DE1048597B - Rotary letterpress machine for perfecting printing - Google Patents

Description

Recently there has been a growing desire to use a rotary printing press !! usual design too To be able to produce daily newspapers or the like that contain multi-colored pages with several bright colors. In particular, four-color printing is thought of, which is astonishing on ordinary newsprint effective images. Therefore, large machines with many printing units are often already from House made with a corresponding number of special color printing units as well as reversible ones Equipped printing units and so provided for a multicolored design of newspapers. Such systems are only suitable for very large editions, which regularly print multicolored images contain. In many places, however, Xun is only supposed to use multi-color printing occasionally and on special occasions can be used so that a distinctly multicolor machine would be too expensive. In such Cases can be avoided, for example, with 32-page rotary presses with two back units in such a way that the paper web is printed from only one roll runs through both printing units. It is accepted that the two printing units Produce a maximum of 16 pages of newspapers. However, this type of production either requires an imprinting unit each in each of the two printing units or an imprinting unit and a reversal of the direction of rotation in the Printing unit for color printing. In addition, this way out generally requires long detours the paper web over the folders.

It has also been known to produce multicolor printing with a single printing unit. For this purpose, it has been proposed to use a pony printing unit, in which a half-width paper web is fed back to this printing unit laterally offset via Leitstaiigen after the face printing has taken place, and to equip it with two forme cylinders resting on the printing cylinder. This arrangement made it possible to print a maximum of 8 pages of newspaper on both sides with two colors with the help of ponvite bars. In addition, for the production of four-color prints it was planned to exchange the reversible bars for two toilet bars lying parallel to one another. By arranging the two turning bars in parallel or at right angles to one another, either two or four color printing could be produced, ie printing with colors on both sides or with four colors on one side. But especially with the four-color printing that is so coveted today, paper webs were only printed on one side. This arrangement therefore does not offer any possibility of meeting today's requirements in newspaper printing. Such a printing unit is also not suitable for an optional rotary letterpress press
for perfecting

Applicant:
Schnellpressenfabrik Koenig & Bauer

Corporation,
Würzburg 7, Friedrich-Koenig-Str. 4th

Gregor Muth, Zell / M. via Würzburg,
has been named as the inventor

Processing of very wide webs that are to be printed on both sides. Furthermore there is a respective one It is necessary to change the turning bars.

The use of pony printing units on machines with several has also been known for a long time ordinary printing units. In a known example of this type, the machine has two normal ones Printing units with a folder and a special independent printing unit with a own printing cylinder. This additional printing unit can either be used as a pony printing unit or work as a printing unit for full-width taps. In the latter case, the direction of rotation becomes one the printing units of the associated printing unit reversed, and the Ponywendestangeii remain unused, so that the associated paper web three printing units one after the other on their way to the folder and printed on one side either with a thick text or in two colors can be. In the other case, however, the additional printing unit from the pony printing unit is used on both sides Printing of your own, half-width paper web, which only Schwaizdruek receives and afterwards Schöndruck over the Ponywendestangeii again this printing unit is fed before it to Folder is running. In this way one can indeed have a newspaper with increased or with particularly graduated Page number, but do not produce a four-color print.

(In addition to the known arrangements, the invention relates to a rotary letterpress printing machine in which a printing unit for front and back printing of a maximum of 16 pages of newspaper, an impression unit for reverse printing and a pair
has horizontal turning bars.

parallel to each other

Claims (1)

According to the invention, such a printing unit that is suitable for producing 16-page newspapers is used in such a way that when processing a half-width roll of paper, the after finishing and Reverse printing from the turning bars laterally offset running half-width paper web not, as for the Production of loose newspapers is common, sent directly to the folder, but beforehand in itself known way is again passed through the reverse printing unit of the printing unit to on its reverse printing side to get another two-color print. The paper web printed on both sides can therefore either directly to the folder or through the reverse printing unit beforehand will. In this way, 8-page newspapers with four-color printing can also be printed with just one printing unit on the reverse side. The invention makes it possible, by an unusually simple measure, to work with anyone with an imprinting unit equipped four plate wide printing unit of common design for the production of 16-sided Newspapers can also produce 8-page newspapers with four-color printing on the reverse side. The corresponding paper web guide only requires a few additional paper guide rollers. she can This means that they can easily be retrofitted even with existing systems. It is neither a reversal of the direction of rotation of printing units nor an exchange or turning over of turning bars necessary. Furthermore, the possibility already opens up for the owner of a single printing unit for the production of newspapers with four-color pictures. In addition, the new arrangement is also on Machines with several printing units can be used advantageously because one printing unit already has four-color printing results and all the rest remain available for printing full-width webs. Therefore, for example a machine for a maximum of 32 pages of newspaper with two printing units and one imprinting unit In one printing unit, even with four-color printing, up to 24 pages of newspaper compared to before 16 pages result. The drawing illustrates in schematic Representation of an embodiment of the invention, namely Fig. 1 shows a printing unit, Fig. 2 the paper guide over the turning bars with the usual perfecting and reverse printing Fig. 3 the paper guide over the turning bars for perfecting with three bright colors in reverse. The four plate wide printing unit includes the straight printing unit with its printing and forme cylinders 1 and 2 as well as the reverse printing unit with the impression and forme cylinders 3 and 4. The impression cylinder 3 is also assigned an imprinting unit with a forme cylinder 5. Located above the printing units the turning bars 6, 7 with their paper guide rollers 8, 9 and the cutting knife 10 for the Longitudinal section of the full width web. The paper web coming from the paper roll first runs through the front and back printing units, so that both sides receive the black print and the reverse print side receive a color print. In the When producing 16 pages of newspaper, the web 11 is full-width. Their lengthways cut is made on the paper guide roller 8 in front of the turning bars. The front strand half 12 (Fig. 2) runs easily over the guide roller 13 to the folding unit. The rear half of the strand 14 moves over the turning bars 6, 7 and the paper guide rollers 9, 15, so that on their way to the folding unit they work with the other half of the strand 12 flees. When the printing unit is switched to multi-color printing, the ones on the front and the rear half of the two forme cylinders for the printing plates lying different in pairs colored. The forme cylinders 2 and 4 are half, i.e. H. in the back of a two plates wide zone fed with black paint. The forme cylinder 5 of the imprinting unit receives on both Halves different, each one a bright color. The forme cylinder 4 is at the front, i.e. two plates wide, another bright color added. The paper web 16 is half-wide. She gets through first the perfecting and reverse printing units 1 to 5 print black on both sides and print in color on the reverse side. Then it is turned forward by the turning bars 6, 7 (Fig. 3) and passed over the guide rollers 9, 15, 17, 18 again to the perfecting unit, to there through the Form cylinder 4, 5 printed with two other bright colors and then over the guide rollers 19, 20, 13 to be guided to the folding unit. This means that half of the 8-page newspaper is printed in four colors. P Λ Τ Κ Ν Τ Λ. PROPOSAL: Rotary printing press with a printing unit for perfecting of a maximum of 16 pages of newspaper, one imprint unit for reverse printing and a pair parallel to each other has lying turning bars, characterized in that the after done beautiful and Again, as in the production of loose-page newspapers, from the turning bars (6, 7) running half-width paper web (16) is not passed directly to the folder, but beforehand in a manner known per se again through the reverse printing unit (3 to 5) of the printing unit (1 to 5) is carried out, so that S-sided newspapers with four-color printing on the reverse printing pages to manufacture. Considered publications:
German patent specifications No. 187 759, 434 442. 1 sheet of drawings 809 729/3 1.59