Short inking system for a rotary printing machine

1. A short inking system of a rotary printing press comprising:

a first short inking unit including a first screen roller, having a first screen roller diameter and circumference;

a first ink application roller in contact with said first screen roller and having a first ink application roller diameter and circumference;

a second short inking unit including a second screen roller having a second screen roller diameter and circumference;

a second ink application roller in contact with said second screen roller and having a second ink application roller diameter and circumference;

a forme cylinder which receives ink from said first and second ink application rollers, said forme cylinder having a forme cylinder circumference, said forme cylinder circumference being twice said first and second ink application roller circumference;

first and second printing formes on said forme cylinder;

a first, axially movable smoothing cylinder in engagement with said first ink application roller and having a first smoothing cylinder diameter equal to said first ink application roller diameter, and a first smoothing cylinder circumference, said forme cylinder circumference being twice said first smoothing cylinder circumference; and

a second axially movable smoothing cylinder in engagement with said second ink application roller and having a second smoothing cylinder diameter equal to said second ink application roller diameter, and a second smoothing cylinder circumference, said forme cylinder circumference being twice said second smoothing cylinder circumference.

2. The short inking system of claim 1 further including a number of said short inking units associated with said forme cylinder, said number of said short inking units equaling a whole number multiple which said forme cylinder circumference is in relation to said at least first ink application roller circumference.

3. The short inking system of claim 1 wherein said at least one ink application roller has an offset rubber blanket.

4. The short inking system of claim 1 wherein said ink application rollers, said smoothing cylinders, said screen rollers and said forme cylinder are synchronized by gear wheels.

5. The short inking system of claim 1 further including bearer rings for said first and second ink application rollers and said first and second screen rollers.

6. The short inking system of claim 1 wherein each said ink application roller and each said screen roller have bearer rings acting together in pairs.

7. The short inking system of claim 1 further including a transfer cylinder acting with said forme cylinder.

8. The short inking system of claim 7 wherein said transfer cylinder and said forme cylinder have bearer rings acting together in pairs and further wherein said ink application roller and said screen rollers have bearer rings acting in pairs.

9. The short inking system of claim 7 wherein said transfer cylinder and said forme cylinder have pretensioned roller bearings acting together in pairs and further wherein each said ink application roller and each said screen roller have pretensioned roller bearings acting in pairs.

10. The short inking system of claim 1 further including pretensioned rolling bearings for said ink application roller and said screen roller.

11. The short inking system of claim 1 wherein said ink application roller and said screen roller have roller bearings acting together in pairs.

12. The short inking system of claim 1 further including a functionally endless blanket on said at least one ink application roller.

13. The short inking system of claim 1 further including a chamber doctor blade associated with said screen roller.

14. The short inking system of claim 1 wherein a ratio of a screen on said screen roller to a ratio of a screen on a printing forme on said forme cylinder is greater than 0.8.

15. The short inking system of claim 1 further wherein a ratio of a circumferential displacement per angular unit of each said smoothing roller to an axial displacement per angular unit of each said smoothing roller is between 2.5 and 5.

16. A method of using an inking system of a rotary printing press including:

providing a screen roller having a screen roller diameter and circumference;

providing said screen roller circumference having a screen roller resolution;

providing printing ink of a viscosity of at least 9000 mPa.s to said screen roller;

providing at least first and second inking rollers;

having one of said first and second inking rollers acting as an ink application roller and having an ink application roller circumference;

having the other of said first and second inking rollers acting as an ink smoothing cylinder contacting said ink applicator roller;

providing a forme cylinder having a forme cylinder circumference;

selecting said forme cylinder circumference as a whole number multiple of said ink application roller circumference;

using said ink application roller for inking said forme cylinder;

supporting one of said ink application roller and said ink smoothing cylinder for movement in an axial direction;

moving said axially movable one of said ink application roller and said ink smoothing cylinder in a first axial movement direction during one printing movement of said forme cylinder;

reversing said movement direction while said axially movable one of said ink application roller and said ink smoothing cylinder is aligned with a cylinder trough of a cooperating one of said ink forme cylinder and said other of said first and second inking rollers;

providing at least one image on said forme cylinder and having an image resolution; and

selecting said screen roller resolution and said forme cylinder resolution wherein a ratio of said screen roller resolution to said image resolution is greater than 0.5.

17. The method of claim 16 further including providing a second ink application roller.

18. The method of claim 17 further including providing said second ink application roller as is a smoothing cylinder supported for axial movement.

19. The method of claim 18 further including providing said forme cylinder, said ink application roller and said smoothing roller having equal diameters.

20. The method of claim 18 further including using gears for synchronizing said ink application roller, said smoothing cylinder, said screen roller and said forme cylinder.

21. The method of claim 18 further including providing said forme cylinder circumference being twice said ink application roller circumference and twice said smoothing cylinder circumference, said forme cylinder having two formes and two short inking units, said ink application roller and said smoothing cylinder of each said short inking unit contacting only their associated one of said two formes.

22. The method of claim 16 further including providing a plurality of said inking systems associated with said forme cylinder, and selecting a number of said plurality of inking systems equaling a whole number multiple which said forme cylinder circumference is in relation to said at least one ink application roller circumference.

23. The method of claim 16 further including providing said at least one ink application roller having an offset rubber blanket.

24. The method of claim 16 further including providing bearer rings for said ink application roller and said screen roller.

25. The method of claim 16 further including providing said ink application roller and said screen roller having bearer rings acting together in pairs.

26. The method of claim 16 further including providing a transfer cylinder acting with said forme cylinder.

27. The method of claim 26 including providing said transfer cylinder and said forme cylinder having bearer rings acting together in pairs and further providing said ink application roller and said screen rollers having bearer rings acting in pairs.

28. The method of claim 26 including providing said transfer cylinder and said forme cylinder having pretensioned roller bearings acting together in pairs and further providing said ink application roller and said screen roller having pretensioned roller bearings acting in pairs.

29. The method of claim 16 further including providing pretensioned rolling bearings for said ink application roller and said screen roller.

30. The method of claim 16 including providing said ink application roller and said screen roller having roller bearings acting together in pairs.

31. The method of claim 16 further including providing a functionally endless blanket on said at least one ink application roller.

32. The method of claim 16 further including providing a chamber doctor blade associated with said screen roller.

33. The method of claim 16 including providing a ratio of a screen on said screen roller to a ratio of a screen on a printing forme on said forme cylinder being greater than 0.8.

34. The method of claim 16 further including providing at least one additional inking roller in addition to said ink application roller as a smoothing cylinder.

35. The method of claim 34 further including supporting said smoothing cylinder for axial movement.

36. The method of claim 16 further including providing a plurality of inking systems to said forme cylinder and selecting said number of inking systems to equal a whole number multiple defined by a ratio of said forme cylinder circumference to said ink application roller circumference.

37. The method of claim 16 further including providing a transfer cylinder acting together with said forme cylinder.

38. The method of claim 37 further including pairs of bearing rings acting between said transfer cylinder and said forme cylinder and pairs of bearer rings acting between said ink application roller and said screen roller.

39. The method of claim 37 further including providing pairs of pretensioned roller bearings acting between said transfer cylinder and said forme cylinder and pairs of pretensioned roller bearings acting between said ink application roller and said screen roller.

40. The method of claim 16 further including providing pretensioned roller bearings for said ink application roller and said screen roller.

41. The method of claim 16 further including providing pretensioned roller bearings acting in pairs for said ink application roller and said other of said first and second inking rollers.

42. The method of claim 16 further including providing a pasty printing ink of a viscosity greater than 9000 mPa.s for use with said screen roller.

43. The method of claim 16 further including providing a ratio of a circumferential length per angular unit of said ink application roller in relation to an axial displacement per angular unit of said ink application roller being between 2.5 and 5.

44. A short inking system of a rotary printing press comprising:

a screen roller, said screen roller having a screen roller diameter and a screen roller circumference;

at least a first ink application roller in contact with said screen roller, said at least first ink application roller having a first ink application roller circumference and a first ink application roller diameter;

a forme cylinder which receives ink from said at least first ink application roller, said forme cylinder having a forme cylinder circumference;

means for driving said at least first ink application roller for rotation independently of said forme cylinder and in synchronization with said forme cylinder; and

means for supporting said at least first ink application roller for axial displacement and wherein a ratio of a circumferential displacement per angular unit of movement of said axially displaceable first ink application roller to an axial displacement per angular unit of movement of said axially displaceable first ink application roller is between 2.5 and 5.

45. The short inking system of claim 44 further including a second ink application roller.

46. The short inking system of claim 45 wherein said second ink application roller is a smoothing cylinder supported for axial movement.

47. The short inking system of claim 46 wherein said forme cylinder, said ink application roller and said smoothing roller diameter are equal.

48. The short inking system of claim 46 wherein each said ink application roller, said smoothing cylinder, said screen roller and said forme cylinder are synchronized by gear wheels.

49. The short inking system of claim 46 wherein said forme cylinder circumference is twice said ink application roller circumference and twice said smoothing cylinder circumference, said forme cylinder having two formes and two short inking units, said ink application roller and said smoothing cylinder of each said short inking unit contacting only their associated one of said two formes.

50. The short inking system of claim 44 further including a plurality of inking systems associated with said forme cylinder, a number of said plurality of inking systems equaling the whole number multiple which said forme cylinder circumference is in relation to said at least first ink application roller circumference.

51. The short inking system of claim 44 wherein said first one ink application roller has an offset rubber blanket.

52. The short inking system of claim 44 further including bearer rings for said ink application roller and said screen roller.

53. The short inking system of claim 44 wherein said ink application roller and said screen roller have bearer rings acting together in pairs.

54. The short inking system of claim 44 further including a transfer cylinder acting with said forme cylinder.

55. The short inking system of claim 54 wherein said transfer cylinder and said forme cylinder have pretensioned roller bearings acting together in pairs and further wherein said ink application roller and said screen roller have pretensioned roller bearings acting in pairs.

56. The short inking system of claim 54 wherein said transfer cylinder and said forme cylinder have bearer rings acting together in pairs and further wherein said ink application roller and said screen rollers have bearer rings acting in pairs.

57. The short inking system of claim 44 further including pretensioned rolling bearings for said ink application roller and said screen roller.

58. The short inking system of claim 44 wherein said ink application roller and said screen roller have roller bearings acting together in pairs.

59. The short inking system of claim 44 further including a functionally endless blanket on said at least one ink application roller.

60. The short inking system of claim 44 further including a chamber doctor blade associated with said screen roller.

61. The short inking unit of claim 44 wherein a ratio of a screen on said screen roller to a ratio of a screen on a printing forme on said forme cylinder is greater than 0.8.