摘要:
A method for de-imaging a permanent image on a surface of a rewritable printing forme includes driving the printing forme in rotation about its longitudinal central axis during erasure. The image is ground off the surface of the rewritable printing forme by a rotating grinding device set against the surface of the printing forme being driven in rotation. Polymer removed during grinding at the surface is extracted from the surface of the printing forme.
摘要:
A printing unit includes a press unit having a forme cylinder, a transfer cylinder, an inking unit and, preferably, a damping unit. The inking unit of each press unit applies printing ink to a forme cylinder of the respective press unit in such a way that a ductor roll of an inking unit picks up printing ink kept ready in an ink fountain and applies it to the forme cylinder of the respective press unit by a film roll interacting with the ductor roll, inking unit rolls arranged downstream of the film roll, and at least one ink applicator roll rolling on the forme cylinder. Inking unit rolls driven in rotation and inking unit rolls driven in oscillation are are driven independently from one another on the drive side.
摘要:
A deliverer module for a folder of a press includes a paddle wheel which receives products from the folder and subsequently deposits the products on a deliverer belt. At least the paddle wheel is displaceable in the horizontal and/or vertical direction relative to the folder.
摘要:
An image fixing device inductively injects thermal energy into a rotating printing form of a press for fixing an image formed on the rotating printing form by means of a digital imaging system. The fixing device has at least one inductor with at least one induction loop, a high-frequency part that forms a tuned circuit with the inductor, and a supply part that can be coupled to the inductor by means of supply lines suitable for high frequency. The inductor loop is in an elongated form aligned parallel to the circumferential direction of the rotating printing form, with the effect that the zone of energy transfer and therefore the heating zone can be configured specifically in terms of its spread in the printing form, so that a high flux density can be introduced zonally into the printing form at the point which is to be heated.
摘要:
A printing image is provided on a rewritable surface of a printing form within a press. The steps of providing the image, including erasing the surface, generating the image on the surface, fixing the imaged surface, and conditioning the imaged surface, are carried out in a section-by-section manner over the entire surface, and all the steps, or sub-combinations of the steps, may be carried out in parallel. In the apparatus for producing the printing image, the devices for erasing, imaging, fixing, and conditioning may be mounted on a common platform movable along a longitudinal direction of the printing form to allow the steps to be performed in parallel.
摘要:
The invention relates to a sleeve, particularly a rubber blanket sheath, for a printing machine. The sleeve (10) has a two-layer structure comprising an internal layer designed as support layer (11), and an external layer designed as cover layer (12) and used for the print transfer, with the external or cover layer (12) being connected directly to the internal or support layer (11). A three layer composite sheath also is disclosed.
摘要:
In combination with a transport mechanism that includes a plurality of conveyor rollers, an apparatus is used to position a carriage loadable with a wound reel at a desired location on the transport mechanism. The apparatus includes a rotary pulse generator associated with one of the plural conveyor rollers for registering the revolutions of the one of the plural conveyor rollers wherein the revolutions embody a measure of the distance traveled on the transport mechanism by the carriage. The apparatus also includes at least a first and a second initiator for determining the current position of the carriage on the transport mechanism. The first initiator detects a first position of the carriage. The second initiator detects a second position of the carriage. The revolutions of the rotary pulse generator and a distance between the first and second initiator are used to calculate a slip (K), which is used to determine distance (W) between the current position of the carriage and the desired position (S) of the carriage.
摘要:
A printing machine for multicolor printing which includes a plurality of printing units and a system for transporting and guiding either sheet-type or web-type printable matter through the printing units. The guiding system includes means, such as adhesive, contact pressure, or retaining belts, for maintaining the printable matter on a transfer belt in proper registry during transfer through the successive printing units.
摘要:
A web-fed rotary printing unit having a plurality of printing mechanisms is provided. Each printing mechanism includes a form cylinder (1, 5, 16-18, 27-30), a transfer cylinder (2, 6, 3, 7, 12-15, 22-25) and a separate or common impression cylinder (3, 7, 11, 26). Stress torques acting on the drive motors can be eliminated to the greatest possible extent by providing a drive motor that has a drive connection to the further cylinders via the impression cylinder.
摘要:
A folding-aid mark on a folded product, includes a folding mark for identifying the intended course of a fold, and additional lines for identifying the tolerance limits of a predefined tolerance range in the region of the folding mark.