EP0291721A2 - Machine à imprimer des feuilles en deux couleurs sur une face ou à retiration - Google Patents

Machine à imprimer des feuilles en deux couleurs sur une face ou à retiration Download PDF

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Publication number
EP0291721A2
EP0291721A2 EP88106461A EP88106461A EP0291721A2 EP 0291721 A2 EP0291721 A2 EP 0291721A2 EP 88106461 A EP88106461 A EP 88106461A EP 88106461 A EP88106461 A EP 88106461A EP 0291721 A2 EP0291721 A2 EP 0291721A2
Authority
EP
European Patent Office
Prior art keywords
sheet
transfer cylinder
gripper
fed rotary
sheet transfer
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
EP88106461A
Other languages
German (de)
English (en)
Other versions
EP0291721B1 (fr
EP0291721A3 (en
Inventor
Arno Wirz
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0291721A2 publication Critical patent/EP0291721A2/fr
Publication of EP0291721A3 publication Critical patent/EP0291721A3/de
Application granted granted Critical
Publication of EP0291721B1 publication Critical patent/EP0291721B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/106—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine

Definitions

  • the invention relates to a sheet-fed rotary printing press according to the preamble of the main claim.
  • a sheet-fed rotary printing press of the type in question is known from Japanese publication Sho 52-29 643, in which a storage drum located beneath it is assigned to the sheet transfer cylinder located between the two printing cylinders.
  • the sheet transfer cylinder contains grippers to grasp the trailing edge of the sheet. Before these grippers close, the sheet trailing edge is bent by about 90 degrees using a sheet guide plate on the storage drum side.
  • a sheet-fed rotary printing machine is not suitable for printing on cardboard.
  • the storage drum lying outside the normal sheet guide largely prevents the creation of a sheet-fed rotary printing press in a row design. Then it is not possible to smooth the sheet before taking over the following grippers, which favors inaccurate printing.
  • the object of the invention is based, to design a generic sheet-fed rotary printing press so that under Achieving a low overall height of the machine enables safe sheet turning, even with thick cardboard.
  • a major advantage of the solution according to the invention is that a low overall height of the machine can be achieved by the sheet support arranged downstream of the sheet transfer cylinder.
  • the sheet support fits into the overall design of the sheet-fed rotary printing press in a space-saving manner and is inexpensive to accommodate in a row construction concept. If the sheet is to be printed on the back after passing through the first printing unit, the leading edge of the sheet passes from the sheet transfer cylinder to the upper side of the support and is pushed onto the sheet support as the grippers holding the trailing edge approach the sheet. When the sheet transfer cylinder is rotated further, the sheet travels ahead with its grasped sheet trailing edge, accompanied by a turning of the sheet. This sheet turning can be done safely and precisely, combined with good printing results.
  • This sheet-fed rotary printing machine is also suitable for processing cardboard.
  • high throughput speeds can be achieved while the sheet-fed rotary printing press is highly economical.
  • a particularly good transfer of the sheet leading edge to the sheet support or pushing the corresponding sheet start onto this is achieved by arranging the sheet support in the gusset between the sheet transfer cylinder and the subordinate pressure cylinder reached below it.
  • the space available there is used to accommodate this sheet support. Because the peripheral surface of the sheet transfer cylinder overlaps the facing end of the sheet support to a certain extent, an additional sheet displacement component occurs and leads to an acceleration with respect to the sheet displacement onto the sheet support.
  • a kinking of the trailing edge of the sheet is reliably avoided during the turning process in that the corresponding grippers of the sheet transfer cylinder, after passing through the opposite face to the sheet transfer cylinder end of the sheet support, from their position in the direction of rotation of the sheet transfer cylinder facing the gripper jaw into the position of the gripper jaw opposite to the sheet transfer cylinder direction of rotation. Therefore, the gripper mouth always runs in the direction of the sheet plane and precludes kinking of the rear edge of the bow combined with a secure transfer of the rear sheet edge to the grippers of the subsequent printing cylinder.
  • the application of the leading edge of the sheet to the sheet support is favored in that it is designed as a circumferential band.
  • the direction of rotation of the belt preferably corresponds to the peripheral speed of the sheet transfer cylinder.
  • the speed of the belt is also adapted to the peripheral speed of the sheet transfer cylinder.
  • the detection of the trailing edge of the sheet by the sheet support is optimized by the upper side of the support, which bulges slightly in the direction of the printing cylinder.
  • An advantageous way to reliably detect the trailing edge of the sheet is that the as Plier gripper designed the gripper of the sheet transfer cylinder with its one gripper leg from an open position sunk into the sheet transfer cylinder by about 180 degrees in the opposite direction to the trailing edge of the sheet. This resulting gripper mouth can then perform the above-described pivoting movement during the turning process, in order to avoid kinking of the trailing edge of the sheet.
  • the suction nozzles arranged in front of the mouth of the gripper of the sheet transfer cylinder ensure that the gripper moving into the closed position can always reliably grasp the trailing edge of the sheet. If the suction nozzles are still pivotable in the circumferential direction of the sheet transfer cylinder, they can even be used to insert the trailing edge of the sheet into a facing gripper mouth of the gripper. After the trailing edge of the sheet has been sucked in, the suction nozzles initially pivot in the direction of rotation of the sheet transfer cylinder and thus cause the loop to be slightly looped on the leading edge by the additional grippers. Then the suction nozzles swivel back and push the trailing edge of the sheet into the open mouth of the gripper in conjunction with smoothing the sheet.
  • the sheet trailing edge is thus optimally fixed for the subsequent turning process.
  • An improved adhesion between the sheet support and the sheet is achieved by a friction lining assigned to the sheet support.
  • a friction lining assigned to the sheet support.
  • a suction nozzle can also be assigned to the sheet support belt.
  • chain gripper systems it is also possible to assign chain gripper systems to the belt. However, it is always ensured that the leading edge of the sheet is optimally transported through the sheet support.
  • the sheet-fed rotary printing press illustrated schematically in FIG. 1 has a plurality of printing units 1, 2 and 3 arranged in series in a row.
  • Each printing unit contains a printing cylinder 4,5,6, a rubber cylinder 7,8,9 and a plate cylinder 10,11,12.
  • the inking units assigned to the plate cylinders are not shown.
  • the sheets 13 to be printed are fed in a known manner to the printing cylinder 4 of the first printing unit 1 through a feed drum 14 located on the machine input side.
  • a sheet transfer cylinder 15 is arranged between the printing cylinders 4 and 5 of the two first printing units 1, 2. Another arch over The feed cylinder 16 extends between the impression cylinders 5 and 6.
  • the axes of rotation 17, 18 of the sheet transfer cylinders 15/16 lie below the axes 19, 20, 21 of the impression cylinders. Otherwise, the diameter of the sheet transfer cylinder 15, 16 is three times that of the blanket cylinder 7, 8, 9.
  • Two rows of clamping grippers 22 are provided for holding the sheets 13 on the printing cylinder 4 of the first printing unit 1 in a diametrically opposed position on the printing cylinder 4.
  • the sheet transfer cylinder 15 adjoining the first printing cylinder 4 is equipped with three pliers-like grippers 23 arranged in the same angular distribution. In the sheet transfer cylinder direction of rotation, these pliers grippers 23 are adjacent to suction nozzles 24 which are pivotably mounted in the circumferential direction of the sheet transfer cylinder 15. The latter are seated on three segments S which are adjustably arranged in the circumferential direction of the sheet transfer cylinder 15 and which lie in recesses in the sheet transfer cylinder and whose back ends with the periphery of the sheet transfer cylinder.
  • the sheet transfer cylinder 15 in the vicinity of the pliers grippers then has three rows of additional grippers 25 arranged in the same circumferential distribution.
  • a sheet support 26 is arranged downstream of the sheet transfer cylinder 15.
  • the latter has a substantially flat-shaped and approximately tangential to the sheet transfer cylinder 15 support top 27.
  • the arrangement of the sheet support 26 lying in a horizontal plane is such that it is provided in the gusset Z between the sheet transfer cylinder 15 and the printing cylinder 5 following it below it.
  • the peripheral surface of the sheet transfer cylinder 15 projects beyond the end 28 of the sheet support 26 on the side of the sheet transfer cylinder and accordingly also forms a gusset 29 there.
  • the sheet support 26 is designed as a circumferential band 30.
  • Two end pulleys 31, 32 are used to guide the same. One or both of them can be driven such that the belt 30 transports in the conveying direction x, which direction corresponds to the direction of rotation y of the sheet transfer cylinder 15.
  • the transport speed of the belt 30 corresponds to the peripheral speed of the sheet transfer cylinder 15.
  • the support formed by the belt 30 Top 27 is curved in the direction of the pressure cylinder 5.
  • additional rollers not illustrated, can be provided. In cardboard processing combined with a certain stiffness of the sheet, only a corresponding guide plate would suffice as a sheet support.
  • suction nozzles 33 assigned to the sheet support band 30 are illustrated with arrows. However, it is also possible to provide the sheet support band 30 with a corresponding friction lining.
  • the contact point 34 between the first impression cylinder 4 and the sheet transfer cylinder 15 is followed by a blow air nozzle 35 designed in the form of an arcuate section. This blowing air nozzle is used when the sheets 13 are made of paper.
  • the downstream printing cylinder 5 is also equipped with two rows of clamping grippers 36 arranged in diametrically opposed positions.
  • the sheet-fed rotary printing press is set to face and back printing.
  • the sheet 13 transferred from the feed drum 14 to the impression cylinder 4 is captured on the sheet leading edge 13 'by a series of clamping grippers 22 and receives the first pressure on its front after a corresponding passage.
  • the sheet leading edge 13 ' comes into the region of a row of the additional grippers 25 of the sheet transfer cylinder 15, which come into the clamping position to the sheet leading edge 13'.
  • the sheet 13 is taken along by it in the direction of rotation y of the sheet transfer cylinder 15.
  • the corresponding suction nozzles 24 are now used and fix the trailing edge 13 ⁇ , see FIGS.
  • the trailing edge 13 ⁇ of the sheet is taken along by pivoting the suction nozzles 24 in the direction of rotation of the sheet transfer cylinder y.
  • the sheet 13 forms a loop 40 by upsetting, due to the fact that the sheet leading edge 13 'is held by the additional grippers 25.
  • the sheet rear edge 13 ⁇ of the sheet 13 reaches the area of the corresponding clamping grippers 36 of the second printing cylinder 5, which clamping grippers take over the sheet trailing edge 13 ⁇ from the pliers grippers 23.
  • This process can be seen from FIGS. 2 and 3. Since the sheet trailing edge 13 Bogen is not damaged or kinked, this can always be done without problems, so that the sheet 13 between the blanket cylinder 8 and the printing cylinder 5 receives the pressure on its rear side.
  • the pliers gripper is designated by the number 41. It has the inner gripper leg 42 and the outer gripper leg 43. The latter is found before passing the contact point 34 between the first impression cylinder 4 and the sheet transfer cylinder 15 in an open position sunk into the sheet transfer cylinder 15. The sheet trailing edge 13 Bogen is sucked in and held by the suction nozzles 44. Then the suction nozzles pivot against the direction of rotation of the sheet transfer cylinder from the position shown with solid lines by a small angle of rotation into the dot-dash position while tensioning and smoothing the sheet.
  • the gripper jaws 41 are also designed such that they perform a pivoting movement, as in the embodiment described above, in such a way that Forceps mouth 45 is always in the plane of the arch 13 when turning the same.
  • the surface of the sheet transfer cylinder 15 is rough and chrome-plated.
  • the other sheet transfer cylinder 16 can be designed to be equivalent. If necessary, this can also interact with a corresponding sheet support.

Landscapes

  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
EP88106461A 1987-05-21 1988-04-22 Machine à imprimer des feuilles en deux couleurs sur une face ou à retiration Expired - Lifetime EP0291721B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3717093 1987-05-21
DE19873717093 DE3717093A1 (de) 1987-05-21 1987-05-21 Bogen-rotationsdruckmaschine zur herstellung von einseitigem mehrfarbendruck oder schoen- und widerdruck

Publications (3)

Publication Number Publication Date
EP0291721A2 true EP0291721A2 (fr) 1988-11-23
EP0291721A3 EP0291721A3 (en) 1990-04-11
EP0291721B1 EP0291721B1 (fr) 1992-07-01

Family

ID=6328072

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106461A Expired - Lifetime EP0291721B1 (fr) 1987-05-21 1988-04-22 Machine à imprimer des feuilles en deux couleurs sur une face ou à retiration

Country Status (4)

Country Link
US (1) US4930414A (fr)
EP (1) EP0291721B1 (fr)
JP (1) JPS6477542A (fr)
DE (1) DE3717093A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1103375A2 (fr) * 1999-11-27 2001-05-30 Koenig & Bauer Aktiengesellschaft Machine à imprimer rotative à feuilles pour l'impression sélective sur une face ou à retiration
WO2008071305A1 (fr) 2006-12-14 2008-06-19 Carl Zeiss Smt Ag Optique d'éclairage et dispositif d'exposition par projection pour la microlithographie
EP2293261A1 (fr) * 2001-12-07 2011-03-09 Fracture Code Corporation ApS Méthode et appareil pour le marquage d'articles

Families Citing this family (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4036253C1 (fr) * 1990-11-14 1992-10-15 Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De
DE4218422C2 (de) * 1992-06-04 1994-04-28 Heidelberger Druckmasch Ag Bogen-Offsetrotationsdruckmaschine mit herausnehmbarem Eindruck- oder Veredelungswerk
DE4244499C2 (de) * 1992-12-30 1995-04-06 Heidelberger Druckmasch Ag Druckmaschine mit bogenführender Fläche
DE4315511B4 (de) * 1993-05-10 2004-09-02 Heidelberger Druckmaschinen Ag Sauggreifer für eine Bogenübergabetrommel
JP3074105B2 (ja) * 1993-05-13 2000-08-07 株式会社桜井グラフィックシステムズ 枚葉印刷機の枚葉紙反転機構
DE4336047A1 (de) * 1993-10-22 1995-04-27 Heidelberger Druckmasch Ag Rotations-Bogendruckmaschine für Schön- und Widerdruck mit einem als Speichertrommel wirksamen Druckzylinder doppelt großen Durchmessers
DE4424965C2 (de) * 1994-07-15 2000-05-04 Koenig & Bauer Ag Einrichtung zur Wendung von Bogen
DE9416106U1 (de) * 1994-10-06 1994-11-24 Heidelberger Druckmasch Ag Bogenleitblech für eine Wendeeinrichtung
DE4436955C2 (de) † 1994-10-15 1999-11-11 Roland Man Druckmasch Vorrichtung zum berührungslosen Bogentransport
EP0709218B1 (fr) * 1994-10-27 1998-12-09 Ferag AG Procédé et dispositif pour marquer des produits imprimés
DE19615730A1 (de) * 1996-04-20 1997-10-23 Heidelberger Druckmasch Ag Wendeeinrichtung für eine Druckmaschine, insbesondere eine Bogenrotations-Offsetdruckmaschine
US5660108A (en) * 1996-04-26 1997-08-26 Presstek, Inc. Modular digital printing press with linking perfecting assembly
DE19635389B4 (de) * 1996-08-31 2006-06-29 Koenig & Bauer Ag Vorrichtung zum Wenden von Bogen in einer Druckmaschine
US6089156A (en) * 1997-03-21 2000-07-18 Heidelberger Druckmaschinen Aktiengesellschaft Turning device for a printing press
DE19825469A1 (de) * 1997-10-24 1999-04-29 Heidelberger Druckmasch Ag Wendevorrichtung für Bogendruckmaschinen
DE19752680A1 (de) * 1997-11-28 1999-06-02 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zur Übergabe der Hinterkante eines Bogens in einer Wendeeinrichtung einer Bogenrotationsdruckmaschine
DE10011436A1 (de) * 1999-05-27 2000-11-30 Heidelberger Druckmasch Ag Vorrichtung zum Halten eines Bogens auf einem an der Wendung beteiligten Zylinder einer Bogen verarbeitenden Maschine
DE19933304A1 (de) * 1999-07-16 2001-01-25 Roland Man Druckmasch Anlegeeinheit für eine Bogenverarbeitungsmaschine
DE19949412A1 (de) * 1999-10-13 2001-04-19 Heidelberger Druckmasch Ag Einrichtung zum Wenden von Bogen in einer Bogenrotationsdruckmaschine
DE19949751A1 (de) * 1999-10-15 2001-04-19 Heidelberger Druckmasch Ag Modulares Druckmaschinensystem zum Bedrucken von Bogen
DE10047040A1 (de) * 1999-10-15 2001-04-19 Heidelberger Druckmasch Ag Modulares Druckmaschinensystem zum Bedrucken von Bogen
DE10033838A1 (de) * 2000-07-12 2002-01-24 Roland Man Druckmasch Einrichtung zur Bogenführung
DE10152875B4 (de) * 2000-11-21 2014-08-07 Heidelberger Druckmaschinen Ag Wendeeinrichtung mit Speicher für flächiges Material
DE10158467B4 (de) * 2000-12-21 2014-05-15 Heidelberger Druckmaschinen Ag Druckmaschine und Verfahren zum Bedrucken eines Bogens
DE10102080B4 (de) 2001-01-18 2014-03-06 Heidelberger Druckmaschinen Ag Einrichtung zur Wendung flächiger Exemplare in einer bogenverarbeitenden Rotationsdruckmaschine
US6739252B2 (en) * 2001-07-30 2004-05-25 Heidelberger Druckmaschinen Ag Method and apparatus for reversing sheet material in sheet-processing machines
DE10310690A1 (de) * 2002-04-12 2003-10-30 Heidelberger Druckmasch Ag Bogenführungseinrichtung in einer bogenverarbeitenden Maschine
DE10358171A1 (de) * 2003-12-12 2005-07-07 Heidelberger Druckmaschinen Ag Vorrichtung zum Fördern eines Bogens durch eine drucktechnische Maschine
JP4092302B2 (ja) * 2004-04-01 2008-05-28 ソニーケミカル＆インフォメーションデバイス株式会社 サクション装置
DE102004021643A1 (de) 2004-05-03 2005-12-01 Man Roland Druckmaschinen Ag Applikationsverfahren für eine Bestandteile eines elektronischen Schaltkreises innerhalb einer Druckmaschine
JP2006069209A (ja) * 2004-08-30 2006-03-16 Heidelberger Druckmas Ag 印刷技術的な機械を通ってシートを搬送する装置
CN1944048A (zh) * 2005-09-21 2007-04-11 海德堡印刷机械股份公司 用于输送页张的方法和用于执行该方法的装置
DE102007049643C5 (de) * 2006-11-06 2019-04-04 Heidelberger Druckmaschinen Ag Verfahren und Vorrichtung zum Wenden eines Bogens während des Förderns durch eine Druckmaschine
DE102015209691C5 (de) * 2014-06-18 2024-03-14 Koenig & Bauer Ag Wendevorrichtung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH108720A (fr) * 1924-01-16 1925-02-16 Francis Dausmann Charles Presse d'imprimerie.
FR1587960A (fr) * 1967-10-18 1970-04-03
FR2216116A1 (fr) * 1973-02-02 1974-08-30 Maschf Augsburg Nuernberg Ag
DE2625750A1 (de) * 1975-06-11 1976-12-23 Harris Corp Verfahren und vorrichtung zum wahlweisen wenden eines bogens in einer rotationsdruckmaschine
FR2318738A1 (fr) * 1975-07-24 1977-02-18 Cigardi Omc Sa Dispositif pour le renversement sequentiel des feuilles de papier sur les machines a imprimer " offset " a plusieurs couleurs
GB2124595A (en) * 1982-07-23 1984-02-22 Komori Printing Mach Impression cyclinder device of sheet-fed printing press with turn-over mechanism
EP0215248A2 (fr) * 1985-09-17 1987-03-25 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Dispositif de retournement des feuilles d'une machine à imprimer rotative

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DD81406A (fr) *
US2931647A (en) * 1956-01-20 1960-04-05 Papa Paolo Sheet reversing cylinder with blowing tubes for stop-cylinder printing machines
DD101336A1 (fr) * 1972-12-27 1973-11-12
US4165689A (en) * 1975-07-24 1979-08-28 Officine Meccaniche Cigardi S.P.A. Device for sequential overturning of sheets in multi-color offset printing machines
DE3426756C1 (de) * 1984-07-20 1985-11-07 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Bogen-Wendeeinrichtung fuer Bogenrotationsdruckmaschinen
JP2512850B2 (ja) * 1992-02-19 1996-07-03 川崎重工業株式会社 金型交換装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH108720A (fr) * 1924-01-16 1925-02-16 Francis Dausmann Charles Presse d'imprimerie.
FR1587960A (fr) * 1967-10-18 1970-04-03
FR2216116A1 (fr) * 1973-02-02 1974-08-30 Maschf Augsburg Nuernberg Ag
DE2625750A1 (de) * 1975-06-11 1976-12-23 Harris Corp Verfahren und vorrichtung zum wahlweisen wenden eines bogens in einer rotationsdruckmaschine
FR2318738A1 (fr) * 1975-07-24 1977-02-18 Cigardi Omc Sa Dispositif pour le renversement sequentiel des feuilles de papier sur les machines a imprimer " offset " a plusieurs couleurs
GB2124595A (en) * 1982-07-23 1984-02-22 Komori Printing Mach Impression cyclinder device of sheet-fed printing press with turn-over mechanism
EP0215248A2 (fr) * 1985-09-17 1987-03-25 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Dispositif de retournement des feuilles d'une machine à imprimer rotative

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1103375A2 (fr) * 1999-11-27 2001-05-30 Koenig & Bauer Aktiengesellschaft Machine à imprimer rotative à feuilles pour l'impression sélective sur une face ou à retiration
EP1103375A3 (fr) * 1999-11-27 2002-04-10 Koenig & Bauer Aktiengesellschaft Machine à imprimer rotative à feuilles pour l'impression sélective sur une face ou à retiration
EP2293261A1 (fr) * 2001-12-07 2011-03-09 Fracture Code Corporation ApS Méthode et appareil pour le marquage d'articles
WO2008071305A1 (fr) 2006-12-14 2008-06-19 Carl Zeiss Smt Ag Optique d'éclairage et dispositif d'exposition par projection pour la microlithographie

Also Published As

Publication number Publication date
US4930414A (en) 1990-06-05
DE3717093C2 (fr) 1989-12-28
EP0291721B1 (fr) 1992-07-01
EP0291721A3 (en) 1990-04-11
JPS6477542A (en) 1989-03-23
DE3717093A1 (de) 1988-12-08

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