EP1319505B1 - Processing machine with device for guiding sheets - 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

The invention relates to a processing machine according to claim 1.

[State of the art]

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

Out EP 0 059 944 A1 a sheet guiding cylinder with a lateral surface is known, on which a relative movement gestattendes, color-repellent textile material is arranged. The cylinder surface has a low-friction coating, preferably made of polytetrafluoroethylene, on. In this embodiment of the sheet guiding cylinder, the sheet is guided with the printed side on the cylinder jacket surface substantially free from smearing.

A guide with a trained with drum caps sheet guiding cylinder is still off DE 195 13 426 A1 known. In order to eliminate the jammed air between the sheet and the drum cap surfaces, the drum caps are provided with holes for removing the air in the direction of the cylinder interior. Furthermore, on the drum caps a arranged air-permeable textile elevator and below the sheet guiding cylinder, an air box is arranged. Among other things, the air box consists of an air knife at the beginning and, if required, also a final blower tube arranged at the end.

According to DE 201 07 182 U1 is a sheet guiding cylinder with drum caps and formed by chromium, iron, titanium, nickel, cobalt, tungsten or molybdenum color / paint-repellent coating known. In a development, a sealing layer from the group of polyorganosiloxanes is arranged on the coating.

OBJECT OF THE INVENTION

The invention has for its object to provide a processing machine that allows in particular a simple, mark-free or smear-free sheet management of one or both sides printed and / or painted sheet and has a low production cost, the arc leading sheet guiding cylinder is universally applicable.

The object is solved by the training features of claim 1. Further developments emerge from the dependent claims.

A first advantage is due to the fact that at least one drum cap is arranged on a cylinder main body of a sheet-guiding transfer cylinder quickly detachable. This ensures short set-up times and the transfer cylinder is universally applicable.

Thus, the transfer cylinder without drum cap or drum caps, ie only as a cylinder base body with sheet holding systems operable.

Furthermore, at least one Trömmelkappe with a color / paint-repellent mantle surface is arranged on the transfer cylinder, especially when a freshly printed or painted side of a sheet is guided on the transfer cylinder.

It is likewise advantageous that the transfer cylinder can be embodied as a cylinder main body optionally with drum caps and a textile fabric arranged on its lateral surface or can be executed with drum caps and a color / paint-repellent coating arranged thereon, preferably with a color / paint-repellent sealing layer from the group of polyorganosiloxanes ,
In this case, each such transfer cylinder, a sheet guiding device explained below is arranged adjacent to the distance.

Another advantage is that the o.g. Formations of sheet-guiding transfer cylinders with sheet guiding device preferably after a sheet turning device in the at least from printing units, alternatively formed from printing units and coating units rotary printing machine can be arranged. Alternatively, these transfer cylinders with sheet guiding device can be used in a coating machine formed exclusively from coating units in a series construction, if necessary including at least one sheet turning device.

The arrangement of the drum caps which are detachably fixed to the cylinder main body of the transfer cylinder is not limited to a single-sized sheet-guiding transfer cylinder. For example, a double-sized or a three- or four-fold transfer cylinder, based on a single-sized Plate or form cylinder, with several peripheral arrangements of drum caps feasible.

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

[Examples]

Fig. 1

eine Bogenverarbeitungsmaschine mit Bogenführungszylindern in erster Ausbildung,

Fig. 2

eine zweite Ausbildung gemäß Fig. 1.

The invention will be explained in more detail using an exemplary embodiment. Showing:

Fig. 1

a sheet processing machine with Bogenführungszylindern in the first training,

Fig. 2

a second training according to Fig. 1 ,

A sheet processing machine has at least printing units for multi-color printing, alternatively also coating units, etc., on. Each printing unit has a printing cylinder 3 as a sheet guiding cylinder, wherein the printing cylinder 3, a blanket cylinder 2 and the blanket cylinder 2, a plate cylinder 1 is assigned. Between the printing units, especially between the sheet-guiding printing cylinders 3, at least one sheet guiding cylinder is arranged as a transfer cylinder (cylinder base 6) for the sheet transport to the adjacent printing or coating unit. In a further development, three transfer cylinders between the printing cylinders 3 can be arranged. In a designed for perfecting processing machine is between two printing units, alternatively two coating units with cylinders 2 and their combination instead of the transfer cylinder or transfer cylinder, a turning device 4 as a single or multi-drum application arranged.

The transfer cylinder is double-sized in the present example and has a base frame 6 mounted on the frame side, on which two sheet-holding systems are arranged circumferentially symmetrically (offset by 180 °). The cylinder main body 6 has, for example, two secant-shaped flattenings, as is apparent DE-AS 1 254 645 is known.

Furthermore, a first drum cap 7 and a second drum cap 8 are circumferentially detachably arranged to form a curved lateral surface on the flats on the cylinder body 6.

In a first embodiment, a net-like, textile surface image is arranged on each drum cap 7, 8, which allows a relative movement on the lateral surface of the drum caps 7, 8 and has color / paint-repellent properties. In addition, a friction-reducing coating, for example a fluoropolymer, on which the textile fabric is arranged, can preferably be arranged on the jacket surface of the drum caps 7, 8.

In a second embodiment, on the mantle surface of each drum cap 7, 8 a color / paint-repellent coating 15 is arranged, which is adhered to the mantle surface of the drum caps 7, 8. The coating 15 is wear-resistant and preferably structured. The layer thickness of the coating 15 is preferably between 10 and 120 microns. The preferred roughness R _z is 5 to 60 μm.

For the smear-free sheet transport, the coating 15 is preferably with an irregular surface structure with randomly distributed, pointed cone-shaped elevations in one Trained as low as possible support share and profile valleys.

• Chrom, Eisen, Titan, Nickel, Kobalt oder Wolfram,
• deren Oxide wie: Al₂O₃, TiO₂, Cr₂O₃, SiO₂ oder ZrO₂,
• deren Karbide wie: WC oder Cr₃C₂,
• Silizide dieser Metalle, Mischungen oder Legierungen davon. Alternativ ist als besonders vorteilhafter Werkstoff reines Molybdän oder Wolframcarbid/Kobalt (WC/Co) als Beschichtung 15 einsetzbar.

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

Preferably, a sealing layer is adhesively bonded to the surface profile of the coating 15. The color / paint-repellent character of the structured surface of the coating 15 can be improved by this additional sealing layer or by color / paint-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 composed 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, as a sealing layer (the coating 15) polyorganosiloxanes, their hydrocarbon radicals, preferably methyl groups but also other alkyls, such as phenyl or aryl groups used. Halogenated groups, in particular F or F compounds, can furthermore be incorporated into these compounds. Preferably, a sealant (sealing layer) from the group of polyorganosiloxanes is adhesively bonded to a coating 15, which thus faces the printing material.

The formation of a sheet-guiding transfer cylinder (cylinder body 6) with detachably arranged drum caps 7, 8 in the first or second embodiment is not limited to the formation of a double-size transfer cylinder. Rather, simply large transfer cylinder with a cylinder base 6 and a drum cap 7 or 8 or three and four-size transfer cylinder, each with a cylinder base 6 and three or four symmetrically arranged on the circumference drum caps 7,8 executable.

The first and second training is still not limited to transfer cylinders, but can be used, for example, in sheet-guiding installation drums, transfer drums and take-off drums (jib drums).
For example, in a boom with rotating gripper systems, the cylinder main body 6 (without sheet holding systems) can be executed 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 adhesively bonded to the drum caps 7, 8 and the sealing layer is arranged on the coating 15.

The drum caps 7, 8 arranged on the transfer cylinders (cylinder main body 6) are either with an undercut, i. to the cylindrical envelope reduced radii R or with the cylinder envelope same radii R executable.

The transfer cylinders (cylinder main body 6) in the first or second embodiment each have a sheet guiding device 10 is arranged adjacent to the transfer cylinder. In the arrangement of three transfer cylinders between the printing cylinders 3 is in the conveying direction of the first and the third transfer cylinder ever a Bogenleiteihrichtung 10 below allocated adjacent.
Each sheet guiding device 10 extends over the maximum width of the format and has at least one flow channel 12 coupled to a pneumatic system 11, which has an otherwise closed guide surface in the direction of the sheet conveying plane with a nozzle. 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.

By means of two sheet holding systems, a transfer region of two sheet-guiding cylinders, for example printing cylinder 3 and transfer cylinder (cylinder base 6), is formed. In a subsequent delivery area in the conveying direction sheet exit of the sheet guiding device 10, a first, coupled to an air source blower system 13 is arranged over the maximum format width, the Blasluftströmung is directed against the transfer cylinder (cylinder body 6) guided arc. Such a blown air flow is preferably directed in the direction of the cylinder axis of the cylinder main body 6.
In a further development of the blown air system 13, a blown air flow in the direction of the above-mentioned transfer area can additionally be generated for this blown air flow in the direction of the transfer cylinder.

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

Almost perpendicular to the cylinder axis and below the transfer cylinder or the cylinder main body 6, a second blow air system 14 coupled to an air source is arranged over the maximum format width. The second blown air system 14 is integrated in 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 blown air system 14 can be arranged below the plane of the guide surface of the sheet guiding device 10.
In this case, the blast air system 14 is always free, ie it is not covered by the guide surface.

The blown air flow of the second blown air system 14 is directed against the sheet guided on the transfer cylinder. In the conveying direction of the sheet material, the second blown air system 14 in turn is followed by a sheet guiding device 10 with a guiding surface in the arched area. The sheet follows in the conveying direction of the transfer area, for example between transfer cylinder (cylinder body 6) and the downstream pressure cylinder 3. The impression cylinder 3 forms with a blanket / blanket cylinder 3, a printing / Lackierzone, wherein in front of this pressure / Lackierzone a Druckzylinderblasvorrichtung 5 to support the bow guide is arranged.

In a preferred embodiment, the blown air flow of the second blown 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 inclined. In a development of the second blown air system 14, an additional blown air flow is directed at an approximately right angle perpendicularly in the direction of the cylinder axis of the cylinder main body 6.

Both blown air systems 13, 14 can be supplied separately from separate air sources or coupled by an air source. Thus, at least one separate air source for the blown air systems 13, 14 is provided, which is independent of a pneumatic system 11 of a sheet guiding device.

The pressure for both blown air systems 13, 14 is preferably separately controllable and is higher than the pressure of the pneumatically actuated sheet guiding device 10 with pneumatic system 13.
In a further embodiment, the distance of the blown air systems 13, 14 to the guide surface of the sheet guiding device 10 is variably adjustable. About the change in distance is also a pressure change feasible.

The described embodiments of the transfer cylinder (cylinder main body 6) with drum caps 7, 8 with a textile fabric or a coating 15 with sealing is not limited to the use of only one embodiment in a processing machine. Rather, a combination of transfer cylinders according to the first and the second embodiment within the coating machine is also feasible.

For example, a first transfer cylinder (cylinder base 6 with drum caps 7, 8) with a textile fabric on the drum caps 7, 8 can be arranged between two printing and / or coating units. For example, the first impression cylinder 3 of a printing / coating plant downstream of a turning device 4, such a transfer cylinder.
Alternatively, the delivery drum (cylinder base 6 or sprocket shaft with at least one drum cap 7 or 8) with a coating 15 with sealing layer on the Drum cap 7 or 8 downstream of a printing cylinder 3 of a printing / coating unit in the conveying direction

[REFERENCE LIST]

1

plate cylinder

2

Mold / blanket cylinder

3

pressure cylinder

4

turning device

5

Druckzylinderblasvorrichtung

6

Cylinder body (transfer cylinder)

7

First drum cap

8th

Second drum cap textile fabric

10

sheet guiding device

11

pneumatic system

12

Flow channel (with guide surface)

13

First blown air system

14

Second blown air system

15

Coating / sealing layer

R

radius

Claims (5)

1. A processing machine with sheet guiding cylinders and a sheet control device, wherein at least one sheet guiding cylinder comprises a cylindrical basic body (6) with at least one sheet holding system and at least one drum cap (7, 8) detachably arranged on the basic body, and wherein below the sheet guiding cylinder a flow channel (12) coupled with a pneumatic system (11) with a guiding surface adapted to the sheet conveying plane and comprising nozzles and which is otherwise closed is arranged and a first blowing air system (13) generating a blowing air flow for pushing out the sheet loop in the direction of the sheet guided on the cylinder basic body (6) is arranged upstream in conveying direction, wherein on the surface of the drum caps (7, 8) a paint/varnish-repellent coating (15) is arranged in a well-bonded manner, wherein the coating (15) is formed through the metals chromium, iron, titanium, nickel, cobalt, tungsten or molybdenum or at least contains parts thereof, and on the coating (15) a paint/varnish-repellent sealing layer is arranged in a well-bonded manner or on the surface of the drum caps (7, 8) a textile flat structure allowing a relative movement on the lateral area of the drum caps (7, 8) is arranged and wherein approximately perpendicularly to the axis below the cylinder basic body (6) a second blowing air system (14) generating a blowing air flow against the sheet guided on the cylinder basic body (6) is arranged and both blowing air systems (13, 14) extend over the maximum format width and are connected with at least one separate air source.
2. The processing machine according to Claim 1, wherein 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.
3. The processing machine according to at least Claim 1, wherein the pressure for both blowing air systems (13, 14) is controllable.
4. The processing machine according to at least Claim 1, wherein the second blowing air system (14) is arranged below the guiding surface of a sheet control device (10) in a freely positioned manner.
5. The processing machine according to at least Claim 1, wherein the sheet in conveying direction following a reversing device (4) lies on one of the drum caps (7, 8) with the printed side.

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