Abstract: There is disclosed a method of feeding a dampening water to a plate cylinder in an offset printing press which is accelerated to, operated at and then decelerated from a predetermined speed for printing. The method comprises the step of programmatically controlling the feeding amount of the dampening water to increase in accordance with the increase in speed of the printing press along a first curve which is predetermined to indicate the relation of the feeding amount of dampening water to the speed of printing press, when the printing press is accelerated. The method further comprises the step of programmatically controlling the feeding amount of the dampening water to decrease in accordance with the decrease in speed of the printing press along a second curve which is predetermined to indicate the relation of the feeding amount of dampening water to the speed of printing press, when the printing press is decelerated.

Abstract: 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 density 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.

Abstract: A method for monitoring the amount of moisture sprayed on a moving material web or a roller across their width, with the width being divided into individual measurement areas includes a measuring step, a storing step and further measuring steps. The measurement is made of local droplet flow of the sprayed liquid in the individual measurement areas, storing the measured values as set values, and again measuring the local droplet flow and comprising it to the set values. The device used includes a counting device and an evaluation unit. The counting device registers droplets of the liquid sprayed on the moving material web in a respective one of the individual measurement areas, and generates a signal per registered droplet which is supplied to the evaluation unit.

Abstract: In a distributing apparatus including a tubular manifold, for an applicator for direct or indirect application of a liquid or pasty application medium onto a traveling material web, notably a paper web or cardboard web, the cross section of the tubular manifold is variable. The adjustment of the manifold permits verying the rate of application of liquid or pastry medium across the distributors width.

Abstract: The invention is a system for a printing press which maintains the density of the colored ink put down on a moving paper web. The system includes a scanning device having a strobe light for illuminating a color patch in a color bar which runs transversely across the web, a camera for photographing the illuminated color patch and a step motor for moving the scanner incrementally across the web. Actuation of the scanner is timed through a microprocessor using input from an optical sensor and encoder. A signal is sent from the camera to a computer which determines the density of the color patch shot. A work station calculates how much the existing ink control console must be adjusted to maintain density and a command signal is sent from the work station to the console to effect the adjustment.

Abstract: A system for monitoring the toner content in ink. The system comprising a light source and a photo-detector disposed in a ink chamber wall, a controller and a display unit. A content-monitoring voltage V1 and an operation-checking voltage V2 are determined from experiments in advance. V1 and V2 are such light source voltages when a predetermined current Ith is obtained from the photo-detector for the minimum and maximum allowable toner contents, respectively. In usual operation in user site, operation of the system is checked with the light source voltage set for V2 in response to a power-on or a reset. Then, a monitoring of the toner content is started with the light source voltage set for V1. In a toner content monitoring, the sensor current is checked to see if it is equal to or larger than Ith.

Abstract: The invention relates to a method for controlling or regulating the coloration in a printing press, in which color metering elements are adjusted with the aid of a control or regulating device, and in which by means of at least one image pickup device associated with the printing press, picture signals are obtained continuously from the printed image and supplied to the control or regulating device. Provision is made so that a plurality of control or regulating algorithms are available for selection to the control or regulating device, and from among these algorithms, as a function of predeterminable parameters, a control or regulating algorithm is automatically selected and used.

Abstract: A description is given of a photoelectric measuring device by means of which the light reflected from a measuring point on a printed product is detected, and the corresponding measured signals are processed for the purpose of indicating quality data. A measuring instrument of this type, having at least one illumination device and measuring channels, is an improvement over the prior art in order to expand its possible uses, with a construction which is cost-effective and stable when handled. In accordance with the invention, this is achieved with an illumination device which has a spectral intensity distribution which corresponds to the number of spectral ranges provided for the irradiation of the measuring point. The light from the sequentially drivable illumination devices irradiates the measuring point. The light reflected from the measuring point is detected and converted into a reflective signal which is processed to determine ink density values.

Abstract: A method of determining the amount of a fountain solution employed in an offset lithography printing system in which a detectable substance is added to the fountain solution and the amount thereof detected in a target such as the ink rollers and/or the image and non-image areas of the printed paper, the amount of the detectable substance being related to the amount of fountain solution employed in the offset lithography process.

Abstract: The invention relates to a method and device for detecting ink or lacquer films on metallic surfaces inside printing machines. In particular, to irradiate the surface with light and sensing of the intensity of the reflected light to detect whether an ink film or lacquer film on a roller has been completely removed by applying a metering element or doctor-blade element. This is achieved according to the invention by the irradiation of the metallic surface or of the film located thereon, and the reception of the light reflected from the surface or the film located thereon is performed at the Brewster angle with respect to the surface normal, the Brewster angle being defined by the refractive index of the material of the film to be determined and that liner polarization of the light is performed at least partially in the plane of incidence, at least in one of the two beam paths.

Abstract: In a stencil printing machine, when quantity of ink supplied into an ink supplying section in a rotary cylindrical drum is smaller than a predetermine value, ink complementing means is driven to supply ink from an ink storing container into the ink supplying section, and when the quantity of ink in the ink supplying section does not reach the predetermined value within an ink-complementing-means operation time, a determination is made that no ink is left in the ink storing container, and a warning signal is produced.

Abstract: A LED radiates light on a plate held on plate cylinder upon receiving a radiation start signal, so as to form an irradiated area on plate. A photo diode (PD) senses substantially only conventional catoptric light reflected from irradiated area and generates the sensed signal representing the conventional catoptric light intensity. A data processing unit computes the dampening volume based on the sensed signal which is stored in storage device 9, storage device 9 then generates dampening volume signal. The LED is held in such manner that an incident angle of the light in connection with the surface of the irradiated area is made at predetermined angle sufficient for changing the conventional catoptric light intensity sensed by PD in accordance with the dampening volume.

Abstract: The wear on printing forms in a printing machine is monitored in that the inking values at certain locations on the printed product are measured. At least two measurement locations are defined on the print image. The first measurement location has a defined tonal value above an upper tonal value, and the second measurement location has a tonal value below a lower tonal value. The printed product is scanned as it leaves the printing unit. The measured inking values at the measurement locations are compared with the setpoint values as defined by the tonal values at the defined locations. If the lower tone signal is below the setpoint signal while the upper tone signal corresponds or exceeds the setpoint inking values, the control unit deduces that the printing plate may be worn. The printed product count may be used as auxiliary information in the wear determination.

Abstract: In a stencil printing device in which printing ink is supplied to the inner surface of a printing drum, and printing paper is pressed onto a stencil master plate sheet mounted on the outer circumferential surface of the printing drum by using a press roller for effecting a stencil printing on the printing paper, there are provided dip switches in the printing drum for identifying the type of the printing ink supplied to the inner surface of the printing drum, and the pressing force of the press roller against the printing drum is variably determined according to the detected type of the printing ink set on the dip switches so that a stencil printing is carried out with a prescribed printing density without regard to the type of ink, in particular the color of the printing ink used with the printing drum.

Abstract: An apparatus and method for use in supplying ink to a printing press includes a motor which drives a pump assembly. A control system varies the rate of operation of the motor to drive the pump assembly through an operating cycle which includes an intake portion or stroke of relatively short duration and a discharge portion or stroke of relatively long duration. A control system varies the rate of operation of the motor in such a manner as to maintain the rate of flow of ink from the pump assembly constant during the discharge portion of the operating cycle. The short duration of the intake portion of the operating cycle is maintained constant with variations in the operating speed of the printing press supplied with ink by the pump assembly. However, the duration of the relatively long discharge portion of the operating cycle of the pump assembly varies with changes in the operating speed of the printing press.

Abstract: A control system (14) for a printing press (12) having a printing cylinder (36a-36d) having an outer surface, a device (90) for determining a reference printing image for the outer surface of the cylinder (36a-36d), and a device (90) for modifying the reference printing image to a subsequent printing image, and a device (90, 45, 46, 48, and 50) for forming the subsequent printing image on the outer surface of the cylinder (36a-36d).

Abstract: A device for stacking selected sheets in an offset manner so as to facilitate print quality measurements. Certain sheets are automatically or manually selected to be offset deposited onto a stack of sheets so that an edge of the selected sheet including a number of printed measuring fields extends beyond other sheets in the stack. A measuring head transversely scans the measuring fields of the selected sheet for print quality measurements while subsequent sheets are stacked in the ordinary manner. Since subsequent sheets do not cover the extending edge of the selected sheet, sufficient time is provided to complete the scanning operation with a single measuring head without interrupting or slowing the normal stacking rate.

Abstract: A method is provided for controlling a water-ink equilibrium on a moving offset plate 2 in an offset copying machine wherein the offset plate is fixed to a rotating cylinder 1. The method includes the step of illuminating a predetermined area 35 of the moving offset plate 2, the density of which is known, with a coherent light source 30 under normal incidence. A portion of the light reflected around an axis perpendicular to the plane of the illuminated area 35 is collected in the focal plane of a convergent optical system 32. The intensity of the collected light is measured at at least one location in the focal plane of the convergent optical system.

Abstract: A method for color adjustment and control in a printing press wherein the density spectra of individual process colors as well as the density spectrum of the color of paper are stored with given fractional percentages. The density spectra of at least one measuring point per ink zone on a printing copy and at respective points on a printed product are then measured. The density spectra measured on the printing copy and the printed product are then expressed as a linear combination of the density spectra of the individual process colors and the density spectrum of the color of the paper multiplied by fractions, the fractions being calculated so that the density spectra of the printing copy and the printed product are approximated through the linear combination. In the case of a deviation of the fractions between the printed product and the printing copy, the positions of the ink keys are adjusted so that a match of the density spectra is achieved.

Abstract: A roll (30) of adhesive worked between two rollers (10, 12) of the gumming device is supplied by feed nozzles (34a, 34b) projecting fine streams of adhesive (35a, 35b) with monitored flow. In case of an increase in the measured viscosity of the adhesive or stopping of the machine on which the gumming device is used, a water-atomizing device (40) allows the viscosity to be reduced and prevents the adhesive from drying out. A dimension of the adhesive roll is monitored and controls regulation of the output of the adhesive-feeding nozzles. The gumming device thereby ensures proper gumming of a strip of paper (2).

Abstract: Method of ink control in a printing press, includes optically measuring fields on sheets printed by the printing press, comparing an actual ink location for each measuring field, which is attained with the aid of the scanning, with a specified setpoint ink location and controlling inking elements of the printing press so as to reduce deviations in inking.

Abstract: A device for measuring a printing control strip printed on sheet or web material by optical devices located within a printing machine having a plurality of printing units disposed one behind the other, including a measuring cylinder located behind a last one of the printing units and having an outer cylindrical surface portion whereover printed sheet or web material is looped, the optical devices being disposed within the measuring cylinder below a location at which a printing control strip on the material is positionable, as the material is looped over the outer cylindrical surface portion of the measuring cylinder, for measuring the printing control strip.

Abstract: A method of determining dampening-medium feed in an offset printing machine includes inking a printing plate of the printing machine so that tinting of areas of the printing plate which are normally ink-free during a production-run process occurs, and feeding a defined quantity of dampening medium and increasing dampening-medium feed, respectively, while detecting a process of ink taking from the tinted areas, which is applicable as a measurement for the dampening-medium feed being adjusted; and a device for performing the method.

Abstract: A defect print detecting device having photographing means for photographing as an image the surface of a printing plate having a pattern to print and mounted on a plate cylinder, which compares reference image data acquired at the beginning of printing using the photographing means with checking image data acquired during printing, thereby determining the quality of the printed matter.

Abstract: A method of determining printing-ink consumption in an offset printing press includes feeding printing ink to an inking unit of a printing press via an ink duct having adjustable ink-gap openings, and via an ink-duct roller which absorbs the ink emerging from the ink-gap openings; determining ink-film thicknesses (s.sub.F) from the ink-gap openings, and ink-strip length (l.sub.F) and ink-strip width (b.sub.F) per unit time from the rotational speed of the ink-duct roller, and calculating therewith the quantity of printing ink supplied per unit time of per number of printed products in accordance with the equationM.sub.F =K.times.s.sub.F .times.l.sub.F .times.b.sub.F .times.fwherein K represents a constant specific to the printing-press and f represents both a function specific to an adjustment of the press and also a function specific to the material, and displaying the determined ink consumption.

Abstract: 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 individu

Abstract: Sheet-fed offset printing machine including a chain delivery and a control console assigned to the chain delivery and including a remote-control device and a sheet deposit structure for controlling quality of a freshly printed sheet during operation of the printing machine, the control console being actuable for effecting a test sheet withdrawal, the control console with the sheet deposit structure being arranged directly at an end of the chain delivery, as viewed in sheet travel direction, the sheet deposit structure being disposed below a sheet conveying path and a test-sheet outlet, respectively, as an extension of the chain delivery.

Abstract: A movable lifter roller (6) used for transferring the ink from an inking roller (8) to a brayer roller (5) is subdivided into a number of sections (6'). Each lifter-roller section (6') is pivoted on a respective two-armed lever (22). All levers (22) are pivotably disposed on a common axle (28) in such a way that the lifter-roller sections (6') normally rest against the brayer roller (5) and, in the activated state for picking up ink, rest against the inking roller (8). After the return into the position previously assumed, the ink picked up is transferred to the brayer roller (5). For putting the lifter-roller sections (6') into the activated state, there is associated with each individual lifter-roller section a respective electromagnet (31) which a lug (30) of the lever (22) serves as an anchor. All electromagnets 31 are rigidly fastened to a stationary support (33).

Abstract: The invention relates to a method for automatically controlling the water feedrate on a lithographic press which includes a blanket cylinder, a plate cylinder, inking rollers and dampening rollers. The temperature of the fountain solution is regulated so as to be constant. The alcohol concentration is regulated so as to be constant. The ink film thickness on one of the inking rollers is sensed to provide a signal proportional to that variable. The sensing of the ink film thickness on the inking roller is used to determine the water feedrate to the plate cylinder and the rate of water feed is dependent upon the ink film thickness.

Abstract: In a method for controlling ink density, control deviations of ink density are alternatively utilized for dosing moisture agent amounts and dosing printing ink amounts. The dosing of moisture agent amounts is carried out by the inquiry process and this process is controlled by the comparison of ink densities on control strips with given reference values.

Abstract: The invention relates to a method, a control apparatus and aids for the achievement of a uniform printing result on an autotypically operating multicolor printing press. In addition to solid densities and/or screen dot sizes, selected relationships between solid densities and/or screen dot sizes of different printing colors are determined at measuring patches simultaneously printed within the color zones. If they fall outside of the tolerances associated with them, a corrective intervention is made in the printing process by actuating the regulators of the inking units. For the control of the inking units, the first aid provided, instead of the conventional single color meausring patches, is combination measuring patches which are formed by the overprinting of single color measuring patches.

Abstract: A method for measuring and regulating the amount of printing ink supplied by an ink fountain roller to a vibrator roller includes passing the ink fountain roller past a measuring bar which measures ink thicknesses and angles of duration. This data is then utilized to ascertain a volume of ink transferred with this information being then compared with a pre-selected set point volume. Adjustments to the ink metering gap for each ink doctor blade can then be made so that the ink volume actually transferred will be the same as the set point value.