EP1638773B1 - Method for operating an inking system - Google Patents

Abstract

The invention relates to a method for operating an inking system (01) on a rotary press. Said inking system comprises an inking device (03) for applying the colored printing ink (D, E) to the rollers of the inking system. The inking system (01) can be contacted directly with a printing cylinder (11) via at least one form roller (12, 13) and The printing cylinder (11) can be contacted directly with a blanket cylinder (60). The printing cylinder (11) is removed from the blanket cylinder (60) for the purpose of pre-inking the inking system (01), the rollers of the inking system are rotationally driven and at least the rollers of the inking system are pre-inked by applying colored ink using the inking device.

Description

The invention relates to a method for operating an inking unit according to the preamble of claim 1.

An inking unit is for example from the WO 98/51500 A1 known. In this inking unit, there are two color roller trains with which, independently of one another, color can be transferred from a central roller to a forme cylinder. The ink is thereby removed on the one hand by means of an inking roller from the central roller and transferred to the forme cylinder. In addition, two inking rollers each are present in the inking roller train, which likewise remove ink from the central roller and transfer it to the inking roller via a rider roller. The form cylinder in turn, which carries the printing plates, can be employed on a blanket cylinder, for example a blanket cylinder, in order to print in this way a printing material web running along the blanket cylinder in offset printing.

When starting such printing presses, the various rollers of the inking unit, the forme cylinder and the blanket cylinder are brought into contact with each other and then accelerated together. Once the various rollers and cylinders have reached a certain rotational speed, the inking device is set in motion, for example by switching on a paint pump. In this way, then the inking unit, the forme cylinder and the blanket cylinder is colored, at the same time decreases the printing material on the blanket cylinder color. A disadvantage of this process for inking the inking unit on a rotary printing press is that considerable amounts of the printing material web are consumed during the startup process required for inking the various rollers, which must then be disposed of as waste. Both by the Consumption of the printing material as well as their disposal are causing considerable costs.

The DE 101 11 363 A1 describes a printing unit for the flying plate change, wherein an inking unit is selectively employed on one or the other plate cylinder.

The DE 40 13 740 C2 discloses a printing unit in which are separated for pre-inking plate cylinder and blanket cylinder. The inking rollers are preferably employed for running in the ink on the plate cylinder, but can also be temporarily switched.

By the DE 101-15 121 A1 it is known to pre-inking off the inking rollers from the plate cylinder and in addition to separate the ink roller train.

The DE 101 29 555 A1 describes a method for doubling-reducing control of a printing press, in which the order of the Zylinderan- or shutdown is determined.

The DE 100 46 371 A1 discloses a method for pre-inking an inking unit, wherein a forme cylinder and / or a roller of the inking unit have a pre-inking speed.

The invention has for its object to provide a method for operating an inking unit.

The object is achieved by the features of claim 1.

The newly proposed method is based on the idea that the various inked during startup of the printing press rolls gradually be colored. For this purpose, a phase of pre-inking is proposed, during which at least the rollers of the inking unit are inked with printing ink, without the ink being conveyed on to the printing material web via the blanket cylinder. For this purpose, the form cylinder of the printing unit during Voreinfärbens from Blanket cylinder off, so that the ink can not be conveyed beyond the form cylinder addition. During the actual pre-inking, at least the rollers of the inking unit are driven in rotation and pre-colored by ink application by means of the inking device. In principle, it is conceivable that the form cylinder is also pre-colored at the same time as the rollers of the inking unit. Alternatively or in addition thereto, it is also conceivable that the forme cylinder is not in contact with the rollers of the inking unit during certain phases of the pre-inking or during the entire pre-inking of the inking unit.

According to a preferred variant of the method, at least two phases are provided during the pre-inking. In the first phase of the pre-inking, the inking rollers of the inking unit, which transfer the ink from the inking unit to the forme cylinder, are offset from the forme cylinder so that in this first phase only the rollers of the inking unit itself are pre-dyed. In the second phase of Voreinfärss then the inking rollers of the inking unit are employed on the forme cylinder and pre-colored at synchronous speed by ink transfer of the ink from the inking rollers. After the second phase of the pre-inking, the rollers of the inking unit and the forme cylinder are sufficiently supplied with printing ink.

To start the printing press, it is after the pre-inking required to accelerate the blanket cylinder to a synchronous speed with the forme cylinder, the speed is just to choose so that the peripheral speed of the blanket cylinder corresponds to the peripheral speed of the forme cylinder. Subsequently, the blanket cylinder is brought into engagement with the forme cylinder so that the ink can be transferred from the forme cylinder to the blanket cylinder.

Then then the blanket cylinder with the printing substrate, with synchronous web speed, are brought into contact, so that the offset printing process on the printing material begins. Due to the already pre-inked rollers of the inking unit or due to the pre-inked forme cylinder significantly less substrate web is required as waste until a print image with sufficient print quality is reached.

According to a preferred embodiment of the invention, the rollers of the inking unit or the forme cylinder should circulate during the pre-inking about 20 to 150 revolutions. This number of revolutions is usually sufficient to form a sufficient ink film on the rollers of the inking unit or the forme cylinder.

It is particularly advantageous if, during the pre-inking, a specific speed profile of the rollers of the inking unit or of the forme cylinder is traversed. During pre-inking, the rollers of the inking unit or of the forme cylinders can be accelerated to a pre-inking speed. This Voreinfärbegeschwindigkeit may preferably be chosen such that it the speed of the rollers of the inking unit at 150 to 250 revolutions / min. in particular about 180 to 200 revolutions / min. After sufficient pre-inking, the rollers of the inking unit and the forme cylinder are decelerated from the pre-inking rate to the setting speed before the synchronously rotating blanket cylinder is set against the forme cylinder. Subsequently, the rollers of the inking unit, the forme cylinder and the blanket cylinder can then be accelerated together to the intended printing speed. As a setting speed, a speed has been found that corresponds to a peripheral speed of 4 to 8 m / min, in particular about 6 m / min

Has proven particularly useful the newly proposed method for pre-inking the rollers of the inking unit or of the forme cylinder, if in so-called dry offset is worked, ie when the ink without additional dampening solution, especially without additional water, is processed.

An embodiment of the invention is illustrated in the drawings and will be described in more detail below.

Fig. 1

eine Seitenansicht eines schematisch dargestellten Farbwerks;

Fig. 2

das Geschwindigkeitsprofil verschiedener Walzen und Zylinder des in Fig. 1 dargestellten Farbwerkes während des Voreinfärbens.

Show it:

Fig. 1

a side view of a schematically illustrated inking unit;

Fig. 2

the speed profile of various rollers and cylinders of the in Fig. 1 illustrated inking unit during pre-inking.

An inking 01, z. B. a short inking unit 01 for a rotary printing press, consists essentially of an inking device 03, which emits an ink application to a color pickup roller 02 (hereinafter referred to as the central roller 02 or roller 02).

With the central roller 02 are one or more rollers 12; 13, z. B. inking rollers 12; 13 in touch.

The inking device 03 may, for. B. from a known chambered doctor blade 03 but also consist of several mutually contacting rollers, the color application z. B. from a conventional paint box or a pump or Farbaufsprüheinrichtung, etc. obtained. One or more color roller trains can be provided.

Is the central roller 02, z. B. formed as an anilox roller 02, so ink is transported with their wells or Haschuren.

Instead of the anilox roller 02 but also rollers of other construction can be used. You can z. B. have a smooth plastic jacket or other oleophilic rubber-elastic jacket or a ceramic jacket or a jacket made of glass. The ceramic or glass cladding can also be screened or have a surface structure produced in a different way. With the shell of the roller 02 is in addition to the inking device 03 and the inking rollers 12; 13 at least one roller 16 or 17, z. B. ink roller 16 or 17 with oleophilem coat in contact. With the inking rollers 12; 13 and each of the ink roller 16; 17 is a first roller 29 and 31, z. B. a first anilox roller 29 and 31 with their oleophilic coat in touch. On the inking rollers 12; 13, even more rider rollers with oleophilem coat can be placed, which in Fig. 1 are not shown. The ink rollers 16; 17 are on the roller 02 on and off. It is sufficient, the rollers 12; 13; 16; 17; 29; 31 and possibly further provided rollers to drive by friction. But they can also be driven in other ways, eg. B. by electric drives. They are each adjustable to their adjacent rollers or in addition to the roller 02, thereby being able to influence the width of the ink transfer strip.

The upper rollers 12; 29; 16 form a first inking roller train 20. The lower inking rollers 13; 31; 17 form a second color roller train 25. These two color roller trains 20; 25 are respectively from the central roller 02 via the respective first ink rollers 16; 17 and additionally on the inking rollers 12; 13 fed with ink. However, it is also possible to run one or both inking rollers 12 and 13 out of contact with the roller 02, thereby forming a color roller train 20; 25 off. Only the upper ink roller train 20 could be switched on and the lower ink roller train 25 switched off.

Further possibilities of influencing the ink application on a printing form 30 of a cylinder 11, z. B. form cylinder 11 via the inking rollers 12; 13 is when one of the two inking rollers 12 or 13 is brought out of contact with the forme cylinder 11 and the central roller 02. There then remain following rollers 12; 13; 16; 17; 29; 31 in contact: the rollers 16 and 17 with the central roller 02 and the rider roller 29 and 31, the rider roller 29 and 31 with their respective facing inking roller 12 and 13 respectively.

The rollers 12; 29; 16 of the first color roller train 20 are pivotally arranged together about the axis of rotation 10 of the roller 02.

The rollers 13; 31; 17 of the second ink roller train 25 are pivotally mounted together about the axis of rotation 10 of the roller 02.

The rollers 12; 29; 16, 13; 31; 17 both color roller trains 20; 25 are so far pivoted about the axis of rotation 10 from its working position A from the forme cylinder 11 that they can come from an approximately horizontal position in a nearly vertical position. They are independent of each other and reasonably movable one after the other. Before initiation of the pivoting process, the inking device 03 is to be removed from the inking unit 01. This creates space for temporary access to the rollers 12; 29; 16 of the first color roller train 20 or the rollers 13; 31; 17 of the second color roller train 25.

The diameter of the central roller 02 may be equal to, larger or smaller than the diameter of the rollers 12; 29; 16 and 13, respectively; 31; 17 be. It corresponds to a non-integer multiple of the aforementioned rollers 12; 13; 16; 17; 29; 31. The aforementioned rollers 12; 13; 16; 17; 29; 31 may all have different diameters from each other.

The two roll pin 18; 33; 21 and 19, respectively; 34; 22 of the rollers 12; 29; 16 or 13; 31; 17 and possibly additional rollers are in guides 23; 06; 26 and 24, respectively; 07; 27 arranged and against spring 28, z. B. compression springs 28 adjustable and adjustable. The guides 23; 06; 26 and 24, respectively; 07; 27 are each in both oscillators 08; 09 provided.

At the periphery of the forme cylinder 11, a blanket cylinder 60, which may be formed in particular in the manner of a blanket cylinder 60, are employed. In this way, the printed image can be transferred from the forme cylinder 11 to the blanket cylinder 60. The blanket cylinder 60 in turn can be attached to a printing material web, for example a paper web, in Fig. 1 not shown, come to rest in order to transfer in this way the printed image on the substrate web.

The procedure for pre-coloring the in Fig. 1 shown inking unit 01 is described below with reference to the in Fig. 2 illustrated speed profiles explained. Before the start of the pre-inking of the forme cylinder 11 of the inking rollers 12; 13 turned off so that no ink D or E of the inking rollers 12; 13 can be transferred to the forme cylinder 11. In addition, the blanket cylinder 60 is turned off by the forme cylinder 11.

At the beginning of the pre-inking (time t ₀ ), the different rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 accelerated together. Whether on the different rollers 02; 12; 13; 16; 17; 29; 31 and cylinders 11 of the inking unit 01 individual drives are provided or the drive movement is transmitted by friction is basically irrelevant. In Fig. 2 is the speed of the rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 represented by the peripheral speed of the inking roller 12.

Even before reaching the Voreinfärbegeschwindigkeit V ₁ , the inking device 03 is set at time t ₁ in operation to print in this way D or E of the To transfer inking device 03 on the roller 02 of the inking unit 01 and in this way these rollers 02, 12; 13; 16; 17; 29; 31 to pre-color together.

Shortly after time t ₁ , the single drive of the forme cylinder 11 is set in motion and accelerated linearly to a peripheral speed corresponding to the Voreinfärbegeschwindigkeit V ₁ . Once the forme cylinder 11 has reached the Voreinfärbegeschwindigkeit V ₁ and thus with synchronous peripheral speed relative to the inking rollers 12; 13 rotates, the forme cylinder 11 at time t ₂ to the inking rollers 12; 13 employed, so that the printing ink D or E of the inking rollers 12; 13 is transferred to the forme cylinder 11 to pre-inking this. Subsequently, the rollers rotate 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 and the forme cylinder 11 for a short time together at the Voreinfärbegeschwindigkeit V ₁ , wherein the forme cylinder 11 rotates during this synchronous operation at Voreinfärbegeschwindigkeit V ₁ approximately 20 to 150 revolutions.

Subsequently, the forme cylinder 11 and the rollers 02; 12; 13; 16; 17; 29; 31 of the inking unit 01 decelerated together from the Voreinfärbegeschwindigkeit V ₁ up to a Anstellgeschwindigkeit V ₂ . At about the same time, the blanket cylinder 60 is accelerated by the dedicated single drive to the Anstellgeschwindigkeit V ₂ . Once the blanket cylinder 60 and the die cylinder 11 rotate at synchronous peripheral velocity of, for example, 6 m / min, the blanket cylinder 60 is at the time t against the forme cylinder 11, _3, so that a running on the blanket cylinder 60 print substrate web is printed. Subsequently, the rollers are 02; 12; 13; 16; 17; 29; 31 of the inking unit 01, the forme cylinder 11 and the blanket cylinder 60 are accelerated together to the desired printing speed. From the time t ₄ then the printing material web is printed with sufficient quality.

The Voreinfärbegeschwindigkeit V ₁ results from a speed of the forme cylinder 11 of 6000 to 14000 U / h, in particular 8000 to 12000 U / h and / or is 6000 to 14000 m / h, in particular 8000 to 12000 m / h.

The setting speed (V ₂ ) is smaller than the Voreinfärbegeschwindigkeit (V ₁ ) and corresponds to 0m / min or 4 to 8m / min, in particular about 6m / min.

After setting of forme cylinder 11 and blanket cylinder 60 they are accelerated to a production speed, the production speed is higher than the pitch.

The inking unit 01 is rotatively driven by its own motor and has no positive connection to the forme cylinder 11th

Form cylinder 11 and blanket cylinder 60 are driven by their own position-controlled motors, these cylinders are not for rotary drive in positive drive connection.

LIST OF REFERENCE NUMBERS

01

Inking unit, short inking unit

02

Roller, central, ink pickup roller, anilox roller

03

Paint application device, chambered doctor blade

04

-

05

-

06

Leadership (29)

07

Leadership (31)

08

Schwinger

09

Schwinger

10

axis of rotation

11

Cylinder, forme cylinder

12

Roller, inking roller, iridescent

13

Roller, inking roller, iridescent

14

-

15

-

16

Roller, ink roller, iridescent

17

Roller, ink roller, iridescent

18

Rollers (12)

19

Roll neck (13)

20

Color roller train, first

21

Rollers (16)

22

Rollers (17)

23

Leadership (12)

24

Guide (13)

25

Color roller train, second

26

Leadership (16)

27

Leadership (17)

28

Spring, compression spring

29

Roller, anilox roller, iridescent

30

printing form

31

Roller, anilox roller, iridescent

32

-

33

Rollers (29)

34

Rollers (31)

35 to 59

-

60

Blanket cylinder, blanket cylinder

A

working position

D

printing ink

e

printing ink

t ₀

time

t ₁

time

t ₂

time

t ₃

time

t ₄

time

V ₁

Voreinfärbegeschwindigkeit

V ₂

adjustment rate

Claims (24)

1. A method of operating an inking unit (01) in a printing couple of a rotary printing press, with an ink-application device (03) for the application of the printing ink (D; E) to at least one roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01), wherein the inking unit (01) is capable of being brought into direct contact with a forme cylinder (11) by at least one ink-application roller (12; 13), and wherein the forme cylinder (11) is capable of being set on a cylinder (60), wherein the roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) and/or the forme cylinder (11) is at a pre-inking speed (V₁) during a pre-inking, and wherein the forme cylinder (11) is set off from the cylinder (60) during the pre-inking, characterized in that before coming into contact with the cylinder (60) the roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) and the forme cylinder (11) are braked, starting from a pre-inking speed (V₁), to a setting-on speed (V₂) or to a standstill.
2. A method according to Claim 1, characterized in that the forme cylinder (11) is set off from the other cylinder (60) for the pre-inking of the inking unit (01), the roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) is driven in a rotating manner and at least the roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) is pre-inked by the application of ink by the ink-application device (03).
3. A method according to Claim 1, characterized in that the forme cylinder (11) is pre-inked with the roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01).
4. A method according to Claim 1, characterized in that in a first phase of the pre-inking the ink-application roller (12; 13) is set off from the forme cylinder (11), wherein the roller (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) is driven in a rotating manner and is pre-inked by the application of ink by the ink-application device (03), and in a second phase of the pre-inking the forme cylinder (11) driven in a rotating manner at a synchronous rotational speed is set against the ink-application roller (12; 13) and is pre-inked.
5. A method according to any one of Claims 1 to 4, characterized in that the forme cylinder (11) is brought to abut after the end of the pre-inking with the cylinder (60) rotating at a synchronous rotational speed.
6. A method according to Claim 1, 2 or 5, characterized in that the cylinder (60) is constructed in the form of a blanket cylinder (60).
7. A method according to Claim 1, 2 or 5, characterized in that the cylinder (60) is constructed in the form of a counter-impression cylinder, and a material to be printed is printed between the forme cylinder (11) and the counter-impression cylinder.
8. A method according to Claim 6, characterized in that after the contacting with the forme cylinder (11) the blanket cylinder (60) is brought to abut against the material to be printed running off at a synchronous rotational speed.
9. A method according to any one of Claims 1 to 4, characterized in that the rollers (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) and/or the forme cylinder (11) rotate or rotates at approximately from 20 to 150 revolutions during the pre-inking.
10. A method according to Claim 1, characterized in that the pre-inking speed (V₁) results from a rotational speed of the rollers (02; 12; 13; 16; 17; 29; 31) of the inking unit (01) of from 150 to 250 r.p.m., in particular from approximately 180 to 200 r.p.m.
11. A method according to Claim 1, characterized in that the pre-inking speed (V₁) results from a rotational speed of the forme cylinder (11) of from 6,000 to 14,000 r.p.h., in particular from 8,000 to 12,000 r.p.h.
12. A method according to Claim 1, characterized in that the pre-inking speed (V₁) amounts to from 6,000 to 14,000 m/h, in particular from 8,000 to 12,000 m/h.
13. A method according to Claim 1, characterized in that the setting-on speed (V₂) is lower than the pre-inking speed (V₁).
14. A method according to Claim 1, 5 or 8, characterized in that the setting-on speed (V₂) corresponds to a peripheral speed of from 4 to 8 m/min, in particular approximately 6 m/min.
15. A method according to Claim 1 or 10 to 13, characterized in that the setting-on speed (V₂) corresponds to 0 m/min.
16. A method according to Claim 1, characterized in that the printing ink (D; E) is processed without dampening agent, and in particular without water.
17. A method according to Claim 1, characterized in that the inking unit (01) is constructed in the manner of a short-train inking unit (01) with a central roller (02).
18. A method according to Claim 17, characterized in that the central roller (02) is constructed in the manner of an anilox roller (02).
19. A method according to Claim 17 or 18, characterized in that at least one further ink roller (16; 17) is provided on the inking unit (01) in the vicinity of the central roller (02) and at least one ink-application roller (12; 13), wherein the ink roller (16; 17) is capable of being brought directly into contact with a rider roller (29; 31), wherein the rider roller (29; 31) is capable of being brought directly into contact with the ink-application roller (12; 13).
20. A method according to Claim 1, characterized in that the ink-application device (03) is constructed in the manner of a chambered doctor blade (03).
21. A method according to Claim 6, characterized in that the blanket cylinder (60) is constructed in the manner of a rubber-blanket cylinder (60).
22. A method according to Claim 1, characterized in that after the forme cylinder (11) and the cylinder (60) are set on they are accelerated to a production speed, wherein the production speed is higher than the setting-on speed.
23. A method according to Claim 1, characterized in that the inking unit (01) is driven by a separate motor, and the inking unit (01) has no connexion with positive locking to the forme cylinder (11) for the rotational drive.
24. A method according to Claim 1, characterized in that the forme cylinder (11) and the cylinder (60) are driven by separate motors regulated in their position in each case, and the said cylinders are not connected in a driving manner with positive locking to the rotational drive.

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