DE4420672A1 - Moisture distribution roll for dampening appts. of printing press - Google Patents

Abstract

The roll can be brought into contact with the pressure plate of a printing form cylinder (5) and a dosing roll. The setting point (8) of the turning lever (7) is on the elongated connecting line between the middle points (10,11) of the axes of the dosing roll and the moisture distribution roll in position against the printing form (4) of the printing form cylinder. The setting point of the lever may be on the extended connecting line of the axis middle points in the direction of the printing form cylinder. The connecting line intersects with the theoretical extension of the circumferential line of the printing form cylinder in the axial direction of the pressure form cylinder.

Description

The invention relates to a dampening roller for applying moisture works of a printing press.

Dampening units are known (DD 1 39 816), which consist of a in a trough with a dipping roller rotating around the dampening liquid, a downstream metering roller and one with the metering roller and with the printing form of the printing form cylinder in effect connected dampening roller. The damp application roller is also over a bridge roller with a Ink application roller connected to an inking unit.

The dampening roller can be removed from the printing form cylinder and mounted for this purpose in a swivel lever, whereby the parking movement almost radial to the printing form cylinder follows.

The disadvantage here is that the implementation of the necessary different operating variants, such as

• - Position the dampening roller on the metering roller with subsequent placement of the dampening roller on the Printing form cylinder while maintaining contact with Dosing roller
• - The dampening roller is switched off from the printing form cylinder and from the metering roller
• - The dampening roller is switched off from the printing form cylinder while maintaining contact with the metering roller

is not possible as a whole.

Furthermore, an independent pressure setting for Printing form cylinder and a system of the dampening roller to the printing form cylinder across the entire width at an angle position of the printing form cylinder cannot be realized.

The object of the invention is to create a damp application roller, which with simple technical means in all switching positions necessary for printing technology can be switched.

According to the invention the task is characterized by the Claim resolved.

The invention is illustrated below using an exemplary embodiment described in more detail.

The drawing shows a dampening system of a printing press.

The dampening system shown in the drawing consists of egg ner in a trough 1 with dampening liquid circulating immersion roller 2 , one of the immersion roller 2 downstream metering roller 3 and one with the printing form 4 of the printing form cylinder 5 and the metering roller 3 in active connection dampening roller 6th The dampening roller 6 is mounted in a pivot lever 7 . The frame point 8 of the pivot lever 7 is on or almost on the connecting line 9 of the axis centers 10 ; 11 of the metering roller 3 and the dampening roller 6 arranged. The actuating element 12, which is supported in the machine frame, is arranged on the pivot lever 7 .

Preferably, the frame point 8 of the pivot lever 7 is arranged on or almost on the connecting line 9 extended in the direction of the printing form cylinder 5 . In this case, the imaginary connecting line 9 and the axially thought extension of the circumferential line of the printing form cylinder 5 intersect. Preferably, the frame point 8 is within the intended in the axial direction extension of the circumferential line of the plate cylinder 5th

To ensure a quick shutdown of the dampening roller 6 from the printing form cylinder 5 with a simultaneous brief increase in the contact pressure of the dampening roller 6 to the metering roller 3 , the frame point 8 is slightly shifted in the direction of movement of the dampening roller, that is, it is almost on the connecting line 9 (in the drawing moved frame point marked with 8 ′).

The pivot lever 7 is supported with a roller 13 against a curve 14 fastened on the printing form cylinder 5 . The Rol le 13 is mounted eccentrically in the pivot lever 7 . It can be rotated via worm wheel 15 , worm 16 , shaft joint 17 with adjusting spindle 18 fixed to the frame. This serves to adjust the pressure of the dampening roller 6 for the printing form cylinder 5 .

The mode of operation of the invention is described below Moist application roller described.

When the control element 12 is activated, the dampening roller 6 is switched off while maintaining contact with the metering roller 3 from the printing form 4 of the printing form cylinder 5 , with further activation of the control element 12 , the dampening roller 6 is also separated from the metering roller 3 .

When the printing form cylinder 5 is tilted, the dampening roller 6 is again set parallel to the printing form cylinder 5 via the cure 14 , the roller 13 and the pivot lever 7 . The arrangement of the frame point 8 of the pivot lever 7 and the axis centers 10 and 11 of the dampening roller 6 and the metering roller results in no significant change in pressure between the dampening roller 6 and the metering roller 3 .

With the arrangement of the dampening roller according to the invention are all procedural requirements without great effort can be met.

Reference list

1 trough
2 dipping roller
3 metering roller
4 printing form
5 printing form cylinders
6 dampening roller
7 swivel levers
8 rack point
8 ′ shifted frame point
9 connecting line
10 axis center of the metering roller
11 Axis center of the dampening roller
12 control element
13 roll
14 curve
15 worm wheel
16 snail
17 shaft joint
18 adjusting spindle

Claims (5)

1. dampening roller of a dampening unit of a printing press, which is mounted in a swivel lever which can be actuated via an adjusting element and can be brought into active connection with the pressure plate of a printing form cylinder and with the metering roller of the dampening unit, characterized in that the frame point ( 8 ) of the swivel lever ( 7 ) on the extended connecting line ( 9 ) of the axis centers ( 10 ; 11 ) of the metering roller ( 3 ) and the dampening roller ( 6 ) placed on the printing form ( 4 ) of the printing form cylinder ( 5 ). 2. dampening roller of a dampening unit according to claim 1, characterized in that the frame point ( 8 ) of the pivot lever ( 7 ) on the in the direction of the Druckformzylin ders ( 5 ) extended connecting line ( 9 ) of the axle center points ( 10 ; 11 ) is arranged. 3. dampening roller of a dampening unit according to claim 1, characterized in that the connecting line ( 9 ) and in the axial direction of the printing form cylinder ( 5 ) thought te extension of the circumferential line of the printing form cylinder intersect. 4. dampening roller of a dampening unit according to claim 1, characterized in that the frame point ( 8 ) of the pivot lever ( 7 ) within the imaginary extension of the circumferential line of the printing form cylinder ( 5 ) is arranged in the axial direction. 5. dampening roller of a dampening unit according to claim 1, characterized in that the frame point ( 8 ) of the pivot lever ( 7 ) is arranged almost on the connecting line ( 9 ).