Printing – Flexible-sheet-securing devices
Patent
1996-07-18
1998-03-31
Burr, Edgar S.
Printing
Flexible-sheet-securing devices
B41F 128
Patent
active
057326290
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an arrangement for retaining first and second beveled edges or ends of a sheet-shaped flexible support, such as an offset printing plate, in an insertion slit of a cylinder of a rotary printing press.
DESCRIPTION OF THE PRIOR ART
A prior art device which is usable for clamping a flexible printing plate on a cylinder of a rotary printing press has become known from DE 40 05 093 C1, wherein an eccentrically seated clamping spindle extends in an axis-parallel direction in a cylinder well of a printing cylinder. Two ends of a printing plate are clamped together between a wall of the cylinder well and the clamping spindle when the clamping spindle is rotated and thus presses the ends of the printing plate into a circular arc-shaped section of the cylinder well.
It is disadvantageous in connection with this prior art clamping device that the ends of the printing plates have permanent deformations because of being pressed into the circular arc-shaped section of the cylinder well. These deformations are an obstacle to the multiple use of the printing plates. Furthermore, the deformed ends are difficult to remove from the circular arc-shaped section of the cylinder well, since they adhere in a bead-like manner to this section.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a device for retaining the bent edges of a sheet-shaped support, for example a flexible printing plate, on a cylinder, by means of which the sheet-shaped support can be rapidly exchanged and its ends can be held without damage.
This object is attained in accordance with the invention by utilizing a printing plate support cylinder that is provided with an axially extending plate end receiving insertion slit. An axially extending hole or bore is situated adjacent the insertion slit. An inflatable hose is situated in this hole or bore. When the inflatable hose is provided with a pressurized fluid, it engaged the plate ends that have been inserted in the slit and holds them against a wall of the slit opposite the hose.
The following advantages are realized by means of the present invention: only the cutting of an axial bore in the vicinity of the surface of the printing cylinder is required for receiving the clamping device for the printing plate. The beveled edges of the printing plates are fed to the clamping device only by means of a slit extending tangentially in respect to the cross section of the axial bore. In the process, both ends of the printing plate lie on top of each other, so that the slit in the printing cylinder can be kept narrow on the one hand and, on the other, no ink can penetrate between both plate ends and so-called "conduit shocks" of the printing cylinder are prevented to the greatest extent. Furthermore, those means which make a rapid removal of the printing plate possible, wherein the beveled or bent edges of the printing plate are still undamaged following clamping or retaining and are not deformed, are used for retaining the plate ends. It is also possible to hold printing blankets on cylinders by means of this device.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be explained in more detail below by means of an exemplary embodiment. The sole drawing FIGURE shows a cross section through a preferred embodiment of a device in accordance with the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A printing cylinder 1 is provided with an axis-parallel hole or bore 3, extending in an axis-parallel direction in the vicinity of the surface 2 of cylinder 1 and with bore 3 having a generally circular cross section, for example in the shape of a segment of a circle. A straight slit 4 , which is a plate end insertion slit of a preferably rectangular cross section about a central axis 6 which is inclined at an angle .alpha. with respect to a tangent line T which is tangent with the surface 2 of cylinder 1 at the point where slit 4 intersects cylinder surface 2, extends from the surface 2 of the printing cylinder 1 in a plane alo
REFERENCES:
patent: 2204928 (1940-06-01), Culver
patent: 3058417 (1962-10-01), Norlin
patent: 3456588 (1969-07-01), Brodie
patent: 3715981 (1973-02-01), Huffman
patent: 4522068 (1985-06-01), Bernauer et al.
patent: 5062363 (1991-11-01), Reichel
patent: 5402722 (1995-04-01), Schneider
Puschnerat Helmut
Schroder Peter
Burr Edgar S.
Grohusky Leslie
Koenig & Bauer--Albert Aktiengesellschaft
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