DE3327790A1 - BOW OFFSETROTATION PRINTING MACHINE ACCORDING TO THE FIVE-CYLINDER SYSTEM - Google Patents

Description

PB 3330/1640

Sheet-fed offset rotary printing machine according to the five-cylinder system

The invention relates to a sheet-fed offset rotary printing press according to the five-cylinder system, with a to
printing sheet from a feeder taking over impression cylinder to which, seen in the transport direction of the sheet, two blanket cylinders are employed one behind the other, - the impression cylinder having twice the circumference, based on the circumference of the blanket cylinder.

A machine of this type is known from the textbook "Introduction to Offset Printing" by Wolfgang Walenski, Eggen textbook series, page 113. With this machine a
Sheet can be printed on one side with a double face print. A turning device would be required for perfecting. In addition, page 155 of the same technical book shows a sheet-fed offset printing machine for perfecting, in which a sheet to be printed is passed between two blanket cylinders, one blanket cylinder carrying a gripper system. The so-called "blanked to blanked" printing mode is used here.

The object of the invention is to provide a printing press of
the first-mentioned type in such a way that with a

If additional space is required, a sheet fed into the machine can be provided with a triple face print and an additional reverse print.

This task is accomplished by applying the features of the characterizing part of the claim solved.

A major advantage of the sheet-fed offset rotary printing press according to the invention is that the Application of a double front and back printing is possible if during each revolution of the double-sized impression cylinder, two sheets can be applied to it.

In the following, the sheet-fed offset rotary printing press according to the invention is described on the basis of exemplary embodiments, reference being made to the accompanying drawings. In this show

1 and 2 in a schematic representation

the sheet offset press according to the invention druckma sch ine.

Fig. 1 shows a printing unit 1, which comprises a so-called double-sized impression cylinder 2 on which two DiLitho printing plates 3 and 4 are attached. Below of the impression cylinder 2 is for coloring the DiLitho printing plates 3, 4 a DiLitho inking and dampening unit 5, 6-arranged. On the impression cylinder is a Blanket cylinder 7 employed to which a plate cylinder 8 assigned. Seen in the transport direction of the sheets to be printed, there is another behind the blanket cylinder 7 Blanket cylinder 9 employed against the impression cylinder 2, to which a plate cylinder 10 is assigned.

A sheet 11 coming from a conventional sheet feeder is by a conventional, not shown in detail Gripper system, which is arranged, for example, in front of the DiLitho printing plate 4, detected and guided past the two rubber cylinders 7, 9, after which the sheet transfer transfer point 12 the sheet is fed to a further printing unit or a sheet delivery, for example via a chain system.

In the angular position of the impression cylinder 1 shown in Fig. 1, this was on the offset plate 3, the

4 is a mirror image of a DiLitho plate ι copied is, located, previously inked print image advantageously transferred to the rubber cylinder J. , since no sheet is fed to the printing unit 1 while the printing plate 3 is moving past the blanket cylinder 7. Thus, the blanket cylinder j. on the one hand from the plate cylinder 8 and on the other hand from the offset plate 3, ie colored twice. The representation according to Fig. 2 shows that a sheet 11 is detected by the gripper system assigned to the printing plate 4 and on the one hand from the blanket cylinder 7 can be provided with a double straight printing and from the printing plate 4 with a reverse printing. With a further rotation of the counter pressure Linders 2 is then another imprint by the blanket cylinder 9, so that the sheet at the sheet transfer point 12 with a total of three face printing and one Reverse printing is provided.

With the printing machine according to the invention, it is also possible in an advantageous manner to use a sheet to be fed through the machine with double straight printing the blanket cylinders 7 and 9 and with a reverse print

3397790

PB 3330/1640 -Jf- °° ^L '' ^ΌΌ

to be provided with two DiLithoi plates 3 and 4, if at a sheet is fed to each revolution of the impression cylinder 2. The main advantage of the invention Printing press comes into play when only one sheet is applied during each revolution of the impression cylinder 2 is so that each by a plate, for example through the plate 3, which in this case acts quasi as an offset printing plate, a second print image on the rubber cylinder 7 can be transmitted. In this case, the three-fold straight printing (offset) mentioned at the beginning is plus a reverse printing (DiLitho) possible without the printing unit becoming much more voluminous.

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Claims (1)

PB 3330/1640 -, K- 332 // ΰU Claim: Sheet-fed offset rotary printing machine based on the five-cylinder system, with one of the sheets to be printed The impression cylinder taking over the feeder to the, in As seen in the transport direction of the sheets, two in a row Blanket cylinders are employed, and the impression cylinder twice the circumference, based on the circumference of the Rubber cylinder, characterized in that the Impression cylinder (2) is covered with two printing plates (3, 4) behind the sheet delivery point (12) by a DiLitho inking and dampening units (5, 6) can be colored and that during one revolution of the double-sized impression cylinder (2) only one sheet (11) is fed to it where one plate (e.g. 3) is an offset plate and the other (e.g. 4) is a DiLitho plate.