EP0538672B1 - Commutateur de rupture de bande pour machines utilisant des bandes - Google Patents

Commutateur de rupture de bande pour machines utilisant des bandes Download PDF

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Publication number
EP0538672B1
EP0538672B1 EP92117079A EP92117079A EP0538672B1 EP 0538672 B1 EP0538672 B1 EP 0538672B1 EP 92117079 A EP92117079 A EP 92117079A EP 92117079 A EP92117079 A EP 92117079A EP 0538672 B1 EP0538672 B1 EP 0538672B1
Authority
EP
European Patent Office
Prior art keywords
web
gap
pressure
break detector
detector according
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
EP92117079A
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German (de)
English (en)
Other versions
EP0538672A1 (fr
Inventor
Karl Veh
Andreas Birkenfeld
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 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 EP0538672A1 publication Critical patent/EP0538672A1/fr
Application granted granted Critical
Publication of EP0538672B1 publication Critical patent/EP0538672B1/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/18—Web break detection

Definitions

  • the invention relates to a web break switch for web processing machines, in particular web-fed rotary printing presses, with a monitoring device which monitors the web tension and has a pressure measuring device provided with a pressure sensor, which is assigned a gap between the web which can be acted upon by air and a stationary gap cover which is passed by the web during normal operation and generates a signal in the event of a drop in the pressure in the gap caused by a drop in the web tension.
  • a web break switch of this type is known from US-A 3 159 028.
  • a pipe connected to a compressed air source is provided, the obliquely cut end of which is placed at a clear distance above or below the web, so that there is a gap.
  • the compressed air source pressurizes this from the inside with compressed air that escapes laterally over the edge of the gap.
  • the said gap thus represents a throttle point associated with the pipeline, which is eliminated in the event of a web break. If the throttling point ceases to exist, the back pressure caused by it also ceases.
  • the pressure in the pipeline is detected by a monometer arrangement which emits a signal in the event of a pressure breakdown.
  • the gap with air entrained by the web and that the gap cover is designed as a web-parallel cover plate having at least one chamber on the web side open, from which a bore extends, to which the pressure sensor is attached.
  • the pressure built up by the air entrained by the web which is moved at high speed, or the loss of this pressure, is used to indicate a web break.
  • This not only ensures a high response speed and contactless operation, but also ensures that no individual adjustment depending on the paper quality and the like is required.
  • the measures according to the invention therefore ensure a high level of user friendliness and reliability.
  • a blowing device which can be acted upon by air can be provided with at least one nozzle opening out towards the gap.
  • a blowing device supports and improves the air supply to the gap caused by the moving web.
  • an air-inflatable blowing device with at least one nozzle opening out towards the gap can also be provided in the area of the front edge of the gap in the running direction of the web.
  • the plate forming the cover is expediently arranged above the web, so that the web automatically moves away from the plate in the event of a web break due to gravity.
  • a safety device 4 arranged upstream of the danger zone, here the dryer 3, and downstream of the printing press 2 is provided.
  • the structure and mode of operation of such safety devices are known per se and therefore require no further explanation in the present context.
  • the catching device 4 is activated by a signal generated by means of a web break switch designated as a whole by 5, as indicated by a signal flow arrow 6.
  • the web break switch 5 contains a stationary plate 7 which overlaps the paper web 1 in an edge region and which, together with the contactless one, on the lower web parallel Sheet surface 1 pasted paper web 1 limited a gap 8. Overpressure builds up in gap 8 during normal operation. In the event of a web break, the paper web 1 becomes tensionless and slack, as a result of which the gap 8 automatically increases and the excess pressure present therein collapses. This pressure change is used to activate the safety device 4.
  • a pressure sensor 9 attached to the plate 7 is provided, the measuring input 10 of which is accessible from the gap 8. With the help of the pressure sensor 9, the pressure existing in the gap 8 can accordingly be recorded.
  • the web break switch 5 contains a further pressure sensor 11 which receives the ambient pressure.
  • the outputs of the pressure sensors 9 and 11 are, as indicated by signal flow arrows 12, 13, at the inputs of a subtraction element 14 which detects the ambient pressure received by means of the pressure sensor 11 of the pressure sensor 9 subtracted gap pressure.
  • the gap pressure is greater than the ambient pressure, so that the subtraction element 14 determines a pressure difference.
  • the output of the subtraction element 14 is, as indicated by the signal arrow 15, at the input of a Switching element 16 through which the actuating device of the safety device 4 can be actuated.
  • the circuit of the switching element 16 is designed such that an activation signal is generated as soon as the difference determined by the subtraction element 14 approaches zero.
  • the activation signal generated by the switching element 16 is transmitted via the signal line 6 to the actuating device of the safety device 4.
  • the pressure sensor 11 and / or the subtraction element 14 and / or the switching element 16 can be combined in a practical embodiment with the pressure sensor 9 to form a structural unit.
  • the stationary plate 7 is carried by a bracket 17 designed as a cantilever arm and mountable on a machine side wall.
  • the plate 7 is arranged so that it is completely within the paper web 1, i.e. is laterally towered over by it. The arrangement can be made so that this is the case when processing all possible web widths.
  • the distance between the underside of the plate 7 parallel to the transport plane of the paper web 1 from the regular transport plane of the paper web 1 is small. This distance is expediently less than a millimeter.
  • the plate 7 is provided with several chambers 19, here with 9 distributed over three rows, open towards the paper web 1 and delimited by circumferential webs 18.
  • the central chamber 19 is drilled from the top of the plate.
  • the pressure sensor 9 is attached to the bore 20 provided for this purpose.
  • the Bore 20 is designed as a threaded bore into which a connecting piece containing the pressure input of the pressure sensor 9 is screwed. With the help of the pressure sensor 9, the pressure in the central chamber 19 is accordingly recorded.
  • the gap 8 and the chambers 19 communicating therewith are subjected to air by the air entrained by the paper web 1 moving at high speed in such a way that an overpressure is formed in the gap 8 and accordingly also in the chambers 19 communicating therewith.
  • these flanks can, as can best be seen from FIG. 1, be designed as phase-shaped tapered portions 21.
  • upstream and / or downstream blowing devices are provided to stabilize the gap pressure of the plate 7.
  • nozzle bars 22 which run along the rear and front edge of the plate 7 in the running direction of the paper web and are continuous across the plate width and which are provided with blowing nozzles 23 which are uniformly distributed over the plate width. These are aligned so that there is a blowing direction with a component directed into the gap 8.
  • the nozzle axis of the blowing nozzles 23 of the rear blowing device is inclined towards the rear with respect to a solder on the transport plane of the paper web 1 and the nozzle axis of the blowing nozzles 23 of the front blowing device is inclined towards the front with respect to a solder on the transport plane of the paper web 1. In the example shown, this inclination is 45 ° each.
  • the nozzle bars 22 are supplied with blown air through laterally connected compressed air lines 24.
  • the throughput volume and the pressure are chosen so that the dynamic pressure acting on the paper web 1 during normal operation is easily overcome by the web tension, so that this does not cause the paper web 1 to evade.
  • the nozzle bars 22 are designed as drilled, square cross-section rails.
  • the axial bore 25 connected to a compressed air line 24 forms a distribution chamber from which the blow nozzles 23 extend. These can simply be designed as diagonal bores, which results in a long nozzle length and thus reliable air flow.
  • the nozzle bars 22 are fastened to the plate 7 by their axial bores 25, each closing front plates 26.

Landscapes

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

Claims (8)

  1. Détecteur de casse pour des machines traitant des bandes, en particulier des presses rotatives à imprimer, muni d'un mécanisme de surveillance qui surveille la tension de la bande qui présente un mécanisme de mesure de la pression équipé d'un capteur de pression (9), qui est attribué à une fente (8) qui peut être sollicitée avec de l'air, entre la bande (1) et un recouvrement de fente stationnaire qui est passé lors du fonctionnement normal de la bande (1) et qui, dans le cas d'une chute de la pression régnant dans la fente (8), provoquée par une chute de la tension de la bande, émet un signal, caractérisé en ce que la fente (8) est sollicitée avec de l'air entraîné par la bande (1) et en ce que le recouvrement de fente est réalisé sous forme d'une plaque de recouvrement (7) parallèle à la bande, qui présente au moins une chambre (19) ouverte côté bande, à partir de laquelle s'étend un alésage (20) auquel est relié le capteur de pression (9).
  2. Détecteur de casse selon la revendication 1, caractérisé en ce que le mécanisme de surveillance est réalisé sous forme d'un mécanisme de mesure de la pression différentielle, qui présente un capteur de pression (9) captant la pression régnant dans la fente et un capteur de pression (11) captant la pression environnante, et qui, dans le cas où la pression régnant dans la fente s'approche de la pression environnante, de préférence lorsque la différence de pression fait défaut, émet un signal.
  3. Détecteur de casse selon l'une quelconque des revendications précédentes, caractérisé en ce que la plaque (7) présente plusieurs chambres (19) et en ce que la chambre (19) disposée en position centrale peut être palpée au moyen du capteur de pression (9) qui lui est attribué.
  4. Détecteur de casse selon l'une quelconque des revendications précédentes, caractérisé en ce que, dans la zone de l'arête arrière de la fente (8) dans le sens de défilement de la bande (1), on prévoit un mécanisme de soufflerie qui peut être sollicité avec de l'air, comportant au moins une buse (23) dont la sortie est dirigée vers la fente (8).
  5. Détecteur de casse selon l'une quelconque des revendications précédentes, caractérisé en ce que, dans la zone de l'arête avant de la fente (8) dans le sens de défilement de la bande (1), on prévoit un mécanisme de soufflerie qui peut être sollicité avec de l'air, comportant au moins une buse (23) dont la sortie est dirigée vers la fente (8).
  6. Détecteur de casse selon la revendication 4 ou 5, caractérisé en ce que le mécanisme de soufflerie monté en amont et/ou en aval par rapport à la fente (8) est réalisé en forme de barre à tuyères (22) s'étendant sur la largeur de la plaque (7).
  7. Détecteur de casse selon l'une quelconque des revendications précédentes, caractérisé en ce que la plaque (7) se rétrécit dans la zone de ses flancs avant et arrière.
  8. Détecteur de casse selon l'une quelconque des revendications précédentes, caractérisé en ce que la plaque (7) est disposée au-dessus de la bande (1).
EP92117079A 1991-10-19 1992-10-07 Commutateur de rupture de bande pour machines utilisant des bandes Expired - Lifetime EP0538672B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4134590 1991-10-19
DE4134590A DE4134590C2 (de) 1991-10-19 1991-10-19 Vorrichtung zur Überwachung der Bahnabwicklung in einer Rollenrotationsdruckmaschine

Publications (2)

Publication Number Publication Date
EP0538672A1 EP0538672A1 (fr) 1993-04-28
EP0538672B1 true EP0538672B1 (fr) 1996-04-24

Family

ID=6443000

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92117079A Expired - Lifetime EP0538672B1 (fr) 1991-10-19 1992-10-07 Commutateur de rupture de bande pour machines utilisant des bandes

Country Status (4)

Country Link
US (1) US5301866A (fr)
EP (1) EP0538672B1 (fr)
JP (1) JP3245751B2 (fr)
DE (2) DE4134590C2 (fr)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
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US6098063A (en) * 1994-02-15 2000-08-01 R. R. Donnelley & Sons Device and method for identifying causes of web breaks in a printing system on web manufacturing attributes
US6507832B1 (en) 1994-02-15 2003-01-14 R.R. Donnelley & Sons Company Using ink temperature gain to identify causes of web breaks in a printing system
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
US6336106B1 (en) 1994-02-15 2002-01-01 R.R. Donnelley & Sons Company System and method for partitioning a real-valued attribute exhibiting windowed data characteristics
US20020128990A1 (en) * 1997-05-01 2002-09-12 Kaminskas Paul A. Control methodology and apparatus for reducing delamination in a book binding system
US5942689A (en) * 1997-10-03 1999-08-24 General Electric Company System and method for predicting a web break in a paper machine
DE19827190A1 (de) * 1998-06-18 1999-12-23 Koenig & Bauer Ag Verfahren und Vorrichtung zur Überwachung einer Materialbahn
FI104762B (fi) * 1998-07-01 2000-03-31 Valmet Automation Inc Menetelmä ja laitteisto liikkuvan rainan kireyden mittaamiseksi
FI110343B (fi) * 1999-02-25 2002-12-31 Honeywell Oy Paperikoneen ratakatkojen monitorointijärjestelmä
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
JP2002310893A (ja) * 2001-04-13 2002-10-23 Unitika Ltd プラスチックフィルムの破断検知方法
DE10249396A1 (de) * 2002-10-23 2004-05-06 Voith Paper Patent Gmbh Anordnung zur indirekten oder direkten Erfassung eines lokalen Bahnzugs einer laufenden Materialbahn an wenigstens einer Bahn-Querposition
DE10327910B4 (de) * 2003-06-20 2012-01-26 Baldwin Germany Gmbh Bahnfangvorrichtung
EP2275812A1 (fr) 2009-07-15 2011-01-19 Stichting Dutch Polymer Institute Appareil de surveillance des propriétés mécaniques d'un corps filamenteux ou planaire mobile et procédé de surveillance
CN106586622A (zh) * 2016-12-19 2017-04-26 柳州市代代福针织服装有限公司 一种裁布架
JP7082957B2 (ja) 2019-06-05 2022-06-09 東芝三菱電機産業システム株式会社 回転子冷却構造およびタービン発電機
US20220002107A1 (en) * 2020-07-01 2022-01-06 CSG Holding, Inc. Webtension transducer load cell with integrated data interface
CN113320753B (zh) * 2021-05-31 2023-07-21 新乡北新建材有限公司 一种自动龙骨生产包装线用胶带供应系统及供应方法

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Also Published As

Publication number Publication date
JP3245751B2 (ja) 2002-01-15
DE4134590A1 (de) 1993-04-22
JPH05215669A (ja) 1993-08-24
DE59206107D1 (de) 1996-05-30
US5301866A (en) 1994-04-12
EP0538672A1 (fr) 1993-04-28
DE4134590C2 (de) 1996-02-15

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