Abstract: A method of making printing plates for color newspaper printing almost free from causing color dislocation. The present invention includes an exposure step 12 of directly drawing a desired image on a plate material E from a plate feeding step 11 by laser beam according to image drawing signals from a computer, a development and fixing step 13 of treating the exposed surface to produce a printing plate 5 with the desired image, and a bending and boring step 14 of forming bent edge stoppers 5a, 5b at the two edges of the printing plate 5 for mounting the plate 5 on the plate cylinder 4 and at least one positioning hole 5c for positioning the plate 5 on the plate cylinder 4. In the exposure step 12, pilot marks P in a desired shape are drawn near the two edges of the plate material E at the same time that a desired image T is drawn on the image drawing area Q of the plate material E according to image drawing signals from the computer.

Abstract: A recorded image frame is distorted on the printing plate when image information or image data from a computer is recorded in the form of band strips, with a plurality of image elements dotted on each widthwise dotted line of the band, on a printing plate wound over a drum. The present invention permits an undistorted recording on the printing plate by an arrangement which includes a printing plate wound around a drum in the form of a right circular cylinder, an exposing assembly to record image information in the form of a band strip on the printing plate by means of light beam, a moving mechanism to move the exposing assembly in relation to the drum in the direction of the drum axis--by one band width per revolution of the drum--and a circuit to generate an incline distortion offsetting signal in a sawtoothed pattern having the cycle synchronized with that of the rotation of the drum with the initial writing position on the band as starting point.

Abstract: A recorded image is distorted on a printing plate when an image information for a computer is recorded in the form of a band with a band width of a plurality of image elements on a printing plate wound around a drum. This invention provides an undistorted recording on the printing plate, made possible by an arrangement that has a printing plate wound around a drum in the form of a right circular cylinder, an exposure unit that uses a light beam to record image information in the form of a band on the printing plate, a moving mechanism to move the exposure unit by one band width in the direction of the drum axis in relation to the drum while the drum makes a revolution, an image treating apparatus with the image information stored in the form of a right quadrangle, and an image modulator to rearrange and slant each band of image information readout from said image treatment apparatus by one band width in the opposite direction to the movement of said moving mechanism.

Abstract: A system for making printing plates for newspaper, which can make, with great efficiency, replacement printing plates to be used when a printing face of the printing plate mounted on the plate cylinder of the rotary press is to be changed in part. The plate-making system is built by linearly arranging in series a plate feeder 2, an exposure unit 3, and a developer 5 so that the exposure unit 3 may directly form images on the printing faces of a plate material 12 in accordance with image drawing signals from a computer to make a printing plate P large enough for at least several pages.

Abstract: A photoengraving machine of this invention increases photoengraving speed without unduly increasing size or manufacturing costs of a CPT-type photoengraving machine by decreasing waiting time for form plates transferred from a plate feed section. The machine comprises a plate feed section, an exposure section, a plate discharge section, and a development section to make a drawing on a form plate at the exposure section in accordance with a signal output from a computer. The form-plate feed section has a stocker case for storing form plates and a transfer unit set above the stocker case to be vertically movable for transferring form plates along a guide rail. The exposure section has at least two exposure barrels arranged at intervals, a laser-beam scanning head, a first table on a side of each exposure barrel toward the form-plate feed section, and a second table on a development-section side of each exposure barrels.

Abstract: An exposure drum (11) of a CTP newspaper plate-making apparatus has a width (W) which is slightly greater than a vertical measurement (L.sub.1) of one page of a newspaper, a circumference (L) which is slightly greater than a vertical measurement (L.sub.2) of two pages of newspaper, first and second plate-material engaging pins (13a, 13b) spaced from each other on the cylindrical surface of the exposure drum a distance (L.sub.5) which is equal to 1/2 of the circumference (L), second plate-material suction apertures (14a) in the cylindrical surface spaced from the first plate-material engaging pins a distance (L.sub.7) which is slightly smaller than a horizontal measurement (L.sub.4) of two pages of newspaper, first plate-material suction apertures (14a) in the cylindrical surface spaced from the first plate-material engaging pins a distance (L.sub.6) which is slightly smaller than the vertical measurement (L.sub.

Abstract: A news-printing photoengraving machine of this invention increases photoengraving speed without unduly increasing size or manufacturing costs of a CPT-type photoengraving machine by decreasing waiting time for form plates transferred from a plate feed section. The machine comprises a plate feed section, an exposure section, a plate discharge section, and a development section to make a drawing on a form plate at the exposure section in accordance with a signal output from a computer. The form-plate feed section has a stocker case for storing form plates and a transfer unit set above the stocker case to be vertically movable for transferring form plates along a guide rail. The exposure section has at least two exposure barrels arranged at intervals, a laser-beam scanning head, a first table on a side of each exposure barrel toward the form-plate feed section, and a second table on a development-section side of each exposure barrels.

Abstract: By increasing the printing-plate-making speed in a laser-direct-drawing-from-computer type plate making system, the plate size can be increased without large-scale expansion of the plate making facilities, and the operation time of the rotary press is thereby improved to increase the number of newspaper prints. The invention provides a printing-plate-making method for newspaper printing designed to enable figure-drawing corresponding to drawing image signals from an electronic computer by laser beam. A plurality of laser scanning heads are provided in an electrostatic charging and figure-drawing image signals from the electronic computer to draw similar or different figures on a plurality of plates in parallel. The plates thus drawn are then subjected to a developing and fixing section, an elution section, post-treatment section, etc.

Abstract: A dampening system for a printing apparatus includes a print plate, a printing cylinder contacting the print plate and adapted to supply water to the print plate, a feed device for feeding water to the printing cylinder, and a dampening roller adapted to transfer water from the feed means to the printing cylinder. The dampening roller comprises a roller having a dampening layer composed of a substrate through which is dispersed a plurality of minute hollow bodies. A plurality of the hollow bodies open towards the circumferential surface to form cells for transferring the water from the feed means to the printing cylinder. At least one of the size and the concentration of the hollow bodies dispersed within the substrate is selected depending on the amount of dampening water to be fed to the print plate.

Abstract: A color printing apparatus printing for both sides of printing paper comprises a plurality of printing sections which are arranged at a regular interval in a piled configuration. Each one of the printing section includes a pair of blanket cylinders facing each other which can be moved between their contacting positions and their isolating positions. Every blanket cylinder is connected to a plate cylinder which is connected to an inking unit, or an inking unit and a dampening unit. Each of the plate cylinders is further provided with a fine adjusting means for shifting the plate cylinder along its axis with respect to the blanket cylinder. The shifting operation of the fine adjusting means can easily minimize the printing shears caused by moisture without stopping the printing apparatus.

Abstract: There is provided an inking unit comprising an ink circulating assembly and means for moving a platform on which said ink circulating assembly is provided. The ink circulating assembly includes the ink fountain provided in an ink reservoir, ink outlet means for introducing the ink into the ink fountain, the ink reservoir having an open top and designed to surround the ink fountain from beneath the ink fountain, a screw conveyor arranged along the longitudinal direction within the ink reservoir for conveying the ink mixing the excess dampening water therewith and diffusing the excess dampening water therinto, and a pipe connecting between the ink reservoir and the ink outlet means. The means for moving the platform includes a lifter for vertically moving the platform, and casters for horizontally moving the platform.

Abstract: Disclosed is an ink supplying apparatus which can drive and rotate a fountain roller at an arbitrary speed independently of the peripheral speed of a roller adjacent to the fountain roller when an ink fountain is fitted to a rotary press, which does not require large-scale maintenance and inspection, which is free from any danger, and which is equipped with an ink fountain having a fountain roller capable of being fitted to and removed from a suitable position corresponding to a maximum printing width.

Abstract: A color printing apparatus printing for both sides of a web of printing paper comprises a plurality of printing sections which are arranged at a regular interval in a piled configuration. Each one of the printing section includes a pair of blanket cylinders facing each other which can be moved between their contacting positions and their isolating position. Every blanket cylinder is connected to a plate cylinder which is connected to an inking unit, or an inking unit and a dampening unit. Each of the plate cylinders is further provided with a fine adjusting means for shifting the plate cylinder along its axis with respect to the blanket cylinder. The shifting operation of the fine adjusting means can easily minimize the printing shears caused by moisture without stopping the printing apparatus.

Abstract: Herein disclosed is a web paper cutting position adjusting system which comprises: marking means including a control unit for generating a predetermined phase detection signal by detecting a predetermined rotational phase of a platen, and a marking unit for marking a web paper in response to the predetermined phase detection signal; web paper cutting means disposed a predetermined distance downstream of the marking means for cutting the web paper; mark detecting means interposed between the marking means and the web paper cutting means for detecting the mark to transmit a mark detection signal; cutting phase signal transmitting means associated with the operation of the web paper cutting means for transmitting a cutting phase signal; and web paper threading path changing means including an arithmetic unit having an operation signal transmitting unit made receptive of the mark detection signal and the cutting phase signal for transmiting a web paper threading path length changing signal, if the transmission ti

Abstract: The present invention has as an object to provide an inking device which prevents the generation of vibration in rollers and is capable of supplying the amount of ink uniformly all the time to the surface of printing plate in the direction of its width. The inking device of the invention is constructed such that the distance between the bottom of the ink pan and the surface of the ink fountain roller, the distance between the surface of the ink fountain roller and the surface of the ink transfer roller and the surface of the roller next to it in the downstream direction are made smaller as the distance proceeds downstream. The ink is transferred from the upstream side to the downstream side, and during this ink transfer, the ink distribution is regulated uniformly in the direction of roller width by means of a doctor blade, etc.

Abstract: A roller with a doctor blade has both a harder material portion and a softer material portion provided on the peripheral surface in the same radius from the center of the roller, for achieving complete doctoring. The harder material portion forms a minimum belt-like line in a non-perpendicular direction with respect to the axis of the roller, and preventing wear by doctoring against the softer material portion, and limits the wear of the doctor blade, producing uniform wear without a fear of local wear. The softer material portion has maximum area provided between the turns of the belt-like line and facilitates the formation of cells for measuring and the use of a lipophilic material.

Abstract: A groove having parallel walls is formed in the longitudinal direction of a blanket cylinder.A pair of retainers are attached to and along both ends of a blanket. The opposing end surfaces of the pair of retainers have alternating convexities and concavities arranged to permit the opposing surfaces to slide up and down relatively to each other. The total width of the pair of retainers with the convexities and concavities mating with each other coincides with the width of the groove. The pair of retainers are guided by the walls of the groove such that each retainer can be moved up and down along the associated wall independently of each other as a plurality of tensioning bolts are tightened or loosened.

Abstract: A double truck mechanism consists of a first truck adapted to move along first rails extending parallel to a reel shaft and support a new web loaded on it and a second truck adapted to move along second rails extending right beneath and at right angles to the reel shaft and the first rails and support the first truck brought and loaded onto it, the second truck being provided with a main lifter for lifting and lowering the loaded first truck, the mechanism includes a pair of web core collecting mechanisms on the second truck and mechanism for mounting and demounting the web core and a sequential control mechanism for controlling one cycle operation of the individual mechanisms.