Koenig & Bauer-aktiengesellschaft

Hans B Bolza-Schunemann

Heinrich K Grosshauser

A rotary printing machine has first and second printing couples for accomplishing recto and verso printing of a web. Each printing couple includes an inking unit, a plate cylinder and an impression cylinder. Each of these impression cylinders may selectively be provided with a soft or a hard cover depending on the type of printing plate secured to the plate cylinder and the type of printing ink used.

Impression cylinder surface for perfecting press

A brake assembly for stopping moving sheet stacks on a folding table of a rotary printing press and a method of operating the brake assembly is disclosed. A rotatable drum carries a plurality of axially extending stop rods spaced about the periphery of the drum. Each of these stop rods is carried on bearing arms that are spring biased. Each moving sheet stack contacts a stop rod which absorbs the energy of the moving sheet stack and causes it to stop on the folding table. The drum rotates in an intermittent fashion to bring a different stop bar into engagement with each succeeding sheet stack. A gear drive assembly for the brake assembly is also disclosed.

Brake for sheet stacks on a folding table

A method and apparatus for folding sheet stacks in a web-fed rotary printing press is disclosed. The sheet stacks are severed from groups of paper ribbons and are conveyed by suitable conveying cylinders to spaced folding tables. Each folding table is provided with rotating folding blades and cooperating driving folding roller pairs. Each folding table is further provided with a pulse absorber assembly having a plurality of stop rods or bars which are positioned to contact the leading edge of each group of sheet stacks to halt the motion of the stacks on the folding tables. The halted sheet stacks are then folded. A suitable drive assembly for the pulse absorber is also disclosed.

Folder for a web-fed rotary printing press

A gear folder for folding paper webs or sheets is provided with a cutting knife cylinder, a counter-cut groove cylinder, and a collecting and folding blade cylinder. The collecting cylinder has an odd number of fields for receipt of sheets and further includes an internal folding blade carrier having an even number of folding blades which selectively project through the periphery of the collecting cylinder to transfer a web to suitable folding rollers. Each of the fields of the collecting cylinder is provided with a pin set to retain the web on the periphery of the cylinder. The pin sets are controlled to selectively retract in conjunction with the projection of the folding blades to allow transfer of a selected sheet or stack of sheets to the folding rollers. The frequency of retraction of the pin sets and projection of the folding blades can be varied to transfer the sheets to the folding rollers after each revolution or only after several revolutions of the collecting drum.

Gear folder

A sheet transfer apparatus which can vary the effective spacing between the cutting cylinder and the transfer cylinder and between the transfer cylinder and the folding blade cylinder in a folding cylinder group for a rotary web-fed printing press is disclosed. The cutting knives and complementary counter cut bars of the cutting and transfer cylinders, respectively, are radially adjustable on the cylinders to insure that the webs of paper are accurately cut into sheets and transferred to the pins of the folding blade cylinder. The spacings can be adjusted to allow the folding cylinder group to operate in straight, single collect, and double collect productions.

Sheet transfer apparatus

In a sheet feeder for rotary printing presses having a feed table, a side register lay, and front register lays, a first push type conveyor is positioned in advance of the front lays and a second push type conveyor is positioned between the front lays and the continuously rotating impression cylinder of the printing press. These first and second conveyors cooperate to sequentially grip and convey sheets of paper and the like to the press's impression cylinder which is equipped with register lays and grippers. The feed table's front register lays are arranged to lift the first registered sheet thus permitting a succeeding sheet to advance beneath the raised sheet.

Sheet feeding apparatus for printing machines

A sheet feeding table has pull-type side lays and front lays. Mounted beneath the feeding table and nearer the front lays are suction drums spaced apart and rotated by a transversely extending drive shaft on which they are mounted. The shaft is driven through toothed wheels having relative axial movement with respect to each other. A cam plate rotates with the shaft and a pair of fixedly mounted rollers guide the cam plate and impart reciprocating motion to the shaft and the suction drums. The lateral shifting of the suction drums clears the sheet from the pull-type side lay for the successive sheet. Each drum has a suction piece sealed and biasedly positioned adjacent a portion of the inside peripheral surface of the drum which rotates thereby and brings the drum suction holes into communication with the suction chamber within the suction piece. The suction chamber is in communication with a vacuum supply and a control valve is interposed in the supply. The sheets are fed to an impression cylinder having front stops and a series of sheet grippers. The speed of the drums is raised somewhat excessively to convey the sheets against the front stop in the impression cylinder.

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Wurzburg, Germany

Hans B Bolza-Schunemann