Characterization, detection of a reference number, and selection of suitable winding materials for rollers of a printing press
AssigneeKoenig & Bauer Aktiengesellschaft
InventorsKarl Erich Albert Schaschek, Ralf Christel, Oliver Frank Hahn, Bernd Kurt Masuch, Kurt Johannes Weschenfelder
Life of this patent
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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 geometries 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.
Claims42
A method for determining a characterizing number (α), which characterizes the roll-off behavior of an elastic layer (06),
- in that in a measuring device with two rollers (17, 18), which roll off on each other, a number of revolutions ratio (Ireal) between the roller supporting the layer (06) and the other roller (17, 18) as a function of a compression (S) is measured,
- in that for the same compression (S) the extreme values, theoretically resulting for the purely compressible and the purely incompressible case, of the number of revolution ratios (Ikomp, Iinkomp) are determined,
- and subsequently the measured number of revolution ratio (Ireal) is brought into a relationship, at least over a section, with the theoretically determined number of revolution ratios (Ikomp, Iinkomp) in accordance with an algebraic specification in order to form the constant characterizing number (α), corrected for the geometry of the measuring device, at least over a section.
A method for dimensioning a roller (01, 02, 11, 12, 16) of a print unit, wherein
- the roll-off behavior of an elastic layer (06) is determined by means of a measuring device, and
- on the basis of a predetermined diameter (DwGZK, DwGZ, DwPZ) of one of the rollers (01, 02, 11, 12, 16), a suitable diameter (DwGZK, DwGZ, DwPZ) of the other roller (01, 02, 11, 12, 16) is determined.
A method for selecting a layer (06) on a roller (01, 02, 11, 12, 16), wherein
- initially the extreme values theoretically resulting for the purely compressible and the purely incompressible case of the number of revolutions ratio (Ikomp, Iinkomp) are determined, at least in sections, as a function of a compression (S) from the predetermined printing group geometry,
- a desired relative position for the number of revolutions ratio (Ireal) of an actual layer (06) in respect to the extreme values of the number of revolutions ratio (Ikomp, Iinkomp) are fixed, at least in sections, and
- by means of bringing into relation, at least in sections, the desired course with the theoretically determined courses of the extreme values (Ikomp, Iinkomp) by means of an algebraic specification, a characterizing number (α), corrected for the specific geometry, is formed for the desired layer (06).
A print unit with at least two cooperating rollers (01, 02, 11, 12, 16), wherein at least one of the rollers (02, 11) has an elastic layer (06) on its surface, and the other roller 01, 12, 16) has a largely undeformable surface, characterized in that the layer (06) has, at least for an area of a relative compression (S*), a characterizing number (α) between 0.980 and 1.000, which describes its elastic properties, wherein the characterizing number is formed by the algebraic specification
- 7 α = I real - I inkomp I komp - I inkomp
- wherein (Ikomp, Iinkomp) represents a number of revolutions ratio for the extreme cases of a purely compressible, or purely incompressible layer (06), and Ireal a desired number of revolutions ratio.
A print unit with at least two cooperating rollers (01, 02, 11, 12, 16), wherein at least one of the rollers (01, 02, 11, 11, 12, 16) is driven by a drive motor (13), which is mechanically independent of the other roller (01, 02, 11, 12, 16), and wherein at least one of the rollers (02, 11) has an elastic layer (06) on its surface, and the other roller (01, 12, 16) has a largely undeformable surface, characterized in that the layer (06) and the geometries of the two rollers (01, 02, 11, 12, 16) are alternatingly matched to each other in such a way that in case of a variation at least in a section of the relative compression (S*) of the layer (06), a number of revolutions ratio Ireal deviates from 1.000/n in the range of at most 0.002, wherein n represents the ratio between the number of printed pages in the circumferential direction on the roller (02, 11) with the layer (06) to the number of printed pages on the other roller (01, 12, 16).
A print unit with at least two cooperating rollers (01, 02, 11, 12, 16), wherein at least one of the rollers (02, 11) has an elastic layer (06) on its surface, and the other roller 01, 12, 16) has a largely undeformable surface, characterized in that the layer (06) and the geometries of the two rollers (01, 02, 11, 12, 16) are alternatingly matched to each other in such a way that at least for the area of a relative compression (S*) the differential quotient (dIreal/dS) between the number of revolutions ratio (Ireal) and the compression (S) deviates maximally by 0.01 1/mm from zero.
A device for determining the roll-off behavior of an elastic layer (06), wherein an axial distance (a) between a roller (18) supporting an elastic layer (06) and a roller (17) having a substantially undeformable surface can be changed and a number of revolutions ratio (Ireal) between the two rollers (17, 18) can be determined, characterized in that at least one of the rollers (17, 18) is seated in eccentric bushings (21) in a frame (19).
A device for determining the roll-off behavior of an elastic layer (06), wherein an axial distance (a) between a roller (18) supporting an elastic layer (06) and a roller (17) having a substantially undeformable surface can be changed and a number of revolutions ratio (Ireal) between the two rollers (17, 18) can be determined, characterized in that a change in the axial distance (a) can be detected by a path-measuring device (28) on a lever (22) which transmits the movement of the roller (17).
Dependencies are inferred from the claim text.