DE20120078U1 - Sheet guiding device in a processing machine - Google Patents

Abstract

A print machine has a paper sheet rotary guide with a detachable drum cap. The cap (7,8) has especially an ink repellent coating (15) of chrome, iron, titanium, nickel, cobalt, tungsten or molybdenum, covered by a an ink-repellent seal. A pneumatically operated paper sheet guide (10) is located in the sheet transfer zone under the cylinder (6).

Description

[Utility model application]

MAN Roland Printing Machines AG Mühlheimer Strasse 341
63075 Offenbach
5

[Title of the invention] Sheet guiding device in a processing machine

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[Description]

The invention relates to a sheet guiding device in a processing machine according to the preambles of claims 1 and 2.
5

[State of the art]

A processing machine of this type is known as a rotary printing machine with sheet guide cylinders from DE-AS 1 254 645 for sheet transport. The sheet guide cylinders are designed as double-sized transfer drums, which consist of a driven base body and each have two symmetrical flats. Segment-like drum section bodies, also called drum caps, are detachably arranged on the flats. These in turn can be made with a covering made of ink-repellent material for certain print jobs. The covering consists of an ink-repellent material and is arranged on the drum caps by means of clamping elements.

EP 0 059 944 A1 discloses a sheet guiding cylinder with a surface on which an ink-repellent textile material is arranged, allowing relative movement. The cylinder surface has a low-friction coating, preferably made of polytetrafluoroethylene. With this design of the sheet guiding cylinder, the sheet is guided with the printed side on the cylinder surface essentially without smearing.

A guide device with a sheet guide cylinder designed with drum caps is also known from DE 195 13 426 Al. In order to remove the air trapped between the sheet and the drum cap surface, the drum caps are designed with holes for removing the air towards the cylinder interior. Furthermore, a

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An air-permeable textile cover is arranged and an air box is arranged below the sheet guide cylinder. The air box consists of an air doctor blade arranged at the beginning and, if required, also of a final blow pipe arranged at the end.

According to DE 201 07 182 Ul, a sheet guiding cylinder with drum caps and a paint/varnish-repellent coating made of chromium, iron, titanium, nickel, cobalt, tungsten or molybdenum is known. In a further development, a sealing layer from the group of polyorganosiloxanes is arranged on the coating.

[Task of the invention]

The invention is based on the object of creating a sheet guiding device of the type mentioned at the beginning, which in particular allows simple, mark-free or smear-free sheet guiding of single- or double-sided printed and/or varnished sheets and has a low manufacturing cost.

The problem is solved by the training features of claims 1 and 2. Further developments arise from the dependent claims.

A first advantage is that at least one drum cap is arranged on a cylinder base body of a sheet-guiding transfer cylinder in a way that it can be quickly removed. This ensures short set-up times and the transfer cylinder can be used more universally.

The transfer cylinder can be operated without a drum cap or drum caps, i.e. only as a cylinder base with sheet holding systems.

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Furthermore, at least one drum cap with a dye/varnish-repellent surface is arranged on the transfer cylinder, in particular when a freshly printed or varnished side of a sheet is guided on the transfer cylinder.

It is also advantageous that the transfer cylinder as a cylinder base body can be designed either with drum caps and a textile fabric arranged on their outer surface or with drum caps and an ink/lacquer-repellent coating arranged thereon, preferably with an ink/lacquer-repellent sealing layer from the group of polyorganosiloxanes. In this case, a sheet guiding device, explained below, is arranged adjacent to each such transfer cylinder at a distance.

A further advantage is that the above-mentioned designs of sheet-guiding transfer cylinders with sheet guiding device can preferably be arranged after a sheet turning device in the rotary printing press formed at least from printing units, alternatively from printing units and coating units. Alternatively, these transfer cylinders with sheet guiding device can be used in a coating machine formed exclusively from coating units in a 5-row design, if required including at least one sheet turning device.

The arrangement of the drum caps, which are detachably fixed to the cylinder base body of the transfer cylinder, is not limited to a single-size sheet-guiding transfer cylinder. For example, a double-size or a triple- or quadruple-size transfer cylinder, based on a single-size

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Plate or forme cylinders can be realized with several circumferential arrangements of drum caps.

Finally, it is advantageous that such a transfer cylinder with sheet guiding device can be used universally in both straight and perfecting printing.

[Examples]

The invention will be explained in more detail using an embodiment example.

Fig. 1 a sheet processing machine with

Bow guiding cylinders in initial training,
15

Fig. 2 shows a second embodiment according to Fig. 1.

A sheet-fed processing machine has at least printing units for multi-colour printing, alternatively also varnishing units, etc.

0 Each printing unit has a printing cylinder 3 as a sheet guide cylinder, with a blanket cylinder 2 being assigned to the printing cylinder 3 and a plate cylinder 1 being assigned to the blanket cylinder 2. Between the printing units, specifically between the sheet-guiding printing cylinders 3, at least one sheet guide cylinder is arranged as a transfer cylinder (cylinder base body 6) for transporting the sheets to the adjacent printing or varnishing unit. In a further development, three transfer cylinders can be arranged between the printing cylinders 3. In a processing machine designed for perfecting, a turning device 4 as a single or multi-drum turning device is arranged between two printing units, alternatively two varnishing units with forme cylinders 2 or their combination instead of the transfer cylinder or the transfer cylinders.

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arranged.

In the present example, the transfer cylinder is designed to be twice as large and has a cylinder base body 6 mounted on the frame side, on which two sheet holding systems are arranged symmetrically (180° offset) on the circumference. The cylinder base body 6 has, for example, two secant-shaped flattened areas, as is known from DE-AS 1 254 645.

Furthermore, in order to form a curved outer surface, a first drum cap 7 and a second drum cap 8 are detachably arranged on the circumference of the flats on the cylinder base body 6.

In a first embodiment, a net-like textile surface structure 9 is arranged on each drum cap 1 ₁ 8, which allows a relative movement on the outer surface of the drum caps 7, 8 and has paint/varnish-repellent properties. Preferably, in addition, a friction-reducing coating, for example a fluoropolymer, can be arranged on the outer surface of the drum caps 7, 8, on which the textile surface structure 9 is arranged.

In a second embodiment, a paint/varnish-repellent coating 15 is arranged on the surface of each drum cap 7, 8, which is arranged firmly on the surface of the drum caps 7, 8. The coating 15 is low-wear and preferably structured. The layer thickness of the coating 15 is preferably between 10 and 120 μιη. The preferred roughness R ₂ is 5 to 60 μιη.

For smear-free sheet transport, the coating 15 is preferably provided with an irregular surface structure with randomly distributed, pointed conical elevations at a

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designed with the smallest possible bearing capacity and profile valleys.

The coating 15 itself consists of metals such as:

- chromium, iron, titanium, nickel, cobalt or tungsten, - their oxides such as: Al ₂ O ₃ , TiO ₂ , Cr ₂ O ₃ , SiO ₂ or ZrO ₂ ,

- their carbides such as: WC or Cr ₃ C ₂ ,

. Suicides of these metals, mixtures or alloys thereof. Alternatively, pure molybdenum or tungsten carbide/cobalt (WC/Co) can be used as a particularly advantageous material as a coating 15.

Preferably, a sealing layer is arranged firmly on the surface profile of the coating 15. The paint/varnish-repellent character of the structured surface of the coating 15 can be improved by this additional sealing layer or by paint/varnish-repellent particles. Fluorinated hydrocarbons such as acrylates, but also fluoropolymers based on PTFE and fluorine-containing copolymers can be used for this purpose. Alternatively, inorganic-organic hybrid polymers can be applied to the surface, which are made up of an organic Si-Si network and an inorganic Si-O network. Functional groups such as alkyls, vinyls or metal oxides can be incorporated into these hybrid polymers.

Alternatively, polyorganosiloxanes, their hydrocarbon radicals, preferably methyl groups but also other alkyls such as phenyl or aryl groups can be used as the sealing layer (of the coating 15). Halogenated groups, in particular F or F compounds, can also be incorporated into these compounds. Preferably, a sealing material (sealing layer) from the group of polyorganosiloxanes is arranged in a firmly adhering manner on a coating 15, which thus faces the printing material.

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The design of a sheet-guiding transfer cylinder (cylinder base body 6) with detachably arranged drum caps I ₁ in the first or second design is not limited to the design of a double-sized transfer cylinder. Rather, single-sized transfer cylinders with a cylinder base body 6 and a drum cap 7 or 8 or three- and four-sized transfer cylinders each with a cylinder base body 6 and three or four drum caps 7,8 arranged symmetrically on the circumference can be implemented.

The first and second designs are not limited to transfer cylinders, but can be used, for example, for sheet-guiding feed drums, transfer drums and take-off drums (delivery drums).

For example, in a boom with rotating gripper systems, the cylinder base body 6 (without sheet holding systems) can be designed as a sprocket shaft so that at least one drum cap 7 or 8 can be detachably arranged thereon. The coatings 15 are in turn firmly adhered to the drum caps ₁₁ 8 and the sealing layer is arranged on the coating 15.

The drum caps 7, 8 arranged on the transfer cylinders (cylinder base body 6) can be designed either with an undercut, i.e. radii R reduced to the cylinder envelope circle, or with radii R equal to the cylinder envelope circle.

A sheet guiding device 10 is arranged adjacent to the transfer cylinders (cylinder base body 6) in the first or second embodiment below the transfer cylinders. When three transfer cylinders are arranged between the printing cylinders 3, a sheet guiding device 10 is arranged below the first and third transfer cylinders in the conveying direction.

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assigned adjacent.

Each sheet guiding device 10 extends over the maximum format width and has at least one flow channel 12 coupled to a pneumatic system 11, which has an otherwise closed guide surface with nozzles in the direction of the sheet conveying plane. The guide surface is adapted to the sheet conveying plane at a distance. Preferably, several such sheet guiding devices 10 are arranged modularly in the conveying direction.

A transfer area of two sheet-guiding cylinders, for example a printing cylinder and a transfer cylinder (cylinder base body 6), is formed by means of two sheet-holding systems. In a sheet outlet of the sheet guiding device 10 following the transfer area in the conveying direction, a first blowing air system 13 coupled to an air source is arranged over the maximum format width, the blowing air flow of which is directed against the sheet guided on the transfer cylinder (cylinder base body 6). Such a blowing air flow is preferably directed in the direction of the cylinder axis of the cylinder base body 6.

In a further development of the blowing air system 13, in addition to this blowing air flow in the direction of the transfer cylinder, a blowing air flow in the direction of the above-mentioned transfer area can be generated.

Preferably, the first blowing air system 13 is arranged in the conveying direction before or at the beginning, for example the front edge, of the sheet guiding device 10. The blowing air flow of the first blowing air system 13 serves to guide the sheets on the drum caps 7, 8 of the transfer cylinder (cylinder base body 6) and serves to push out the sheet loop after the transfer area.

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A second blowing air system 14 coupled to an air source is arranged approximately perpendicular to the cylinder axis and below the transfer cylinder or the cylinder base body 6 over the maximum format width. The second blowing air system 14 is integrated into the plane of the guide surface of the sheet guiding device 10 or can be arranged between two guide surfaces of sheet guiding devices 10. In a further development, the second blowing air system 14 can be arranged below the plane of the guide surface of the sheet guiding device 10.

The blowing air system 14 is always exposed, i.e. it is not covered by the guide surface.

The blowing air flow of the second blowing air system 14 is directed against the sheet guided on the transfer cylinder. In the conveying direction of the sheet material, the second blowing air system 14 is in turn followed by a sheet guide device 10 with a guide surface in the sheet ascent. The sheet ascent is followed in the conveying direction by the transfer area, for example between the transfer cylinder (cylinder base body 6) and the downstream printing cylinder 3. The printing cylinder 3 forms a printing/varnishing zone with a form/blanket cylinder 3, with a printing cylinder blowing device 5 being arranged in front of this printing/varnishing zone to assist with the sheet guidance.

In a preferred embodiment, the blowing air flow of the second blowing air system 14 is directed against the conveying direction of the sheet material at an acute angle, preferably from 20° to 45°, to the horizontal in the direction of the sheet guided on the transfer cylinder. In a further development of the second blowing air system 14, an additional blowing air flow is directed at an approximately right angle vertically in the direction of the cylinder axis of the cylinder base body 6.

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Both blowing air systems 13, 14 can be supplied separately from separate air sources or coupled to one air source. At least one separate air source is thus provided for the blowing air systems 13, 14, which is independent of a pneumatic system 11 of a sheet guiding device.

The pressure for both blowing air systems 13, 14 is preferably separately adjustable and is higher than the pressure of the pneumatically actuated sheet guiding device 10 with pneumatic system

In a further embodiment, the distance between the blowing air systems 13, 14 and the guide surface of the sheet guiding device 10 can be variably adjusted. A change in pressure can also be achieved by changing the distance.

The described designs of the transfer cylinder (cylinder base body 6) with drum caps 7, 8 with a textile fabric 9 or a coating 15 with sealing is not limited to the use of just one design in a processing machine. Rather, a combination of transfer cylinders according to the first and second designs can also be implemented within the coating machine.

For example, a first transfer cylinder (cylinder base body 6 with drum caps 7, 8) with a textile fabric 9 on the drum caps 7, 8 can be arranged between two printing and/or varnishing units. For example, such a transfer cylinder is arranged downstream of the first printing cylinder 3 of a printing/varnishing unit after a turning device 4.

Alternatively, the boom drum (cylinder base body 6 or sprocket shaft with at least one drum cap 7 or 8) is provided with a coating 15 with a sealing layer on the

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Drum cap 7 or 8 arranged downstream of a printing cylinder 3 of a printing/coating unit in the conveying direction

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[List of reference symbols]

1 plate cylinder

2 form/rubber blanket cylinders 3 printing cylinders

4 Turning device

5 Pressure cylinder blowing device

6 Cylinder base body (transfer cylinder)

7 First drum cap 8 Second drum cap

9 Textile fabric

10 Sheet guiding device

11 Pneumatic system

12 Flow channel (with guide surface) 13 First blowing air system

14 Second blowing air system

15 Coating/sealing layer R Radius

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Claims (7)

1. Sheet guiding device in a processing machine with sheet guiding cylinders, wherein at least one sheet guiding cylinder has a cylindrical base body with at least one sheet holding system and at least one drum cap detachably arranged on the base body, characterized in that
that a paint/lacquer-repellent coating ( 15 ) is firmly arranged on the surface of the drum caps ( 7 , 8 ), wherein the coating ( 15 ) is formed by the metals chromium, iron, titanium, nickel, cobalt, tungsten or molybdenum or at least contains portions thereof, and a paint/lacquer-repellent sealing layer is firmly arranged on the coating ( 15 ),
that a pneumatically actuated sheet guiding device ( 10 ) with a guide surface is arranged at a distance from the sheet conveying plane below a transfer area formed by two sheet holding systems of the cylinder base body ( 6 ) and
that a first blowing air system ( 13 ) generating a blowing air flow in the direction of the sheet guided on the cylinder base body ( 6 ) for pressing out the sheet loop is arranged upstream of the sheet guiding device ( 10 ) in the conveying direction and
that a second blowing air system ( 14 ) is arranged approximately perpendicular to the axis below the cylinder base body ( 6 ), generating a blowing air flow against the arc guided on the cylinder base body ( 6 ),
wherein both blowing air systems ( 13 , 14 ) extend over the maximum format width and are connected to at least one separate air source. 2. Sheet guiding device in a processing machine with sheet guiding cylinders, wherein at least one sheet guiding cylinder has a cylindrical base body with at least one sheet holding system and at least one drum cap detachably arranged on the base body, characterized in that
that a textile fabric ( 9 ) allowing a relative movement on the outer surface of the drum caps ( 7 , 8 ) is arranged on the surface of the drum caps ( 7 , 8 ),
that a pneumatically actuated sheet guiding device ( 10 ) with a guide surface is arranged at a distance from the sheet conveying plane below a transfer area formed by two sheet holding systems of the cylinder base body ( 6 ) and
that a first blowing air system ( 13 ) generating a blowing air flow in the direction of the sheet guided on the cylinder base body ( 6 ) for pressing out the sheet loop is arranged upstream of the sheet guiding device ( 10 ) in the conveying direction and
that a second blowing air system ( 14 ) is arranged approximately perpendicular to the axis below the cylinder base body ( 6 ), generating a blowing air flow against the arc guided on the cylinder base body ( 6 ),
wherein both blowing air systems ( 13 , 14 ) extend over the maximum format width and are connected to at least one separate air source. 3. Sheet guiding device according to claim 1 or 2, characterized in that the blowing air flow of the first blowing air system ( 13 ) is directed towards the transfer area of two sheet holding systems. 4. Sheet guiding device according to claim 1 or 2, characterized in that the blowing air flow of the second blowing air system ( 14 ) is inclined against the sheet conveying direction at an acute angle to the horizontal. 5. Sheet guiding device according to at least claim 1 or 2, characterized in that the pressure for both blowing air systems ( 13 , 14 ) is adjustable. 6. Sheet guiding device according to at least claim 1 or 2, characterized in that the second blowing air system ( 14 ) is arranged freely below the guide surface of a sheet guiding device ( 10 ). 7. Sheet guiding device according to at least claim 1 or 2, characterized in that the sheet rests with the printed side on one of the drum caps ( 7 , 8 ) after a turning device ( 4 ) in the conveying direction.