JPH11221904A - Sheet paper guiding device in printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly guide sheet papers along a guide face and to remarkably decrease damage of an article to be printed in the region of the back edge part of a sheet paper in a style wherein a flat paper guiding device provides a guide face and it belongs to and is arranged in a delivering region of two hooking nail devices. SOLUTION: A comb-like mounting member 24 is arranged on a sheet paper guiding device 11 between the guide face 22 of the sheet paper guiding device 11 and a delivering region 10 and has a plurality of teeth 17 and a guide face 16 and the guide face is in the same line as the guide face of the sheet paper guiding device and is curved in the same direction and the above described teeth are arranged at intervals for forming gaps each other.

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 in a printing press, wherein the sheet guiding device has a guide surface and is arranged in a transfer area of two gripper devices. Format

[0002]

2. Description of the Related Art Such a sheet-guiding device is known from EP-A-0156173. In this case, the sheet guide device is formed by a plurality of air supply boxes (called flow paths) that are assembled with modules and provided with a unified guide surface and connected to a fan. The air supply box (Luftversorgungskasten) has, as an air nozzle, an opening in the guide surface which can be loaded with suction air or blown air by a fan. further,
Such an air supply box is formed with a comb-like end on the end side. The disadvantages here are the high production costs and the fact that this comb-like configuration does not take into account the sheet properties of different substrates. In addition, replacement of the air supply box with the comb configuration is expensive.

[0003]

SUMMARY OF THE INVENTION The object of the invention is to improve a sheet guide device of the type mentioned at the outset, in order to avoid the above-mentioned drawbacks, and in particular to provide a uniform sheet along the guide surface. The aim is to enable guidance and to significantly reduce damage to the substrate, especially in the area of the trailing edge of the sheet.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a comb-like mounting member is provided between a guide surface of a sheet guide device and a transfer area. The mounting member has a guide surface, the guide surface is in the same row as the guide surface of the sheet guide device and is curved in the same direction, and the mounting member is It has a plurality of teeth arranged on the strip, which teeth are spaced apart from one another to ensure the passage of at least one gripper device. Advantageous configurations of the invention are set out in the dependent claims.

[0005]

The advantage of the sheet guiding device according to the invention is that the mounting member is pushed as close as possible to the transfer area (so as not to cause damage in the section of the sheet trailing edge). Is to be. The gripper device can be arranged on the sheet guide cylinder and / or on the circulating chain mechanism. According to the configuration of the invention, the mounting member has a doctor function for the adjacent sheet guiding cylinder. Furthermore, since the mounting member is detachably connected to the stationary sheet guide device, the mounting member can also be retrofitted to existing sheet guide devices (eg, EP 0156173B1). The replacement of the air supply box as described above is omitted. Furthermore, the mounting elements can be easily exchanged and can therefore be adapted to the weight to be printed, for example in the number or shape of the teeth, depending on the substrate to be processed, and thus the sheet course. Another advantage resides in that at least the teeth have a continuous curve, at least towards the substrate. This avoids tearing in the section of the trailing edge of the sheet.

The solution of the present invention is not limited to the configuration of the embodiment described below. Rather, the solution according to the invention is also suitable for the use of other areas in the printing press. For example, the mounting member is arranged in the transport direction of the sheet guiding device in the transport direction in front of the transfer area of the two gripper devices.

In another embodiment, the mounting member is arranged above the sheet-guiding cylinder behind the transfer area and is oriented in the direction opposite to the transport direction.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

The sheet-fed rotary printing press shown in FIG. 1 comprises, in an embodiment, a plurality of printing units 1 and a varnishing unit 8.
These are arranged in series in the transport direction 12. Behind the varnish pulling unit 8 in the transport direction 12, a paper discharge device 9 having a circulating chain mechanism 14 is arranged. And drop it there. Each printing unit 1 comprises a plate cylinder 2, a rubber blanket cylinder 3, and a sheet guiding cylinder 4, here an impression cylinder. Each plate cylinder 2
Is associated with an inking unit and, if appropriate, a dampening unit. The varnishing unit 8 is a metering device 7, for example, a chamber doctor with a meshing roller.
(Kammerrakel). The metering device 7 is in operative connection with the plate cylinder 6. On the plate cylinder 6,
Furthermore, a sheet-guiding cylinder 4, here an impression cylinder, is assigned to it.

Between the printing unit 1 and the varnishing unit 8 there is arranged a sheet-guiding cylinder 5, here formed as a transfer cylinder. The sheet guide cylinders 4 and 5 and the chain mechanism 14 are provided with a gripper device (G
reifersystem) 13. A sheet guiding device 11 is arranged adjacent to the sheet guiding cylinder 5 and the chain mechanism 14, preferably in a modular configuration.

In the transfer area (Uebergabebereich) 10, as is well known, sheets are transferred from a first gripper device to a second gripper device.

FIG. 2 shows the transfer area 10 between the two sheet-guiding cylinders 4,5. In this case, the transport direction 12
The sheet guide device 11 is arranged in the sheet descending path. The sheet guide device 11 has a guide surface 22.
The guide surface 22 has an opening 23 for outflow of blast air or inflow of suction air. On the end side of the guide surface 22, between the sheet guide device 22 and the transfer area 10, a comb-like mounting element 24 is preferably removably arranged. The mounting member 24 has reached the vicinity of the delivery area 10. The mounting member 24 of the present invention has a guide surface 16. The guide surface 16 is arranged in the same row as the guide surface 22 and in the same bending direction. Furthermore, the mounting member 24 has a plurality of teeth 17 arranged on the strip 19 over the width of the sheet guide cylinders 4,5. Tooth 1
7 are at least one gripper device 1 which is arranged at a predetermined distance from one another and therefore does not guide the sheets.
3 form a gap 18 passed through.

As shown in FIG. 2 or FIG.
Is detachably secured to the sheet guide device 11 by a coupling means 20, for example a screw connection. In an advantageous configuration, at least the teeth 17 are continuously curved sections 21
have. The bend 21 may extend on the side of the strip 19 facing the tooth 17. In this case, the bend 21 preferably has a radius of 1.0 to 5.0 mm.

The mode of operation is as follows: In the transfer area 10, the sheet is fed from the rotating sheet guiding cylinder (press cylinder) 4 in the transport direction 12 at the leading edge in the rotating sheet guiding cylinder. (Transfer cylinder) Delivered to 5. In this case, the sheet is attached to the outer surface of the sheet guiding cylinder 4 at a part of the sheet behind the transfer area 10. A comb-shaped mounting element 17 protrudes in the vicinity of the transfer area 10 and strips the remaining sheets from the mantle surface of the sheet guiding cylinder 4 (abschaelen). The sheet is guided substantially on a sheet transport surface 15 shown in FIG. 2 and slides in the sheet transport surface 15 along guide surfaces 16, 22.

By peeling off the sheet guide cylinder 4 and, preferably, in combination with the bend 21, damage to the sheet is avoided and the sheet is guided uniformly.

In the case of processing a printing material having a weight per unit area different from the previously processed printing material, if necessary, a comb-like mounting member 24 may be mounted, for example, on another mounting member having a curved portion 21 having a different radius. It is replaceable with the member 24. Optionally,
The mounting member 24 may be arranged immovably on the sheet guiding device 11.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a tandem-type sheet-fed rotary printing press.

FIG. 2 is a schematic view of a sheet guide device in a transfer area.

FIG. 3 is a detailed view of a sheet guide device.

[Explanation of symbols]

1 printing unit, 2 plate cylinder, 3 rubber blanket cylinder, 4,5 sheet guide cylinder, 6 plate cylinder,
7 metering device, 8 varnishing unit, 9
Paper discharge device, 10 delivery area, 11 sheet guide device, 12 transport device, 13 gripper device,
14 chain mechanism, 15 sheet transport surface,
16 guide surface, 17 teeth, 18 gap, 1
9 strips, 20 connecting means, 21 curved part,
22 guide surface, 23 opening, 24 mounting member

Claims (7)

[Claims] 1. A sheet guide device in a printing press, wherein the sheet guide device has a guide surface and is arranged in a transfer area of two gripper devices. A comb-like mounting member (24) is arranged on the sheet guide device (11) between the guide surface (22) of the sheet guide device (11) and the transfer area (10); A mounting member (24) having a guide surface (16);
A plurality of teeth, the guide surface being in the same row as the guide surface (22) of the sheet guide device and curved in the same direction, and the mounting member (24) being arranged on a strip (19); (1
7), wherein the teeth (17) are spaced from each other (1).
8) Sheet guiding device in a printing press, characterized in that they are arranged at intervals forming 8) and guarantee the passage of at least one gripper device (13). 2. The sheet guiding device according to claim 1, wherein at least one of the teeth has a continuous curved portion. 3. The curved portion (21) has a length of 1.0 to 5.0 m.
3. The sheet guiding device according to claim 2, which has a radius of m. 4. The sheet guide as claimed in claim 1, wherein the mounting member is arranged in a sheet descending path behind a transfer area as viewed in the transport direction. apparatus. 5. The sheet guide according to claim 1, wherein the mounting member is arranged in the sheet-lifting path in front of a transfer area as viewed in the transport direction. apparatus. 6. The mounting member (24) is arranged above a sheet-guiding cylinder (4, 5) in a direction opposite to the conveying direction (12) and behind a transfer area (10). Or the sheet guide device according to 2. 7. The sheet guide device (1), wherein the mounting member (24) is provided.
2. The sheet guiding device according to claim 1, wherein the sheet guiding device is detachably disposed in 1).