FR2626814A1 - PRINTING MACHINE, PARTICULARLY FOR POLYCHROME PRINTING - Google Patents

Abstract

Printing machine characterized in that the printing paper transport system takes the form of a central printing cylinder 4 cooperating with the printing paper discharge and the printing paper supply, a cylinder antagonist 12 being associated with each impression cylinder 9, and the printed proof transfer element, being realized in the form of a printed proof collecting element 7 in the form of an endless band, being in contact with the central impression cylinder 4 and being guided through the pressure zone between at least one impression cylinder 9 and at least one counter cylinder 12.

Description

. "'printer, especially for printing poy chrome.

  The invention relates to a printer, in particular

ment for I polychrome limpressibn.

  A sheet printing machine is known (DE 32 03 948) in which the rubber cylinders of the different printing groups are

  touching for transfer of incret are arranged-

  in rows and a cylinder which constitutes at the same time, 0 the input drum and the return system of the circuit

  transfer chain, .is likely to be app1- -

  against a rubber cylinder: the disadvantage in this case is that for the

  transfer of printed eprints, many-so> 1u--

  inking continuity requirements are necessary, - which--

  cause a magnification of points, phnomenes

  smudging and therefore a loss of quality. In these mat-

  chines, moreover, because of the large number,

  that is to say the average of continuity solutions, a regulation of the ink layer as a function of the different length path of the ink until the transfer of the ink onto the printing paper, is problematic .: Due to the aforementioned drawbacks, this design

  of machine is not applicable l of moder-- machines

  nes with a large number of printing units, for example,

  example to a ten color machine.

  The object of the invention is to increase the quality of printing, to simplify the guidance of

  sheets, and thereby increase the capacity of im-

  pressure. The problem posed to the invention is to create a printer according to the principle of the transport of proofs, a printer comprising a reduced number of

  ink continuity solutions and who is susceptible to

  ble to be equipped with a large number of im-

  pressure. According to the invention this problem is

  solved in the case of a printer with a feeder

  printing paper, a printing paper transport system 3 and a paper outlet

  printing, with at least one cylinder of printing form

  pressure comprising an inking device and a device

  positive wetting, and with at least one element of

  transfer of printed proofs in contact with the cy-

  printing form liner, in that the printing paper transport system takes the form of a

  central impression cylinder cooperating with the evacua-

  tion of printing paper and paper feed

  impression pier, an opposing cylinder being associated

  attached to each impression shape cylinder, and the ele

  transfer of the printed proofs being carried out

  in the form of a collector of imitations

  award-winning in the form of an endless band, being in contact with the central printing cylinder and being guided through the pressure zone between at least one impression-shaped cylinder and at least one opposing cylinder. The central printing cylinder takes the form of a central printing guiding cylinder.

  sheets with at least one film picking system

26268 4

  the. In this case, at least one cylinder of im-

  pressure with anchoring device and wetting device is arranged above the upper strand -of the collecting element of printed proofs, or else at the joints a shaped cylinder. printing unit is arranged below the lower strand of the collecting element

  of printed proofs, or even at least one cy-

  printing form liner with inking device

  and mooring is arranged above the upper strand

  rieur-de 1 collecting element of printed proofs, while at least one cylinder of form of impression with anchoring device and wetting device is arranged below the lower strand of the collecting element of printed proofs To the central cylinder d sheet guide printing is associated with another collector of printed proofs with at least one impression-shaped cylinder comprising an anchoring device and a wetting device, and

an opposing cylinder.

  The central impression cylinder for tape guiding is associated with a proofing element

  printed with at least one cylinder of dimpres forzme-

  sion comprising an inking device and a device

  wetting anchor and an opposing cylinder.

  The printed proof collector element takes the form of an offset printing blanket or

  well at least one off-print blanket

  set takes the form of an offset printing blanket or at least one piece of offset printing blanket is connected to the proofing element

  printed, or the proofing element: ix-

  The award-winning includes at least one gripping system for a section of offset printing blanket. The invention will be explained in more detail below with reference to an exemplary embodiment in the attached drawings:

  - Figure 1 shows a printing machine -

  sheet printing with upper strand printing units, - Figure 2 shows a sheet printing machine with lower strand printing units,

  - Figure 3 shows a printing machine -

  sheet printing - with upper and lower strand printing units,

  - the. figure 4 shows a printing machine

  sheet printing with double printing units

ble strand,

  - Figure 5 shows a printing machine -

  roller printing (simplified printing unit).

  The printer according to the invention in its embodiment in the form of a sheet printing machine, consists of a sheet transport system and a proof transport system

printed.

  The sheet transport system consists (figures 1 to 4) of a paper feed

  printing with a feeder 1, a feeding table

  tion 2 and a sheet transfer 3, for example a pre-picking device, a printing paper transport system in the form of a cylinder

  4.1 sheet guide printing central

  posed following the transfer of sheets ,. and an eva-

  cuation of printed proofs in the form of a

  sheet transfer device 5.

  The central printing and guiding cylinder

  sheet feeding 4.1 has two pick-up systems 6, the number of which can be

increased or decreased.

  The printer according to the invention in its

262 681 4

  production. in the form of a printer & rollersc consists of a tape guide system and a system for transporting printed proofs .: The tape guide system - (figure 5)

  consists of a supply of printing paper - -

  sion with an unwinder 22 and a feed roller: in strip 23, a central printing cylinder and

  tape guide 4.2, and dune- paper evacuation -

  printing device in the form of a reel 24 with

  tape guide rollers 25.

  The transport system for printing

  mées consists, on the one hand, of a collector element.

  proof maker 7, which takes the form of a

  endless belt guided by two wheels

  return water 8 and which is in contact with the cylinder

  dre of central printing 4. Furthermore, the system for transporting printed proofs is made up of at least one printing group, this printing group consists of a cylinder of printing form 9

  with inking device 10 and wetting device

  ge 11, as well as an opposing cylinder 12. The strand

  upper 13 of the print proofing element

  mées 7 covers the contact area between the cylinder -

  of impression form- 9 and the opposing cylinder 12

(figure 1).

  At least one drying device 15 acts on the central printing cylinder 4 and on the element

  collector of printed proofs acts at least one

  washing positive 16 and a bubble sensor 17.

  The printed proofs collector element 7 takes the form of an endless offset printing blanket 18 (FIG. 3), or at least a part 19 of a blanket. of offset printing is connected with the collector of printed proofs 7, 'in which case, when' 35. several pieces of offset printing blanket are connected to the collector of printed proofs, an intermediate space for the socket system 6 is

expected (Figure 1).

  The printed proof collector element 7 can also consist of at least one section 21

  offset printing blanket transported on a sys-

  plug 20 by an anterior edge or by an anterior edge and a posterior edge and / or by

  side edges (figure 2). In Figure 2 is shown

  an embodiment in which the printing units consisting of a printing form cylinder 9 with inking device and wetting device (10; 11) and an opposing cylinder 12, are in contact with the strand lower element 14

collector of printed proofs.

  FIG. 3 shows an embodiment in which a first quantity of

  printing units is in contact with the upper strand

  of the collector of printed proofs 7,

  while a second quantity of printing groups

  sion is in contact with the lower strand of the element

  print collector 7.

  In figure 4 is represented another

  embodiment in which another element.

  collector of printed proofs 7 'with the corresponding printing groups, is associated with the cylinder

  sheet guide printing central 4.1.

  In Figure 5 is shown a form of

  embodiment in which a collector element of

  printed evidence 7 is associated with the central cylinder

  printing and tape guiding 4.2.

  How the printer works

  according to the invention will be described below.

  The sheet taken by the feeder 1 is brought to the central printing cylinder 4 via

7 TO:

  feed table 2 and sheet transfer

  3. After printing, the ink applied to the

  sheet is dried using dryer 15 and the foil

  it is brought to the evacuation stack by means of sheet transfer 5. The printed proof collecting element 7 traverses the printing area between the printing form cylinder 9 and the opposing cylinder 12 of the

  first printing group and supports the

  proof printed with the first color.

  Correspondingly to the number of groups

  printing weights, other colors are applied-

  in the same way. The complete colored image is transferred to the sheet during the course of the printing area between the central printing cylinder 4

  and the print proofing element 7.

  The advantages of this system lie in the

  easy transport of the sheets and in a

  pressure with very few smear problems, given the small number of continuity solutions

inking.

Claims (1)

4 TREVENDICATIONS   1.- Printer with a paper feed   printing pier, a printing paper transport system and a printing paper outlet, with at least one printing form cylinder (9)   comprising an inking device (10) and a device   anchor (11), and with at least one element of   transfer of printed proofs in contact with the cy-   print form liner, characterized printer   in that the paper transport system.   sion takes the form of a central printing cylinder (4) cooperating with the discharge of printing paper and the supply of printing paper, an opposing cylinder (12) being associated with each cylinder in the form of printing (9), and the transfer element of the printed proofs being produced in the form of a   collector element for printed proofs (7) in the form   endless band, in contact with the cy-   central printing liner (4) and being guided through   towards the pressure zone between at least one cylinder of   printing form (9) and at least one anti-aging cylinder nist (12).   2.- Printer according to claim 1, ca-   characterized in that the central printing cylinder (4) takes the form of a central sheet-guiding printing cylinder (4.1) with at least one system for taking sheets (6).   3 - - Printer according to claim 1, ca-   characterized in that the central printing cylinder   (4) takes the form of a first central cylinder of im. tape guide pressure (4.2).   4.- Printer according to claim 1, ca-   characterized in that at least one impression-shaped cylinder (9) comprising an inking device and   a wetting device (10;! 1) is provided   above the upper strand (13} of the collecting element of printed proofs (7) ..   5.- Printer according to claim 1., Ca-   characterized in that at least one cylinder of 5.dlmpression shape (9} comprising an inking device and   a wetting device (10; 11) is arranged   below the lower strand (14) of the collecting element of printed proofs t (7).   6.- Printer according to claim 1, ca-   characterized in that at least one impression-shaped cylinder (9) comprising an inking device and   a wetting device (10 '; 11) is arranged at   above the upper strand (13) of the collecting element   of printed proofs (7), while at least one- cylin-   dre of printing form (9) comprising an inking device and a wetting device. (10; 11} is arranged below the lower strand (14) of the element   collector of printed proofs (7).   7.- Printer according to claim 2, Ca-   characterized in that at the central impiession cylinder   sheet guide. (4.1 is associated with another.   collector. of printed proofs (7 ') with at   minus one impression form cylinder (9, ') comprising   both an inking device and a   mooring (10 '; 11') and an antagonist cylinder (12 ').   8.- Printer according to claim i, ca-   characterized in that the proofer element   printed (7; 71 ') takes the form of an imprint blanket endless offset pressure (18).   9.- Printer according to claim 1, ca-   characterized in that at least one blanket room   offset printing unit (19) is connected to the col-   printed proof reader (7; 7 ').   10.- Printer according to claim 1, 'aractéerisee in that the proofing element   printed (7; 7'j includes at least one system of pri-   se (20) for an off-print blanket section set (21).