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Modern offset lithography printing presses use an updated version of the same basic idea in which the stone is replaced with a thin metal printing plate. First, the image to be printed is transferred photographically to the plate. The parts of the plate from which the image is printed are coated with lacquer (clear varnish), so they attract ink, while the rest of the plate is coated with gum, so it attracts water. The metal plates are curved around a printing cylinder and press against a series of rollers, which dampen them with water and then brush them with ink. Only the lacquered parts of the plate (those that will print) pick up ink. The inked plate presses against a soft rubber (offset) cylinder, known as the blanket cylinder, and transfers its image across.
Explanation: I'm providing an answer here because the discussion box isn't the right place to do it, but because I'm basing my suggestion on the reference I provided in the discussion, I'm posting with a low confidence level.
The blanket cylinder is moveable, in that it can be brought in and out of contact with the plate cylinder and impression cylinder. However, since the gears of each of these cylinders need to remain in contact, the blanket cylinder cannot be moved very far. This backing away of the blanket is necessary so as to allow the mounting and washing of plates without dirtying the blanket, or to allow the mounting and washing of the blanket without dirtying the plate or plate cylinder. The distance between the blanket and the impression cylinder is adjustable, so as to allow printing on a wide variety of substrate thicknesses.
Explanation: If "rodillo tocador" is a roller that's always in contact,
I think "contact roller" could be a good choice here.
I was unable to find any references or definitions of "contact rollers", though.
Giovanni Rengifo Colombia Local time: 09:06 Specializes in field Native speaker of: Spanish PRO pts in category: 114