Device for clamping and tensioning printing plates
AssigneeMAN Roland Druckmaschinen AG
InventorsGeorg Hartung, Helmut Schild
Life of this patent
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Abstract
A clamping and tensioning rail for the trailing edge of a printing plate is mounted in the cylinder channel of a plate cylinder such that the trailing edge of the printing plate can be introduced in a simple way, without folding, into the gap between an upper and a lower clamping part. The clamping and tensioning rail is mounted pivotably about two pivot axes which are formed, for example, from stops fixed relatively to the cylinder and which interact respectively with an edge and an arcuate recess on the clamping and tensioning rail. Preferably, the clamping and tensioning rail is drawn into a completely open position by the force of a prestressed compression spring and can be pivoted against this force by an actuating shaft via lever arms and straps.
Claims18
A device for clamping and tensioning a printing plate having a leading edge and a trailing edge onto a plate cylinder of a sheet-fed rotary printing press wherein said plate cylinder includes an elongated cylinder channel having a bottom, said elongated cylinder channel being disposed longitudinally in said plate cylinder for receiving and supporting said clamping and tensioning device, said clamping and tensioning device comprising, in combination,
- a clamping and tensioning rail disposed in said cylinder channel, said clamping and tensioning rail including upper and lower clamping parts having opposed clamping faces,
- clamp actuating means for relatively moving said upper and lower parts with respect to one another to open and close a gap between said opposed clamping faces for respectively receiving and gripping said trailing edge of said printing plate therein,
- means defining a first pivot axis for pivotally supporting said clamping and tensioning rail, said first pivot axis being disposed a substantial predetermined first distance from said gap,
- means defining a second pivot axis for pivotally supporting said clamping and tensioning rail, said second pivot axis being disposed a substantially smaller second distance than said predetermined first distance from said gap,
- and actuating means for pivoting said clamping and tensioning rail successively about said first and second pivot axes toward said trailing edge of said printing plate while said gap is open to receive said trailing edge therein and for pivoting said clamping and tensioning rail in the opposite direction about said second pivot axis after said trailing edge is gripped in said gap in order to tension said printing plate on said plate cylinder.
Dependencies are inferred from the claim text.