US2887045A - Series offset rotary printing press - Google Patents

Description

May 19, 1959 P. DIETRICH SERIES OFFSET ROTARY PRINTING PRESS Filed Feb. 8, 1955 Unite hrates SERIES OFFSET ROTARY PRINTING PRESS Paul Dietrich, Augsburg, Germany, assignor to Maschinenfabrik Augsburg-Nurnberg A.G., Augsburg, Germany, a corporation of Germany Application February 8, 1955, Serial No. 486,930

Claims priority, application Germany February 13, 1954 3 Claims. (Cl. 101-177) This invention relates to a series ofiset printing press. In particular the invention is directed to the construction of each individual printing stand so that a number of stands can be simply and effectively connected in series to make a multi-color offset rotary printing machine of any length.

Heretofore in series connected press stands, especially in photogravure printing presses, special drying drums were placed between the individual press stands. This resulted in a complicated construction which took up considerable floor space.

The object of the instant invention is to rearrange the printing rolls in each press stand, and to eliminate the conventional drying drums so that a more simplified printing press requiring less floor space can be obtained.

Each press stand includes a plate roll, an offset roll, and a printing roll, together with the conventional inking mechanism. The printing roll is heated and is twice the diameter of the offset roll. The printing roll is mounted above the offset roll, beneath which is mounted a plate roll and inking rolls. This construction makes it possible to run the printing paper from the top of one press stand to the next stand. If printing on both sides of the paper is desired, conventional reversing rods can be mounted above the press stands.

The means by which the object of the invention is obtained is described more fully with reference to the accompanying drawing, which shows a diagrammatic side elevational view of a printing press.

Press stands 1, 2, and 3 are connected in series. Each stand has a printing roll 4 mounted almost vertically above offset roll 5, the diameter of the printing roll being twice as large as offset roll 5. Beneath roll 5 is the plate roll 6, and the associated inking rolls. Printing roll 4 is internal heated by hot water and external partially enclosed by a drying hood 7, which receives hot air from a blower 8 driven by a motor 9. As the printing paper is fed to roll 4 substantially vertically beneath the axis of the roll, and is removed from the roll adjacent the bottom of the roll, the drying hood 7 extends over the top of the roll and around more than onehalf the circumference of the roll. This results in a more complete drying of the paper before it leaves the roll. Inasmuch as printing roll 4 is mounted in the upper portion of the press stand, the printing paper is removed from the upper portion of t e stand, and does not interfere with the inking rolls.

If printing on both sides of the paper is desired, conventional type reversing rods 10 can be mounted above the press stands. As shown, these rods 10 are arranged between stands 1 and 2, and, accordingly, a two-color print can be obtained in the passing of the paper through the two stands. It is apparent that the reversing rods 10 can be also placed between stands 2 and 3 so that two colors can be obtained on one side and one color on the other side of the paper. Numerous variations can be achieved by various combinations of the number of press stands and the number of reversing rods used. Otherwise the printing press only requires the conventional printing machinery such as the device 11 for feeding the paper to the press stand, and the device 12 for receiving and folding the printed sheets.

The invention has the advantage that each press stand is simple and compact, and no intermediate drying drums are needed between the individual press stands. The inking rolls are readily accessible, inasmuch as they are not obstructed by the paper. Finally, this series oiiset rotary printing press is much cheaper to produce and easier to assemble than prior known presses.

Having now described the means by which the objects of the invention are obtained, I claim:

1. An offset printing press having a plurality of series joined printing stands, each printing stand comprising a plate roll and associated inking rolls, an offset roll above said plate roll, a printing roll of about twice the diameter of said plate roll mounted almost vertically above said offset roll, means for feeding printing paper to the bottom of the printing roll and for removing the printing paper adjacent the bottom of the printing roll after traveling around the major portion of the circumference of the printing roll, means for interiorly heating said printing roll, and ink drying hood means mounted above and extending around a major portion of the circumference of said printing roll.

2. An offset printing press as in claim 1, further comprising guide means for transferring the printing paper from one printing cylinder in a path above that printing cylinder and then to an adjacent printing cylinder.

3. An oiiset printing press as in claim 2, further comprising printing paper reversing rod means mounted above and between adjacent printing rolls.

References Cited in the file of this patent UNITED STATES PATENTS 1,133,922 Brila Mar. 30, 1915 1,600,487 Roehlen Sept. 21, 1921 1,709,967 Ballou Apr. 23, 1929 1,966,287 Fischer July 10, 1934 2,024,813 Barber Dec. 17, 1935 2,088,681 Zuckertnan Aug. 3, 1937 2,242,995 Ericksson May 20, 1941 2,308,117 Snyder Jan. 12, 1943 2,768,576 Dietrich Oct. 30, 1956 FOREIGN PATENTS 300,613 Switzerland Aug. 15, 1954

Images