Abstract: Clamping device for locking a printing plate on a cylinder of a printing press includes two parallel clamping bars formed with respective clamping surfaces, at least one of the clamping bars being movable perpendicularly to the clamping surfaces, and an element for producing a clamping force between the clamping bars, a first one of the clamping bars including at least one leaf spring formed with the clamping surface of the first clamping bar, the clamping surface thereof being cooperatively clampable with the clamping surface of the second one of the clamping bars, the first clamping bar further including a member formed with at least one concave segment-shaped recess, the leaf spring being formed with a corresponding convex segment-shaped protrusion supported in the recess.