Internally piped print cylinder and method for making same
A print cylinder having a first header, a second header and a hollow cylinder body is internally piped. The first header includes an air inlet and an air outlet. The air outlet is sealingly connected to a central conduit which is sealingly attached to a disk, the disk being sealed about its perimeter to the cylinder body. The second header includes an air inlet and at least one air outlet, the air outlet being connected to a perimeter groove defined about the outer surface of the second header. Apertures are defined within the print cylinder immediately above the perimeter groove whereby an air flow continuum is created from the air inlet of the first header, through the central conduit, through the second header inlet and outlet, through the perimeter groove and through the cylinder apertures. Secondary apertures are defined within the cylinder body, each connected in an air flow continuum to the central conduit by means of secondary conduits.
1. An internally piped print cylinder comprising:
a drive side header; said drive side header including an air inlet bore;
a tending side header, the tending side header including a central axis, a proximal end and a distal end, an air outlet means including a first internal bore disposed axially within the proximal end of the tending side header but not extending fully through to the distal end of the tending side header, at least one second internal bore disposed perpendicularly to the axis of the tending side header, and an outer circumferential surface, the second internal bore extending from one side of the outer surface to the first internal bore;
a thin walled print cylinder extending longitudinally between the drive side header and the tending side header, said thin walled print cylinder having an outer surface and a hollow inside area;
a sealing plate, the sealing plate being disposed within the hollow inside area of the cylinder towards so as to create a cylindrically-shaped void between the sealing plate and the tending side header, the sealing plate having a central bore;
a centrally disposed internal pipe, the internal pipe comprising a proximal end, a distal end, an internal bore that extends between the proximal end and the distal end, the proximal end of the internal pipe being functionally adapted to be received by the second internal bore of the drive side header, the distal end of the internal pipe being received within the central bore of the sealing plate, the internal pipe forming an air flow continuum with the cylindrically-shaped void created between the sealing plate and the drive side header and with the air inlet bore of the drive side header; and
a plurality of axially extending pipes for passing air from the internal pipe to the cylindrical portion of the print cylinder and to the air outlet means of the tending side header;
wherein air applied to the air inlet means of the drive side header passes to the outer surface of the print cylinder.
2. The print cylinder of claim 1 wherein the drive side header has a central axis, a proximal end and a distal end, and the air inlet means includes an air inlet bore that is disposed generally perpendicular to the axis of the drive side header at the proximal end of the drive side header, a first internal bore that is disposed along the axis of the drive side header and intersects the air inlet bore, the first internal bore extending from the proximal end of the drive side header to the distal end, and a second internal bore that is axially aligned with the drive side header, but is of a diameter that is greater than that of the first internal bore.
3. The print cylinder of claim 2 including a plurality of auxiliary pipes extending outwardly from the centrally disposed internal pipe, said auxiliary pipes being located at various positions along the length of the print cylinder.
4. The print cylinder of claim 3 wherein each auxiliary pipe is radially disposed generally 180 degrees from the next adjacent auxiliary pipe.
5. The print cylinder of claim 3 wherein the centrally disposed internal pipe includes a plurality of apertures defined within it, the outer surface of the cylinder includes a plurality of apertures defined within it, and each auxiliary pipe includes a proximal end, a distal end and a central bore, the proximal end of each auxiliary pipe being functionally adapted to be secured within an aperture defined within the internal pipe and the distal end being functionally adapted to be secured within an aperture defined within the cylindrical portion outer surface.
6. The print cylinder of claim 5 wherein the air outlet means of the tending side header includes a plurality of holes defined about the periphery of the cylindrical portion, such holes being aligned with the peripheral groove of the tending side header to form an air flow continuum therewith.
7. The print cylinder of claim 6 wherein the holes are aligned at 45 degrees relative to one another.
8. A method for making an internally piped print cylinder comprising the steps of:
providing a relatively thin-walled print cylinder having a drive side header, a central axis, a proximal end and a distal end;
creating a first air inlet bore that is disposed generally perpendicular to the axis of the drive side header at the proximal end of the drive side header;
creating a first internal bore that is disposed along the axis of the drive side header and intersects the air inlet bore, the first internal bore extending from the proximal end of the drive side header to the distal end;
creating a second internal bore that is axially aligned with the drive side header, but is of a diameter that is greater than that of the first internal bore;
providing a tender side header;
creating a first internal bore in the tender side header;
creating a circumferential groove around the tender side header;
creating a second internal bore extending axially outwardly from the first internal bore into the circumferential groove;
providing a centrally disposed internal pipe, the internal pipe comprising a proximal end, a distal end, an internal bore that extends between the proximal end and the distal end, the proximal end of the internal pipe being received by the second internal bore of the drive side header;
providing a sealing plate, said sealing plate including a central bore and an outer perimeter, the distal end of the internal pipe being functionally adapted to be received within the central bore of the sealing plate, the internal pipe forming an air flow continuum with the air inlet bore of the drive side header; and
providing a plurality of auxiliary pipes, each of said plurality of auxiliary pipes being connected in air flow continuum to the internal pipe and to the exterior of the print cylinder; and
providing a plurality of air flow apertures within the cylinder, each of said plurality of air flow apertures being aligned with an auxiliary pipe or with the peripheral groove of the tending side header.
9. The method of claim 8 wherein each auxiliary pipe is axially disposed generally 180 degrees from the next adjacent auxiliary pipe.
10. The method of claim 9 wherein the air flow apertures that are aligned with the peripheral groove of the tending side header are disposed 45 degrees from one another.