摘要:
A device designed as a magazine is disclosed for supplying printing plates to a plate cylinder of a printing machine, in particular to ensure the automatic exchange of printing plates by means of a plate supply arrangement. The plate supply arrangement (16) has several distributed (second) holding means (55) for the printing plates (9) that can be successively activated.
摘要:
Clamping and tensioning device for an inwardly bent trailing edge of a flexible printing plate disposed in an axial gap at the circumference of a plate cylinder adjustable in axial spacing and cooperating with a blanket cylinder, the printing plate being fixable at a leading edge thereof on the plate cylinder and being tensionable in circumferential direction on the plate cylinder, includes two clamping bars displaceably supported in the axial gap and forming therebetween a clamping slot for receiving therein an inwardly bent trailing edge of the printing plate, the two clamping bars extending axially in the gap within the cross-sectional contour of the plate cylinder and being loadable by reversible opposing clamping forces as well as by reversible tensioning forces in common in tensioning direction of the printing plate, and being respectively braced against the plate cylinder, the two clamping bars being formed with radially outer edges, the clamping and tensioning device being radially displaceably disposed in the axial gap of the plate cylinder, and a device for applying drive forces to the clamping and tensioning device for displacing the clamping and tensioning device with the radially outer edges of the two clamping bars radially outwardly at least to the cross-sectional circumferential contour of the plate cylinder, with the clamped bend of the trailing edge of the printing plate being displaceable back within the contour of the plate cylinder.
摘要:
A printing machine having a plurality of printing units, and circumferential and side register adjusting devices for adjusting the register in all but one of the printing units, the one printing unit being non-adjustable, includes a control-command input device operatively associated with the non-adjustable one printing unit for producing a relative change in position of a subject in the non-adjustable one printing of a register adjustment of the one printing unit as a result of logically consistent register adjustments of the printing units having the circumferential and side register adjusting devices, and method of operation.
摘要:
The invention relates to a rotary printing press, particularly offset printing press, the printing unit of which comprises a printing form, a damping unit as well as an inking unit, said inking unit being provided with a set ink profile. In order to obtain a fast change of ink profile, it is proposed that, in order to eliminate the previous ink profile and to prepare the buildup of a new ink profile, the printing form 32 is inked over its entire surface area with the inking unit 1.
摘要:
A method of registration correction by turning a flexible plate about a point on a cylinder of a press, which includes determining data regarding a deviation from registration of a defined register rotation in at least one of a circumferential, side and angular position of the plate from a specimen made from the plate, and issuing adjustment commands initiating adjustment operations in devices provided in the press for respectively turning the plate and for effecting circumferential and side register, the adjustment commands taking into account the determined data, so as to finally correct the register of a pattern produced by the printing plate.
摘要:
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.
摘要:
Safety system for a printing machine having at least one machine drive, a brake device and an electronic control system therefor. The electronic control system has power control stages which permit electronic braking of the drive assembly, and a monitoring circuit, to which can be fed nominal and actual values of the speed of the drive assembly, and which actuate the brake device in the case of impermissibly high deviation between a nominal value and an actual value. Accelerations and decelerations necessary in the operation of the printing machine are achieved by suitable control of the respective machine drive.
摘要:
In combination, a control mechanism for a separately excited DC drive motor, and a device for generating an exciter current to be supplied to a field winding of the motor, includes a measuring device for measuring operational values of the motor, and a device connected to the measuring device for adjusting the exciter current, in accordance with measurement results of the measured values, to a determined value at which a preselected operational characteristic exists, and the exciter current is kept constant at the determined value.
摘要:
An apparatus for measuring angles and/or distances includes a sensing head with sensors for determining absolute values and incremental values. The incremental values are provided between two successive absolute values. The apparatus further includes a scale embodiment, which is assigned to the sensing head, and a device for forming a total absolute value from an absolute value determined by a sensor and an incremental value determined by a sensor and for providing this total absolute value in binary/digital form over the entire operating range. The entire signal processing is therefore carried out in the sensing head, so that the complicated signal transmission can be simplified significantly, and complicated peripheral electronics can be dispensed with. A method of measuring angles and/or distances is also provided.