Four-ring eccentric bearing for printing-machine cylinders

Details Four-ring eccentric bearing for printing-machine cylinders Four-ring eccentric bearing for printing-machine cylinders

1999-06-24

2000-10-17

Hannon, Thomas R.

Bearings

Rotary bearing

Antifriction bearing

384447, F16C 1908, F16C 2310

Patent

active

061320986

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

Four-ring eccentric bearings of this kind are known from DE-OS-14 00 319. There, relative motions are possible around and between two eccentric middle rings, which are desirable for installing and removing the cylinders, where the middle rings can be adjusted from the outside, e.g. by swivel arms. In this case, it is unfavorable that one bearing is constructed as a sliding bearing that must have a high radial play, which results in poor printing quality. Also, in the case a movable bearing is installed, it is inserted from the outside. This is associated with overcoming high friction, since during axial shifts of the outer box, which only swivels, in the case, which stays still, sliding occurs at a very low speed.


SUMMARY OF THE INVENTION

It is therefore the task of the invention to provide a four-ring eccentric bearing that does not have these disadvantages and that, in particular, permits a precise positioning of the rollers under favorable conditions of oscillation and rotation.
The solution of this task is to provide: a four-ring eccentric bearing which includes a two-double-ring ball bearings in an "X" or "O" arrangement radially on the outside of the movable bearing side; a double-row cylinder bearing or a needle bearing as an innermost bearing and three-double-ring ball bearings on the fixed bearing side in an "X" or "O" arrangement.
By having the two rows of bearings of the movable bearing each consist of two rows of ball bearings, which, moreover, only lead to oscillating motions, a pre-positioning of this bearing is possible, which leads to high precision in guiding. Since the inner row of bearings is constructed as a double-row cylindrical roller bearing or needle bearing, the result here in the case of an axial shift is a favorable movable-bearing effect. Specifically, the normal rotating motions occur here, so that the axial shift occurs when the cylinder is rolled off, which has the effect of very low friction.
At the fixed bearing, all three rows of bearings consist of double-row ball bearings, which makes possible a defined initial axial tension and thereby also an initial radial tension.
The initial tension desired in each case can be achieved most simply by providing an intermediate ring between the ring parts of the outer ring, which is in two parts, and by adapting the ring parts of the adjacent middle ring, which is also in two parts to each other by their inner end faces. Further, the setting of the initial tension is simplified by the inner double-row cylinder roller bearing being arranged opposite to the inner ring, which is in one part, and the inner ring, which is in two parts, being provided with an intermediate ring. In order that this initial tension cannot change later, the middle rings are in two parts with connecting screws arranged in axial holes thereof. The assembly personnel, who are often inexperienced, can then no longer change the resulting component, which is easily accessible. Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.
The invention will be explained by means of the single drawing which shows a longitudinal section through a four-ring eccentric bearing illustrating certain principles of the invention, whereby the upper part is constructed as a movable bearing and the lower part as a fixed bearing.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Four-ring eccentric bearings are needed in providing bearings for installation and removal of printing-machine cylinders; and, as is known, they must consist of a movable and a fixed bearing for each cylinder. The movable bearing shown in the upper part of the drawing consists in this case of an outer ring 1, an outer middle ring 2, an inner middle ring 3, and an inner ring 4, whereby the middle rings 2 and 3 have running surfaces that are eccentric with respect to each other. The result in this case is three pairs of surfaces 5, 6, 7 that can rotate with respect to ea

REFERENCES:
patent: 4834560 (1989-05-01), Jacob et al.
patent: 5234270 (1993-08-01), Mathes
patent: 5632560 (1997-05-01), Dittenhofer

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