US2006048660A1PendingUtilityA1

Characterization, determination of a characteristic number and selection of suitable dressings on cylinders of a printing press

Assignee: SCHASCHEK KARL E APriority: Apr 11, 2002Filed: Oct 28, 2005Published: Mar 9, 2006

Est. expiryApr 11, 2022(expired)· nominal 20-yr term from priority

Inventors:Karl Erich Albert Schaschek Ralf Christel Oliver Hahn Bernd Kurt Masuch Kurt Johannes Weschenfelder

B41F 30/04B41N 10/04Y10T428/24992B41F 13/193

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References

Claims

Abstract

In connection with a method for characterization of a layer, a method and a device for determining a characteristic number, as well as a method for selecting a suitable dressing on rollers, or suitable geomtries of rollers of a printing press, a characterizing number for characterizing a layer is formed, or employed, which characterizes the roll-off behavior independently of a measuring device or an application in a particular printing group.

Claims

exact text as granted — not AI-modified

1 . A print unit comprising:
at least first and second cooperating rollers; an elastic layer on a surface of one of said first and second rollers; an undeformable surface on the other one of said first and second rollers; a characterizing a number between 0.980 and 1.000 which describes elastic properties of an area of relative compression of said elastic layer, said characterizing number being formed by an algebraic specification α = I real - I inkomp I komp - I inkomp wherein I komp , I inkomp represent numbers of revolutions ratios for extreme cases of a purely compressible and of a purely incompressible elastic layer I real and represents a desired number of revolutions ratio.

2 . The print unit of claim 1 wherein said number of revolutions ratio I real deviates from 1.000 /n in the range of not more than 0.002 in the case of a variation of the relative compression of said layer wherein n represents a ratio between a number of printed pages in a circumferential direction of the one of said first and second rollers with said elastic layer to a number of printed pages on the other of said first and second rollers.

3 . A print unit comprising:
at least first and second cooperating rollers; at least one of said first and second cooperating rollers having an elastic layer on its surface, the other of said at least first and second rollers having an undeformable surface, said layer and geometries of said first and second rollers being alternatingly matched to each other wherein in case of a variation in at least a section of a relative compression of said elastic layer, a number of revolutions ratio I real deviates from 1.000/n in a range of no greater than 0.002 wherein n represents a ratio between a number of printed pages in a circumferential direction of said roller with said layer to a number of printed pages on said roller with said undeformable surface.

4 . The print unit of claim 3 wherein in case of a variation in at least one area of said relative compression of said layer said number of revolutions ratio I real deviates from 1.000/n in a range of no greater than 0.001.

5 . A print unit comprising:
at least first and second cooperating rollers; an elastic layer on a surface of one of said first and second rollers; and a largely undeformable surface on the other of said first and second rollers, wherein geometries of said first and second rollers are alternatingly matched to each other such that in at least an area of contact with a relative compression of said elastic layer a differential quotient (d Ireal /dS) between a number of revolutions ratio (I real ) and said relative compression deviates at no more than 0.01 from zero.

6 . The print unit of claim 3 wherein said elastic layer has a characterizing number α of 0.980 to 1.000 for said area of relative compression and wherein said characterizing number is formed by the algebraic specification

α
=

I
real

I
inkomp

I
komp

I
inkomp

wherein I komp and I inkomp represent numbers of revolutions ratios for the extreme cases of a purely compressible or a purely incompressible layer and I real represents a desired number of revolutions ratio.

7 . The print unit of claim 5 wherein said elastic layer has a characterizing number α of 0.980 to 1.000 for said area of relative compression and wherein said characterizing number is formed by the algebraic specification

α
=

I
real

I
inkomp

I
komp

I
inkomp

8 . The print unit of claim 5 wherein in an area of said relative compression, said differential quotient (dl real /dS) between said number of revolutions ratio I real and said compression deviates no more than 0.01 1/mm from zero.

9 . The print unit of claim 8 wherein said differential quotient (dl real /dS) is substantially zero.

10 . The print unit of claim 1 wherein said area of relative compression is a nip between said first and second rollers, wherein said first roller is a transfer cylinder and said second roller is a forme cylinder, said nip having an area of between 6% and 7% of an area of said elastic layer.

11 . The print unit of claim 5 wherein said area of relative compression is a nip between said first and second rollers, wherein said first roller is a transfer cylinder and said second roller is a forme cylinder, said nip having an area of between 6% and 7% of an area of said elastic layer.

12 . The print unit of claim 1 wherein said area of relative compression is a nip between said first roller embodies as a transfer cylinder and said second roller embodied as a satellite cylinder and wherein said area lies between 9% and 10% of an area of said elastic layer.

13 . The print unit of claim 5 wherein said area of relative compression is a nip between said first roller embodies as a transfer cylinder and said second roller embodied as a satellite cylinder and wherein said area lies between 9% and 10% of an area of said elastic layer.

14 . The print unit of claim 1 wherein said first and second rollers have effective diameters between 260 and 400 mm and wherein said elastic layer has a characterizing number α between 0.989 and 1.000.

15 . The print unit of claim 6 wherein said first and second rollers have effective diameters between 260 and 400 mm and wherein said elastic layer has a characterizing number α between 0.989 and 1.000.

16 . The print unit of claim 7 wherein said first and second rollers have effective diameters between 260 and 400 mm and wherein said elastic layer has a characterizing number α between 0.989 and 1.000.

17 . The print unit of claim 1 wherein said first and second rollers have effective diameters between 120 and 180 mm and wherein said elastic layer has a characterizing number α between 0.980 and 0.990.

18 . The print unit of claim 6 wherein said first and second rollers have effective diameters between 120 and 180 mm and wherein said elastic layer has a characterizing number α between 0.980 and 0.990.

19 . The print unit of claim 7 wherein said first and second rollers have effective diameters between 120 and 180 mm and wherein said elastic layer has a characterizing number α between 0.980 and 0.990.

20 . The print unit of claim 1 wherein said first roller with said elastic layer has an effective diameter between 260 and 400 mm, said second roller has an effective diameter between 150 and 190 mm and said elastic layer has a characterizing number α between 0.987 and 1.000.

21 . The print unit of claim 2 wherein said first roller with said elastic layer has an effective diameter between 260 and 400 mm, said second roller has an effective diameter between 150 and 190 mm and said elastic layer has a characterizing number α between 0.987 and 1.000.

22 . The print unit of claim 7 wherein said first roller with said elastic layer has an effective diameter between 260 and 400 mm, said second roller has an effective diameter between 150 and 190 mm and said elastic layer has a characterizing number α between 0.987 and 1.000.

23 . The print unit of claim 1 wherein said first roller with said elastic layer is a transfer cylinder and said second roller with said undeformable surface is a forme cylinder.

24 . The print unit of claim 3 wherein said first roller with said elastic layer is a transfer cylinder and said second roller with said undeformable surface is a forme cylinder.

25 . The print unit of claim 5 wherein said first roller with said elastic layer is a transfer cylinder and said second roller with said undeformable surface is a forme cylinder.

26 . The print unit of claim 1 wherein said first roller with said elastic layer is a transfer cylinder and said second roller with said undeformable surface is a satellite cylinder.

27 . The print unit of claim 3 wherein said first roller with said elastic layer is a transfer cylinder and said second roller with said undeformable surface is a satellite cylinder.

28 . The print unit of claim 5 wherein said first roller with said elastic layer is a transfer cylinder and said second roller with said undeformable surface is a satellite cylinder.

29 . The print unit of claim 1 wherein said first and second rollers are cooperating rollers of an inking group.

30 . The print unit of claim 3 wherein said first and second rollers are cooperating rollers of an inking group.

31 . The print unit of claim 5 wherein said first and second rollers are cooperating rollers of an inking group.

32 . The print unit of claim 29 further including a drive motor for one of said first and second rollers and further wherein said other of said first and second rollers is driven by friction.

33 . The print unit of claim 30 further including a drive motor for one of said first and second rollers and further wherein said other of said first and second rollers is driven by friction.

34 . The print unit of claim 31 further including a drive motor for one of said first and second rollers and further wherein said other of said first and second rollers is driven by friction.

35 . The print unit of claim 23 further including a third roller embodied as a satellite cylinder, said satellite cylinder being driven by a satellite cylinder drive motor independent of said first and second cylinders, said satellite cylinder cooperating with said transfer cylinder.

36 . The print unit of claim 24 further including a third roller embodied as a satellite cylinder, said satellite cylinder being driven by a satellite cylinder drive motor independent of said first and second cylinders, said satellite cylinder cooperating with said transfer cylinder.

37 . The print unit of claim 25 further including a third roller embodied as a satellite cylinder, said satellite cylinder being driven by a satellite cylinder drive motor independent of said first and second cylinders, said satellite cylinder cooperating with said transfer cylinder.

38 . The print unit of claim 1 further including a common drive motor for said first and second rollers.

39 . The print unit of claim 3 further including a common drive motor for said first and second rollers.

40 . The print unit of claim 5 further including a common drive motor for said first and second rollers.

41 . The print unit of claim 1 wherein said first roller has a first drive motor and said second roller has a second drive motor, said first drive motor and said second drive motor being mechanically independent.

42 . The print unit of claim 3 wherein said first roller has a first drive motor and said second roller has a second drive motor, said first drive motor and said second drive motor being mechanically independent.

43 . The print unit of claim 5 wherein said first roller has a first drive motor and said second roller has a second drive motor, said first drive motor and said second drive motor being mechanically independent.

44 . A device for determining a roll-off behavior of an elastic layer comprising:
a first roller supporting the elastic layer; a second roller having a substantially undeformable surface; a frame supporting said first and second rollers; an eccentric bushing in said frame, said eccentric bushing supporting at least one of said first and second rollers wherein an axial distance between said first and second rollers can be changed; and means for determining a number of revolutions ratio (I real ) between said first and second rollers.

45 . The device of claim 44 further including a lever rigidly connected with said eccentric bushing, and a path measuring device engageable with said lever, said path measuring device determining said change in said axial distance.

46 . A device for determining a roll-off behavior of an elastic layer comprising:
a first roller supporting the elastic layer; a second roller having a substantially undeformable surface; means supporting said first and second rollers for changing an axial spacing distance between said first and second rollers; a lever supported by one of said first and second rollers, said lever transmitting said change in said axial spacing distance; a path-measuring device in contact with said lever and detecting said change in said axial spacing distance; and means for determining a number of revolutions ratio (I real ) between said first and second rollers.

47 . The device of claim 46 further including eccentric bushings supporting at least one of said first and second rollers, said lever being rigidly connected to said eccentric bushings.

48 . The device of claim 44 wherein said lever is pivotally supported by a pivot point intermediate said eccentric bushing and said path-measuring device and further wherein a ratio of a distance from said pivot point to said path-measuring device and an eccentrically of said eccentric bushing is equal to or greater than twenty.

49 . The device of claim 47 wherein said lever is pivotally supported by a pivot point intermediate said eccentric bushing and said path-measuring device and further wherein a ratio of a distance from said pivot point to said path-measuring device and an eccentrically of said eccentric bushing is equal to or greater than twenty.

50 . The device of claim 44 further including a plane defined by axes of rotation of said first and second rollers in a position of said first and second rollers in which a linear contact of said surface takes place and further wherein said eccentric bushing has an eccentricity, said eccentricity forming an angle of between 75° and 120° with said plane.

51 . The device of claim 47 further including a plane defined by axes of rotation of said first and second rollers in a position of said first and second rollers in which a linear contact of said surface takes place and further wherein said eccentric bushing has an eccentricity, said eccentricity forming an angle of between 75° and 120° with said plane.

52 . The device of claim 44 further including a rotary sensor for each said first and second rollers, each said rotary sensor being usable to determine at least one of an angular velocity and an angle of rotation position for each said associated roller.

53 . The device of claim 47 further including a rotary sensor for each said first and second rollers, each said rotary sensor being usable to determine at least one of an angular velocity and an angle of rotation position for each said associated roller.

54 . The device of claim 44 further including an external drive for one of said first and second rollers and wherein the other of said first and second rollers is driven by friction.

55 . The device of claim 47 further including an external drive for one of said first and second rollers and wherein the other of said first and second rollers is driven by friction.

56 . The device of claim 54 wherein said external device is selectively engageable with one of said first and second rollers.

57 . The device of claim 55 wherein said external device is selectively engageable with one of said first and second rollers.

58 . The device of claim 45 wherein said path-measuring device is a dial gauge with a resolution of less than or equal to 0.05/mm/360°.

59 . The device of claim 46 wherein said path-measuring device is a dial gauge with a resolution of less than or equal to 0.05/mm/360°.

60 . The device of claim 45 further including a positionally displaceable detent, said lever being engageable with said detent.

61 . The device of claim 46 further including a positionally displaceable detent, said lever being engageable with said detent.

62 . The device of claim 45 further including an actuator adapted to pivot said lever.

63 . The device of claim 46 further including an actuator adapted to pivot said lever.

64 . The device of claim 60 further including a cylinder chargeable with a pressure medium, said cylinder forming an actuator for said lever, said lever being movable into contact with said detent by operation of said actuator.

65 . The device of claim 61 further including a cylinder chargeable with a pressure medium, said cylinder forming an actuator for said lever, said lever being movable into contact with said detent by operation of said actuator.

66 . The device of claim 62 further including a cylinder chargeable with a pressure medium, said cylinder forming an actuator for said lever, said lever being movable into contact with said detent by operation of said actuator.

67 . The device of claim 63 further including a cylinder chargeable with a pressure medium, said cylinder forming an actuator for said lever, said lever being movable into contact with said detent by operation of said actuator.

68 . The device of claim 44 further including a light source adapted to illuminate a gap between said first and second rollers, said light source being usable to determine a compression zero point between said first and second rollers.

69 . The device of claim 46 further including a light source adapted to illuminate a gap between said first and second rollers, said light source being usable to determine a compression zero point between said first and second rollers.

70 . A method for dimensioning a roller of a print unit including:
providing a roll-off behavior measuring device; using said roll-off behavior measuring device and determining a roll-off behavior of an elastic layer usable in the print unit; providing a first roller in the print unit having a first predetermined diameter; and determining a suitable diameter of a second roller using said roll-off behavior of said elastic layer.

71 . The method of claim 70 further including determining a characterizing number, said characterizing number characterizing said roll-off behavior of the elastic layer, and determining said suitable diameter using an algebraic specification taking into consideration said characterizing number and thickness of said elastic layer.

72 . The method of claim 71 further including initially determining said characterizing number using a measurement obtained using said measuring device and subsequently correcting said characterizing number for a geometry of said measuring device using said algebraic specification.

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