EP0429970B1 - Commutateur pour rupture de bande - Google Patents

Commutateur pour rupture de bande Download PDF

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Publication number
EP0429970B1
EP0429970B1 EP90121858A EP90121858A EP0429970B1 EP 0429970 B1 EP0429970 B1 EP 0429970B1 EP 90121858 A EP90121858 A EP 90121858A EP 90121858 A EP90121858 A EP 90121858A EP 0429970 B1 EP0429970 B1 EP 0429970B1
Authority
EP
European Patent Office
Prior art keywords
web
deflection
break detector
longitudinal edge
plane
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
EP90121858A
Other languages
German (de)
English (en)
Other versions
EP0429970A3 (en
EP0429970A2 (fr
Inventor
Werner Dipl.-Ing. Kettl (Fh)
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.)
Grafotec Kotterer GmbH
Original Assignee
Grafotec Kotterer GmbH
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 Grafotec Kotterer GmbH filed Critical Grafotec Kotterer GmbH
Publication of EP0429970A2 publication Critical patent/EP0429970A2/fr
Publication of EP0429970A3 publication Critical patent/EP0429970A3/de
Application granted granted Critical
Publication of EP0429970B1 publication Critical patent/EP0429970B1/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
    • B65H26/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms
    • B65H26/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs
    • B65H26/025—Warning or safety devices, e.g. automatic fault detectors, stop-motions, for web-advancing mechanisms responsive to presence of irregularities in running webs responsive to web breakage

Definitions

  • the invention relates to a web break switch for web processing machines, in particular web-fed rotary printing presses, with at least one scanning device assigned to the web, preferably in the form of a light barrier that can be interrupted by the web and by means of which a signal can be generated in the event of an impermissible change in location of the web.
  • the scanning device here consists of light barriers provided above and below the normal path level, the transmitters and receivers of which are each arranged in the region of opposite longitudinal edges of the path in such a way that the light beam between the transmitter and receiver does not collide with the path during normal operation and in the event of an impermissible deflection the path is interrupted by this.
  • the deflection of the web in the event of a web break caused by a web break is said to be due to the cylinders of the last, before the break point passed printing unit.
  • the light barriers are arranged at a short distance behind these cylinders. It is true that the web rises when the web tension is eliminated due to the adhesive effect of the paint on one of the cylinders.
  • a web catching device which has a suction roller arranged a short distance below the web and a nozzle bar arranged above the web, the nozzles of which are blown with air, by means of which the web is pressed against the suction roller when the web tension is eliminated becomes.
  • the vacuum generated in the suction roll is registered by a pressure-voltage converter and converted into electrical signals for machine and unit control.
  • the suction roller provided here must be driven. A drive train branched off from the main machine drive is therefore required. This often makes retrofitting existing machines with such a device impossible or at least difficult, not to mention the required energy requirement.
  • each scanning device which is arranged in the region of a longitudinal edge of the web, is assigned a deflection device, by means of which a permanently on the area of the assigned Longitudinal edge of the web acting deflection force which can be overcome by the web train in the case of trouble-free operation can be generated, by means of which the longitudinal web edge can be deflected with respect to the web plane in the case of trouble-free operation and can be moved relative to the scanning device when the web train is omitted.
  • the arrangement according to the invention is advantageously location-independent. This enables the web break switch according to the invention to be arranged precisely where monitoring of the web is particularly appropriate, that is to say in experience in areas particularly prone to breakage, for example in the area of a dryer downstream of the last printing unit, and where access to other units is not impeded.
  • Decisive for the achievable, advantageous location independence is not only the deflection device assigned to each scanning device, but also its arrangement such that only one web edge has to be monitored and deflected. In the area of the web edge, the instability is felt the greatest and fastest when the web train ceases to exist, which ensures high reliability and particularly short dead times.
  • the fact that only the web edge is monitored results in not only a very compact arrangement, but also a highly simple and inexpensive construction.
  • no drive is advantageously required. As a result of the location independence achieved and the simple and compact, in particular drive-less design, it is therefore also easy to retrofit existing machines with the invention Web break switches possible.
  • the deflection device has an air nozzle, preferably a blowing nozzle, which is connected to a pressure difference generating device, preferably to a compressed air source, and is set up for a flow direction directed in the deflection direction, preferably arranged opposite the web surface at the rear in the deflection direction.
  • a blowing nozzle can be particularly advantageous because the compressed air source required here is usually already available in the form of a compressed air network.
  • the air jet that can be achieved with a blowing nozzle can be precisely aligned to the desired area of the longitudinal edge of the web and the force that can be generated in this way can be adjusted in a simple manner.
  • the use of a suction nozzle is advantageously associated with a certain vacuum cleaner effect.
  • a further advantageous measure can consist in that the scanning device is arranged with an axis inclined to the direction of force of the deflection device and extending within a plane running transversely to the longitudinal direction of the web.
  • the deflection device can expediently be arranged with a force direction running approximately perpendicular to the path plane and the scanning device with the axis intersecting the path plane at an acute angle. As a result of the direction of force perpendicular to the path plane, this results in a powerful, reliable deflection of the path.
  • a further, particularly advantageous measure can consist in the fact that the axis of the scanning device passed by a longitudinal edge of the web extends in the deflection direction of the web to the outside. This ensures that the deflected longitudinal edge of the web is brought out of engagement with the scanning device.
  • This can therefore simply be designed as a light barrier which scans the longitudinal edge of the web and is interrupted by the longitudinal edge of the web during normal operation, with a transmitter or receiver arranged above or below the web. In normal operation, the light beam between the transmitter and receiver is interrupted. In the event of a web break, the light beam is released between the transmitter and the receiver, producing the desired signal. Since no continuous signal is generated here, a simple circuit advantageously results.
  • the direction of force can the deflection device is directed vertically from top to bottom and the element of the scanning device arranged below the plane of the web is offset to the outside with respect to the assigned upper element, preferably arranged outside the longitudinal edge of the web.
  • Particularly short response times are to be expected here, since the fully effective deflection force is supported by gravity and since the longitudinal edge of the web is already brought out of engagement with the scanning device with a comparatively small deflection.
  • the paper web 1 on which FIG. 1 is based is printed in a printing machine indicated by its last printing unit 2 and then dried in a dryer 3.
  • the area of the dryer 3 belongs to the areas in which the paper web 1 is particularly at risk of pressure.
  • a web catching device 5 is provided upstream of the danger zone, here the dryer 3, which is activated in the event of a web break.
  • the web catching device 5 is simply designed as a web clamping device. Instead of such a clamping device, other designs are of course also conceivable, for example winding devices or web-cutting devices etc. Simultaneously with the activation of the web-catching device 5, the drive of the printing press 2 is stopped.
  • one or more web break switches 6 are provided in the danger zone, which monitor the position of the web and emit a signal in the event of an impermissible change in the location of the web.
  • corresponding web break switches 6 are provided in the area of the inlet and outlet of the dryer 3. These can each be received on a holder 7 attached to the housing of the dryer 3.
  • web break switches and web catch devices which can be activated thereby can also be provided in other endangered areas, for example in the area between two successive printing units.
  • the web break switches 6 each contain a light barrier, which consists of a transmitter 8 and a receiver 9, scanning an associated web longitudinal edge, the elements of which are arranged opposite one another with respect to the web level maintained during normal operation, that is to say above and below the normal web level.
  • the transmitter 8 is located above the web level and the receiver 9 below the web level.
  • the optical axis 10 of the light barriers indicated by a dash-dotted line in FIG. 2 corresponds to the beam path of the light beam between the transmitter and the assigned receiver.
  • the optical axis 10 of the light barriers of the web break switches 6 arranged in the region of the web longitudinal edges is cut by the respectively assigned longitudinal edge of the web 1, as can be clearly seen from FIG.
  • the light beam between the transmitter 8 and the receiver 9 is interrupted by the longitudinal edge of the paper web 1 immersed between the transmitter 8 and the receiver 9.
  • the light barrier containing the transmitter 8 and the receiver 9 accordingly emits no signal.
  • the longitudinal edge of the paper web 1 which dips into the light barrier can be deflected relative to the normal web plane to such an extent that the intersection between the optical Axis 10 and the paper web 1 and thus the interruption of the beam path between the transmitter 8 and the receiver 9 omitted.
  • the light beam emitted by the transmitter 8 strikes the receiver 9, as a result of which the receiver generates a signal which can be used to activate the web catching device 5 and to stop the printing press 2, as in FIG. 1 through the signal line 11 with the web break switches 6 outgoing inputs 12 and the web guiding device 5 and the printing machine 2 leading outputs 13 is indicated.
  • each scanning device here in the form of a light barrier, is assigned a deflection device, which in the exemplary embodiment shown is simply as in the area of the assigned scanning device the top of the longitudinal edge of the paper web 1 directed blowing nozzle 14 is formed, which can be acted upon with compressed air.
  • the blowing nozzles are connected to a compressed air source, here in the form of an internal compressed air network 15, as indicated in FIG. 1 by spur lines 16.
  • blowing nozzles 14 are directed approximately perpendicular to the normal transport plane of the paper web 1 onto the region of the longitudinal edge of the paper web 1 which engages in the light barrier, here towards the longitudinal edge region lying outside the intersection between the optical axis 10 and the paper web 1.
  • Force indicated by the arrow 17 are set so that the longitudinal edge of the paper web 1 is not deflected when the web is present, that is to say during normal operation. In normal operation, the force indicated by arrow 17 is accordingly overcome by the train. Only when the web tension is omitted as a result of a web break that has occurred does the blowing nozzle 14 cause the deflection of the associated longitudinal edge of the paper web 1, indicated by a broken line in FIG. 2, as a result of which the switching process described above is brought about.
  • the blowing nozzle 14 directed perpendicularly to the longitudinal edge region of the paper web 1 brings about a downward deflection of the lateral edge region of the paper web 1.
  • the optical axis 10 of the light barrier forming the scanning device is arranged parallel to a plane running transversely to the longitudinal direction of the paper web 1 and inclined relative to the normal transport plane of the paper web so that it is in the deflection direction, that is to say from top to bottom , runs outwards.
  • the receiver 9 of the light barrier arranged below the normal transport plane of the paper web 1 is accordingly offset from the outside relative to the transmitter 8 arranged above the normal transport plane of the paper web 1.
  • the optical axis 10 is inclined at an acute angle of 45 ° with respect to the normal paper web plane, which is a wide offset between Transmitter 8 and receiver 9 enables.
  • the element of the scanning device here the receiver 9, which is arranged below the plane of the paper web
  • the element of the scanning device here the receiver 9, which is arranged below the plane of the paper web
  • the upper element that is to say the rear element in the deflection direction, here the transmitter 8, can be arranged within the paper web 1 without further notice.
  • a suction nozzle could also be provided, through which the associated edge region of the paper web 1 is sucked in as soon as it is unstable enough.
  • a suction nozzle would have to be arranged below the normal paper web plane.
  • the light barrier which acts as a scanning device, in such a way that a normal signal is generated during normal operation, which signal is interrupted in the event of a deflection of the paper web.
  • only the optical axis 10 would have to be rotated by 90 ° and moved outwards to such an extent that no collision between axis 10 and paper web 1 takes place during normal operation.
  • FIG. 2 two web break switches 6 which are opposite one another and are arranged symmetrically with respect to a web with a longitudinal plane are indicated.
  • a high level of safety and particularly short dead times are achieved, since the tear of a paper web is always on one longitudinal edge begins and ends at the other longitudinal edge. If both longitudinal edges are monitored, it is ensured that the desired switching process takes place at the start of a crack.
  • the light barrier on which the above-described example is based to form the scanning device represents a particularly simple, inexpensive and robust component.
  • electrical switches for scanning the longitudinal edges of the web expediently in the form of so-called capacitive switches. This would also make it possible to achieve contactless path scanning.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)

Claims (10)

  1. Commutateur pour rupture de bande pour des machines traitant des bandes, notamment des machines à imprimer rotatives à bobines, avec au moins un dispositif de balayage associé à la bande (1), de préférence sous la forme d'un barrage photo-électrique (8, 9, 10) qui peut être interrompu par la bande (1) et qui permet de produire un signal en cas de modification inadmissible de l'emplacement de la bande, caractérisé en ce qu'à chaque dispositif de balayage (8, 9, 10), qui est disposé dans la région d'un bord longitudinal de la bande (1), est associé un dispositif de déviation (14) qui permet de produire une force de déviation (17), agissant en permanence sur la région du bord longitudinal associé de la bande (1) et pouvant être surmontée par la traction de la bande en fonctionnement sans défaillances, force qui permet, en fonctionnement sans défaillances, de dévier le bord longitudinal de la bande (1) par rapport au plan de la bande lorsque la traction de la bande est supprimée, et de le déplacer par rapport au dispositif de balayage (8, 9, 10).
  2. Commutateur pour rupture de bande selon la revendication 1, caractérisé en ce que le dispositif de déviation présente au moins une buse à air (14), qui est raccordée à un dispositif de production de pression différentielle et est disposée pour une direction d'écoulement dirigée dans la direction de déviation.
  3. Commutateur pour rupture de bande selon la revendication 2, caractérisé en ce que le dispositif de déviation présente au moins une buse soufflante (14), qui est raccordée à une source d'air comprimé (15) et qui est disposée en face de la surface arrière, dans la direction de déviation, de la bande (1).
  4. Commutateur pour rupture de bande selon l'une des revendications précédentes, caractérisé en ce que le dispositif de balayage (8, 9, 10) est disposé avec son axe (10) oblique par rapport à la direction de force du dispositif de déviation (14) et s'étendant dans un plan transversal à la direction longitudinale de la bande (1).
  5. Commutateur pour rupture de bande selon la revendication 4, caractérisé en ce que le dispositif de balayage (8, 9, 10) est disposé avec son axe (10) coupant le plan de la bande sous un angle aigu égal de préférence à 45°.
  6. Commutateur pour rupture de bande selon l'une des revendications précédentes, caractérisé en ce que le dispositif de déviation (14) est disposé avec sa direction de force s'étendant approximativement perpendiculairement au plan de la bande.
  7. Commutateur pour rupture de bande selon l'une des revendications précédentes 4 à 6, caractérisé en ce que l'axe (10) du dispositif de balayage (8, 9, 10) devant lequel est passé un bord longitudinal de la bande (1) s'étend vers l'extérieur dans la direction de déviation de la bande (1).
  8. Commutateur pour rupture de bande selon la revendication 7, caractérisé en ce que, dans le cas d'un dispositif de balayage en deux parties, de préférence sous la forme d'un barrage photo-électrique avec deux éléments disposés sur un axe (10) coupant le plan de la bande (1) et mutuellement opposés par rapport à la bande (1), de préférence sous la forme d'un émetteur (8) et d'un récepteur (9), l'élément avant (9) dans la direction de déviation est décalé vers l'extérieur par rapport à l'élément arrière (8) dans la direction de déviation.
  9. Commutateur pour rupture de bande selon la revendication 8, caractérisé en ce que l'élément avant (9) dans la direction de déviation est disposé à l'extérieur, et l'élément arrière (8) dans la direction de déviation à l'intérieur, du bord longitudinal associé de la bande (1).
  10. Commutateur pour rupture de bande selon l'une des revendications précédentes 6 à 9, caractérisé en ce que la direction de force du dispositif de déviation (14) est dirigée verticalement de haut en bas, et en ce que l'élément (9) du dispositif de balayage (8, 9, 10) qui est disposé en dessous du plan normal de la bande est décalé vers l'extérieur par rapport à l'élément supérieur (8) de ce dispositif, en étant de préférence disposé à l'extérieur du bord longitudinal de la bande.
EP90121858A 1989-11-28 1990-11-15 Commutateur pour rupture de bande Expired - Lifetime EP0429970B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3939226 1989-11-28
DE3939226A DE3939226A1 (de) 1989-11-28 1989-11-28 Bahnreissschalter

Publications (3)

Publication Number Publication Date
EP0429970A2 EP0429970A2 (fr) 1991-06-05
EP0429970A3 EP0429970A3 (en) 1991-09-11
EP0429970B1 true EP0429970B1 (fr) 1994-10-19

Family

ID=6394295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90121858A Expired - Lifetime EP0429970B1 (fr) 1989-11-28 1990-11-15 Commutateur pour rupture de bande

Country Status (4)

Country Link
US (1) US5130557A (fr)
EP (1) EP0429970B1 (fr)
JP (1) JP2884014B2 (fr)
DE (2) DE3939226A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109250559A (zh) * 2018-08-14 2019-01-22 安徽新网讯科技发展有限公司 一种包装带生产用收卷设备的报警装置

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DE4106901C2 (de) * 1991-03-05 1994-05-26 Kotterer Grafotec Verfahren und Vorrichtung zur Überwachung einer Bahn
DE4134590C2 (de) * 1991-10-19 1996-02-15 Kotterer Grafotec Vorrichtung zur Überwachung der Bahnabwicklung in einer Rollenrotationsdruckmaschine
US5228893A (en) * 1991-11-27 1993-07-20 At&T Bell Laboratories Optical fiber tension monitoring technique
US5233200A (en) * 1991-12-23 1993-08-03 At&T Bell Laboratories Method and apparatus for contactless monitoring of tension in a moving fiber
US6298782B1 (en) 1993-03-25 2001-10-09 Baldwin Web Controls Anti-wrap device for a web press
US5678484A (en) * 1993-03-25 1997-10-21 Baldwin Web Controls Anti-wrap device for a web press
US5694524A (en) * 1994-02-15 1997-12-02 R. R. Donnelley & Sons Company System and method for identifying conditions leading to a particular result in a multi-variant system
JPH08254504A (ja) * 1994-11-29 1996-10-01 Zellweger Luwa Ag 伸長された物体の特性を記録するための方法と装置
DE19734137C2 (de) * 1997-08-07 2001-07-12 Baldwin Grafotec Gmbh Vorrichtung zur Verhinderung von Druckwerksbeschädigungen
US5942689A (en) * 1997-10-03 1999-08-24 General Electric Company System and method for predicting a web break in a paper machine
US6466877B1 (en) 1999-09-15 2002-10-15 General Electric Company Paper web breakage prediction using principal components analysis and classification and regression trees
US6405140B1 (en) 1999-09-15 2002-06-11 General Electric Company System and method for paper web time-break prediction
US6498993B1 (en) 2000-05-30 2002-12-24 Gen Electric Paper web breakage prediction using bootstrap aggregation of classification and regression trees
DE102004017676B4 (de) * 2004-04-10 2008-09-11 Baldwin Germany Gmbh Fehlererfassungsvorrichtung einer Rollenrotations-Druckmaschine
US8157199B2 (en) * 2005-08-31 2012-04-17 Kimberly-Clark Worldwide, Inc. Rewinder web chop with early detection and web diversion to eliminate equipment damage
DE102005041919B4 (de) * 2005-09-03 2008-05-29 Baldwin Germany Gmbh Bahnbruch-Überwachungseinrichtung für Rollenrotationsdruckmaschinen
DE102006050906B3 (de) * 2006-10-28 2008-05-29 Baldwin Germany Gmbh Automatische Bahnfangvorrichtung für Rollenrotationsdruckmaschinen

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109250559A (zh) * 2018-08-14 2019-01-22 安徽新网讯科技发展有限公司 一种包装带生产用收卷设备的报警装置
CN109250559B (zh) * 2018-08-14 2020-05-19 安徽新网讯科技发展有限公司 一种包装带生产用收卷设备的报警装置

Also Published As

Publication number Publication date
EP0429970A3 (en) 1991-09-11
DE59007504D1 (de) 1994-11-24
EP0429970A2 (fr) 1991-06-05
JP2884014B2 (ja) 1999-04-19
US5130557A (en) 1992-07-14
JPH03180347A (ja) 1991-08-06
DE3939226A1 (de) 1991-05-29

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