Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F7/00—Rotary lithographic machines
  • B41F7/02—Rotary lithographic machines for offset printing
  • B41F7/12—Rotary lithographic machines for offset printing using two cylinders one of which serves two functions, e.g. as a transfer and impression cylinder in perfecting machines
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F7/00—Rotary lithographic machines
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F7/00—Rotary lithographic machines
  • B41F7/02—Rotary lithographic machines for offset printing
  • B41F7/10—Rotary lithographic machines for offset printing using one impression cylinder co-operating with several transfer cylinders for printing on sheets or webs, e.g. satellite-printing units

Definitions

• the invention relates to a printing press according to the preamble of claims 1 or 7.
• Printing machines which use different techniques such as high pressure, gravure printing, offset printing, etc., are known in large numbers.
• Printing machines for multicolor printing generally have a plurality of pairs of cylinders which delimit a printing nip and which are arranged one above the other in order to save floor space when setting up the machines.
• These arrangements also known as pressure towers, reach heights of several meters, which require a corresponding hall height to accommodate them. Despite their small footprint, the installation of such machines is therefore associated with considerable costs.
• DE 198 05 898 A1 discloses a printing press with horizontally arranged cylinders, which is used in one embodiment for horizontal path and in another embodiment for vertical path.
• DE 101 19 678 C1 shows a rotary tampon printing machine with a vertical engraving roller and a vertical tampon roller.
• US 3 903 793 A describes a franking machine with a vertical printing roller.
• the invention has for its object to provide a printing press.
• the advantages that can be achieved with the invention are, in particular, that it allows space-saving installation even with a low hall height.
• This advantage is achieved by vertically aligning the axes of the cylinders of the printing press.
• the height of the printing press is therefore limited by the width of its cylinders and by frame parts which are located above and below the cylinders and which are required to hold and drive them.
• an inking unit with a chamber doctor blade is preferably used.
• At least one of the cylinders of the printing press is supported in a stable manner on a lower frame part.
• a strong support plate is required to support the cylinders.
• a drive unit which must be firmly supported for rotating the cylinders, is preferably arranged under the support plate and anchored to it or to the floor.
• an upper part of the frame which serves to guide the upper ends of the cylinders during operation, can be made much lighter.
• the upper frame part preferably comprises a frame with at least one opening through which the cylinder can be moved, and at least one bushing element which is detachably fastened in this opening and which holds the cylinder.
• the cylinder can be easily replaced after removing the bushing element.
• printing machines with horizontal cylinders generally use paper feed devices with two strands that grip a paper web to be drawn in at both edges
• a single-strand paper feed device from which the paper web can hang is sufficient.
• a plate cylinder of the printing press can have a stop for printing plates at its lower end. At this stop, a pressure plate reliably comes into contact with the system without any additional adjustment effort, simply due to its own weight.
• the printing press preferably has a plurality of printing columns arranged on a common straight line.
• the straightness not only simplifies the drawing of a paper web between the printing columns, but also eliminates the need for deflection rollers between the printing columns, which could impair the printed image in contact with freshly printed ink.
• Figure 1 is a schematic plan view of printing units of a printing press according to the invention.
• FIG. 3 shows a section along the axis designated by III-III in FIG. 1;
• FIG. 4 shows an enlarged detail from FIG. 3.
• Fig. 1 shows a schematic section through three printing units of an offset printing press in a horizontal plane.
• Each printing unit 01 comprises two blanket cylinders 02, which delimit a printing gap through which a material web 03 to be printed, in particular a paper web 03, is guided, two forme cylinders, e.g. B. plate cylinder 04 and two inking units 06.
• the impression cylinder forming a pressure gap with the blanket cylinder can also be designed, for example, as a steel cylinder or as a satellite cylinder.
• the forme cylinders 04 are provided, for example, with planographic printing plates or high-pressure plates, in the exemplary embodiment with two or four printing plates in the axial direction. However, a single pressure plate is also possible.
• the inking units 06 comprise a chambered doctor blade 07 shown in detail in FIG. 2, an anilox roller 08 rotating in contact with the chambered doctor blade 07 and receiving ink therefrom, and a plurality of friction and transfer rollers 09 which transfer ink from the anilox roller 08 to the plate cylinder 04 ,
• the forme cylinder 04 can also be inked directly by the anilox roller 08.
• at least one additional inking roller 09 is arranged between the forme cylinder 04 and the anilox roller 08.
• all cylinders and rollers have vertical axes.
• the cylinders are therefore not bent under their own weight as in the case of horizontal suspension, so that a very even pressure distribution in the pressure gap between the rubber blanket cylinders 02 can be achieved.
• Halves of each printing unit 01 lying on the side of the paper web 03 are exactly symmetrical, so that identical printing properties on the front and back of the paper web 03 are easy to achieve.
• the chamber doctor blade 07 shown in section in FIG. 2 has a channel-like housing 11 which is extended at two longitudinal edges by flexible lips 12.
• the chamber doctor blade 07 thus has a working doctor blade and a closing doctor blade 12 in the example.
• the lips 12 touch the surface of the anilox roller 08 during operation, so that the housing 11 and the anilox rollers 08 delimit a closed chamber 13 filled with ink.
• the lips 12 press firmly against the outer surface of the anilox roller 08, so that the hydrostatic pressure of the ink in the chamber 13 is not sufficient to spread the lips 12 and allow ink to escape.
• the only way in which ink can leave the chamber 13 is by penetrating wells on the surface of the anilox roller 08 which are not wiped clean when the lips 12 pass through.
• the hydrostatic pressure of the paint is essentially unchangeable over the height of the chamber 13. This is e.g. achievable in that the paint is continuously pumped around in the chamber 13.
• a rotating screw 14, which is arranged in the rear region of the housing 11, extends over the entire height of the housing 11 and communicates with the upper and lower ends of the chamber 13 via a passage 16 ,
• a dynamic pressure distribution in the chamber 13 can be achieved which compensates for the gradient of the hydrostatic pressure.
• FIG. 3 shows a schematic section through the printing press along the plane labeled III-III in FIG. 1.
• the machine has a frame with a strong lower one
• Plate 17 the weight of the cylinder 02; 04 and the inking units 06 (not shown) and which is spaced from the floor by feet 18, so that 17 space for z.
• B. position-controlled motors 19 for directly driving the cylinders 02; 04 is present.
• a plurality of round sleeves 21 are inserted, which are rotatable relative to the plate 17 and slightly eccentrically each one journal 22 of the cylinders 02; Record 04.
• the resulting horizontal mobility of the cylinders 02; 04 makes it possible to set pressures between them as required or to move them apart, for example to pull in a new paper web or to change plates.
• the cylinders 02; 04 are supported on the sleeves 21 via axial roller bearings 23, which hold them in a vertical position even when the upper journal 24 of the cylinder 02; 04 are not held in an upper plate 26 of the frame.
• This upper plate 26 comprises a frame 28 which is supported by vertical struts 27 on the lower plate 17 and an insert 29 which fills an opening in the frame 28 and which holds the upper axle journals 24.
• This insert 29 (which can also be in several parts) covers the upper end faces of the cylinders 02; 04 completely so that, when removed, they can be lifted out of the frame.
• a paper feed device 31 for feeding a new paper web into the printing press comprises a single rail, shown in section in FIG. 3, which is fastened to the upper plate 26 and guides a chain provided with grippers.
• Fig. 4 shows an enlargement of the section marked IV in Fig. 3 in section.
• the plate cylinder 04 has a lower end plate 32, the diameter of which is greater than the diameter of its lateral surface 34 by less than the thickness of the shaping plate 33.
• the projection of the lower end plate 32 over the lateral surface 34 thus forms a stop which serves as a reference for the positioning of the Form plate 33 is used.
• the mold plates 33 of which several are generally in the longitudinal direction of the cylinder, here in the vertical direction

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Inking, Control Or Cleaning Of Printing Machines (AREA)
• Rotary Presses (AREA)
• Glass Compositions (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Photoreceptors In Electrophotography (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 2003
  • 2003-05-02 DE DE10319772A patent/DE10319772B4/de not_active Expired - Fee Related
• 2004
  • 2004-01-28 EP EP04705819A patent/EP1620263B1/fr not_active Expired - Lifetime
  • 2004-01-28 WO PCT/EP2004/050049 patent/WO2004096544A1/fr active IP Right Grant
  • 2004-01-28 AT AT04705819T patent/ATE343478T1/de not_active IP Right Cessation
  • 2004-01-28 DE DE502004001852T patent/DE502004001852D1/de not_active Expired - Fee Related

Non-Patent Citations (1)

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