EP0538672A1 - 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
EP0538672A1
EP0538672A1 EP92117079A EP92117079A EP0538672A1 EP 0538672 A1 EP0538672 A1 EP 0538672A1 EP 92117079 A EP92117079 A EP 92117079A EP 92117079 A EP92117079 A EP 92117079A EP 0538672 A1 EP0538672 A1 EP 0538672A1
Authority
EP
European Patent Office
Prior art keywords
web
gap
pressure
break switch
switch 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.)
Granted
Application number
EP92117079A
Other languages
German (de)
English (en)
Other versions
EP0538672B1 (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 monitoring the web tension, by means of which a signal can be generated in the event of a drop in the web tension.
  • a device of this type is known from DE 39 39 226 A1.
  • the monitoring device consists of a light barrier, the optical axis of which is cut by a longitudinal edge of the web, and one on the web with the normal web train wind power that can be overcome.
  • the light barrier and the blow nozzle assigned to it it is necessary to set the light barrier and the blow nozzle assigned to it exactly on the edge of the web.
  • the strength of the blown air must be adjusted depending on the paper quality. Overall, therefore, there is a high adjustment effort. There is also a risk of incorrect operation.
  • the known arrangement therefore proves to be not user-friendly and reliable enough.
  • the monitoring device is designed as a pressure measuring device which has at least one pressure sensor in the web which receives the pressure in normal operation, on the one hand from the web and on the other hand from a gap passed by the web and bounded by a stationary cover, and in the case of a Pressure drop in the gap generates a signal.
  • the arrangement according to the invention advantageously does not require any individual adjustment depending on the web width and paper quality, but can simply be adjusted during start-up in such a way that all the webs in question for processing can be reliably scanned. Nevertheless, the invention offers Arrangement has a high response speed, since the gap between the web and cover suddenly increases in the event of a web break, with the collapse of an overpressure existing during normal operation. Another advantage of the measures according to the invention can be seen in the fact that there is no web contact in the area of the stationary cover, so that despite the use of a stationary part there is no risk of damage to the web surface, which usually bears fresh pressure.
  • the monitoring device can be designed as a differential pressure measuring device which has a pressure sensor which takes up the gap pressure and a pressure sensor which takes up the ambient pressure and generates a signal when the gap pressure approaches the ambient pressure, preferably when a pressure difference is eliminated.
  • the cover can advantageously be designed as a fixed plate parallel to the path. This measure results in a large gap in which a reliable pressure build-up can take place.
  • a further advantageous measure can consist in that the plate forming the cover has at least one chamber delimited by a peripheral edge and open on the web side has that can be scanned by means of the assigned pressure sensor.
  • the chamber mentioned advantageously facilitates the absorption of the gap pressure and also results in a good gap pressure equalization.
  • the plate can expediently have a plurality of chambers, the centrally arranged chamber being able to be scanned by means of the associated pressure sensor. This measure makes it easier to achieve a particularly high pressure.
  • a blowing device which can be acted upon by air and having 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-blowing device with at least one nozzle opening out towards the gap can also be provided in the region 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 change in pressure is used to activate the safety gear 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 present 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 which is designed as a cantilever arm and can be mounted on a machine side wall.
  • the plate 7 is arranged so that it is completely within the paper web 1, i.e. this is laterally towered over. The arrangement can be made so that this is the case when processing all possible web widths.
  • the distance from the underside of the plate 7, which is 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 a plurality of 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 is accordingly recorded in the central chamber 19.
  • the gap 8 and the chambers 19 communicating therewith are acted upon with 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 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 which are continuous over the plate width and 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 22 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 ° in each case.
  • 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 means of their axial bores 25, each closing end tabs 26.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
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
DE4134590A DE4134590C2 (de) 1991-10-19 1991-10-19 Vorrichtung zur Überwachung der Bahnabwicklung in einer Rollenrotationsdruckmaschine
DE4134590 1991-10-19

Publications (2)

Publication Number Publication Date
EP0538672A1 true EP0538672A1 (fr) 1993-04-28
EP0538672B1 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
Publication number Priority date Publication date Assignee Title
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
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
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
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
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159028A (en) * 1961-02-15 1964-12-01 Beloit Corp Sheet break detector
US3178527A (en) * 1963-02-01 1965-04-13 Cooksey Otha Air actuated web break detector
US3201985A (en) * 1961-06-07 1965-08-24 British Cellophane Ltd Web tension measuring devices
DE2403748A1 (de) * 1974-01-26 1975-08-07 Hauni Werke Koerber & Co Kg Anordnung zum ueberwachen eines streifens auf abriss
EP0061671A2 (fr) * 1981-03-20 1982-10-06 E.I. Du Pont De Nemours And Company Détecteur de proximité
DE3525706A1 (de) * 1984-07-18 1986-01-30 Svenska Träforskningsinstitutet, Stockholm Verfahren und vorrichtung zum messen der bahnspannung einer papier- oder folienbahn
DE3920310A1 (de) * 1988-06-21 1989-12-28 Tokyo Kikai Seisakusho Ltd Materialbahnspannungsmesser und materialbahnspannungsregler

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2132248C3 (de) * 1970-08-03 1980-02-28 Veb Kombinat Polygraph Werner Lamberz Leipzig, Ddr 7050 Leipzig Pneumatisch arbeitende Vorrichtung zum Auslösen von Zähl- und/oder Abschaltvorgängen, insbesondere für Druckmaschinen
SE444861B (sv) * 1984-09-10 1986-05-12 Per Roode Berglund Beroringsfri banspenningsmetare
JPS6194764A (ja) * 1984-10-17 1986-05-13 Mitsubishi Heavy Ind Ltd 輪転印刷機の共切れ防止方法
US4838498A (en) * 1988-02-22 1989-06-13 Rockwell International Corporation Web tensioning system
US4968386A (en) * 1988-05-10 1990-11-06 Union Camp Corporation Apparatus for determining amplitude and frequency of web flutter
FI80522C (fi) * 1988-09-14 1990-06-11 Valmet Paper Machinery Inc Foerfarande och anordning foer maetning av spaenningen i en bana.
DE3939226A1 (de) * 1989-11-28 1991-05-29 Kotterer Grafotec Bahnreissschalter
US5190201A (en) * 1991-01-16 1993-03-02 Quad/Tech, Inc. Method and apparatus for detecting the presence of a web within a web dryer

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3159028A (en) * 1961-02-15 1964-12-01 Beloit Corp Sheet break detector
US3201985A (en) * 1961-06-07 1965-08-24 British Cellophane Ltd Web tension measuring devices
US3178527A (en) * 1963-02-01 1965-04-13 Cooksey Otha Air actuated web break detector
DE2403748A1 (de) * 1974-01-26 1975-08-07 Hauni Werke Koerber & Co Kg Anordnung zum ueberwachen eines streifens auf abriss
EP0061671A2 (fr) * 1981-03-20 1982-10-06 E.I. Du Pont De Nemours And Company Détecteur de proximité
DE3525706A1 (de) * 1984-07-18 1986-01-30 Svenska Träforskningsinstitutet, Stockholm Verfahren und vorrichtung zum messen der bahnspannung einer papier- oder folienbahn
DE3920310A1 (de) * 1988-06-21 1989-12-28 Tokyo Kikai Seisakusho Ltd Materialbahnspannungsmesser und materialbahnspannungsregler

Also Published As

Publication number Publication date
DE59206107D1 (de) 1996-05-30
JPH05215669A (ja) 1993-08-24
EP0538672B1 (fr) 1996-04-24
JP3245751B2 (ja) 2002-01-15
DE4134590A1 (de) 1993-04-22
US5301866A (en) 1994-04-12
DE4134590C2 (de) 1996-02-15

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