EP0909648B1 - Device for cleaning cylinders of a printing press - Google Patents

Abstract

The rotational axis of the motor(5)-driven washing-roll (4) is parallel with that of the first cylinder (1) being cleaned. The washing roll's periphery (13) is at a first angle with the first cylinder, and at a second angle wit the adjacent second cylinder (2). Spray-jets (6,7) spray the cleaning fluids (8,9) on the washing roll which has a scraper (10). The motor s coaxial with the washing roll or beside the rotational axis of the washing roll.

Description

The invention relates to a device for cleaning cylinders Printing machine according to the preamble of claim 1.

Printing machines, such as newspaper web printing machines, commercial web printing machines and sheetfed presses contain a variety of cylinders, especially blanket cylinders, impression cylinders, plate and Forme cylinders, cooling rolls, guide rolls, inking rolls and dampening rolls. For guidance, Processing and driving the printing material sheets or printing material webs is an intensive contact between the substrates and the cylinders necessary. This creates deposits of paper dust on the cylinders and printing ink.

Deposits result in particular with blanket cylinders in offset printing in a loss of sharpness; some print lots may print with existing impurities no longer properly. Especially with blanket cylinders However, the deposition rate is due to the high viscosity and Adhesion of the printing ink is particularly high.

To remove deposits and contamination on cylinders from Printing machines are, in addition to the wash of Manual, automated cleaning equipment used:

DE 297 00 662 U1 describes a cleaning device which is connected to a to be cleaned cylinder of a printing unit is adjustable and a driven Washing roller includes, the axis of rotation of which is parallel to the axis of rotation cleaning cylinder and the circumferential surface of which has an angular range, which is intended for contact with the cylinder. The washing roller is sprayed with detergents via a detergent supply device. To wipe off the contaminants lifted off the cylinder is one Squeegee provided.

Such a cleaning device can also be found in EP 0 659 560 B1.

The known automated cleaning devices for cylinders of printing machines are usually permanently assigned to one cylinder, whereby they can be employed for the cleaning process. The rotating one Wash roller is moistened with cleaning liquids, so that the most Cylinder impurities are softened and lifted off. The dirt picked up by the washing roller is removed by the scraper continuously eliminated.

In practice, there is often the problem that two cylinders to be cleaned are so narrow are arranged adjacent that the room can hardly be installed by two separate Cleaning facilities are sufficient. Especially in H printing units from The two pairs of blanket cylinders are often only approx. 80 mm apart one above the other. Lie above and below Printing plate cylinder on the blanket cylinders, so that the space for Attach two cleaning devices on the accessible front of the Blanket cylinder pairs is very limited. In addition, when changing the printing plate additional space is required: the pressure plates are in the direction of travel of the printing plate cylinder inserted by placing it with its front edge in a Driving groove of the printing plate cylinder inserted and rotating the Printing plate cylinders are placed on this. Here, the printing plates can be bent concave only to a limited extent, so that the immediate space in front of the associated blanket cylinder when changing the printing plate is required by the pressure plate.

A device is known from EP 0 770 483 A2, which comprises a washing roller, the circumferential surface of which has two angular ranges separated from one another, each for contact with one of the two cylinders to be cleaned is provided. Such a device is also known from FR 1 351 365. These prior art devices mitigate the above Problem without completely solving it: the motor for driving the washing roller, which is not shown in EP 0 770 483 A2, requires a not inconsiderable additional installation space. To change the printing plate In H-printing units of offset printing machines, for example, is not to be impeded the construction known from FR 1 351 365 is necessary - the motor is not in the immediate vicinity of the washing roller to be driven arranged, but at a considerable distance, the power transmission by means of Drive pulleys and drive belts are made.

The invention is therefore based on the object of a device for cleaning of cylinders of a printing press according to the preamble of claim 1 to improve so that the installation space required for this device considerably is reduced.

This object is achieved by a device having the features of claim 1 solved.

Advantageous refinements and developments of the invention result from claims 2 to 11.,

The device according to the invention is thus designed such that the washing roller essentially in the space between the two to be cleaned Cylinders, with the motor either coaxial with the washing roller or upstream, So in the direction of the connecting plane of the axes of rotation of the two cylinders next to the Axis of rotation of the washing roller in the nip is arranged between the two cylinders to be cleaned. The example space required for a printing plate change and blanket change the cylinders remain completely free.

Due to the invention, it is possible to clean the two cylinders can be cleaned alternately by a very small swiveling movement of the washing roller; but preferably the washing roller can also be used for the cleaning process be turned on the cylinders so that they are simultaneously with both cylinders comes into contact and cleans both cylinders simultaneously. It is on the Hand that in particular the latter alternative a particularly quick cleaning the cylinder allows.

According to the invention for the positioning movement and / or the pendulum movement the mechanics required for the washing roller can be accommodated in the smallest space be, so that the device according to the invention is practically completely in the gap between two adjacent cylinders and the space in front of these cylinders remains free.

Around the one picked up by the washing roller and on the scraper It is to be able to catch and discharge tangentially thrown off dirt it is important that the device according to the invention be provided with a collecting trough is.

It is advantageous here if the drip pan has a special shape the finger guard that is normally present anyway for occupational safety reasons is formed. Such a finger guard is preferably on attached the device according to the invention that it is the adjusting movement and / or the pendulum movement of the washing roller does not participate, but essentially remains stationary.

The use of the device according to the invention is particularly advantageous for Clean two rubber blanket cylinders one above the other H printing unit of an offset printing machine.

To achieve an optimal cleaning result, it is advantageous if the Washer roller is designed as a brush roller. The applicant achieved with brush rollers in state-of-the-art automated cleaning equipment very good cleaning results for some time. Alternatively, you can but also a washing roller with a fixed or replaceable washing surface, such as a washcloth.

Since, for reasons of space, usually only a single stripping device for the Washer roller is provided, it should be arranged above the washing roller be, seen in the direction of rotation of the washing roller, behind the apex The same: The dirt picked up by the washing roller then becomes flung down on the side facing away from the cylinders.

To optimize the cleaning result, in front of both angular ranges, where the cylinders are cleaned, each with separate cleaning fluids be fed. Among cleaning liquids are, for example Oils, organic solvents, but also water and cleaning emulsions to understand.

Finally, a housing is expediently provided, in which the washing roller is arranged and which each has a separate opening for the first and has the second angular range of the peripheral surface of the washing roller. In the Usually, these two openings are on two opposite sides of the Housing be arranged. If the two cylinders to be cleaned are one above the other the lower cylinder is in contact with the bottom the wash roller, and the top cylinder by contacting the top the washing roller cleaned, which was previously not considered possible.

Figur 1

eine schematische Schnittdarstellung einer in eine Druckmaschine eingebauten erfindungsgemäßen Vorrichtung;

Figur 2

eine schematische Darstellung einer H-Druckeinheit mit zwei eingebauten erfindungsgemäßen Vorrichtungen;

Figur 3

eine der Figur 1 entsprechende Darstellung eines anderen Ausführungsbeispiels einer erfindungsgemäßen Vorrichtung.

Two exemplary embodiments of the invention are described in more detail below with reference to the drawings. Show it:

Figure 1

is a schematic sectional view of an inventive device installed in a printing press;

Figure 2

a schematic representation of an H-printing unit with two built-in devices according to the invention;

Figure 3

a representation corresponding to Figure 1 of another embodiment of a device according to the invention.

In Figure 1, which shows a device according to the invention in a schematic Shows a sectional view, a first cylinder 1 and a second cylinder 2 are indicated, which are arranged close to each other. In between a washing roller 4, which is driven by a motor 5 is driven by a gear or belt, not shown. Instead of of a housing 3, only one frame can also be provided.

Spray tubes 6 and 7 are arranged inside the housing 3, through which Cleaning fluids 8 and 9 are applied to the washing roller 4. Finally, there is a stripping device 10 for the washing roller in the housing 3 4 provided.

A finger guard 11 attached to increase occupational safety sets down in a sump 12 for the detached from the cylinders 1 and 2 and thrown off the washing roller 4 at the stripping device 10 Dirt away.

The washing roller 4 is arranged so that its axis of rotation is parallel to the axes of rotation the cylinder 1 and 2 is. Points below its axis of rotation the peripheral surface 13 of the washing roller 4 has a first angular range ϕ in which it protrudes through an opening in the housing 3. With a (not shown) Mechanics can the housing 3 with the washing roller 4 at the first Cylinder 1 are employed that the peripheral surface 13 of the washing roller 4 in the first Angular range ϕ maintains contact with the first cylinder 1 and cleans it. At the same time, the peripheral surface 13 points above the axis of rotation of the Washer roller 4 on a second angular range, in which the peripheral surface 13 through a second opening of the housing 3, which is opposite the first opening, protrudes beyond the housing 3 and for cleaning the second cylinder 2 can come into contact with it.

The device can be adjusted by a small linear movement of the housing 3 left, which the finger guard 11 does not participate in, at the same time the first cylinder 1 and the second cylinder 2 are turned on, whereby a The two cylinders 1 and 2 are cleaned simultaneously: the washing roller 4 preferably rotates clockwise during the cleaning process, so that initially in the first angular range ϕ deposits and contamination be loosened and lifted off on the first cylinder 1. Then in the second Angular range ψ the second cylinder 2 cleaned. Here, the spray tubes wet 6 and 7, the washing roller 4 with cleaning liquids 8 and 9, for example with water and a hydrocarbon.

The dirt picked up by the washing roller 4 from the first cylinder 1 and the second cylinder 2 is then stripped on the stripping device 10 and splashes tangentially away from the peripheral surface 13 of the washing roller 4; he will collected in the drip pan 12 and derived from there. After completion of the cleaning process, the housing 3 is returned to that shown in FIG Rested position.

As an alternative to the simultaneous cleaning of the two cylinders 1 and 2, this can be done in FIG 1 shown housing 3 perform a slight pendulum movement, so that the peripheral surface 13 of the washing roller 4 alternately in contact with the first Cylinder 1 or the second cylinder 2 comes. The finger guard remains 11 with the sump 12 also stationary.

Figure 2 shows the installation situation of two devices according to the invention Washing rollers 4, 4 'and finger guards 11, 11' in an H printing unit 14 an offset printing machine. By means of this H printing unit 14, a printing material web is formed 15 passed and from two first blanket cylinders 16 and 16 'and printed by two second blanket cylinders 17 and 17'. The Blanket cylinders 16, 16 ', 17, 17' are first printing plate cylinders 18 and 18 'and second printing plate cylinders 19 and 19' assigned.

Figure 2 illustrates the cramped space in an H-printing unit 14, especially if you keep in mind that the printing plate cylinders 18, 18 ', 19, 19' need to be fitted with new printing plates from time to time, what considerable space in the area of the adjacent blanket cylinder 16, 16 ', 17, 17' claimed. The washing rollers 4 are in the space between the first blanket cylinder 16 and the second blanket cylinder 17 or the first blanket cylinder 16 'and the second blanket cylinder 17 'and only protrude with their finger guards 11 from the outside accessible space of the H printing unit 14.

FIG. 3 shows a second exemplary embodiment, corresponding to the representation in FIG. 1 of the invention: The washing roller 4 is in turn in a housing 3 arranged, in which there are also two spray tubes 6 and 7 and one Scraper device 10 are. The motor 5 for driving the washing roller 4 is However, this is not upstream, but arranged coaxially with it. How immediate from Figure 3, the installation space is necessary for this device is again reduced compared to the exemplary embodiment according to FIG. 1 been.

With the embodiment shown in Figure 3, two cylinders can simultaneously can be washed, the installation space required for this even smaller than that for a single cleaning device according to the prior art.

Compilation of the reference symbols

1

Cylinder (first)

2nd

Cylinder (second)

3rd

casing

4, 4 '

Wash roller

5

engine

6

Spray tube

7

Spray tube

8th

Cleaning fluid

9

Cleaning fluid

10th

Scraper

11, 11 '

Finger mudguard

12th

Drip pan

13

Peripheral area (of 4)

14

H printing unit

15

Substrate web

16, 16 '

Blanket cylinder (first)

17, 17 '

Blanket cylinder (second)

18, 18 '

Printing plate cylinder (first)

19, 19 '

Printing plate cylinder (second)

ϕ

Angular range (first)

ψ

Angular range (second)

Claims (11)

1. Device for cleaning cylinders of a printing press,

   with a driven wash roll (4), the rotational axis of which is parallel to the rotational axis of a first cylinder (1) to be cleaned and the circumferential surface (13) of which comprises a first angular range () which is provided for contact with the first cylinder (1), and a second angular range (ψ) which is offset from the first angular range () and is provided for contact with a second cylinder (2) adjacent to the first cylinder (1),

   with a motor (5) for driving the wash roll (4),

   with means (6, 7) for spraying the wash roll (4) with cleaning liquids (8, 9) and

   with a scraping appliance (10) for the wash roll (4),
   characterised in

   that the rotational axis of the wash roll (4) lies between the common tangent plane of the lateral surfaces of the two cylinders (1, 2) and the connecting plane of the rotational axes of the two cylinders (1, 2),

   and that the motor (5) is disposed coaxially with the wash roll (4) or, in the direction of the connecting plane of the rotational axes of the two cylinders (1, 2), next to the rotational axis of the wash roll (4).
2. Device according to claim 1, characterised in that the device comprises a collecting trough (12).
3. Device according to claim 2, characterised in that the collecting trough (12) is formed by a specially shaped finger guard plate (11).
4. Device according to any one of claims 1 to 3, characterised in that the wash roll (4) is disposed such that it is simultaneously in contact with the first cylinder (1) and the second cylinder (2) during the cleaning operation.
5. Device according to any one of claims 1 to 3, characterised in that an adjusting mechanism is associated with the wash roll (4), which mechanism brings the wash roll (4) into contact with either the first cylinder (1) or the second cylinder (2) during the cleaning operation.
6. Device according to any one of claims 1 to 5, characterised in that the first cylinder (1) and the second cylinder (2) are two blanket cylinders (16, 16', 17, 17') in a H-pressure unit (14) of an offset printing press.
7. Device according to any one of claims 1 to 6, characterised in that the wash roll (4) is a brush roll.
8. Device according to any one of claims 1 to 6, characterised in that the wash roll (4) is provided with a permanent or a replaceable wash covering.
9. Device according to any one of claims 1 to 8, characterised in that the scraping appliance (10) is disposed above the rotational axis of the wash roll (4).
10. Device according to any one of claims 1 to 9, characterised in that a separate means (6, 7) for spraying cleaning liquid is in each case associated with the first angular range () and the second angular range (ψ).
11. Device according to any one of claims 1 to 10, characterised in that the wash roll (4) is disposed in a housing (3) which is provided with a respective separate opening for the first and the second angular range (,ψ) of the circumferential surface (13) of the wash roll (4).

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