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EP0512549B2 - Presse à imprimer - Google Patents
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EP0512549B2 - Presse à imprimer - Google Patents

Presse à imprimer Download PDF

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Publication number
EP0512549B2
EP0512549B2 EP19920107737 EP92107737A EP0512549B2 EP 0512549 B2 EP0512549 B2 EP 0512549B2 EP 19920107737 EP19920107737 EP 19920107737 EP 92107737 A EP92107737 A EP 92107737A EP 0512549 B2 EP0512549 B2 EP 0512549B2
Authority
EP
European Patent Office
Prior art keywords
plate
cylinder
press
printing
printing press
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
EP19920107737
Other languages
German (de)
English (en)
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EP0512549A1 (fr
EP0512549B1 (fr
Inventor
Mutsumi C/O Fuji Photo Film Co. Ltd. Naniwa
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26446118&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0512549(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from JP3105898A external-priority patent/JP2737811B2/ja
Priority claimed from JP16956191A external-priority patent/JPH0516324A/ja
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Publication of EP0512549A1 publication Critical patent/EP0512549A1/fr
Application granted granted Critical
Publication of EP0512549B1 publication Critical patent/EP0512549B1/fr
Publication of EP0512549B2 publication Critical patent/EP0512549B2/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F30/00—Devices for attaching coverings or make-ready devices; Guiding devices for coverings
    • B41F30/06—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching of endless or like continuously-fed coverings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1075—Mechanical aspects of on-press plate preparation

Definitions

  • the rotary press as described above comprises a feeder, an ink supplier, a pressure applicator and a delivery and, in case of a lithographic press, a dampening water supplier is also provided. While many cylinders and rolls are needed, a sheet feeding type multicolor printing press in which inks of more than one color are printed in superposition on a single sheet is worth particular mention since even the pressure applicator taken alone needs many cylinders. For example, in case of direct printing in four colors, four plate cylinders, four impression cylinders and at least three transfer cylinders are necessary, which means a total of eleven cylinders are needed at minimum. In case of an offset press, four rubber-covered blanket cylinders are additionally required.
  • FIG. 13 A prior art rotary four-color sheet feeding lithographic offset press in common use is illustrated in Fig. 13.
  • the press generally indicated by 100 comprises four sets of plate cylinders 102, blanket cylinders 104, impression cylinders 106 and transfer cylinders 108, each set being assigned to either one of four colors, yellow (Y), magenta (M), cyan (C) and black (B). Thus, a total of 16 cylinders are used in the press.
  • Shown by 110 is a dampening water supplier
  • 112 is an ink supplier
  • 114 is a feeder
  • 116 is a delivery.
  • Direct platemaking is also implemented today, in which process the image data read from an original document or a block copy or the image data composed with a computer or an image processor is processed and the images of respective colors are digitally exposed on the original plate under laser light or the like, followed by development and any other subsequent treatments to make a press plate.
  • the making of press plates has been effected for each of the colors to be printed by a separate platemaking process; namely, the platemaking process has been entirely independent of the printing process.
  • the platemaking equipment is entirely dependent of the printing press and the overall process which starts with the platemaking and involves printing to yield printed matter cannot be simplified.
  • Another problem with the prior art has been that the platemaking process is in itself time-consuming since it has to be performed for each of the colors to be reproduced.
  • the present invention has been accomplished under these circumstances and its object is to provide a multicolor printing press that is easy to operate in that it enables a plurality of press plates to be prepared simultaneously even in the case of multicolor printing, thereby shortening the process time including platemaking and printing operations, that is simple enough in construction to realize a compact and small-sized system, and that permits printing to be done at comparatively high speed.
  • said platemaking units and said ink supply assembly are both movable in a direction parallel to the central axis of said plate cylinder so that they are alternately located in the same position over said plate cylinder.
  • said drawing section is composed of a laser exposing unit.
  • said printing press further includes an ink transfer blanket cylinder between said plate cylinder and said impression cylinder.
  • said printing press uses a lithographic plate as said press plate, and further includes a dampening water supply assembly for supplying dampening water to said press plate.
  • the printing press of the present invention is described hereinafter in greater detail. To begin with , we describe a printing press having a single plate cylinder and a single plate making unit which is not part of the invention.
  • a plurality of ink supply units for the respective colors that are provided around the plate cylinder will successively supply inks of those colors, with each ink being deposited only at the time when the image of the corresponding color (or the press plate carrying that image) on the plate cylinder has come to the right position.
  • dampening water may be supplied to the plates, as required, by means of dampening water supply units before the inks are supplied.
  • the impression cylinder that contacts the plate cylinder either directly or via a rubber-covered blanket cylinder, that has a diameter one-nth of that of the plate cylinder and that holds a single sheet of printing paper wrapped around it rotates in forward direction at the same peripheral speed as the surface of the press plate on the plate cylinder; when the impression cylinder rotates fully once, the ink image of one color on a press plate on the plate cylinder is transferred onto the printing paper either directly or after it is transferred to the intermediate blanket cylinder.
  • the impression cylinder has made n revolutions as it holds the printing paper
  • the plate cylinder rotates fully once and by repeating the transfer step n times, n colors are printed on the paper.
  • the impression cylinder releases the paper on which n colors have been printed and holds a freshly supplied sheet of printing paper so that it is subjected to another printing cycle.
  • Such a printing press is simple in construction and compact enough to realize a small-sized system; further, it does not require registration even in multicolor printing, can be easily operated even by unskilled operators and enables printing to be done at comparatively high speed.
  • the printing press is applicable to various types of press plates whether they are for letterpress, intaglio or lithography (either in the presence or absence of dampening water); at the same time, it is applicable to both direct printing and offset printing.
  • Fig. 2 is a cross-sectional view showing schematically an embodiment of a printing press.
  • the printing press generally indicated by 10 is a direct-process rotary sheet feeding four-color lithographic offset press that uses dampening water and which comprises the following components: a single plate cylinder 12 around which press plates 28 (exposed) for four colors can be formed at given intervals; a platemaking unit 14 positioned around and near the plate cylinder 12; an ink supply assembly 16 for four colors B, C, M and Y; a rubber-covered blanket cylinder 18 onto which ink images are to be transferred from the press plates 28; a dampening water supply assembly 20 for four colors; an impression cylinder 22 whose diameter is one-fourth the diameter of the plate cylinder 12; a feeder unit 24 for supplying the printing paper onto the impression cylinder 22; a delivery unit 25 to be loaded with printed paper; and an original plate supply unit 26 within the plate cylinder 12 by which the spent press plates 28 are wound up whereas an unexposed original plate 29 is unwound.
  • the plate cylinder 12 is used to position the exposed press plates 28 for the four colors B (black), C (cyan), M (magenta) and Y (yellow) on its circumference at given intervals, say, at equal distances.
  • the unexposed original plate 29 can be installed on the entire circumference of the plate cylinder 12. Images of the four colors B, C, M and Y are written on the original plate 29 at equal distances, namely, at 90° out of phase so as to prepare the four-color press plates 28.
  • the plate cylinder 12 has its diameter adjusted to be smaller by the thickness of the original plate 29 (press plates 28) to be wound.
  • the original plate 29 is tightly wrapped around the plate cylinder 12 as it is held taut and thereafter fixed in position. In the case shown in Fig.
  • the original plate 29 is fixed on the circumference of the plate cylinder 12 as it is stretched by means of the original plate supply unit 26.
  • a plate clamp (not shown) may be employed that wraps a single original plate 29 (press plates 28) around the entire circumference of the plate cylinder 12 and which stretches it for fixation, as shown in Fig. 6.
  • the method of fixing the original plate 29 on the plate cylinder 12 is in no way limited and any other methods that are known in the art may be applicable.
  • the exposed press plates 28 for the four colors B, C, M and Y are formed around the single plate cylinder 12 so that the latter is a quadruple (4-fold) cylinder of the impression cylinder 22.
  • exposed press plates for n colors may be formed at given intervals around the single plate cylinder 12 so that it is used as an n-fold cylinder of the impression cylinder 22, where n may be any natural number but is preferably 2 or more.
  • the distance between adjacent exposed press plates 28 which are n in number is in no way limited as long as it is of a predetermined value.
  • the press plates 28 are disposed at equal distances that correspond to one-nth of the total circumference of the plate cylinder 12.
  • the platemaking unit 14 comprises the drawing section 30, the plate processing section 32 and the platemaking unit loading/unloading device (not shown).
  • an electrophotographic photoreceptor is used as the original plate 29, so the drawing section 30 comprises a corona charging device 34 that provides a charging zone for creating a uniform charge layer on the photoreceptor 29 and an exposure unit 36 that illuminates the charged photoreceptor 29 with laser light to form an electrostatic latent image on it.
  • the corona charging device 34 is provided in the charging zone and it may be of any type that is capable of forming a uniform charge layer on the photoreceptor 29.
  • the exposing unit 36 is such that the photoreceptor (original plate) 29 moving at a predetermined slow scan (subscanning) speed on the plate cylinder 12 rotating at a predetermined speed is exposed to laser light, whereby a digital halftone image of a certain monochromatic color is written as a latent image on that photoreceptor 29.
  • the exposing unit 36 comprises the following components: a laser light source 44 for emitting a laser beam L; an optical modulator 45 such as an AOM (acoustooptical modulator) that modulates the intensity of laser beam L in accordance with the image of the block copy; a light deflector 46 such as a rotaing polygonal mirror that reflects and deflects the intensity-modulated laser beam L so that it is scanned at the exposing position 36a in a fast scan (main scanning) direction that is generally perpendicular to the direction in which the plate cylinder 12 rotates (i.e., the direction in which the photoreceptor is fed); a scanning lens 47 such as an f ⁇ lens that focuses the laser beam L in such a way that it will have a uniform spot diameter at any fast scan (main scanning) position on the original plate 29 on the plate cylinder 12; a modulator circuit 48 for driving the optical modulator 45; and an image processor 49 which first produces a digital halftone image signal by performing digital processing on the image of the block copy and
  • the laser light source 44 may be of any type such as a semiconductor laser (a laser diode: LD) or a gas laser (e.g. a He-Ne laser or an Ar laser) that emit at such wavelengths that the photoreceptor will have a spectral sensitivity higher than a predetermined value.
  • a semiconductor laser a laser diode: LD
  • a gas laser e.g. a He-Ne laser or an Ar laser
  • a light-emitting diode (LED) can also be used if it has a satisfactory light intensity. If LD or LED is to be used, they may be directly modified without using the optical modulator 45.
  • conventional light sources such as a sodium lamp, a xenon lamp and a mercury lamp may also be used.
  • the optical modulator 45 may be replaced by known optical shutters that use various linear or nonlinear electrooptical materials, as exemplified by liquid-crystal shutters and electrooptical effect shutters using PLZT. If the light deflector 46 is not used, an array of known optical shutters may be provided on the fast scanning (main scanning) line defined at the exposing position 36a, with those optical shutters being turned on or off (opened or closed) imagewise. If desired, the array of optical shutters may be replaced by an array of LDs or LEDs, with those LDs or LEDs being turned on or off imagewise.
  • the light deflector 46 is in no way limited to the rotating polygonal mirror and it may be selected from among any types that are capable of deflecting laser beam L through a predetermined angle in one-dimensional direction. For example, even a galvanometer mirror and resonant scanner can be used.
  • the developing unit 38 comprises the following components: a tank 50 containing a liquid toner developer F; a nozzle 51 for ejecting the liquid toner developer F; two developing electrodes 52 that define the nozzle 51; an ejection means 53 by which the liquid toner developer F is ejected through the nozzle 51; and a squeeze roller 54.
  • the toner particles in the liquid toner developer F being ejected through the nozzle 51 by the ejection means 53 are deposited in a given amount on the image area (where the electrostatic latent image is formed) in accordance with the strength of electric field between each developing electrode 52 and the photoreceptor, whereby toner development of the latent image is effected.
  • the fixing unit 40 is for fixing the toner image on the plate 29 that has been subjected to toner development in the developing unit 38 and which has been freed of excess liquid toner developer by means of a squeeze roller 54. Having this capability, the fixing unit 40 is composed of a lamp heater, a panel heater or any other heater that dries the plate 29 and which thermally fixes the toner image on it.
  • the treating unit 42 comprises the following components: a tank 55 containing a solution that renders the light-sensitive material 29 hydrophilic, such as an aqueous solution containing a ferrocyanide compound; a roller 56 for pumping the treating solution in the tank 55; and a roller 57 that deposits the pumped treating solution on the surface of the plate 29.
  • a solution that renders the light-sensitive material 29 hydrophilic such as an aqueous solution containing a ferrocyanide compound
  • a roller 56 for pumping the treating solution in the tank 55
  • a roller 57 that deposits the pumped treating solution on the surface of the plate 29.
  • the platemaking unit loading/unloading device (not shown) allows the platemaking unit 14 to be contacted to the original plate 29 only in the platemaking process.
  • the operation of the device is in no way limited and any other methods that are known in the art may be applicable.
  • the original plate 29 made of an electrophotographic photoreceptor passes through the steps of exposure, development, fixing and hydrophilic treatment in the platemaking unit 14, whereby a press plate 28 for one color is prepared.
  • press plates 28 are produced in which images for the four colors B, C, M and Y have been written at equal distances on the circumference of the single plate cylinder 12.
  • an n-fold plate cylinder may be employed to carry press plates 28 in which images for the n colors have been similarly written at equal distances on the circumference.
  • the electrophotographic photoreceptor used as the original plate 29 may be selected from among all examples of "resin dispersed" electrophotographic photoreceptors which comprise a flexible electroconductive base such as aluminum or plastics or paper that have been rendered conductive and an overlying light-sensitive layer that has a photoconductive material such as zinc oxide (ZnO) or cadmium sulfide (CdS) dispersed in a binder such as a resin.
  • a photoconductive material such as zinc oxide (ZnO) or cadmium sulfide (CdS) dispersed in a binder such as a resin.
  • ZnO zinc oxide
  • CdS cadmium sulfide
  • other photoconductive materials may be used and they include inorganic species such as titanium oxide and amorphous silicon and organic species such as phthalocyanine compounds.
  • Electrophotographic Master ELP Mark I and Mark II of a ZnS-dispersed-in-resin type which are both produced by Fuji Photo Film Co., Ltd.
  • the developing unit 38 performs wet toner development, but if the electrophotographic photoreceptor used as the original plate 29 is of a certain selected type, the developing unit 38 may be adapted to perform dry toner development.
  • the original plate 29 to be used in the present invention also is not limited to electrophotographic photoreceptors, nor is the platemaking unit 14 limited to the case shown in Fig. 3.
  • the platemaking unit 14 need not have both the drawing section 30 and the plate processing section 32 as shown in Fig. 2 and, instead, it may solely be composed of the drawing section 30. Thus, one may properly select the drawing section 30, as well as the plate processing section 32 in accordance with the specific type of original plate used.
  • a plate for direct digital printing press such as a photosensitive resin material (photopolymer) may be used as the original plate 29 in such a way that exposure is followed by "strip development", in which the exposed or unexposed areas are stripped to leave the image or non-image areas behind, which is then finished to prepare a plate for letterpress (as made of a resin) or intaglio.
  • a photo-sensitive resin material, a light-and pressure-sensitive resin material, a light- and heat-sensitive resin material may be used as the original plate 29 in such a way that the image or non-image areas are exposed to harden to a lithographic, intaglio or relief plate.
  • a presensitized (PS) plate may be used in such a way that after imagewise exposure, it is subjected to PS development to prepare a press plate.
  • a silver halide photographic material may be used either independently or in addition to other light-sensitive materials.
  • a heat-sensitive material such as a heat-sensitive resin material may be used in such a way that it is illuminated with heat rays such as laser light until the image or non-image areas harden thermally to prepare a press plate.
  • the drawing section 30 of the platemaking unit 14 to be used in the printing press 10 may be operated by various other methods known in the art and they include: i) an impact process in which holes are made in the image or non-image areas on the surface of the original plate 29 by a physical means such as a needle so as to prepare a press plate for either intaglio or letterpress; ii) an ink-jet process in which minute drops of a liquid material are squirted from a special nozzle and steered in flight so that they are deposited on the image or non-image areas of the original plate 29, whereby oleophilic or hydrophilic areas are formed on its surface to prepare a lithographic plate; iii) an electroconductive base such as an aluminum base that has a silicon (Si) layer formed is used as the original plate 29 and the silicon layer is evaporated imagewise by means of an electric spark to prepare a press plate; and iv) a press plate
  • the ink supple assembly 16 supplies the respective press plates 28 with inks of the associated colors only at the time when the images of those colors come to the right position during printing.
  • the assembly 16 comprises four ink supply units 16B, 16C, 16M and 17Y for the four colors B, C, M and Y, respectively.
  • These ink supply units 16 (16B, 16C, 16M and 16Y) are not limited in any particular way and any conventional models known in the art may be used.
  • an ink supply assembly of the type shown in Fig. 4 may be used.
  • an ink in an ink fountain 58 starts to be supplied from between a duct roller 59 and a bottom plate 60 as the duct roller 59 rotates.
  • the supplied ink is transferred to a transfer roller 61 rotating in contact with the duct roller 59 and the transfer roller 61 as it retains the ink on the surface shifts towards an ink roller train 62 so that the ink is transferred to the first roller of the train 62.
  • the ink moves to successive rollers of the train 62, it is milled, homogenized and made equal in amount; thereafter one of the applicator rollers 63 (four in number in the case shown in Fig. 4) that contact the press plates 28 only when the images of the associated colors come to the right position is activated so that the ink is deposited evenly in the image area of the right color of a certain press plate 28 formed on the plate cylinder 12. If an image of a different color comes, the irrelevant applicator rollers 63 will be disengaged from the press plate 28.
  • an ink of the right color can be deposited on the image area of each press plate 28, which image area is either in relief if the plate is for letterpress or an oleophilic area not dampened with water if the plate is for lithography as in the case shown in Fig. 2 (the non-image area has been rendered hydrophilic with dampening water being supplied from the dampening water supply assembly to form a film).
  • ink supply assembly for intaglio (gravure) printing
  • highly flowable inks of a solvent-dispersed type are collected in ink trays (not shown) and the plate cylinder 12 is dipped directly in either one of those trays.
  • the inks are deposited on the press plates on the plate cylinder 12 by means of finisher rollers or jet streams of the respective inks are applied directly onto the press plates. Thereafter, excess inks are scraped off with doctor blades so that the remainder is left in minute (gravure) cells that form images.
  • the dampening water supply assembly 20 is a means by which a film of dampening water is always held in the necessary minimum amount to prevent the deposition of ink in the non-image area of a lithographic plate.
  • the non-image area of a lithographic plate has been rendered hydrophilic so as to permit the deposition of a film of dampening water.
  • the dampening water supply assembly comprises four units 20B, 20C, 20M and 20Y for the four colors B, C, M and Y, respectively.
  • the dampening water supply assembly 20 preferably comprises four units if the plate cylinder 12 is a quadruple cylinder and it preferably comprises n units if the plate cylinder is an n fold cylinder. However, a single dampening water supply assembly may be used in association with a 4 ( n )-fold plate cylinder 12. In case of lithographic printing, the above-described roller-type assembly for supplying dampening water may be replaced by various other known types of assembly.
  • the impression cylinder 22 is a member around which the printing paper 23 is wrapped and retained in position by a known holder means such as paper grippers and which is to be brought into contact with the blanket cylinder at a predetermined printing pressure so that the ink images carried on the blanket cylinder 18 are transferred onto the printing paper wound around the impression cylinder. If, as in the case under consideration, the press plates 28 formed on the plate cylinder 12 have images of the four colors B, C, M and Y, the impression cylinder 22 retaining the single sheet of printing paper 23 on the circumference will make four revolutions as the plate cylinder 12 rotates fully once, thereby completing four full-color printing on that printing paper 23. Thereafter, the impression cylinder 22 releases the completed sheet of paper and retains a freshly fed sheet of printing paper.
  • a known holder means such as paper grippers
  • the original plate supply unit 26 which is disposed within the plate cylinder 12 winds up the spent press plates 28 from its entire circumference while, at the same time, unwinding the unexposed (fresh) original plate 29 onto the entire circumference of the plate cylinder so that it is fixed thereto.
  • the supply unit 26 comprises a takeup roller 68 for winding up the spent press plates 28, an unwinding roller 69 onto which the unexposed original plate 29 has been wound, and means (not shown) for fixing those rollers 68 and 69 in position.
  • the printing press indicated by 70 in Fig. 6 can be used not only in letterpress or intaglio but also as a waterless di-litho (direct lithographic) press which does not employ dampening water. It is the same as the press 10 shown in Fig. 1 except that the blanket cylinder 18 and the dampening water supply assembly 20 are omitted so that direct printing is effected as the plate cylinder 12 around which the press plates 28 have been wound is placed in direct contact with the impression cylinder 22 around which the printing paper 23 has been wrapped.
  • the printing press indicated by 72 in Fig. 7 can be used as a di-litho press in the presence of dampening water; if the dampening water supply assembly 20 is added to the printing press 70 shown in Fig. 5, the press 72 is obtained and it is capable of printing by direct lithography.
  • the printing press indicated by 74 in Fig. 8 is applicable not only to letterpress offset printing and intaglio offset printing but also to waterless lithographic offset printing. It is the same as the printing press 10 shown in Fig. 2 except that it does not include the dampening water supply assembly 20.
  • Described hereinabove is the basic construction of a printing press.
  • the printing press according to the present invention is described below.
  • an unexposed (fresh) original plate (yet to be processed press plates) is wrapped around a single plate cylinder.
  • the images of n colors which have typically been subjected to digital processing in n drawing sections are simultaneously written as either latent or visible images in separate colors on the original plate with laser light or the like as it is wrapped around the plate cylinder; then, the images are simultaneously processed in the corresponding n plate processing sections to form press plates on the plate cylinder, whereby press plates are prepared on the surface of which the images of n colors have been correctly written at equal distances, each being one-nth of the circumference of the plate cylinder.
  • a plurality of ink supply units for the respective colors that are provided around the plate cylinder will successively supply inks of those colors, with each ink being deposited only at the time when the image of the corresponding color (or the press plate carrying that image) on the plate cylinder has come to the right position.
  • dampening water may be supplied to the plates, as required, by means of dampening water supply units before the inks are supplied.
  • the impression cylinder that contacts the plate cylinder either directly or via a rubber-covered blanket cylinder, that has a diameter one-nth of that of the plate cylinder and that holds a single sheet of printing paper wrapped around it rotates in forward direction at the same peripheral speed as the surface of the press plates on the plate cylinder; when the impression cylinder rotates fully once, the ink image of one color on a press plate on the plate cylinder is transferred onto the printing paper either directly or after it is transferred to the intermediate blanket cylinder.
  • the impression cylinder has made n revolutions as it holds the printing paper
  • the plate cylinder rotates fully once and by repeating the transfer step n times, n colors are printed on the paper.
  • the impression cylinder releases the paper on which n colors have been printed and holds a freshly supplied sheet of printing paper so that it is subjected to another printing cycle.
  • the printing press according to the present invention is simple in construction and compact enough to realize a small-sized system; further, it is capable of simultaneous preparation of press plates for all colors that are needed in accomplishing multicolor printing, whereby the process time from platemaking to printing operations can be shortened; at the same time, the press is easy to operate and enables printing to be done at comparatively high speed.
  • the press is applicable to various types of pressplates whether they are for letterpress, intaglio or lithography (either in the presence or absence of dampening water); at the same time, it is applicable to both direct printing and offset printing.
  • a light-sensitive material such as an electrophotographic photoreceptor or a silver halide photographic material may be mounted on the plate cylinder, with each platemaking unit being composed of a drawing section and a section for processing the light-sensitive material so as to prepare a proof.
  • Fig. 1 is a cross-sectional view showing schematically an embodiment of the printing press according to the present invention.
  • the printing press generally indicated by 80 is a direct process rotary sheet feeding four-color lithographic offset press that uses dampening water and which comprises the following components: a single plate cylinder 12 around which press plates 28 (exposed) for four colors can be formed at given intervals; four platemaking units 14 positioned around and near the plate cylinder 12 that are capable of simultaneous preparation of press plates for four colors; an ink supply assembly 16 for four colors B, C, M and Y; a rubber-covered blanket cylinder 18 onto which ink images are to be transferred from the press plates 28; a dampening water supply assembly 20 for four colors; an impression cylinder 22 whose diameter is one-fourth the diameter of the plate cylinder 12; a feeder unit 24 for supplying the printing paper onto the impression cylinder 22; a delivery unit 25 to be loaded with printed paper; and an original plate supply unit 26 within the plate cylinder 12 by which the spent press plates 28 are wound up whereas an
  • the printing press 80 shown in Fig. 1 has the same construction as the printing press 10 shown in Fig. 2, except for the inclusion of four platemaking unit 14s (14B, 14C, 14M and 14Y) for the four colors B, C, M and Y.
  • the same components are identified by likenumerals and will not be described in detail.
  • the plate cylinder 12 is used to position the press plates 28 for the four color B (black), C (cyan), M (magenta) and Y (yellow) on its circumference at given intervals, say, at equal distances. It is particularly required that the plate cylinder 12 be adapted to have the four platemaking units 14 positioned around it so that press plates for the four colors can be prepared simultaneously.
  • Each of the platemaking units 14 comprises a drawing section 30, a plate processing section 32 and the platemaking unit loading/unloading device (not shown). To insure that press plates for n colors can be prepared simultaneously, the individual platemaking units 14 are positioned at equal distances (i. e., 360/n degrees apart) around the circumference of the plate cylinder 12. In the case shown in Fig. 8, the platemaking assembly 14 comprises four units 14B, 14C, 14M and 14Y for the four colors B, C, M and Y and to insure that press plates for these four colors can be prepared simultaneously, the units are positioned at equal distances (90° out of phase) around the circumference of the plate cylinder 12.
  • the platemaking assembly 14 (14B, 14C, 14M and 14Y) is in no way limited to the case shown in Figs. 2 and 8. As already mentioned, the platemaking assembly 14 (14B, 14C, 14M and 14Y) need not have both the drawing section 30 (30B, 30C, 30M and 30Y) and the plate processing section 32 (32B, 32C, 32M and 32Y) as shown in Figs. 3 and 1 and, instead, it may solely be composed of the drawing section 30 (30B, 30C, 30M and 30Y).
  • an ink supply assembly typically shown by 16 in Fig. 4 which applied to the printing press 10 shown in Fig. 2 according to the background art may be used as the ink supply assembly and, at the same time, a dampening water supply assembly typically shown by 20 in Fig. 5 may be used as the dampening water supply assembly 20.
  • the printing press 80 shown in Fig. 1 differs from the printing press 10 of Fig. 2 in that the platemaking assembly 14 is composed of four units 14B, 14C, 14M and 14Y. Except for the platemaking process, the printing press 80 shown in Fig. 1 is capable of performing a printing process in essentially the same manner as the printing press 10 shown in Fig. 2.
  • the printing press 80 may be equipped with a device for achieving registration between individual colors, say, B, C, M and Y.
  • the printing press indicated by 82 in Fig. 9 can be used not only in letterpress or intaglio but also as a waterless di-litho (direct lithographic) press which does not employ dampening water. It is the same as the press 80 shown in Fig. 1 except that the blanket cylinder 18 and the dampening water supply assembly 20 are omitted, so that direct printing is effected as the plate cylinder 12 around which the press plates 28 have been wound is placed in direct contact with the impression cylinder 22 around which the printing paper 23 has been wrapped.
  • the printing press indicated by 86 in Fig. 11 is applicable not only to letterpress offset printing and intaglio offset printing but also to waterless lithographic offset printing. It is the same as the printing press 80 shown in Fig. 1 except that it does not include the dampening water supply assembly 20.
  • Fig. 12 shows only the platemaking unit 14 and the ink supply unit 16 for a single color but it goes without saying that in the actual printing process, the platemaking units 14 for n colors and the ink supply units 16 for n colors are used in such a way that the former are alternately replaced positionally at a time by the latter with respect to all n colors.
  • the mechanisms (the loading/unloading devices) for moving the platemaking unit 14 and the ink supply unit 16 are not shown in Fig. 15 but they are not limited in any particular way and may be in the form of physically independent devices or in such a form that they are made integral with each other either partly or in entirety.
  • the plate cylinder 12 covered with the original plate 29 may be used either as a cylindrical drum of electrophotographic photoreceptor having a photoconductive layer on the top or as an exposure drum covered with a light-sensitive material (e.g. an electrophotographic photoreceptor, a silver halide photographic material, a photo-sensitive resin material) or a pressure-sensitive resin material or a heat-sensitive resin material whereas the impression cylinder is used as a transfer drum, so that the images formed are successively transferred onto the image-receiving sheet around the transfer drum, thereby producing a proof carrying a color image.
  • a light-sensitive material e.g. an electrophotographic photoreceptor, a silver halide photographic material, a photo-sensitive resin material
  • the printing press 88 can also be used as an image forming apparatus for proofing if the ink supply unit 16 is not employed.
  • the light-sensitive material and the image-receiving sheet that are to be used in this embodiment are not limited in any particular way and may be selected from among any types that are known in the art.

Landscapes

  • Rotary Presses (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (12)

  1. Presse d'impression en couleurs qui comporte un seul cylindre porte-clichés (12) qui permet la disposition de clichés d'impression (28) pour n couleurs (B, C, M, Y) sous forme cylindrique à des intervalles prédéterminés, un cylindre d'impression (22) dont le diamètre est egal à 1/n fois celui du cylindre porte-clichés (12) , le cylindre d'impression (22) ayant une feuille unique de papier d'impression (23) enroulée sur lui et transmettant la feuille de papier d'impression (23) après qu'elle a effectué n tours consécutifs, et un ensemble de transmission d'encres (16) des n couleurs (B, C, M, Y), caractérisé par n ensembles de fabrication de clichés (14M, 14C, 14B, 14Y) qui sont disposées à la circonférence du cylindre portecliches (12) et près du cylindre porte-clichés (12) pour la préparation individuelle de clichés d'impression (28) pour les couleurs séparées.
  2. Presse d'impression en couleurs selon la revendication 1, dans laquelle les ensembles de fabrication de clichés (14M, 14C, 14B, 14Y) et l'ensemble de transmission d'encre (16) sont mobiles tous deux en direction parallele à l'axe central du cylindre porte-clichés (12) afin qu'ils soient disposés en alternance dans la même position audessus du cylindre porte-clichés (12).
  3. Presse d'impression en couleurs selon la revendication 1 ou 2, dans laquelle chacun des ensembles de fabrication de cliches (14M, 14C, 14B, 14Y) comporte une section de dessin (30M, 30C, 30B, 30Y) qui écrit une image sur un cliché original non exposé (29) enroulé sur le cylindre porte-clichés (12) et une section de traitement de cliché (32M, 32C, 32B, 32Y) qui traite le cliché original (29) pour la préparation d'un cliché d'impression (28).
  4. Presse d'impression en couleurs selon la revendication 3, dans laquelle le cliché original (29) est formé d'un matériau photosensible.
  5. Presse d'impression en couleurs selon la revendication 3, dans laquelle le cliché original (29) est un photorécepteur électrophotographique.
  6. Presse d'impression en couleurs selon l'une quelconque des revendications 3 à 5, dans laquelle la section de dessin (30M, 30C, 30B, 30Y) est composée d'un ensemble d'exposition par un laser.
  7. Presse d'impression en couleurs selon l'une quelconque des revendications 3 à 6, dans laquelle la section de traitement de cliché (32M, 32C, 32B, 32Y) est composée d'un ensemble de développement de type humide.
  8. Presse d'impression en couleurs selon l'une quelconque des revendications 1 à 7, qui comporte en outre un mécanisme de transmission de cliché original (26) dans le cylindre porte-clichés (12), le mécanisme enroulant le cliché (28) avec lequel une opération d'impression a été terminée et déroulant un cliché original non exposé (29).
  9. Presse d'impression en couleurs selon l'une quelconque des revendications 1 à 8, qui contient en outre un cylindre porte-blanchet de report d'encre (18) placé entre le cylindre porte-clichés (12) et le cylindre d'impression (22).
  10. Presse d'impression en couleurs selon la revendication 9, dans laquelle le cylindre porte-blanchet (18) a le même diamètre que le cylindre porte-clichés (12) ou le cylindre d'impression (22).
  11. Presse d'impression en couleurs selon l'une quelconque des revendications 1 à 10, dans laquelle le cliché d'impression (28) est destiné à une impression typographique, en creux ou lithographique.
  12. Presse d'impression en couleurs selon la revendication 11, qui utilise le cliché lithographique comme cliché d'impression (28) et qui comprend en outre un ensemble d'alimentation en eau de mouillage pour la transmission d'eau de mouillage au cliché d'impression (28).
EP19920107737 1991-05-10 1992-05-07 Presse à imprimer Expired - Lifetime EP0512549B2 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP10589891 1991-05-10
JP3105898A JP2737811B2 (ja) 1991-05-10 1991-05-10 印刷方法および装置
JP105898/91 1991-05-10
JP169561/91 1991-07-10
JP16956191A JPH0516324A (ja) 1991-07-10 1991-07-10 印刷装置
JP16956191 1991-07-10

Publications (3)

Publication Number Publication Date
EP0512549A1 EP0512549A1 (fr) 1992-11-11
EP0512549B1 EP0512549B1 (fr) 1995-06-28
EP0512549B2 true EP0512549B2 (fr) 2002-09-25

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EP19920107737 Expired - Lifetime EP0512549B2 (fr) 1991-05-10 1992-05-07 Presse à imprimer

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EP (1) EP0512549B2 (fr)
DE (1) DE69203148T3 (fr)

Cited By (1)

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FR2709572B1 (fr) * 1993-06-23 1995-10-27 Nipson Procédé d'impression d'au moins une image et presse pour la mise en Óoeuvre.
US5355795A (en) * 1993-08-26 1994-10-18 Presstek, Inc. Automatic plate-loading cylinder for use with plate-imaging systems
IL118102A (en) * 1995-05-03 2001-01-11 Scitex America Corp System and method for computer to press printing
EP0771646A3 (fr) * 1995-10-31 1999-08-11 Dainippon Screen Mfg. Co., Ltd. Imprimeur numérique
US5813336A (en) * 1995-12-22 1998-09-29 Heidelberger Druckmaschinen Ag Printing unit with axially removable printing sleeves
US5727749A (en) * 1996-02-05 1998-03-17 Presstek, Inc Automatic plate-loading cylinder with constant circumferential tension
EP0802457A1 (fr) * 1996-04-16 1997-10-22 Agfa-Gevaert N.V. Procédé pour la fabrication et l'enregistrement de l'image pour plaques lithographiques
US6009807A (en) * 1997-03-28 2000-01-04 Dainippon Screen Mfg. Co., Ltd. Printing apparatus
US6024017A (en) * 1997-09-26 2000-02-15 Dainippon Screen Mfg. Co., Ltd. Printing apparatus
JP3435323B2 (ja) * 1997-09-30 2003-08-11 大日本スクリーン製造株式会社 印刷装置および印刷装置に使用する印刷版の現像処理方法
US6026747A (en) * 1999-01-19 2000-02-22 Presstek, Inc. Automatic plate-loading cylinder for multiple printing members
US6336404B1 (en) 1999-02-01 2002-01-08 Dainippon Screen Mfg. Co., Ltd. Printing apparatus, and a processing device in the printing apparatus
DE10125545A1 (de) 2001-05-23 2002-11-28 Heidelberger Druckmasch Ag Druckverfahren und Vorrichtung
JP3779952B2 (ja) * 2002-04-17 2006-05-31 リョービ株式会社 枚葉印刷機の印刷ユニット
CN113232402B (zh) * 2021-05-26 2023-06-09 蔡亚琴 一种正面夜光绒类胶印设备及其工艺

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US6889607B2 (en) 2002-10-02 2005-05-10 Heidelberger Druckmaschinen Ag Method for drawing a printing master onto a printing form cylinder

Also Published As

Publication number Publication date
DE69203148T2 (de) 1995-11-02
DE69203148T3 (de) 2003-01-16
DE69203148D1 (de) 1995-08-03
EP0512549A1 (fr) 1992-11-11
EP0512549B1 (fr) 1995-06-28

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