  • the operative signal beam will thus be obliquely directed towards the surface of the web and may be so disposed that the beam will hit the detector when the side edge of the web has been moved upwardly beyond a predetermined position or downwardly below a predetermined position, respectively.
  • two de- Vices according to the invention are employed in combination with each other, one of said devices being provided to create a signal when the edge of the web is passing below a predetermined lower limit position whereas the other device is provided to create a signal when the web passes upwardly beyond a predetermined upper limit position.
  • the two beams Seen in the direction of movement of the web the two beams will cross each other and the edge of the web 3,501,642 Patented Mar. 17, 1970 will be able to move up and down in a range between the beams.
  • the distance of the edge of the Web from the crossing point of the beams there will be obtained a greater or smaller range between the beams for moving the side edge of the web in a vertical direction.
  • the device according to the invention By means of the device according to the invention it will be possible to immediately observe an undue slackening of the web at a certain position along the web which slackening normally proceeds a breakage at another position of the web.
  • the driving means of the web may accordingly be stopped upon breakage or before due to the fact that the impulses from the detector or the detectors are so coupled that they at a predetermined reduced strain in the web and a slackening resulted therefrom will stop the driving means of the web.
  • the web will be subjected to vibration or violent oscillation and these will also be sensed by means of the device according to the invention.
  • a device according to the invention is placed at each side of the web.
  • FIG. 1 shows diagrammatically a device according to the invention having two emitters and two detectors, the device being seen in the direction of movement of the web
  • FIG. 2 is a view from above of the device in FIG. 1
  • FIG. 3 is a diagrammatic perspective view of the device in FIGS. 1 and 2.
  • Reference numeral 1 denotes a paper web which, furthermore, is shown in two positions 1a and 1b indicated by dotted lines.
  • the position 1a indicates an upper limit position and the position 1b indicates a lower limit position.
  • a coupling box 3 which on its side facing the web is provided with two shielding-off devices in the form of two parallel pipes 4 and 5 which are located at different heights and are displaced relative each other in the longitudinal direction of the web.
  • the pipes 4, 5 are provided with small slit-shaped openings 6, 7 on their sides facing the web.
  • lamps 8, 9 which form light sources to throw a light beam 10 and 11, respectively, into the openings 7 and 6, respectively, the wall of the pipe around the opening being provided to shield-off any other light from the lamps.
  • the detector located within the pipe which may be in the form of photo cells 12 and 13, respectively.
  • the light sources 8, 9 it is possible to use an ultrasonic emitter, and corresponding detectors 12, 13 would in this case merely receive signals along the lines 10, 11.
  • the side edge 2 of the web will extend into the path of signal lines 10, 11 so that the signals to the detectors 12, 13 are shielded-off by the edge portion of the web. Since the device of FIG. 1 is symmetrically constructed seen in the longitudinal direction of the web the lines 10, 11 will cross each other in a point 14. The web 1 will'pass through this point 14 in its intermediate position and will extend somewhat beyond this point. Depending on the distance of the side edge 2 from the point 14 the side edge may be moved upwardly or downwardly within a greater or lesser range before the edge passes the one or the other of the lines 10, 11. If the edge 2 is positioned further inwardly toward coupling box 3, that is at a greater distance from the point 14, it may move upwardly and downwardly within a greater range between the lines 10, 11 before any signal will reach the detectors 12, 13.
  • the device will also sense displacements in a transverse direction of the edge 2.
  • two devices of the kind shown in FIG. 1 are employed and are placed at each side edge of the web 1. Accordingly, there will also be obtained a very accurate control of the movement of the web in a transverse direction.
  • a plurality of devices according to the invention may be placed along the length of the web so that on a central control desk it will be possible to observe any changes of the web at predetermined places between the various stations for the treatment of the web.
  • the device shown is primarily intended for paper webs for printing of newspapers but Webs of any other material may advantageously be controlled by means of the sensing device according to the invention.
  • a device for sensing the planar displacement of a continuous web comprising in combination at least two beam-emitting means and a, corresponding number of beam-receiving means located adjacent one edge of said web,
  • each of said beam-receiving means being being positioned to receive signals along a straight line path from the corresponding beam-emitting means, each of said beam-emitting means and the corresponding beam-receiving means being positioned on opposite sides of the main plane of said web and also on opposite sides of a plane coinciding with one edge of said web and being at right angles to said main plane,
  • each of said beam-emitting means and the coresponding beam-receiving means are positioned so that the straight line connecting each of said corresponding emitting and receiving means passes through the continuous web whereby neither of said beamreceiving means receives a beam while the web is continuous and while it does not have upward or downward movement above or below said predetermined upward or downward movement.
  • each of said beamreceiving means extends from a holder which also contains said beam-emitting means and which provides adjustable positioning of said means.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Paper (AREA)

Description

Ma 1970 c. AKE G. WASTESSON 0 DEVICE FOR MONITORING THE PLANAR DISPLACEMENT OF A CONTINUOUS WEB Filed June 23, 1966 IN V EN TOR. C an? A Kc Gusmv Wastes son qua mummy.
MAW
United States Patent US. Cl. 250219 6 Claims ABSTRACT OF THE DISCLOSURE The invention provides a device for sensing the planar displacement of a continuous web comprising in combination at least two beam-emitting means and a corresponding number of beam-receiving means located adjacent one edge of said web, each of said beam-receiving means being positioned to receive signals along a straight line path from the corresponding beam-emitting means, each of said beam-emitting means and the corresponding beam-receiving means being positioned on opposite sides of the main plane of said web and also on opposite sides of a plane coinciding with one edge of said Web and being at right angles to said main plane, whereby a predetermined upward movement of said web causes only one of said beam-receiving means to receive a beam, and a predetermined downward movement of said web causes the other of said beam-receiving means to receive a beam. The device may be adjusted to also sense the continuity of the web by positioning the corresponding beam-emitting means and beam-receiving means so that the straight line connecting each of said corresponding emitting and receiving means passes through the web when it is in its usual planar position.
The present invention relates to a device for sensing a web such as a paper web by means of an emitter such as a light or ultrasonic source and a detector (receiver) which is provided to receive signals from the emitter along the connecting line between the emitter and the detector. In known devices of the kind under consideration said connecting line extends at right angles to the web and is located inside of the one side edge of the web. The web will thus shield-off the signals to the detector until the web breaks.
A disadvantage of the known sensing device is that there is no indication of the height position of the web which may be of interest in order to determine the strain in the web and in order to indicate any possible fluttering of the web.
The object of the present invention is to provide a device of the kind under consideration which will sense breakage of the Web and also the height position of the web Within a greater or smaller range. This will be obtained by means of a device which according to the invention has the features indicated in the annexed claims. According to the invention the operative signal beam will thus be obliquely directed towards the surface of the web and may be so disposed that the beam will hit the detector when the side edge of the web has been moved upwardly beyond a predetermined position or downwardly below a predetermined position, respectively. Preferably, two de- Vices according to the invention are employed in combination with each other, one of said devices being provided to create a signal when the edge of the web is passing below a predetermined lower limit position whereas the other device is provided to create a signal when the web passes upwardly beyond a predetermined upper limit position. Seen in the direction of movement of the web the two beams will cross each other and the edge of the web 3,501,642 Patented Mar. 17, 1970 will be able to move up and down in a range between the beams. Depending on the distance of the edge of the Web from the crossing point of the beams there will be obtained a greater or smaller range between the beams for moving the side edge of the web in a vertical direction. By means of the device according to the invention it will be possible to immediately observe an undue slackening of the web at a certain position along the web which slackening normally proceeds a breakage at another position of the web. The driving means of the web may accordingly be stopped upon breakage or before due to the fact that the impulses from the detector or the detectors are so coupled that they at a predetermined reduced strain in the web and a slackening resulted therefrom will stop the driving means of the web. In certain cases the web will be subjected to vibration or violent oscillation and these will also be sensed by means of the device according to the invention. Furthermore, there is obtained a certain control of the position of the web in the transverse direction. Preferably, a device according to the invention is placed at each side of the web.
A preferred embodiment of the invention is shown by way of example in the annexed drawing.
FIG. 1 shows diagrammatically a device according to the invention having two emitters and two detectors, the device being seen in the direction of movement of the web, FIG. 2 is a view from above of the device in FIG. 1, and FIG. 3 is a diagrammatic perspective view of the device in FIGS. 1 and 2.
Reference numeral 1 denotes a paper web which, furthermore, is shown in two positions 1a and 1b indicated by dotted lines. The position 1a indicates an upper limit position and the position 1b indicates a lower limit position.
At the side edge 2 of the web is provided a coupling box 3 which on its side facing the web is provided with two shielding-off devices in the form of two parallel pipes 4 and 5 which are located at different heights and are displaced relative each other in the longitudinal direction of the web. At their outer end portions the pipes 4, 5 are provided with small slit- shaped openings 6, 7 on their sides facing the web.
On the front side of the box 3 are furthermore provided two lamps 8, 9 which form light sources to throw a light beam 10 and 11, respectively, into the openings 7 and 6, respectively, the wall of the pipe around the opening being provided to shield-off any other light from the lamps. When the beams reach the openings 6, 7 unobstructed they will hit the detector located within the pipe which may be in the form of photo cells 12 and 13, respectively. Instead of the light sources 8, 9 it is possible to use an ultrasonic emitter, and corresponding detectors 12, 13 would in this case merely receive signals along the lines 10, 11.
In the intermediate position indicated in FIG. 1 by a solid line for the web 1, the side edge 2 of the web will extend into the path of signal lines 10, 11 so that the signals to the detectors 12, 13 are shielded-off by the edge portion of the web. Since the device of FIG. 1 is symmetrically constructed seen in the longitudinal direction of the web the lines 10, 11 will cross each other in a point 14. The web 1 will'pass through this point 14 in its intermediate position and will extend somewhat beyond this point. Depending on the distance of the side edge 2 from the point 14 the side edge may be moved upwardly or downwardly within a greater or lesser range before the edge passes the one or the other of the lines 10, 11. If the edge 2 is positioned further inwardly toward coupling box 3, that is at a greater distance from the point 14, it may move upwardly and downwardly within a greater range between the lines 10, 11 before any signal will reach the detectors 12, 13.
From FIG. 1 it will be seen that the devicewill also sense displacements in a transverse direction of the edge 2.
Preferably, two devices of the kind shown in FIG. 1 are employed and are placed at each side edge of the web 1. Accordingly, there will also be obtained a very accurate control of the movement of the web in a transverse direction. A plurality of devices according to the invention may be placed along the length of the web so that on a central control desk it will be possible to observe any changes of the web at predetermined places between the various stations for the treatment of the web. The device shown is primarily intended for paper webs for printing of newspapers but Webs of any other material may advantageously be controlled by means of the sensing device according to the invention.
What I claim is:
1. A device for sensing the planar displacement of a continuous web comprising in combination at least two beam-emitting means and a, corresponding number of beam-receiving means located adjacent one edge of said web,
each of said beam-receiving means being being positioned to receive signals along a straight line path from the corresponding beam-emitting means, each of said beam-emitting means and the corresponding beam-receiving means being positioned on opposite sides of the main plane of said web and also on opposite sides of a plane coinciding with one edge of said web and being at right angles to said main plane,
whereby a predetermined upward movement of said web causes only one of said beam-receiving means to receive a beam, and a predetermined downward movement of said web causes the other of said beamreceiving means to receive a beam.
2. The device of claim l-which also senses the continuity of the web wherein each of said beam-emitting means and the coresponding beam-receiving means are positioned so that the straight line connecting each of said corresponding emitting and receiving means passes through the continuous web whereby neither of said beamreceiving means receives a beam while the web is continuous and while it does not have upward or downward movement above or below said predetermined upward or downward movement.
3. The device of claim 2 wherein each of said beamreceiving means extends from a holder which also contains said beam-emitting means and which provides adjustable positioning of said means.
4. The device of claim 2 wherein a pair of beam-emitting means and corresponding beam-receiving means are located adjacent both edges of said continuous web.
5. The device of claim 2 wherein said beam-emitting means emits light rays.
6. The device of claim 2 wherein said beam-emitting means are spaced from each other in the direction of movement of said web.
References Cited UNITED STATES PATENTS 5/1963 Early 250223 X 5/1963 Frommer et a1. 250 219 X US. Cl. X.R. 22620; 250223
US559905A 1965-07-06 1966-06-23 Device for monitoring the planar displacement of a continuous web Expired - Lifetime US3501642A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004265A2 (en) * 1978-03-20 1979-10-03 VOEST-ALPINE Aktiengesellschaft Device to determine the deviation from the middle of a tin-plate roll on a conveyor belt
EP0067880A1 (en) * 1980-12-30 1982-12-29 Fanuc Ltd. Robot control system
EP0067881A1 (en) * 1980-12-30 1982-12-29 Fanuc Ltd. Robot control system
EP0092433A1 (en) * 1982-04-19 1983-10-26 Fanuc Ltd. Robot control method and apparatus
DE3724656A1 (en) * 1987-07-25 1988-08-18 Daimler Benz Ag Multi-dimensional measuring machine
WO1992004595A1 (en) * 1990-08-29 1992-03-19 Celio Engineering Sa Device for the contactless determination of the position of soldering wires
US5328072A (en) * 1987-10-17 1994-07-12 J.M. Voith Gmbh Device for locating the edges of moving webs

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3089594A (en) * 1960-06-13 1963-05-14 Owens Illinois Glass Co Shape and height detection
US3090534A (en) * 1959-03-24 1963-05-21 Electric Eye Equipment Co Web guide control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090534A (en) * 1959-03-24 1963-05-21 Electric Eye Equipment Co Web guide control
US3089594A (en) * 1960-06-13 1963-05-14 Owens Illinois Glass Co Shape and height detection

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004265A2 (en) * 1978-03-20 1979-10-03 VOEST-ALPINE Aktiengesellschaft Device to determine the deviation from the middle of a tin-plate roll on a conveyor belt
EP0004265A3 (en) * 1978-03-20 1979-10-17 Voest-Alpine Aktiengesellschaft Device to determine the deviation from the middle of a tin-plate roll on a conveyor belt
EP0067880A1 (en) * 1980-12-30 1982-12-29 Fanuc Ltd. Robot control system
EP0067881A1 (en) * 1980-12-30 1982-12-29 Fanuc Ltd. Robot control system
EP0067880A4 (en) * 1980-12-30 1983-09-02 Fanuc Ltd Robot control system.
EP0067881A4 (en) * 1980-12-30 1983-09-20 Fanuc Ltd Robot control system.
US4571694A (en) * 1980-12-30 1986-02-18 Fanuc Limited Robot control system
EP0092433A1 (en) * 1982-04-19 1983-10-26 Fanuc Ltd. Robot control method and apparatus
DE3724656A1 (en) * 1987-07-25 1988-08-18 Daimler Benz Ag Multi-dimensional measuring machine
US5328072A (en) * 1987-10-17 1994-07-12 J.M. Voith Gmbh Device for locating the edges of moving webs
WO1992004595A1 (en) * 1990-08-29 1992-03-19 Celio Engineering Sa Device for the contactless determination of the position of soldering wires

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SE322241B (en) 1970-04-06
DE1573400A1 (en) 1970-10-29

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