Plate cylinder for a sleeve-type printform
AssigneeMAN Roland Druckmaschinen AG
InventorsEduard Hoffman, Wolfgang Prem, Alfons Grieser, Johann Winterholler
Life of this patent
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Abstract
A plate cylinder for a sleeve-type printform, particularly an aluminum offset printform, with a ramp-like transition piece as a guide surface for the mechanical expansion of the sleeve-type printform onto the larger cylinder diameter. At least the surface area of the plate cylinder that is covered by the ramp-like transition piece has a highly wear-resistant and pressure-resistant slide surface of a material different from the remaining surface material of the plate cylinder to prevent abrasion when the printform is slipped onto the plate cylinder.
Claims10
A plate cylinder for a sleeve-type printform, comprising:
- a large diameter cylinder segment of a first material for receiving a sleeve-type print form;
- a ramp-like piece at an end of the cylinder segment and having a surface area for mechanically expanding the sleeve-type print form onto the large diameter cylinder segment;
- and a slide surface element arranged at least at the surface area of the ramp-like piece, the slide surface element being of a different material than the cylinder segment.
A plate cylinder for a sleeve-type print form, comprising:
- a large diameter cylinder segment for receiving a sleeve-type print form;
- a ramp-like piece at an end of the cylinder segment and having a surface area for mechanically expanding the sleeve-type print onto the large diameter segment;
- and
- a ring element arranged at the surface area of the ramp-like piece and connected to the large diameter segment, the ring element having a slide surface that defines a first guide surface for precentering the print form and is of a different material than the remaining portions of the plate cylinder.
A plate cylinder for a sleeve-type print form, comprising:
- a large diameter cylinder segment for receiving a sleeve-type print form;
- a ramp-like piece at an end of the cylinder segment and having a surface area for mechanically expanding the sleeve-type print form onto the large diameter segment;
- a slide surface element arranged at least at the surface area of the ramp-like piece, the slide surface element being of a different material than remaining portions of the plate cylinder;
- and
- a small diameter cylinder segment connected to an end of the ramp-like piece opposite the large diameter cylinder segment for precentering the print form, a circumferential ring groove being provided in a surface of the cylinder between the small diameter segment and the large diameter segment, the slide surface element being arranged in the ring groove and adapted to form the ramp-like piece.
Dependencies are inferred from the claim text.