Gapless compressible cylinder assembly

• US 20040103804A1
• Filed: 12/03/2002
• Published: 06/03/2004
• Est. Priority Date: 12/03/2002
• Status: Active Grant

• Current Assignee: Day International Group Incorporated (ColourOz TopCo)
• Original Assignee: Day International Group Incorporated (ColourOz TopCo)
• Inventors: Loyer, Phillip K., Rogrove, Arthur H., McLean, Michael E.
• Granted Patent: US 6,799,511 B2
• Time in Patent Office: Days
• US Class Current: 101/375
• CPC Class Codes: B41F 27/105 for attaching cylindrical printing formes

Abstract

A gapless printing system includes a cylinder assembly and a printing sleeve. The cylinder assembly includes a compressible layer located between an inner shell and an outer shell. A support carrier is coupled to the inner shell about each of the first and second end portions and is adapted such that the cylinder assembly is mountable in a printing press. A printing sleeve is removably attachable to the cylinder assembly by installing the printing sleeve over the outer shell such that when the printing sleeve is mounted on the cylinder assembly, lateral and rotational motion of the printing sleeve with respect to the cylinder assembly is prevented.

Claims

1. A print cylinder assembly comprising:

a cylinder assembly comprising;

an inner shell having a first end portion, a second end portion, and a body portion;

a support carrier coupled to said inner shell about each of said first and second end portions, said support carrier adapted to support said printing cylinder system when said cylinder assembly is mounted on a printing press;

an outer shell positioned over and generally coaxial with said inner shell; and

a compressible layer located between said inner shell and said outer shell, wherein a printing sleeve is removably attachable to said cylinder assembly over said outer shell such that when said printing sleeve is mounted on said cylinder assembly, lateral and rotational motion of said printing sleeve with respect to said cylinder assembly is prevented.

2. The print cylinder assembly according to claim 1, wherein said support carrier comprises a first plug at said first end portion and a second plug at said second end portion of said inner shell.

3. The print cylinder assembly according to claim 1, wherein said inner shell comprises a carbon fiber shell.

4. The print cylinder assembly according to claim 1, wherein said outer shell comprises a carbon fiber shell.

5. The print cylinder assembly according to claim 1, wherein said outer shell of said cylinder assembly is adapted to deflect when operating in the nip of offset transfer points in an offset printing operation.

6. The print cylinder assembly according to claim 1, wherein said inner shell is substantially hollow.

7. The print cylinder assembly according to claim 1, wherein said outer shell of said cylinder assembly has an outside diameter and said printing sleeve has an inside diameter normally less than said outside diameter of said outer shell, wherein said printing sleeve is removably securable to said cylinder assembly by diametrically expanding said inside diameter of said printing sleeve to fit over said outer shell such that said printing sleeve is secured to said cylinder assembly by frictional forces.

8. The print cylinder assembly according to claim 7, wherein said cylinder assembly further comprises a plurality of apertures extending through said outer shell, said apertures arranged to allow the passage of gas under pressure to expand said inner diameter of said printing sleeve sufficient to allow said printing sleeve to slide over said cylinder assembly.

9. The print cylinder assembly according to claim 8, further comprising a compression/expansion valve coupled to said apertures, said expansion/contraction valve arranged to selectively accept a pressurized gas and force said pressurized gas.

10. The print cylinder assembly according to claim 1, wherein said cylinder assembly further comprises at least one reinforcing layer disposed between said inner and outer shells.

11. The print cylinder assembly according to claim 1, wherein said printing sleeve is releasably mechanically bonded to said outer shell of said cylinder assembly.

12. The print cylinder assembly according to claim 11, wherein said printing sleeve is releasably mechanically bonded to said outer shell of said cylinder assembly using Velcro.

13. The print cylinder assembly according to claim 1, wherein said printing sleeve is releasably securable to said cylinder assembly by a heat activated bonding adhesive.

14. The print cylinder assembly according to claim 1, wherein said printing sleeve is releasably securable to said cylinder assembly by a solvent activated bonding agent.

15. The print cylinder assembly according to claim 1, wherein said compressible layer comprises a layer of compressible material.

16. The print cylinder assembly according to claim 1, wherein said compressible layer comprises a chamber between said inner and outer shells, said chamber fillable with a fluid source.

17. The print cylinder assembly according to claim 16, further comprising an inflatable member positioned within said chamber arranged to receive and bleed said fluid source.

18. A print cylinder assembly comprising:

a cylinder assembly comprising;

an inner shell having a first end portion, a second end portion, and a body portion;

a support carrier coupled to said inner shell about each of said first and second end portions, said support carrier adapted to support said printing cylinder system when said cylinder assembly is mounted on a printing press;

a compressible layer around said inner shell; and

an outer shell defined by a first durable layer over said compressible layer, wherein a printing sleeve is removably attachable to said cylinder assembly over said outer shell such that when said printing sleeve is mounted on said cylinder assembly, lateral and rotational motion of said printing sleeve with respect to said cylinder assembly is prevented.

19. The print cylinder assembly according to claim 18, wherein said inner shell comprises steel.

20. The print cylinder assembly according to claim 18, wherein said compressible layer comprises a select one of an elastomeric layer, a polymeric layer and a chamber inflatable using a fluid source.

21. The print cylinder assembly according to claim 18, wherein said first durable layer comprises a thin film.

22. The print cylinder assembly according to claim 18, wherein said support carrier comprises a first plug at said first end portion and a second plug at said second end portion of said inner shell.

23. The print cylinder assembly according to claim 18, wherein said outer shell of said cylinder assembly is adapted to deflect when operating in the nip of offset transfer points in an offset printing operation.

24. The print cylinder assembly according to claim 18, wherein said inner shell is substantially hollow.

25. The print cylinder assembly according to claim 18, wherein said first durable layer of said cylinder assembly has an outside diameter and said printing sleeve has an inside diameter normally less than said outside diameter of said first durable layer, wherein said printing sleeve is removably securable to said cylinder assembly by diametrically expanding said inside diameter of said printing sleeve to fit over said first durable layer of said cylinder assembly such that said printing sleeve is secured to said cylinder assembly by frictional forces.

26. The print cylinder assembly according to claim 25, wherein said cylinder assembly further comprises a plurality of apertures extending through said first durable layer, said apertures arranged to allow the passage of gas under pressure through said apertures to expand said inner diameter of said printing sleeve sufficient to allow said printing sleeve to slide over said cylinder assembly.

27. The print cylinder assembly according to claim 26, further comprising a compression/expansion valve coupled to said apertures, said expansion/contraction valve arranged to selectively accept a pressurized gas and force said pressurized gas.

28. The print cylinder assembly according to claim 18, wherein said cylinder assembly further comprises at least one reinforcing layer disposed between said inner shell and said first durable layer.

29. The print cylinder assembly according to claim 18, wherein said printing sleeve is releasably mechanically bonded to said first durable layer of said cylinder assembly.

30. The print cylinder assembly according to claim 29, wherein said printing sleeve is releasably mechanically bonded to said first durable layer of said cylinder assembly using Velcro.

31. The print cylinder assembly according to claim 18, wherein said printing sleeve is releasably securable to said cylinder assembly by a heat activated bonding adhesive.

32. The print cylinder assembly according to claim 18, wherein said printing sleeve is releasably securable to said cylinder assembly by a bonding agent activated by a select one of heat and solvent.

33. A gapless printing system comprising:

a cylinder assembly comprising;

a hollow carbon fiber inner shell having a first end portion, a second end portion, and a generally cylindrical body portion;

a support carrier coupled to said inner shell about each of said first and second end portions, said support carrier adapted to support said printing cylinder system when said cylinder assembly is mounted on a printing press;

a carbon fiber outer shell positioned over and generally coaxial with said inner shell, said carbon fiber outer shell adapted to allow said outer shell to deflect when operating in the nip of offset transfer points in an offset printing operation;

a plurality of apertures extending through said outer shell; and

a compressible layer located between said inner shell and said outer shell, wherein said compressible layer comprises a select one of an elastomeric layer, a polymeric layer and a chamber inflatable using a fluid source; and

a printing sleeve removably attachable to said cylinder assembly over said outer shell such that when said printing sleeve is mounted on said cylinder assembly, lateral and rotational motion of said printing sleeve with respect to said cylinder assembly is prevented, said apertures arranged to allow a pressurized gas through said apertures to expand said inner diameter of said printing sleeve sufficiently to allow said printing sleeve to slide over said cylinder assembly.

34. A method of fabricating a print cylinder assembly comprising:

forming an inner shell having a first end portion, a second end portion, and a body portion;

coupling a support carrier to said inner shell about each of said first and second end portions, said support carrier adapted to support said printing cylinder system when said cylinder assembly is mounted on a printing press;

positioning a compressible layer over said inner shell; and

positioning an outer shell over and generally coaxial with said inner shell and said compressible layer, wherein a printing sleeve is removably attachable to said cylinder assembly over said outer shell such that when said printing sleeve is mounted on said cylinder assembly, lateral and rotational motion of said printing sleeve with respect to said cylinder assembly is prevented.

35. The method of claim 34, wherein said support carrier is coupled to said inner shell by installing a first plug at said first end portion and a second plug at said second end portion of said inner shell.

36. The method of claim 34, wherein said inner shell is formed using a carbon fiber reinforced polymer resin.

37. The method of claim 34, wherein said outer shell is fabricated by forming a thin carbon fiber reinforced polymer resin.

38. The method of claim 34, wherein said outer shell of said cylinder assembly is adapted to deflect when operating in the nip of offset transfer points in an offset printing operation.

39. The method of claim 34, wherein said outer shell of said cylinder assembly is fabricated to have an outside diameter that is normally greater than an inside diameter of said printing sleeve, wherein said printing sleeve is removably securable to said cylinder assembly by diametrically expanding said inside diameter of said printing sleeve to fit over said outer shell such that said printing sleeve is secured to said cylinder assembly by frictional forces.

40. The method of claim 39, wherein said cylinder assembly is further fabricated by forming a plurality of apertures extending through said outer shell, said apertures arranged to allow the passage of gas under pressure to expand said inner diameter of said printing sleeve sufficient to allow said printing sleeve to slide over said cylinder assembly.

41. The method of claim 40, further comprising coupling a compression/expansion valve to said apertures, said expansion/contraction valve arranged to selectively accept a pressurized gas and force said pressurized gas.

42. The method of claim 34, wherein said printing sleeve is releasably mechanically bonded to said outer shell of said cylinder assembly.

43. The method of claim 34, wherein said printing sleeve is releasably securable to said cylinder assembly by a heat activated bonding adhesive.

44. The method of claim 34, wherein said printing sleeve is releasably securable to said cylinder assembly by a solvent activated bonding agent.

45. The method of claim 34, wherein the act of positioning said compressible layer comprises positioning a select one of an elastomeric layer, a polymeric layer and a chamber inflatable using a fluid source.