EP0292492A1 - Printing apparatus. - Google Patents
Printing apparatus.Info
- Publication number
- EP0292492A1 EP0292492A1 EP19870901086 EP87901086A EP0292492A1 EP 0292492 A1 EP0292492 A1 EP 0292492A1 EP 19870901086 EP19870901086 EP 19870901086 EP 87901086 A EP87901086 A EP 87901086A EP 0292492 A1 EP0292492 A1 EP 0292492A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- printing apparatus
- printing
- web
- 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
Links
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.
- 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 downsteam tower in order to ensure that ghosting does not occur.
- An object of the present invention is to provide printing apparatus which enables at least 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 printing cylinder for applying print to a web and an impression cylinder for maintaining the web against the printing cylinder, said printing cylinder being movable axially to a position offset from the web, said impresssion cylinder being movable axially independently of the printing cylinder to a position offset from the web.
- printing apparatus comprising ⁇ printing cylinder for applying print to a web and an impression cylinder for maintaining the web against the printing cylinder, said impression cylinder being movable axially relative to the printing cylinder to a position offset from the web .
- An arrangement as set out in either of the two immediately preceding paragraphs enables the impression cylinder 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 printing and impression cylinders are arranged in a print tower of a printing machine downstream of a further print tower of the machine.
- the further print tower applies print, in use, to one side of the web and the downstream print tower applies print to the opposite side of the web , the web moving through an inverting station between the print towers.
- the impression cylinder and printing cylinder 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 through an adjustable roller 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 theidler 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.
- Fig.1 is a diagrammatic elevation of basic offset lithographic printing machine
- Fig.2 is a diagrammatic elevation of a known type of plate blanket and impression cylinder arrangement
- Fig.2a is a view of the arrangement of Fig.2 looking in the direction of arrow II in Fig.2,
- Fig.3 is a diagrammatic elevation of a cylinder arrangement of an offset lithographic printing apparatus in accordance with the invention
- Fig.4 is a view of the cylinder arrangement of Fig.3 looking in the direction of arrow IV in Fig.3,
- Fig.5 is a diagrammatic elevation of an offset lithographicprinting machine having two print towers one of which includes apparatus in accordance with the invention.
- Fig.6 is an elevation of a preferred form of printing apparatus in accordance with the invention.
- Fig.7 is a cross section of the apparatus in Fig.6 on the line VII-VII in Fig.6, and
- Fig.8 is a cross section of the apparatus in Fig.6 on the line VIII-VIII in Fig.6.
- 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 s l i d a b l e 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.
- 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 shows 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 r e f e r en c e 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.
- 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
- 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 lin> 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 (Fig.6) are provided on the left main plate 1 for location in dowel-receiving apertures 72a in the left hand plate 24 for positive location.
- 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 arrange between the gear wheel 75 and the blanket cylinder.
- the blanket cylinder is rotatable on bearings 77 mounte 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.
Landscapes
- 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.The apparatus described below comprises a plate cylinder (15), a blanket cylinder (16) and a printing cylinder (17). A printing strip (W) passes between the blanket cylinder and the printing cylinder, in order to allow the transfer of the printing pattern on the strip to be printed, said transfer being effected by the blanket cylinder. The plate cylinder (15) and the blanket cylinder (16) form a one-piece cartridge moving axially to a position offset from the web to be printed. The printing cylinder (17) can also move, independently with respect to the other cylinders, to a position offset with respect to the tape to be printed, which allows the replacement of the printing cylinder without risk of damaging the print tape and without having to remove the print tape from the machine.
Description
Claims
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 true EP0292492A1 (en) | 1988-11-30 |
EP0292492B1 EP0292492B1 (en) | 1993-06-23 |
Family
ID=10592411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870901086 Expired - Lifetime EP0292492B1 (en) | 1986-02-03 | 1987-02-03 | Printing apparatus |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0292492B1 (en) |
AU (1) | AU599631B2 (en) |
DE (1) | DE3786349T2 (en) |
GB (1) | GB8602561D0 (en) |
WO (1) | WO1987004665A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3712703A1 (en) * | 1987-04-14 | 1988-11-03 | Heidelberger Druckmasch Ag | ARCH ROTATION PRINTING MACHINES FOR MULTICOLOR PRINTING |
CH686355A5 (en) * | 1991-04-09 | 1996-03-15 | Bobst Sa | Rotary printing machine comprising a removable cylinder. |
DE4305393C2 (en) * | 1993-02-22 | 1996-07-18 | Heidelberger Druckmasch Ag | Web-fed rotary printing machine with impression mechanism for flying printing plate changes |
ES2118596T3 (en) * | 1994-04-28 | 1998-09-16 | Nilpeter As | A PRINTING DEVICE THAT INCLUDES AT LEAST ONE PRINTING MODULE. |
DE19543518B4 (en) * | 1995-11-22 | 2006-03-30 | Heidelberger Druckmaschinen Ag | Apparatus for washing cylinder jacket surfaces in rotary printing machines |
DE19611559A1 (en) * | 1996-03-23 | 1997-09-25 | Koenig & Bauer Albert Ag | Sheet processing machine |
DE29921185U1 (en) * | 1999-12-03 | 2001-04-12 | Web Tech Licensees B.V., Badhoevedorp | Satellite printing machine for printing on sheets and webs |
DE10302214B4 (en) * | 2003-01-22 | 2006-04-20 | Koenig & Bauer Ag | Rack for a printing press |
DE102005015046A1 (en) * | 2005-03-31 | 2006-10-05 | Gallus Ferd. Rüesch AG | Ink applicator roll for an offset printing unit |
BRPI0520488A2 (en) * | 2005-08-30 | 2009-08-25 | Rotatek Sa | semi-rotating machine drum cassette insertable into offset printing units |
TWI718698B (en) | 2018-10-29 | 2021-02-11 | 瑞士商巴柏斯特麥克斯合資公司 | Holographic foil supplying device as well as hot foil stamping machine |
Family Cites Families (5)
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 (en) * | 1978-03-22 | 1979-10-19 | Chambon Machines | Variable format as multicolour printer - has counter rollers mounted in adjustable frame to tangentially contact blanket rollers |
CA1155001A (en) * | 1979-03-15 | 1983-10-11 | Frank M. Biggar, Iii | Rapid changeover die and print stations |
FR2527519A1 (en) * | 1982-05-25 | 1983-12-02 | Chambon Machines | OFFSET PRINTING APPARATUS WITH VARIABLE FORMAT |
-
1986
- 1986-02-03 GB GB868602561A patent/GB8602561D0/en active Pending
-
1987
- 1987-02-03 DE DE19873786349 patent/DE3786349T2/en not_active Expired - Fee Related
- 1987-02-03 EP EP19870901086 patent/EP0292492B1/en not_active Expired - Lifetime
- 1987-02-03 AU AU69348/87A patent/AU599631B2/en not_active Ceased
- 1987-02-03 WO PCT/GB1987/000077 patent/WO1987004665A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO8704665A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU6934887A (en) | 1987-08-25 |
WO1987004665A1 (en) | 1987-08-13 |
EP0292492B1 (en) | 1993-06-23 |
DE3786349T2 (en) | 1994-02-17 |
GB8602561D0 (en) | 1986-03-12 |
AU599631B2 (en) | 1990-07-26 |
DE3786349D1 (en) | 1993-07-29 |
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