EP0199520A2 - Presse d'impression en creux et sa méthode de fabrication - Google Patents

Presse d'impression en creux et sa méthode de fabrication Download PDF

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Publication number
EP0199520A2
EP0199520A2 EP86302754A EP86302754A EP0199520A2 EP 0199520 A2 EP0199520 A2 EP 0199520A2 EP 86302754 A EP86302754 A EP 86302754A EP 86302754 A EP86302754 A EP 86302754A EP 0199520 A2 EP0199520 A2 EP 0199520A2
Authority
EP
European Patent Office
Prior art keywords
ink
printing plate
plate
press
duct
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.)
Withdrawn
Application number
EP86302754A
Other languages
German (de)
English (en)
Other versions
EP0199520A3 (fr
Inventor
Douglas Cliffe Ledgard
James Cox
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.)
Observer Ltd
Vinters Ltd
Original Assignee
Observer Ltd
Vickers PLC
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
Priority claimed from GB858510049A external-priority patent/GB8510049D0/en
Priority claimed from GB858516034A external-priority patent/GB8516034D0/en
Application filed by Observer Ltd, Vickers PLC filed Critical Observer Ltd
Publication of EP0199520A2 publication Critical patent/EP0199520A2/fr
Publication of EP0199520A3 publication Critical patent/EP0199520A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/02—Magnetic devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/12—Devices for attaching printing elements or formes to supports for attaching flexible printing formes
    • B41F27/1281—Devices for attaching printing elements or formes to supports for attaching flexible printing formes details of the printing plate ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/061—Inking devices
    • B41F9/065—Using inking rails

Definitions

  • This invention relates to printing and is concerned with a printing press for effecting gravure printing.
  • a surface carrying a gravure printing image wherein the printing areas comprise a series of individual cells separated from one another by lands constituting the non-printing area.
  • ink is applied to the surface carrying the gravure printing image and the excess ink over and above that which enters the cells is removed by a doctor blade supported by the lands. Thereafter, the material to be printed is pressed against the inked image and ink is transferred from the cells onto the material.
  • the cells vary in size. Thus they may be of constant area and varying depth, of varying area and constant depth, or a combination of the two. Hence there are variations in the quantity of ink held in the cells and these quantity variations enable tonal reproductions to be obtained on the material being printed.
  • One form of conventional rotary letterpress printing machine for newspaper production includes a plate cylinder which carries a curved metal printing plate cast by stereotyping and including a relief image.
  • the plate cylinder carries a printing plate having a relief image formed by image-wise exposure and development of a photopolymerisable layer.
  • Such printing plates place a limitation on the quality of letterpress newspaper production, and they cannot match the quality achieved by gravure or web-offset printing. The reason for this is that, in printing, pictures are reproduced as a series of dots formed by a screen. Generally, the coarser the screen, the less detailed is the picture.
  • Conventional rotary letterpress machines are in the main restricted to a screen of 65 dots per linear inch.
  • Web-offset and gravure printing allows the use of more than 120 dots per linear inch.
  • a conventional rotary letterpress machine is limited to using a mainly oil based ink which is formulated so as to remain 'open' (i.e. non-drying) on the machine and, as a consequence, it does not dry completely on the newspaper. This is a source of constant complaint by readers of the newspaper.
  • conventional letterpress machines are expensive to operate because of their high energy requirements. This is due in part to the large roller trains which are required to ensure even ink application to the plate cylinder. Proposals have been made for replacing these ink trains with a single engraved drum and, while this does lower the power requirement and optimise the print quality / from the printing plates, the overall result is still inferior to gravure or offset systems.
  • Letterpress newspaper printing machines are extremely expensive and a press may have a working life of 25 years or more. Because of the high cost of re- equipping, newspaper production cannot economically take advantage of new printing technology.
  • a gravure printing press comprising:
  • the axially extending sealing member will generally be spaced from the cylindrical surface by as small a distance as possible so that the ink duct is, to all intents and purposes, substantially closed.
  • the gap between the sealing member and the cylindrical surface will be no more than 2.0 mm and is preferably less than 0.5 mm.
  • the inking unit may be a single unit extending along the entire axial length of the cylindrical surface and sealed at the ends of said surface so that it has a width corresponding to the maximum width of the material to be printed.
  • the press may include a plurality of narrower inking units closely arranged together side by side along the axial length of the cylindrical surface with each unit being individually sealed at its ends against the cylindrical surface. This enables the printing of a material narrower than the normal maximum width simply by shutting off the ink supply to the superfluous unit(s) or by removing the superfluous unit(s). In this way, the number of inking units to be used in a given case can be selected in dependence upon the width of the material being printed.
  • the inking units may be mounted on the printing press in such a way that they can be readily detached and be replaced by another inking unit containing ink of a different colour so that different colour printing across the full width of the material is readily facilitated.
  • these detachable inking units it is particularly preferred for these detachable inking units to be interchangeable, one with the other, along the axial length of the cylindrical surface to facilitate printing in different colours. Alternatively this can be achieved by feeding different coloured inks to the inking units without detaching and replacing the units.
  • the cylindrical surface carrying the gravure printing image may be in the form of a gravure cylinder.
  • a gravure cylinder Such may be produced by a photomechanical process in a conventional manner by exposing carbon tissue or other suitable radiation sensitive material to a gravure screen to provide the image to be printed. The material is hardened to a variable degree by the exposure depending upon the amount of light it receives. The exposed material is then transferred to the surface of a copper cylinder and developed so as to selectively remove the radiation sensitive material depending upon the degree to which this material has become hardened during the exposure step. Thereafter, the surface of the copper cylinder is etched to produce the desired cells.
  • the photomechanical resist constituted by the developed material is of differing hardness and thickness and the etchant, e.g.
  • aqueous ferric chloride breaks through the resist gradually, depending upon the amount of hardening and the thickness, and etches the surface of the cylinder. Those areas of the resist most exposed to light are the most resistant to etching. Thus the copper surface beneath the completely exposed areas, corresponding to the screen, does not etch at all and hence this part of the copper surface forms the lands for the doctor blade to run on. The remainder of the copper surface is etched out in inverse proportion to the amount of light received by the overlying resist and forms the cells of differing depth and/or size.
  • the surface carrying the gravure printing image may be constituted by a gravure printing plate which has been fixed to a plate cylinder.
  • Such plates may be produced from a radiation sensitive plate comprising a radiation sensitive material coated onto a suitable substrate such as a synthetic resin or a metal sheet.
  • the radiation sensitive material may be a photopolymer in which case the radiation sensitive plate may be produced from the photopolymer by moulding.
  • Any suitable photopolymer may be used and it is particularly preferred to use, as the photopolymer, photosensitive linear polyamides such as those disclosed in British patent specifications No.767,912, No.795,961, No.862,276 and No.875,378.
  • the photopolymer is image-wise exposed to a continuous tone positive and a half-tone screen and the light entering the photopolymer insolubilises it. In those areas which receive most light, there is substantially complete photo insolubilisation and in those areas which receive the least amount of light there remains the greatest proportion of non-photo insolubilised polymer. Thereafter the plate is developed by applying a solvent for the photosensitive polymer so that the remaining photosensitive areas are selectively washed away leaving the insolubilised areas. There is thus obtained a gravure image comprising cells of differing volumes which are capable of receiving different quantities of ink to produce tonal reproductions on printing.
  • a gravure printing plate In the case where a gravure printing plate is used, it will be detachably mounted on the plate cylinder by a locking means.
  • the locking means and the printing plate will preferably be adapted to provide for rapid attachment and detachment of said plate to and from said cylinder whilst providing a smooth and substantially uninterrupted surface for contact with the material to be printed.
  • the gravure printing plate is mounted on the plate cylinder conventionally used for the aforementioned stereotype or photopolymer relief plates.
  • a shim plate which encloses the cylinder and which is preferably formed in two or more sections, is interposed between the gravure printing plate and the plate cylinder to compensate for the difference in thickness between the conventional relief plate and the gravure plate.
  • the conventional plate cylinder may be replaced by another plate cylinder having a larger diameter so that when this other plate cylinder is carrying a thin gravure printing plate the overall diameter is the same as the overall diameter of the conventional plate cylinder when carrying a conventional stereotype or photopolymer relief printing plate. In this way, the difference in plate thickness can be compensated for without the need to use a shim plate.
  • the locking means may comprise a modified version of the mechanical plate locking arrangement used to secure the conventional cast stereotypes and photopolymer plates to a plate cylinder.
  • the locking.device may be incorporated into the shim plate.
  • the locking means comprises a printing plate supporting shim plate fitted with a plurality of magnetic inserts, and the backing element of the printing plate is made from magnetisable material such as sheet steel.
  • magnetic inserts may be provided in the surface of the plate cylinder itself. In either case, the length of the printing plate may be greater than the overall circumferential length of the plate cylinder, together with its shim plate if needed, and the ends of the printing plate are overlapped when it is fitted in position.
  • the plate cylinder, or shim plate if fitted, may be provided with an axial channel in its cylindrical surface having a depth substantially equal to the thickness of the printing plate into which a recessed portion at one end of the printing plate may be received so that when the two ends of the plate are overlapped, the circular profile of the plate cylinder is maintained.
  • a rapid-setting plastic filler material may be used to fill any gap left at the free end of the plate, this filler material being cut away when the plate is changed.
  • the arrangement whereby a printing press is converted to accept a gravure printing plate has in practice substantial advantages.
  • the use of a gravure plate produced by the photo-polymerisation process provides higher print quality than the conventional letterpress printing plates.
  • the proposed direct inking system eliminates the ink trains used in conventional systems and thereby substantially lowers the energy requirements.
  • the use of a gravure plate will more readily permit the use of water and emulsion-based inks that in turn provide rapid drying, reducing 'rub-off' of the ink and 'strike-through', (penetration of ink through the paper). Both ink mist and noise are substantially reduced, and the requirement for either ink column controls or engraved ink drums is eliminated.
  • the printing press shown in Figures to 4 comprises a pair of side frames 1 (one side frame only being shown) with a rigid cast iron stretcher 2 pivotally mounted between the two.
  • the press includes a printing unit comprising a plate cylinder 4 mounted for rotation about its cylindrical axis 5 in journals 3 carried by the side frames and an impression cylinder 29 similarly mounted for rotation in journals carried by the side frames and located so as to define, with the plate cylinder 4, a nip through which a web 28 of paper to be printed is passed.
  • Cylinders 4 and 29 carry gears 35 and 36 respectively which are meshed together.
  • the press includes a main drive motor 37 which rotates cylinders 4 and 29 via gears 38 and 39.
  • the press may include a plurality of such printing units (not shown) in which case they will all be driven by a suitable drive mechanism in conventional manner by the motor 37.
  • a printing plate 6 having a gravure printing image is wrapped around the plate cylinder 4 and fixed thereto.
  • the gravure printing image of the printing plate 6 was produced by exposing a photosensitive polyamide coating on a steel substrate to a continuous tone positive and to a half tone screen and then developing the exposed coating.
  • a plurality of inking units is included in the printing press to apply ink to the printing image. Two of these are denoted by references B and C ( Figure 2). Each printing unit is secured to the stretcher 2 by means of retaining plates 8 clamped to the stretcher 2 by bolts 9. Up to four such inking units are provided and they are mounted on the printing press side by side along the axial length of the plate cylinder 4 or, alternatively, one full width inking unit may be present.
  • Each inking unit comprises a body portion 10 carrying an axially extending sealing member in the form of a plastics baffle 11 arranged to fit in close proximity to but spaced from the cylindrical surface of the plate 6 and mounted normally with respect to the surface of the plate 6.
  • the body portion 10 also carries an axially extending doctor blade 12 which contacts the cylindrical surface of the plate 6.
  • This blade 12 is flexible and formed, for example, of steel and is displaceably mounted on the body portion 10 so that., it can be moved towards or away from the cylindrical surface of the printing plate 6 by suitably rotating threaded adjusting bolt 13.
  • the doctor blade 12 is shown contacting the cylindrical surface in the reverse angle position. However, in another embodiment, the doctor blade 12 may contact the cylindrical surface in a trailing position.
  • the body portion 10 also includes a protruding edge 14 extending along the width of the duct, the edge 14 being slightly spaced from the cylindrical surface of the plate 6.
  • the gap between the protruding edge 14 and the cylindrical surface of the plate 6 will be no more than 2.0 mm and preferably it is less than 0.5 mm.
  • the protruding edge 14 divides the ink duct into a first zone 15 and a second zone 16.
  • the body portion 10 incorporates an ink feed conduit 17 which terminates in an inlet port 18 in the first zone 15 of the ink duct between the baffle 11 and the protruding edge 14.
  • the inlet port 18 is positioned midway between the ends of the ink duct.
  • the body portion 10 also incorporates an ink discharge conduit 19 communicating with branch conduits 20 which terminate in outlet ports 21 located at each end of the second zone 16 of the ink duct. This arrangement enables ink to egress from the second zone 16 of the ink duct.
  • the free end of the ink feed conduit 17 terminates in a connector 31 whereby an ink feed pipe 26 (see Figure 3) may be detachably connected thereto so that ink can be fed to the duct from a reservoir 22 via a pump 23 and a filter 24.
  • the free end of the ink discharge conduit 19 terminates in a connector 32 whereby an ink discharge pipe 27 (see Figure 3) may be detachably connected thereto so that ink can be conducted back to the reservoir 22.
  • a valve 30 is incorporated in the ink discharge pipe 27.
  • ink which may be a quick drying ink containing water
  • ink feed pipe 26, conduit 17 and port 18 In use ink, which may be a quick drying ink containing water, is pumped from the reservoir 22 under pressure through the filter 24 and into the first zone 15 of the ink duct via ink feed pipe 26, conduit 17 and port 18.
  • the ink flows between the protruding edge 14 and the surface of the plate 6 and into the second zone 16 of the ink duct and thence returns via ports 21, conduits 20 and 19, and ink discharge pipe 27 back to the reservoir 22.
  • the plate cylinder 4 rotates in the direction indicated by the arrow, i.e. in the same direction as the ink flow.
  • the flow of ink through the constriction defined by the edge 14 causes a pressure rise in the second zone 16 and ensures that the cells of the gravure printing image of the printing plate 6 are de-aerated and filled with ink.
  • the pressure in this zone can be controlled by suitably adjusting the valve 30.
  • the baffle 11 prevents contaminants entering the duct and also confines the ink within the duct. Excess ink is removed from the image by the doctor blade 12 and is returned to the reservoir 22. Any unwanted ink escaping past the end of seals 7 of the units is removed by an auxiliary-scraper blade 25.
  • the ink remaining in the cells is transferred to the web 28 which passes between the plate cylinder 4 and the impression cylinder 29 so that the desired image is printed onto the web. Access to the plate cylinder 4, for example when fitting the printing plate 6, is facilitated by tripping the inking units away from the plate cylinder by pivoting the stretcher 2 about the side frames 1.
  • each inking unit is provided across the width of the printing press and the press is such that it can receive a web which has a width corresponding to four pages, each page being associated with one of the inking units. In this way, four pages can be printed simultaneously. If, however, it is desired to use a narrower web and print less than four pages simultaneously, the appropriate number of inking units can be taken out of service merely by having their pumps 23 switched off or by being removed altogether after slackening bolts 9. In this way, only the number of inking units appropriate to the width of the web being printed are used.
  • each inking unit may contain ink of a different colour so that, for example, four colours can be applied to a four page width web simultaneously.
  • the inking units are interchangeable so that they may readily be moved axially along the plate cylinder from one position to another as desired to facilitate printing in different colours. Printing in different colours can also be effected by disconnecting the ink feed and ink discharge pipes of a given inking unit and connecting the unit to ink feed and ink discharge pipes associated with a reservoir containing ink of a different colour.
  • the press is intended for printing newspapers and typically has been converted from a letterpress machine.
  • the printing plate and the plate cylinder are shown in more detail in Figure 4.
  • a printing plate supporting shim plate 115 is fitted semi-permanently to the plate cylinder 4 of the letterpress machine to compensate for the thinner gravure printing plate.
  • the shim plate incorporates magnetic inserts 117 around its periphery.
  • the printing plate 6 is fitted to the outer periphery of the shimmed plate cylinder.
  • the printing plate which is formed as a flat sheet, comprises a thin sheet steel substrate 119 coated with a printing layer 120 of a polyamide material.
  • the printing plate 6 is secured to the plate cylinder 4 by the magnetic inserts 117 and by a clamping device generally indicated at 125.
  • This clamping device comprises a longitudinally extending clamping head 126 which is wedged-shaped towards the axis of the plate cylinder 4 and which is radially displaceable in both directions by means of a drive device 128 accessible from one end of the plate cylinder 4.
  • Clamping head 126 is received in a corresponding longitudinally extending slot 130 formed in the periphery of plate cylinder 4.
  • Clamping head 126 extends over the full length of the plate cylinder 4, and a plurality of printing plates 6 may be secured side-by-side to the periphery of the plate cylinder.
  • Printing plate 6 originates as a thin, flat sheet having a length which is substantially identical to the circumference of plate cylinder 4.
  • the clamping head 126 is first displaced radially outwardly beyond the periphery of cylinder 4 by means of drive device 128.
  • the printing plate 6 is then formed into a circle and the free ends 136, 137 are tucked between the clamping head 126 and the inclined faces of slot 130.
  • the drive device 128 is then used to draw the clamping head radially inwardly into slot 130 to trap the free ends of the plate between the sides of the clamping head 126 and slot 130, thereby clamping plate 6 in position.
  • the clamping head 126 may be disposed radially inwardly of the outer printing surface of plate cylinder 4 and a corresponding blanket slot 146 on impression cylinder 29 ensures that printing does not take place in this area, which suitably corresponds to the margins in the finished newspaper. Releasing the plate is the reverse of this procedure, and it will be appreciated that the radial clamping device 125 enables rapid attachment and detachment of printing plate 6 to plate cylinder 4, enabling a printing plate to be changed rapidly during a printing run.
  • the clamping edges of the device 125 are interrupted e.g. dog-toothed, and the free ends of the printing plate are correspondingly profiled.
  • the letterpress machine is provided with a new larger plate cylinder fitted with magnetic inserts corresponding to inserts 117. In this way the difference in thickness between the conventional stereotype or photopolymer relief printing plates can be compensated for without the need to use a shim plate.
  • the press prior to conversion, is shown in Figure 5 where parts corresponding to parts of Figures 1 to.4 are denoted by like reference numerals. More particularly, the plate cylinder 4 mounted in side frames 1 is provided with a thick steroeotype or photopolymer letterpress printing plate and receives ink from ink source 22 by means of a train of ink rollers comprising a duct roller 42, rubber rollers 43, oscillating drums 44 and forme rollers 45.
  • the major components of the press such as the side frames 1, the impression cylinder 29, the press drive, and optionally the plate cylinder 4, are retained and that the ink train is removed and replaced by the inking unit in accordance with the present invention.
  • shims are fitted to compensate for the difference in thickness between the gravure plates used in accordance with the invention and the cast stereotype or photopolymer plates conventionally used and the clamping device conventionally used for securing the cast stereotype or photopolymer plates to the plate cylinder 4 is modified to receive the gravure plates for example as shown in Figure 4.
  • Such a conversion provides a gravure system suitable for a high-speed newspaper press with lower operational costs than a conventional letterpress system and at only a fraction of the replacement cost normally associated-with a change in printing technology.
  • Figures 6 and 7 illustrate an alternative arrangement for holding the printing plate 6 onto the plate cylinder 4.
  • parts corresponding to parts of Figures 1 to 4 are denoted by like reference numerals.
  • the arrangement shown in Figures 6 and 7 may be applied to a converted letterpress printing press, or to a new press designed specifically for this application.
  • two semicircular printing plate supporting shim plates 152 and 153 are locked to the outer surface 155 of the plate cylinder.
  • the shim plates 152 and 153 are provided at intervals with magnetic inserts 158.
  • Nose 159 of shim plate 153 is formed with an end surface 160 of reduced diameter compared with the remainder of the plate.
  • This stepped portion 160 forms a shallow channel 162 extending in shim plate 153 in an axial direction and having a depth which is substantially equal to the thickness of printing plate 6.
  • the printing plate 6 comprises steel substrate 119 and polyamide printing layer 120.
  • the steel substrate is approximately 0.010 inches (0. 024 mm) thick and thus the plate is very thin and flexible.
  • the plate Prior to applying the plate to curved outer surface 167 of shim plates 152 and 153, the plate is provided with a gravure image in the manner previously described and is then cut to a length which is slightly longer than the circumference of the shim plates.
  • a first end 165 of plate 6 is bent inwardly to form a recessed portion conforming to the profile of channel 162 in shim plate 153 and also to conform with the angular leading edge of nose 159.
  • the plate is then fitted onto the plate cylinder 4 by rotating the cylinder and feeding the plate into the nip formed between the cylinder 4 and an ironing roller 168.
  • Ironing roller 168 is pre-loaded to press plate 6 onto surface 164 and, as plate 6 becomes attached to surface 164 by the magnetic inserts 158, rotation of the ironing roller 168 and plate cylinder 4 presses the plate against the cylinder and ensures the plate is lying absolutely uniformly on the surface 167 with the free second end 170 of plate 6 overlapping the end 165 and lying in the recessed portion as shown in order to maintain the correct circular shape for cylinder 4.
  • a small gap is left between end 170 of the printing plate 6 and the portion of end 165 adjacent the recessed portion and this gap is then filled with an adhesive filler material 172 which can be a heat or UV-settable plastics material or any other suitable rapidly-setting mastic which is applied either in liquid, semi-solid, or solid form.
  • the surface of the filler material 172 can be smoothed with a smoothing tool which may itself be heated to assist in the setting process.
  • the overlapping ends of the printing plate provide a tolerance for the length of the printing plate and mean that the adhesive setting material 172 does not touch the outer surface of shim plates 152 and 153, and that the material may be cut open when the plate is removed without damage to the shim plate or to the cylinder.
  • the use of a stepped portion 160 which is substantially the same depth as the printing plate thickness ensures that the outer surface of plate cylinder 4 is smooth and substantially uninterrupted. This is an essential requirement for gravure printing where a doctor blade is applied against the printing plate.
  • the bent-over end of the printing plate around nose 159 assists in maintaining the plate in exact register with cylinder 4.
  • the plate cylinder will have a larger diameter to compensate for the thinner gravure printing plates without the need to use shim plates.
  • the plate cylinder will include magnetic inserts corresponding to inserts 158 and will be provided with an axial channel corresponding to channel 162.
  • the plate 6 is a gravure printing plate including a gravure printing image formed in a photopolymer layer coated onto a thin steel sheet substrate.
  • the plate cylinder 4' has a larger diameter than the plate cylinder used for letterpress printing and thus shim plates are not needed to compensate for the thinner gravure plate.
  • the cylinder includes an axially extending surface slot 50 including a pair of register pins 51. Also located in the slot are magnets 52 which have end surfaces 53 which terminate below the periphery of the plate cylinder 4' so as to form a shallow channel extending axially of the plate cylinder 4'. This channel has a depth which is substantially equal to the thickness of printing plate 6.
  • the surface of the plate cylinder 4' is provided with magnetic inserts 54 at intervals.
  • the first end 165 of the printing plate 6 includes a pair of register holes corresponding to the register pins 51 and is bent inwardly to form a recessed portion conforming to the profile of the channel defined by end surfaces 53.
  • the plate is affixed to the plate cylinder by engaging the register pins 51 in the register holes and rotating the plate cylinder 4' so as to feed the plate 6 into the nip between the plate cylinder 4' and an ironing roller as in the case of Figures 6 and 7. In this way, the plate becomes attached to the plate cylinder 4' by the magnetic inserts 54 and the free second end 170 of the plate 6 overlaps the end 165 and lies in the recessed portion.
  • an adhesive filler material is introduced into the small gap between the end 170 of the printing plate 6 and the portion of end 165 adjacent to the recessed portion.
  • the register pins 51 ensure that a series of identical printing plates can be secured in succession to the plate cylinder in exactly the same position. Moreover the mounting arrangement is such that the plate cylinder can be rotated in either the normal direction or the reverse direction.
  • the printing plate 6 may have a length slightly greater than the circumference of the plate cylinder 4' as described.
  • the plate cylinder can include two such surface slots 50 diametrically opposed to each other whereby a pair of plates having a length slightly greater than one half of the circumference of plate cylinder 4' may be fitted.
  • the slot(s) 50 will include a pair of register pins 51 for each page width.
  • press of the present invention may be a completely new press which has not been produced by converting an existing press and that the press of the present invention may be used for printing purposes other than for newspaper production.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Methods (AREA)
EP86302754A 1985-04-19 1986-04-14 Presse d'impression en creux et sa méthode de fabrication Withdrawn EP0199520A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB858510049A GB8510049D0 (en) 1985-04-19 1985-04-19 Printing press
GB8510049 1985-04-19
GB8516034 1985-06-25
GB858516034A GB8516034D0 (en) 1985-06-25 1985-06-25 Printing

Publications (2)

Publication Number Publication Date
EP0199520A2 true EP0199520A2 (fr) 1986-10-29
EP0199520A3 EP0199520A3 (fr) 1989-02-08

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EP86302754A Withdrawn EP0199520A3 (fr) 1985-04-19 1986-04-14 Presse d'impression en creux et sa méthode de fabrication

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0286305A2 (fr) * 1987-04-08 1988-10-12 Seiken Graphics, Inc. Impression lithographique
EP0294022A1 (fr) * 1987-05-11 1988-12-07 Vickers Plc Imprimerie
EP0306986A2 (fr) * 1987-09-11 1989-03-15 OFFICINE MECCANICHE GIOVANNI CERUTTI S.p.A. Plaque à imprimer pour l'impression rotative
EP0324141A2 (fr) * 1988-01-09 1989-07-19 Albert-Frankenthal AG Dispositif d'encrage
DE3823340C1 (fr) * 1988-07-09 1990-01-04 Fischer & Krecke Gmbh & Co, 4800 Bielefeld, De
EP0355609A2 (fr) * 1988-08-23 1990-02-28 Mitsubishi Jukogyo Kabushiki Kaisha Imprimerie sans clés
EP0368485A2 (fr) * 1988-10-31 1990-05-16 Seiken Graphics, Inc. Impression lithographique
EP0278225A3 (en) * 1987-02-12 1990-05-23 Albert-Frankenthal Ag Short-inking device
FR2676963A1 (fr) * 1991-05-28 1992-12-04 Koenig & Bauer Ag Racle pour un groupe encreur de machine a imprimer rotative.
FR2690382A1 (fr) * 1992-04-25 1993-10-29 Koenig & Bauer Ag Porte-racle pour un groupe d'impression à encre courte.
FR2690381A1 (fr) * 1992-04-25 1993-10-29 Koenig & Bauer Ag Porte-racle.
EP0783963A1 (fr) * 1996-01-10 1997-07-16 POLYWEST KUNSTSTOFFTECHNIK Saueressig & Partner GmbH & Co. KG Racle d'encre à chambre pour un élément destiné au transfert d'encre
WO1997040986A1 (fr) * 1996-04-26 1997-11-06 Heidelberger Druckmaschinen Ag Cylindre porte-plaque dote d'un dispositif tendeur fixe de montage de plaque
DE102005061916A1 (de) * 2005-12-23 2007-07-12 Koenig & Bauer Aktiengesellschaft Druckmaschine mit einem eine Rakeleinrichtung enthaltenden Farbwerk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR460755A (fr) * 1913-07-25 1913-12-11 Georges Crete Perfectionnements apportés au mode d'encrage des machines rotatives ou non rotatives dites roto-taille-douce
GB2032852A (en) * 1978-10-19 1980-05-14 Polygraph Leipzig Inking apparatus
FR2477969A1 (fr) * 1980-03-11 1981-09-18 Wifag Maschf Encrier amovible

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FR460755A (fr) * 1913-07-25 1913-12-11 Georges Crete Perfectionnements apportés au mode d'encrage des machines rotatives ou non rotatives dites roto-taille-douce
GB2032852A (en) * 1978-10-19 1980-05-14 Polygraph Leipzig Inking apparatus
FR2477969A1 (fr) * 1980-03-11 1981-09-18 Wifag Maschf Encrier amovible

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0278225A3 (en) * 1987-02-12 1990-05-23 Albert-Frankenthal Ag Short-inking device
EP0458371A1 (fr) * 1987-02-12 1991-11-27 Albert-Frankenthal AG Dispositif d'encrage court
EP0286305A3 (fr) * 1987-04-08 1990-01-17 Seiken Graphics, Inc. Impression lithographique
US5031529A (en) * 1987-04-08 1991-07-16 Vickers Plc Inking system for lithographic printing
EP0286305A2 (fr) * 1987-04-08 1988-10-12 Seiken Graphics, Inc. Impression lithographique
EP0294022A1 (fr) * 1987-05-11 1988-12-07 Vickers Plc Imprimerie
EP0306986A3 (en) * 1987-09-11 1989-11-15 Officine Meccaniche Giovanni Cerutti S.P.A. Method for joining the ends of a printing plate for rotary printing, and the printing plate so realised
EP0306986A2 (fr) * 1987-09-11 1989-03-15 OFFICINE MECCANICHE GIOVANNI CERUTTI S.p.A. Plaque à imprimer pour l'impression rotative
EP0324141A2 (fr) * 1988-01-09 1989-07-19 Albert-Frankenthal AG Dispositif d'encrage
EP0324141A3 (en) * 1988-01-09 1990-08-22 Albert-Frankenthal Ag Inking unit
DE3823340C1 (fr) * 1988-07-09 1990-01-04 Fischer & Krecke Gmbh & Co, 4800 Bielefeld, De
EP0350839A2 (fr) * 1988-07-09 1990-01-17 Fischer & Krecke Gmbh & Co. Système d'encrage pour encres d'impression dans des groupes d'impression rotatifs
EP0350839A3 (fr) * 1988-07-09 1990-12-27 Fischer & Krecke Gmbh & Co. Système d'encrage pour encres d'impression dans des groupes d'impression rotatifs
EP0355609A2 (fr) * 1988-08-23 1990-02-28 Mitsubishi Jukogyo Kabushiki Kaisha Imprimerie sans clés
US5007341A (en) * 1988-08-23 1991-04-16 Mitsubishi Jukogyo Kabushiki Kaisha Keyless printing press
EP0355609A3 (en) * 1988-08-23 1990-07-25 Mitsubishi Heavy Ind Ltd Keyless printing press
EP0368485A3 (fr) * 1988-10-31 1991-01-30 Seiken Graphics, Inc. Impression lithographique
US5054392A (en) * 1988-10-31 1991-10-08 Vickers Plc Lithographic printing press having an ink duct with a divided chamber
EP0368485A2 (fr) * 1988-10-31 1990-05-16 Seiken Graphics, Inc. Impression lithographique
FR2676963A1 (fr) * 1991-05-28 1992-12-04 Koenig & Bauer Ag Racle pour un groupe encreur de machine a imprimer rotative.
US5272976A (en) * 1991-05-28 1993-12-28 Koenig & Bauer Aktiengesellschaft Doctor blade
FR2690382A1 (fr) * 1992-04-25 1993-10-29 Koenig & Bauer Ag Porte-racle pour un groupe d'impression à encre courte.
FR2690381A1 (fr) * 1992-04-25 1993-10-29 Koenig & Bauer Ag Porte-racle.
EP0783963A1 (fr) * 1996-01-10 1997-07-16 POLYWEST KUNSTSTOFFTECHNIK Saueressig & Partner GmbH & Co. KG Racle d'encre à chambre pour un élément destiné au transfert d'encre
WO1997040986A1 (fr) * 1996-04-26 1997-11-06 Heidelberger Druckmaschinen Ag Cylindre porte-plaque dote d'un dispositif tendeur fixe de montage de plaque
DE102005061916A1 (de) * 2005-12-23 2007-07-12 Koenig & Bauer Aktiengesellschaft Druckmaschine mit einem eine Rakeleinrichtung enthaltenden Farbwerk

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