摘要:
A holding unit for a measuring device having a base carrying an inductive charging input, and a side wall formed with openings for infrared data transmission, includes a two-step cover surface including an upper cover surface and a lower cover surface, the lower cover surface being formed with a recess having a contour corresponding to the contour of the measuring device for receiving the measuring device therein, a side wall of the holding unit partly defining the recess formed in the lower cover surface and being formed with openings for infrared data transmission coinciding with the openings for infrared data transmission formed in the side wall of the measuring device when the measuring device is received in the recess, an output for an inductive power supply disposed in a base of the recess formed in the lower cover surface, the output coinciding with the inductive charging input carried by the measuring device when the measuring device is received in the recess, the upper cover surface being formed with two substantially rectangular recesses, one of the substantially rectangular recesses having a contour corresponding to the outer contour of a printer receivable therein.
摘要:
A method of setting the starting time of transverse ink distribution for printing machines, which comprises determining impression-area dispersion on a printing plate and, in conjunction with parameters specific to the printing machine which affect ink dispersion on a printed sheet, calculating an optimum starting time of transverse ink distribution.
摘要:
Color measurement system for offset printing, having a bridge for spanning an original which is to be measured and a color-measuring device movably disposed on the bridge, the color-measuring device comprising a first three-color simultaneous measuring head for densitometric measurement, and a second three-color simultaneous measuring head for colorimetric measurement.
摘要:
Multimachine operating system for remotely controlling printing machines including a central ink density measuring installation, and at least one terminal of a respective remote-control desk terminal electrically couplable to the ink density measuring installation, and a viewing screen terminal visually couplable to the control desk, the at least one terminal constituting one of a plurality thereof respectively assigned to a corresponding plurality of printing machines and couplable to the central ink density measuring installation.
摘要:
A measuring device which is equipped with a number of sensors determines the area coverage of a printing original or printing plate for printing presses. Each individual sensor of the measuring device is calibrated with the air of calibration strips. By means of an additional sensor of the measuring device, a printing-plate and/or printing-original-specific correction calibration and an adjustment to identical values of all sensors are provided. The correction calibration and adjustment are performed by way of a calibration field and a calibration area on the printing plate and/or printing original.
摘要:
To improve the control of the inking process in an offset printing machine, color measuring fields provided on printed sheets are evaluated not as heretofore densitometrically but colorimetrically by means of spectral measurements. Spectral reflections are used to match colors, or color coordinates are calculated from them and compared with corresponding set reflections or set color coordinates. The color deviations obtained in this manner are used to control the inking process. For the stabilization of printing runs the spectral reflections are converted into filter color densities and the inking process is controlled on the basis of these color densities in a conventional manner. The control of the inking process using color deviations and control using color denisty may be superposed upon each other. The process makes it possible to adapt color impressions in delicate locations of importance for the image in the print to the corresponding locations of the proof. Color deviations due to different material properties and other error sources may also be equalized to some extent.
摘要:
A method of monitoring dampening-medium feed in an offset printing machine includes scanning non-printed areas in a region of given inked areas by a device of an opto-electric transducer, and evaluating signals generated by the scanning; and a device for performing the foregoing method.
摘要:
Assembly for influencing inking in printing machines including a color density measuring device, a device for comparing nominal values and actual measured values, at least one electronic computer for linking the measured values with adjustment values, devices for metering ink feed zonewise to a printing plate and having ink metering elements with appertaining adjustment members and feed-back or reply devices, including a plurality of displays assigned to the ink metering elements for representing adjustment values of all ink zone adjustment members, respectively, of a printing unit, said displays providing exact recommendations to an operator of the assembly, before adjustment of the inking zone adjustment members, for adjusting the adjustment members to predetermined positioning nominal values and signaling to the operator absolute adjustment travel thereof both in magnitude and direction and a positioning device having means selective by the operator for following up the ink zone adjustment members individually and of at least one printing unit, respectively, the positioning device being coupled with the displays.
摘要:
A method of positioning a measuring field of a sensor device on a selected region of an outer cylindrical surface of a cylinder in a rotary printing press, includes directing a light spot of a pilot light source into the selected region; storing the position of the light spot on the outer cylindrical surface of the cylinder in a computing/control device; and controlling the sensor device so that it supplies measured data from the selected region, and a device for performing the method.
摘要:
A method of colorimetrically evaluating a sheet printed on both sides thereof by means of a scanning densitometer having a mechanically controlled measuring head which is guided along a print control strip, to be evaluated and which produces a multiplicity of color density values representing color properties of the control strip, which includes assigning respective control strip measurement fields for different colors to respective printed parts on mutually opposite first form and perfector sides of a sheet, and forming a common control strip set out of all of the measurement fields, assigning to the measurement fields abbreviations for each of the respective ink colors in accordance with the colors to be printed, and introducing into a measuring system the color abbreviations assigned to the respective printing colors and to the respective sides of the sheet.