Bearings – Rotary bearing – Plain bearing
Patent
1992-09-22
1993-11-02
Hannon, Thomas R.
Bearings
Rotary bearing
Plain bearing
384583, 384616, F16C 2300, F16C 2306
Patent
active
052578666
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention refers to a bearing device for a linear adjusting device, preferably a side register or side lay of a cylinder, preferably a plate cylinder of a printing press.
A printing press comprises several plate cylinders onto which curved printing plates are mounted. It is important that all printing plates have the same orientation so that the pictures imprinted by the printing plates on a running paper web lie in a straight line behind each other. If a printing plate on a plate cylinder has an oblique position in relation to a printing plate on another plate cylinder, the first-mentioned plate cylinder may be tilted, so-called cocking adjustment, to eliminate the tilting of the printing plate.
In a printing press it is also desirable to adjust the plate cylinder in the axial direction, so-called side adjustment, to cause the printed pictures to lie exactly in line with each other. Here it is a question of small axial movements of an order of magnitude of centesimals of a millimeter.
In a printing press it may also be necessary to shift a plate cylinder in a direction at right angles to its longitudinal axis, so-called impression on/off adjustment. Such shifting movement is performed, for example, when it is intended to change from printing to non-printing. In the non-printing position it is for example possible to mount the printing plates on the plate cylinder.
STATE OF THE ART
In order to perform lateral adjustment of the plate cylinder a so-called side register or side lay is used at present. In order to perform the cocking adjustment a supple shaft inserted between the side register and the journal of the plate cylinder is used. The supple shaft permits inclination of the plate cylinder due to the flexibility of the supple shaft. However, there is a problem due to the fact that the supple shaft also is suppled axially and thus produces undesirable lateral shifting of the plate cylinder.
Rather than using a supple shaft, a bulky cylindrical shaft may be used provided with cardan joints, one at each end.
However, both the supple shaft and the bulky shaft provided with cardan joints lack satisfactory axial stiffness. As mentioned above, an adjustment exactitude of one centesimal of a millimeter is required, taking into consideration that the plate cylinders are large and heavy and expose the bearings, side registers and intermediate shafts to very large dynamic forces.
REVIEW OF THE INVENTION
It is the purpose of the invention to bring about an axially very stiff transmission between the plate cylinder and the side register. The device according to the invention is intended to permit both cocking adjustment and impression on/off adjustment of the plate cylinder while maintaining the mentioned high stiffness requirement in connection with the lateral adjustment of the plate cylinder by means of the side register.
The features characterizing the invention appear from the attached claims.
No refractive forces should be introduced into the axial bearings of the side register.
DESCRIPTION OF THE DRAWINGS
The invention will be described in detail hereafter by reference to the attached drawings in which
FIG. 1 is perspective view of a pair of cylinders where one of the cylinders, the plate cylinder, at its one end is connected to a side register, the plate cylinder being in the adjustment position "impression-off",
FIG. 2 is an enlarged perspective view of the device according to FIG. 1,
FIG. 3 shows the pair of cylinders according to FIG. 1 when the plate cylinder is inclined (=cocking-adjustment),
FIG. 4 is a perspective view at an enlarged scale of the device according to FIG. 3,
FIG. 5 is a cross-sectional view of the device according to the invention,
FIG. 6 is a plane view along the line VI--VI in FIG. 5 and
FIG. 7 is a view in longitudinal section of the side register shown in FIGS. 1-5.
DESCRIPTION OF A PREFERRED EMBODIMENT
FIG. 1 represents a cylinder stand comprising two side walls 1, 2. A plate cylinder 3 and a rubber cylinder 4 form a pair of cylinders which is sup
REFERENCES:
patent: 1839497 (1932-01-01), Peterson
patent: 1910857 (1933-05-01), Pizzini
patent: 2326180 (1943-08-01), Stempel
patent: 2581455 (1952-01-01), Stempel
patent: 3331318 (1967-07-01), Augustyn et al.
patent: 3545827 (1970-12-01), McDermott
patent: 4760789 (1988-08-01), Witczak
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