Printing – Inkers – Roller
Patent
1991-06-04
1993-07-20
Burr, Edgar S.
Printing
Inkers
Roller
101DIG38, B41F 1300
Patent
active
052283895
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an oscillating form roller in the inking mechanism of a printing press, the form roller including a roller shaft that is rotatably supported in bearings on both sides and a roller casing which is held at the shaft by way of bearings so as to be rotatable and axially displaceable relative to the shaft, with stops to limit the axial movement of the roller casing being fastened to the shaft in a manner secured against rotation. By way of a distributor roller in contact with the roller casing, the latter can be driven into rotation and axially displaced.
Oscillating form rollers operating according to this principle have been known for a long time. As an example of a more recent development, reference is made to European Patent No. 143,240. This reference discloses a specific configuration of such an oscillating form roller, with the axial displacement of the roller casing being effected against springs. The stops are here disposed within the roller casing. This construction is relatively expensive, particularly because of the two springs and their stops. An even greater drawback is that high quality bearings must be employed there between the roller shaft and the roller casing because these bearings must permit not only the axial displacement of the casing relative to the shaft, but must also absorb differences in the rates of rotation between the roller shaft and the roller casing ranging from zero to the maximum number of revolutions of the roller casing. Thus, two bearing systems are provided in the interior of the form roller, namely a pin bearing system and a ball bearing system. However, both bearing systems are only difficultly accessible for maintenance, which is a further drawback of this prior art system.
SUMMARY OF THE INVENTION
The invention avoids these drawbacks. It has as its object to propose an oscillating form roller having the above mentioned features which is distinguished, in particular, by a noticeable structural improvement. In particular, it should be possible to employ bearings between the shaft and the casing which can be produced economically and need meet only low requirements with respect to maintenance, even over long periods of operation.
To solve this problem, the invention is characterized in that the stops in the form of set collars are fastened to the roller shaft outside of the roller casing and have friction surfaces at their interior faces oriented toward the form roller. These friction faces cooperate with counter-friction faces at the end faces of the roller casing in such a manner that, if one of the counter-friction faces of the roller casing lies against the oppositely disposed friction face of the associated set collar, the roller shaft is driven into rotation by the driven roller casing.
By these simple measures, a synchronous or practically synchronous drive is realized between the roller casing and the roller shaft, so that the bearing between these two components, in operation, practically need only take care of the axial displaceability of the casing relative to the shaft; practically no or only very slight differences in the rates of rotation occur between these two components during operation.
The oppositely disposed faces of the set collars and of the roller casing need not be provided with special friction coatings, although this is certainly possible if a particularly high friction force is to be transmitted. Generally it will suffice if these components (set collars, on the one hand, and roller casing, on the other hand) contact one another with their conventionally worked, metal surfaces because even then sufficient friction force is transmitted between these two components to carry the shaft along in synchronism or practically in synchronism with the casing.
It is preferred to have the set collars continuously variable and clampable on the roller shaft, since this then sets the axial stroke of the form roller correspondingly, namely in dependence on the axial stroke of the distributor roller lying
REFERENCES:
patent: 4513663 (1985-04-01), Hummel et al.
patent: 4546701 (1985-10-01), Junghams
patent: 4739703 (1988-04-01), Eguchi
patent: 4829645 (1989-05-01), Kannwischer
patent: 4887533 (1989-12-01), Lemaster et al.
patent: 4953462 (1990-09-01), Krober
patent: 5062362 (1991-11-01), Kemp
patent: 5065676 (1991-11-01), Hardin
patent: 5107761 (1992-04-01), Greive
Burr Edgar S.
Hendrickson Lynn D.
Man Miller Druckmaschinen GmbH
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