Abstract: Multiple winding mechanisms are disposed within a single cylinder, such as the plate cylinder of a printing press, and are actuable so as to pay out material across different cylinder segments. For example, the winding mechanisms may be differentially geared to cylinder rotation, such that rotation of the cylinder in a first direction advances material from a first winding mechanism across a first circumferential portion of the cylinder to a second winding mechanism; while rotation of the cylinder in the opposite direction advances material from the second winding mechanism across a second circumferential portion of the cylinder (which may, for example, be diametrically opposed to the first cylinder portion) to the first winding mechanism. Alternatively, material advancement may be achieved by means of a dedicated motor rather than mechanical coupling to cylinder rotation.

Abstract: An arrangement for fastening a covering on a cylinder of a printing machine, the arrangement including a cylinder having at least one axially extending cylinder groove which defines a groove wall at an acute angle to an outer surface of the cylinder, and a covering including at least one flexible support plate having a leading flange and a trailing flange that are inserted into the cylinder groove so that the leading flange engages the groove wall and the trailing flange is adjacent the leading flange. A spindle is arranged in the cylinder groove so as to be rotatable between a release position and a clamping position, and a leaf spring is mounted on the spindle so as to press, in the clamping position of the spindle, the trailing flange and the leading flange against the groove wall.

Abstract: Described is a stamping roller (10) intended for a stamping apparatus, which roller has a central carrier roller (12) and stamping punch portions (24) which are spaced from each other in the peripheral direction, wherein fixed to the carrier roller is at least one punch ring whose two axially mutually spaced edge portions are designed with spacer rings (26) for the defined contact of at least one associated backing roller (28), and the punch ring (20) is designed with the stamping punch portions (24) between the two spacer rings (26). The/each punch ring (20) is matched to the carrier roller (12) in respect of dimensions and material in such a way that the/each punch ring (20) is displaceable on the carrier roller (12) at ambient temperature and at elevated stamping or operating temperature of the stamping roller (10) thermal expansion fixes the/each punch ring (20) on the carrier roller (12).

Abstract: A printed product transfer assembly for supporting and carrying printed product from one station in a printer apparatus to another station includes a transfer structure including a product conveying surface, a blanket including fiberglass having several outwardly protruding fiberglass fibers and being secured snugly over the conveying surface; a flexible resilient material secured snugly over the blanket and engaged against circumferential movement relative to the blanket by the fiberglass fibers, and having several ridges for engaging and conveying the printed products and for cushioning the printed products to prevent marring of printing ink.

Abstract: An adjustment device for adjusting the height of gripper impact strips in a sheet-guiding cylinder for a printing press having two diametrically opposing gripper bars disposed at the cylinder circumference and made up of gripper shafts, grippers and gripper impact strips, includes respective adjusting shafts provided for the gripper impact strips, a coupling connecting the adjusting shafts to one another and compensating for an axial adjusting movement of the adjusting shafts, and an actuating element actuatable from the cylinder circumference for adjusting the height of the gripper impact strip at at least one of the gripper bars.

Abstract: An arrangement for fastening a covering on a cylinder of a printing machine, the arrangement including a cylinder having at least one axially extending cylinder groove which defines a groove wall at an acute angle to an outer surface of the cylinder, and a covering including at least one flexible support plate having a leading flange and a trailing flange that are inserted into the cylinder groove so that the leading flange engages the groove wall and the trailing flange is adjacent the leading flange. A spindle is arranged in the cylinder groove so as to be rotatable between a release position and a clamping position, and a leaf spring is mounted on the spindle so as to press, in the clamping position of the spindle, the trailing flange and the leading flange against the groove wall.

Abstract: In the case of a printing cylinder for a printing plate made of a magnetizable material, a roller-shaped basic body is provided which, on its circumference, has an axial slot for the hanging-in of a bent edge of the start of the printing plate and several holding magnets distributed along the circumference, one wall of the slot being formed of a strip made of a magnetizable material which, inside the slot, is provided with holding magnets used for holding the bent edge of the printing plate.

Abstract: Plate cylinder of sheet-fed printing press is disclosed whose circumference is covered by minute glass beads 14 of approximately uniform diameters in order to decrease a friction force between a plate as well as to prevent the generation of static electricity.

Abstract: A reusable mandrel for use in a plate cylinder of a printing press. The reusable mandrel includes two semi-cylindrical shells spaced slightly apart to form a tube having two opposing longitudinal slots. Disposed inside the tube is a controller that may be activated in order to selectively adjust the diameter of the tube. The tube is preferably set at an initial diameter so that the tube may incrementally accept plate material from a supply mandrel. Thereafter, the controller may be activated in order to decrease the diameter of the tube so that the tube may be removed from a spool of used plate material.

Abstract: A device for stretching the rear edge of a printing plate in the plate cylinder of a rotary printing press. An extension shaft is provided in a channel which extends in the longitudinal direction of the plate cylinder, whereby fastened to the extension shaft are stretching elements which interact with retaining elements and make possible a stretching of the printing plate. Adjustment means are provided on both sides of the extension shaft, which adjustment means are supported on the cylinder cheeks and make possible an extension of the printing plate in the axial direction. The device makes possible, in addition to the extension of the rear edge of the printing plate, a lateral offset by a small amount.

Abstract: A rotary die cutter unit with rapid die connection has a die equipped with connecting bars, and a die-holding cylinder. The die-holding cylinder has longitudinal grooves with openings receiving the bars when connecting the die to the die-holding cylinder. Connecting teeth, which are housed in the openings of the grooves, circumferentially move on the cylinder, and assume a non-connected position in which they are completely moved out from the grooves, and a connected position in which they protrude into the grooves. Control elements corresponding to the grooves are provided, having small irregular teeth with one of the two sides whose height is progressively decreasing in the form of a chute. The control elements, when longitudinally moving, act on roller bearings to gradually move the connecting teeth between their two extreme connected and non-connected positions.

Abstract: The invention relates to a device with an interchangeable leaf for holding a printing plate on a plate cylinder in a rotary printing press, and to a tool for dismantling the leaf. A leaf for fastening an edge of a printing plate onto the external surface of a plate cylinder penetrates into the latter via a slit and is mounted against a flat of a tension bar housed in the plate cylinder through the use of a passage receiving a end region of the leaf, of stop means for retaining the end region in the passage counter to movements other than the movement for extraction via the slit, and an elastic stop piece locking the end region by elastic clipping counter to such a movement but capable of being actuated by means of a flat tool inserted via the slit to release the end region. The mounting and dismantling of the leaf may thus be performed through the slit, without extracting the tension bar.

Abstract: A printing plate end clamping apparatus engages generally Z-shaped beveled plate ends of a printing plate. A pair of spaced plate end securing flanges and a central clamping bar are shaped to cooperatively engage and sandwich the beveled plate ends. The printing plate is secured to the cylinder in a shape conforming manner.

Abstract: A device for fastening a printing packing to a jacket surface of a printing cylinder uses a clamping carriage that is supported in a cylinder trough. The clamping carriage carries a clamping frame having a clamping face which cooperates with a clamping surface on a lateral trough wall. Clamping of the packing is accomplished without disturbing the position of a gripper device located in the cylinder trough. Transfer of the print material sheets free of register errors is made possible.

Abstract: The invention relates to a method and apparatus for mounting flexographic printing plate in registration onto a printing cylinder with a mounting bar and a carrier sheet having the plate mounted thereto. The mounting bar and the carrier sheet each have multiple openings which are located to assure consistent alignment between the bar and carrier sheet. The carrier sheet is secured in registration to the mounting bar by aligning the openings of the bar to the carrier sheet and inserting locking pins into the aligned openings. The method for mounting a flexographic printing plate further includes an apparatus for retaining an end of the carrier sheet to prevent its movement while drilling or punching the multiple openings.

Abstract: A plate clamping system and apparatus for holding a flexible printing plate in position on a rotary printing cylinder. The system includes a plate clamp assembly mounted in a gap in the wall of the rotary printing cylinder for holding the leading edge of the flexible printing plate and a tail clamp assembly mounted in the same longitudinal gap in the cylinder wall for gripping and applying tension to the flexible printing plate to hold it against the surface of the printing cylinder. The plate clamp includes a plurality of individual clamping mechanisms which are air pressure engaged and spring released to hold the leading edge of the flexible plate. The tail clamp assembly includes a plurality of tail clamp mechanisms which are spring applied and air pressure released. The tail clamp mechanisms have a two-stage operation wherein compression springs clamp the tail end of the printing plate and a second set of tension springs moves the mechanism to apply tension on the printing plate.

Abstract: A clamping device for a rotary printing press utilizes a plurality of toothed racks and inflatable tubes to rotate a clamping spindle between press blanket clamping and unclamping positions. A blocking device is utilized to prevent loosening of the blanket when the direction of rotation of the cylinder is reversed. The blocking device prevents the clamping spindle from being rotated in the unclamping direction.

Abstract: For the register of a sleeve-shaped offset priming form in which the beginning and end of the plate-shaped blank of the printing form are connected by a weld seam, a guide element in the form of a projection is provided for the sleeve at the inside of the sleeve. A form cylinder which can be used in combination with the sleeve has a groove extending along its entire width, which groove has a depth that is greater than the height of the projection. The projection can be inserted completely into the groove so that the sleeve can be secured on the form cylinder in the circumferential direction.

Abstract: A plate-clamping apparatus suitable for automatic exchanges of plates and has only a narrow clamping channel. The apparatus includes a tie beam, which has clamping bodies that are elastic in the clamping direction and on the ends of which radial forces can be applied by actuating devices, that is elastically disposed in the cylinder groove.

Abstract: A printing plate lock-up apparatus for a plate cylinder in a printing press comprises a groove defined in the plate cylinder and having an essentially circular cross section, the groove having an opening end opening to the outer periphery of the plate cylinder and having a width in the circumferential direction smaller than the internal diameter, the opening end having one edge engageable with a turned back edge of the printing plate, an engaging member disposed along the groove and having mating surfaces slidably contacting with the inner periphery of the groove for permitting rotation of the engaging member relative to the groove, the engaging member having an engaging hook engageable with a turned back edge, and having a thickness permitting withdrawal and installation through the opening end, and an operation assembly cooperating with the engaging member for operating the latter to rotate within the groove, the operation assembly maintaining an angular phase of the engaging means at least in the position

Abstract: A flat bed printing mechanism for a postage meter is disclosed which includes a flat printing die, a platen mounted beneath the printing which is movable toward and away from the printing die to as to bring the image area of a mail piece disposed over the platen into printing contact with the printing die. The platen supports a resilient pressure pad which contacts the mail piece, and there is a resilient means interposed between the upper surface of the platen and the lower surface of the pressure pad to support the pressure pad in spaced relationship with the upper surface of the platen so that the pressure pad is free to move both linearly and angularly with respect to the platen when the platen moves upwardly to press the mail piece against the printing die, to cause the plane of the upper surface of the pressure pad to conform to the plane of the image area of the mail piece as the platen pushes the image area of the mail piece upwardly toward the printing die.

Abstract: Clamping device for fastening a flexible printing form on a jacket surface of a cylinder includes a structure defining a groove formed in and across a jacket surface of a cylinder for receiving a leading end of a printing form therein, a structure defining a cylinder gap formed axially parallel in the jacket surface of the cylinder for receiving therein a trailing end of the printing form bent with an obtuse angle, a turnable clamping shaft disposed axially parallel in the cylinder and having at least one resilient element fastened thereto, the one resilient element being movable with respect to the trailing end of the printing form, the structure defining the cylinder gap including a leading lateral surface formed in the cylinder and provided with an edge engageable by the trailing end of the printing form, the one resilient element having two legs, one of which, in an unclamped condition of the clamping device, extends freely into the gap.

Abstract: The invention relates to a device for the aligning of printing plates (78) on a printing plate cylinder (10) for a rotary printing press. At least one bore (16) extends through the printing plate cylinder (10) in an axial direction. A movable actuating shaft (26) is disposed in the bore (16). Located in the shaft (26) are a plurality of ring-shaped tensioning and adjustment elements which are spaced apart from one another. The adjustment elements (36) have movable aligning elements/register pins (56) arranged thereon. The invention is characterized in that, for at least one adjustment element (36), an eccentric pin (21) extends between the adjustment element (15) and the register pin (19). The eccentric pin (21) is rotatable to move the register pin (19) along the adjustment element (15).

Abstract: Device for transmitting tensioning forces to a printing-unit cylinder carrying at least one areal flexible packing thereon, the cylinder being formed with an opening extending therethrough in axial direction thereof, and at least one of a leading and trailing edge of the one packing being received in the opening, includes a tensioning shaft disposed in the opening and engageable with the respective one edge of the packing for applying a tensioning force thereto, the tensioning shaft being formed with a journal pin, and an exchangeable adjusting wheel having a bore formed therein wherein at least part of the journal pin of the tensioning shaft is received, the bore having a defining peripheral surface carrying a plurality of supporting bodies thereon, the journal pin of the tensioning shaft being formed at an outer peripheral surface thereof with a plurality of corresponding recesses wherein the supporting bodies, respectively, engage.

Abstract: A lock-up assembly (20) for securing a printing plate (22) on a plate cylinder (10) includes a rotatable lock bar (32) and a spring biased linkage mechanism (36). The linkage mechanism (36) has a first over-center condition in which it rotates the lock bar (32) toward a locked position, and has a second over-center condition in which it rotates the lock bar (32) toward an unlocked position. A movable blocking member (82) blocks the linkage mechanism (36) from switching to the second over-center condition under the influence of centrifugal force when the cylinder (10) is rotating during a printing operation. A hand held tool (40) engages the linkage mechanism (36) to switch it between the first and second over-center conditions upon manual manipulation of the tool (40). The tool (40) also engages the blocking member (82) to move the blocking member (82) from the first position to the second position when the tool (40) is moved into engagement with the linkage mechanism ( 36).

Abstract: The printing apparatus with a forme cylinder which has in its interior a first roller for winding off a printing foil which can be pulled onto the outer surface of the forme cylinder, and a second roller for winding up the printing foil which has been pulled onto the outer surface of the forme cylinder. The forme cylinder has in its outer surface a single opening for a recess into the interior of the forme cylinder. The first roller and the second roller are together arranged in the recess. The printing foil can be wound from the first roller onto the outer surface of the forme cylinder and from the outer surface onto the second roller.

Abstract: A lead edge strip for securing one edge of a flexographic carrier sheet provides improved strength and mounting stability and thus printing accuracy. The edge strip comprises a base portion, a pair of parallel walls extending from said base portion and a short lip for engaging a complementary overhanging edge of a flexographic printing plate cylinder. The carrier sheet is received between the parallel walls and secured there by suitable fastening means. Preferably, the lead edge strip is transparent as this facilitates mounting of the lead edge strip and carrier sheet upon the printing cylinder. The lead edge strip in combination with a carrier sheet is also taught.

Abstract: A cylinder spindle is usable in a device for tensioning bodies on a printing cylinder. The cylinder spindle is divided into a plurality of cooperating spindle segments. These segments are able to be easily removed from the tensioning device through a space between the end of the cylinder and its typically associated bearer ring.

Abstract: Device for sheet-format adjustment of a sheet-transfer drum, formed of sheet-holding elements displaceable in guides in a rotational direction of the sheet-transfer drum and having at least two gripper devices for holding sheet leading and trailing edges, the gripper devices being adjustable relative to one another in an outer cylindrical surface of the sheet-transfer drum in the rotational direction thereof, the sheet-holding elements and the gripper devices being simultaneously adjustable for sheets to be transported on the sheet-transfer drum, includes resilient elements connected to adjacent sheet-holding elements on both sides of the sheet-transfer drum, the resilient elements having substantially identical spring constants.

Abstract: A method and apparatus for mounting flexible printing plates on a forme cylinder utilizes one or more insert bars that are positioned in cylinder grooves. Each insert bar has a pair of tensioning bars which are biased circumferentially toward each other. An inflatable tube is positioned between the tensioning bars and upon inflation will spread plate engaging hooked ends of the tensioning bars apart from each other.

Abstract: A printing plate locking device is designed to facilitate clamping a printing plate to and from a plate cylinder in a rotary press without using any external tools. The printing plate device includes a printing plate tensioning device, arranged in the plate cylinder, which can be engaged with one end of the printing plate to tension the printing plate. The printing plate locking device also includes a lever which is operatively connected to the tensioning device; and a retaining device for holding the lever in a holding position when the tensioning device puts tension on the printing plate. A method of clamping the printing plate utilizes the printing plate locking device structure.

Abstract: The invention relates to an actuating device for clamping arrangements for printing plates in rotary printing presses. The printing unit cylinders receiving the printing plates are provided with at least one opening extending in the axial direction. Through actuating means fastened to the ends of the printing unit cylinder the printing plates can be tightened on the surface of the printing unit cylinder. The actuating means are operable by an actuating unit provided at one end of the printing unit cylinder. The invention is characterized in that the actuating unit (32) includes an overrunning clutch (30) which determines the rotational position of an actuating shaft (9), the actuating unit being spring-biased and comprising an axially movable component (27).

Abstract: A rotatable drum for use in a plotter, or similar device, that provides vacuum for holding the film or other media to the drum's surface, so as to easily accommodate films of various sizes. The drum includes first and second journals and a plate mounted on the circumference of the first and second journals. At least one of the journals has defined on its circumference circumferential channels. The plate has interior and exterior sides, and the first and second journals and a portion of the plate's interior side define a chamber. The plate's exterior side has defined thereon a plurality of grooves. In one embodiment, at least one of the grooves, associated with a first film size, is in fluid communication with the chamber, and some of the remaining grooves, associated with the larger film sizes, are in fluid communication with the channels. A vacuum is supplied to the chamber, and a valve is provided for controlling fluid communication between the channels and the chamber.

Abstract: A circumferentially continuous printing plate, which has the advantage over clamp plates that a clamping arrangement and groove in a plate cylinder can be eliminated, is formed by rolling a flat printing plate into tubular or sleeve form and welding the end edges together, preferably by a neodymium-YAG laser weld, resulting in a narrow, less than 1 mm wide, weld seam (2) having upper and lower concave sides, or by adhering the end edges to an underlay saddle (9), the plate can be coated and imaged when flat or after having been rolled and installed on a plate cylinder (37) of a printing machine. Interengaging projection-and-recess elements (4, 6; 14, 16) are formed on the plate (1, 1') and on the cylinder (37), respectively, to ensure lateral and circumferential register.

Abstract: A device for fastening a flexible printing plate (11) on a form cylinder includes a plurality of leaf-shaped springs (5) disposed in a slot (2) of the form cylinder (1). The springs (5) have two legs (6, 7) which rest in the slot (2), one leg (6) being elongated and tensioning the edges (12, 13) of the printing plate (11).

Abstract: Device for receiving printing forms at one end thereof in a printing-unit cylinder of a rotary printing machine, wherein the printing-unit cylinder is a printing-form cylinder formed with a cylinder gap and having a shaft extending through the cylinder gap, includes a plurality of receptacle components respectively formed with pairs of mutually opposing clamping surfaces disposed on the shaft for gripping a printing form, at least one adjusting element for swiveling one of the surfaces of the respective pairs thereof formed on the receptacle components against a force of a tension spring acting in a tensioning direction, and the other of the surfaces of the respective pairs thereof formed on the receptacle components having a retaining element actuatable by the one adjusting element for swiveling the other of the surfaces against a force of another tension spring, the shaft being an expansion shaft, the receptacle components being individual gripper elements supported side by side on the expansion shaft in a

Abstract: Clamping device for locking a printing plate on a cylinder of a printing press includes two parallel clamping bars formed with respective clamping surfaces, at least one of the clamping bars being movable perpendicularly to the clamping surfaces, and an element for producing a clamping force between the clamping bars, a first one of the clamping bars including at least one leaf spring formed with the clamping surface of the first clamping bar, the clamping surface thereof being cooperatively clampable with the clamping surface of the second one of the clamping bars, the first clamping bar further including a member formed with at least one concave segment-shaped recess, the leaf spring being formed with a corresponding convex segment-shaped protrusion supported in the recess.

Abstract: A plate cylinder of a rotary printing press with a device for adjusting a flexible printing form by a swivelling motion, includes a sleeve adjustable by the adjusting device, the sleeve having an outer cylindrical surface thereon a flexible printing form is mountable.

Abstract: 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 dispos

Abstract: A blanket clamping device for clamping a blanket mounted on a transfer cylinder of an offset rotary printing machine. The blanket is clamped by clamping rails mounted at an angle relative to each other in the clamping duct. In the middle between the clamping rails is arranged at least one screw which is screwed into the body of the transfer cylinder and has a truncated cone-shaped head. The clamping rails each have a step on a surface facing the at least one screw. Movement of the clamping rails out of the clamping duct is prevented by engagement of the steps with the truncated cone-shaped head.

Abstract: A clamping and tensioning rail for the trailing edge of a printing plate is mounted in the cylinder channel of a plate cylinder such that the trailing edge of the printing plate can be introduced in a simple way, without folding, into the gap between an upper and a lower clamping part. The clamping and tensioning rail is mounted pivotably about two pivot axes which are formed, for example, from stops fixed relatively to the cylinder and which interact respectively with an edge and an arcuate recess on the clamping and tensioning rail. Preferably, the clamping and tensioning rail is drawn into a completely open position by the force of a prestressed compression spring and can be pivoted against this force by an actuating shaft via lever arms and straps.

Abstract: A device for actuating a clamping device on at least one paper-guiding cylinder in a rotary printing press, including a positioning unit having a device for applying a pressure medium thereto, a lever mechanism cooperatively engageable with the positioning unit, a device for remotely controlling a clamping device on a respective paper-guiding cylinder through the intermediary of the lever mechanism, the clamping device having a clamping bar and a device for actuating the clamping bar into a clamping mode and into a nonclamping mode, the actuating device being cooperatively engageable with the positioning unit, and spring devices for maintaining the clamping bar in the clamping mode wherein a cylinder covering is clamped thereby on the respective cylinder.

Abstract: A blanket fixing and tensioning assembly which is usable to secure and tighten a blanket on a blanket cylinder utilizes a blanket leading edge fixing and tensioning assembly together with a blanket trailing edge tensioning assembly. The leading edge can be fixed to the blanket and held in place while the blanket is applied to the blanket cylinder and its trailing edge secured and tensioned. The blanket can also be shifted circumferentially on the blanket cylinder to accommodate for blanket wear.

Abstract: A self-locking mechanism (10) for selectively dynamically adjusting expansion bands (12) of a running cylinder (11) of a rotary printing press during rotation includes a cylindrical adjustment member (30, 72) with a diameter substantially the same as the diameter of the running cylinder which engages a band box (22, 80) rotating with the running cylinder (11) to make the selected adjustments in response to rotation of cylindrical adjusting member (30, 72) at a speed different from the speed of the running cylinder (11). The speed difference is produced by a differential (52, 75) stationary with respect to the running cylinder (11) which engages the cylindrical member (30, 72) and the running cylinder (11). The cylindrical adjusting member (30, 72) is mounted to the running cylinder (11) on an interrupted journal (35). The cylindrical adjusting member (30) has an inner engagement surface (38) for engagement with the band box (22) and another engagement surface (39) for engagement with the differential.

Abstract: A plate lockup apparatus for a printing press includes a lockup table, a gripper plate, a cam shaft, a pin, and a compression coil spring. The lockup table is supported on a bottom surface of a gap in a circumferential surface of a cylinder to be movable forward/backward perpendicularly to the axis of the cylinder, and extends in the axial direction of the cylinder. The gripper plate is swingably and pivotally supported on the lockup table such that its gripper surface opposes the lockup table, and is constituted by a horizontal member extending in a circumferential direction of the cylinder and a vertical member extending in a radial direction of the cylinder to have a substantially L-shaped section. The cam shaft is disposed between the lockup table and the wall surface of the gap to be rotatable in the axial direction of the cylinder.

Abstract: An inner blanket securement assembly utilizes spaced inner blanket engaging pins and an inner blanket hold-down device with a hook-shaped holding nose to secure an edge of an inner blanket to a cylinder. The inner blanket is structured using a plurality of inner layers within an outer casing that is closed and bag-shaped adjacent the leading edge of the inner blanket.

Abstract: An object of this invention is to provide an apparatus capable of easily and accurately mounting a plate to a predetermined position of the circumferential surface of a plate cylinder. A safety cover for covering the circumferential surface of a plate cylinder is suspended and is vertically opened/closed by a hydraulic cylinder. A plate reception member and a plate holder are mounted on the safety cover to hold a plate to be mounted on the plate cylinder. In mounting of the plate, the safety cover is opened, and the lower end of the plate is removed from the plate holder and is inserted into a plate lockup device mounted in the plate cylinder. At this time, notches formed at the lower end of the plate are respectively engaged with reference pins formed on the plate lockup device. When the upper end of the plate is inserted into the plate press member, the notches of the plate are fitted on the reference pins by the weight of the plate and the behavior of the plate press member.

Abstract: A printing machine plate cylinder having a plate tensioning slide rail adjustably mounted within a hollow of the cylinder. The slide rail is supported by a plurality of roller ring modules which stably support the slide rail and permit easy and exact movement of the slide rail in any direction in the adjusting plane.

Abstract: A plate roll attached by an adhesive sheet to a printing plate made of a resin. The attached printing plate is easily detached. The adhesive sheet and remaining adhesive are easily removed after printing is finished and the efficiency of the operation of printing is enhanced. The adhesive sheet includes a photocurable adhesive, which loses adhesive ability by curing by irradiation of electromagnetic waves or an electron beam or a water swelling adhesive, which loses adhesive ability by swelling by water. Adhesive sheets for the plate roll comprise supporting sheets, removable sheets and a photocurable adhesive, which loses adhesive ability by curing by irradiation of electromagnetic waves or an electron beam or a water swelling adhesive, which loses adhesive ability by swelling by water.

Abstract: A printing machine plate cylinder having a plate tensioning slide rail adjustably mounted within a hollow of the cylinder. The slide rail is supported by a plurality of roller ring modules which stably support the slide rail and permit easy and exact movement of the slide rail in any direction in the adjusting plane.