Abstract: A safety device for rotary printing press is provided in which, if a blanket cylinder and a plate cylinder move a little larger, a gap between surfaces of the cylinders and guard member can be maintained to be less than a predetermined value and the function of safety protection is kept properly.

Abstract: A safety device for rotary printing press is provided in which, if a blanket cylinder and a plate cylinder move a little larger, a gap between surfaces of the cylinders and guard member can be maintained to be less than a predetermined value and the function of safety protection is kept properly.

Abstract: A groove for receiving opposite end edges of an object, like a printing plate that extends around a printing cylinder, is formed in a printing cylinder adjacent the outer circumferential surface thereof to extend from an axially extending anchor-shaft hole to the outer circumferential surface of the cylinder body. One wall surface of the groove intersects, at an acute angle, a tangent plane passing through a line of intersection between the wall surface and the outer circumferential surface of the printing cylinder, thereby forming an edge together with the circumferential surface of the printing cylinder. When an anchor shaft inserted into the anchor-shaft hole is rotated by means of elastic force, pins studded into a cutaway surface of the anchor-shaft enter anchor holes formed in an end edge portion of the object and secure the end edge portion within the groove. Thus, the object is attached to the printing cylinder.

Abstract: A blanket cylinder used in offset lithography includes a cylinder body, a retainer spindle and a resilient member. The cylinder body has an undercut groove with a first undercut longitudinal edge for engaging a first flange of a carrier sheet and a second undercut longitudinal edge for temporarily engaging a rim of the carrier sheet. The retainer spindle is received in the undercut groove for bi-directional rotation. The retainer spindle includes a pull-in hook that engages the rim of the carrier sheet to pull a second end portion thereof into the undercut groove with rotation of the retainer spindle in a first direction and a push-out ledge abuts against the rim of the carrier sheet in order to push a second end portion thereof out of the undercut groove with rotation of the retainer spindle in a second direction. The resilient member energizes the retainer spindle in the first direction.

Abstract: A groove for receiving opposite end edges of an object such as a printing plate is formed in a printing cylinder in the vicinity of the outer circumferential surface thereof such that the groove extends from an axially extending anchor-shaft hole toward the outer circumferential surface of the cylinder body, thereby opening at the outer circumferential surface. One wall surface of the groove intersects, at an acute angle, with a tangent plane passing through a line of intersection between the wall surface and the outer circumferential surface of the printing cylinder, thereby forming an edge together with the outer circumferential surface of the printing cylinder. The first end edge portion of the object is bent at an acute angle, and the second end edge portion of the object is bent at an obtuse angel which is substantially the supplementary angle of the acute angle.

Abstract: A blanket cylinder for use in offset lithography in combination with a blanket assembly having a rubber blanket bonded to a major portion of a metal-made carrier sheet. The carrier sheet has a first end portion bent at an angle to the major portion to provide a first flange, and a second end portion bent twofold to provide a second flange at an angle to the major portion, and a rim at an angle to the second flange. The blanket cylinder has formed therein an undercut groove in which the flanges of the blanket carrier sheet are to be received, with the first flange in positive engagement with one longitudinal edge of the groove.

Abstract: A groove for receiving opposite end edges of an object such as a printing plate is formed in a printing cylinder in the vicinity of the outer circumferential surface thereof such that the groove extends from an axially extending anchor-shaft hole toward the outer circumferential surface of the cylinder body, thereby opening at the outer circumferential surface. One wall surface of the groove intersects, at an acute angle, with a tangent plane passing through a line of intersection between the wall surface and the outer circumferential surface of the printing cylinder, thereby forming an edge together with the outer circumferential surface of the printing cylinder. The first end edge portion of the object is bent at an acute angle, and the second end edge portion of the object is bent at an obtuse angel which is substantially the supplementary angle of the acute angle.

Abstract: Disclosed is an ink furnishing apparatus in a lithographic printing press with a keyless system which performs printing by furnishing a relatively high viscous ink and dampening water to printing plates on a plate cylinder. A first shearing force is exerted on the ink upon drawing out the ink deposited on a peripheral surface of a fountain roller through a first gap between an ink fountain and the peripheral surface of the fountain roller by rotation of the fountain roller, and a second shearing force is exerted on the ink due to a difference of peripheral speeds of the fountain roller and a first intermediate roller upon transition of the ink from the peripheral surface of the fountain roller to the peripheral surface of the first intermediate roller across a second gap between the peripheral surface of the fountain roller and the peripheral surface of the first intermediate roller, thus, water is separated from the ink.

Abstract: An ink furnishing apparatus is capable of furnishing relative high viscosity ink in keyless ink furnishing. The apparatus operates in such a manner that an ink drawn from an ink fountain by rotation of a fountain roller and having a thickness corresponding to a first gap is supplied to the peripheral surface with compression by passing through a second gap, is provided fluidity by compression and disrupter through contact between the peripheral surfaces of an uneven surface roller and an intermediate roller and contact between the peripheral surfaces of the intermediate roller and a metering roller for supplying to the peripheral surface of the metering roller, the excess amount of ink on the peripheral surface of the metering roller is scraped off by a doctor means and returned to the ink fountain for supplying substantially uniform amount of ink at any axial position of the metering roller to a printing plate on a plate cylinder via the peripheral surface of the form roller.

Abstract: An ink furnishing apparatus for a printing press for performing printing by furnishing an ink to a printing plate on a plate cylinder is selectively operable in an entire surface ink furnishing mode, in which a first gap is held fully opened, the doctor means is placed in contact with the metering roller, ink drawn through the fully opened first gap in a thickness corresponding to the first gap by rotation of the fountain roller, is furnished in an excess amount of ink onto the peripheral surface of the metering roller, the extra amount of ink on the peripheral surface is scraped off by means of the doctor means contacting with the peripheral surface of the metering roller to return to the ink fountain, and the ink is furnished onto a printing plate in a plate cylinder via the peripheral surface of the form roller in substantially uniform amount over the entire position along the axis of the metering roller, and in a local ink furnishing mode, in which the first gap is adjusted to be narrower with respect to