Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41F—PRINTING MACHINES OR PRESSES
  • B41F21/00—Devices for conveying sheets through printing apparatus or machines

Definitions

• the invention relates to a device according to the preamble of patent claim 1
• DE 19921271 AI discloses a method for conveying sheets in a printing press and a device for carrying out the method. In this case, it is provided on the sheet-guiding elements, instead of providing areas covered with adhesive by grippers, which enable the sheets to be guided in a secure position.
• a printing press is also described here, which enables the straight-forward transport of printing materials by means of a conveyor belt.
• holding the sheet by means of electrostatic charges is not sufficient for the transportation of the sheets.
• the aim of the invention is to provide a variable transport device that can be used in a variety of printing machines. Furthermore, a holding device for the printing materials is to be provided there, which always enables the same conditions for their transport.
• the object of the invention is therefore to provide in a device according to the preamble of claim 1 a machine configuration with a flexible and improved transport device for printing substrates of all kinds and in particular a preferably straight sheet transport without the use of grippers.
• the solution to the problem is based on the characterizing feature of claim 1.
• the machine configuration allows the transport of a wide variety of substrates according to shape, size and material composition.
• Renewable holding areas on a conveyor belt are preferably provided as holding means for sheet-shaped printing materials. This enables the same conditions to be maintained for all sheets to be transported via a print job. It also avoids the need to introduce electrostatic charges.
• this device is suitable for a wide variety of substrates.
• Advantageous refinements are described in the subclaims in that holding means in the form of adhesive films, meltable adhesive areas, variable adhesive strips, offset press devices, rolling devices or clocked roller transports.
• FIG. 1 shows a web-fed rotary printing press in a standard configuration
• FIG. 2 shows a printing press of the same configuration with a conveyor belt and holding belts
• FIG. 3 shows a printing press of the same configuration with a conveyor belt and pressure rollers
• Figure 5 shows a printing machine according to Figure 2 in plan view.
• FIG. 1 shows a web-fed rotary printing press with a plurality of printing units 1 to 4, which in the basic configuration has an impression cylinder 7, a blanket cylinder 6 and a forme cylinder 5.
• the printing material web 8 is
• the printing material web 8 is fed to a take-up roll 11 and rewound there.
• the printing press described is therefore an offset printing press.
• FIG. 1 it has no so-called Gurnmi against Gu mi printing units, but each printing unit 1 4 to 4 are each provided with an impression cylinder 7, which only serves to press the printing material against the imaging cylinder, here the blanket cylinder 6.
• the impression cylinders 7 have a smaller diameter than the blanket cylinders 6 and the forme cylinders 5. This is possible because each impression cylinder 7 has a purely supportive function.
• the registration of the print images of the various printing units 1 to 4 to one another can be carried out by means of the deflecting rollers 20 or other devices, for example so-called web tensioning devices.
• FIG. 2 shows a printing press of the same basic configuration as shown in FIG. 1.
• a conveyor belt 40 known per se for printing materials is guided over the area of the impression cylinders 7.
• the path of the conveyor belt 40 is flat and leads through the printing zones of all printing units 1 to 4 between the respective blanket cylinders 5 and the impression cylinders 7.
• Both printing material webs and printing material sheets can be placed on this conveyor belt 40.
• Printing material sheets are fed in front of the printing unit 1 by means of a sheet feeder 30 from a feeder stack from a feed station 41 to the conveyor belt 40, removed from the feeder belt 40 at a feeder station 48 and placed in a feeder 31 on a delivery stack.
• the printing material sheets are held on the conveyor belt 40 by means of suitable means while they pass through the printing zones of the printing units 1 to 4.
• Printing on a printing material web can provoke problems with the substrate, since the substrate in the printing zone only adheres to a colored cylinder on one side. Appropriate guidance on the conveyor belt 40 solves this problem in a simple manner.
• FIG. 2 For this purpose, the holding of the printing material on the conveyor belt 40 by means of holding belts 42 is described in FIG. 2.
• a parallel guidance of the conveyor belt 40 and holding belts 42 is provided in the area of the printing material pass.
• the holding bands 42 are returned above the printing units 1 to 4 in a closed system.
• Tensioning devices 43 can be provided in the area of the holding straps 42.
• the printing material is transported in that at the beginning of the conveyor belt 40 there is a catch roller for the holding belts 42, which is clocked and movable in the vertical direction.
• an inlet gap 44 for the printing material to be transported can be produced at the feed station 41, so that the printing material is controlled and adjustable between the
• Retaining straps 42 and the conveyor belt 40 can be inserted. After the printing material has been introduced sufficiently far, the holding belts 42 can be lowered and consequently grasp the printing material, so that it is held on the transport belt 40 in a frictional manner and is carried along by it. For a guide roller 45 at the end of the inlet nip 44, the printing material is properly conveyed to the conveyor belt 40 and placed on the conveyor belt 40 for printing.
• the tether or straps 42 may be in the form of magnetic tapes. These work together with a corresponding counter surface on conveyor belts 40. A firm static friction between the printing material and the conveyor belt 40 is thereby achieved.
• the printing material is fixed on the conveyor belt 40 and can be on the straight or flat Transport route through the printing units 1 to 4 are safely guided.
• a station 46 is provided to influence the supply of printing material. This can be designed as a measuring and / or alignment device 46 or as an electrostatic device. The position of the printing material can be registered, aligned or provided with electrostatic charging or freed from electrostatic charging. All measures support proper printing.
• FIG. 5 a plan view of the transport path of printing material sheets 50 through such a printing machine is shown in a manner corresponding to the representation according to FIG. 2.
• the holding straps 42 lie laterally on the printing material sheets 50.
• the printing material sheets 50 are free of printed images
• Edges 47 held while the printed areas in the. Center of the substrate sheet 50 are not covered. It is also conceivable to use holding straps 42 in the middle of the transport path if unprinted areas are provided in the print subject at this point.
• FIG. 3 shows a printing press of the same basic configuration as shown in FIG. 1.
• special conveyor belts 40 are provided, against which pressure rollers 60 are shown.
• the printing material is rolled onto the conveyor belt 40 by means of the pressure rollers 60 and is fixed there in this way.
• the holding force of the conveyor belt 40 can be configured favorably with respect to the printing material by a corresponding choice of material for the conveyor belt 40.
• different materials can be available for the conveyor belts 40.
• the pressure rollers 60 work together with a fixed counter surface 61 and serve to squeeze out air present between the printing material and the conveyor belt 40. at the use of film-like materials usually suffices to provide an equally smooth conveyor belt 40. Sufficient adhesion is thereby achieved when the printing material is pressed on by means of the pressure rollers 60.
• the position of the printing material before it is fed to the first printing unit 1 is to be detected by means of a measuring device and, if necessary, to be aligned. This can be done by guiding the conveyor belt 40.
• the conveyor belt 40 can be adjusted in the longitudinal direction and in the transverse direction on its path through the printing units 1 to 4.
• the printing material can also be pressed onto the conveyor belt 40 in the correct position between the printing units 1 to 4 by means of further pressure rollers 62 in order to ensure adhesion to the conveyor belt 40.
• the guide surfaces 61 provided below the conveyor belt 40 serve to smoothly support the printing material.
• the pressure rollers 62 should be provided with an ink-repellent surface.
• dry substances can also be introduced into the printed image applied to the printing material via the pressure rollers 62.
• FIG. 4 shows a further printing machine of the same basic configuration according to FIG. 1.
• the printing material is held on the conveyor belt 40 by means of an air stream.
• a pneumatic is before the printing material runs into the printing zone of the first printing unit 1 Press device 70 provided.
• This can be arranged in the manner of a slot-shaped blowing device over the entire width of the printing material.
• the pneumatic pressing device 70 should achieve the highest possible pressing force.
• it can be provided that the pneumatic pressing device 70 spreads the printing material outwards from the center.
• intermediate drying of the printed images can be achieved by means of the pneumatic pressing devices 71 to 73.
• it can be useful to supply the pneumatic pressing devices 71 to 73 with preheated air.
• the adhesion of the printing material to the conveyor belt 40 can be supported by additional means such as a releasable adhesive.
• a releasable adhesive can be provided here in the area of the supply of printing material sheets to represent a station for connecting the printing material to the conveyor belt 40 in such a way that areas provided with an adhesive connection are provided in the conveyor belt 40. These areas can be used to apply the printing material are melted onto their surface by means of a heating station, as a result of which the printing material can then adhere particularly well and firmly.
• the printing material can be dispensed at the outlet side by reheating the adhesive areas.
• the devices shown it is possible, in a printing press whose configuration is suitable for web printing, to also process sheet-shaped printing materials.
• the variants for adhering the printing material to the conveyor belt 40 are all advantageous in that they always bear the same conditions of detention.
• a renewal of the conditions of detention is not easily possible.
• such procedures are not at all suitable for certain printing processes, for example wet offset printing.
• the renewability of the detention conditions is such that, for example, the adhesive films can be cleaned continuously and are thus free of paper dust.
• the meltable adhesive always provides the same conditions of detention.
• the adhesion of the printing material can be continuously monitored and sustainably improved by means of the pressure rollers 60, 62 or the pneumatic pressure devices 70 to 73.
• the printing press described offers possible applications for the printing processes currently known. The limitation to conventional offset printing should not apply here.
• the type of substrate transport is also not limited to the known printing processes. All processes can be used, from planographic printing to gravure printing and high pressure. Both direct and indirect printing processes can be used. So-called digital printing processes can also be used, in which printing forms are created in the machine.
• inking methods can be used in the printing press, with the orientation having to be based on the required print quality. Therefore inking methods from the area of sheet printing can be used as well as from the area of web printing. In digital printing machines in particular, the use of special inking methods based on toner, both in dry and in liquid form, is conceivable and possible.
• the printing press can also be designed according to current design principles, the use of sleeve-shaped printing forms or printing blankets or other cylinder coverings being considered.
• a configuration can be provided for the machine configuration, in which the cylinders forming the pressure gap are arranged such that they can be adjusted linearly or in an arc shape relative to one another.
• This has the advantage that the assignment of the printing elements can be done in a simple manner. It is then not necessary to convert the printing units when changing the process or type of substrate.
• the use of individual drives for all known printing element elements is particularly favorable. It is conceivable that the sheet feeder 30 is driven separately. This means that substrate sheets can be fed to the printing press in a much more targeted manner.
• format-independent printing processes for web-shaped substrates are also possible.
• Forme cylinders are controlled so that the printing material web is nevertheless printed in full length.
• the substrate can be moved in simple steps. While the forme cylinders rotate evenly, the conveyor belt is only moved when a print image is to be transferred. If they did not print images
• Printing unit 2 Printing unit 3
• Sheet feeder 30 Sheet feeder 31

Landscapes

• Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
• Gas-Filled Discharge Tubes (AREA)
• Pinball Game Machines (AREA)
• Production Of Multi-Layered Print Wiring Board (AREA)
• Rotary Presses (AREA)
• Ink Jet (AREA)
• Printing Methods (AREA)
• Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
• Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
• Printers Characterized By Their Purpose (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7642069

Family Applications (1)

Country Status (11)

Families Citing this family (12)

Family Cites Families (13)

• 2000
  • 2000-05-16 DE DE10023689A patent/DE10023689A1/de not_active Withdrawn
• 2001
  • 2001-04-28 DK DK01929608T patent/DK1286835T3/da active
  • 2001-04-28 CA CA002409023A patent/CA2409023C/fr not_active Expired - Fee Related
  • 2001-04-28 AT AT01929608T patent/ATE377508T1/de active
  • 2001-04-28 CN CNB018096468A patent/CN1230298C/zh not_active Expired - Fee Related
  • 2001-04-28 CZ CZ20023595A patent/CZ20023595A3/cs unknown
  • 2001-04-28 DE DE50113233T patent/DE50113233D1/de not_active Expired - Lifetime
  • 2001-04-28 EP EP01929608A patent/EP1286835B1/fr not_active Expired - Lifetime
  • 2001-04-28 JP JP2001584040A patent/JP2003533418A/ja not_active Withdrawn
  • 2001-04-28 US US10/276,384 patent/US6925932B2/en not_active Expired - Fee Related
  • 2001-04-28 AU AU2001256328A patent/AU2001256328A1/en not_active Abandoned
  • 2001-04-28 WO PCT/EP2001/004801 patent/WO2001087610A1/fr not_active Ceased

Non-Patent Citations (1)

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