EP0878301A2 - Transport of sheets without offsetting in a rotary printing press - Google Patents

Abstract

The invention relates to a sheet-fed rotary printing press with at least one unit (1, 3), which comprises an impression cylinder (7, 8) and a further cylinder (5, 6) assigned to the impression cylinder (7, 8), with a spacing position between the impression cylinder (7 , 8) and the further cylinder (5, 6) is adjustable. The sheet-fed rotary printing machine is characterized in that a sheet guiding device (10) is formed on the further cylinder (5, 6), which the printing material sheet transported past the additional cylinder (5, 6) by the counter-pressure cylinder (7, 8) from the further cylinder (5, 6) keeps away when the distance between the impression cylinder (7, 8) and the other cylinder (5, 6) is set. <IMAGE>

Description

The invention relates to a sheet-fed rotary printing press with at least one Printing unit and at least one unit which has an impression cylinder and comprises a further cylinder assigned to the impression cylinder, a distance between the impression cylinder and the further cylinder is adjustable according to the preamble of claim 1.

In the case of multi-color sheet-fed printing machines, a coating unit can be arranged after them can, it happens during printing that only in the first printing units transported sheets are printed with color. Subsequent printing units or coating units run empty, with the blanket cylinder or Lacquer blanket cylinders are turned off from the impression cylinder. This creates between both a small gap through which the previously printed sheets are transported will. Due to the high machine speed it happens that the sheets stand out from the respective printing cylinder, so that the fresh applied paint comes into contact with the rubber blanket or lacquer cloth and smeared.

DE 43 18 777 C2 shows a printing unit of a sheet-fed rotary printing press, where facilities for supporting the sheet guidance are provided, to avoid smearing or damaging the fresh print image. The measures provided in the known version are, however not always effective, because when printing on stiff sheet material does it come, e.g. B. in the back of the arches, nevertheless to a contact of the End of sheet with the rubber blanket or lacquer cylinder.

Based on this state of the art, it is the task at hand Invention a lubrication-free sheet run when parked To enable printing, painting or finishing plants.

The task is performed by a sheet-fed rotary printing press with the features of claim 1 solved. The subclaims contain further features.

The sheet-fed rotary printing press with at least one work, which one Impression cylinder and one assigned to the impression cylinder comprises another cylinder, with a spacing position between the Counter pressure cylinder and the further cylinder is adjustable or variable, is characterized in that on the other cylinder Sheet guiding device is formed, which on the from the impression cylinder another cylinder of printing material transported past from the other Keep cylinder away when the distance between the Impression cylinder or the printing material sheet lying thereon and the other cylinder is set.

The sheet guiding device preferably presses the printing material sheet approximately Direction to the impression cylinder.

An embodiment of the invention further developing the Sheet-fed rotary printing machine is characterized in that the further Cylinder can be stopped so that it does not rotate during the Impression cylinder rotates.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the other cylinder via a clutch from one further cylinder driving machine drive can be uncoupled.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the distance between the further cylinder and the impression cylinder is adjustable by a cylinder channel of the shut down further cylinder can be aligned approximately to the impression cylinder is.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the disengaged further cylinder in the aligned Position can be fixed with a notch opposite a machine frame.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the disengaged further cylinder in the aligned Position with a blown air connection opposite a machine frame is fixable.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the trained on the other cylinder Sheet guiding device made of at least one attached to the other cylinder Sheet guiding element exists.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the sheet guide element as at least one guide tongue is trained.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the sheet guiding element as at least one wheel is trained.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the sheet guiding element as at least one blowpipe is trained.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the blow pipe on the cylinder face with a Blown air connection can be coupled.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the sheet guide element in a cylinder channel of the additional cylinder is integrated.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the distance between the impression cylinder and the further cylinder is adjustable by at least one of the two Cylinder is formed on and off the other cylinder.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the distance between the impression cylinder and the further cylinder is adjustable by one on the cylinder circumference located cylinder lift of the other cylinder is removable.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the further cylinder and the impression cylinder between which the distance position is set, rotate together, meanwhile the sheet guiding device acts on the printing material sheet.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the further cylinder on the peripheral surface trained and forming the sheet guide blowing air nozzles.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the further cylinder has a fixed cylinder core a chamber to which blowing air can be applied and one around the stationary one Cylinder core rotatable outer shell with leading to the blowing air nozzles Blown air channels.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that a rotary valve is assigned to the further cylinder, which, when the other cylinder rotates, the rotating blowing air nozzles Blown air is always temporarily applied when the blown air nozzles are approximately are directed towards the impression cylinder.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the work a printing unit and the other cylinder a Printing sheet is printing cylinder.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the plant a painting plant and the other cylinder is the cylinder painting the substrate sheet.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the plant is a finishing plant and the further cylinder a machining cylinder with tools on the circumference Editing the substrate sheet is.

Another embodiment of the sheet-fed rotary printing press is thereby characterized in that the work in at least one printing unit in Seen sheet transport direction is subordinate.

An embodiment of the invention is schematic in the drawings shown.

Fig. 1

eine schematische Seitenansicht von abgestellten Druck- bzw. Lackwerken,

Fig. 2

einen Teilquerschnitt durch einen Zylinderkanal mit Bogenleitelement,

Fig. 3

einen Längsschnitt durch die Leiteinrichtung.

Fig. 4

Zylinderprofil mit integriertem Blasrohr

It shows:

Fig. 1

a schematic side view of parked printing or coating units,

Fig. 2

a partial cross section through a cylinder channel with a sheet guiding element,

Fig. 3

a longitudinal section through the guide device.

Fig. 4

Cylinder profile with integrated blowpipe

The sheet-fed rotary printing press shown in FIG. 1 is thereby characterized in that the rubber blanket 5 / coating cylinder 6 of the Machine drive 17 are separated by a clutch 18 that the Cylinder channels 9 and the respective impression cylinder 7, 8 aligned the blanket 5 / coating cylinder 6 are fixed in this position and that 7 sheet guide elements 10 are provided in the cylinder channels. With this Solution is achieved that in the area of the cylinder channels, the distance to The outer surface of the printing cylinder is enlarged, so that a much larger one Space for transporting the arches is created. By Sheet-guiding elements in the cylinder channels can be transported without greasing the arches can be improved so that the arch ends are not can be smeared. With this solution, the status of the Technology existing distance between the two cylinders by one Magnified several times.

Fig. 1 shows part of a multi-color sheet-fed rotary printing press, at which by the printing units 37 shown in FIG. 8 already have a pressure of Sheets has taken place, which is then a printing unit 1 not involved in printing be fed. From here the printed sheets are printed using Transfer drums 2 by a coating unit 3, which is also not involved in printing transported and then fed to a sheet delivery 4. Here are the Blanket cylinder 5 and the blanket cylinder 6 from the respective impression cylinder 7, 8 turned off. The blanket cylinders 5 and 6 blanket cylinders have Cylinder channels 9 in which cloth tensioning means in a known manner are provided and carry drive wheels on their steering knuckles.

In the cylinder channels 9 of the blanket 5 or coating cylinder 6 are Sheet guide elements 10 are provided, which serve as guide plates or guide tongues 11 can be trained. The guide plates / guide tongues 11 are in the Cylinder channels 9 can be used and can be attached here. This will achieved that z. B. when printing stiff cardboard the rear sheet edge can slide along the guide plates / guide tongues without the imprint is damaged.

An advantageous embodiment of the invention is characterized in that the sheet guide elements 10 are designed as blowpipes 12, which on the Cylinder face can be coupled with blown air connections. The blowguns can thus a vertical air flow on the sheets to be transported release and thereby achieve the highest pressure. The blowing air 13 of the Blowpipes 12 are perpendicular to those of the respective pressure cylinders 7 and 8 transported sheets directed so that the sheets on the respective Printing cylinders 7, 8 are depressed without them with parts of the Contact blanket cylinder 5 or blanket cylinder 6. Already the Use of these blowpipes prevents the greasing or lifting off printed sheets. In addition to the blow air 13 or the blow pipe 12 can the guide tongues 11 can be provided so that even when processing cardboard smearing of the printed image is prevented. Here is the distance between guide tongues 11 and the outer surface of the respective pressure cylinder 7, 8 significantly enlarged, which also the smear-free transport of Arches supported.

The further advantageous embodiment of the invention shown in FIG. 3 is characterized in that the rubber blanket 5 / coating cylinder 6 in their disengaged position over the blown air connections 15 / notches 19 opposite a machine side frame 16 can be fixed. By inserting the Blown air connections can be fixed in place by means of a seal will. Regardless of this, notches can also be used that are in the Lock the stationary cylinder and ensure that it is fixed.

Fig. 3 shows a longitudinal section in which a printed sheet 14 on the Lateral surface of a pressure cylinder 7, 8 is transported and by blowing air 13, which emerges from the blowpipe 12 is held down. The blowpipe 12 is in the blanket cylinder 5 or blanket cylinder 6 is mounted and is on the Cylinder face can be coupled with a blown air connection 15. By pushing in of the blown air connection 15 is the blanket cylinder 5 or Paint cylinder 6 in its disengaged position opposite one Machine side frame 16 can be fixed. Alternatively, you can choose between the Blanket cylinder 5 or blanket cylinder 6 and the Machine side frame 16 a notch 19 may be provided for fixing. (Fig. 4) The blown air connection 15 can also be provided in a journal 20 be so that the blowing air within the cylinder can be fed to the blowpipe.

Both the blanket cylinder 5 and the blanket cylinder 6 can be separate from the machine drive 17 via a coupling 18 so that the Cylinder channels 9 aligned with the respective pressure cylinder 7, 8 are how this z. B. is shown in Fig. 1 and Fig. 2. Be in this position the blanket cylinder 5 or blanket cylinder 6 fixed so that the Printing machine with its previous printing units unhindered can produce.

5 is a modification of the embodiment shown in FIG Invention shown. In addition or in combination with those shown in FIG. 2 Sheet guiding elements are rotatably attached to the cylinders 5, 6, which are designed as spur cogs. The wheels 34 can be axial Direction of the cylinder 5, 6 adjustable and preferably to print-free Longitudinal corridors of the printing material sheet 14 can be set. The cogs 34 can also roll in the area of the printed image, with smearing of the fresh ink is practically excluded. For one, they are The wheel 34 can be rotated by the printing sheet 14 touching it, so that no relative movement leading to smearing between the Sheet 14 and the wheel 34 can take effect. On the other hand the wheels 34 with their needle-like tips have only a minimal one Point contact to the printed sheet 14.

6 shows a further embodiment of the invention, which different from those described in the previous figures Embodiments differs in that the other cylinder 5, 6 is not is stopped but also rotates while the printing material sheet 14 is conveyed past the other cylinders 5, 6 by the impression cylinder 7, 8. This has the advantage of causing lubrication Relative movement between the peripheral surface of the further cylinder 5, 6 and the printing material sheet 14 is avoided. This is for example in the Case important if the effect of the printing material sheet 14 from further Cylinder 5, 6 blowing air nozzles 35 not yet activated or the Blow air pressure is set too low. The further cylinder 5, 6 is in the Fig. 6 illustrated example exactly as in those described above Figures designed as a lacquer or rubber blanket cylinder. The distance between the peripheral surfaces of the other cylinders 5, 6 and Back pressure cylinder 7, 8 or the one resting on the latter Printing material sheet 14 can by further shifting Cylinder 5, 6 can be adjusted away from the impression cylinder 7, 8. Of the Distance can also be set by one on the other Cylinder 5, 6 for its active use z. B. for printing or painting, required cylinder lift 36, z. B. a rubber blanket from the cylinder 5, 6 is removed, whereby the blown air openings 35 are also exposed. The blowing air opening 35 can in the circumferential direction and in the axial direction the entire lateral surface of the cylinder 5, 6 evenly distributed and in rows be arranged. The further cylinder 5, 6 is constructed in several parts, the Cylinder core 21 has a chamber 28 which is open on the outside to envelope 22, which with the central channel 29 and one or more radial channels 30 with Compressed air can be supplied from the blown air source 24. The chamber 28 can be a be axially parallel channel extending over the entire cylinder length. The hollow cylindrical shell 22 rotates around the cylinder core 21, whereby the in the blowing air ducts 23 opening on the inside temporarily with the Chamber 28 overlap so that the blown air from chamber 28 into the blown air channels 23 and from the respective on the chamber 28 Blowing air nozzles 35 can flow out. The cylinder core 21 can be adjustable in the circumferential direction, the position of the chamber 28 being variable is. For example, the chamber 28 can be exactly on the center of the Back pressure cylinder 7, 8 or something in the direction of the inlet gap of the Substrate sheet 14 between the cylinders 5, 6; 7, 8 aligned be adjustable. The printing material sheet 14 mechanically from further Cylinder 5, 6 at a distance sheet guide elements, for. B. in the guide tongues 11 or cogs 34 shown above, are particularly suitable for heavy rigid cardboard. Pneumatically acting Sheet guiding devices, such as the blowpipe 12 and those in the Figures 6 and 7 blowing air nozzles 35 are particularly for light papers suitable.

The further embodiment of the invention shown in FIG. 7 is one Modification of the embodiment shown in FIG. 6. The further cylinder 5, 6 is formed in one piece and points in the direction parallel to the axis extending longitudinal channels 31, of which in the blowing air nozzles 35th branch off radial channels 30. The longitudinal channels 31 open at the Cylinder face. When the further cylinder 5, 6 rotates, the Longitudinal channel openings 31 temporarily with a valve opening 33 one external to the cylinder, e.g. B. arranged on the machine side frame rotary valve 32nd in coverage. The facing the openings 31 on the other cylinder 5, 6 Valve opening 33 is part of one of the blown air source 24 with blown air acted chamber of the valve 32. The blown air enters from the opening 33 in the opening 31 over as long as the openings 31, 33 are in register. The openings 31 formed on the cylinder and the openings arranged outside the cylinder Opening 33 are placed so that substantially in the area of the Cylinders 5, 6; 7, 8 formed gap passing blow air nozzles 35 with Blown air is applied, as is already the case in connection with FIG. 6 is described. In this way, the impression cylinder 7, 8 conveyed printing material sheet 14 to the further cylinder 5, 6 at a distance held.

In Fig. 8 is the printing machine already partially shown in Fig. 1 again shown, the in the sheet transport direction in front of the printing unit 1 and Coating unit 3 arranged printing units 37 are also shown. Instead of or in addition to the coating unit 3, a finishing unit can be provided, which also has an impression cylinder 7, 8, but which is not with a coating cylinder 5, 6 as in the printing or coating units 1, 3 but cooperates with a processing cylinder. The example used in place of the blanket or blanket cylinder 5, 6 Machining cylinder is filled with tools. For example, on the Machining cylinder a plate with punching tools can be clamped. Furthermore, the processing cylinder can be embossed, creased, or Perforating tools to be equipped so that the pressure with the Printing units 37 subsequent finishing of the printed product is possible.

REFERENCE SIGN LIST

1

Printing unit

2nd

Transfer drum

3rd

Coating unit

4th

Sheet delivery

5

Blanket cylinder

6

Paint cylinder

7

Impression cylinder

8th

Impression cylinder

9

Cylinder channel

10th

Sheet guiding elements

11

Guide tongues

12th

Blowpipe

13

Blowing air

14

bow

15

Blown air connection

16

Machine side frame

17th

Machine drive

18th

clutch

19th

Rested

20th

Axle journal

21

Cylinder core

22

Cylinder sleeve

23

Blow air duct

24th

Blown air source

25th

26

Gripper

27

Cylinder channel

28

chamber

29

Central channel

30th

Radial channel

31

Longitudinal channel opening

32

Rotary valve

33

Valve opening

34

Cog

35

Blow air nozzle

36

Cylinder lift

37

Printing unit

Claims (22)

Sheet-fed rotary printing press (1, 3, 37) with at least one work (1, 3) which comprises an impression cylinder (7, 8) and a further cylinder (5, 6) associated with the impression cylinder (7, 8), a spacing position between the Impression cylinder (7, 8) and the further cylinder (5, 6) is adjustable,
characterized,
that on the further cylinder (5, 6) a sheet guiding device (10, 35) is formed which keeps the printing material sheet (14) transported past the impression cylinder (7, 8) past the further cylinder (5, 6) away from the further cylinder (5, 6) when the distance between the impression cylinder (7, 8) and the other cylinder (5, 6) is set. Sheet-fed rotary printing machine according to claim 1,
characterized,
that the further cylinder (5, 6) can be stopped, so that it does not rotate, while the impression cylinder (7, 8) rotates. Sheet-fed rotary printing machine according to claim 2,
characterized,
that the further cylinder (5, 6) can be uncoupled via a clutch (18) from a machine drive (17) driving the further cylinder (5, 6). Sheet-fed rotary printing machine according to one of claims 1 to 3
characterized,
that the spacing position between the further cylinder (5, 6) and the impression cylinder (7, 8) can be adjusted by aligning a cylinder channel (9) of the shut down further cylinder (5, 6) approximately to the impression cylinder (7, 8). Sheet-fed rotary printing machine according to claim 4,
characterized,
that the disengaged further cylinder (5, 6) can be fixed in the aligned position with a catch (19) relative to a machine frame (16). Sheet-fed rotary printing machine according to claim 4,
characterized,
that the disengaged further cylinder (5, 6) can be fixed in the aligned position with a blown air connection (15) relative to a machine frame (16). Sheet-fed rotary printing machine according to one of Claims 1 to 6,
characterized,
that the sheet guiding device formed on the further cylinder (5, 6) consists of at least one sheet guiding element (10 to 12, 34) attached to the further cylinder (5, 6). Sheet-fed rotary printing machine according to claim 7
characterized,
that the sheet guide element (10) is designed as at least one guide tongue (11). Sheet-fed rotary printing machine according to claim 7,
characterized,
that the sheet guiding element (10) is designed as at least one wheel (34). Sheet-fed rotary printing machine according to claim 7,
characterized,
that the sheet guiding element (10) is designed as at least one blow pipe (12). Sheet-fed rotary printing machine according to claim 10,
characterized,
that the blow pipe (12) can be coupled to a blow air connection (15) on the cylinder face. Sheet-fed rotary printing machine according to one of claims 7 to 11,
characterized,
that the sheet guide element (10, 11, 12, 34) is inserted in a cylinder channel (9) of the further cylinder (5, 6). Sheet-fed rotary printing machine according to one of Claims 7 to 12,
characterized,
that the distance position between the impression cylinder (7, 8) and the further cylinder (5, 6) can be adjusted by at least one of the cylinders (5, 6; 7, 8) on the other cylinder (5, 6; 7, 8 ) is formed on and off. Sheet-fed rotary printing machine according to one of Claims 1 to 13,
characterized,
that the distance position between the impression cylinder (7, 8) and the further cylinder (5, 6) can be adjusted by removing a cylinder lift (36) of the further cylinder (5, 6). Sheet-fed rotary printing machine according to one of Claims 1 to 14,
characterized,
that the further cylinder (5, 6) and the impression cylinder (7, 8) between which the spacing position is set rotate together, during which the sheet guiding device (10, 34) acts on the printing material sheet (14). Sheet-fed rotary printing machine according to claim 15
characterized,
that the further cylinder (5, 6) has blown air nozzles (35) arranged on the peripheral surface and forming the sheet guiding device. Sheet-fed rotary printing machine according to claim 16
characterized,
that the further cylinder (5, 6) has a fixed cylinder core (21) with a chamber (28) which can be blown with blown air and an outer shell (22) which can be rotated about the fixed cylinder core (21) and has blown air ducts (23) leading to the blown air nozzles (35) ) having. Sheet-fed rotary printing machine according to claim 16
characterized,
that the further cylinder (5, 6) is assigned a rotary valve (32) which, when the further cylinder (5, 6) rotates, always applies blown air to the rotating blown air nozzles (35) when the blown air nozzles (35) are approximately at Impression cylinders are directed. Sheet-fed rotary printing machine according to one of claims 1 to 18
characterized,
that the work (1, 3) is a printing unit (1) and the further cylinder is a cylinder (5) printing on the printing material sheet (14). Sheet-fed rotary printing machine according to one of claims 1 to 19
characterized,
that the work (1, 3) is a coating unit (3) and the further cylinder (5, 6) is a cylinder (6) that paints the printing material sheet (14). Sheet-fed rotary printing machine according to one of claims 1 to 20
characterized,
that the work (5, 6) is a finishing plant and the further cylinder (5, 6) is a processing cylinder on the circumferential side with tools for processing the printing material sheet (14). Sheet-fed rotary printing machine according to one of claims 1 to 21
characterized,
that the work (1, 3) of at least one printing unit (37) of the sheet-fed rotary printing machine is arranged downstream, as seen in the sheet transport direction.

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