EP1235685B1 - Inking system for a printing machine - Google Patents

Abstract

An inking system for a printing machine which has a relatively simple design and which is adapted for more stable ink transfer to a plate cylinder. The inking system includes an ink supply roller (15), one or more drivable inking unit rollers (14, 19), an adjustment system for establishing a predetermined nip (19) between the ink supply roller and one of the drivable unit inking rollers (14, 19), and at least one movable calender roller (10) in constant contact with one of the drivable inking unit rollers operable for selectively interrupting the ink transfer.

Description

The invention relates to an inking unit for a printing press according to the generic terms of main and secondary claim.

[State of the art]

From DE 30 08 981 A1 an inking unit of this type is for one Printing machine known as an adjustable lifter / film inking unit is operable. The inking unit consists of one Ink fountain with upstream ink fountain roller and one between the ink fountain roller and a downstream inking roller oscillating lifter roller. The lifter roller can be stopped, if in film operation between the ink fountain roller and an additional roller can be adjusted in the downstream inking roller is.

A lifter inking unit is known from DE 37 06 602 C2. After that is the ink to be processed by an ink fountain roller as Ink feed roller to a first by means of an inking roller Inking roller (1st inking roller) transferable. Still is a inking roller train downstream of the first inking roller and has several inking rollers resting on a plate cylinder on. It is in the direction of rotation of the plate cylinder a first upstream inking roller with a downstream inking roller by an ink roller coupled. There is one in the inking roller above Ink distribution roller arranged, which on the one hand with the Ink supply (ink fountain roller, ink lifter roller and first Ink roller) and on the other hand with a first and a for this purpose, the second roll strand connected in parallel with the am Functional connection of the inking rollers on the plate cylinder is.

FR 574 658 is also a lifter inking unit for one Printing machine known in the between the ink fountain roller and the downstream ink fountain roller with single drum roller oscillating inking roller is arranged. The downstream Inking roller is at least in constant frictional contact a first calender roll stored in a variable position assigned, with the ink transport to the roller train between the first calender roll and a downstream second Inking roller is periodically separable. The movement of the Lifter roller is connected with the movement of the calender rollers common curve control coupled.

Unwanted vibrations are excited in the inking unit by the moving masses.
When the ink is fed by means of an inking roller, a lifting stroke occurs due to the impact of the lifting roller on the first inking roller, which excites undesirable vibrations in the inking unit. Color density fluctuations in the inking unit caused by the ink lifter strip also occur, which are reduced by a large number of nip locations (large number of inking rollers in the roller train).

OBJECT OF THE INVENTION

The invention is based on the object, an inking unit for to create a printing press that has the disadvantages mentioned avoids that in particular a stable color guide in the Inking unit allowed and a simple structure in the inking roller train allowed.

The task is solved by the training features of Main and secondary claim. Further training results from the subclaims.

One advantage of the inking unit according to the invention is that the simple construction according to the invention makes it possible to achieve a noticeable reduction in the number of rollers within the roller train. Another advantage is that there is no siphon in the inking unit.
It is also advantageous that the ink is supplied without an inking roller and fluctuations in ink density are noticeably reduced. This means that stable ink guidance can be achieved even with a single drum roller with a small number of inking rollers.

Another advantage is that the color flow in the Inking unit specially assigned to the first one of the ink supply Inking roller (1st or 2nd inking device) can be separated in time and at the same time that of the ink feed roller (e.g. the Ink fountain roller) transferred ink film on the outer surface this inking roller (1st or 2nd inking device) is leveled.

Finally, it is advantageous that the movement of the ink feed roller preferably with the movement of at least one on the first drivable inking roller (1st inker and / or on the second drivable inking roller (2nd inking device) Calender roll can be coupled to the formation of the accelerate the desired color film.

With the means according to the invention is a short, responsive and inking unit that can be achieved with little effort created, which the required print quality process stable generated.

[Examples]

Fig. 1

ein erstes Farbwerk mit einer konstanten Farbzuführung,

Fig. 2

ein erstes Farbwerk mit einer getakteten Farbzuführung,

Fig. 3

ein zweites Farbwerk mit einer konstanten Farbzuführung,

Fig. 4

ein zweites Farbwerk mit einer getakteten Farbzuführung,

Fig. 5

ein zweites Farbwerk mit einer konstanten Farbzuführung und zwei Kalanderwalzen im Walzenzug.

The invention will be explained in more detail using an exemplary embodiment. The following schematically show:

Fig. 1

a first inking unit with a constant ink supply,

Fig. 2

a first inking unit with a clocked ink feed,

Fig. 3

a second inking unit with a constant ink supply,

Fig. 4

a second inking unit with a clocked ink feed,

Fig. 5

a second inking unit with a constant ink supply and two calender rollers in the single drum roller.

In an offset printing press is in a printing unit Inking unit for inking one on a plate cylinder 2 fixable printing form arranged. The plate cylinder 2 is with a blanket cylinder 1 and the blanket cylinder 1 with a bow guide cylinder in functional connection. For the wet offset printing is the plate cylinder 2 in its direction of rotation in front of the inking unit a dampening unit 3 with a dampening solution tank 4 assigned. The dampening unit 3 is preferred can be integrated into the inking unit using a switchable bridge roller. Alternatively, the printing unit is also available in dry offset (dampening solution-free offset printing) operable. That’s it Dampening unit 3 or at least the dampening roller from the plate cylinder 2 separable and / or at least from the dampening solution supply separable or the printing unit is without a dampening unit 3 trained.

The inking unit consists, among other things, of an ink feed system, which at least consists of a drivable, colorable Ink feed roller 15 is formed. In the present example is the ink feed roller 15 is an ink fountain roller, which with a Ink metering device and an ink fountain 16 in functional connection is. The ink supply system is also an alternative by means of at least one of the ink feed roller 15 directly assigned, preferably axially to the ink feed roller 15 movable paint dispenser executable.

1 and 2, the ink feed roller 15 with a Inking unit directly downstream of the first inking roller 14 (1st color driver) in functional connection, this first Inking roller 14 preferably axially changeable and in particular can be driven in rotation. The first inking roller 14 (1st color driver) is arranged after a single drum roller, which among other things With a plurality of inking rollers assigned to the plate cylinder 2 5 is in functional connection.

In the single drum roller according to FIGS. 1 and 2, the drivable first inking roller 14 is followed by several, in the present example three, transfer rollers 12. A transfer roller 12 is followed by a second inking unit roller 9 (2nd inking device), which is preferably axially changeable and in particular can be driven in rotation.
The second inking roller 9 is frictionally associated with a first calender roller 10 in constant contact on the roller circumference, which periodically can be brought into a functional connection with an ink roller 7 following here in the direction of the plate cylinder 1, here a distributor roller. This inking roller 7 is preferably in direct contact with two inking rollers 5 assigned to the plate cylinder 2 (2nd and 3rd inking rollers in the direction of rotation of the plate cylinder). The ink transport can be separated by the movable calender roller 10 to the roller train with at least one inking roller 5 at a separation point.

1 and 2, the second inking roller 9 is additional to the first calender roll 10 a transfer roll 11 in assigned constant contact. Towards plate cylinder 2 is in constant contact with the transfer roller 11 this one preferably axially changeable and in particular rotative drivable third inking roller 6 (3rd inking device) arranged downstream, which is in contact with two inking rollers 5. These inking rollers 5 are in the direction of rotation of the plate cylinder 2 arranged as first and second inking rollers 5. In the direction of rotation of the plate cylinder 2 are still the first and second inking rollers 5 two more inking rollers 5 (3rd and 4th inking roller in the direction of rotation of the plate cylinder), which is preferred with a axially changeable and in particular driven by rotation fourth inking roller 8 (4th inking device) in functional connection are.

For the ink supply, the ink supply roller 15 with a Setting system 13 in functional connection. For example this is an eccentrically adjustable cam roller for adjustment a gap 19 between the ink feed roller 15 and the directly assigned first inking unit roller 14 (FIGS. 1 and 2). The setting system 13 with an option is preferred fixed or portable stop 18, alternatively a control curve, in contact.

Between the ink feed roller 15 and the first inking roller 14 (1st color driver) is for setting the desired film thickness the gap 19 by means of the adjustment system 13 and the stop 18 adjustable to a defined size, the gap size is preferably less than 1 mm. This is where the ink is fed from the ink feed roller 15 directly to the first inking roller 14 by means of color splitting. So that is in the gap 19 constant size an uninterrupted, thin layer of paint (Color film) in the subsequent roller train of the inking unit transferable so that as shown in Fig.1 a constant There is ink supply in the inking unit. The closer below explained further training of the ink fountain 16 with a Swivel joint 17 - if present - is stopped.

In an apprenticeship 2, the ink fountain 16 with the ink supply roller 15 is mounted in at least one swivel joint 17 in an axis of rotation. The ink fountain 16 can be pivoted with the ink supply roller 15 (and ink metering device) by means of at least one actuating device in the swivel joint 17 and intermittently toward the first inking unit roller 14 mounted on the frame or can be moved away therefrom. For example, at least one working cylinder or at least one portable stop 18 can be used as the actuating device. The gap 19 which has already been defined and set ensures the desired film thickness and that the ink supply roller 15 does not make any contact with the first inking unit roller 14. Due to the clocked pivoting movement of the inkable ink supply roller 15, the set gap 19 is increased beyond the (metered) layer thickness located on the ink supply roller 15, such that the ink film formation to the first inking unit roller 14 is interrupted in cycles. This means that a thin layer of ink (ink film) can only be fed periodically into the downstream roller train.
This clocked mode of operation of the ink supply roller 15 is useful, for example, synchronously or asynchronously when the channel of the plate cylinder 2 is passed. This method of operation can also be implemented taking into account the print subject.

Is preferred in the direction of rotation of the ink feed roller 15 before Gap 19 arranged the ink metering device.

In the designs according to Figures 1 and 2, the transfer roller 11 alternatively also available as a calender roll (2nd calender roll). Here, the transfer roller 11 is in constant frictional engagement Contact to the second inking roller 9 and is with the downstream third inking roller 6 periodically in Contact can be brought.

Another training is that of the first inking unit roller 14 (1st color driver) immediately adjacent transfer roller 12 executable as a calender roll. This transfer roller 12 is in constant contact with the first inking roller 14 and is periodically with the downstream transfer roller 12 in Contact can be brought.

Another training is in combination in an inking unit the first inking roller 14, the transfer roller 12 as Calender roller and the second inking roller 9 at least assigned a calender roll 10.

The inking unit according to Figures 1 and 2 is with a relatively long, i.e. many rollers with a corresponding number of nips having, single drum roller executed.

According to FIGS. 3 to 5, the inking unit roller train is wider can be shortened by the transfer rollers 12 and the first inking roller 14 (1st color driver) are eliminated. The ink feed takes place at least by means of the colorable, with an adjustment system 13 functionally connected ink feed roller 15 directly on the preferably axially changeable and in particular second inking roller 9 that can be driven in rotation (2.Farbreiber). Between the rollers 15, 9 is by means of an adjustment system 13 a defined gap 19 can be fixed. The second Inking roller 9 is again the first on the circumference Calender roll 10 assigned in constant frictional contact, which periodically with the plate cylinder 1 subsequent inking unit roller 7 (distributor roller), which in turn is in contact with two inking rollers 5, in functional connection is feasible. The calender roll 10 is in frictional engagement to the inking unit roller 9 mounted so that the Ink transport to the roller train with at least one inking roller 5 is periodically separable at a separation point.

The second inking roller 9 is additionally in circumference constant contact assigned the transfer roller 11. In the direction Plate cylinder 2 is in constant contact with the transfer roller 11 this is the preferably axially changeable and in particular third inking roller 6 which can be driven in rotation (3rd color driver) subordinate, which with the following two inking rollers 5 (1st and 2nd inking rollers) in Contact is. In the direction of rotation of the plate cylinder 2 are these inking rollers 5 two further inking rollers 5 subordinate, with a preferably axially changeable and in particular fourth inking roller 8 that can be driven in rotation (4th color driver) are in contact.

3-5 is preferably in the direction of rotation Ink feed roller 15 in front of the gap 19, the ink metering device arranged. Alternatively, according to the training. FIG. 3-5 an ink dispenser can be used, which to the ink supply roller 15 is axially movable.

According to Figure 3 is between the ink feed roller 15 and the second inking roller 9 (2nd inking device) at a defined Gap size in the gap 19 for a constant ink supply following second inking unit roller 9 by means of an adjustment system 13 realizable. If present, the ink fountain 16 is included dyeable ink feed roller 15 stopped in the pivot joint 17. The ink is transferred directly from the ink feed roller 15 to the second inking roller 9 by means of ink splitting in Gap 19, the gap size of which is preferably less than 1 mm is. The transfer roller 11 is optionally a calender roller or in constant contact with the second inking roller 9 (2nd ink driver) and to the third inking roller 6 (3rd color driver) switchable. There is a in these trainings periodic or constant color flow over the front-heavy Single drum roller guaranteed. However, the connection between the first calender roll 10 and the inking roll 7 (distribution roll) periodically separable.

According to FIG. 4, the ink fountain 16 is with ink feed roller 15 by means of an actuator, e.g. at least one working cylinder or a stop 18 about the axis of the swivel 17 intermittently onto the second inking roller 9 (2nd inking device) too movable or movable away from it. For the ink feed the ink supply roller 15 is the adjustment system 13 (preferably with stop 18) for setting the gap 19 the desired film thickness between the ink feed roller 15 and assigned to the second inking roller 9. The gap 19 ensures here too that there is no contact with the inking roller 9 he follows. According to Figure 4 is a clocked ink supply (similar to Figure 2) by the preferred pivoting movement of the Ink feed roller 15 can be realized. That the color film formation is interrupted intermittently to the second inking roller 9 that periodically a layer of paint (paint film) in the subsequent Single drum roller is transferable.

At least one calender roller 10 and one transfer roller 11 are assigned to the second inking roller 9 (2nd inking device), the transfer roller 11 optionally also being operable as a second calender roller. The calender roller 10 is circumferentially in contact with the second inking roller 9 and can be contacted periodically with the inking roller 7 (distributor roller). The transfer roller 11 is arranged on the circumferential side in constant contact with the second inking roller 9 (2nd inking device) and the downstream third inking unit roller 6 (3rd inking device).
Alternatively, the transfer roller 11 can also be designed as a second calender roller (analogous to the calender roller 10), periodically contactable with the third inking roller 6 (3rd inking device).

In Figure 5, the inking unit is preferably designed analogously to Figure 3. The inkable inking roller 15 with ink fountain 16, if present, can be stopped in the swivel joint 17. A constant ink supply can be achieved through the gap 19 fixed by means of the setting system 13.
Alternatively, the inking unit (FIG. 5) is also designed according to FIG. 4. The ink feed roller 15 can be moved in a clocked manner in order to periodically enlarge the defined gap 19 and to realize a clocked ink feed.

The second inking roller 9 are gem. Fig. 5 circumferentially two calender rolls 10, 11 (transfer roll 11 as a calender roll) assigned.

In an embodiment, the ink feed roller 15, which can be driven in rotation, is coupled with the pivoting movement of at least the first calender roller 10 (preferably also with the transfer roller 11 as a calender roller) in such a way that the rollers 15, 10, 11 can be driven synchronously.
In a further embodiment, two separate gears can be used, the ink supply roller 15 being optionally drivable synchronously or preferably asynchronously with the first calender roller 10 or with the transfer roller 11.

The ink is supplied by means of the drivable, colored one Ink feed roller 15 through the gap 19 to be driven first inking roller 14 (according to Fig. 1-2). Here there is no contact between the ink feed roller 15 and the first Inking unit roller 14. The inking unit roller 14 increases depending on (by means of Adjustment system 13) set film layer thickness Ink from the ink feed roller 15 constant or periodic (with a clocked ink feed roller 15) and leads this to the downstream transfer rollers 12.

From the transfer rollers 12, the printing ink is split by ink fed to the drivable second inking roller 9. is the first frictionally applied to the ink feed roller 15 Transfer roller 12 as swinging around the ink feed roller Calender roller formed, so the ink film on the Ink feed roller 15 leveled and periodically to the next Transfer roller 12 transported.

The calender roll 10 is frictionally on the second Inking roller 9 and swings about the axis of the inking roller 9 such that the calender roll 10 in constant frictional engagement Contact with the inking roller 9 remains and at the same time the ink flow to the downstream ink roller 7 is periodically separable. In this training, the Calender roller 10 on the outer surface of the inking roller 9 existing color film into a uniform color film. Furthermore, the ink is periodically applied to the inking roller 7 and subsequent to the inking rollers 5, including the fourth inking roller 8, transferred. To the inking unit roller 9 is still the transfer roller 11 in constantly frictional Contact. The transfer roller 11 is preferably optional for the constant transfer of color in contact with the subordinate third inking roller or for periodic transfer of color as a calender roll, analogous to the calender roll 10, trained.

In the training acc. Fig. 3-5 is the color feed directly from the ink feed roller 15 to the second inking roller 9. The further color flow is analogous to the above. Procedure.

[REFERENCE LIST]

1 -

Blanket cylinder

2 -

plate cylinder

3 -

dampening

4 -

Dampening solution container

5 -

Inking roller

6 -

third inking roller

7 -

Inking roller

8th -

fourth inking roller

9 -

second inking roller

10 -

first calender roll

11 -

Transfer roll

12 -

Transfer roll

13 -

adjustment

14 -

first inking unit roller

15 -

ink supply

16 -

paintbox

17 -

swivel

18 -

attack

19 -

gap

Claims (8)

1. Inking unit for a printing press with an ink feed unit having a drivable ink feed roller and a drivable ink feed roller with at least one downstream arranged roller train as well as at least one ink applicator roller fitted to a plate cylinder, characterised in that the ink feed roller (15) is functionally connected with an adjustment system (13),
   that the ink feed roller (15) is arranged directly against a drivable first inking unit roller (14), wherein between these rollers (15, 14) a defined slot (19) can be set by the adjustment system (13),
   that several transfer rollers (12) are arranged downstream of the first inking unit roller (14) and that a drivable second inking unit roller (9) follows a transfer roller (12), which is in continuous frictional contact with at least one first neighbouring calendar roller (10) mounted position-changeably, so that the ink transport to the roller train having at least one ink applicator roller (5) is periodically interruptable at a separating position.
2. Inking unit for a printing press with an ink feed unit having a drivable ink feed roller and a drivable inking unit roller with at least one downstream arranged roller train as well as at least one ink feed roller fitted to a plate cylinder, characterised in that the ink feed roller (15) is functionally connected with an adjusting system (13),
   that the ink feed roller (15) is fitted directly against a drivable inking unit roller (9), wherein between these rollers (15, 9) a defined slot (19) can be set by the adjusting system (13),
   that fitted to the inking unit roller (9) in continuous frictional contact therewith is at least one first neighbouring calendar roller (10) mounted position-changeably, so that the ink transport to the roller train having at least one ink applicator roller (5) is periodically interruptable at a separating position.
3. Inking unit according to Claim 1 or 2, characterised in that fitted to the second inking unit roller (9) in continuous frictional contact therewith is a transfer roller (11) which follows a drivable third inking unit roller (6) with ink applicator rollers (5).
4. Inking unit according to Claim 3, characterised in that the transfer roller (11) is arranged in continuous contact relative to the inking unit roller (6).
5. Inking unit according to Claim 3, characterised in that the transfer roller (11) as a calendar roller can be brought periodically into contact with the inking unit roller (6).
6. Inking unit according to Claim 1, characterised in that the ink feed roller (15) is rhythmically movable relative to the drivable first inking unit roller (14) in order periodically to increase the defined slot (19).
7. Inking unit according to Claim 2, characterised in that the ink feed roller (15) is rhythmically movable relative to the drivable second inking unit roller (9) in order periodically to increase the defined slot (19).
8. Inking unit according to Claim 1, characterised in that the first transfer roller (12) fitted to the first inking unit roller (14) is constructed in continuous frictional contact relative to the inking unit roller (14) as a position variable calendar roller and the ink transport to the downstream arranged transfer roller (12) is periodically interruptable.

Images