EP0292492B1 - Appareil d'impression - Google Patents

Appareil d'impression Download PDF

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Publication number
EP0292492B1
EP0292492B1 EP19870901086 EP87901086A EP0292492B1 EP 0292492 B1 EP0292492 B1 EP 0292492B1 EP 19870901086 EP19870901086 EP 19870901086 EP 87901086 A EP87901086 A EP 87901086A EP 0292492 B1 EP0292492 B1 EP 0292492B1
Authority
EP
European Patent Office
Prior art keywords
cylinder
web
print
impression cylinder
printing
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
EP19870901086
Other languages
German (de)
English (en)
Other versions
EP0292492A1 (fr
Inventor
John Henry Morgan
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.)
Morgan John Henry
Original Assignee
Morgan John Henry
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Filing date
Publication date
Application filed by Morgan John Henry filed Critical Morgan John Henry
Publication of EP0292492A1 publication Critical patent/EP0292492A1/fr
Application granted granted Critical
Publication of EP0292492B1 publication Critical patent/EP0292492B1/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
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/44—Arrangements to accommodate interchangeable cylinders of different sizes to enable machine to print on areas of different sizes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2217/00—Printing machines of special types or for particular purposes
    • B41P2217/10—Printing machines of special types or for particular purposes characterised by their constructional features
    • B41P2217/11—Machines with modular units, i.e. with units exchangeable as a whole
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2217/00—Printing machines of special types or for particular purposes
    • B41P2217/10—Printing machines of special types or for particular purposes characterised by their constructional features
    • B41P2217/13—Machines with double or multiple printing units for "flying" printing plates exchange

Definitions

  • the invention relates to printing apparatus and it is particularly concerned with printing apparatus such as an offset lithographic printing apparatus, which utilises a cylinder for applying print to a web.
  • Known offset lithographic printing machines comprise a plate cylinder to which ink is applied by rollers, a blanket cylinder which transfers the print from the plate cylinder to a web, and an impression cylinder which presses the web against the blanket cylinder.
  • the blanket cylinder will have a circumference corresponding either to the total print length or to a print length which is exactly divisible into the circumferential length of the blanket cylinder. Where a customer requires a print length which will not divide exactly into the circumferential length of the blanket cylinder, it is necessary to change the cylinder and, hitherto, it has been proposed to mount the blanket cylinder and plate cylinder in a cartridge which can be withdrawn axially to one side of the web. By doing that, the plate and blanket cylinders can be changed or cleaned easily.
  • Such a machine is described in EP-A-0 095 423.
  • the impression cylinder of the second print tower has a circumferential length which can be divided exactly by the print length applied by the first print tower, no problems arise.
  • the impression cylinder circumference is not so divisible, what is known as "ghosting" can occur where a second but lighter image of the print applied to the first side of the web is applied again to that side by the impression cylinder of the second print tower. Therefore, where the plate and blanket cylinders are changed in an upstream print tower it will generally be necessary to change both the plate and blanket cylinders and the impression cylinder of the downstream tower in order to ensure that ghosting does not occur.
  • An object of the present invention is to provide printing apparatus which enables the impression cylinder across which the web passes to be replaced without having to break the web or remove the web from the machine.
  • printing apparatus comprising a first print tower having printing and impression cylinders for applying print to one side of a web, a second print tower having printing and impression cylinders for applying print to the reverse side of the web characterised in that the impression cylinder in the second print tower is movably mounted axially relative to the associated printing cylinder whereby, in use, where the printing cylinder in the first tower is changed to one which applies a print length not exactly divisible into the circumferential length of the impression cylinder of the first print tower, the impression cylinder in the second print tower is movable to a position offset from the web to enable it to be changed for one having a circumferential length into which the print length is exactly divisible.
  • An arrangement as set out in the immediately preceding paragraphs enables the impression cylinder in the second print tower to be moved to a position to one side of the web so that the impression cylinder can be changed without having to break the web or remove the web from the machine.
  • the impression cylinder is mounted on slide means whereby the impression cylinder can be slid to the offset position.
  • the impression cylinder is preferably mounted between spaced support means, e.g., side plates.
  • the impression cylinder may be rotatably mounted in journal bearings on the support means.
  • the support means may have surfaces which engage the aforesaid slide means. Such surfaces may comprise arcuate cut-outs which rest on the slide means and which may be slidable therealong.
  • Such surfaces may be arranged on lower edges of said support means.
  • the printing cylinder which is preferably a blanket cylinder co-operable with a plate cylinder, may be mounted between spaced further support means such as further side plates.
  • the further support means may be carried by mounting means which enables the printing cylinder to be moved axially to a position offset from the web.
  • the mounting means may be slidable on bearings and preferably takes the form of rails.
  • the impression cylinder and printing cylinder of the second print tower may be rotatably fast with meshing gear wheels which disengage each other when one of the cylinders is moved to its offset position.
  • the impression cylinder gear wheel is preferably arranged to transmit drive to the printing cylinder gear wheel.
  • the printing (i.e. the blanket) cylinder gear wheel preferably meshes with a gear wheel rotatably fast with the plate cylinder so as to drive the latter.
  • the impression cylinder gear wheel disengages a driving gear when the impression cylinder is moved to its offset position.
  • drive from a main drive input is transmitted to the impression cylinder of the second print tower through an adjustable idler gear.
  • the idler gear may be rotatably mounted on a movable arm to enable the position of the idler gear to be adjusted to mesh with respective gear wheels on impression cylinders of different sizes. In that way different sized impression cylinder gear wheels can easily be made to mesh with the idler gear, the latter preferably being in constant mesh with a drive gear.
  • the arm is pivotable about an axis of said drive gear.
  • Locking means such as a screw and locknut arrangement, may be provided for locking said arm in position once the idler gear and impression cylinder gear are in mesh.
  • the basic offset lithographic printing machine comprises a main frame or bed 10 carrying a supply of paper web 12 which passes between feed rollers 13 arranged upstream of a print tower 14.
  • the print tower contains the usual plate cylinder 15, blanket cylinder 16 and impression cylinder 17.
  • Ink is applied to the plate cylinder 15 by a roller system 18 and moisture is applied to the plate cylinder 15 by a moistening roller system 19 in known manner.
  • the printed web passes between take-up rollers 20 and is collected by a web take-up 22.
  • the impression cylinder as shown in Figs.3 and 4 is mounted between end plates 24 spaced apart by suitable bars 24a. (Fig.3).
  • the impression cylinder and side plate arrangement then constitutes a single cartridge 21 which is slidable on guide bars 25 mounted on main supporting plates 1 on a bed, so that the impression cylinder can be shifted to one side of the web W.
  • the plate and blanket cylinders 15,16 are also mounted in a single cartridge 26 on guide rails 27.
  • the Fig.3 arrangement is particularly useful where a machine is provided having more than one print tower as in Fig.5 the upstream print tower 30 being arranged to print on one side of the web W and the downstream print tower 31 being arranged to print on the reverse side of the web, the web being inverted at an inverting station 32 between the towers.
  • the impression cylinder 17 in the downstream tower 31 has a circumferential length which is exactly divisible by the print length applied by the upstream print tower.
  • Fig.5 shows the downstream print tower having an arrangement of cylinders in accordance with the invention.
  • the present invention avoids the need to remove the web when changing the impression cylinder 17 of the downstream print tower 31. Alsok the dual cartridge arrangement shown in Figs.3,4 and 5 enables the side plates to be less robust than in Fig.2 as they do not need to support three heavy cylinders. Therefore the Fig.3 arrangement is a less expensive proposition.
  • An alternative size impression cylinder is indicated in broken lines in Fig.3.
  • Fig.4 shown the way in which the guide rails 25,27 may extend beyond opposite sides of the web so that the blanket cylinder and plate cylinder cartridge 26 can be moved to the right as viewed in Fig.4 whilst the impression cylinder cartridge 21 can be moved to the left. In that way, balance is maintained if both sets of cylinders are shifted axially to clear the web at the same time.
  • Figs.6 to 8 show a preferred form of apparatus in accordance with the invention. Parts in Figs.6 to 8 which correspond to parts in Figs.1 to 5 carry the same eeference numerals.
  • the main supporting plates 1 are spaced apart as shown in Fig.7.
  • the right hand main plate 1 carries a gearbox 40 which receives drive from a drive input shaft 42 driven by a main motor (not shown).
  • the gear box 40 has an output shaft carrying a sprocket 43 from which drive is transmitted by a belt 45 to a sprocket 44 on a driving shaft 46.
  • the sprocket 44 also transmits drive to roller systems 18,19 of the type shown in Fig.1 by means of a toothed belt (not shown).
  • the driving shaft 46 is rotatably mounted in main bearings 47,48 on the main plates 1 and by an outer bearing 49 supported by mounting bars 50 (one only of which is shown) on the right hand main plate 1.
  • the driving shaft 46 is rotatably fast with a drive gear 52 which meshes with an idler gear 53 rotatbly mounted on bearings 54 on an arm 55.
  • the arm 55 is mounted for rotation on a bearing 56 on the driving shaft 46.
  • the arm carries an adjustment handle 58 and rotatable locking bar 57.
  • the handle includes a screw threaded shaft 59 which projects through an arcuate slot 60 in left hand main plate 1 and screws into a projection 62 on the arm 55.
  • the locking bar 57 has a boss 63 which is screw threaded on to the shaft 59 and acts as a lock-nut for the shaft 59. With the boss 63 in a non-locking condition, the handle 58 can be moved up or down in the slot 60 to turn the arm 55 about bearing 56 and cause the idler gear 53 to roll around the drive gear 52. Once in the desired position the locking bar 57 is turned to engage adjacent main plate 1 and lock the shaft 59 against that main plate.
  • the idler gear 53 is positioned to mesh with a gear wheel 64 rotatably fast with an impression cylinder 17.
  • a spacer 65 is positioned between the gear wheel 64 and the impression cylinder 17.
  • the impression cylinder is integral with mounting shafts 66 which are rotatable in bearings 67,68.
  • the bearings 67,68 are mounted in side plates 24 which are held spaced apart by suitable bars 24a.
  • the left hand side plate 24 in Fig.7 has two arms 69, the lower edge of each of which is formed with an arcuate cut-out 70.
  • the cut-outs 70 rest on the upper edges of respective guide rails 25 extending between and mounted rigidly on the main plates 1 (Fig.8).
  • the bearings 67,68 are mounted in an upward extension 61 of each side plates 24 and are tied together by bars 24a to form a one-piece unit or cartridge 21 which is slidable to the left the full line position shown in Fig.7 to the broken line position (shown in part only).
  • the impression cylinder 17 is positioned to one side of the web W and can therefore be changed without having to break the web or remove the web from the printing machine.
  • the gear wheel 64 disengages the idler gear 53 and the new impression cylinder will have a different size wheel 64.
  • the position of the latter is adjusted into mesh by turning arm 55 with handle 58 when the new impression cylinder is moved into the full line position in Fig.7.
  • the right hand side plate 24 (which has a similar profile to the left hand plate 24 as viewed in Fig.6) is formed with two dowel apertures 71 fitted with bushes 72.
  • the apertures 71 (one only of which is shown) receive dowels 73 on the right main plate 1 which ensure positive location of the impression cylinder cartridge 21 relative to the plate 1.
  • Similar dowels 73a are provided on the left main plate 1 for location in dowel-receiving apertures 72a in the left hand plate 24 for positive location. Once in the Fig.7 full line position, suitable locking means (not shown) is provided to hold the cartridge 21 in place.
  • Fig.8 shows the guide rails 25 in greater detail.
  • the left hand end of each rail 25 is formed with an axial screw-threaded bore 74 which receives a screw-threaded reduced diameter end 75 of an extension rail 76.
  • the extension rails 76 have the same outer diameter as the rails 25 and are fitted when it is desired to move the impression cylinder cartridge 21 to the left clear of the web W.
  • the arrangement shown in Fig.4 is very similar, the main guide rail being shown at 25 and the extension at 76.
  • the gear wheel 64 meshes with a gear wheel 75 rotatably fast with a blanket cylinder 16.
  • a spacer 76 is arranged between the gear wheel 75 and the blanket cylinder.
  • the blanket cylinder is rotatable on bearings 77 mounted on a shaft 78 supported by adjustment elements 88,89 on left and right hand upper side plates 80.
  • the gear wheel 75 meshes with a gear wheel 82 rotatably fast with a plate cylinder 15.
  • a spacer 83 is arranged between the gear wheel 82 and the plate cylinder 15.
  • the plate cylinder 15 has integral stub-shafts 84 which are mounted for rotation in bearings 85 supported through adjustable intermediate elements 86,87 by the upper side plates 80.
  • the blanket cylinder 16 can be urged downwards to apply presure to the web supported by the impression cylinder by adjustment elements 88,89 and the plate cylinder can be urged against the blanket cylinder by elements 86,87. Adjustment devices (not shown) are also provided for moving the impression cylinder 27 towards or away from the blanket cylinder.
  • the upper side plates 80,81 are bed together with bars 92 and along with the cylinders 15,16 form a cartridge 26 slidable to the left clear of the web W as shown in broken lines in Fig.7.
  • the upper end plates 80 have lower edges attached to mounting rails 27 which are mounted for sliding on rollers 93 on the main plates 1 (the rollers 93 having horizontal axes) and between rollers 94 having vertical axes.
  • a handle 100 is provided on one of the rails 27 for moving the cartridge 26 to one side.
  • the right hand end of each rail 27 is formed similarly to the left hand end of each rail 25 to enable extensions 95 to be screwed thereon before the cartridge is moved.
  • a dowel location system may be provided similar to the dowel 73 and aperture 71 arrangement for cartridge 26.
  • the cartridges 21,26 could be movable in opposite directions clear of the web.
  • rollers are rotated slightly by hand if necessary to ensure that the gears 53,64 (see also Fig.4) of the rollers slide into mesh.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

L'appareil ci-décrit comprend un cylindre porte-plaques (15), un cylindre porte-blanchets (16) et un cylindre d'impression (17). Une bande d'impression (W) passe entre le cylindre porte-blanchets et le cylindre d'impression, afin de permettre le transfert du motif d'impression sur la bande à imprimer, ledit transfert étant effectué par le cylindre porte-blanchets. Le cylindre porte-plaques (15) et le cylindre porte-blanchets (16) forment une cartouche d'une seule pièce se déplaçant axialement vers une position décalée par rapport à la bande à imprimer. Le cylindre d'impression (17) peut également se déplacer, de façon autonome par rapport aux autres cylindres, vers une position décalée par rapport à la bande à imprimer, ce qui permet le remplacement du cylindre d'impression sans risquer d'endommager la bande à imprimer et sans devoir retirer la bande d'impression de l'appareil.

Claims (9)

  1. Appareil d'impression comprenant une première tour d'impression (30) comprenant un cylindre de transfert et un cylindre de pression pour appliquer une impression sur un côté d'une feuille (W), une seconde tour d'impression (31) comprenant un cylindre de transfert et un cylindre de pression (16, 17) pour appliquer une impression sur l'autre côté de la feuille, appareil caractérisé en ce que le cylindre de pression (17) de la seconde tour d'impression (31) est monté de manière à pouvoir se déplacer axialement par rapport au cylindre de transfert (16) associé, de sorte que, lorsque le cylindre de transfert (16) de la première tour est remplacé, en cours d'utilisation, par un cylindre de transfert appliquant une longueur d'impression qui n'est pas exactement divisible en la longueur périphérique du cylindre de pression (17) de la première tour d'impression (30), le cylindre de pression (17) de la seconde tour d'impression (31) peut se déplacer pour venir dans une position décalée par rapport à la feuille (W) de manière à lui permettre d'être changé en un cylindre présentant une longueur périphérique en laquelle la longueur d'impression est exactement divisible.
  2. Appareil d'impression selon la revendication 1, caractérisé en ce que le cylindre de pression (17) est monté sur des moyens glissants (25), de sorte qu'on peut faire glisser ce cylindre de pression (17) pour l'amener dans la position décalée.
  3. Appareil d'impression selon l'une quelconque des revendications 1 et 2, caractérisé en ce que le cylindre de pression (17) est monté entre des moyens de support espacés (24).
  4. Appareil d'impression selon la revendication 3 dépendant de la revendication 2, caractérisé en ce que les moyens de support comportent des surfaces (70) s'engageant contre les moyens glissants.
  5. Appareil d'impression selon la revendication 4, caractérisé en ce que les surfaces (70) sont situées sur les bords inférieurs des moyens de support.
  6. Appareil d'impression selon l'une quelconque des revendications précédentes, caractérisé en ce que le cylindre de transfert (16) est monté entre d'autres moyens de support espacés (80).
  7. Appareil d'impression selon la revendication 6, caractérisé en ce que les autres moyens de support (80) sont portés par des moyens de monture (27) permettant de déplacer le cylindre de transfert (16) axialement pour l'amener dans une position décalée par rapport à la feuille (W).
  8. Appareil d'impression selon la revendication 7, caractérisé en ce que la monture (27) peut glisser sur des supports (93, 94).
  9. Appareil d'impression selon la revendication 98, caractérisé en ce que la feuille (W) passe par un poste d'inversion (32) entre les tours d'impression.
EP19870901086 1986-02-03 1987-02-03 Appareil d'impression Expired - Lifetime EP0292492B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8602561 1986-02-03
GB868602561A GB8602561D0 (en) 1986-02-03 1986-02-03 Printing apparatus

Publications (2)

Publication Number Publication Date
EP0292492A1 EP0292492A1 (fr) 1988-11-30
EP0292492B1 true EP0292492B1 (fr) 1993-06-23

Family

ID=10592411

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870901086 Expired - Lifetime EP0292492B1 (fr) 1986-02-03 1987-02-03 Appareil d'impression

Country Status (5)

Country Link
EP (1) EP0292492B1 (fr)
AU (1) AU599631B2 (fr)
DE (1) DE3786349T2 (fr)
GB (1) GB8602561D0 (fr)
WO (1) WO1987004665A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3712703A1 (de) * 1987-04-14 1988-11-03 Heidelberger Druckmasch Ag Bogenrotations-druckmaschinen fuer mehrfarbendruck
CH686355A5 (fr) * 1991-04-09 1996-03-15 Bobst Sa Machine d'impression rotative comprenant un cylindre amovible.
DE4305393C2 (de) * 1993-02-22 1996-07-18 Heidelberger Druckmasch Ag Rollen-Rotationsdruckmaschine mit Eindruckwerk für fliegenden Druckformwechsel
ES2118596T3 (es) * 1994-04-28 1998-09-16 Nilpeter As Un aparato de impresion que comprende al menos un modulo de impresion.
DE19543518B4 (de) * 1995-11-22 2006-03-30 Heidelberger Druckmaschinen Ag Vorrichtung zum Waschen von Zylindermantelflächen in Rotationsdruckmaschinen
DE19611559A1 (de) * 1996-03-23 1997-09-25 Koenig & Bauer Albert Ag Bogenverarbeitungsmaschine
DE29921185U1 (de) * 1999-12-03 2001-04-12 Web Tech Licensees B.V., Badhoevedorp Satellitendruckmaschine zum Bedrucken von Bogen und Bahnen
DE10302214B4 (de) * 2003-01-22 2006-04-20 Koenig & Bauer Ag Gestell für eine Druckmaschine
DE102005015046A1 (de) * 2005-03-31 2006-10-05 Gallus Ferd. Rüesch AG Farbauftragswalze für ein Offsetdruckwerk
BRPI0520488A2 (pt) * 2005-08-30 2009-08-25 Rotatek Sa cassete de cilindros para máquinas semi-rotativas inserìvel em unidades de impressão para ofsete
TWI718698B (zh) * 2018-10-29 2021-02-11 瑞士商巴柏斯特麥克斯合資公司 全像箔供給裝置以及燙金印刷機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB273471A (en) * 1926-06-16 1927-07-07 Arthur Richardson Timson Improvements in or relating to rotary printing machines
GB1434602A (en) * 1973-01-16 1976-05-05 Halley Sons Ltd James Rotary printing presses
FR2420426A1 (fr) * 1978-03-22 1979-10-19 Chambon Machines Imprimeuse rotative a plusieurs couleurs et a format variable
CA1155001A (fr) * 1979-03-15 1983-10-11 Frank M. Biggar, Iii Postes de poinconnement et d'impression rapidement interchangeables
FR2527519A1 (fr) * 1982-05-25 1983-12-02 Chambon Machines Appareil d'impression offset a format variable

Also Published As

Publication number Publication date
GB8602561D0 (en) 1986-03-12
AU599631B2 (en) 1990-07-26
AU6934887A (en) 1987-08-25
DE3786349D1 (de) 1993-07-29
EP0292492A1 (fr) 1988-11-30
WO1987004665A1 (fr) 1987-08-13
DE3786349T2 (de) 1994-02-17

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