摘要:
The invention relates to a method and apparatus for setting register on a multicolor printing machine (1) having color printing units (6, 6null, 6null, 6null) allocated to various printing inks and having image cylinders (2, 2null), equipment (3, 3null) for producing images, in particular electrostatic latent images, on the image cylinders (2, 2null, . . . ), a carrier (4) for printing substrates (15) and image transfer points (5, 5null, 5null, 5nullnull) for the transfer of the color separations (7, 7null, . . . ) from the color printing units (6, 6null, 6null, 6nullnull) to the printing substrates (15), an allocation of the image productions (11, 11null) on the image cylinders (2, 2null, . . . ) to the printing substrates (15) being carried out in order to achieve coincidence of register of the color separations (7, 7null, . . . ) in the print. Apparatus and methods of this type are to be configured in such a way that a high precision in setting the register can be achieved with a tolerable outlay, in particular as far as possible without reject prints. This is achieved by a time-independent allocation of the positions of the image productions (11, 11null, . . . ) on the image cylinders (2, 2null, . . . ) to the printing substrates (15) being carried out for at least one defined area (10, 10null, 10null, . . . , 10n) of all the color separations (7, 7null, . . . ).
摘要:
The invention relates to a method and apparatus for setting register, with detection of the entry of a printing substrate (2) into a printing machine (1) and calculation of the beginning of digital production of color separations (3, 3null, 3null, 3nullnull) to achieve an in-register position of the color separation prints (4, 4null, 4null, 4nullnull) on a printing substrate (2). By means of the invention, the method and the apparatus are to be developed in such a way that more time is available for calculating the setting values for setting the register. This is achieved by the printing substrate (2) being detected before it enters the printing machine (1) and, following this detection, the relative positions of the color separations (3, 3null, 3null, 3nullnull) being calculated, and by precise detection of the leading edge (5) of the printing substrate (2) being performed as it enters the printing machine (1) and being made the basis for determining the starts of the production of the color separations (3, 3null, 3null, 3nullnull), their relative position having been precalculated.
摘要:
The invention relates to a method and apparatus for correcting register faults in a multicolor printing machine (1) having a number of items of equipment (2,2null, . . . ) for the digital production of color separations (3,3null, . . . ), correction values being determined and assigned to the angular positions (4,4null, . . . ) of at least one image cylinder (5,5null, . . . ) and, as a result, being taken into account for the control of the production of the color separations (3,3null, . . . ) on said image cylinder. By means of the invention, correction values are to be made available for the correction of register faults, which, with a fine graduation, make it possible to assign them to angular positions of machine elements in a repeatable way. This is achieved by circularity errors (6,6null, . . . ; 8,8null, . . . ; 9) of machine elements (5,5null, . . . ; 7,7null, . . . ; 10) which have an influence on the register being determined, assigned to their angular positions (4,4null, . . . ; 13,13null, . . . ; 14) and, from these, the correction values for the control of the production of the color separations (3,3null, . . . ) on the at least one image cylinder (5,5null, . . . ) being determined.
摘要:
A method and apparatus for setting register on a multicolor printing machine (1) having color printing units (6, 6null, 6null, 6nullnull) assigned to various printing inks, at least one image cylinder (2, 2null, . . . ), image production equipment (3, 3null, . . . ) for producing color separations (7, 7null, . . . ) on the at least one image cylinder (2, 2null, . . . ) and a carrier (4) for printing substrates (15). An assignment of the image production points (11, 11null, . . . ) on the at least one image cylinder (2, 2null, . . . ) is carried out in order to achieve coincidence of register between the color separations (7, 7null, . . . ) in the print, by both the production of the image starts (10) and the production of areas (10null, 10null, . . . , 10n) of the color separations (7, 7null, . . . ) set on the basis of the print and the evaluation of register marks (9, 9null, 9null, 9nullnull).
摘要:
The invention relates to a method and apparatus for setting register in a multicolor printing machine (1) having a number of items of equipment (2, 2null, . . . ) for the digital production of color separations (3, 3null, . . . ), the actions of setting up and combining the color separations (3, 3null, . . . ) being controlled, in order to set the register, in such a way that in-register prints are achieved, influencing variables (4, 4null, 4null) which are caused by the printed pages and have an influence on the register being taken into account in setting up and combining the color separations (3, 3null, . . . ) before the onset of a change in said influencing variables. By means of the invention, the method and the apparatus are to be developed in such a way that no interruption of the printing process between two different printed pages (33, 34) is necessary. According to the invention, the object is achieved in that in the event of a register correction resulting from a change in influencing variables (4, 4null, 4null) caused by a printed page, the retroactive influence of the influencing variables (4, 4null, 4null) of the preceding printed page (33) is taken into account.
摘要:
The invention relates to a method, apparatus and a printing machine (1) having a control device (8, 8null, 8null, 8nullnull) for the digital control of an element of the printing machine (1), an assignment (6, 6null) of two non-coincident digital variables (2 and 2null) being carried out. The error of such an assignment (6, 6null) can be kept small in that, for successive assignments (6, 6null), an integer assignment (6, 6null) of small steps (3) of a first variable (2) to a large step (3null) of a second variable (2null) is carried out in such a way that for each assignment (6, 6null) the numerical ratio remains constant or is changed in such a way that the assignment error (4, 4null) never reaches the width (5) of the smaller steps (3) of the first variable (2) in any assignment (6, 6null).