摘要:
Ink duct with an ink metering device for an offset printing or letterpress machine, the ink metering device being in cooperative engagement with a duct roller, includes an ink-duct side part pivotable about the axis of the duct roller and displaceable both perpendicularly and parallel to the duct roller, the ink-duct side part having an end face directed toward the duct roller and being in contact with the outer cylindrical surface of the duct roller, and the ink-duct side part having a lateral surface directed towards the interior of the ink duct and being in contact with a ductor knife in order to prevent ink from escaping from the ink-duct, and means for exerting a force on the ink-duct side part in order to maintain contact between the ink-duct side part and the duct roller.
摘要:
Method for regulating a supply of dampening solution in an offset printing press having a printing plate includes supplying at least one selected region of the printing plate with a well-defined amount of energy; determining and measuring scumming occurring in the selected region; comparing the measured scumming in the selected region with a prescribed scumming matched to the respective supplied amount of energy; and adjusting the supply of dampening solution, if the measured scumming and the prescribed scumming deviate from one another; and a device for performing the method.
摘要:
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.
摘要:
A print control strip which allows the optional use of both solid tone control/regulation and halftone control/regulation, and in which the color control/regulation is optimized on the basis of values derived from the solid tone density and the halftone density from single color and/or multicolor halftone fields. Such print control strips are used for control/regulation of the ink feed in the inking mechanism of rotary printing presses. The print control strip disclosed includes alternating single color solid tone fields for each ink color and single color halftone fields for each ink color, and multicolor halftone fields corresponding to every second color zone. There may also be zonally alternating single color solid tone fields for each ink color and multicolor halftone fields.
摘要:
A device for feeding energy to a cylinder rotationally mounted on a stationary machine part includes a hydraulic pump disposed in the cylinder, and a transmission device located between the stationary machine part and the hydraulic pump, the transmission device being engageable with the hydraulic pump at a drive side thereof for driving the pump.
摘要:
A device for tensioning a flexible printing plate mounted on a plate cylinder of a rotary printing machine having a device for pivoting the printing plate on the plate cylinder so as to provide a register correction, the printing plate having ends which are clamped in tensioning rails, include respective pivot levers via which the tensioning rails are articulatingly connected at both ends thereof, respectively, the pivot levers being pivotally mounted on a cylinder body, and a cam device for tipping and displacing the tensioning rails relatively to one another so that the printing plate is pivotable about a precisely defined pivot point.
摘要:
A method of metering ink in offset printing machines having an ink cylinder with which a metering member adjustable into contact with the ink cylinder with a given pressure is associated, includes varying the contact pressure of the metering member against the ink cylinder as a function of at least one of the viscosity of the ink in a metering gap, the supply of dampening medium and the peripheral speed of the ink cylinder so that a constant specifiable thickness of ink film on the ink cylinder and a constant specifiable intensity of ink impression on the material to be printed is settable, and a device for carrying out the method.
摘要:
A device for ink profile-dependent regulation of dampening medium in an offset printing unit having an inking-dampening unit which, over the width of a type forme, supplies a dampening medium film of substantially uniform thickness to a plate cylinder and to an inking part of the inking-dampening unit includes a hydrophilic measuring roller, measuring means adjacent the measuring roller for determining extent of wetting of an outer cylindrical surface of the measuring roller section-by-section over the width of the measuring roller and for transmitting corresponding signals, means for varying the proportion of dampening medium in the ink film section-by-section, control means for converting the signals from the measuring means into adjustment commands and applying them to the proportion varying means for varying the proportion of dampening solution in the ink film section, the hydrophilic measuring roller being in cooperative engagement with a rubber-covered ink roller, the control means being actuatable in accordance with the signals and through the intermediary of the temperature on the cylindrical surface of the measuring roller for varying the quantity of dampening medium in at least an individual zone of the width of the measuring roller so that the dampening-medium film accepted by the measuring roller from the rubber-covered ink roller is influenced.
摘要:
Folding machine in web-fed rotary printing machines for longitudinally folding, for cross-cutting the paper web and for collecting separated copies on a collecting cylinder cooperating with a knife cylinder, the collecting cylinder having an odd number of puncture rows on the periphery thereof, and the knife cylinder having an even number of puncture rows on the periphery thereof for the longitudinally folded paper web, the improvement therein including means defining the puncture rows firmly built into the collecting cylinder, cutting devices formed alternatingly of a single knife and a double knife respectively located on the knife cylinder following successive section length thereon, said single knife being disposed at a location whereat it leads the respective puncture row cooperating therewith and a device for removing from the puncture rows trimmed strips separated from the copies by the double knife on both sides.
摘要:
Sheet carrier device disposed so as to be axially and radially adjustable on a transfer drum in a multicolor rotary printing machine and having axially shiftable carriers extending in circumferential direction on the casing of the drum, sheet carrier elements being interchangeably mounted on the carriers and displaceable in circumferential direction of the drum, the sheet carrier elements having supporting edges whereon a sheet being carried is supported when the carrier elements are in operating position. In a first embodiment the invention includes lines disposed circumferentially on the transfer drum and having a hook at least one end thereof for hooking the lines into the drum casing, the sheet carrying elements being formed with respective bores through which the sheet carrying elements are threaded on the lines, the sheet carrying elements having a square cross section concentric to the bores formed therein, respectively, and having the respective supporting edge thereof projecting from the square cross section, and a guide band mounted on the casing surface of the transfer drum and shiftable in axial direction thereof, the sheet carrying elements being disposed on the guide band so as to be pivotable through 90.degree.. In a second embodiment the invention includes a guide rod axially mounted on the drum casing, stirrups forming a circumferentially extending circular segment, respectively, and being shiftable in axial direction on the guide rod, the sheet carrier elements being formed with a clamping opening by which the sheet carrier elements are mounted on the stirrups.