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US 4,002,117 AGranted
Rotary copying machine
OwnerGerhard Ritzerfeldinventor
Life of this patent
Estimating the term…
Abstract
A rotary copying machine adjustable for a full page printing respectively line printing of sheets from a printing form on a rotatable printing drum has a device for moistening the sheets to be printed, and wherein the stroke of a piston pump for supplying liquid to the moistening device is automatically adjusted depending on whether the copying machine is adjusted for printing of a full page or for printing a section, i.e., one or a plurality of lines of a page.
Claims7
A rotary copying machine comprising a rotatable printing drum carrying a printing form;
- a back pressure roller movable toward and away from the printing drum;
- means for feeding sheets to be printed between said printing drum and said back pressure roller;
- adjustable means for cyclically moving said back pressure roller during each revolution of said printing drum for selectively printing either a full page or a section of a full page of the printing form on the sheet;
- means for feeding a moistening liquid onto the sheets while they are fed between the drum and the roller and comprising a pump with a reciprocating piston;
- adjustable stop means;
- and locating means operatively connected to said adjustable means for locating said adjustable stop means in the path of said piston to limit the stroke of the latter during printing of a section of a full page and for locating said adjustable stop means out of the path of said piston during printing of a full page.
3 more elements
Dependencies are inferred from the claim text.