EP0421145A2 - Machine d'impression lithographique - Google Patents

Machine d'impression lithographique Download PDF

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Publication number
EP0421145A2
EP0421145A2 EP90117234A EP90117234A EP0421145A2 EP 0421145 A2 EP0421145 A2 EP 0421145A2 EP 90117234 A EP90117234 A EP 90117234A EP 90117234 A EP90117234 A EP 90117234A EP 0421145 A2 EP0421145 A2 EP 0421145A2
Authority
EP
European Patent Office
Prior art keywords
blanket
cylinder
layer
outer layer
rubber blanket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90117234A
Other languages
German (de)
English (en)
Other versions
EP0421145A3 (en
EP0421145B2 (fr
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

  • the present invention relates to an offset printing machine.
  • a printed image is applied to sheet material by means of a rubber blanket provided on a blanket cylinder.
  • the print image is applied to the rubber blanket using a plate cylinder.
  • Any vibrations present in the plate or blanket cylinder during machine operation cause the printed image to be smeared and have an adverse effect on the print quality.
  • Known blanket cylinders have an axially extending gap in which the opposite ends of the blanket are fastened. When the blanket cylinder gap is at the pressure gap between the plate and blanket cylinders, the vibrations tend to be transmitted to the cylinders. These vibrations adversely affect the print quality and promote smearing of the printed image.
  • the smearing of the printed image is also caused by the fact that it slides back and forth between the surfaces at the printing nip, where the printed image is transferred to the rubber blanket.
  • the surfaces thus slide against one another, which leads to smearing of the printed image if the speed of the rubber blanket surface is either greater or less than the speed of the surface which transfers the printed image to the rubber blanket.
  • the object of the present invention is to improve the print quality achieved by an offset printing machine by eliminating or at least minimizing the smear effect in printed images.
  • the offset printing machine comprises a blanket cylinder, on which a blanket is present, which applies the printed image to the sheet material.
  • a color transfer surface on the plate cylinder transfers the print image to the sheet material.
  • the ink-transferring surface on the plate cylinder and the blanket are in rolling contact with one another at the pressure gap which is formed by the plate and the blanket cylinder.
  • the blanket is in the form of a tube which has contiguous gap-free outer and inner surfaces.
  • the blanket is removably mounted on the outer peripheral surface of the blanket cylinder.
  • the outer surface of the rubber blanket is in rolling contact with the ink-transferring surface on the plate cylinder at the resulting pressure gap. Since the outer peripheral surface of the blanket is coherent and free of gaps, a bumpless and vibration-free rolling contact is achieved between the blanket and the ink-transferring surface of the plate cylinder, thereby causing the transfer of a printed image to the blanket without smearing the printed image.
  • the rubber blanket is at least partially made of a compressible material which is pressed together by the plate cylinder at the printing nip formed by the printing cylinder and the rubber blanket cylinder.
  • the outer surface of the rubber blanket has a peripheral speed which is in the essentially corresponds to that in places immediately before, at and behind the pressure gap. This prevents a slipping effect between the surfaces of the printing plate and the rubber blanket in front of, at and behind the printing nip, thereby avoiding smearing of the printed image.
  • the tubular rubber blanket has an outer cylindrical layer of non-compressible material and a cylindrical layer of compressible material which is applied to an inner layer of solid material.
  • the outer layer of the rubber blanket gives way to compress the compressible layer of the rubber blanket.
  • the compressible layer of the blanket contains a plurality of bubbles which are relatively large prior to the compression of the compressible layer and which are relatively small in the area of the compressible layer which is compressed at the pressure nip by yielding the outer layer of the rubber blanket.
  • the solid inner layer of material absorbs the tensile stress of the blanket cylinder, thereby establishing a firm pressure relationship between the blanket and the blanket cylinder.
  • This pressure relationship fixes the blanket on the blanket cylinder so that there is no relative movement while the machine is running.
  • the printing press includes means for radially expanding the tubular blanket on the blanket cylinder to relieve the pressure relationship between the blanket and the blanket cylinder. When the pressure relationship is released, the blanket is manually removed from the blanket cylinder in the axial direction. Furthermore, the rubber blanket must be stretched radially outward in order to apply the rubber blanket axially to the rubber blanket cylinder.
  • the press has the appropriate means to perform this function.
  • a portion of the frame that is adjacent to an axial end of the blanket cylinder can be cleared out of the way .
  • the tubular rubber blanket can be passed axially through the opening in the frame created by clearing the frame member out of the way.
  • the interior of the cylinder In order to stretch the rubber blanket so that it can be applied to the cylinder, the interior of the cylinder must be supplied with compressed air. There are passages between the outer peripheral surface and the inside of the blanket cylinder. Compressed air directed into the interior of the blanket cylinder is thus in communication with the interior of the blanket, so that the blanket is stretched on the blanket cylinder during application. After the blanket is placed on the outer circumference of the blanket cylinder, the compressed air can be removed. The blanket then contracts around the blanket cylinder and fits snugly around the circumference of the cylinder over the axial width of the blanket and in the circumferential direction of the inner surface of the blanket. This pressure relationship between the rubber blanket and the rubber blanket cylinder can be removed by supplying the interior of the rubber blanket cylinder with compressed air again, 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 applied in a number of different offset printing machines.
  • the drawings show the present invention as used in a perfecting and offset printing press 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 and transferred to the blanket cylinders 14, 16 the printed images on the opposite sides of the web 12.
  • the upper and lower plate cylinders 22, 24 carry printing plates which are in rolling contact with the rubber blankets 18, 20 at the printing nips 26, 28.
  • the printed images are applied to the blankets 18, 20 by means of the printing plates on the plate cylinders 22, 24. These printed images are in turn applied by means of the rubber blankets 18, 20 to opposite sides of the web 12.
  • the printing press 10 comprises an upper and a lower dampening unit 30, 32, which apply dampening solution to the printing plates of the plate cylinders 22, 24.
  • the upper and lower inking units 34, 36 transfer ink to the printing plates of the plate cylinders 22, 24.
  • a drive unit which is shown schematically in FIG. 1 and is designated by 38, ensures that the blanket cylinders 14, 16 and the plate cylinders 22 , 24 revolve at the same peripheral speed.
  • the drive unit 38 supplies power for driving the dampening units 30, 32 and the inking units 34, 36. It is also conceivable to design the printing press 10 different from this exemplary embodiment; for example only one side of the web 12 can be printed.
  • the rubber blanket 18 has a coherent, gap-free outer surface.
  • the rolling contact between the blanket and the pressure plate tends to be softer and relatively vibration-free.
  • the smearing of the printed image is prevented by the fact that the rubber blanket 18 is designed to be compressible at the printing nip 26, as a result of which the rubber blanket 18 rotates at the same circumferential speed as the printing plate of the plate cylinder 22 immediately in front of the printing nip, at the printing nip and immediately behind the printing nip to prevent slipping between the outer surface of the blanket 18 and to prevent the outer surface of the pressure plate of the plate cylinder 22.
  • a cylindrical outer surface 40 of the rubber blanket 18 is coherent and gap-free in order to bring about a smooth 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 prevents the occurrence of jerky movements or vibrations compared to a gap that rolls on or rolls away from the plate cylinder 22 in contact with the surface 42 of the printing plate. Because there are no jerky movements or vibrations, the smear effect on the printed images during application to the surface 40 of the rubber blanket 18 is minimized by means of the pressure plate of the plate cylinder 22.
  • the diameter of the blanket 18 and the diameter of the blanket cylinder 14 can be minimized.
  • a printed image can thus be applied to the surface 40 of the rubber blanket over the entire area of the surface 40.
  • the printed image can extend over an area in which a gap has previously been formed in the surface of known blanket cylinders.
  • the rubber blanket 18 is provided with a cylindrical outer surface 40 which is coherent and free of gaps reduces the waste which arises during the printing process. In a specific embodiment of the invention, approximately 0.25 inches are saved with each revolution of the blanket cylinder 14.
  • the rubber blanket 18 is at least partially made of a compressible material. If on the compressible Material of the rubber blanket 18 is exerted a force, the volume of the compressible material decreases. The material of the rubber blanket 18 is compressed by the rigid plate cylinder 22 at the pressure gap 26. Since the rubber blanket consists at least partially of compressible material, the rubber blanket gives radially inward without deforming the rubber blanket radially outward at the pressure gap 26.
  • the peripheral speed of the rubber blanket is the same at all points immediately in front of the printing gap 26, at the printing gap and immediately behind the printing gap formed by the 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 printing nip 26 and in the middle of the printing nip is the same, the surface 40 of the blanket cylinder and the surface 42 of the printing plate on the plate cylinder 22 do not slide against each other at the printing nip. This prevents smearing of the printed image when the printing plate is applied to the plate cylinder 22 on the rubber blanket 18.
  • the rubber blanket 18 was made of a non-compressible material, such as a rubber blanket 18a in Fig. 2, the non-compressible material of the rubber blanket would be radially outward and laterally due to a circumferential pressure exerted by a pressure plate on the plate cylinder 22a on the rubber blanket give way, as illustrated schematically in Fig. 2.
  • the non-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-compressible material from which the rubber blanket 18a is made remains unchanged, even though the non-compressible material yields at the pressure gap 26a. Therefore, the volume of the material that is displaced from the pressure plate of the plate cylinder 22 corresponds to the volume of the material of the bulges 46a and 48a.
  • the volume of the material shifted from the printing plate on the plate cylinder 22a corresponds to the volume of 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 located between the curved plane - as indicated by the dashed line 50a in FIG. 2 - and the curved outer surface 42a of the printing plate on the plate cylinder 22a and extends over the axial extent of the plate and blanket cylinders.
  • the speed of a dot on the surface of the non-compressible material of the blanket 18a (Fig. 2) varies as the dot moves from one side of the nip 26a to the opposite side of the nip.
  • the material is accelerated to the extent and the peripheral speed increases as the material in the arch 46a moves into the pressure gap 36a.
  • the pressure gap 26a is left and the curvature 48a is moved in, the non-compressible material loses speed and the peripheral speed decreases.
  • a point 52a on the surface of the dome 46a moves slower than a point 54a in the center of the pressure gap 26a.
  • the situation is similar with a point 56a on the surface of the curvature 48a which moves more slowly than the point 54a in the middle of the gap 26a.
  • the size of the difference in the peripheral speed of the non-compressible material of the rubber blanket 18a at the domes 46a and 48a and the center of the nip 26a depend on the degree of yield of the non-compressible material of the blanket cylinder at the nip.
  • the velocity of the dot increases to a velocity greater than the peripheral velocity of the printing plate the plate cylinder 22a.
  • the speed of movement of the point decreases as this point moves away from the center of the pressure gap 26a and towards a point on the bulge 48a.
  • the speed of a point on the surface of the bulge 48a is less than the peripheral speed of the printing plate on the plate cylinder 22a.
  • the rubber blanket 18 in FIG. 1 is configured differently than the rubber blanket 18a in FIG. 2.
  • the rubber blanket 18a in FIG. 2 consists of a non-compressible material.
  • the rubber blanket 18 of FIG. 1 consists at least partially of a compressible material. For this reason, the rubber blanket 18 of FIG. 1 does not deform in the manner shown schematically in FIG. 2.
  • the rubber blanket 18 has a hollow tubular construction.
  • the tubular blanket 18 is fixedly connected to the blanket cylinder 14 and rotates with the blanket cylinder under the influence of the drive unit 38.
  • the tubular blanket 18 can, however, be removed from the blanket cylinder 14 and exchanged, as will be explained further below.
  • the tubular rubber blanket 18 can have various design options, in this exemplary embodiment according to the invention it is constructed in multiple layers.
  • the blanket 18 includes a cylindrical outer layer 66 (FIG. 3) on which the soft coherent outer surface 40 of the blanket is attached.
  • the cylindrical outer layer 66 consists of an elastically yielding and non-compressible polymer material, such as. made from natural rubber or from artificial rubber.
  • a second cylindrical layer / intermediate cylindrical layer 68 (FIG. 3) is arranged radially within the outer layer 66.
  • the intermediate layer 68 has a cylindrical outer surface 70 which is attached to a cylindrical inner surface 72 of the outer layer 66.
  • the intermediate cylindrical layer 68 is made of an elastically compressible polymeric 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 which bears against a cylindrical inner surface 78 of the second layer and is fixedly connected thereto.
  • the third layer 74 may be made of a different material, in the illustrated embodiment of the invention the third layer is made of the same non-compressible material as the outer layer 66.
  • the third layer 74 is fixedly connected to a hollow rigid metal inner layer which comprises a bearing bush 80 which is fixedly connected to the blanket cylinder 14.
  • a cylindrical inner surface 82 of the third layer 74 is fixedly connected to a cylindrical outer surface 84 of the bush 80.
  • a cylindrical inner surface 86 of the bush 80 bears against a cylindrical outer surface 88 of the cylinder 14.
  • the sleeve 80 is made of nickel and is detachably connected to the blanket cylinder 14 so that the entire blanket 18 can be pushed axially onto the rigid metal blanket cylinder 14 (FIG. 1) and / or removed from the metal blanket cylinder. Due to this construction, the rubber blanket 18 can be replaced after a certain period of use.
  • the bushing 80 is applied to the blanket cylinder 14 under tension in order to establish a firm pressure relationship between the blanket 18 and the blanket cylinder 14. Due to this pressure relationship, the blanket 18 is attached to the blanket cylinder 14, so that there is no relative movement between the blanket and the blanket cylinder during printing press operation.
  • the printing press includes means for radially expanding the tubular blanket on the blanket cylinder to relieve the pressure relationship between blanket 18 and blanket cylinder 14, as will be described below. When the pressure relationship is released, the blanket 18 can be manually removed from the blanket cylinder 14 in the axial direction. Likewise, the socket 80 radially stretched or stretched radially outward to move the blanket 18 onto the blanket cylinder 14.
  • the printing press has means for performing this function, as will be described further below.
  • tubular rubber blanket 18 is described with a first and a third layer 66 and 74 made of a non-compressible material and with a second layer 68 of a compressible material, the tubular rubber blanket 18 could - if desired - also with a larger number or one smaller number of layers.
  • an additional layer of compressible material may be provided. This additional layer of 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 layers 66, 68 and 74 has a cylindrical configuration.
  • the blanket 18 and a printing plate are brought into contact with one another on the plate cylinder 22, as can be seen in FIG. 4.
  • the outer layer 66 of the rubber blanket is elastically deformed radially inward at the printing gap 26.
  • the amount by which the outer layer 66 is deformed radially inward results 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 deformed radially inward from the position shown in broken lines in FIG. 4 into the position indicated by a solid line.
  • the cylindrical outer layer 66 consists of a non-compressible material.
  • the volume enclosed by the surface 40 of the outer layer is reduced by the volume located in the space between the broken line 88 and surface 40 of the deformed outer layer 66. Since the outer layer 66 is made of a non-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 inner layer 68 of the blanket 18 is made of a compressible material.
  • the outer layer 66 is deformed by the pressure plate on the plate cylinder 22, the inner layer 68 is elastically compressed.
  • the volume of the space occupied by the second layer 68 is thus reduced from an initial or uncompressed volume (FIG. 3) to a second or compressed volume (FIG. 4) that is smaller than the initial volume.
  • the outer layer 66 deforms without bulging radially outward on opposite sides of the pressure gap 26, similarly to the case of the rubber blanket 18a shown in FIG. 2.
  • no curvatures corresponding to the curvatures 46a and 48a form in the outer layer 66 when the outer layer 66 of the rubber blanket 18 is deformed by the pressure plate on the plate cylinder 22 (FIG. 4).
  • the velocity is at locations on the surface 40 of the outer layer which are immediately in front of the pressure gap 26, in the middle of the pressure gap and immediately behind the pressure gap, substantially equal to the speed of the surface of the printing plate on the plate cylinder 22.
  • This leads to a soft rolling contact between the rubber blanket 18 and the printing plate on the plate cylinder 22 at the printing nip 26 without the slipping effect between the surfaces 40 and 42 occurring.
  • This promotes the transfer of a print image from the printing plate on the plate cylinder 22 to the blanket 18 without the print image being smeared.
  • the compressible second or inner layer 68 consists of a resilient bubble-containing foam.
  • the bubbles lose size or disappear entirely.
  • the volume of the compressible material that forms the second layer 68 is reduced.
  • the tubular rubber blanket 18 and the rubber blanket cylinder 14 take up a relatively large first volume, that of the continuous cylindrical outer surface 40 of the outer layer 66 is included.
  • the intermediate cylindrical 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 deformed radially inwards. Due to the deformation of the tubular outer layer 66, the rubber blanket 18 takes up a volume that is smaller than the original or undeformed volume. However, the total volume of the outer layer 66 remains constant, and the outer layer does not bulge out adjacent to opposite sides of the pressure gap 26 as in the case of the rubber blanket 14a illustrated in FIG. 2.
  • the inner layer 68 of the blanket 18 is compressed to a volume that is less than the initial volume of the layer 68.
  • the difference between the initial volume of the second layer 68 (FIG. 3) and the compressed volume of the second layer (FIG. 4) corresponds to the volume between the dashed line 88 in FIG. 4 and the outer surface 40 of the outer layer 66. Therefore, it takes place reducing the volume of space occupied by the blanket 18 by compressing the second layer 68, and only the outer layer 66 is deformed radially inward.
  • the rubber blanket 18 differently than in the embodiment of Figg. 3 and 4 can be illustrated.
  • a deformable fabric or a non-stretch material could be provided between layers 66, 68 and 74 or in each of these layers. The number of layers could both be increased or reduced.
  • the compressible second layer 68 is preferably formed from a polymer foam having a uniform stiffness, the second layer could be formed from cylindrical inner and outer portions of bubble-containing foam of different stiffness.
  • the compressible inner layer 68 could also be made of a material other than foam, such as a resiliently deformable network or fabric.
  • the rubber blanket 18 is formed by spraying adhesive onto the cylindrical outer surface 84 of the metal bushing 80. Preformed strips of material are then wrapped in layers around the bushing. The strips comprise strips of the non-compressible material of the outer layer 66, the compressible material of the second layer 68 and the non-compressible material of the third layer 74. The rubber material of the strips is then vulcanized on, so that a solid body is formed which forms the metal bushing 80 surrounds.
  • the blanket could be formed as a flat piece of planar material which is then wrapped around and adhered to the sleeve 80. In this case, the opposite ends of the material part would abut.
  • the blanket 20 has the same construction.
  • the blanket 20 cooperates with the printing plate on the plate cylinder 24 at the printing nip 28 in the same manner as the rubber blanket 18 with the printing plate on the plate cylinder 22 at the printing nip 26.
  • the tubular blanket 18 can be telescopically mounted on the blanket cylinder 14 and stored so that it can also be removed while the blanket cylinder remains in the printing machine 10. Access to an axial end portion of the blanket cylinder 14 is provided by allowing a portion 94 of a side frame 96 of the printing press 10 to be moved from an open to a closed state. When the side frame section 94 is in the closed state, it engages a bearing assembly 98 to support one end of the blanket cylinder 14.
  • the portion 94 of the frame is brought from the closed state to the open state illustrated in FIG. 5. This creates an opening 102 in the frame 96 through which the rubber blanket 18 can be passed.
  • the movable section 94 of the frame is pivotably mounted about a vertical axis by means of a joint (not shown) which connects the movable section 94 and the frame 96 to one another.
  • the movable section 94 could - if desired - also be stored in other ways.
  • the end of the blanket cylinder 14 opposite the side frame 96 supports the entire weight of the blanket cylinder.
  • a relatively strong bearing arrangement can be provided in the opposite side frame, or a counterweight can be connected to the end of the blanket cylinder 14 opposite the side frame 96.
  • a rubber blanket 18 can be manually removed from the rubber blanket cylinder 14 through the opening 102 in the axial direction. A new blanket 18 is then axially aligned with the blanket cylinder 14 and pushed onto the blanket cylinder. Once the new blanket 18 has been slid onto the blanket cylinder 14, the movable portion 94 of the side frame is returned to the closed condition and brought into contact with the bearing 98 to support the blanket cylinder for rotation about its horizontal central axis.
  • the blanket cylinder is completely removed from the machine using a crane and the blanket is replaced at a location remote from the printing press.
  • the blanket cylinder could pivot at one end about a hinge such that it could be pivoted to a position where the blanket could be removed from the blanket cylinder.
  • the blanket 18 and the blanket cylinder 14 are connected to one another via a tight fit between the cylindrical metal bushing 80 (FIG. 3) on the inside of the blanket 18 and the outer circumference of the metal blanket cylinder 14.
  • the inner surface 86 (FIG. 3) of the cylindrical sleeve 80 has a uniform diameter that is slightly smaller than the uniform diameter of the cylindrical surface 88 on the outside of the metal blanket cylinder 14.
  • the required fit between the bushing 80 and the blanket cylinder 14 must be sufficient for the blanket 18 to lie firmly around the outer circumference of the blanket cylinder during machine operation so that the blanket does not slip relative to the blanket cylinder.
  • the blanket cylinder 14 is thus provided with radially extending passages 106 (FIG. 3).
  • the radially extending passages 106 are equally spaced apart on a plurality of radial planes which extend in the blanket cylinder 14 over its entire length.
  • the blanket cylinder 14 is hollow and connected to a fluid source under pressure via a line 110 (FIG. 5).
  • a line 110 By the line 110 into the interior of the blanket cylinder 14 compressed air flows through the passages 106 to the outside (FIG. 3) and presses against the inner surface 86 of the metal bushing 80. Due to the compressed air, the metal bushing 80 elastically expands in the circumferential direction by an amount which is sufficient to manually push the blanket 18 onto the blanket cylinder 14 with a minimum of effort.
  • the interior of the blanket cylinder 14 is vented to the atmosphere.
  • the bushing 80 and the blanket 18 then contract to firmly grip the outer surface 88 of the blanket cylinder 14.
  • the sleeve 80 is then held under tension by the blanket cylinder 14.
  • compressed air of approximately 60psi is required to cause the bushing to expand.
  • the amount of compressed air required for the elastic expansion of the sleeve 80 can of course vary depending on the radial thickness of the sleeve 80, the material from which the sleeve is made and the fit between the sleeve and the blanket cylinder 14.
  • the aim of the present invention is to improve the print quality achieved with an offset printing press by eliminating or at least reducing the smear effect in printing presses applied to sheet material 12 by the printing press.
  • the printing press comprises a blanket cylinder 14 which carries a blanket 18 which transfers the printed image to the sheet material.
  • An ink-transferring surface on the plate cylinder 22 transfers the print image to the rubber blanket 18.
  • the ink-transferring surface and the rubber blanket are in rolling contact with one another at the pressure gap formed between the two cylinders.
  • the rubber blanket 18 has an outer peripheral surface 40 which has no axially extending gap.
  • the outer surface 40 of the tube is in rolling contact at the pressure gap 26 with an ink-transferring surface on the plate cylinder 22 at the pressure gap 26. Since the outer peripheral surface 40 of the rubber blanket 18 is continuous and free of gaps, a soft and vibration-free rolling contact is achieved between the ink-transferring surface of the plate cylinder and the rubber blanket, thereby enabling the transfer of a print image to the rubber blanket without smearing the print image.
  • the rubber blanket 18 is at least partially made of a compressible material which is pressed together at the pressure gap 26 by the pressure plate.
  • the outer surface 40 of the rubber blanket 18 has a peripheral speed which essentially corresponds to that at locations immediately in front of the pressure nip 26, at the pressure nip and immediately behind the pressure nip. This prevents slippage between the ink-transferring surface of the plate cylinder and the rubber blanket in front of, on and behind the printing nip, in order to avoid smearing of the printed image.
  • the rubber blanket 18 is a tube with a cylindrical outer layer 66 made of non-compressible material and a cylindrical inner layer 68 made of compressible material.
  • the outer layer 66 of the rubber blanket 18 can be deformed to compress the inner layer 68 of the rubber blanket.
  • the inner layer 68 of the rubber blanket contains a plurality of bubbles which are relatively large before the compression of the inner layer of the rubber blanket and which are relatively small in a part of the inner layer of the rubber blanket which is compressed by deforming the outer layer of the rubber blanket.
  • the rubber blanket 18 is manually pushed onto the rubber blanket cylinder 14 from one axial end. To allow access to one end of the blanket cylinder 14, a portion of the frame adjacent to an axial end of the blanket cylinder may preferably be cleared out of the way. The tubular rubber blanket 18 is pushed axially through the frame 96 onto the rubber blanket cylinder 14 which is aligned with the rubber blanket.
  • the interior of the cylinder must be supplied with compressed air. Passages 106 to the outer peripheral surface 88 of the blanket cylinder 14 communicate with the inside of the blanket cylinder.
  • the inside of the blanket cylinder 14 supplied with compressed air communicates with the inside of the blanket 18 to stretch the blanket when applied to the blanket cylinder.
  • the compressed air can be removed.
  • the rubber blanket 18 contracts around the rubber blanket cylinder 14, lies firmly against it and encloses the rubber blanket cylinder circumference over the axial width of the rubber blanket and in the circumferential direction over the inner surface 86 of the rubber 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)
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 true EP0421145A2 (fr) 1991-04-10
EP0421145A3 EP0421145A3 (en) 1991-09-25
EP0421145B1 EP0421145B1 (fr) 1993-12-08
EP0421145B2 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 (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0514344A1 (fr) 1991-05-14 1992-11-19 Heidelberg Harris Inc. Blanchet d'impression tubulaire sans fente
EP0571909A2 (fr) * 1992-05-29 1993-12-01 MAN Roland Druckmaschinen AG Blanchet pour l'impression offset
DE4320924A1 (de) * 1992-07-07 1994-01-13 Heidelberger Druckmasch Ag Druckgummituch mit Lärmdämpfung
EP0581019A1 (fr) * 1992-07-07 1994-02-02 Heidelberger Druckmaschinen Aktiengesellschaft Blanchet pour machine à imprimer en offset
FR2699110A1 (fr) * 1992-12-16 1994-06-17 Heidelberger Druckmasch Ag Presse d'impression lithographique offset.
DE4307320C1 (de) * 1993-03-09 1994-07-14 Roland Man Druckmasch Druckmaschine für indirekte Druckverfahren und Verfahren zur Herstellung einer mit einer Gummischicht oder einem Gummituch versehenen Hülse oder Platte
EP0697284A3 (fr) * 1994-06-24 1997-01-02 Heidelberger Druckmasch Ag Minimisation de la déformation dans une presse lithographique
EP0631884B1 (fr) * 1993-05-04 1998-07-15 PT Sub, Inc. Elément sans fin anisotrope d'impression
EP0974459A1 (fr) * 1998-07-20 2000-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Cylindre blanchet dans une machine rotative
FR2793440A1 (fr) * 1999-05-10 2000-11-17 Roland Man Druckmasch Machine a imprimer rotative comportant un cylindre porte- forme, un cylindre de transfert et un cylindre de pression
US6799512B2 (en) 2002-06-27 2004-10-05 Man Roland Druckmaschinen Ag Rubber cylinder sleeve for offset printing presses
EP0727326B2 (fr) † 1995-02-16 2006-03-08 Sumitomo Rubber Industries Ltd. Blanchet d'impression
EP0699524B2 (fr) † 1994-08-30 2009-11-11 manroland AG Machine rotative d'impression offset à bobines
CN117962468A (zh) * 2023-12-27 2024-05-03 河南锦上源包装材料有限公司 一种印刷总成和改变印刷纸行进方向的方法

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE4230431C2 (de) * 1992-09-11 1996-09-26 Roland Man Druckmasch Offset-Gummituchhülse
EP0652104B1 (fr) * 1993-11-05 2002-04-10 MAN Roland Druckmaschinen AG Unité d'impression pour impression offset sans eau de mouillage
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
DE10055031A1 (de) * 2000-11-07 2002-05-08 Bobotex Hans Ladwig Gmbh & Co Wickelband für eine Walze
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
US7775159B2 (en) 2005-03-30 2010-08-17 Goss International Americas, Inc. Cantilevered blanket cylinder lifting mechanism
CN101208201B (zh) 2005-03-30 2011-10-05 高斯国际美洲公司 具有自动装版的卷筒纸胶印印刷机
WO2006104830A2 (fr) 2005-03-30 2006-10-05 Goss International Americas, Inc. Presse a imprimer offset sur papier sans fin pourvue d'une lame plieuse articulee
JP4814309B2 (ja) 2005-03-30 2011-11-16 ゴス インターナショナル アメリカス インコーポレイテッド ブランケット胴胴抜き支持面を有する印刷ユニット
JP4829291B2 (ja) 2005-04-11 2011-12-07 ゴス インターナショナル アメリカス インコーポレイテッド 単一モータ駆動を用いて自動プレーティングを可能にする印刷ユニット
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
EP2872333A4 (fr) * 2012-07-10 2016-05-25 Orora Packaging Australia Pty Ltd Appareil et procédé
WO2021096484A1 (fr) 2019-11-11 2021-05-20 Hewlett-Packard Development Company, L.P. Appareil d'apprêt

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0514344A1 (fr) 1991-05-14 1992-11-19 Heidelberg Harris Inc. Blanchet d'impression tubulaire sans fente
EP0715966A1 (fr) * 1991-05-14 1996-06-12 Heidelberg Harris Inc. Blanchet d'impression tubulaire sans fente
EP0571909A2 (fr) * 1992-05-29 1993-12-01 MAN Roland Druckmaschinen AG Blanchet pour l'impression offset
DE4320924A1 (de) * 1992-07-07 1994-01-13 Heidelberger Druckmasch Ag Druckgummituch mit Lärmdämpfung
EP0581019A1 (fr) * 1992-07-07 1994-02-02 Heidelberger Druckmaschinen Aktiengesellschaft Blanchet pour machine à imprimer en offset
EP0581018A1 (fr) * 1992-07-07 1994-02-02 Heidelberger Druckmaschinen Aktiengesellschaft Blanchet avec amortissement du bruit
DE4320923B4 (de) * 1992-07-07 2004-08-26 Heidelberger Druckmaschinen Ag Offsetdruckwerk mit einem hülsenförmigen Gummituch
DE4320924C2 (de) * 1992-07-07 2002-12-19 Heidelberger Druckmasch Ag Hülsenförmiges Druckgummituch mit Lärmdämpfung und seine Verwendung
FR2699110A1 (fr) * 1992-12-16 1994-06-17 Heidelberger Druckmasch Ag Presse d'impression lithographique offset.
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
DE4307320C1 (de) * 1993-03-09 1994-07-14 Roland Man Druckmasch Druckmaschine für indirekte Druckverfahren und Verfahren zur Herstellung einer mit einer Gummischicht oder einem Gummituch versehenen Hülse oder Platte
EP0631884B1 (fr) * 1993-05-04 1998-07-15 PT Sub, Inc. Elément sans fin anisotrope d'impression
EP0697284A3 (fr) * 1994-06-24 1997-01-02 Heidelberger Druckmasch Ag Minimisation de la déformation dans une presse lithographique
EP0699524B2 (fr) † 1994-08-30 2009-11-11 manroland AG Machine rotative d'impression offset à bobines
EP0727326B2 (fr) † 1995-02-16 2006-03-08 Sumitomo Rubber Industries Ltd. Blanchet d'impression
EP0974459A1 (fr) * 1998-07-20 2000-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Cylindre blanchet dans une machine rotative
FR2793440A1 (fr) * 1999-05-10 2000-11-17 Roland Man Druckmasch Machine a imprimer rotative comportant un cylindre porte- forme, un cylindre de transfert et un cylindre de pression
US6799512B2 (en) 2002-06-27 2004-10-05 Man Roland Druckmaschinen Ag Rubber cylinder sleeve for offset printing presses
GB2390059B (en) * 2002-06-27 2005-12-07 Roland Man Druckmasch Cylinder sleeve for offset printing presses
CN117962468A (zh) * 2023-12-27 2024-05-03 河南锦上源包装材料有限公司 一种印刷总成和改变印刷纸行进方向的方法

Also Published As

Publication number Publication date
ES2048915T3 (es) 1994-04-01
JP2569213B2 (ja) 1997-01-08
CA2026954C (fr) 1997-05-06
CN1050701A (zh) 1991-04-17
DE59003784D1 (de) 1994-01-20
EP0421145A3 (en) 1991-09-25
CN1026876C (zh) 1994-12-07
CA2026954A1 (fr) 1991-04-06
EP0421145B2 (fr) 1999-06-16
HK95394A (en) 1994-09-16
ES2048915T5 (es) 1999-11-01
JPH03128247A (ja) 1991-05-31
EP0421145B1 (fr) 1993-12-08

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