EP0421145B2 - Machine offset - Google Patents

Machine offset Download PDF

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Publication number
EP0421145B2
EP0421145B2 EP19900117234 EP90117234A EP0421145B2 EP 0421145 B2 EP0421145 B2 EP 0421145B2 EP 19900117234 EP19900117234 EP 19900117234 EP 90117234 A EP90117234 A EP 90117234A EP 0421145 B2 EP0421145 B2 EP 0421145B2
Authority
EP
European Patent Office
Prior art keywords
blanket
cylinder
layer
volume
compressible
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
EP19900117234
Other languages
German (de)
English (en)
Other versions
EP0421145A2 (fr
EP0421145A3 (en
EP0421145B1 (fr
Inventor
John Marshall Gaffney
James Brian Vrotacoe
Glen Alan Guaraldi
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.)
Goss International Americas LLC
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Priority to DE9018111U priority Critical patent/DE9018111U1/de
Publication of EP0421145A2 publication Critical patent/EP0421145A2/fr
Publication of EP0421145A3 publication Critical patent/EP0421145A3/de
Application granted granted Critical
Publication of EP0421145B1 publication Critical patent/EP0421145B1/fr
Publication of EP0421145B2 publication Critical patent/EP0421145B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • 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
    • 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
    • B41F30/04—Devices for attaching coverings or make-ready devices; Guiding devices for coverings attaching to transfer cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing

Definitions

  • one on one Blanket cylinder existing blanket a print image on sheet material upset.
  • the print image is placed on the blanket using a plate cylinder upset.
  • Any in the plate or blanket cylinder during the Vibrations present in machine operation cause smearing of the printed image and adversely affect print quality.
  • Known blanket cylinders an axially extending gap in which the opposite ends of the Blanket are attached. If the blanket cylinder gap is at the printing gap between plate and blanket cylinder, the vibrations tend to to transfer the cylinders. These vibrations adversely affect print quality and promote smearing of the printed image.
  • the smearing of the printed image is also caused by the fact that this Print nip, where the print image is transferred to the blanket, between the Surfaces back and forth.
  • the surfaces slide against each other, which too smearing of the printed image when the speed of the Blanket surface is either larger or smaller than the speed of the Surface that transfers the printed image to the rubber blanket.
  • EP 0 277 545 also discloses a device for applying sleeves Plate and blanket cylinders for the continuous printing machines mentioned above are shown.
  • the object of the present invention is that achieved by an offset printing press To improve print quality by eliminating the smear effect on printed images or at least minimized.
  • the offset printing machine comprises a blanket cylinder on which a blanket is present that applies the printed image to the sheet material.
  • a color transfer The surface on the plate cylinder transfers the print image to the sheet material.
  • the ink transfer surface on the plate cylinder and the blanket are on Printing gap, which is formed by the plate and the blanket cylinder, with each other in rolling contact.
  • the rubber blanket is in the form of a tube that extends over coherent gap-free outer and inner surfaces.
  • the rubber blanket is removable on the outer peripheral surface of the blanket cylinder.
  • the outer surface of the rubber blanket stands with the ink-transferring Surface on the plate cylinder at the resulting pressure gap in rolling contact. Since the Outer peripheral surface of the rubber blanket is cohesive and gap-free, is between rubber blanket and ink-free surface of the plate cylinder reaches a shock-free and vibration-free rolling contact, to thereby effect the transfer of a printed image to the rubber blanket without the printed image to smear.
  • the rubber blanket is at least partially made of a volume compressible material that passes through the plate cylinder at the pressure gap formed by the impression cylinder and blanket cylinder.
  • the tubular rubber blanket has an outer cylindrical layer made of non-volume compressible Material and over a cylindrical layer of volume compressible material, which on an inner Layer of solid material is applied.
  • the outer layer of the rubber blanket gives way to the compress the volume-compressible layer of the rubber blanket.
  • the volume compressible layer of the rubber blanket contains a variety of bubbles that are relatively compressed before the volume compressible layer is compressed are large and in the area of the volume-compressible layer, which yields at the pressure gap the outer layer of the rubber blanket is relatively small.
  • the solid inner material layer absorbs the tensile stress of the blanket cylinder, thereby creating a to establish a firm pressure relationship between the blanket and the blanket cylinder. Through this pressure relationship the blanket is attached to the blanket cylinder so that it too during the machine run no relative movement comes.
  • the printing press comprises means for executing a radial expansion of the tubular blanket on the blanket cylinder to determine the pressure relationship between the blanket and lifting blanket cylinder. When the pressure relationship is released, the rubber blanket manually removed from the blanket cylinder in the axial direction. Furthermore, the rubber blanket must be radial be stretched on the outside in order to apply the blanket axially to the blanket cylinder. To this function to execute, the printing press has appropriate means.
  • place a blanket axially on the blanket cylinder to apply or remove from the blanket cylinder can be in a preferred Embodiment part of the frame, which is located next to an axial end of the blanket cylinder, to be cleared out of the way.
  • the tubular rubber blanket can be axially through the opening in the frame, which is created by clearing the frame part out of the way.
  • the inside of the cylinder In order to stretch the rubber blanket so that it can be applied to the cylinder, the inside of the cylinder must be be supplied with compressed air. There are passages between the outer peripheral surface and the Inside the blanket cylinder. Compressed air directed into the inside of the blanket cylinder is therefore also present the inside of the blanket so that the blanket is attached to the blanket cylinder is stretched. After placing the blanket on the outer circumference of the blanket cylinder the compressed air can be removed. The blanket then pulls around the blanket cylinder around and fits tightly and covers the circumference of the cylinder across the axial width of the Blanket and in the circumferential direction of the inner surface of the blanket. This pressure relationship between Blanket and blanket cylinder can be picked up by the inside of the blanket cylinder again is supplied with compressed air so that the rubber blanket can be removed manually from the cylinder.
  • the present invention can be implemented in a number of different configurations and in a number of different offset printing machines can be used.
  • the drawings show the present invention, as well as it is used in a perfect offset printing machine 10.
  • the lithographic printing machine 10 prints on opposite sides of a sheet of sheet material 12.
  • the lithographic printing machine 10 comprises identical lower and upper blanket cylinders 14, 16.
  • the blankets 18, 20 are attached to the blanket cylinders 14, 16 and transfer the printed images on the opposite sides of the web 12.
  • the upper and lower plate cylinders 22, 24 wear printing plates that are in rolling contact with the rubber blankets 18, 20 at the pressure gaps 26, 28.
  • the printed images are applied to the blankets 18, 20 by means of the printing plates on the plate cylinders 22, 24 upset. These printed images are in turn opposed to each other by means of the rubber blankets 18, 20 Side of the web 12 applied.
  • the printing press 10 comprises an upper and a lower dampening unit 30, 32, the dampening solution on the Apply pressure plates to plate cylinders 22, 24.
  • the upper and lower inking units are also transferred 34, 36 ink on the printing plates of the plate cylinders 22, 24.
  • a drive unit which is shown schematically in Fig. 1 shown and designated 38, ensures that the blanket cylinders 14, 16 and the plate cylinder 22, 24 revolve at the same peripheral speed.
  • the drive unit provides 38 power for the drive of the dampening units 30, 32 and the inking units 34, 36.
  • One of this exemplary embodiment is also conceivable different configuration of the printing press 10; for example only one side of lane 12 be printed.
  • the rubber blanket 18 has a coherent one column-free outer surface.
  • the rubber blanket 18 By placing the rubber blanket 18 with a coherent gap-free Provides the outside surface, the rolling contact between the blanket 18 and the pressure plate tends to be softer and to be relatively vibration free.
  • the smearing of the printed image is prevented by the fact that Rubber blanket 18 is designed to be compressible at the printing nip 26, as a result of which the rubber blanket 18 is attached to the same Peripheral speed rotates like the pressure plate of the plate cylinder 22 immediately in front of the printing nip, at the pressure gap and immediately behind the pressure gap to prevent slipping between the outer surface of the Prevent blanket 18 and the outer surface of the printing plate of the plate cylinder 22.
  • a cylindrical outer surface 40 of the rubber blanket 18 is coherent and free of gaps around one to cause soft rolling contact on the cylindrical outer surface 42 of the pressure plate of the plate cylinder 18.
  • the absence of gaps in the soft cylindrical outer surface 40 of the blanket is prevented the appearance of jerky movements or vibrations, compared to a gap in Antage with the surface 42 of the printing plate rolls on the plate cylinder 22 or rolls away from it.
  • the smear effect on the printed images will the application to the surface 40 of the rubber blanket 18 by means of the pressure plate of the plate cylinder 22 minimized.
  • the diameter of the blanket 18 and the diameter of the blanket cylinder 14 can be minimized.
  • the surface 40 of the blanket can be applied over the entire area a printed image can be applied to the surface 40.
  • the printed image can extend over an area in which a gap was previously formed in the surface of known blanket cylinders.
  • the rubber blanket 18 with a cylindrical outer surface 40 which is contiguous and is free of gaps, is designed to reduce the waste that arises during the printing process.
  • each revolution of the blanket cylinder 14 saved about 6.35 mm (0.25 inches).
  • the rubber blanket 18 consists at least partially of a volume-compressible material. If on that volume compressible material of the rubber blanket 18 a force is exerted, the volume of the volume compressible material. The material of the rubber blanket 18 is through the rigid plate cylinder 22nd compressed at the nip 26. Because the rubber blanket is at least partially made of volume-compressible material there is, the rubber blanket 18 radially inwards, without the rubber blanket at the pressure gap 26 radially to deform outwards.
  • the peripheral speed is of the blanket at all points immediately before the pressure gap 26, at the pressure gap and immediately behind the printing gap formed by blanket cylinder 18 and plate cylinder 22. Since the Speed of dots on the surface 40 of the blanket on the opposite sides of the pressure gap 26 and in the middle of the pressure gap is equal, the surface 40 of the blanket cylinder slip and the surface 42 of the printing plate on the plate cylinder 22 does not face each other at the printing nip from. This causes smearing of the printed image when the printing plate is applied to the plate cylinder 22 prevented on the blanket 18.
  • the blanket 18 is made of a non-volume compressible material, e.g. a rubber blanket 18a in FIG. 2, the non-volume-compressible material of the rubber blanket would radially outward and due to a circumferential pressure exerted by a printing plate on the plate cylinder 22a on the blanket yield laterally as illustrated schematically in FIG. 2.
  • the not volume compressible Material of the rubber blanket 18a which is displaced by the fact that the rubber blanket yields at the pressure gap 26, forms arches 46a and 48a on opposite sides of the pressure gap 26a.
  • the curvatures 46a and 48a are formed because the volume of the non-volume-compressible material, of which the rubber blanket 18a is made remains unchanged, even though it is not volume-compressible Yields material at the pressure gap 26a. Therefore, the volume of the material corresponds to that of the printing plate of the plate cylinder 22 is displaced, the volume of the material of the bulges 46a and 48a.
  • the Volume of the material displaced from the printing plate on the plate cylinder 22a corresponds to the volume that in the overlapping portions of the contours of the cylindrical outer surface 40a of the rubber blanket 18a and the cylindrical outer surface 42a of the printing plate on the plate cylinder 22a.
  • This volume of material is between the curved plane - as indicated by the dashed line 50a in Fig. 2 - and the curved outer surface 42a of the pressure plate on the plate cylinder 22a and extends over the axial Expansion of plate and blanket cylinders.
  • the speed of a point on the surface of the non - volume compressible material Rubber blanket 18a (Fig. 2) varies as the point moves from one side of the nip 26a to that opposite side of the pressure gap moves.
  • the circumferential speed increases as the material in the arch 46a moves into the pressure nip 36a moved into it.
  • Move out of the pressure gap 26a and move into the bulge 48a The non-volume compressible material loses speed and the peripheral speed increases from.
  • a point 52a on the surface of the dome 46a moves more slowly as a point 54a in the middle of the pressure gap 26a.
  • the situation is similar with a point 56a on the surface the curvature 48a which moves more slowly than the point 54a in the middle of the gap 26a.
  • the size the difference in the peripheral speed of the non-volume compressible material of the rubber blanket 18a the bulges 46a and 48a and the center of the pressure gap 26a depend on the degree of compliance of the non-volume compressible material of the blanket cylinder at the printing nip.
  • the rubber blanket 18 in FIG. 1 is designed differently than the rubber blanket 18a of Fig. 2.
  • the rubber blanket 18a of Fig. 2 is made of a non-volume compressible material.
  • the Rubber blanket 18 of FIG. 1 consists at least partially of a volume-compressible material. For this reason, the rubber blanket 18 from FIG. 1 does not deform in the manner shown schematically in FIG. 2.
  • the rubber blanket 18 has a hollow tubular construction.
  • the tubular rubber blanket 18 is fixed to the Blanket cylinder 14 connected and rotates with the blanket cylinder under the influence of the drive unit 38.
  • the tubular blanket 18 can be removed from the blanket cylinder 14 and replaced as will be explained below.
  • the tubular rubber blanket 18 can have various design options, it is formed in several layers in this exemplary embodiment according to the invention.
  • the blanket includes 18 a cylindrical outer layer 66 (FIG. 3) on which the soft coherent outer surface 40 the blanket is attached.
  • the cylindrical outer layer 66 consists of an elastically yielding and non-volume compressible polymer material, such as. B. made of natural rubber or synthetic rubber.
  • a second cylindrical layer / intermediate cylindrical layer 68 (FIG. 3) is radially inside the outer one Layer 66 arranged.
  • the intermediate layer 68 has a cylindrical outer surface 70 which is on a cylindrical Inner surface 72 of the outer layer 66 is attached.
  • the cylindrical intermediate layer 68 consists of an elastically volume-compressible polymer material, such as. made from natural rubber or from artificial rubber.
  • a third cylindrical layer 74 is arranged radially within the second layer 68.
  • the third layer 74 has a cylindrical outer surface 76 that abuts a cylindrical inner surface 78 of the second layer and is firmly connected to it.
  • the third layer 74 may be made of a different material in the illustrated embodiment of the invention, the third layer thereof is not volume compressible material such as outer layer 66.
  • the third layer 74 is firmly connected to a high rigid metal inner layer, which is a bearing bush 80 includes, which is fixedly connected to the blanket cylinder 14.
  • a third cylindrical inner surface 82 Layer 74 is fixedly connected to a cylindrical outer surface 84 of bushing 80.
  • a cylindrical inner surface 86 of the bush 80 abuts a cylindrical outer surface 88 of the cylinder 14.
  • the bushing 80 is made of nickel and can be detached with the blanket cylinder 14 connected so that the entire blanket 18 axially pushed onto the rigid metal blanket cylinder 14 (Fig. 1) and / or can be removed from the metal blanket cylinder. Because of this construction the rubber blanket 18 can be replaced after a certain period of use.
  • the bushing 80 is tensioned on the blanket cylinder 14 to establish a fixed pressure relationship to produce between blanket 18 and blanket cylinder 14. Because of this pressure relationship, that's Blanket 18 attached to the blanket cylinder 14, so that there is no relative during printing press operation Movement between the blanket and blanket cylinder results.
  • the printing press contains funds to perform the radial expansion of the tubular blanket on the blanket cylinder to the To cancel the pressure relationship between blanket 18 and blanket cylinder 14, as described below becomes.
  • the rubber blanket 18 can manually in the axial direction be removed from the blanket cylinder 14.
  • the sleeve 80 must be radially stretched or radially behind be stretched outside to move the blanket 18 to the blanket cylinder 14.
  • the printing press has means to perform this function, as will be described below.
  • tubular rubber blanket 18 is described as having a first and a third layer 66 and 74 of a non-volume compressible material and with a second layer 68 of volume compressible Material is formed, the tubular rubber blanket 18 - if desired - with a larger one Number or a smaller number of layers.
  • an additional Layer of volume-compressible material may be provided. This extra layer of volume compressible Material could be placed immediately adjacent to layer 68 and have a stiffness that is either higher or lower than that of layer 68.
  • each of the coaxial ones Layers 66, 68 and 74 have a cylindrical configuration.
  • the blanket 18 and a printing plate are placed on the plate cylinder 22 brought into contact with each other, as can be seen in Fig. 4.
  • the outer layer 66 of the rubber blanket at the printing nip 26 elastically deformed radially inwards.
  • the amount by which the outer layer 66 deforms radially inward is obtained from the amount by which the original contour of the cylindrical outer surface 40 of the Rubber blanket 18 overlaps the cylindrical contour of the outer surface 42 of the printing plate on the plate cylinder.
  • the outer surface 40 of the outer layer 66 is shown radially inward from that shown in phantom in FIG. 4 Position deformed into the position indicated by a solid line.
  • the cylindrical outer layer 66 consists of a non-volume-compressible material. If the outer Layer 66 is deformed radially inward, that is enclosed by the surface 40 of the outer layer Volume around in the space between the cylindrical outer surface 88 and surface 40 of the deformed outer layer 66 volume is reduced. Because the outer layer 66 is not made of one volume compressible material, the volume of the outer layer itself does not change when the outer layer is elastically deformed by the plate cylinder 22 as shown in FIG. 4.
  • the intermediate layer 68 of the blanket is made 18 made of a volume compressible material.
  • the plate cylinder 22 When the outer layer 66 through the pressure plate the plate cylinder 22 is deformed, the intermediate layer 68 is compressed elastically.
  • the volume of the space occupied by the second layer 68 from an exit or uncompressed volume (Fig. 3) to a second or compressed volume (Fig. 4) that is smaller than that Initial volume is.
  • the second layer 68 As the second layer 68 is compressed by the pressure plate on the plate cylinder 22, it deforms the outer layer 66 without radially outward on opposite sides of the pressure gap 26 to bulge, similar to the case of the rubber blanket 18a shown in FIG. 2. Thus form in the outer Layer 66 does not have bulges corresponding to bulges 46a and 48a when outer layer 66 of the rubber blanket 18 is deformed by the pressure plate on the plate cylinder 22 (FIG. 4). This is because that the intermediate layer 68 is compressed by an amount sufficient to the deformed material to accommodate the outer layer 66.
  • the volume-compressible second or intermediate layer 68 consists of a flexible, bubble-containing layer Foam.
  • the bubbles lose size or disappear entirely.
  • the second layer 68 are compressed, the volume of the volume compressible material that forms the second layer 68.
  • the tubular blanket 18 and the blanket cylinder 14 take a relative large first volume from the continuous cylindrical outer surface 40 of the outer Layer 66 is included.
  • the intermediate layer 68 contains relatively large bubbles and occupies a relatively large first volume / initial volume.
  • the outer layer 66 of the rubber blanket 18 is radially downstream deformed inside. Due to the deformation of the tubular outer layer 66, the rubber blanket 18 takes up a volume one that is smaller than the original or undeformed volume.
  • the total volume of the outer Layer 66 remains constant, however, and the outer layer bulges next to opposite sides of the pressure nip 26 not to the outside as in the case of the rubber blanket 14a illustrated in FIG. 2.
  • the intermediate layer 68 of the rubber blanket 18 becomes a volume compressed, which is smaller than the initial volume of layer 68.
  • the difference between that Output volume of the second layer 68 (FIG. 3) and the compressed volume of the second layer (FIG. 4) corresponds to the volume between the cylindrical outer surface 88 in FIG. 4 and the outer surface 40 of the outer layer 66. Therefore, the volume of that occupied by the rubber blanket 18 is reduced Space by compressing the second layer 68, and only the outer layer 66 is deformed radially inwards.
  • a layer of not stretchable material is between the outer layer (66) and the following volume compressible intermediate layer (68) of the Blanket of the printing machine according to the invention a layer of not stretchable material provided. Between layers 68 and 74 or in each of these layers can e.g. a deformable fabric or not stretchable material may be provided. The number of layers can also Be increased beyond the layer sequence specified in the patent claim.
  • volume compressible second layer 68 is preferred could be formed from a polymer foam that has a uniform stiffness second layer of cylindrical inner and outer sections of bubble-containing foam of different Stiffness are formed.
  • the compressible intermediate layer 68 could also consist of a material other than foam, e.g. from a resiliently deformable network or fabric.
  • the rubber blanket 18 is formed by applying adhesive to the cylindrical outer surface 84 of the metal bushing 80 is sprayed. Preformed strips of material are then wrapped in layers around the bushing. The strips comprise strips of the non-volume compressible material of the outer layer 66, of the volume-compressible material of the second layer 68 and the non-volume-compressible material of the third layer 74. The rubber material of the strips is then vulcanized so that there is a solid body forms which surrounds the metal sleeve 80.
  • the blanket 18 could be a flat piece of planar material be formed, which is then wrapped around the sleeve 80 and adheres to it. The opposite In this case, ends of the material part would abut.
  • the blanket 20 has the same construction.
  • the rubber blanket 20 with the printing plate on the plate cylinder 24 acts on the printing nip 28 on the same Way together like the rubber blanket 18 with the printing plate on the plate cylinder 22 at the printing nip 26.
  • FIGS brought open state When a blanket 18 is removed from the blanket cylinder 14 and replaced with another 5, the partial back 94 of the frame from the closed state is illustrated in FIGS brought open state. This creates an opening 102 in the frame 96 through which the Rubber blanket 18 can be passed.
  • the invention is the movable portion 94 of the frame by means of a hinge (not shown), that connects the movable section 94 and the frame 96 to each other, pivotable about a vertical Axle mounted.
  • the movable section 94 could, however, in other ways, if desired be stored.
  • a blanket 18 can be moved manually through the opening 102 in the axial direction from the blanket cylinder 14 can be removed.
  • a new blanket 18 is then aligned axially with the blanket cylinder 14 and pushed onto the blanket cylinder.
  • the movable portion 94 of the side frame is in the closed state back and brought into contact with the bearing 98 to rotate the blanket cylinder about its horizontal To store the central axis.
  • the blanket cylinder could rotate at one end about a hinge such that it could be pivoted into a position in which the blanket is removed from the blanket cylinder could be.
  • the rubber blanket 18 and the blanket cylinder 14 are fixed between the cylindrical Metal sleeve 80 (Fig. 3) on the inside of the blanket 18 and the outer periphery of the blanket cylinder 14 connected to each other.
  • the inner surface 86 (FIG. 3) of the cylindrical sleeve 80 has one uniform diameter, which is slightly smaller than the uniform diameter of the cylindrical outer surface 88 is on the outside of the metal blanket cylinder 14.
  • the required fit between the socket 80 and the rubber blanket cylinder 14 must be sufficient so that the rubber blanket during the machine run 18 firmly around the outer periphery of the blanket cylinder, so that the blanket opposite Blanket cylinder does not slip.
  • the blanket cylinder 14 In order to push the blanket 18 manually onto the blanket cylinder 14, the blanket is passed through Fluid pressure stretched elastically.
  • the blanket cylinder 14 is with radially extending passages 106 (Fig. 3).
  • the radially extending passages 106 are on a plurality of radial planes equal distances from each other, which extend in the blanket cylinder 14 over its entire length.
  • the blanket 18 Once the blanket 18 has been axially positioned on the blanket cylinder 14, the interior the blanket cylinder 14 vented into the atmosphere.
  • the sleeve 80 and the rubber blanket 18 then pulls together to firmly grasp the cylindrical outer surface 88 of the blanket cylinder 14.
  • the socket 80 is then kept under tension by the blanket cylinder 14.
  • the rubber blanket 18 requires approximately 413.7 KPa (60 psi) of compressed air to cause the bushing to expand.
  • the amount of compressed air required for the elastic expansion of the bushing 80 can of course be dependent the radial thickness of the sleeve 80, the material from which the sleeve is made and the fit vary between the sleeve and the blanket cylinder 14.
  • the rubber blanket 18 has an outer peripheral surface 40 which has no axially extending gap.
  • the outer surface 40 of the tube is at the pressure nip 26 with an ink-transferring surface on the plate cylinder 22 at the pressure nip 26 in rolling contact. Since the outer peripheral surface 40 of the rubber blanket 18 is contiguous and free of Splitting is a soft and vibration-free rolling contact between the ink-transferring surface of the Plate cylinder and the blanket reached, thereby transferring a print image to the blanket to enable without smearing the printed image.
  • the rubber blanket 18 consists at least partially of a volume-compressible material that is at the pressure nip 26 is pressed together by the pressure plate.
  • the outer surface 40 of the blanket 18 has a peripheral speed which in essential of the places immediately before the pressure gap 26, at the pressure gap and immediately behind the Pressure gap corresponds. This prevents slippage between the ink-transferring surface of the plate cylinder and rubber blanket in front of, on and behind the printing nip prevents smearing of the printed image to avoid.
  • the rubber blanket 18 is a tube with a cylindrical outer layer 66 made of non-volume-compressible Material and a cylindrical intermediate layer 68 made of volume-compressible material.
  • the outer layer 66 of the blanket 18 can be deformed to compress the intermediate layer 68 of the blanket.
  • Intermediate layer 68 of the blanket contains a plurality of bubbles which are pre-compressed the intermediate layer of the blanket are relatively large and in a part of the intermediate layer of the Blanket, which is compressed by deforming the outer layer of the blanket, relatively small are.
  • the rubber blanket 18 is manually pushed onto the rubber blanket cylinder 14 from one axial end. In order to provide access to one end of the blanket cylinder 14, preferably one next to one Axial end of the blanket cylinder lying portion of the frame are cleared out of the way. The tubular blanket 18 is pushed axially through frame 96 onto blanket cylinder 14 which is aligned with the rubber blanket.
  • the interior of the cylinder must be included Compressed air can be supplied. Passages 106 to the cylindrical outer surface 88 of the blanket cylinder 14 are available with the inside of the blanket cylinder. This means that the interior is supplied with compressed air of the blanket cylinder 14 with the inside of the blanket 18 in communication to the blanket during application to stretch on the blanket cylinder. After the blanket 18 on the outer circumference of the blanket cylinder 14 has been placed, the compressed air can be removed. The rubber blanket 18 pulls then comes together around the blanket cylinder 14, lies tightly and encloses the blanket cylinder circumference over the axial width of the rubber blanket and in the circumferential direction over the inner surface 86 of the Blanket 18.

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  • Printing Plates And Materials Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)

Claims (12)

  1. Machine d'impression offset pour imprimer une matière en feuilles ou en nappe continue (12) au moyen d'un cliché enroulé autour du cylindre porte-cliché (22, 24) et comportant un début et une fin, ainsi que d'un blanchet (18, 20) monté sur un cylindre de blanchet (14, 16), et le blanchet (18, 20) ayant la forme d'un tube qui comporte des surfaces extérieure et intérieure continues, sans solution de continuité et le blanchet (18, 20) étant monté amovible sur la surface circonférentielle extérieure du cylindre de blanchet (14, 16), dans le fait qu'une extrémité du cylindre de blanchet (14, 16) présente une disposition en palier (98), avec laquelle est en prise un élément partiel (94) logé dans un cadre latéral (96) pour porter le cylindre porte-cliché (22, 24) et le cylindre de blanchet (14, 16), et l'élément partiel (94) est mobile dans un état ouvert désolidarisé de la disposition en palier (98) et dans le fait que le blanchet de forme tubulaire (18, 20) peut être remplacé par l'intermédiaire de l'ouverture (102) dégagée par l'élément partiel (94), des moyens étant prévus pour la mise en oeuvre d'une extension radiale du blanchet (18, 20) se trouvant sur le cylindre de blanchet (14, 16) pour lever une assise stable entre la surface intérieure circonférentielle (86) du blanchet (18, 20 et la surface extérieure (88) du cylindre de blanchet (14, 16), le blanchet (18, 20) étant réalisé en outre au moins partiellement en une matière compressible et le blanchet tubulaire (18, 20) comportant une couche extérieure cylindrique (66) en matière non compressible et au moins une couche intermédiaire (68) en matière compressible qui est placée sur une couche intérieure (80) en matière solide, et la couche interne en matière solide étant un manchon radialement extensible (80), dont la surface interne (86) s'applique contre une surface extérieure cylindrique du cylindre de blanchet (14, 16) en absorbant la tension de traction du cylindre de blanchet pour réaliser ainsi une tension de pression ferme entre le cylindre de blanchet et le blanchet, de sorte qu'il est prévu entre la couche extérieure (66) et la couche intermédiaire (66) suivante compressible en volume une couche en matière non extensible et que le cas échéant une autre couche en matière non compressible en volume (74) est reliée à la surface intérieure (78) de la couche (68) compressible en volume et la surface intérieure (84) du manchon (80).
  2. Machine d'impression offset selon la revendication 1, caractérisée en ce que le moyen formant blanchet (18, 20) comprend une couche extérieure cylindrique (66) en matière non compressible qui se trouve sur la couche intermédiaire (68) qui est compressible, la couche extérieure (66) du moyen formant blanchet (18, 20) étant déformée par le cliché (22, 24) dans l'interstice d'impression (26, 28) afin de comprimer la couche intermédiaire (68), la surface extérieure du moyen formant blanchet (18, 20) ayant une vitesse circonférentielle qui est la même aux emplacements situés directement devant l'interstice d'impression (26, 28) et immédiatement derrière l'interstice d'impression (26, 28) afin d'éviter de rendre le tirage flou dans cet interstice d'impression (26, 28)
  3. Machine d'impression offset selon la revendication 2, caractérisée en ce que la couche extérieure du moyen formant blanchet (18, 20) a un premier volume lorsque la couche extérieure du moyen formant blanchet (18, 20) se trouve dans un état non déformé avant la déformation de la couche extérieure du moyen formant blanchet (18, 20) par le cliché (22, 24), la couche extérieure du moyen formant blanchet (18, 20) ayant un second volume qui correspond au premier volume lorsque la couche extérieure du moyen formant blanchet (18, 20) est déformée par le cliché (22, 24), la matière compressible de la couche intermédiaire (68) du moyen formant blanchet (18, 20) ayant un troisième volume lorsque la couche extérieure du moyen formant blanchet (18, 20) se trouve à l'etat non déformé, la couche intermédiaire du moyen formant blanchet (18, 20) ayant un quatrième volume qui est inférieur au troisième volume lorsque la couche extérieure du moyen formant blanchet (18, 20) est déformée par le cliché (22, 24).
  4. Machine d'impression offset selon la revendication 3, caractérisée en ce que la matière compressible de la couche intermédiaire (68) contient des bulles qui ont une première dimension lorsque la couche extérieure du moyen formant blanchet (18, 20) se trouve à l'état non déformé et dont au moins certaines ont une seconde dimension qui est inférieure à la première dimension lorsque la couche extérieure du moyen formant blanchet (18, 20) est déformée par le cliché placé sur le cylindre porte-cliché (22, 24).
  5. Machine d'impression offset selon la revendication 1, caractérisée en ce que le cylindre de blanchet (14, 16) comporte une surface extérieure cylindrique rigide (88) ayant un premier diamètre, le moyen formant blanchet (18, 20) ayant une surface cylindrique intérieure rigide (86) d'un second diamètre qui est plus petit que le premier diamètre afin d'obtenir un ajustement serré entre le cylindre de blanchet (14, 16) et le moyen formant blanchet (18, 20), le cylindre de blanchet (14, 16) comportant des moyens de passage (106) à l'aide desquels un courant de fluide est dirigé sur la surface intérieure (86) du moyen formant blanchet (18, 20) afin de dilater le moyen formant blanchet (18, 20) et d'augmenter le second diamètre de manière à permettre de placer le moyen formant blanchet (18, 20) en direction axiale sur le cylindre de blanchet (14, 16).
  6. Machine d'impression offset selon la revendication 1, caractérisée en ce que la couche extérieure (66) est en un polymère solide et déformable élastiquement qui est incompressible et la couche intermédiaire (68) est en une mousse déformable élastiquement d'un polymère qui est compressible et qui contient des bulles.
  7. Machine d'impression offset selon la revendication 1, caractérisée en ce que le blanchet (18, 20) a une conformation tubulaire et en ce que la couche intérieure rigide est un manchon creux (80) ayant un diamètre intérieur qui est plus petit que le diamètre extérieur du cylindre de blanchet (14, 16) afin d'obtenir ainsi un ajustement serré sur le cylindre de blanchet (14, 16).
  8. Machine d'impression offset selon la revendication 1, caractérisée en ce que le blanchet tubulaire (18, 20) a une structure stratifiée dont les couches peuvent être en des matériaux différents.
  9. Machine d'impression offset selon la revendication 8, caractérisée en ce qu'au moins une couche du blanchet tubulaire stratifié (18, 20) est formée d'une toile ou d'un treillis déformable souplement.
  10. Machine d'impression offset selon la revendication 8, caractérisée en ce que le blanchet tubulaire (18, 20) se compose de plus d'une couche compressible et les couches compressibles peuvent avoir des rigidités différentes.
  11. Machine d'impression offset selon la revendication 8, caractérisée en ce que le blanchet tubulaire (18, 20) se compose d'au moins une couche compressible qui a en elle-même une rigidité variable.
  12. Machine d'impression offset selon la revendication 8, caractérisée en ce que la couche intermédiaire compressible (68) contient des bulles dont la dimension diminue lorsqu'elles subissent une compression.
EP19900117234 1989-10-05 1990-09-07 Machine offset Expired - Lifetime EP0421145B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9018111U DE9018111U1 (de) 1989-10-05 1990-09-07 Lithographische Druckmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41758789A 1989-10-05 1989-10-05
US417587 1989-10-05

Publications (4)

Publication Number Publication Date
EP0421145A2 EP0421145A2 (fr) 1991-04-10
EP0421145A3 EP0421145A3 (en) 1991-09-25
EP0421145B1 EP0421145B1 (fr) 1993-12-08
EP0421145B2 true EP0421145B2 (fr) 1999-06-16

Family

ID=23654585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900117234 Expired - Lifetime EP0421145B2 (fr) 1989-10-05 1990-09-07 Machine offset

Country Status (7)

Country Link
EP (1) EP0421145B2 (fr)
JP (1) JP2569213B2 (fr)
CN (1) CN1026876C (fr)
CA (1) CA2026954C (fr)
DE (1) DE59003784D1 (fr)
ES (1) ES2048915T5 (fr)
HK (1) HK95394A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7775159B2 (en) 2005-03-30 2010-08-17 Goss International Americas, Inc. Cantilevered blanket cylinder lifting mechanism
US7819057B2 (en) 2005-03-30 2010-10-26 Goss International Americas, Inc. Print unit having blanket cylinder throw-off bearer surfaces
US7849796B2 (en) 2005-03-30 2010-12-14 Goss International Americas, Inc Web offset printing press with articulated tucker
US8037818B2 (en) 2005-04-11 2011-10-18 Goss International Americas, Inc. Print unit with single motor drive permitting autoplating

Families Citing this family (27)

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US6374734B1 (en) 1989-10-05 2002-04-23 Heidelberger Druckmaschinen Ag Tubular printing blanket
FR2660895B1 (fr) * 1990-04-12 1994-10-28 Rollin Sa Cylindre revetu d'un blanchet d'impression.
US5352507A (en) * 1991-04-08 1994-10-04 W. R. Grace & Co.-Conn. Seamless multilayer printing blanket
CA2068629C (fr) * 1991-05-14 1996-05-07 James B. Vrotacoe Blanchet d'imprimerie tubulaire sans passage
DE4217793C1 (de) * 1992-05-29 1993-12-09 Roland Man Druckmasch Offset-Gummituch und Verfahren zu dessen Herstellung
US5245923A (en) * 1992-07-07 1993-09-21 Heidelberg Harris Inc. Printing press with movable printing blanket
US5215013A (en) * 1992-07-07 1993-06-01 Heidelberg Harris Inc. Printing blanket with noise attenuation
DE4230431C2 (de) * 1992-09-11 1996-09-26 Roland Man Druckmasch Offset-Gummituchhülse
DE4337554A1 (de) * 1992-12-16 1994-06-23 Heidelberger Druckmasch Ag Lithographische Offsetdruckmaschine
DE4307320C2 (de) * 1993-03-09 1998-10-01 Roland Man Druckmasch Verfahren zur Herstellung einer mit einer Gummischicht oder einem Gummituch versehenen Platte für eine Druckmaschine
US5347927A (en) * 1993-05-04 1994-09-20 W. R. Grace & Co.-Conn. Anisotropic endless printing element and method for making the same
EP0652104B1 (fr) * 1993-11-05 2002-04-10 MAN Roland Druckmaschinen AG Unité d'impression pour impression offset sans eau de mouillage
US5535674A (en) * 1994-06-24 1996-07-16 Heidelberger Druckmaschinen Ag Distortion-reduced lithographic printing press
DE4430693B4 (de) † 1994-08-30 2005-12-22 Man Roland Druckmaschinen Ag Antriebe für eine Rollenrotations-Offsetdruckmaschine
JP2832157B2 (ja) † 1995-02-16 1998-12-02 住友ゴム工業株式会社 印刷用ブランケット
DE19720549A1 (de) * 1997-05-16 1998-11-19 Heidelberger Druckmasch Ag Verfahren zur Herstellung von zylindrischen Beschichtungsträgern
DE19720551A1 (de) * 1997-05-16 1998-11-19 Heidelberger Druckmasch Ag Basisträgerhülse für Rotationsdruckmaschinen
US6073558A (en) * 1998-07-20 2000-06-13 Heidelberger Druckmaschinen Ag Printing press having blanket cylinder with filler bar and blanket
DE19921388A1 (de) 1999-05-10 2000-11-16 Roland Man Druckmasch Rotationsdruckmaschine mit einem Form-, einem Übertragungs- und einem Gegendruckzylinder
DE10055031A1 (de) * 2000-11-07 2002-05-08 Bobotex Hans Ladwig Gmbh & Co Wickelband für eine Walze
DE10228686A1 (de) * 2002-06-27 2004-02-12 Man Roland Druckmaschinen Ag Gummizylinderhülse für Offset-Druckmaschinen
DE10257745A1 (de) 2002-12-10 2004-07-22 Man Roland Druckmaschinen Ag Gummizylinderhülse für Offset-Druckmaschinen
DE102004011882A1 (de) * 2003-12-16 2005-07-21 Koenig & Bauer Ag Druckwerk für eine Druckmaschine ohne Feuchtwerk sowie Drucktuch
KR100628274B1 (ko) * 2004-11-04 2006-09-27 엘지.필립스 엘시디 주식회사 인쇄롤용 블랭킷
CN102658510A (zh) * 2012-05-03 2012-09-12 上海欣展橡胶有限公司 一种齿形胶辊的制造工艺
JP2015525689A (ja) * 2012-07-10 2015-09-07 アムコー リミテッドＡｍｃｏｒ Ｌｉｍｉｔｅｄ 印刷装置、印刷方法及び印刷用の一組の版
WO2021096484A1 (fr) * 2019-11-11 2021-05-20 Hewlett-Packard Development Company, L.P. Appareil d'apprêt

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US1804139A (en) * 1926-01-16 1931-05-05 Frank W Adsit Printing blanket for offset work
DE564221C (de) * 1931-02-23 1932-11-15 Edmond Uher Jun Andruckkoerper fuer Druckereien
JPS527371A (en) * 1975-07-08 1977-01-20 Nippon Cement Co Ltd Method for removing nitrogen oxides in gases
GB1581233A (en) * 1976-06-02 1980-12-10 Drg Uk Ltd Printing press
DE3139494C2 (de) * 1981-09-30 1983-11-10 Herlitz Ag, 1000 Berlin Walze
JPS59179345A (ja) * 1983-03-29 1984-10-11 モスタイプ・コ−ポレイシヨン 取りはずし可能な印刷シリンダ用心棒組立
JPS59209198A (ja) * 1983-05-13 1984-11-27 Sumitomo Rubber Ind Ltd オフセツト印刷機用ブランケツト
DE3543704A1 (de) * 1985-12-11 1987-06-19 Md Papierfabrik Pasing Nicolau Vorrichtung und verfahren zum bedrucken einer bahn
JPS6330165U (fr) * 1986-08-12 1988-02-27
DE3702889A1 (de) * 1987-01-31 1988-08-11 Roland Man Druckmasch Vorrichtung zum aufbringen einer huelse auf einen druckwerkzylinder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7775159B2 (en) 2005-03-30 2010-08-17 Goss International Americas, Inc. Cantilevered blanket cylinder lifting mechanism
US7819057B2 (en) 2005-03-30 2010-10-26 Goss International Americas, Inc. Print unit having blanket cylinder throw-off bearer surfaces
US7849796B2 (en) 2005-03-30 2010-12-14 Goss International Americas, Inc Web offset printing press with articulated tucker
US8250976B2 (en) 2005-03-30 2012-08-28 Goss International Americas, Inc. Cantilevered blanket cylinder lifting mechanism
US8037818B2 (en) 2005-04-11 2011-10-18 Goss International Americas, Inc. Print unit with single motor drive permitting autoplating

Also Published As

Publication number Publication date
JP2569213B2 (ja) 1997-01-08
HK95394A (en) 1994-09-16
ES2048915T3 (es) 1994-04-01
CN1050701A (zh) 1991-04-17
CN1026876C (zh) 1994-12-07
DE59003784D1 (de) 1994-01-20
EP0421145A2 (fr) 1991-04-10
ES2048915T5 (es) 1999-11-01
EP0421145A3 (en) 1991-09-25
CA2026954A1 (fr) 1991-04-06
CA2026954C (fr) 1997-05-06
EP0421145B1 (fr) 1993-12-08
JPH03128247A (ja) 1991-05-31

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