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: An apparatus for positional adjustment of a plate cylinder in both lateral and circumferential directions thereof for image registration in a multicolor, offset rotary printing press. A lateral adjustment mechanism includes a spur gear which is motor driven bidirectionally, and which travels laterally back and forth, to cause lateral displacement of the plate cylinder. The gear has a pin erected eccentrically thereon for abutment against a fixed limit stop on the press frame in order to limit the bidirectional rotation of the gear and hence to prevent the plate cylinder from being driven laterally beyond limits. A circumferential adjustment mechanism includes another spur gear which is motor driven bidirectionally, and which also travels laterally back and forth, to cause circumferential displacement of the plate cylinder. This second gear has a double-ended pin extending eccentrically therethrough and having its ends projecting in opposite directions therefrom.

Abstract: An inking device for feeding ink that is fed to an ink rail to a printing plate on a plate cylinder via a group of rollers that are sequentially in contact with each other, comprising a first roller part of the outer periphery of which faces an ink feeding surface of the ink rail, a second roller that is disposed downstream of the first roller in the ink feeding process and in contact with the outer periphery of the first roller on the downstream side in the rotating direction from the position at which the first roller faces the ink feeding surface of the ink rail, a third roller that is in contact with the first roller on the downstream side in the rotating direction from the position at which the second roller comes in contact with the outer periphery of the first roller, and a fourth roller that is in contact with the outer peripheries of the second and third rollers and blocks the front side in the rotating direction of the first and second rollers at the position where the first and second rollers are i

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: An apparatus for positional adjustment of a plate cylinder in both lateral and circumferential directions thereof for image registration in a multicolor, offset rotary printing press. A lateral adjustment mechanism includes a spur gear which is motor driven bidirectionally, and which travels laterally back and forth, to cause lateral displacement of the plate cylinder. The gear has a pin erected eccentrically thereon for abutment against a fixed limit stop on the press frame in order to limit the bidirectional rotation of the gear and hence to prevent the plate cylinder from being driven laterally beyond limits. A circumferential adjustment mechanism includes another spur gear which is motor driven bidirectionally, and which also travels laterally back and forth, to cause circumferential displacement of the plate cylinder. This second gear has a pin extending eccentrically therethrough and having its ends projecting in opposite directions therefrom.

Abstract: An inking device for feeding ink that is fed to an ink rail to a printing plate on a plate cylinder via a group of rollers that are sequentially in contact with each other, comprising a first roller part of the outer periphery of which faces an ink feeding surface of the ink rail, a second roller that is disposed downstream of the first roller in the ink feeding process and in contact with the outer periphery of the first roller on the downstream side in the rotating direction from the position at which the first roller faces the ink feeding surface of the ink rail, a third roller that is in contact with the first roller on the downstream side in the rotating direction from the position at which the second roller comes in contact with the outer periphery of the first roller, and a fourth roller that is in contact with the outer peripheries of the second and third rollers and blocks the front side in the rotating direction of the first and second rollers at the position where the first and second rollers are i

Abstract: In an ink supply device having an ink reserve vessel being composed of a bottom member and surrounding side wall members, means for shifting one member of the bottom and surrounding side wall members between a closed position contacting the one member with the other members to form the ink reserve vessel and an open position separating the one member from the other members at the bottom level of the ink reserve vessel are provided for quickly discharging ink therefrom.