Albert-frankenthal Ag

Joachim Dorow

Joachim Bernauer

Primin Gobel

A gravure printing machine cylinder has a means for mounting wrap-on gravure plates thereon using a tensioner able to be rocked about the shaft of the cylinder and having an outer cylindrical face in keeping with the outline of the cylinder in the printing condition. In order to be certain of a truly cylindrical outline of the wrap-on plate that is to be fixed on the cylinder, while at the same time decreasing the distance through which the plate is pulled when being mounted, the tensioner has a member with a beaked rim that is able to be rocked about an axis parallel to the cylinder axis separately from the tensioner, said beaked rim functioning with a gripping part in taking up and fixing in place the mounting fold or flap of the wrap-on plate.

Gravure cylinder

In the case of a device for holding offset or other plates on the plate cylinder of a printing press with two clamping members on the two sides of a well running in the axial direction of the cylinder and each having a gripping part of clamping the hooked ends of the plate and at least one of the members may be rocked about an axis parallel to the axis of turning of the cylinder, the necessary width of the well may be greatly decreased in the clamped condition of the system of one of the clamping members, that is able to be rocked, takes the form of a segment bar having a cross-section that is generally three-sided and segment-like. This bar may be placed next to an outer face of the cylinder body and has an outer face lined up with and continuing the outer face of the cylinder body. The segment bar further has a convex, part-cylindrical base face at a limit of the outer face of the bar, the convex base face fitting into a socket therefore in the cylinder body, the socket being part-cylindrical and concave with a curvature in keeping with the form of the convex face. Because the well is narrow there is more space for the printing image on the plate cylinder.

Apparatus for holding printing plates on the cylinder of a printing press

For producing quality work on a printing machine using a hard printing plate and high viscosity printing ink taken up by a fountain roller running in an ink fountain and transported by the fountain roller to an ink drum running against at least one form roller for inking the plate, while nevertheless keeping the inking system design simple, the inking unit has a single form roller having a diameter equal to that of the working diameter of the plate and designed to be run at the same surface speed as the plate: the drum for inking the form roller has a screen on its outer face made up of ink takeup pockets separated by lands, the ink drum having a smaller diameter than the form roller and being turned by a driving system of the press. The outer face of the ink drum with the screen is stripped by a stripping unit, such as doctor plate, running on and clearing the lands between the ink takeup pocket. Furthermore the fountain roller is run with a speed different to that of the screened ink drum.

Growing community of inventors

Frankenthal, Germany

Joachim Dorow