JPH07112524A - Rotary press and ink profile setting method - Google Patents

Abstract

PURPOSE: To easily and quickly perform the replacement of an ink profile, reduce broke, and set a state being suitable for a real printing as quickly as possible at the time of a trial printing. CONSTITUTION: An ink device 1 has an ink jug 3, and during an operation, an ink feeding roller 4 meters and takes out an ink from the ink jug 3. An ink transfer roller 5 works while associating with the ink feeding roller and a laterally swinging roller. A wetting device 2 has a wetting water container 26, and one part of a base roller 28 is dipped in a wetting water 27. The base roller 28 works while associating with a metering roller 29. A rubber roller 30 is provided, and the ink device 1 and the wetting device 2 have laterally swinging rollers 7, 8, 9 and 10 equipped with a driving device. Six rider rollers/ transfer rollers 11-16, and nine rubber rollers 17-25 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary printing machine, in particular an offset printing machine, in which a printing machine has a plate and a dampening machine and an inking machine with which a constant ink profile is set.

[0002]

2. Description of the Related Art In a printing machine of the type described above, it is necessary to make an ink profile corresponding to a pattern in an inking device for final printing. If the ink profile suitable for the final print is not yet available at the start of printing, after the trial printing, a large amount of loss is required before the required ink profile, and thus a stable ink-fountain solution equilibrium is set. Paper is generated. Therefore, in order to eliminate or substantially reduce spoilage, it is necessary to have an appropriate ink profile already at the start of printing. This is first of all necessary if a new version of the design is used, which is far from the case of conventional print jobs. Furthermore, in order to reduce wasted paper, even after a long interruption of printing (that is, when re-introducing an already used plate), the required ink profile must be Should be set in.

From German Patent Application Publication 3800570, a printing device for a rotary printing press is known.
The printing apparatus has at least two ink cylinders, for example, a plate cylinder and a blanket cylinder. At least one of the cylinders to which ink is applied is provided with an ink reduction device that can be pressed or released to set a state suitable for the final printing. This ink reduction device takes over the function of the material to be printed. That is, the film of the ink and the dampening water supplied from the inking device and the dampening device are transferred to the cylinder on which the ink is applied corresponding to the pattern, and are taken in by the ink reducing device from there. According to this, it is possible to set the ink profile required for the final printing without requiring printing on the printing medium. Thereby, waste paper can be largely avoided.

Furthermore, when switching between print jobs, that is, when introducing a new plate with a different pattern from the previous plate, the inking unit is first used to remove the ink for the previous printing ink profile. It is known to clean so that it is eliminated by. Removing all the ink volume from the inking unit, especially by scraping and subsequent washing, is very cumbersome and therefore takes a long time. Furthermore, the ink profile must be renewed from the ground state in the inking unit for subsequent printing to begin. That is, first the proper amount of ink must be put.

[0005]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to allow for quick replacement of ink profiles in a simple manner, thus reducing the preparation time when switching print jobs. To provide different types of rotary printing machines. In addition, the proof should be ready for production as quickly as possible so that spoilage is largely avoided.

[0006]

The object of the invention is, according to the invention, to eliminate the previous ink profile in the inking unit and to carry out a full inking of the plate in preparation for the production of a new ink profile. Will be resolved.

[0007]

As a result, the previously existing ink profile is destroyed and made uniform. If the plate is fully inked, the corresponding ink distribution will be established throughout the inking unit. That is, there is a uniform ink distribution over the length of the ink roller. This is a good precondition for creating a new ink profile on subsequent "printing jobs" on top of the "base ink layer" so produced. As a result, the total amount of ink is not removed from the inking device, so that the preparation time at the time of switching jobs is greatly shortened. Furthermore, a new ink profile can be produced on the homogenized basic inking layer substantially more rapidly than in the case of a washed and deinked inking unit.

During full surface inking of the plate according to the invention, the ink profile settings of the metering elements in the ink fountain area of the inking unit may remain at the old preset and the You may already have new presets there. Alternatively, it may also be desirable to have a neutral setting there. If the ink profile has already been preset for the new print job during plate inking, the faster it is possible to achieve the ink profile formation corresponding to the pattern corresponding to the actual printing condition, and thus the loss. Paper is largely avoided.

For full plate inking, it is desirable to control the dampening device so that the plate receives little or no dampening water. Due to the lack or insufficient quantity of dampening water, the areas of the plate that were originally not ink-printed at the time of main printing will also receive ink, thereby providing a state of complete ink-transfer according to the present invention. Is established.

The supply of dampening water can be prevented by one or more dampening water rollers of the dampening device occupying a position remote from the plate during inking of the plate.
If the dampening device and the inking device are connected to each other by an intermediate roller, the intermediate roller is dampened so that the dampening water does not reach the inking device through the intermediate roller and from there to the plate. It must be moved away from the drip and / or inking unit.

In order to remove the ink again from the fully inked plate, there is provided a rubber cloth cleaning device belonging to the blanket cylinder, which cleans the plate under the condition that the blanket cylinder is pressed against the plate. To wash. That is, in the rubber cloth cleaning device, not only the rubber cloth is cleaned but also the cleaning liquid is supplied to the plate because the rubber cylinder is pressed against the plate, that is, the plate to which the plate cylinder is attached. Due to the structure of the machine, it is not possible to set the contact between the blanket cylinder and the plate cylinder, and the impression cylinder that carries the material to be printed (for example, paper) may cause the cleaning liquid to reach it. If you have to rely on being able to approach the blanket cylinder, between the impression cylinder and the blanket cylinder,
It is desirable that the pressure adjusting means, which is provided for balancing the thickness of the paper itself, can be set so that a sufficient distance can be secured so that the cleaning liquid can be prevented from being transmitted.

In order that the equalized ink profile produced in the inking unit is not destroyed by the cleaning liquid,
There must be a separation between the plate and the inking unit during cleaning. The inking unit preferably has at least one inking roller which works in combination with the plate.
Therefore, during cleaning, the inking roller must be moved away from the plate.

The present invention still relates to a method for newly setting the ink profile of an inking unit of a rotary printing press, especially an offset printing press, which has a plate, in order to carry out a new printing job. The present invention relates to a method of inking the entire surface of a plate in order to break / uniformize a conventional ink profile in an inking device.

The plate can be washed after breaking / uniformizing the previous ink profile. This washing process can take place in the printing press, in which case the inking unit must occupy a position remote from the plate so that the washing liquid cannot be transmitted. Particularly, the cleaning process is performed by a rubber cloth cleaning device. For this purpose, the rubber cloth occupies a position which is pressed against a plate, which is designed as a printing plate (aluminum printing plate) attached to the plate cylinder.

[0015]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows a roller diagram of an offset printing machine not shown in detail. This roller diagram has an inking device 1 and a dampening device 2.
The inking device 1 has an ink fountain 3, which has a metering element (not shown) for setting an ink gap for each zone. 4 dispenses ink from the ink fountain 3. The ink transfer roller 5 works in combination with the inking roller 4 and the driven oscillating roller 6. The dampening device 2 has a dampening water container 26 filled with dampening water 27, and a main roller 28 is immersed in the dampening water 27 at a part of its periphery. The original roller 28 is a metering roller 29
Work in union with. Further, a rubber roller 30 is provided. The inking unit 1 and the dampening unit 2 also have lateral swing rollers 7, 8, 9, 10 with a drive mechanism. In addition, six rider rollers / transfers (Ubertragung
s) Rollers 11 to 16 and nine rubber rollers 17 to 25 are provided. In some cases, the inking unit 1 and the dampening unit 2 are connected to each other by one intermediate roller (not shown).

With the roller arrangement described above, the plate 32 is supplied with ink and dampening water 27. The plate 32 is a printing plate (not shown) attached to the plate cylinder 33. The transfer of the ink and dampening water 27 from the inking device 1 and the dampening device 2 to the printing plate is performed by the rubber rollers 18, 20, 25.
And 30. These rollers are therefore referred to as inking rollers 34, and the roller 30 which transports dampening water is referred to as dampening roller 35.

A control device (not shown) moves the inking roller 34 and the fountain solution roller 35 both to a position where they come into contact with the plate 32 and a position where they come away therefrom. In the state shown in FIG. 1, the inking roller 34 occupies the pressing position and the dampening water applying roller 35 occupies the separated position.

It is assumed that the print job executed by the plate 32 attached to the plate cylinder 33 is completed, that is, a desired number of copies are printed. At that time, jobs must be switched. In other words, new printing must be performed by printing plates having different patterns.

In order to be able to set the ink profile in the inking unit according to the final printing state of the new printing process as quickly as possible, according to the invention, first the plate 3 is used.
2. That is, the entire surface of the plate stretched on the plate cylinder 33 which has been conventionally used is inked. This places the dampening fountain roller 35 away from the plate cylinder 33 and eliminates the coupling between the dampening device 2 and the inking device 1 (remove the intermediate roller if one is used). This is preferably achieved by preventing the dampening water 27 from coming to the plate 32 by moving it to the position). As a result, the area of the plate 32 where the ink is not originally applied in the final printing state receives the ink (floating and smeared state).
The printing of the entire surface of the plate 32 affects the ink profile of the inking device 1. There, the previous ink profile produced in the print job performed is destroyed, in particular homogenized. This becomes the basic "basic ink layer thickness" for the formation of new ink profiles for subsequent print jobs.

Before the new plate 32 is applied to the plate cylinder 33, the old inked plate must first be washed. Therefore, as shown in FIG. 2, the inking roller 34 is moved to a position away from the plate 32. The dampening water application roller 35 remains at a position where it does not contact the plate cylinder 33. In the offset printing machine, the blanket cylinder 36, which is always present,
It is in a position to press against the plate cylinder 33. A rubber cloth cleaning device 37 is attached to the blanket cylinder 36. This device has two cleaning rollers 38 rolling on the outer peripheral surface of the blanket cylinder 36, and a common roller 39 connecting the cleaning rollers 38. Furthermore, a transfer roller 40, which is in contact with the upper cleaning roller 38, is provided, to which the cleaning liquid is supplied by the spray device 41. A doctor device 42 is attached to the roller 39, and a saucer 43 is arranged below the doctor device 42. Cleaning position (second
In the drawing, the cleaning liquid supplied from the spray device passes through the transfer roller 40 and the cleaning roller 38, and the blanket cylinder 36.
Transferred to the upper rubber cloth. The blanket cylinder 36 then transfers a portion of the cleaning liquid to the plate cylinder 33 and thus to the plate 32. As a result, the ink layer forming the entire surface ink is dissolved and removed. In this way, the ink residues and the like reach the roller 39, where they are scraped off by the doctor device 42.

Once the previously used plate has been cleaned, it is removed from the offset printing press. The plate used for the new print job can then be applied onto the plate cylinder 33.

In order to homogenize the conventional ink profile of the inking unit and also to create the new ink profile required for a new print job, plate 3
During the whole surface inking process of No. 2, the ink gap for each zone in the metering element of the ink fountain 3 is set to a new setting corresponding to the new plate pattern to be used in the subsequent print job. It is possible to

Further, although different from the above method, first the old plate is removed and then the new plate is used.
It is also possible that it is laid on top of three.
In this case, the full printing of the new printing plate is carried out with the corresponding ink profile settings. The printing plate is then washed as described above. Eventually, individual printing can be started. But what is still possible is
This is to "remove" a new printing plate that is fully inked by supplying dampening water. That is, the ink on the entire surface is removed by supplying the dampening water on the area where the ink should not be applied. In this case, the washing process (as described above) is not necessary. Instead of cleaning the plate with the rubber cloth cleaning device, a plate cylinder cleaning device can be used.

[Brief description of drawings]

FIG. 1 is a diagram showing roller tiregrams of an inking device and a dampening water device of an offset printing machine.

FIG. 2 is a diagram showing the roller diagram shown in FIG. 1 in the case where there is a rubber cloth cleaning device attached to a blanket cylinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink device 2 Damper device 3 Ink fountain 4 Ink ejection roller 5 Ink transfer roller 6-10 Side swing roller 11-16 Transfer roller 17-25 Rubber roller 26 Dampening water container 27 Dampening water 28 Original roller 29 Metering roller 30 Rubber roller 32 Plate 33 Plate cylinder 34 Ink application roller 35 Dampening water application roller 36 Rubber cylinder 37 Rubber cloth cleaning device 38 Cleaning roller 39 Roller 40 Transfer roller 41 Spray device 42 Doctor device 43 Pan

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location B41F 35/02 35/06 (72) Inventor Bernd Mueller Germany Federal Republic 6907 Nossloch Kirschnerstraße 9

Claims (10)

[Claims] 1. In a rotary printing machine, in particular an offset printing machine, in which the printing device comprises a plate and a dampening device and an inking device with a constant ink profile set, a conventional ink profile is removed to obtain a new ink profile. To prepare the settings for the
A rotary printing press characterized in that the entire surface of 2) is inked. 2. For inking the entire surface of the plate (32),
The dampening device (2) is controlled such that the plate (32) is supplied with no or little dampening water,
The rotary printing press according to claim 1. 3. The dampening device (2) comprises at least one dampening fountain roller (35), the dampening fountain roller occupying a position remote from the plate during inking. The rotary printing machine according to Item 1 or 2. 4. A rubber cloth cleaning device (37) attached to the blanket cylinder (36), the rubber cloth cleaning device under the condition that the rubber cylinder (36) is pressed against the plate (32). Cleaning the inked plate (32) over the entire surface.
The rotary printing press according to any one of 1 to 3. 5. The inking unit (1) has at least one inking roller (34) which works in combination with the plate (32), said inking roller being provided during the cleaning of the plate (32). Occupying a position remote from
The rotary printing press according to any one of 1. 6. A plate having a plate, preferably 1 to 5.
A method of newly setting the ink profile of an inking unit of a rotary printing press according to any one of the preceding claims, in particular an offset printing press, preferably in order to carry out a new printing job. A method for newly setting an ink profile, characterized in that the entire surface of the plate (32) is inked by the inking device (1). 7. Method according to claim 6, wherein the inking is carried out without the supply of dampening water from the dampening device (2). 8. Method according to claim 6 or 7, characterized in that the plate (32) is washed after the previous destruction / uniformization of the ink profile. 9. The method according to claim 6, wherein the cleaning is performed by a rubber cloth cleaning device (37). 10. A plate to be used for a new print job is inked on the entire surface thereof, and then dampening water is supplied, so that no ink is applied to an uninked area in the main printing state. 10. The method according to any one of claims 6 to 9, wherein