Device for conveying plate-like matter within a rotary printing machine
AssigneeBobst SA
InventorCharles Stark
Life of this patent
Estimating the term…
Abstract
A device for conveying a sheet of material from one printing unit to a second printing unit consisting of a frame having horizontal lateral beams, a plurality of cross-shafts extending between the beams, each shaft being provided with a plurality of axially-spaced rollers, a plate being mounted on a lower surface of each of the lateral beams having apertures arranged to allow a lower portion of each roller to extend therethrough and an arrangement for applying a suction to the interior of the frame to draw air in the gap between each aperture and roller to hold a sheet against the rollers as it is conveyed from one unit to the next.
Claims11
A device for conveying sheets within a rotary printing machine having printing units with cylindrical plate cylinders for printing sheets, said device including a horizontal frame having two lateral beams connected to one another by crossbars, at least one cross shaft being mounted for rotation between said lateral beams, each cross shaft being provided with rollers spaced along the shaft, a lower plate provided on a lower surface of the lateral beams, said plate having a separate rectangular aperture for each roller, said apertures allowing a lower portion of the rollers to extend through the plate and below a lower surface of said plate, means for forming a suction including a collector hood being connected to an upper side of the lateral beams, drive means for rotating each cross shaft, each of said apertures having a size greater than the size of the roller extending therethrough to leave a small gap surrounding each of the rollers, a downstream edge of each aperture of the lower plate being bent toward an axis of the roller, said rollers being positioned with the lower edge forming a plane for engaging an upper surface of a sheet being conveyed through the rotary printing machine and said frame including means for adjusting a vertical position of the rollers relative to an axis of the printing plate cylinder, as required by changes in the thickness of said sheet.
A device for conveying sheets within a rotary machine having at least two printing units, said device comprising a frame having two lateral beams connected to one another by cross beams to form a bottom surface having a plate being attached thereto, said plate having a lower surface and a plurality of rectangular apertures arranged in rows and columns, a plurality of cross-shafts being mounted for rotation on the lateral beams, with one shaft aligned with each column of apertures in said plate, each cross-shaft having a plurality of pressure rollers positioned above the apertures of the column with a lower portion of each roller extending through its respective aperture to protrude below said lower surface of said plate, means for rotating each of shafts, and suction means for applying a suction in the frame to draw a sheet onto the rollers and toward said plate.
Dependencies are inferred from the claim text.