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EP1057627A2 - Machine pour imprimer et vernir - Google Patents

Machine pour imprimer et vernir Download PDF

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Publication number
EP1057627A2
EP1057627A2 EP00304715A EP00304715A EP1057627A2 EP 1057627 A2 EP1057627 A2 EP 1057627A2 EP 00304715 A EP00304715 A EP 00304715A EP 00304715 A EP00304715 A EP 00304715A EP 1057627 A2 EP1057627 A2 EP 1057627A2
Authority
EP
European Patent Office
Prior art keywords
cylinder
blanket
print
leading edge
recesses
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.)
Withdrawn
Application number
EP00304715A
Other languages
German (de)
English (en)
Other versions
EP1057627A3 (fr
Inventor
Robert Harry Wooles
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of EP1057627A2 publication Critical patent/EP1057627A2/fr
Publication of EP1057627A3 publication Critical patent/EP1057627A3/fr
Withdrawn legal-status Critical Current

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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
    • B41F21/12—Adjusting leading edges, e.g. front stops
    • 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
    • B41F21/10—Combinations of transfer drums and grippers

Definitions

  • This invention relates to printing and coating machines which apply printing ink or coatings to sheet material or substrates and, more particularly but not exclusively, to offset litho printing presses in which print is transferred from a blanket on a blanket cylinder to a sheet of metal supported on an impression cylinder.
  • each sheet to be printed is pushed by a conveyor into the pass gap between the blanket cylinder and the impression cylinder until it abuts a stop or register lay on the impression cylinder, whereon grippers mounted on the impression cylinder grip the leading edge of the sheet.
  • the stop or register lay is located so that the edge of the stopped sheet is ahead of the print on the blanket by a margin adequate for the grippers to act on.
  • the leading edge of the blanket cylinder is set back from the register lay and gripper mechanisms on the support or impression cylinder to avoid contact, resulting in the leading edge of the blanket which carries the image to be printed, falling some way short of the gripping mechanism and the leading cut edge of the sheet and hence being unable to transfer the images to the leading edge margin of the flat sheet which is being held by the gripping mechanisms.
  • This invention seeks to permit the printing of the image down to the leading cut edge except where the registration and gripping mechanisms intrude. Normally, the invention will be used with images which will accommodate the intruding mechanisms, such as staggered arrays of printed cap blanks or coated lids where the intrusions or missing image are not critical.
  • this invention provides a printing machine having a print cylinder to convey print or coating to a sheet material, an impression support in the form of an impression cylinder or an impression block to support the sheet material, means to stop the leading edge of the sheet material in register with the print or coating on the print cylinder, and means to grip the sheet material as it passes between the print cylinder and impression support, characterised in that recesses are provided in the leading edge of the print cylinder to accommodate the stop means and the gripper means as the cylinder rotates relative to the impression support.
  • the impression support may be a cylinder (when a rotary press is used) or a flat bed.
  • the print cylinder has, at one point of its circumference, a leading edge where the first part of the image to be printed is located on the cylinder.
  • the recesses may be formed directly in the material of the print cylinder, at the leading edge, or alternatively may be formed in an insert or inserts which can be fixed in suitable sockets in the cylinder.
  • Printing can be carried out with or without a blanket.
  • Inserts of appropriate shape permit change of the register lay and gripper positions to fit the array to be printed.
  • the print cylinder is in the form of a cylinder around which is fixed a printing blanket
  • the support means is in the form of an impression cylinder
  • the stop means or register lay is mounted on the impression cylinder to stop the leading edge of the sheet material in line with the start of the print or coating on the blanket.
  • the blanket follows the contours of the recesses and the stop means/register lay and grippers on the impression cylinder enter the recessed profiles on the leading edge of the blanket where the blanket overlies the recesses.
  • the printing blanket may be to a degree flexible and under tension may be deformed to adopt the shape of the profiled leading edge of the blanket cylinder.
  • Offset litho printing blankets are usually held under tension on their cylinders. Blankets under tension on their cylinders may be induced to adopt the shape of the recesses in the profiled leading edges with selectively placed cuts into or through the blanket material.
  • adhesive backed blankets eliminate the need for the tension and are cut according to the leading edge of the blanket cylinder and the recesses.
  • this invention provides a method of operating a printing machine comprising the steps of:
  • a printing blanket is stretched around the printing cylinder to drape the blanket into the profiled recesses, the impression support is an impression cylinder and the stop means and gripper means are mounted on the impression cylinder.
  • the blanket may be chosen to have thickness and resilience to accommodate the stop means and gripper means passing under it.
  • a typical thickness is about 1.9 mm.
  • Blankets are conventionally constructed of a rubber face layer supported on a woven backing layer.
  • the cylinders shown in these drawings are suitable for use in an offset litho press used for printing an array of blanks on sheet metal, such as tinplate or aluminium as used on drawn articles including caps, lids and can ends.
  • sheet metal such as tinplate or aluminium as used on drawn articles including caps, lids and can ends.
  • Each sheet of metal brought by a conveyor is pushed in between the contra-rotating blanket cylinder and impression cylinder to abut a stop which registers it with decoration on the blanket.
  • the leading edge of the sheet is gripped before printing while the cylinders continue to rotate.
  • inking rolls transfer ink from a reservoir to a printing plate on a printing cylinder.
  • the printing plate transfers an inked image to the blanket on the blanket cylinder, which in turn applies the image onto the metal.
  • This description is limited to the blanket cylinder, the impression cylinder and the decorative layout of the sheet as the remainder of the printing apparatus will be familiar to those skilled in the art.
  • Figure 1 shows a blanket cylinder 1 and an impression cylinder 2 which, when in use, are supported for contra-rotation in bearings which hold the cylinders apart at a distance substantially equal to the thickness (m) of a sheet (shown by dashed lines) to be printed.
  • Each cylinder has a drive gear 3 and when the gears 3 are meshed together they ensure synchronised rotation of the cylinders.
  • the cylinder surface of the blanket cylinder 1 has a cavity 4 extending the length of the cylinder from a gear side flange 5 to an opposite flange 6.
  • a pair of blanket tensioner rods 7, 8 are supported between flanges 5 and 6 to span the length of the cavity 4. This much is conventional.
  • the blanket cylinder 1 has gaps or sockets 10 in a front or leading edge 9, into each of which is fixed a profiled insert 11.
  • the insert 11 is shown on an enlarged scale in Figure la, to show details of three recesses 20, 21 and 22 in the leading edge of the insert. When the insert is in place (held by socket head screws 12) the leading edge of the insert is aligned with the leading edge of the cavity 4.
  • the cylindrical wall of the impression cylinder has a cavity 14 extending from an end flange 15 near gear 3 to an opposite end flange 16.
  • a rod 17 extends between the gear-side flange 15 and the other flange 16 to support stop means or register lays 18 and sheet grippers 19.
  • the recesses 20 and 22 in the insert 11 are of a size to accommodate the grippers 19 as the cylinders rotate, while recess 21 is of a size to accommodate the register lay 18.
  • Figure 2 shows one side of the front edge of the blanket cylinder 1 with part of a blanket 23.
  • the blanket is stretched by a tensioner 8 so that it is deflected into the recesses 20, 21, 22 in the blanket cylinder insert 11, as indicated at 24.
  • Figure 3 shows the front edge 9 of the blanket cylinder 1 and the front edge 25 of impression cylinder 2 near their meeting point, with the grippers 19 and register tip 18 on the impression cylinder 2 about to fit into the deflected areas 24 over the recesses 20, 21 22 on the front edge 9 of the blanket cylinder 1. From this position, the front edge 25 of the impression cylinder 2 then moves to pass the front edge 9 of the blanket cylinder.
  • Figure 4 shows printed images 26 extending to the front cut edge A of the sheet 27 between the grippers 19 and the register lay 18.
  • each spent image 28 on the blanket 23 lies between the recesses 20, 21, 22 and the leading edge 9 of the blanket cylinder.
  • Figure 5 shows a fragment of a printed sheet 27 on which the leading row of printed blanks are denoted 26, the periphery of each blank reaching substantially the edge A of the sheet.
  • the prior art limit to the gripper margin is denoted B so that the areas now available, by virtue of the invention are generally denoted C. Only the areas denoted D are not now available for print or coating because space is needed for grippers 19 and register lay 18.
  • register lay 18 is adjustable laterally, and grippers 19 and register lay 18 may be moved along rod 17 to fit between images in a multi-image array.
  • Figure 6a shows end views of a prior art blanket cylinder 1 and impression cylinder 2.
  • Figure 6b shows corresponding views of cylinders 1,2 according to the invention.
  • printing does not start until the sheet m has advanced far enough for the register lay 18 and grippers 19 which operate on the leading edge of the sheet m to clear the approaching free edge 9 of the blanket cylinder.
  • printing can start right at the edge of the sheet m by virtue of the relieved blanket cylinder insert at 11 which allows register lay 18 and grippers 19 to pass under the blanket cylinder 1, with the front edge 25 of the recess in the impression cylinder 2 being substantially in line with the leading edge 9 of the blanket cylinder at the start of printing.
  • Figure 7 shows part of a blanket cylinder where the recesses 20, 21 or 22 are cut directly into the metal of the cylinder.
  • Figure 7a shows how the blanket 23 (under tension from a tensioner 8) can have a cut or cuts 34 cut in from the front edge of the blanket to assist in the deflection (stretching) of the blanket into the respective recesses 20, 21, or 22 in the leading edge 9 of the blanket cylinder 1.
  • Figure 8 shows one side of the front edge of the blanket cylinder 1 with an adhesive backed blanket 23. This needs no tension from a tensioner 8, so the blanket is not deflected into recesses 20, 21, 22 in the blanket cylinder. Instead the blanket is shaped along the front edge 9 to conform to the profile of the recesses 20, 21, 22 of the insert 11. Numeral 33 indicates the adhesive layer on the underside of the blanket 23.
  • Figure 9 shows the front edge 9 of the blanket cylinder 1 and the front edge 25 of impression cylinder 2 near the meeting point with the grippers 19 and register tip 18 on the impression cylinder about to fit into the recesses 20, 21, 22 on the front edge 9 of the blanket cylinder 1 as the front edge 25 of the impression cylinder passes the front edge 9 of the blanket cylinder.
  • 23 shows the adhesive blanket cut to the profile of the front edge 9 of blanket cylinder 1 and cut to the profiles of the recesses 20 and 21.
  • the blanket is prepared with a cut leading edge placed substantially in line with the leading edge of the blanket cylinder 9.
  • Recesses are cut into the leading edge of the blanket substantially in line with the recesses in the blanket cylinder.
  • this invention permits printing or coating of a sheet right up to its leading edge in a single printing pass, so avoiding the expense of an extra step, such as rotating through 180 degrees and printing a second pass to complete the printed array; or an ink jet spray; or a tampo type dab; as would otherwise be needed to complete the array.

Landscapes

  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Rotary Presses (AREA)
EP00304715A 1999-06-03 2000-06-02 Machine pour imprimer et vernir Withdrawn EP1057627A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9912830.8A GB9912830D0 (en) 1999-06-03 1999-06-03 Printing and coating machines
GB9912830 1999-06-03

Publications (2)

Publication Number Publication Date
EP1057627A2 true EP1057627A2 (fr) 2000-12-06
EP1057627A3 EP1057627A3 (fr) 2002-05-22

Family

ID=10854617

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00304715A Withdrawn EP1057627A3 (fr) 1999-06-03 2000-06-02 Machine pour imprimer et vernir

Country Status (2)

Country Link
EP (1) EP1057627A3 (fr)
GB (1) GB9912830D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008084191A1 (fr) * 2007-01-08 2008-07-17 Oft-Technology Limited Revêtement lithographique
DE102007010481A1 (de) * 2007-03-03 2008-09-04 Koenig & Bauer Aktiengesellschaft Bogenrotationsdruckmaschine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19647068A1 (de) * 1996-02-09 1997-08-14 Heidelberg Harris Sa Verschiebbarer Anschlag an produktführenden Zylindern in Rotationsdruckmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19647068A1 (de) * 1996-02-09 1997-08-14 Heidelberg Harris Sa Verschiebbarer Anschlag an produktführenden Zylindern in Rotationsdruckmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008084191A1 (fr) * 2007-01-08 2008-07-17 Oft-Technology Limited Revêtement lithographique
DE102007010481A1 (de) * 2007-03-03 2008-09-04 Koenig & Bauer Aktiengesellschaft Bogenrotationsdruckmaschine
DE102007010481B4 (de) 2007-03-03 2018-12-20 Koenig & Bauer Ag Bogenrotationsdruckmaschine

Also Published As

Publication number Publication date
EP1057627A3 (fr) 2002-05-22
GB9912830D0 (en) 1999-08-04

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