Abstract:
There is described a color control pattern (CP) for the optical measurement of colors printed on a sheet or web substrate (S) by means of a multicolor printing press, especially by means of a multicolor security printing press, which substrate (S) exhibits an effective printed region (EF) having a multicolor printed image comprising a plurality of juxtaposed colored areas (A-H) printed with a corresponding plurality of printing inks of different colors, wherein the color control pattern (CP) is located in a margin portion (Im) of the substrate (S) next to the effective printed region (EF). The color control pattern (CP) comprises one or more color control strips (a-d) extending transversely to a direction of transport (T) of the substrate (S), each color control strip (a-d) comprising a plurality of distinct color control fields (CF, CFA to CFH) consisting of printed fields of each relevant printing ink that is printed in the effective printed region (EF). The color control fields (CE, CFA to CFH) are coordinated to actual application of the relevant printing inks in the effective printed region (EF) and are positioned transversely to the direction of transport (T) of the substrate (S) at locations corresponding to actual positions where the relevant printing inks are applied in the effective printed region (EF).
Abstract:
There is described an intaglio printing press comprising a plate cylinder (8) carrying one or more intaglio printing plates (8c) and an impression cylinder (7) cooperating with the plate cylinder (8), a printing nip being formed between the plate cylinder (8) and the impression cylinder (7). The plate cylinder (8) and the impression cylinder (7) each comprise one or more cylinder pits (8a, 7a) and a corresponding number of cylinder segments (8b, 7b), the plate cylinder (8) and the impression cylinder (7) being in rolling contact with one another during printing operations along their respective cylinder segments (8a, 7b) when no cylinder pits (8a, 7a) are present at the printing nip. The intaglio printing press further comprises a monitoring system (150) designed to monitor a rolling condition of the impression cylinder (7) with respect to the plate cylinder (8) and to provide an indication as to whether or not the rolling condition corresponds to a desired rolling condition, the desired rolling condition being a rolling condition corresponding to true rolling of the impression cylinder (7) with respect to the plate cylinder (8) where no slippage occurs between a circumferential surface of the impression cylinder (7) and a circumferential surface of the plate cylinder (8). Also described is a method of monitoring operation of an intaglio printing press.
Abstract:
An intaglio printing press includes: a first intaglio printing unit; a second intaglio printing unit; a dryer for drying a printed surface of a sheet subjected to printing by the first intaglio printing unit; a convertible unit which holds and conveys the sheet received from the first intaglio printing unit and passes the sheet to the second intaglio printing unit in such a way that a surface of the sheet to be subjected to intaglio printing by the second intaglio printing unit is switchable between one surface and another surface of the sheet; and a second skewing adjustment cylinder and a second circumferential adjustment cylinder which are disposed between the convertible unit and the second intaglio printing unit and which adjust a position of a pattern to be intaglio-printed on the sheet by the second intaglio printing unit.
Abstract:
An intaglio printing press includes, a rotary screen comprising a hollow cylinder, which has a small hole group for special ink supply formed in a circumferential surface of the hollow cylinder and which is supported rotatably, and a squeegee contacting an inner peripheral surface of the hollow cylinder, a rubber roller supported rotatably to oppose an outer peripheral surface of the hollow cylinder at a position where the squeegee contacts the inner peripheral surface of the hollow cylinder, and a sheet supplied with special ink, which has been stored within the hollow cylinder, by the squeegee via the small hole group of the hollow cylinder. The intaglio printing press further includes special ink guide means, such as guide grooves, for guiding a surplus of the special ink, which is not supplied to the sheet by the squeegee, to the small hole group of the hollow cylinder.
Abstract:
There is described a method and an inking apparatus (50) for forming an ink pattern (80) on the surface of a form cylinder (15b) of a printing press, which ink pattern (80) exhibits, at least in part, a two-dimensional ink gradient extending in an axial direction and a circumferential direction on the surface of the form cylinder (15b). At least first and second chablon cylinders (20, 25) are placed one after the other along an inking path of the ink train (20, 25, 30, 31, 32, 33, 34, 35a, 35b, 36, 37) inking the form cylinder (15b) for distributing ink in the axial and circumferential directions and means (200, 201, 210, 211, 212, 250, 251, 260, 261, 262) are provided for subjecting the first and second chablon cylinders (20, 25) to cyclical oscillation movements in the axial direction and the circumferential direction.
Abstract:
An intaglio printing press includes, a rotary screen comprising a hollow cylinder, which has a small hole group for special ink supply formed in a circumferential surface of the hollow cylinder and which is supported rotatably, and a squeegee contacting an inner peripheral surface of the hollow cylinder, a rubber roller supported rotatably to oppose an outer peripheral surface of the hollow cylinder at a position where the squeegee contacts the inner peripheral surface of the hollow cylinder, and a sheet supplied with special ink, which has been stored within the hollow cylinder, by the squeegee via the small hole group of the hollow cylinder. The intaglio printing press further includes special ink guide means, such as guide grooves, for guiding a surplus of the special ink, which is not supplied to the sheet by the squeegee, to the small hole group of the hollow cylinder.
Abstract:
The machine comprises at least a transfer cylinder, an impression cylinder, a plate cylinder, a collector cylinder, and a delivery cylinder, each said impression cylinder, plate cylinder and collector cylinder comprising pits with, respectively, gripping means, clamping means and holding means for holding, respectively, at least one sheet, at least one plate and at least one blanket. The number of pits per cylinder and the relative position of said cylinders are such that the pits of the impression cylinder, plate cylinder and collector cylinder pass each other at the same moment during operation of the printing machine.
Abstract:
A printing press includes, a printing unit; a motor for driving the printing unit; a first drive system for drivingly connecting a blanketed impression cylinder, etc. of the printing unit to the motor; a first frame cover for covering the first drive system; an inker movable to be capable of being thrown on and thrown off the printing unit; a second drive system for driving ink rollers of the inker; and a second frame cover for covering the second drive system, the printing press further includes a motor for driving the ink rollers of the inker via the second drive system, and wherein opposed surfaces of the first frame cover and the second frame cover are entirely closed.