JPH11227162A - Sheet guding device for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet guiding device for a printer to guarantee a good introduction of a printed matter into a printing gap by uniformly guiding the matter on a sheet guiding cylinder or particularly on an impression cylinder. SOLUTION: The sheet guiding device 9 comprises a sheet smoothing unit 17 coupled to a pneumatic mechanism 18 for supplying the air, and a guide surface 20 disposed in front of a printing gap 12 in a conveying direction 8 of a printed matter. In order to remove a curl by orienting the matter against a conveying direction 8, the unit 17 is associated with the guide surface 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet guiding device for a printing press, which is provided in a wedge-shaped space in the conveying direction of a printed material, before a printing gap formed by a plate cylinder and a sheet guiding cylinder. It is of the type arranged axially parallel to the sheet guide cylinder.

[0002]

2. Description of the Related Art A sheet-fed printing press for duplex printing on a BB-type principle in a given printing zone is known from DE-OS 26 03 483 A1. In this case, the sheet guide device is arranged in the direction of transport of the printed material with a first blowing tube, which is connected to the compressor and has an opening, and the blowing air jet of the blowing tube feeds the printed material to the paper feed cylinder. To prevent contact between the printed material and the lower rubber blanket cylinder (sheet-fed paper cylinder) just before the printing gap. In front of the printing gap, a further suction box is arranged, which has a concavely curved suction surface, which serves for the suction of the print.
The printed product is thereby guided as long as possible against the suction surface before the printed product contacts the lower rubber blanket cylinder shortly before the printing gap. The suction box is connected to a vacuum source. Behind the printing gap there is arranged a second blowing tube, the so-called Luftschwert, from which the blowing air flows into the surface of the upper rubber blanket cylinder and into the printing gap itself. .

[0003] Further spraying devices are known which are arranged in the direction of transport of the printed material, shortly before the printing gap between the rubber blanket cylinder and the impression cylinder. This known spraying device is known as M.R.
In the Roland 800 of the series by MAN Roland Druckmaschinen AG, a rotary printing press based on the five-cylinder principle from 1978 to 199
It had been used and sold until 5 years. The spraying device is formed from a number of guide members which are spaced apart from one another in the body axis direction and are adapted to the curvature of the impression cylinder circumference. in this case,
Each guide member has a hollow cylindrical cross section. Each guide member is obliquely arranged on the wall and has a blowing air opening directed in the direction opposite to the conveying direction of the impression cylinder and the printed material. As a result, it is possible to prevent the sheet from being lifted up from the pressurized peripheral surface. The inside of the hollow cylindrical guide member forms a blowing air chamber, which is connected to a pneumatic mechanism for supplying blowing air.
The wall of the guide member with the blowing air opening has an outer contour adapted to the peripheral surface of the impression cylinder. In addition, additional small blowing air openings are arranged, which are directed inward and outward in the edge region of the guide member when viewed transversely to the direction of movement. .

[0004] From EP-A-0695715, a sheet straightening device (smoother) for guiding sheet-like printed products in a delivery device of a rotary printing press is known. This known sheet straightening device is used for removing curled straightness of printed matter and is incorporated in a guide device. Regarding the guide trajectory of the guide device,
The sheet straightening device is slightly recessed from its orbital plane and serves to remove the curl of the sheet in a sheet-like print on one side. A guide member for shielding the sheet straightening device under the printed material printed on both sides is movable in the space between the sheet straightening device and the guide track, and is thereby substantially closed. A guided trajectory is formed. In this case, it is not avoided that the printed material is placed unevenly on the impression cylinder or the lower rubber blanket cylinder, in particular in the region of the trailing edge of the sheet material.

[0005]

SUMMARY OF THE INVENTION The object of the invention is to avoid the drawbacks mentioned above and to enable a uniform guidance of the printed product on a sheet-guiding cylinder, in particular on an impression cylinder, and to achieve a better control over the printing gap of the printed product. The object is to provide a sheet guiding device in a printing press of the type mentioned at the outset, which guarantees a good introduction.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, according to an embodiment of the present invention, a sheet guiding device includes a sheet straightening device connected to a pneumatic mechanism for supplying air, and a printed material. And a guide surface provided in front of the printing gap in the conveying direction, and the sheet straightening device is incorporated into the guide surface in order to stretch the printed matter against the conveying direction and to curl the printed material. I did it.

[0007]

In the printing process and the varnishing process, especially in the case of a print having a small weight per unit area, the rear region of the sheet-like print tends to curl. Such effects become stronger as the number of printing or varnishing gaps in the printing press increases. In printing presses that can switch from front-side printing to double-sided printing or from double-sided printing to front-side printing, the printing device / varnishing device is placed in front of a reversing mechanism which acts in the direction of transport of the printed material, for example according to the principle of rear edge reversal. This effect is particularly disadvantageous when the reversing mechanism is further followed by a printing device / varnishing device in the transport direction. Print curl leads to undesired misregistration and dullness. A similar effect is observed in the case of a printed material which is already printed or varnished on one side and is supplied to a printing apparatus / varnishing apparatus from the inverted feed pile to a new printing apparatus / varnishing apparatus with the unprinted side facing up.

[0008] In order to achieve a smooth and non-flapping guidance of the sheet-shaped print on the peripheral surface of the sheet guide cylinder, a rubber blanket cylinder (for a printing device) or ( A pneumatically loadable sheet guide according to the invention is arranged before the wedge-shaped printing gap consisting of the plate cylinder (for a varnishing device) and the sheet guide cylinder, preferably an impression cylinder. The lower side is adjacent to the sheet guide cylinder as a guide surface.

In this case, the sheet guiding device is arranged before the printing gap, in this case between the guide surface of the sheet guiding device and the peripheral surface of the sheet guiding cylinder, for example the impression cylinder. To
An inlet gap for the printed product is formed, which taper extends in the transport direction toward the print gap. The sheet guide device is arranged axially parallel to the sheet guide cylinder.

According to a first measure of the invention, the sheet guiding device comprises at least one sheet straightening device extending at least over a minimum sheet width at a guide surface facing the sheet guiding cylinder. have. The sheet straightening device is integrated in the sheet guide, in particular on its guide surface, and has at least one straightening gap;
It is operatively associated with the pneumatic mechanism. In the transport direction of the printed material, the sheet straightening device is arranged at the start of the sheet guide device (opposite the printing gap), in which case another part of the sheet guide device is at least guided. As a surface, it extends to the vicinity of a wedge-shaped printing gap.

The sheet guiding device according to the invention is particularly suitable for printed products whose surface is not printed, that is to say those that do not have an ink layer and / or a varnished layer. Furthermore, the invention is advantageously configured such that the sheet straightening device can be shielded. That is, the cover is aligned with the guide surface, so that the sheet guide device can also be used as a guide surface for printed products having a printed surface.

According to a second measure, the sheet straightening device has at least one row of spray and suction nozzles arranged on the guide surface and spaced apart from each other and operatively connected to the pneumatic mechanism. I have. These spray and suction nozzles extend at least over a minimum paper width.
These spraying / suction nozzles are directed obliquely to the conveyance direction of the printed matter on the guide surface.

[0013] In a further embodiment, another sheet guiding device is arranged adjacent to the sheet guiding device (having a sheet straightening device) which is arranged in the transport direction in front of the printing gap. (Having no sheet straightening device) are arranged following the printing gap. The sheet guiding device serves for guiding the printed material as it leaves the printing gap. The sheet guiding device downstream of the printing gap can likewise be loaded pneumatically, so that the blowing air flowing out of the opening acts on the printed material by means of the pressing energy.
In this case, the sheet-guiding device has at least one pneumatically loadable chamber, in which an opening for the printed product is provided for blowing air outflow. In a further development, the sheet guiding device has a plurality of chambers, which are separated by partitions and are separately connected to a pneumatic mechanism for the supply of blowing air. Alternatively, a configuration with a pneumatic mechanism with only one blowing air supply is also possible.
In this case, the blowing air supply reaches the chamber adjacent to the printing gap, and the blowing air flows back to another chamber through an opening in the partition.

A discharge gap is formed between the lower surface (guide surface) of the sheet guide device and the peripheral surface of the sheet guide cylinder, the discharge gap having a gap that is enlarged in the transport direction starting from the printing gap. I have.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention.

A sheet-fed rotary printing press is shown in a row configuration as shown in FIG. In this case, a plurality of printing apparatuses 1 having the impression cylinders 10 are arranged adjacent to each other, and are connected to each other by the transport drum 4 or the reversing mechanism 3. The transport drum 4 and the reversing mechanism 3 have a sheet guide device 7 assigned thereto. A paper ejection device 2 is provided after the last printing device 1. The paper discharge device 2 conveys the printed material in a conveying direction 8 along a sheet guide device 7 via a sprocket shaft 5 and a circulating chain mechanism 6, and places the printed material on a paper discharge device pile. As is known, each printing device 1 comprises an impression cylinder 10, a rubber blanket cylinder 11, and a plate cylinder. An inking unit and possibly a dampening unit are assigned to the plate cylinder. These are not described further here.

In sheet-fed rotary printing presses in a row configuration, known as in-line processing, one or more varnishing devices can be assigned to the printing device. In this case, one varnishing device is one printing device 1
Is comparable to The rubber blanket cylinder 11 of the printing device corresponds, in a known manner, to the plate cylinder of the varnishing device operatively connected to the setting roller and the varnishing metering mechanism. Impression cylinder 10
Performs the function of a sheet guiding cylinder in a varnishing device.

The rubber blanket cylinder or plate cylinder 11 and the impression cylinder 10 form a printing gap 12, through which a sheet-like printed material is conveyed when the printing cylinder is inserted and printed or printed. It is varnished. For example, in the case of controlling the flow of paper or in the case of a printing cylinder punching which is selectively performed when the printing device or the varnishing device 1 is unnecessary, the sheet guide device 9 is operated and the outer circumference of the impression cylinder 10 is kept. The printed material placed on the surface passes through the print gap 12 without contacting the blanked blanket cylinder / plate cylinder 11.

In the first configuration in the transport direction 8, a sheet guiding device 9 is arranged before the printing gap 12.
The sheet guide 9 has a substantially wedge-shaped cross-section, which is formed by a rubber blanket cylinder / plate cylinder 11 and an impression cylinder 10, which extends in a box over the width of the impression cylinder 10. It protrudes in the direction of the wedge-shaped space of the gap 12. According to FIG. 2, the sheet guiding device 9 is divided into three chambers. In this case, the chamber 13 protrudes farthest into the printing gap 12, and the chamber 15 is furthest from the printing gap 12. The chambers 13, 14 are each connected to one or a common pneumatic mechanism for the supply of blowing air and have a plurality of openings 16 in the guide surface 22 (below the sheet guide 9). ing. These openings 16 are inclined in the direction opposite to the conveying direction 8 toward the adjacent impression cylinder 10. Advantageously, the chamber 13 further has at least one opening 16. This opening is in the direction of the printing gap 12 and the rubber blanket cylinder / plate cylinder 1
1, a blowing air stream is blown toward the blanket cylinder / plate cylinder 11 just before the printing gap 12, is deflected at the blanket cylinder / plate cylinder 11 and is directed in the transport direction 8. The printed material on the peripheral surface of the impression cylinder 10 is guided flat and stretched. Of the sheet guiding device 9,
The chamber 15 furthest from the printing gap 12 is the impression cylinder 1
Sheet straightening device 17 assigned to face 0
And is connected to a separate pneumatic mechanism 18. The pneumatic mechanism 18 can be switched selectively for the supply of blowing air for sheet guidance or for the supply of suction air as a sheet straightening device. Optionally, such a pneumatic mechanism 18 is formed exclusively for the suction air supply of the sheet straightening device 17.

The sheet guide device 9 has side frames on both sides.
It is supported by Advantageously, this bearing device is a rotating link
21 and the sheet guiding device 9
It is pivotable about a rotation axis. This will guide the sheet
The device 9 is, for example, a unit area weight or a printed material to be processed.
Can adjust the distance to the impression cylinder 10 according to the printing subject
It is. This spacing forms the introduction gap 19,
Of the sheet guide device 9 can be swiveled.
But always taper in the direction of the print gap 12
It is arranged as follows. From the rooms 13 and 14, the guide surface 22
The blown air flows out of the opening 16 arranged at the bottom. This place
In this case, the kinetic energy of the blowing air acts on the printed matter.
Pressing energy P₁, P₂Is converted to
P₁, P ₂Is the ambient pressure P₀Greater than. in this case,
Pressing energy P₁Represents the pressing energy P in the area of the chamber 13.₂
Is assigned to the area of the chamber 14. In this case, the ambient pressure
Force P₀Press energy P₁Is P₂Equals or equals
Not good. But advantageously P₁> P₂> P₀It is.

The chamber 15 incorporates a sheet straightening device 17, the suction gap of which is provided with a suction strip extending across the paper width in a direction transverse to the transport direction 8 of the printed material. I have. The suction strip is formed from a hole or a slit or a through groove. The sheet straightening device 17 has a wavy contour and is correspondingly arranged adjacent to the impression cylinder 10. This room 15
And the suction strip, negative pressure P _u is supplied by pneumatic mechanism 18. In this case, P ₁ > P ₂ > P ₀ >
_Pu applies.

In another configuration, the sheet straightening device 17 can be closed by a movable means, so that the straightening gap does not work and the pneumatic mechanism 1
8 will not be driven in this case. The movable means closes the straightening gap so that the straightening gap is aligned with the guide surface 22.

In another configuration, the sheet straightening device 17 can be exposed from a closable means, and the pneumatic mechanism 18 is switched to a blowing air supply, whereby the holes or slits in the straightening gap or slits are provided. Blowing air flows out of the groove in the direction of the sheet guiding cylinder or impression cylinder 10. Accordingly, the sheet straightening device 17 is a spraying device.
The kinetic energy of the blowing air flow from the area of the blowing device (switched sheet straightening device 17) acts as pressing energy P3 on the print. In this case, P
_1> is true _{P 2> P 3> P 0} .

In a first configuration, inside a sheet-fed rotary printing press in a row configuration, the sheet guiding device 9 according to the invention, viewed in the transport direction, is behind the reversing mechanism 3, a subsequent printing device or It is arranged before the printing gap 12 of the varnishing device 1 (see FIG. 1). In another configuration, inside a sheet-fed rotary printing press in a row configuration, a sheet guiding device 9 according to the invention is provided in the transport direction 8 with a feed mechanism as a feeding device, for example a suction belt table and The printing gap 12 of the paper feed printing device is located behind the paper feeding device.
It is located in front of.

Optionally, in a relatively simple configuration, the sheet guiding device 9 comprises a sheet straightening device 17 and a guide plate 20 which is fixedly connected. The sheet straightening device 17 is further connected to a pneumatic mechanism and, instead of the above-mentioned chambers 13, 14, follows the sheet straightening device 17 in the transport direction 8 and in the vicinity of the printing gap 12. A protruding guide plate 20 is arranged. The guide plate 20 corresponds to the guide surface 22 in this embodiment, and
The introduction gap 19 is formed together with the peripheral surface of zero.

In a second configuration, a sheet guide 9 having a substantially wedge-shaped cross section is also arranged in the transport direction 8 before the printing gap 12. The sheet guide 9 extends like a box over the width of the impression cylinder 10 and projects in the direction of the printing gap 12. According to FIG. 4, the sheet guiding device 9 is furthest from the printing gap 12 and, at the guiding surface 22, a plurality of rows of spray and suction nozzles 25 connected to the pneumatic mechanism 18.
have. These spray / suction nozzles 25 are arranged at a specified distance from each other and extend at least over a minimum paper width. These spray / suction nozzles 25 extend obliquely in the direction opposite to the printed material conveyance direction 8 to form a negative pressure between the printed material surface and the guide surface 22, and are tangential to the guide surface 22. Is aimed at. In the region of the chamber 15, the compressed air from the pneumatic mechanism 18 is supplied via the conduit mechanism 23 of the chamber 26.
The compressed air flow is split from the chamber 26 to individual blowing and suction nozzles 25 operatively connected to this chamber. In an advantageous embodiment, each insert / suction nozzle 25 is assigned a respective insert 24 which, together with the chamber 15 or the line arrangement 23, is connected to the flow for each spray / suction nozzle 25. Specifies the cross section. These insert members 2
4 is arranged in alignment with the guide surface 22 as a whole.

The sheet guide device 9 having the spraying / suction nozzle 25 further has a guide surface 22 formed in a simple shape as a guide plate 20 reaching the vicinity of the printing gap 12 in the transport direction. I have. Further, the sheet guide device 9
Are chambers 13, 14, 15 that can be loaded in a pneumatic manner
May be provided. In this case, the room 13
In the direction closest to the printing gap 12, the room 1
5 is furthest from the print gap 12. The chamber 15 houses a line arrangement 23 for the supply of compressed air or is itself formed as a line arrangement for the supply of compressed air. In such a configuration, the chamber 15 is
It is directly operatively connected to each spray / suction nozzle 25. The chambers 13 and 14 are provided with the guide surfaces 22 as described above.
Has an opening 16 for blowing air out.

The sheet guiding device 9 arranged before the printing gap 12 is advantageously provided with another sheet guiding device following the printing gap 12 (in the transport direction 8). I have. This other sheet guide device has a printing gap 1
On exiting 2, it serves to guide the printed material in the transport direction 8. The sheet-fed sheet guiding device arranged after this is an impression cylinder 10
Can also be loaded pneumatically with blast air to guide the prints of
And a guide surface that forms an outflow gap that expands in the conveying direction 8 with the outer peripheral surface of the impression cylinder 10.

The mode of operation in the printing press is as follows.

The printed material is delivered from the reversing mechanism 3 to the post-impression cylinder 10 in the transfer area, and the unprinted front surface (the printed back surface is guided on the impression cylinder 10) is post-mounted. Of the printing apparatus 1 in the transport direction 8. After leaving the transfer area in the transport direction 8, the rear area of the sheet-shaped print is lifted from the impression cylinder 10 and, in some cases, tends to flutter. After passing through the sheet guiding device 9, the sheet straightening device 17 draws the print into the straightening gap, which is briefly drawn over the wavy contour, at which time the print is transported. The print is stretched in the opposite direction, while the print is decurled. Immediately thereafter, the openings 16 of the chambers 13, 14 arranged on the guide surface 22
The blown air flowing out of the press presses the printed material onto the impression cylinder 10. In the sheet guiding device 9 provided with the guide plate 20, after the printed material is stretched and the curl is removed, the printed material is guided along the guide plate 20 to just before the printing gap 12. If the sheet guide device 9 is provided with a spray / suction nozzle 25, the printed material is attracted by the negative pressure toward the guide surface 22 and the lower surface of the insert member 24, and is stretched against the transport direction 8. You. Guide plate 2
In the configuration with zeros, the print is subsequently guided to just before the print gap 12. In the configuration having the chambers 13 and 14, the printed matter is pressed onto the impression cylinder 10 by the blowing air flowing out of the opening 16 and the pressing energy of the blowing air.

[Brief description of the drawings]

FIG. 1 shows a sheet-fed rotary printing press provided with a reversing mechanism.

FIG. 2 shows a sheet guiding device provided with a sheet straightening device before a printing gap.

FIG. 3 is a diagram showing another configuration of the sheet guide device.

FIG. 4 shows a sheet guide device having a spraying / suction nozzle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Printing device, 2 Paper discharge device, 3 Reversing mechanism, 4
Conveyance drum, 5 sprocket shaft, 6 chain mechanism, 7 sheet guide device, 8 conveyance direction, 9
Sheet guide device, 10 impression cylinder, 11 rubber blanket cylinder / plate cylinder, 12 printing gap, 13, 14,
15 chambers, 16 openings, 17 sheet straightening device, 18 pneumatic mechanism, 19 introduction gap, 20 guide plate, 21 rotating link, 22
Guide surface, 23 conduit mechanism, 24 insert member, 2
5 spray-suction nozzle, 26 rooms, _{P 1, P} 2, P
₃ Press energy

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Wolfgang Lotzeck Germany Offenbach Betonal-Green-Strasse 9 (72) Inventor Reinhard Luckert Germany Hanau Alter Rückinger Weg 9 (72) Inventor Edgar Dersam Germany Republic of Oberzhausen Ostentstrasse 86

Claims (16)

[Claims] 1. A sheet guiding device for a printing press, comprising a sheet guide cylinder, in a wedge-shaped space in the direction of transport of prints, before a printing gap consisting of a plate cylinder and a sheet guide cylinder. A sheet guide device (9), wherein the sheet guide device (9) is connected to a pneumatic mechanism (18) for supplying air; 17) and a guide surface (22) provided in front of the printing gap (12) in the transport direction (8) of the printed material. (B) The printed material is stretched against the transport direction (8) to curl Characterized in that the sheet straightening device (17) is integrated into the guide surface (22) for taking off.
Sheet guiding device in a printing press. 2. The guide surface (22), together with the adjacent sheet guide cylinder (10), has an inlet gap (1) for printed products.
9. The sheet guide according to claim 1, wherein the guide gap is configured to taper toward the print gap in the direction of transport of the printed product. 8. apparatus. 3. The sheet guide device according to claim 1, wherein the guide surface is a guide plate fixedly connected to the sheet straightening device. 4. A guide surface (22) having a number of openings (16) arranged obliquely and directed against the transport direction (8) of the printed material for blowing air out, the guide surface being provided with a guide surface. At least one chamber (13, 1
3. The sheet guiding device according to claim 1, wherein the sheet guiding device is operatively connected to (4). 5. A sheet guide device (9) comprising a plurality of pneumatically loadable chambers (13, 14) with openings (16) for blowing air outflow. 2. The opening (16) has a pressing energy (P ₁ , P ₂ ) acting evenly or unequally on the printed matter in the transport direction (8) of the printed matter and before the printing gap (12). Or the sheet guide device according to 2 or 4. 6. The sheet straightening device (17) has at least one straightening gap, which is interrupted by a pneumatic mechanism (18) inside the guide surface (22). 3. The sheet guiding device according to claim 1, wherein the sheet guiding device can be closed when the sheet guiding device is closed. 7. A pneumatic mechanism connected to the sheet straightening device (17) can switch to a blowing air supply in order to direct a blowing air flow to an adjacent outer peripheral surface of the sheet guiding cylinder. 3. A sheet guiding device according to claim 1, wherein the guiding device is capable of being used. 8. A sheet guiding device (9) corresponding to a printing gap (12) of a printing device or a varnishing device (1) downstream of a reversing mechanism (3) in the transport direction (8). 2. The sheet guiding device according to claim 1, wherein the sheet guiding device is provided. 9. A sheet guiding device (9) is arranged corresponding to a printing gap (12) of a printing device or a varnishing device (1) downstream of a paper feed mechanism in a transport direction (8). The sheet guiding device according to claim 1, wherein: 10. Pneumatically loadable at least one pneumatically mounted rear surface behind a printing gap (12).
A sheet guiding device having two chambers is arranged, the opening for the blowing air outflow of the device being directed in the direction opposite to the conveying direction (8) to the sheet guiding cylinder (10). ing,
The sheet guide device according to claim 1. 11. A sheet guide device for a printing press, comprising a sheet guide cylinder, in a wedge-shaped space in the direction of transport of printed products, before a printing gap consisting of a plate cylinder and a sheet guide cylinder. A plurality of spray and suction nozzles, in which the sheet guide device (9) is operatively connected to a pneumatic mechanism (18) for supplying air. (25) and a guide surface (22) in front of the printing gap (12) in the printed material transport direction (8). (B) The spray / suction nozzle (25) guides the printed material. It is oriented tangentially to the guide surface (22) obliquely to the transport direction (8) in order to be attracted to the surface (22) and stretched in the direction opposite to the transport direction (8). A sheet guide device for a printing press, characterized in that: 12. A pneumatic mechanism (18) is connected to the pipeline mechanism (23) and the chamber (26), from which compressed air flows from each of the blowing / suction nozzles (2).
12. The sheet guiding device according to claim 11, which is divisible into 5). 13. The pneumatic mechanism (18) comprises a chamber (1).
12. The sheet guiding device according to claim 11, which is operatively connected to the at least one air-flow device, wherein the compressed air flow is splittable from the chamber into the respective spraying and suction nozzles. 14. An insert member (24) is assigned to each spraying / suction nozzle (25) so that the insert member (24) is aligned with the guide surface (22). 14. The sheet guiding device according to claim 11, wherein the sheet guiding device is arranged. 15. The sheet guiding device according to claim 11, wherein the guide surface is a guide plate fixedly connected to the spray and suction nozzle. 16. The guide surface (22) has a number of openings (16) which are obliquely arranged and are directed against the printed material transport direction (8) for blowing air outflow, At least one chamber (1
12. The sheet guiding device according to claim 11, which is operatively connected to (3, 14).