FR2626815A1 - PRINTING MACHINE FOR PRINTING ON THE RECTO OR FOR RECTO AND BACK 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 supply and comprises at least one system of cylinders 27 arranged at the bottom. following the central printing cylinder 4 and in front of the evacuation of the printing paper, this cylinder system forming part of a printing device on the reverse side 28 and containing at least one printing cylinder on the reverse side 29.

Description

"Printing machine for printing on the front or for impres-

front and back. "

  The invention relates to a printer for printing on the back or for printing on the front and back, especially for polychrome printing. A sheet printing machine (DE 32 03 948) is known in which the rubber cylinders of the different printing units, touching each other for ink transfer, are arranged in a row, while a cylinder which at the same time, the entrance drum and the

  return of the transfer chain circuit, is likely to

  tible to be applied against the rubber cylinder.

  Chouc. The disadvantage in this -as, is that for the

  transfer of printed proofs of many

  Inking continuity is required, which causes dot magnification, smearing, and thus loss of quality. In these machines, moreover, because of the greater than average number of continuity solutions, a regulation of the thickness of the ink layer corresponding to the path of length different from the ink to the

  transmission of this ink on the printing paper

  sion, is problematic. This machine design, because of the aforementioned defects, is not applicable for modern machines with a large number of printing units, for example for a machine

ten colors.

  Another disadvantage is that with this

  machine, printing on the front and on the ver-

so is not possible.

  The object of the invention is to increase the quality of the printing, to simplify the transport of the sheets and thus to obtain an increase in the printing capacity and an extension of the implementation of a printer. according to the principle of

transport of proofs.

  The problem posed to the invention is to create,

  according to the principle of proof transport, a printer

  which has a reduced number of inking continuity solutions, which can be equipped with a

  large number of printing groups, and thanks to the-

  it is possible to print on the front or back

to and on the back.

  This problem is solved, in accordance with the

  in the case of a printing machine for front and back printing, with a printing paper supply, a printing paper

  printing paper, with at least one roll of

  printing machine with inking device and

  anchorage and with at least one tran-

  a printed proof sport in contact with the printing paper transport system and the printing forme cylinder, in that the printing paper transport system takes the form

  a central printing cylinder cooperating with the

  printing paper and comprises at least one cylinder system arranged at the end of the

  central printing cylinder and in front of "vacua-

  printing paper, this system s cylinders forming part of a printing device on the back

  and containing at least one printing cylinder

  so, an opposing cylinder being associated with each impression form cylinder and the printed matter transfer element being constructed in the form of

  of a collector of proofs printed under

  -me endless band being in contact with the

  central printing cylinder and passing through the -

  zone between at least one impression-form cylinder and at least one counter-roll.

  shape of a central cylinder. printing and tran-

  sheet sport, with at least one gripping system

  or it is shaped like a central cylinder of

  tape transport pressure. The cylinder system consists of a printing cylinder on the back and

  conveyor belt, - or at least one cylinder

  dre printing leaves on verso with at least:

  a catch system, or it is constituted by a

  cylinder for printing sheets on the back with at least one gripping system and a transfer cylinder, with at least one gripping system, or it consists of two transfer cylinders optionally having the shape of cylinders of inversion of: sheets or transport cylinders, or it consists of four transfer cylinders with a coating of

  the shape of cylinders of the inversion of tape or cy-

30. Transport lndres .:

  The printing device on the back is

  in the form of a printing device cons-

  staggered by a cylinder of impresion form with dis-

  positive inking and wetting device 'and by a

  offset cylinder in contact with the oylin-

  4. dre of print form and cylinder system, or this printing device on the back covers the

  another form of proofreader

  come into contact with the cylinder system.

  with at least one impression-form cylinder, with inking device and wetting device,

  and at least one counter cylinder.

  In this case, at least one printing-form cylinder with an inking device and a wetting device is disposed above the upper run of the printed proof-collecting element, or at least one The print is arranged below the lower end of the printed proof collector. or at least one cylinder of

  form of printing with an inking device and

  the wetting device is placed above the upper strand

  of the printed proof collecting element, while at least one printing forme cylinder with an inking device and a wetting device is arranged below the lower part of the element.

printed proof collector.

  The proof-proofing element takes the form of an offset printing blanket without

  end, or at least one coin blanket of impres-

  offset is integral with the collector element of

  printed evidence, or the collector

  printed evidence shall include at least one system of

  for an offset printing blanket piece.

  The invention will be described in more detail

  hereinafter with reference to an exemplary embodiment.

  In the attached drawings: - Figure 1 shows a sheet printer allowing the choice of printing on the back and front (printing device), - Figure 2 shows a printer from

  sheets allowing choice 1 'printing on the front and-

  on the back (printed proof collector element); FIG. 3 shows a sheet printer allowing the choice of printing on the front and the back (printing device and transfer cylinder); FIG. -a sheet printer allowing choice of printing on the front and back (Flaneta sheet transfer system)> - Figure 5 shows a sheet printer allowing the choice of printing on the front and back (transfer system). Miller leaves)

  - Figure 6 shows a printer 'rou'-

  for front and back printing.

  The printer according to the invention in the form of a sheet printer, consists of a sheet transport system and

  an uncritical proof transport system.

  The sheet transport system consists of (Figure 1) - a paper feed

  with a feeder 1, a feed table

  2 and a transfer of sheets 3, for example a

  pre-setting device, by a tran-

  printing papeter sport revegetating the shape of a central cylinder for printing and transporting sheets 4.1, arranged - following the transfer of sheets, and by an evacuation of printing paper

  in the form of a sheet transfer 5.

  Between the central cylinder for printing and transporting sheets 4.1 and the transfer of sheets, is inserted a system of cylinders 27. This system

  of cylinders 27 is part of a device for "impres-

  The roll system 27 comprises a paper-printing cylinder on the backside 29.1 (FIG. 1) or a sheet-printing cylinder.

  the verso 29.1 and a transfer cylinder 30 (

  gures 2 and 3), or two cylinders that can optionally be used as reversing cylinders

  sheets or as transport cylinders (sys-.

  Planeta according to DD 54 703, figure 4), or four cylinders that can be used as desired

  as reversing cylinders or as cy-

  transport lances (Miller system according to DE i 107

245, FIG. 5).

  In the case of front and back printing according to the Planeta system, the first sheet reversing cylinder functions as a cylinder

  reversal of sheets 31 and the second cylinder of

  leaf version works as a cylinder of im-

  leaf pressure on reverse 29.1. The inversion of

  leaves are then made in the known manner, either

  be the central cylinder for printing and transporting sheets 4.1 and the first cylinder for inverting

  leaves 31, - or between the first cylinder of

  leaf version 31 and the print cylinder of

leaves on verso 29.1.

  In the case of printing on the front, there is no reversal of sheets and the cylinder system

  27 consists solely of

sport 32.

  The two rolls of inversion of sheets

  29.1; 31 are likely, after changing the syttè-

  me,. to be used in a known way, such as

transport goods 32.

  In the case of printing on the front and on the

  according to the Miller system, the first, second and third sheets reversing cylinder 31; 33;

  34 function as rollover rolls

  the, while the fourth leaf reversing cylinder functions as the printing cylinder of

  leaves on verso 29.1. The inversion of the leaves is

  between the second and the third rolls of sheet inversion. In the case of printing on the front, there is no inversion of sheets and the cylinder system 27 is only constituted by

transport cylinders 32.

  The four rolls of inversion-sheets are, after system change, likely to be

  used as transport cylinders 32.

  The central cylinder for printing and

  4.1, the sheet-roll printing cylinder 29, the transfer cylinder 30, the sheet-reversing rolls 31; 33; 34 and the transport cylinder 32 comprise two gripping systems, the number of these gripping systems can be

increased or decreased.

  The printer conforms to the invention in its production under the form of a printing machine.

  rolls or tape printing machine, is

  killed by a tape transport system and a system

  me of transport of printed proofs.

  The tape transport system (Figure 6)

  consists of a paper supply of impres-

  with an unwinder 22 and a web guiding roll 23, with a central printing and

  4.2 and with an evacuation of:

  printing pier made in the form of a -enroll-

  24 with web guide rollers 25. Following the central printing and web transporting cylinder 4.2, a printing cylinder is arranged at

  back and tape transport 29.2. - -

  The printed proof transport system consists on the one hand of a collecting element

  printed proof 7 which is in the form of a

  endless band guided through two routs

  8, and who is in contact with the cy-

  central printing unit 4. On the other hand, the system

  The printed proof transport me is constituted by at least one printing device. This printing device consists of an impression cylinder 9 with inking device 10 and wetting device 11, as well as an opposing cylinder

  12. The upper strand 13 of the collector element

  printed evidence 7 crosses the contact zone between

  the shape cylinder 9 and the counter cylinder 12.

(Figures 1; 4; 5).

  FIG. 2 shows an embodiment in which a first quantity of

  printing units is in contact with the upper strand

  13 of the printed proof collector

  7, while a second amount of printing groups

  sion is in contact with the lower strand 14 of the

  printed proof collector 7.

  FIG. 3 shows a form of embodiment in which the printing devices constituted by a printing-forme cylinder 9 with an inking device and a wetting device (10; 11) and by an opposing cylinder 12, in

  contact with the lower strand 14 of the collector element

printed proof 7.

  In Figure 6 is shown a form of

  realization in which a collector element of

  printed evidence 7 is associated with the Central Printing and Tape Transport Cylinder 4.2

  On the central printing cylinder 4 (

  2) acts at least one drying device 15, and on the printed proof collecting element 7, acts at least one washing device 16 and a sensor of

bubbles 17.

  The printed-proof collecting member 7 is made in the form of an endless offset printing blanket 18 (Fig. 1), or at least one offset printing blanket part 19 is connected to the element printed proof collector 7 ,, in which case, when several pieces of blanket printing

  offset are connected with the element: test collector

  it is planned to have an intermediary space

  for the gripping system 6 (Figure 2).

  The proof-proofing member 70 may also consist of at least one offset printing-blanket coin-19 transported on a front-edge or front-edge gripping system.

  rear edge, and / or lateral edges (Figure 3) .-

  The printing cylinder on the back 29 is associated with a printing device on the back 28. This printing device on the back 28 is constituted by a printing device 28.1 or by another

  collection element of printed proofs 28.2.

  The printing device 28.1 is

  killed by an offset clinker 25 and a cylinder of printing form 9, with a device for

wetting device 10; 11.

  The other element of print proofing

  28.2 is constituted in a manner similar to that

  of the hard copy collector 7.

  The mode of operation will be described below.

  of the printed paper according to the invention.

  tion. The sheet taken by the feeder 1 is brought

  30. to the central printing cylinder 4.1. through

  of the feed table 2 and the transfer of sheets 3 .. After the printing, the applied ink -u

  the sheet is dried by means of the dryer 15.

  The collector's element of printed proofs 7

  -traverse the area between the impression cylinder

  sion 9.et. the counter cylinder 12 of the first printing unit and supports the printed proof

with the first color.

  Correspondingly to the number of groups

  The other colors are applied in the same way. The test comprising all the colors is transferred onto the sheet by passing through the zone between the central pressure cylinder 4 and

  the collector of hard copies 7.

  After the transfer of the leaf on the

  On the back side 29.1, the back of the sheet is printed with a printing device on the backside 28 as a known printing device 28.1 or another collector printed proofs 28.2. Then, the '

  sheet is brought to the sheet transfer 5. The

  The pressure of a band is similar.

  The advantages of this system lie in the

  simplification of the transport of leaves in the

  front and back pressure and in printing without smudging problem with a reduced number of solutions

continuity of inking.

e0: l

Claims (16)

REVENDCATIONS,   1.-Printer for printing on the front and   for printing on front and back, with a power supply   printing paper, a printing paper transport system and a papiet evacuation   of printing, with at least one cylinder of im-   pressure (9) with an inking device (10) and   anchoring device (11) and with at least one. printed matter transfer member in contact with the printing paper transport system and the printing form cylinder, characterized in that the printing paper transport system takes the form of a central cylinder   printing (4) cooperating with. feeding in   printing cylinder and comprises at least one cylinder system (27) arranged after the central printing cylinder (4) and in front of the levac-uation of the printing paper, this cylinder system being part of   of a printing device on the back (28) and containing   at least one impression cylinder on the back (29), an opposing cylinder (12) being associated with each printing forme cylinder (9) and the printed proof transfer element being in the form of a printed-matter collecting member (7) 2r5 in the form of an endless belt being in contact with the central printing cylinder (4) and passing through the area between a print-form cylinder (9) and at least one 4ntagonist cylinder (12)   2.- Printer Belon the claim 1l ca-   characterized in that the central printing cylinder (4) is coated. the shape of a central impression and sheet transport cylinder (4.1) with at least one gripping system (6).   3. Printer according to claim 1, ca.   characterized in that the central printing cylinder (4) is in the form of a central printing and web transport cylinder (4.2).   4. The printer according to claim 1,   characterized in that the cylinder system (25) is constituted by an impression cylinder on the back and tape transport (29.2).   5. Printer according to claim 1,   characterized in that the cylinder system (27) is constituted by at least one impression cylinder of the sheets on the back (29.1) with at least one socket (6).   6. The printer according to claim 1,   characterized in that the cylinder system (27) is comprised of a backside printing cylinder (29.1) with at least one gripping system (6) and a transfer cylinder (30) with at least one gripping system (6).   7. The printer according to claim 1,   characterized in that the cylinder system (27) is constituted by two transfer rollers which, as desired, are in the form of rolls of sheet inversion   (29.1; 31) or transport rolls (32).   8.-8, printer according to claim 1,   characterized in that the cylinder system (27) is constituted by four transfer cylinders which optionally cover the form of leaf reversing cylinders (29.1; 31; 33; 34) or transport cylinders (32).   9. The printer according to claim 1,   characterized in that the back printing device (28) is in the form of a printing device (28, 1) consisting of a shaped cylinder   printing device (9) with an inking device and   anchor (10; 11) and a cylinderoffset   (26) being in print contact with the   printing form lindre and the -cylndre system (27). 10.Printer according to. the claim 1, characterized in that the device -printing   reverse side (28) takes the form of another   of printed proofs (28.2} found in:   printing pressure with the cylinder system (27>, with at least one printing forme cylinder (9) with inking device and wetting device   (10; 11) and an opposing cylinder (12).   11. The printer according to claim 1.   characterized in that at least one shaped cylinder   printing device (9) with an inking device and   anchor (10; 11) is arranged above the   upper strand (13) of the tpreuvs collector element. printed (7).   12. The printer as claimed in claim 1, characterized in that at least one printing-forme cylinder (9) with inking device and wetting device (10; 11) is arranged below the lower strand. (14) Proof Collector printed (7).   13. The printer according to claim 2, characterized in that at least one cylinder of form   printing device (9) with an inking device and   The wetting device (J0; 11) is disposed above the upper run (13) of the printed preventer collecting element (7) and at least one shaped cylinder   printing device (9) with an inking device and   anchor (10; 11) is disposed below the lower strand (14) of the proof collector printed (7).   14. The printer according to claim 1,   characterized in that the proofing element -   printed matter (7,? ') takes the form of a blanket of endless offset pressure (18).   15.- printer according to claim 1, characterized in that at least one offset printing blanket part (19) is integral with the element   printed proof collector (7, 7 ').   16. The printer according to claim 1, characterized in that the proofing element   printed matter (7, 7 ') comprises at least one system of   se (20) for an offset printing blanket part (19).