Device for regulating cylinders in a printing machine
A pressure force exerted by first and second cylinders upon at least a third cylinder in a printing machine is regulated by a pressure regulating device. The device can also be using for moving a first cylinder and at least one second cylinder into and out of contact with a third cylinder. Actuators, which exert a radial force on a cylinder cooperating with the actuators, are provided. An aperture angle between the radial forces exerted by two actuators on the same cylinder is the same in both cylinders. That aperture angle is independent of an aperture angle formed by the pressure force exerted by the first and second cylinders on the third cylinder.
1. A device for setting a contact pressure exerted by a first roller and a second roller on at least a third roller and for engagement and disengagement of said first and second roller with said at least third roller in a printing press comprising:
at least first and second actuators in each of said first and second rollers;
means for operating said at least first and second actuators in each of said first and second rollers for each said actuator exerting a radial force directed onto said third roller in operative contact with each said first and second rollers;
a first opening angle determined by said radial forces directed by said at least first and second actuators in each said first and second roller;
a vector sum of said radial forces of each said first and second roller, each said vector sum exerting a contact pressure on said third roller;
roller holders supporting each of said first and second rollers; and
frame holders supporting said roller holders, each said frame holder including a housing, said housing receiving said actuators for said associated roller.
2. The device of claim 1 further including a control signal for actuating said actuators to each exert said radial force.
3. The device of claim 1 wherein said opening angle is between 45° and 135°.
4. The device of claim 1 wherein said actuators are positioned between said roller holder and said frame holder.
5. The device of claim 1 wherein said housing is embodied as at least a half shell.
6. The device of claim 1 wherein each of said actuators is a hollow body adapted to be charged with a pressure medium.
7. The device of claim 6 wherein each said hollow body can be pneumatically actuated.
8. The device of claim 6 wherein each said hollow body includes an elastomeric material.
9. The device of claim 1 wherein said first roller and said second roller are rollers of one of an inking unit and a dampening unit.
10. The device of claim 1 wherein at least one of said rollers cooperates with a forme cylinder.
11. The device of claim 10 wherein each of said rollers which are engageable with said forme cylinder can be set and engaged and disengaged.
12. The device of claim 1 wherein said first opening angle is the same for each of said first roller and said second roller.
13. The device of claim 1 further including a second opening angle defined by said first roller radial force against said third roller, and by said second roller radial force against said third roller.
14. The device of claim 13 wherein said first opening angle and said second opening angle are not equal.