EP1834912B1 - Sheet material processing machine with a guide for the suspended transport thereof - Google Patents

Abstract

Guiding device comprises a guiding surface (13) with nozzles (17) arranged on the guiding surface across the conveying direction (3) for guiding a sheet material in a suspended manner. A further nozzle (16) is assigned to each nozzle directly on each side edge (19) outside of the maximum format. Each further nozzle is coupled with a blowing air source and is arranged with a blowing opening in the guiding surface to produce a vertical blowing air stream. Preferred Features: The further nozzles are arranged flush over each other with the guiding surface in the conveying direction.

Description

The invention relates to a processing machine, in particular a printing press or varnishing machine, according to the preamble of the independent claim 1.

A guide of this kind is made DE 44 27 448 A1 for the contactless guiding of sheet material in a printing press. The guide can be embodied in various arrangements of air nozzles, especially slot nozzles, in a guide surface. Thus, in one embodiment, air-jet nozzles are arranged in the conveying direction of the sheet material along an imaginary center line of the guide surface, the blow jets of which are directed essentially in the direction of conveyance. Furthermore, transversely to the conveying direction of the sheet material, with respect to the imaginary center line, air-jet nozzles arranged in mirror image whose jets are directed to the side edges of the guide surface.

Out DE 42 09 067 A1 is another sheet guiding device with Lufiblasdüsen in a guide surface known. The air-jet nozzles have different blowing directions, wherein the nozzles are formed in the middle region in the form of a polygon and outward in the direction of the side edges in a zig-zag arrangement. In the middle area, additional blowing nozzles are arranged, whose jet jets exit perpendicular to the guide surface. On the guide surface blocking rods are arranged in the region of the side edges, which are intended to counteract the outflow of the respective main flow. Alternatively, blowers are arranged on the side edges, whose blow jet is directed against the outflowing main flow.

GB-A-2 273 489 discloses a sheet delivery of a printing press, in which the gripper system on the leading edge of sheet grippers of a endlessly guided chains gripper arc over a broad field of air boxes arranged in air holes is floating and stored on a delivery pile. The air openings are directed vertically upwards or counter to the sheet conveying direction obliquely backwards, wherein the air openings are arranged in rows in the sheet-width field alternately. In this case, the upwardly directed air openings form a sheet supporting air cushion and the obliquely rearward air openings extend the gripped by grippers at the front edge against the direction of conveyance backwards.

DE 103234G8 A1 describes a sheet processing machine with a pneumatic sheet guiding device. The sheet guiding device comprises flow channels which have air passage openings arranged in the sheet guiding surface. The mouth cross-sections of the air passage openings are arranged in the form of along the conveying direction on a straight line, continuous or at a small distance following slots, which are arranged in the middle section of the sheet guide in the conveying direction mirror images of each other. In one embodiment, scavenging air streams can be dispensed in the center section of the sheet guiding surface, which can emerge perpendicularly from the sheet guiding surface through scavenging air openings, a series of scavenging air slots or a continuous scavenging air slot.

The slots have a length which is many times greater than their width and are arranged symmetrically to a centrally extending line of symmetry. In the conveying direction, a plurality of slots or slot rows, also parallel, can be arranged along a straight line.

In a further development, the slots can be in operative connection with exhaust air openings, which are arranged along a straight line, in order to prevent superimpositions of carrying air streams. By means of the slots Bogentragluftströme should be formed, the large space at the exit from the sheet guide form homogeneous air cushion. However, the slots are not arranged in mirror image in each one, in the conveying direction consecutive row with pointing in the direction of the side edges of the tread approximately at right angles to the conveying direction blowing openings for generating a Blasluftströmung, which is operatively connected to outside the maximum format arranged Schott nozzles.

The invention is based on the object to provide a processing machine of the type mentioned above, which allows a contactless guidance of sheet material with different format or grammage on a guide surface and ensures a process-stable flying height for the sheet material.

The object is achieved by the training features of independent claim 1. Further developments will become apparent from the dependent claims.

A first advantage is based on the fact that, starting from the center of a guide surface arranged guide surface opening into this guide surface nozzles, preferably slit nozzles are arranged in mirror image to each other, which are coupled to a Blasluftquelle and acted upon with Blastuft and in the direction of the two side edges of the guide surface (im Substantially transversely to the conveying direction) by means of their jets of blow to both side edges (the guide surface) each produce an outflowing Blasluftströmung (main air flow). By this approximately horizontal Blasluftströmungen (main flows) between the surface of the guide surface and the underside of the sheet material in the direction of the side edges of the sheet material is guided at a sheet edge by sheet holding means, for example in the gripper closure, contactlessly over the frame-fixed guide surface in a defined fly height.

It has been found that the flow behavior of the blast air flow or main air flow can be influenced in an advantageous manner by counteracting an accelerated outflow of the respective blast air flow / main air flow in the direction of the respective side edge. Here, in the closed on both sides of the side edge region of the guide surface per nozzle (for the Blasluftströmung / main flow) at least one, arranged at a distance Schott nozzle on the guide surface outside the Maximalformates the sheet material arranged in the conveying direction. Each nozzle that generates a blown air flow / main air flow to the side edge region, preferably designed as a slot nozzle, is assigned at least one bulkhead nozzle at a distance in the respective otherwise closed side edge of the guide surface. The Schott nozzles are coupled to a Blasluftquelle and each produce a vertical plane to the guide surface Blasluftströmung, which has a Abschottfunktion against the respective, approximately horizontal Blasluft- / main air flow and thus impedes the accelerated flow of the respective Blasluft- / main air flow to the two side edges. In this case, the distance between each nozzle generating the blown air flow / main air flow and at least one associated bulkhead nozzle may be different, individually or in the conveying direction.

As a second advantage, it can be stated that a row of nozzles for the blown air flow / main air flow is arranged in the region of the center of a guide surface in the conveying direction of the sheet material to the side edges, which are mirror images of each other (with the back facing). Between each two of these with their blast openings arranged in mirror image nozzles at least one coupled with a Blasluftquelle supporting nozzle is arranged, which produces a vertical, directed towards the underside of the sheet material, the sheet material supporting Blasluftströmung the plane of the guide surface. The respective support nozzle is arranged in the region of a pressure sink present between the two mirror-symmetrically arranged nozzles. Preferably, each support nozzle is arranged centrally between each two arranged in mirror image to each other nozzles. By means of the Blasluftströmung from the support nozzles a non-contact sheet guide is supported in the pressure sink and ensures a process-stable Schwebeführung.

A third advantage is that a combined arrangement of support nozzles in the central region of the guide surface (between two mirror-inverted nozzles) and bulkhead nozzles in the respective side edge region of the guide surface can be realized to ensure contact-free sheet guiding and process-stable flying height of the sheet material.

Fig. 1

eine Bogendruckmaschine mit Leiteinrichtungen,

Fig. 2

eine Leiteinrichtung als Beispiel ,

Fig. 3

eine Leiteinrichtung in erster Ausbildung,

Fig. 4

den mittleren Bereich einer Leitfläche der Leiteinrichtung,

Fig. 5

den mittleren und seitlichen Bereich einer Leitfläche der Leiteinrichtung.

The invention will be explained in more detail using an exemplary embodiment. Here are shown schematically:

Fig. 1

a sheet-fed printing machine with guide devices,

Fig. 2

a guiding device as an example,

Fig. 3

a guide in the first training,

Fig. 4

the central region of a guide surface of the guide,

Fig. 5

the middle and side region of a guide surface of the guide.

According to Fig. 1 is an example of a sheet-fed rotary printing machine with a feeder 4, shown in the conveying direction 3 of the sheet material several printing units 1, a coating unit 2 and a boom 5. The printing units 1 and the coating unit 2 have known details such as plate cylinder or forme cylinder 9 and blanket cylinder 8. The respective plate cylinder 9 in the printing unit 1 is assigned an inking unit and, if necessary, a dampening unit. In the coating unit 2 is the form cylinder 9, a metering system 10, preferably a chambered doctor blade with raced applicator roller assigned. The blanket cylinders 8 and the forme cylinder 9 are associated with pressure cylinder 6 adjacent as a sheet guiding cylinder. Between the printing cylinders 6 transfer cylinder 12 are arranged as a sheet guiding cylinder for the sheet transport. The feeder 4 adjacent printing unit 1 additionally has a sheet material leading transfer cylinder 12 as an investment drum. The blanket cylinders 8, cylinders 9 and cylinders 6, a cleaning device 7 is preferably assigned.

In the conveying direction 3, a guide device 11 is provided for the sheet transport at locations where the sheet material from the minimum format 14 to the maximum format 15 for contact with machine parts tends. In the present example, such a guide 11 is below the transfer cylinder 12 and in the boom 5 below the rotating Bogenfördersysteme, if necessary in modular Stringed together, arranged.

In Fig. 2 For example, a guide 11 as an example, which does not fall under the claimed invention, but is useful for understanding, is shown in plan view. This guide 11 consists of a continuous across the machine width, closed guide surface 13, which has nozzles 17 opening into the guide surface 13. The coupled with a blown air source nozzles 17 are, preferably as slit nozzles, incorporated obliquely into the guide surface 13 and work on the principle of the aerodynamic paradox. A slot nozzle of this kind is for example off DE 1 907 083A known.

The nozzle assignment of the guide surface 13 is as follows: starting from a center 18 of the guide surface 13, the nozzles 17 are mirror images of each other and with their blowing openings 21 for generating one Blasluftströmung 22 (main flow) substantially transversely (in plan view approximately at right angles) to the conveying direction arranged in the direction of a respective oppositely disposed side edge 19 of the guide surface 13. The wording "transversely to the conveying direction 3" is not limited to an arrangement which is rectangular in plan view with respect to the conveying direction 3 of the nozzles 17 arranged in mirror image. Rather, this also includes in or against the conveying direction 3, directed at an angle to the side edges 19, arranged in mirror image nozzles 17 a. On the guide surface. 13, the nozzles 17 are arranged consecutively in the conveying direction 3.

Substantially transversely to the conveying direction 3, the nozzles 17 are arranged in an extension on the guide surface 13, which can lead a sheet material in the maximum format 15 floating. Each of the respective side edge 19 directly associated nozzle 17 is assigned outside the maximum format 15 on the otherwise strip-shaped closed guide surface 13 at least one bulkhead nozzle 16 at a defined distance. Each bulkhead nozzle 16 is arranged vertically with the blow opening in the guide surface 13 and also coupled to a blown air source. By means of the bulkhead nozzles 16, with reference to the surface of the guide surface 13 in the respective region of the side edge 19, a vertical blown air flow is generated which is opposite to a blown air flow 22 generated by the nozzles 17 (Main flow) for the Schwebeführung of the sheet material has a Abschottfunktion and impeded the flow of the respective Blasluftströmung 22 to the side edges 19. Preferably, the bulkhead nozzles 16 are arranged in the conveying direction 3 successively on the otherwise strip-shaped closed guide surface 13 aligned (in at least one row). In a further embodiment, more of these bulkhead nozzles 16 are assigned outside the maximum format 15 on the guide surface 13 at a distance of the nozzle 17 per 17 directly associated nozzle per the respective side edge 19. The bulkhead nozzles 16 can be arranged with respect to the blow opening 21 of the respective nozzle 17 at a radial distance (in plan view, for example, in an ellipse / circle segment) to the blow opening 21. Taking into account that the bulkhead nozzles 16 are arranged outside the maximum format 15 on the guide surface 13, the distance between at least one bulkhead nozzle 16 and the immediately adjacent nozzle 17 can be of different sizes

When sheet transport in the conveying direction 3 by the processing machine can be deflected inclinedly in the conveying direction 3 to the side edges 19 out due to the drag flow generated by the sheet material emerging from the blow holes 21 Blasluftströmung 22.
In this case, the Blasluftströmung 22 is not - as in Fig. 5 shown - straight, but the Blasluftströmung 22 and the associated print carpet are deflected in the conveying direction 3 to the respective side edge 19 in each case an angle. To improve the Abschottfunktion can be arranged in this case at least one Schott nozzle 16 with respect to the blow opening 21 of the immediately adjacent nozzle 17 in a preferably radial, directed in the conveying direction 3 distance.

In a preferred embodiment, the distance between the blowing openings 21 of the respective nozzles 17 and the associated bulkhead nozzles 16 is greater than the distance between the blowing openings 21 and the maximum pressure (in the printing carpet) of the blown air flow 22 originating from the respective blowing opening 21.

In Fig. 3 a guide 11 is shown in a first embodiment in plan view. This guide 11 is analogous to Fig. 2 formed with a guide surface 13, nozzles 17 and the same nozzle assignment.
Starting from the middle 18 of the guide surface 13, the nozzles 17 are again mirror images of each other and with their blowing openings 21 for generating the Blasluftströmung 22 (main flow) substantially transversely (in plan view approximately at right angles) to the conveying direction 3 in the direction of a respective oppositely disposed side edge 19 of the guide surface 13 arranged. On the guide surface 13, the nozzles 17 are again arranged successively in the conveying direction 3.

Specially in Fig. 4 For this purpose, a detail in plan view from the central region of the guide surface 13 is shown. Between each of the two in the middle of 18 mirror images of each other adjacent nozzles 17, ie with the back facing nozzles 17, at least one support nozzle 20 in the region of a pressure sink 23 (area with reduced pressure or negative pressure) is arranged. Through the blown air flows 22 (main flow) flowing out of the blowing openings 21 with reference to the center 18 in a mirror image after the side edges 19, a print carpet with a pronounced overpressure zone for the floating guidance is formed. Contrary to the Blasluftströmungen 22 is formed between the mirror-image arranged nozzles 17 in the respective pressure sink 23, a negative pressure zone. By the blowing air of the support nozzles 20, the negative pressure area is approximately equalized in each pressure sink 23, so that a lubrication-free Schwebeführung of the sheet material is ensured even in the middle of 18.

For this purpose, each support nozzle 20 is coupled to a blown air source and has a blow opening in the guide surface 13, which generates a vertical Blasluftströmung towards the underside of the sheet material to the surface of the guide surface 13. Preferably, each support nozzle 20 is arranged centrally between the two nozzles 17 in the pressure sink 23. Preferably, the support nozzles 20 are aligned in the conveying direction 3 successively on the guide surface 13, preferably along the center line (center 18), arranged in the respective pressure sink 23.
The support nozzles 20 compensate for the suction effect of the pressure sink 23, which between two each with the back opposite (mirror image arranged) nozzles 17, in particular slot nozzles, forms.

In a further development, the nozzles 17 and the bulkhead nozzles 16 can be arranged in combination with the support nozzles 20 on the guide surface 13, as described. The nozzles 17, bulkhead nozzles 16 and support nozzles 20 can each be coupled to a separate blower air source supplying one or at least two or all of the nozzle types.
In a preferred embodiment, the guide surface 13 is the top surface of a box-shaped flow channel, which is coupled to a Blasluftquelle, for example, a plurality of fans.

LIST OF REFERENCE NUMBERS

1 -

printing unit

2 -

coating unit

3 -

conveying direction

4 -

investor

5 -

boom

6 -

Printing cylinder (sheet guiding cylinder)

7 -

cleaning device

8th -

Blanket cylinder

9 -

Plate / form cylinder

10 -

dosing

11 -

guide

12 -

Transfer cylinder (sheet guiding cylinder)

13 -

baffle

14 -

minimum format

15 -

maximum size

16 -

Schottdüse

17 -

jet

18 -

center

19 -

margin

20 -

Stützdüse

21 -

Blow opening (from nozzle 17)

22 -

blast air flow

23 -

pressure sink

Claims (6)

1. A processing machine for sheet material with a guide (11), comprising a guiding surface (13) for the suspended guidance of sheet material, wherein the otherwise closed guiding surface (13) is penetrated by nozzles (17) terminating in this guiding surface (13) which are coupled with a blowing air source and through which blowing air can flow and the nozzles (17) in conveying direction (3) are arranged following one another and transversely to the conveying direction (3) starting from the middle (18) in mirror image relative to one another in the direction of the lateral edges (19) each achieving a blowing air flow (22) by means of blowing jets, wherein the nozzles (17) are arranged on the guiding surface (13) in an extension which guide sheet material in the maximum format (15) in a suspended manner,
   in the middle (18) of the guiding surface (13) between two nozzles (17) arranged adjacent to each other in mirror image, each creating a blowing air flow (22) in the direction of the lateral edges (19) at least one support nozzle (20) is centrally arranged in the region of a pressure trough (23),
   each support nozzle (20) is coupled with a blowing air source and with the blow opening is arranged in the guiding surface (13) for creating a vertical blowing air flow,
   wherein starting from the middle (18) of the guiding surface (13) the nozzles (17) arranged in mirror image are each arranged in a row following one another in conveying direction (3) for creating a blowing air flow (22) and each comprise blow openings (21) arranged in the direction of the lateral edges (19) at a right angle or approximately at a right angle to the conveying direction (3),
   and each nozzle (17) directly assigned to the respective lateral edge (19) outside the maximum format (15) on the otherwise closed guiding surface (13) at least one bulkhead nozzle (16) is assigned at a defined distance and
   that each bulkhead nozzle (16) is coupled with a blowing air source and with the blow opening is arranged in the guiding surface (13) for generating a vertical blowing air opening.
2. The processing machine according to Claim 1,
   characterized in that
   each support nozzle (20) is arranged aligned along the centre line (middle 18) in conveying direction (3) on the guiding surface (13).
3. The processing machine according to Claim 1,
   characterized in that
   the bulkhead nozzles (16) in conveying direction (3) following one another on the otherwise closed guiding surface (13) are arranged in alignment.
4. The processing machine according to Claim 1,
   characterized in that
   for each nozzle (17) a plurality of bulkhead nozzles (16) are arranged downstream at a distance outside the maximum format (15) on the guiding surface (13).
5. The processing machine according to Claim 1,
   characterized in that
   one or a plurality of bulkhead nozzles (16) with respect to the blow opening (21) of the nozzle (17) are arranged at a radial distance.
6. The processing machine according to Claim 1,
   characterized in that
   the distance between the blow openings (21) of the respective nozzles (17) and the assigned bulkhead nozzles (16) is greater than the distance between the blow openings (21) and the pressure maximum of the blowing air flow (22) issuing from the respective blow opening (21).

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