Dampening roller

Details Dampening roller Dampening roller

1999-10-06

2001-09-25

Hilten, John S. (Department: 2854)

Printing

Planographic

Dampeners

C101S147000

Reexamination Certificate

active

06293191

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a dampening roller for a dampening unit of a rotary offset printing press.
DESCRIPTION OF THE PRIOR ART
A dampening agent application roller having an elastic covering, and which can be driven by a plate cylinder by means of a frictional connection, is known from DE-OS 14 36 542. On its circumference, this dampening agent application roller has abutments at both ends. These abutments are arranged in a ring shape and are in rotatable contact with ring-shaped supports arranged on the circumference of the plate cylinder on both ends.
With this drive, it is disadvantageous that both the rings of the abutment and the elastic covering of the driven dampening agent application roller are made of different materials. It is furthermore disadvantageous that, because of the clamped-on printing plates, the ring-shaped supports located at the ends of the plate cylinder have a larger diameter in comparison to the plate cylinder and are also made of a different material.
U.S. Pat. No. 5,191,835 describes a dampening unit for a rotary printing press with the dampening unit having four dampening rollers. A dampening agent application roller, which works directly together with the printing cylinder, is frictionally driven, while the dampening rollers, which are connected upstream of this dampening agent application roller, are driven in an interlocking manner by means of gear wheels.
DE-AS 17 61 245 and U.S. Pat. No. 5,033,376, respectively each disclose a damping roller, whose end is provided with a drive ring. The drive ring and the barrel of the dampening roller have the same diameter.
U.S. Pat. No. 5,222,434, describes an ink and dampening agent roller which has spindle-like grooves for transporting ink, or respectively dampening agent.
SUMMARY OF THE INVENTION
The object of the present invention is based on providing a dampening roller which can be frictionally driven by a roller located at any arbitrary position in the dampening unit.
In accordance with the present invention, this object is attained by, providing a dampening roller in which at least one end of the roller is provided with at least one drive ring. This drive ring, and a barrel portion of the dampening roller have the same diameter. The dampening roller has a rubber-elastic coating and the drive ring is defined by an annular groove which is cut into the coating.
The advantages which can be achieved by the present invention particularly lie in that the dampening roller has a uniform elastic covering over its entire surface, and in which covering drive rings can be formed in a cost-effective manner at both ends by means of a “recess”. Therefore, no additional abutments are needed. The dampening roller can be placed with its drive rings against any roller of the dampening unit provided with a hard surface, and can be driven by it, without additional supports being required for this. The dampening roller of the present invention can be particularly advantageously placed against a reciprocating, driven dampening distribution roller, i.e. a distribution roller which is moving back and forth in the axial direction.
It is and advantageous that, with the same diameters of barrels and drive rings, the same roll-off proportions, i.e. the same circumferential speeds, can be achieved.
In accordance with an advantageous variation of the present invention, the drive rings have a profile, which carries dampening agent away. This is used, in particular, if a reciprocating chromium roller is arranged upstream of the dampening agent application rollers in the dampening path. In this way, along with satisfactory friction of the dampening agent application roller, an even application of dampening agent over the width of the dampening agent application roller which conducts dampening agent is provided by means of the drive rings.


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patent: 2634555 (1944-11-01), None
patent: OS 1436542 (1964-12-01), None
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patent: AS 2007554 (1970-02-01), None
patent: 62913 (1944-11-01), None
patent: 25113181 (1981-09-01), None

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