EP1099552B1 - Pneumatic sheet guiding device in a printing press - Google Patents

Abstract

The pneumatic sheet feed system, for a sheet-fed printing press, has a tubular outer section (1) and a concentric and rotating inner tubular section (2), linked to a drive for its rotation. Both tubular sections (1,2) have several rows of control openings (4-7) which are exposed and closed by the rotation of the inner section (2). At least the inner section (2) is supplied with blowing or suction air.

Description

The invention relates to a pneumatic sheet guiding device in a printing press according to the preamble of Main claim.

[State of the art]

A sheet guiding device of this type is out EP 0 802 053 A1 is known. On a hollow blowpipe are over the format width of several of the curvature of a printing press cylinder adapted guide elements arranged, the outlet openings for pressing the sheet onto the outer surface of the Have cylinders with air. Everyone is on the blowpipe Guide element an actuator for switching on and off Blown air assigned. Each actuator instructs Closure element, which one between each guide element and assigned to the blow pipe arranged throughflow opening is.

Another sheet guiding device is known from DE 36 08 795 A1 known. Then the arrangement is before and after a pressure zone a blowpipe acting across the width of the arc known with nozzles, an actuator between the arc and blowpipe exhibit.

The disadvantage is that the sheet guiding devices are relative are complex and can only be operated with blown air are. From DE 36 08 795 A1 are taking into account the aspect no information can be found in the sheet format. Air outlet openings that go beyond the sheet format are known to have a negative effect on the sheet guidance, since can be blown at the side edges of the sheet. This leads to a restless sheet run and promotes the risk of greasing.

DE 195 30 039 C2 describes a blowing device in a printing press to support the sheet guidance on a cylindrical Body while avoiding blowing the side edges and known considering the basis weight. Here is an inner blowpipe - when processing Cardboard - or the inner and one outer blowpipe - at Processing of paper - to support the sheet guidance used. The outer blow pipe has nozzle holes Influencing the arch in the edge area. The inner tube is fixed to the outer tube and faces the outer tube penetrating holes to influence the arc in the Midrange. Blowing air is optionally available through switching valves the inner blowpipe or the inner one and the outer blowpipe can be realized.

The disadvantage here is that the blowing device is relative is complex and too little the different format widths sheet-shaped substrates in a printing machine. In addition, the sheet guiding device can only be operated in blown air mode.

A device that is used exclusively in suction air mode is controllable, is known from DE 198 16 313 A1 and is in a turning drum for suction air control of the suction system used. The device has rotary vane by default for suction air control for individual adjustment sections on. Several suction chambers are juxtaposed in sections controllable with suction air, whereby within the Section of each suction chamber by means of an oscillating shaft stored control shaft can be acted upon with suction air. The rotatable control shaft - each section assigned (with suction chambers) and distributed over the circumference - several axial, circumferentially connected control channels of different Length on to bores of the suction chambers with suction air head for.

From EP-A-0883 279 a plate exposure device is known in which the recording medium, especially the pressure plate, using vacuum slots on a support surface a drum can be fixed. Between the vacuum source and the slots a drain manifold arranged for the targeted intake of air. The drain manifold has parallel arranged, provided with holes cylinder channels, wherein the holes are connected to the vacuum slots via conduit channels. The cylinder channels are preferably by means of a master cylinder, the one provided with openings Has rotary piston, can be targeted with a negative pressure.

According to DE-A-38 35 266, a sheet guiding device is known which can be operated in two operating modes. In the first mode of operation, a plurality of rollers arranged at intervals and adjustable to pressure-free areas are used as sheet guiding elements on a tube which extends across the width of the printing press.
In the second mode of operation, the sheet is guided pneumatically. For this purpose, a second tube, which is stored in the tube, is acted upon by blown air, which flows out from nozzles distributed over the tube in the direction of the sheet material. The second tube is coupled by means of a drive mechanism, so that the second tube can be moved vertically and the nozzles of the second tube can pass through openings in the first tube. This mode of operation can be used for sheet material that has no pressure-free areas.

OBJECT OF THE INVENTION

The invention has for its object a pneumatic Sheet guiding device of the type described in the introduction create that avoids the disadvantages mentioned is adjustable to the sheet format to be processed and can be operated with blown air or suction air.

According to the invention, this is solved by the training features of the main claim. Further training results from the Dependent claims.

A first advantage is due to the fact that the invention Sheet guiding device has a simple structure and can be produced with little effort.

Another advantage is that this pneumatic sheet guide device universal within a printing press, especially a rotary printing press, along the sheet transport path can be used. Here is the individual arrangement a pneumatic sheet guide device as well an adjacent multiple arrangement of this pneumatic Sheet guiding devices can be implemented and depending on requirements is the sheet guiding device with variable format Blowing air or suction air can be applied.

For example, the sheet guiding device according to the invention before and / or after a printing nip (a printing unit or a coating unit) as a pressure cylinder blowing device used. It is also in the sheet outlet of a sheet guide cylinder, e.g. below the transfer area of two Bow holding systems, can be used. When created in straight printing Bow is the sheet guiding device in suction air mode and for sheets that are created in face and reverse printing these can be operated in blown air mode.

The sheet guiding device according to the invention is independent from an assignment to a sheet guide cylinder also in Boom can be used to support sheet transport. Depending on the requirement, a blown air mode is available for the lubrication-free sheet transport or suction air operation, e.g. for hovering or for frictionally guiding the bends, realizable.

In an embodiment of the pneumatic sheet guiding device, it is advantageous that it can be designed as a sheet holding system to which suction air can be applied in a sheet guiding cylinder.
The sheet guiding device according to the invention can preferably be used here as a tubular suction system with suction devices arranged at intervals in the axial direction in a turning device, for example a turning drum.

A major advantage is that the connection or disconnection of blowing or suction air in the sheet guiding device according to the invention format variable is feasible. This points the pneumatically actuated sheet guiding device at least a number of across the maximum format width a printing machine reaching openings in the Range between minimum format and maximum format can be switched on or can be switched off for the passage of air.

Finally, it is advantageous that the sheet guiding device for symmetrical and asymmetrical sheet processing can be used in a printing press. With asymmetrical The sheet guiding device is also sheet processing Can be used in a variety of formats.

[Examples]

Fig. 1

eine pneumatisch beaufschlagbare Bogenführungseinrichtung in zweiteiliger Ausbildung,

Fig. 2

ein Lochbild des ersten Teiles gemäß Figur 1,

Fig. 3

ein Lochbild des zweiten Teiles gemäß Figur 1.

The invention will be explained in more detail below using an exemplary embodiment. The following schematically show:

Fig. 1

a pneumatically actuated sheet guiding device in two parts,

Fig. 2

2 shows a hole pattern of the first part according to FIG. 1,

Fig. 3

2 shows a hole pattern of the second part according to FIG. 1.

There are several printing units in a sheet-fed rotary printing press, preferably offset printing units, with sheet-guiding printing cylinders, Blanket cylinders, plate cylinders and at least Inks arranged in a row. The sheet transport is by means of Transfer cylinders between the printing units can be realized.

In sheet-fed rotary printing presses for the Schön- and Schön- and back pressure is one between at least two printing units Arranging device for the sheets arranged, which is preferred is operable according to the principle of trailing edges. The Turning device is for example as a single drum application formed and has in addition to at least one gripper system a suction system as sheet retention systems. It is Suction system through the sheet guide device according to the invention educated.

Another training is in a printing unit / coating unit before and / or after a pressure zone, e.g. from blanket cylinder and pressure cylinder formed, a blowing device arranged, which means guiding a sheet on the impression cylinder Blown air jets supported. Here is the blowing device formed by the sheet guide device according to the invention.

The pneumatic sheet guide device has according to the invention The following structure: It is a tubular outer part 1 provided that at least over the maximum format width a printing press is sufficient and at least in the axial direction has a series of openings 3 for the passage of air. The openings 3 extend over the maximum format the printing press. The openings 3 are, for example, in training at a defined angle, especially in Outside area, arranged obliquely to the arch in the blown air mode in the direction of conveyance or in the direction of the side edge.

The openings 3 are e.g. when training the invention Sheet guiding device as a pressure cylinder blowing device directed to the outer surface of the printing cylinder to blow air on the pressure cylinder in the gripper closure directed bow.

When the sheet guiding device is designed as a suction system a turning drum with an outer part 1 as a suction tube are on the pivotally mounted outer part 1, under Taking into account the gripper pitch at intervals in the axial direction, Suction fingers for sucking the trailing edge of the sheet arranged. In this training, the suction fingers wear Openings 3 for the passage of air, which with the interior of the outer part 1 (suction pipe) on the line side in functional connection are.

A tubular inner part 2 is concentrically assigned to the tubular outer part 1 so that it can rotate and is preferably axially movable. The tubular inner part 2 has at least one row of control openings 4 in the axial direction for controlling the passage of air, which extend at several intervals 8 to 15 across the maximum format width of a printing press in the axial direction. The maximum format is thus defined by the distances 8 to 15.
Furthermore, the tubular inner part 2 has further rows of control openings 5, 6, 7 for the variable-format control of the air passage in the axial direction, which are arranged circumferentially on the inner part 2 analogously to the control openings 4.

In each row of control openings 4 or 5 or 6 or 7 (Inner part 2), the distances 8 - 15 are in the same division the distances between the openings 3 (outer part 1). there the control openings 7 extend at intervals 11, 12 about the minimum format width of a printing press. The Minimal format is thus through the control openings 7 with the Distances 11, 12 defined. The between the minimal format and the further format arranged further rows of control openings 5 with the distances 9 to 14 or control openings 6 with the distances 10 to 13 preferably correspond to Format widths which can usually be processed in printing presses. The rows of control openings 4-7 are preferably at intervals 8 - 15 for the maximum format at intervals of 11.12 for the minimal format has multiple levels, especially for intermediate formats, arranged.

The outer part 1 and the concentrically inserted inner part 2 are tightly arranged on the end face. At least the inner part 2 is connected to an air generator by means of at least one axially and / or radially feeding supply line in order to optionally supply the sheet guiding device with suction air or blown air. At least the inner part 2 is rotatable, preferably additionally axially movable, to the outer part 1. The inner part 2 can be rotated about the axis manually or by means of an actuating device in defined positions corresponding to the rows of control openings 4-7.
The inner part 2 is also preferably axially movable to the outer part 1. This is advantageous, for example, for asymmetrical sheet processing in the printing press. In this case, after a row of the inner part 2 with the corresponding control openings 4 or 5 or 6 or 7 is positioned congruently to a row of openings 3 of the outer part 1, the inner part 2 is axially movable relative to the outer part 1. The control openings 4 or 5 or 6 or 7 can be moved axially offset by at least a distance of the distances 8-15 and can be fixed in the end position, which corresponds to the difference between the originally symmetrical and asymmetrical sheet processing. The prerequisite here is that the distances 8-15 from control openings 4-7 to openings 3 are the same. The positioning of the inner part 2 can preferably be achieved by means of a ball catch using an actuating device.

The pneumatic sheet guiding device is depending on the requirement in the operating modes "blown air mode" or "suction air mode" clocked operable.

The outer part 1 can be fixed to the frame or rotated, e.g. by means of an actuator his. The rotatable mounting of the outer part 1 is for example advantageous if the sheet guiding device as a pressure cylinder blowing device at different angles of inclination Blast air jets aimed at the bow.

Each actuating device with a central is preferred Control, e.g. a control center, a printing press in terms of circuitry connected so that at least twisting the Inner part 2, if necessary also turning the outer part 1, can be carried out automatically. In further training is in addition to the rotation of the inner part 2, its axial Movement can be carried out automatically.

Is an arc-shaped substrate in the printing press To process maximum format, that's the tubular inner part 2 rotatable to the row of openings 3 of the outer part 1, such that an overlap of the openings 3 with the control openings 4 is present. In this position, the inner part 2 positioned to the outer part 1. Should be an arch-shaped substrate with a reduced format width (down to the minimum format) are processed, they are over the respective format width beyond 3 openings closed by Twist the inner part 2 (and if necessary, uncovered again). For this purpose, the inner part 2 with the control holes 5 or 6 or 7 rotated so that the relevant one Row of control holes 5 or 6 or 7 with openings 3 of the outer part 1 is in individual overlap. The end arranged openings 3 are through the remaining Solid material of the inner part 2 closed with it.

For example, only the control openings are in minimal format 7 at a distance 11, 12 with the corresponding openings 3 of the outer part 1 in functional connection and the end Openings 3 (distances 8 to 10; 13 to 15) are closed.

The statements are not based on the number specified here Openings 3 and control openings 4 to 7 limited. Much more are further rows of control openings on the circumference Inner part 2 for different format widths, preferably graduated, can be arranged. The openings 3 and the control openings 4 - 7, including additional openings (3 or 4-7), are preferably designed as bores or slots.

[REFERENCE LIST]

1

outer part

2

inner part

3

openings

4

control port

5

control port

6

control port

7

control port

8th

distance

9

distance

10

distance

11

distance

12

distance

13

distance

14

distance

15

distance

Claims (5)

1. Pneumatic sheet guide device in a press, having openings for the passage of air, which, on the line side, is connected to an air generator, having a tubular outer part (1) which extends over the maximum format width and has at least one row of openings (3) extending in the axial direction, characterized in that the outer part (1) is concentrically assigned a tubular inner part (2) such that it can rotate, at least the inner part (2) being connected to the air generator in order to supply the sheet guide device with blown air or vacuum as desired, in that the inner part (2) has on the circumference a plurality of rows of control openings (4 - 7), which are arranged in variable format in the axial direction at intervals (8 - 15), and in that, when the inner part (2) is rotated and positioned, an overlap can be achieved between at least one row of openings (3) of the outer part (1) and at least a selected row of control openings (4, 5, 6, 7) of the inner part (2).
2. Pneumatic sheet guide device according to Claim 1, characterized in that the inner part (2) is functionally connected to an actuating device.
3. Pneumatic sheet guide device according to at least Claim 1, characterized in that the rows of control openings (4 - 7) are arranged to be stepped, starting from intervals (8 - 15) for the maximum format to intervals (11, 12) for the minimum format.
4. Pneumatic sheet guide device according to at least Claim 1, characterized in that the inner part (2) can be moved axially and positioned in relation to the outer part (1).
5. Pneumatic sheet guide device according to Claim 4, characterized in that the inner part (2) can be moved axially by at least one interval, from the intervals (8 - 15), which corresponds to the difference between symmetrical and asymmetrical sheet processing, the intervals (8 - 15) between control openings (4 - 7) and openings (3) being equal.

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