EP0974461B1 - Vibrator-type inking system for a printing machine - Google Patents

Abstract

The ink lifting roller (2) is suspended between an ink supply roller (1) and a first driven ink unit roller (8), with at least one following set of rollers (15) and at least one ink applicator roller (12) belonging to a plate cylinder.(17). At least one first calender roller (10) is in constant frictional contact with the first ink unit roller. The ink is carried to the set of rollers and at least one ink applicator roller and is periodically separated at a separation point between the first calender roller and a subsequent second ink unit roller(11).

Description

[State of the art]

A lifter inking unit of this type is known from DE 37 06 602 C2. Thereafter, the printing ink to be processed can be transferred from an ink fountain roller as an ink feed roller by means of an ink lifter roller to a first inking roller as the first inking roller. Furthermore, an inking roller train is arranged downstream of the inking roller and has several inking rollers resting on a plate cylinder. In the direction of rotation of the plate cylinder, an upstream inking roller is coupled to a downstream inking roller by an inking roller. An ink distribution roller is arranged in the inking unit roller, which is on the one hand functionally connected to the ink supply (ink fountain roller, inking roller and first inking roller) and on the other hand to a first and a second roller train connected in parallel with at least one inking roller resting on the plate cylinder.

When ink is fed using an inking roller, there are fluctuations in ink density in the inking unit caused by the inking strip, which should be reduced by a large number of inking rollers (several nip points).

From EP 0 475 120 A1 a further lifter inking unit is known with a lifter roller arranged in an oscillating manner between an ink fountain roller and a first transfer roller. The first transfer roller can be driven separately and is in positive rotary contact with an adjacent oscillating roller. In order not to transfer torsional vibrations generated by the jack stroke to the downstream roller train, the vibrating roller is mounted in a movable frame and is coupled to the first transfer roller by means of a gear train. The frame with the vibrating roller can be moved in such a way that the vibrating roller is kept out of the contact position with a downstream second transfer roller of the roller train when the lifting roller is moved against the surface of the first transfer roller.

Another lifter inking unit is known according to DE 39 17 074 A1. The first transfer roller (ink rubbing cylinder) is followed by an ink roller, which is coupled to a lifting device. The lifting device is designed as a cam and coupling gear and separates the inking roller from the inking cylinder in the lifting cycle shortly before the lifting roller contacts the inking cylinder.

Furthermore, from FR-A-574 658 a lifter inking unit with a lifter roller oscillating between an ink fountain roller and a first drivable inking unit roller and at least one downstream roller train with inking rollers is known. In frictional contact, the first inking roller is associated with at least one mounted first calender roller so as to be spatially changeable, the ink transport to the roller train being periodically separable. A cam mechanism and a coupling gear are provided for controlling the separating movement, the cam mechanism simultaneously serving to control the lifting movement.

OBJECT OF THE INVENTION

The invention has for its object to provide a lifter inking unit for a printing press, which avoids the disadvantages mentioned, which allows stable ink guidance in the inking unit and allows a simple construction of the inking roller train.

According to the invention the object is achieved by the training features of the main claim. Further training results from the subclaims.

An advantage of the lifter inking unit according to the invention is based on the fact that the simple structure enables a noticeable reduction in the number of rollers within the inking roller train. It is also advantageous that fluctuations in color density produced by the lifting strip are noticeably reduced. This means that stable ink guidance can be achieved even with a single drum roller with a significantly smaller number of ink rollers and / or with ink rollers with relatively small roller diameters. Furthermore, it is advantageous that the ink flow in the inking unit can be separated in time, in particular on the first inking unit roller, and at the same time the lifting strip transferred from the inking roller is leveled as a uniform ink film on the lateral surface of this first inking unit roller. Finally, it is an advantage that the movement of the ink lifter can be coupled with the movement of at least one calender roller resting on the first inking unit roller, since the formation of the desired ink film can thus be accelerated.

With the means according to the invention, a short, responsive, and low-effort lifter inking unit was created, which produces the required print quality in a process-stable manner.

[Examples]

The invention will be explained in more detail using an exemplary embodiment.

Fig. 1

ein erstes Heberfarbwerk mit einer an einer Farbzuführwalze anliegenden Farbheberwalze,

Fig. 2

das Heberfarbwerk gemäß Fig. 1 mit einer an einer ersten Farbwerkwalze anliegenden Farbheberwalze,

Fig. 3

ein zweites Heberfarbwerk mit einer an einer Farbzuführwalze anliegenden Farbheberwalze,

Fig. 4

das Heberfarbwerk gemäß Fig. 3 mit einer an einer ersten Farbwerkwalze anliegenden Farbheberwalze.

The following schematically show:

Fig. 1

a first lifter inking unit with an ink lifter roller resting on an ink feed roller,

Fig. 2

1 with an ink fountain roller resting on a first inking roller,

Fig. 3

a second lifter inking unit with an ink lifter roller resting on an ink feed roller,

Fig. 4

the lifter inking unit according to FIG. 3 with an inking unit roller resting against a first inking unit roller.

In an offset printing press, an inking unit 16 for inking a printing form is arranged on a plate cylinder 17 in a printing unit. For wet offset printing, a dampening unit 14 is assigned to the plate cylinder 17, upstream of the inking unit 16. The dampening unit 14 can be integrated into the inking unit 16 by means of a switchable bridge roller 13. Alternatively, the printing unit and especially the inking unit 16 can also be operated in dry offset (waterless offset printing). For this purpose, the dampening unit 14 or at least the dampening application roller can be separated from the plate cylinder 17 or at least separated from the dampening solution supply, or the printing unit is designed without a dampening unit 14.

The inking unit 16 consists, inter alia, of a drivable ink feed roller 1 which is functionally connected to an ink metering system, preferably an ink fountain. An inking roller 2 is arranged in an oscillating manner between the inking roller 1 and a first inking roller 8 arranged downstream in the inking unit 16. The first inking roller 8 is preferably an axially oscillating friction roller. A lifting shaft 3 is arranged parallel to the inking roller 2. The inking roller 2 is on both sides with its roller journals in a roller lever 4 stored, which are coupled to the frame-mounted lifter shaft 3.

The first inking roller 8 (first inking roller) is followed by a roller train 15 which is functionally connected to a plurality of inking rollers 12 assigned to the plate cylinder 17.

According to FIGS. 1 and 2, the first inking roller 8 is followed by a first calender roller 10 - in constant contact on the roller circumference, which can be periodically brought into functional connection with a second inking roller 11, preferably designed as an inking roller. Depending on the design of the inking unit 16, the second inking roller 11 is followed by a plurality of ink transport rollers or inking rollers within the roller train 15, which are functionally connected to the inking rollers 12.

The first inking unit roller 8, which is mounted on the frame, has an axially aligned first swivel joint 9 on both sides, each swivel joint 9 being laterally coupled to a first rocker arm 6. On the one hand, the first rocking levers 6 carry at least one first adjusting element 5 and, on the other hand, the bearings for the first calender roll 10 accommodated therein. At least one first rocking lever 6 is preferably functionally connected to a force-storing first damping element 7. At least one of the two roller levers 4 is designed such that it can be brought into functional connection with the adjusting element 5. Instead of this embodiment, the first adjustment elements 5 can also be arranged on at least one roller lever 4 in a further embodiment.

According to FIGS. 3 and 4, the first inking roller 8 is followed by the first calender roller 10 and additionally a second calender roller 21 on the circumference of the roller. The first calender roll 10 can in turn be periodically brought into functional connection with the second inking roller 11. The second calender roller 21 can be periodically brought into functional connection with a third inking unit roller 26, preferably an inking roller. The inking rollers 11, 26 can in turn be followed by a plurality of ink transport rollers and / or inking rollers within the roller train 15.

In the present example, the inking rollers 11, 26 are functionally connected directly to the inking rollers 12 and thus create a short roller train 15. The first calender roller 10 is arranged in the first rocker arms 6 analogously to FIGS. 1 and 2. The rocker arms 6 in turn have at least one first adjusting element 5 and preferably at least one associated damping element 7 and are each mounted in a first swivel joint 9. In addition to the coupling to the first rocking levers 6, the rotary joints 9 are each connected to a laterally arranged coupling 25 in order to receive the roll journals of the second calender roll 21 in a bearing. Each coupling 25 is coupled in terms of transmission technology to a second rocker arm 27, which is mounted in a second swivel joint 22 fixed to the frame. Each connection is preferably designed as a rotary-push joint with a joint degree of freedom f = 2.

At least one second rocker arm 27 carries a second adjusting element 23, which can be brought into functional connection with at least one roller lever 4. At least one coupling 25 is functionally connected to an energy-storing second damping element 24.

The mode of action is as follows. The inking roller 2 is controlled in terms of transmission technology in such a way that it bears periodically about the lifting shaft 3 in the lifting cycle, against the inking roller 1, for example an ink fountain roller, or the first inking roller 8.

In the contact position of the inking roller 2 with the inking roller 1 (FIGS. 1, 3) there is a separation point 19 between the inking roller 2 and the downstream first inking unit roller 8. The roller lever 4 and rocker arm 6 with adjusting element 5 are out of contact. At the same time, the first calender roller 10, which is in frictional engagement with the first inking roller 8, is in contact position with the downstream second inking roller 11 in order to ensure ink transport from the first inking roller 8 via the second inking roller 11 to the inking rollers 12. The inking roller 8 can be driven in a rotational movement and can preferably be executed in an oscillating manner in the axial direction.

When the inking roller 2 is in contact with the first inking roller 8 (FIGS. 2, 4), there is a separation point 20 between the inking roller 2 and the upstream inking roller 1. Before this, the inking roller 2 moves towards the first inking roller 8 and at least one of the roller levers 4 strikes a first adjusting element 5, at least one energy-storing first damping element 7 being activated and damping the impact of the inking roller 2. Synchronous to the movement of the inking roller 2, the first rocker arms 6 swing in the respective swivel joint 9 about the axis of the first inking roller 8 such that the first calender roller 10 remains in constant frictional contact with the first inking roller 8 and at the same time the ink flow to the second inking roller at a separation point 18 11 and thus to the rest of the roller train 15 and the downstream inking rollers 12. In this position, the first calender roller 10 flattens the elevator strip located on the outer surface of the driven, first inking unit roller 8 and transferred by the inking roller 2 into a uniform ink film. This takes place when the inking roller 2 is functionally connected to the first inking roller 8.

In the contact position of the inking roller 2 on the first inking roller 8 and when the separation point 18 between the first calender roller 10 and the second inking roller 11 is present, the inking roller 2 and the first calendering roller 10 make several revolutions on the at least rotating first inking roller 8 and thus equalize it the first inking roller 8 existing lifting strips.

If the inking roller 2 lifts off the first inking roller 8, the first rocking levers 6 swing - the first damping elements 7 relax - with the first calender roller 10 with constant frictional contact around the first inking roller 8 and the first calender roller 10 comes into contact with the second inking roller 11. As a result, the roller train 15 is closed and the equalized ink is transported in the direction of the inking rollers 12. Is. the first inking roller 8 in a preferred embodiment of an axially wiping inking roller, it is advantageous that the mounting for the calender rollers 10, 21 permit a preferably adjustable, axially oscillating stroke of the calender roller 10, 21. A synchronization of the control movement of the first calender roller 10 with the inking roller is not absolutely necessary. However, the leveling of the lifting strip can be achieved more quickly by synchronization.

If the lifter inking unit has a first and an additional second calender roller 10, 21, the movement of the first calender roller 10 takes place analogously to the mode of operation already described. The couplers 25 are each rigidly connected to in the rocker arms 6, so that the movement of the calender rolls 10, 21 run synchronously. The second adjusting elements 23 can be adjusted to the first adjusting elements 5 in such a way that the roller levers 4 preferably actuate the first and second rocking levers 6, 27 synchronously, so that preferably the formation of the separation points 18 between the first calender roller 10 and the second inking roller 11 and between the second calender roller 21 and the third inking roller 26 are clocked synchronously. By designing the lifter inking unit with two calender rollers 10, 21, the leveling of the lifter strip on the first inking unit roller 8 is noticeably accelerated, and this with a smaller number of inking unit rollers. If the third inking roller 26 is preferably designed as an inking roller, the second calender roller 21 can also allow a preferably adjustable, axially oscillating stroke in its bearings.

[REFERENCE LIST]

1

ink supply

2

Ink vibrator roller

3

lift shaft

4

roller lever

5

first adjustment element

6

first rocker arm

7

first damping element

8th

first inking roller

9

first swivel

10

first calender roll

11

second inking roller

12

Inking roller

13

bridge roller

14

dampening

15

drum compactor

16

inking

17

plate cylinder

18

separation point

19

separation point

20

separation point

21

second calender roll

22

second swivel

23

second adjustment element

24

second damping element

25

paddock

26

third inking roller

27

second rocker arm

Claims (9)

1. Ductor type inking unit (16) for a printing press with an ink ductor roller (2) oscillating between an ink feed roller (1) and a first drivable inking unit roller (8), at least one downstream arranged roller train (15) as well as at least one ink applicator roller (12) fitted to a plate cylinder (17), wherein, in continuous frictional contact with respect to the first inking unit roller (8), at least one first calender roller (10) is mounted adjacently in position-variable fashion and the ink transport to the roller train (15) is periodically separable between the first calender roller (10) and a downstream arranged second inking unit roller (11) of the roller train (15) at a separating position (18), wherein the first calendar roller (10) is mounted on both sides in swinging levers (6) which are swivellably mounted in each case about a rotary pivot (9) flush relative to the axis of the first inking unit roller (8), characterised in that the swinging lever (6) can be brought periodically into contact with at least one roller lever (4) of the ink ductor roller (2).
2. Ductor type inking unit according to Claim 1, characterised in that at least one swivel lever (6) is linked with a first damping element (7).
3. Ductor type inking unit according to Claim 1, characterised in that the first calendar roller (10) and the second calendar roller (21) are mounted adjacently in variable position in continuous frictional contact to the first inking unit roller (8) and that the ink transport to the roller train (15) and at least one ink applicator roller (12) between the first calendar roller (10) and the second inking unit roller (11) as well as the second calendar roller (21) and a third inking unit roller (26) are periodically separable at separating positions (18).
4. Ductor type inking unit according to Claim 3, characterised in that the first calender roller (10) is mounted on both sides in swinging levers (6) which are swivellably mounted in each case in a rotary pivot (9) flush to the axis of the first inking unit roller (8) and that the swinging levers (6) can be brought periodically into contact with at least one roller lever (4) of the ink ductor roller (2) and that the second calender roller (21) is mounted on both sides in links (25) which are connected in the rotary pivots (9) in the swivelling levers (6), wherein the links (25) are linked by gearing technology with second swinging levers (27) arranged on both sides which are mounted in each case in a second rotary pivot (22) fast with respect to the frame and that the first and second swivel levers (6, 27) can be brought periodically into contact with at least one roller lever (4).
5. Ductor type inking unit according to Claim 4, characterised in that at least one link (25) is linked with a second damping element (24).
6. Ductor type inking unit according to Claim 1, characterised in that a first adjustment element (5) is fitted to a first swivelling lever (6).
7. Ductor type inking unit according to Claim 1, characterised in that a first adjustment element (5) is fitted to a roller lever (4).
8. Ductor type inking unit according to Claim 4, characterised in that a second adjustment element (23) is fitted to a second swinging lever (27).
9. Ductor type inking unit according to Claim 4, characterised in that a second adjustment element (23) is fitted to a roller lever (4).