Abstract: A plate cylinder enables a printing plate to be attached thereto and is improved in strength. A plate cylinder is attached to a rotationally driven plate driving shaft, and is configured to mount a cylindrical printing plate attached thereon from a tip end side thereof. The plate cylinder is provided with a plate cylinder main body having a plate mounting surface to which the printing plate is attached. A flat portion is formed on a flat surface positioned further toward a radially inner side than the plate mounting surface. A plurality of hole portions is formed side by side in an axially separated state in the flat portion. A plurality of plate fixing members tightly fixes the printing plate to the plate mounting surface. The plate fixing members are fitted into the hole portions, and are provided to be movable in radially inward and outward directions of the plate cylinder.

Abstract: A stopper for assuredly preventing shifting of a cylindrical printing plate mounted on a plate cylinder is provided. A plate cylinder 1 has a plate-mounting surface 12 on which a cylindrical printing plate 3 is fitted from the front end side and mounted. A front stopper 4 is provided on the end portion of the front end side. The front stopper 4 is configured so as to be able to switch between a protruding orientation in which at least a portion of the stopper is positioned so as to protrude to the outside of the plate-mounting surface 12 in the radial direction and a retracted orientation in which the entire stopper is positioned to the inside of the plate-mounting surface 12 in the radial direction.

Abstract: A cylindrical printing plate formed with high precision and used for printing on a metal can body, particularly an aluminum or aluminum alloy can body. The forming method of a printing plate forms the printing plate to be mounted on an outer periphery of a cylindrical plate cylinder, and includes a notch forming step of forming a positioning notch in a rectangular elastic material sheet in which a resin layer to be served as a plate section is formed on one surface. A cylindrical material forming step rolls the elastic material sheet in which the positioning notch is formed and overlaps both end portions of the elastic material sheet and joining them in a cylindrical shape. A plate section engraving step engraves a printing pattern on the plate section of the elastic material sheet formed into a cylinder shape.

Abstract: A plate cylinder enables a printing plate to be attached thereto and is improved in strength. A plate cylinder is attached to a rotationally driven plate driving shaft, and is configured to mount a cylindrical printing plate attached thereon from a tip end side thereof. The plate cylinder is provided with a plate cylinder main body having a plate mounting surface to which the printing plate is attached. A flat portion is formed on a flat surface positioned further toward a radially inner side than the plate mounting surface. A plurality of hole portions is formed side by side in an axially separated state in the flat portion. A plurality of plate fixing members tightly fixes the printing plate to the plate mounting surface. The plate fixing members are fitted into the hole portions, and are provided to be movable in radially inward and outward directions of the plate cylinder.

Abstract: A cylindrical printing plate formed with high precision and used for printing on a metal can body, particularly an aluminum or aluminum alloy can body. The forming method of a printing plate forms the printing plate to be mounted on an outer periphery of a cylindrical plate cylinder, and includes a notch forming step of forming a positioning notch in a rectangular elastic material sheet in which a resin layer to be served as a plate section is formed on one surface. A cylindrical material forming step rolls the elastic material sheet in which the positioning notch is formed and overlaps both end portions of the elastic material sheet and joining them in a cylindrical shape. A plate section engraving step engraves a printing pattern on the plate section of the elastic material sheet formed into a cylinder shape.

Abstract: A stopper for assuredly preventing shifting of a cylindrical printing plate mounted on a plate cylinder is provided. A plate cylinder 1 has a plate-mounting surface 12 on which a cylindrical printing plate 3 is fitted from the front end side and mounted. A front stopper 4 is provided on the end portion of the front end side. The front stopper 4 is configured so as to be able to switch between a protruding orientation in which at least a portion of the stopper is positioned so as to protrude to the outside of the plate-mounting surface 12 in the radial direction and a retracted orientation in which the entire stopper is positioned to the inside of the plate-mounting surface 12 in the radial direction.

Abstract: A plate attachment device and a method for attaching and removing printing plates, wherein the positioning accuracy in the circumferential direction relative to a plate cylinder is increased and attachment and removal of the printing plate is easy, are provided. The plate attachment device 1 is equipped with a plate cylinder 11 secured to the outer periphery of a plate drive shaft 31 and having a cylindrical plate attaching surface 12 to which a printing plate 2 is to be attached from the tip end side of the plate drive shaft 31. The plate attaching surface 12 is provided with a plurality of plate securing members 121 which are formed to be movable to both the outer side and inner side in the radial direction of the plate cylinder 11, abut the printing plate 2 attached to the plate attaching surface 12 and expand in the radial direction so as to adhere and secure the printing plate 2 to the plate attaching surface 12.

Abstract: A plate attachment device and a method for attaching and removing printing plates, wherein the positioning accuracy in the circumferential direction relative to a plate cylinder is increased and attachment and removal of the printing plate is easy, are provided. The plate attachment device 1 is equipped with a plate cylinder 11 secured to the outer periphery of a plate drive shaft 31 and having a cylindrical plate attaching surface 12 to which a printing plate 2 is to be attached from the tip end side of the plate drive shaft 31. The plate attaching surface 12 is provided with a plurality of plate securing members 121 which are formed to be movable to both the outer side and inner side in the radial direction of the plate cylinder 11, abut the printing plate 2 attached to the plate attaching surface 12 and expand in the radial direction so as to adhere and secure the printing plate 2 to the plate attaching surface 12.

Abstract: A tubular member is manufactured by by continuously supplying a plurality of elongate flexible webs while positionally displacing the webs in overlapping relation with side edges thereof arranged in a staircase configuration, progressively bending the webs along a mandrel, bonding the webs with adhesive layers interposed therebetween to form a tubular member, and joining the displaced side edges to complete the tubular member. The webs are supplied in mutually spaced-apart relation under longitudinal tension. A plurality of resilient support plate members are disposed respectively for the webs and arranged to lie along the lower surfaces of the webs transversely thereof. Opposite ends of the support plate members are supported for movement vertically and toward and away from each other. The opposite ends of the support plate members are movable toward each other to curve the support members along about an outer peripheral surface of a mandrel.