Abstract: Devices are used for fixing or attaching at least one packing or dressing to a cylinder. A retaining element is located in a channel in the cylinder and retains one end of the dressing or packing. A spring element is also located in the channel and cooperates with the retaining element to exert a required clamping force on the end of the packing or dressing. The retaining element is pivotably supported in the base of the channel and is fixed in the base, while in its clamping portion, by the spring element. This insures that the retaining element will not be inadvertently unclamped from the channel.

Abstract: A cylinder of a printing unit of a rotary offset printing machine has a periphery and an axial length. The peripheral surface of the cylinder is divided, in the axial length, into at least three sections that are positional next to one another. The peripheral surface has, in at least three sections, at least one slot-shaped opening. At least two of the sections each have two openings which are arranged offset with respect to each other about the periphery of the cylinder. The cylinder is intended for use in a cylinder pair including a 6/2 printing cylinder and an associated transfer cylinder.

Abstract: The printing cylinder such as a rubber blanket cylinder of a web fed offset printing machine is provided. The printing cylinder includes a rotatable clamping mechanism in a clamping channel. A side of the clamping channel is configured so as to be movable such that the clamping channel can be opened by turning the clamping mechanism. When the clamping channel is open, the ends of the rubber blanket can be inserted. The clamping channel can then be closed by turning the clamping mechanism in the opposite direction such that the ends of the rubber blanket adjoin one another.

Abstract: A device for processing a printing substrate (22), having at least one processing tool (10), in particular a die plate or a perforating knife, which is accommodated on a rotatable carrier body (14); the carrier body (14) being at least partially provided with a magnetizable coating (16) which, when magnetized, holds the processing tool (10) on the carrier body (14) by the action of magnetic force. The device can be used to advantage in a print finishing machine, a printing press, or in a folding apparatus of a web-fed printing press.

Abstract: To provide a device for fixing a covering to a printing-unit cylinder in which, while implementing a narrow gap in the cylinder circumferential surface, the legs of the covering can be tensioned easily and reliably, a spindle bears a trailing channel edge of a tension channel the trailing channel edge can be moved away from the leading channel edge by pivoting the spindle.

Abstract: A plate cylinder adapted for a rotary printing press has a cylinder jacket and a recess followed by a clamping channel which extend at least approximately parallel to the rotational axis of the plate cylinder inside the cylinder jacket. The printing plate has a leading end and a trailing end which are both secured inside the recess. A trailing end region of the printing plate includes two parallel bent edges extending transverse to the rotational direction of the plate cylinder. One bent edge is formed by a section of printing plate fitting against the cylinder jacket and another section of the printing plate that projects into the clamping channel which together enclose approximately a right angle. The other bent edge is formed by the section of printing plate projecting into the clamping channel and an end section of the printing plate extending through the clamping channel.

Abstract: A printing group of a rotary printing press includes at least one forme cylinder and at least one transfer cylinder. The forme cylinder has at least two printing forme end receiving channels. These two channels are spaced circumferentially. At least one of these forme cylinder end receiving channels rolls off against a channel in the transfer cylinder. One of the forme cylinder end receiving channels is at least partially covered by a printing forme carried by the forme cylinder.

Abstract: A plurality of curved plates which are adapted to be mounted on an embossing roll are identically engraved with an embossing pattern that matches the plate dimensions, permitting them to be interchanged or replaced without disrupting pattern discontinuity. In one embodiment, the pattern is created to match a given plate by laying out a skew grid matching plate corners, and using grid parallelograms as pattern unit cells. In another embodiment, an existing doubly periodic pattern is minimally distorted to match the plate geometry.

Abstract: A multipart printing press cylinder. A pair of hubs have an inner bore for mounting on a press shaft. Each hub is made in two parts which may be positioned about the press shaft and attached to each other by, e.g. screws. Each hub has a profile section. A pair of partial shells each include a pair of cylinder frames having a profile matching a hub profile. Manually releasable latches are provided for holding each partial shell on the hubs when the partial shell profiles are mated with the hub profiles. The outer perimeter of each cylinder frame has a radius and contour defining the outer size and shape of a printing press cylinder. A surface material, e.g. sheet aluminum, is formed to fit the frame perimeters and are preferably attached under tension to the frames.

Abstract: A printing group of a rotary printing press includes at least one forme cylinder and at least one transfer cylinder. The forme cylinder has at least two printing forme end receiving channels. These two channels are spaced circumferentially. At least one of these forme cylinder end receiving channels rolls off against a channel in the transfer cylinder. One of the forme cylinder end receiving channels is at least partially covered by a printing forme carried by the forme cylinder.

Abstract: A photosensitive device has a cylinder, a photosensitive sheet slidably wrapping outer surface of the cylinder, and a feeding roller in the cylinder. The feeding roller feeds the photosensitive sheet to the outer surface of the cylinder sequentially. The photosensitive device also has a winding roller in the cylinder. The winding roller rolls the photosensitive sheet sequentially from the outer surface of the cylinder. The photosensitive device also has an adjusting member for adjusting contact force emerged between the cylinder and the photosensitive sheet.

Abstract: A low profile linear movement lock-up system that uses a rack-and-pinion gear mechanism to open and close a sliding jaw to selectively tighten and loosen a print carrier sheet on a print roll. The rack-and-pinion gear mechanism includes a sliding cam with diagonal cam slots and locking clip with pins that slide within the cam slots to open and close the jaw. The rack-and-pinion lock-up device may be configured for installation on a print roll, either in a new machine or in a retrofit application. The rack-and-pinion lock-up device may also be deployed within a print roll, or as a printing machine including a print roll with a rack-and-pinion lock-up device. An existing printing machine may be retrofitted by replacing its existing lock-up system with the rack-and-pinion lock-up system.

Abstract: A method for mounting a printing master on a printing form cylinder includes readying a new print job with a printing-image length by releasing an unwinding spool, activating an unwinding spool drive for moving the printing master a length in circumferential direction of the cylinder on the circumferential surface by drawing the printing master to a rewinding spool and braking the unwinding spool for building tension. A preceding job image start is located on the surface facing the rewinding spool. A control device activates the unwinding spool drive and, before activation, data is produced in the control device regarding the length to be spooled forward, and the spools are fixed, after advancing the printing master a length, for insuring tension. A value is determined for the printing master length to be spooled forward, being at most the printing image length of the preceding print job plus a printing image spacing.

Abstract: A sheet member holding apparatus which holds a winding direction end portion of a sheet member that is wound around a rotary body. Centrifugal force generated by rotation of the rotary body is efficiently utilized to hold the end portion securely and prevent looseness or the like of the sheet member, because the holding apparatus is designed such that the expression {(?1+?2)×(L2/L1)×m}>c×r×t is satisfied. L1 is distance from a fulcrum to a clamp section, L2 is distance from the fulcrum to a center of gravity, m is mass of a plate of the apparatus per unit length in the rotary body's axial direction, t is thickness and c is density of the sheet member, and ?1 and ?2 are coefficients of friction between the sheet member and, respectively, the clamp section and the rotary body.

Abstract: A device is provided for securing at least one leading end and at least one trailing end of at least one packing on a cylinder of a rotary printing machine. The cylinder is provided with an axially extending channel. The leading end of the packing is bent at an acute angle and can fit into a nose configurement between the channel wall and the cylinder's peripheral surface. A securement element, that has a one-armed lever, is located in the channel and secures the trailing end by clamping it using a spring force. The channel has only one securing device in the peripheral direction.

Abstract: In order to manufacture a cylinder of a rotary printing machine cost-effectively, its cylinder body is assembled from a cylinder casing and a first and second side part located at the ends of the cylinder casing, one and the same first and second side part being capable of being completed in order to produce different cylinders casings of different outside diameters.

Abstract: A plate cylinder and printing plate holder for the cylinder is provided, which is capable of adjusting relative positions of plural printing plate holders and fixing the printing plate holders on the plate cylinder without causing misalignments of images among printing plates held by the printing plate holders even after overprinting. A plate cylinder (2) is equipped with at least two printing plates (P) wrapped around the outer circumference thereof. The plate cylinder comprises printing plate holders (6, 7) provided each per printing plate (P) for holding the printing plates (P) on the outer circumference of the plate cylinder. The printing plate holders include one printing plate holder (6) provided in a stationary state and fixed against the plate cylinder and other printing plate holders (7) provided adjustable to move in the circumferential direction of the plate cylinder (2) and fixable against the plate cylinder.

Abstract: A cylinder of a rotary printing machine has at least two axially extending cylinder channels on its peripheral surface. These two cylinder channels are offset circumferentially at an angle which is determined depending on the inherent bending frequency vibration fvib of the cylinder.

Abstract: A cylinder covering (10) is described, having a lateral edge reinforcement (12), which is received partially overlapping on the cylinder covering (10), the cylinder covering (10) having an upper side (14) as the printing side, which is distinguished in that the lateral edge reinforcement (12), on the part (16) not overlapping with the cylinder covering (10), has at least one projection (18) having a projection terminus (20) on a lateral surface, which faces toward the upper side (14) of the cylinder covering, of the lateral edge reinforcement (12), the perpendicular from the projection terminus (20) on the plane of the overlapping part of the cylinder covering (10) running at least partially outside or precisely on the contour of the lateral edge reinforcement (12).

Abstract: A plate cylinder has a cylinder body having a cylinder body outer surface for a first image to be printed and a first end, and a shell having an inner surface circumferentially disposed about the first end and having a gap for holding a printing plate, the shell being axially and circumferentially moveable with respect to the first end and having a shell outer surface for a second image to be printed, the inner surface having at least one projection directed inwardly, the gap extending into the projection.

Abstract: A rotating drum in which, when the rotating drum is rotated at high speed, there is no offset between divisional drum parts, there is little imbalance, and a moment of inertia for rotation is small. A drum main body is divided into four drum parts whose cross-sectional configurations orthogonal to an axis are fan-shaped. Female projecting portions and male projecting portions are formed at a pitch dimension having a predetermined fit-together tolerance. Thus, the drum parts can be assembled together with a certain amount of leeway at a time of assembly. After the four drum parts have been assembled together, wires are press-fit in from an end surface side of the drum main body so as to tightly fasten the drum parts. Because the assembled drum main body defines configurations of the drum parts to have point symmetry, imbalance can be made small.

Abstract: The clamping device is used to adjust at least one register element in a printing machine. The device has an upper clamping rail, to which the register element is fixed. The upper clamping rail can be moved in a guide and fixed in position in order to adjust the register element.

Abstract: An apparatus for clamping the trailing edge of a supply of recording media on the external drum of an imaging system. The trailing edge clamping apparatus includes a plurality of magnetic clamp sections. Each magnetic clamp section includes: a body having a top portion and a pair of legs, wherein a bottom surface of each leg forms a clamping surface of the magnetic clamp section; a plurality of apertures formed in the top portion of the body for receiving a corresponding plurality of lift pads of an actuating system; a set of permanent magnets mounted to an underside of the top portion of the body; and a cover for encapsulating and protecting the set of permanent magnets, wherein the cover includes a raised portion for accommodating the set of permanent magnets, and a pair of flanges for securing the cover to the underside of the top portion of the body.

Abstract: A plate-mounting member to be attached to a plate front end of a flexible plate in order to mount said flexible plate having a plurality of fixing holes onto a plate cylinder including a plate front end clamp mechanism having upper and lower teeth and at least two positioning pins disposed between upper and lower teeth, said plate-mounting member comprising a base and a plurality of fixing pins disposed on said base to be respectively inserted into said plurality of fixing holes formed in said plate front end, wherein said base is to be attached to said positioning pins disposed in said plate front end clamp mechanism to thereby position said plate front end. Also disclosed are method and apparatus for mounting a flexible printing plate.

Abstract: A cylinder can receive one or more packings which are held in proper register. One or more register elements are carried by support strips which are placed in the cylinder barrel. These register elements can be held against longitudinal displacement in the cylinder barrel by a clamping device that is operable from the end face of the cylinder. The clamping device includes a clamping assembly which is useable to hold the register elements in place.

Abstract: A proof press for the mounting of flexographic printing plates, comprising a printing cylinder, which is covered by a blanket for the mounting of at least one printing plate with double adhesive tape interposed, the printing cylinder being movable at right angles to its own axis in order to be placed in contact, along a generatrix, with a respective impression roller for performing proof prints, an optical system for collimating points of the impression roller with respective points of the printing plate by direct viewing, and a compression device for producing the forced adhesion of the printing plate to the double-adhesive tape and to the blanket.

Abstract: A device that is useable to clamp a rotatable shaft or spindle and which is provided with cams or pressure pieces, to retain or to tension packings on a cylinder, is provided. The shaft or spindle can be both rotated about an axis of rotation, as well as clamped against rotation by the device. The device can be pivoted with respect to the shaft or spindle about a pivot axis which is essentially perpendicular to the axis of rotation of the shaft or spindle. The pivotable device can be provided as a pawl or lever that interacts with a pair of stops to hold it in a shaft or spindle locking position.

Abstract: A magnetic plate retention system especially suitable for use in retaining a lithographic plate material to a conventional plate cylinder utilizes one of more elongated retention devices selectively positioned anywhere along the outer circumferential surface of the plate cylinder parallel to the axis of rotation of the cylinder. The retention devices are applied, removed, and retained with an application/removal assembly.

Abstract: A computer-to-plate method and apparatus is described for imaging media sleeves by employing a laser-based imaging head in conjunction with a two stage mandrel comprising an expandable arbor and an intermediate sleeve. Most of the bulk of the mandrel is contained in the expandable arbor, which may be expanded hydraulically to mechanically engage the intermediate sleeve. The media sleeve to be imaged is mounted on the intermediate sleeve by conventional means. The method and apparatus of the invention makes possible the rapid changing between different sizes of media sleeves without requiring the handling of bulky mandrels and without endangering the precision optics imaging head of the apparatus, while maintaining the mounting precision.

Abstract: A device for fixing a flexible plate having angled or beveled suspension edges to a cylinder utilizes a plurality of fastening elements located in a cylinder groove situated radially inwardly of a fastening slit. The fastening elements are engageable with the suspension legs under the influence of spring forces. Separate fastening elements can be used to engage the leading plate suspension leg depending on the direction of rotation of the cylinder.

Abstract: A sheet member holding apparatus which holds a winding direction end portion of a sheet member that is wound around a rotary body. Centrifugal force generated by rotation of the rotary body is efficiently utilized to hold the end portion securely and prevent looseness or the like of the sheet member, because the holding apparatus is designed such that the expression {(&mgr;1+&mgr;2)×(L2/L1)×m}>c×r×t is satisfied. L1 is distance from a fulcrum to a clamp section, L2 is distance from the fulcrum to a center of gravity, m is mass of a plate of the apparatus per unit length in the rotary body's axial direction, t is thickness and c is density of the sheet member, and &mgr;1 and &mgr;2 are coefficients of friction between the sheet member and, respectively, the clamp section and the rotary body.

Abstract: A rotary offset printing press which has a series of printing units of identical make through which a web of paper is threaded. In each printing unit the blanket cylinder is made displaceable into and out of printing engagement with the plate cylinder and the impression cylinder. The cylinders of each printing unit are driven from a separate variable-speed motor via a train of gears which stay intermeshed whether the blanket cylinder is in or out of printing engagement with the other cylinders. A clutch is inserted between the drive linkage and the impression cylinder for connecting and disconnecting the latter to and from the former. A plate change is possible in any of the printing units by moving the blanket cylinder out of printing engagement with the plate cylinder and the impression cylinder, and declutching the impression cylinder from the drive linkage, in that printing unit while the other printing unit or units are in continuous operation for printing the web.

Abstract: Front end clamps are disposed on the cylindrical surface of a recording drum, and rear end clamps are attached in any of a plurality of positions at the cylindrical surface of the recording drum. A controller controls a front end clamp opening/closing device to open the front end clamps and controls a pair of rollers to feed a plate held on a plate carry-in path. The controller also controls the front end clamp opening/closing device to close the plate fixing portion of the front end clamps to fix the front end of the plate on the cylindrical surface, controls a driving device to rotate the recording drum for a predetermined amount, and controls a rear end clamp attaching/detaching device to attach the rear end clamps to the cylindrical surface to fix the rear end of the plate on the recording drum cylindrical surface.

Abstract: A method of exchanging a printing cylinder sleeve in a printing machine, which printing machine comprises a central cylinder and a plurality of ink units adapted to be adjusted against the central cylinder, each ink unit comprising a plate cylinder having a printing cylinder sleeve mounted on a mandrel, and a detachable bearing for supporting the mandrel, the method comprising the following steps, which are performed while the printing machine is running: moving the plate cylinder away from the central cylinder to such an extent that a space formed between the plate cylinder and the central cylinder becomes large enough for gripping the printing cylinder sleeve, detaching the bearing, and withdrawing the printing cylinder sleeve axially from the mandrel.

Abstract: An image recording apparatus comprises a rotary drum for attracting a recording medium to the surface thereof on which a plurality of through holes are formed, the rotary drum for attracting the recording medium via the plural holes by reducing pressure therein, a laser head for emitting a laser beam toward the recording medium on the rotary drum to record an image thereon; and a dummy sheet having an attracting area in which a plurality of through holes are formed, the area having a size substantially equal to the recording medium, the dummy sheet placed between the recording medium and the surface of the rotary drum such that the recording medium is placed on the attracting area and such that the plural through holes of the attracting area and the plural through holes of the rotary drum are superposed.

Abstract: A method for producing sleeves for mounting flexographic printing plates, in which a flexible layered sleeve structure (1) is formed, selected parts (7) being removed from a first (4) of its layers, namely that which is to adhere to a printing cylinder, to leave empty regions for receiving double-sided adhesive tape for fixing the sleeve to the printing cylinder.

Abstract: In order to reliably tension the legs of the carrier plate by means of tongues fastened to spindles, one spindle is designed as a hollow spindle which is mounted in a bore of the cylinder gap of the printing-unit cylinder, and the other spindle is mounted in the hollow spindle.

Abstract: A cylinder for receiving a printing form, the cylinder being formed with a gap having gap edges, which projects into the interior of the cylinder, the gap extending in a direction of generatrices of the cylinder and serving for guiding ends of a printing form therethrough, includes device for tautening the printing form on a jacket surface of the cylinder, at least one of the gap edges having a curvature for attaining tensioning forces which are constant over at least approximately the entire width of the printing form.

Abstract: A device for holding a printing plate comprises guide frames having a storing space for storing a discharged printing plate discharged from an upper plate cylinder a guide member an actuator for moving the discharged printing plate discharged from the upper plate cylinder between an operation position for storing the discharged printing plate in the storing space and a shelter position released from the upper plate cylinder and a hook element for holding the discharged printing plate in the storing space, a downstream side of the storing space located at the shelter position along a discharged printing plate storing direction is lower than an upstream side thereof and the downstream side of the storing space located at the operation position along a discharged printing plate storing direction is higher than the upstream thereof in order to pick-up/insert a discharged/new printing plate easily.

Abstract: A device for fastening printing forms (10) on printing form cylinders (1) of rotary printing presses. The printing forms (10) extend into a clamping channel (3) with their leading edge (12) and their trailing edge (13) and are tensioned therein, via clamping elements, on the lateral surface (2) of the printing form cylinder (1) in a circumferential direction of the printing form cylinder (1) and retained in the clamping channel (3). The clamping elements are accommodated on a tensioning shaft (6) which is rotatably inserted in a bore of the printing form cylinder (1). The clamping elements are designed as spring elements (16, 27) in Y-shape (21), including a first and a second resilient section (17, 19).

Abstract: Device for holding a flexible printing form along the circumference of a printing form cylinder, so that a leading edge of the printing form engages beyond a leading edge of a clamping channel extending across the circumferential surface of the cylinder, comprising at least one resilient holding element secured to an actuatable clamp shaft for fixing a trailing edge of the flexible printing form, said holding element being a spring element that is engageable behind the trailing edge of the printing form with play when the clamp shaft is actuated; a printing form cylinder having the holding device; a printing unit of a rotary printing machine having the holding device; and a printing unit of a rotary printing machine having a printing form cylinder including the holding device.

Abstract: Lock-up assemblies clamp a flexible print plate to a circumferential surface of the print plate cylinder. Preferably, the print plate lock-up assemblies are adapted to being received within a gutter of a print plate cylinder and include an elongate support bar assembly, and a jaw assembly supported by the support bar assembly and adapted for positionally clamping a print plate to an exterior circumferential surface of the print plate cylinder. Preferably, the jaw assemblies include a pair of retainer blocks which are spaced from one another along the support bar assembly, and a jaw support plate positioned between the pair of retainer blocks and adapted for movement along the pair of retainer blocks towards and away from the support bar. A pair of mirror-imaged jaw members is positioned upon and supported by said jaw support plate.

Abstract: The invention concerns a device for assembly of tubular cylindrical carriers (8) on the circumference (22) of carrier cylinders (1) of drums or cylinders, wherein for the assembly of the tubular carrier (8) on the lateral surface (22) a pressure medium acts upon the latter. By attaching an assembly aid (4), on which a tubular carrier (8) can be held, on the carrier cylinder (1), a pressure medium acts upon the latter, so that positioning of the tubular carrier (8) is made possible.

Abstract: A flexible printing plate with bent suspension legs is secured on a cylinder of a printing press by utilization of a base body located in a cylinder groove. The base body supports flexible clamping elements which can engage the suspension legs. The base body may be formed by a plurality of short base bodies to facilitate removal and replacement of the base body.

Abstract: A device for fixing a flexible plate having angled or beveled suspension edges to a cylinder utilizes a plurality of fastening elements located in a cylinder groove situated radially inwardly of a fastening slit. The fastening elements are engageable with the suspension legs under the influence of spring forces. Separate fastening elements can be used to engage the leading plate suspension leg depending on the direction of rotation of the cylinder.

Abstract: A variable-diameter cylindrically-shaped body includes a plurality of first tapered elements and a plurality of second tapered elements interacting with the first tapered elements and movable axially with respect to the first tapered elements. The first and second tapered elements define an outer surface of the body, with the outer surface having an effective diameter variable as a function of axial movement between the first and second tapered elements. The body has particular applicability in printing presses.

Abstract: A device for clamping and/or jamming flexible plate beveled suspension legs in a fastening slit of a cylinder of a rotary printing press utilizes a three-armed pivotable profiled strip. This strip is positioned in a cylinder groove and a first arm of the strip can be pivoted by an inflatable air hose. A second arm of the strip can be pressed against a suspension leg in the fastening strip. A third arm of the strip carries a jamming roller that can engage the flexible plate's other suspension leg.

Abstract: A flexible image transfer blanket is provided which has a non-extensible backing which is easy to mount onto conventional blanket cylinders, which requires no packing (but which can be used with packing), which does not need to be retensioned during operation, and which prints to the gap better than conventional fabric-reinforced blankets. The image transfer blanket is adapted to be mounted onto a blanket cylinder and includes first and second ends, with at least one of the first and second ends being adapted to be inserted into an axially-extending gap in the blanket cylinder. The blanket includes a image transfer surface layer, at least one woven fabric ply, and a non-extensible base layer. The at least one woven fabric ply includes both warp and weft fibers, with the weft fibers being oriented so that when the blanket is mounted on the blanket cylinder the weft fibers extend circumferentially about the blanket cylinder.

Abstract: A device for positioning and tensioning a cylinder dressing on a printing-machine cylinder, wherein both a leading dressing end and a trailing dressing end of the cylinder dressing are tensioned, includes, in a first step, tensioning both dressing ends, and in a second step, relieving the tension in a first of the two dressing ends, while retensioning a second of the dressing ends; and a printing machine provided with the device.

Abstract: A printing press has a support arm that can move between lower and upper positions, first and second link plates swingably supported by a main frame and the support arm, respectively. A connection pin having a protruding end portion is provided to connect the link plates. A support lever, swingably supported by the main frame, has an engagement groove which disengageably engages with the protruding end portion of the connection pin. When the support arm moves from the lower position to the upper position, the protruding end portion of the connection pin comes into contact with the edge surface of a lower portion of the support lever, and swings the support lever. When the protruding end portion of the connection pin reaches the engagement groove of the support lever, the protruding end portion engages with the engagement groove, so that the support arm is held at the upper position.