This invention discloses an ink dispensing system (3) for a rotary printing unit of a printing machine using the nip area (8) between the inking cylinder (7) and the gravure/anilox cylinder (6) as the sole source of inking. Our solution solves the problem of reducing the amount of ink present in the nip area (8), which serves as an inking buffer, of such printing machines, thereby accelerating the reaction time of an ink replacement and reducing the amount of waste and the cleaning time. The idea behind the invention is to provide ink to the nip area (8) at selected locations when needed by using a ink dispensing system (3) that moves along the nip area (8).
This document discloses an ink dispensing system (1) for dispensing a precise and continuous amount of ink (5) to a printing press. The ink dispensing system (1) can be combined into a more elaborate ink dispensing system (1) that uses two chambers (2, 22) with ink (5, 25) having a different density for dispensing ink (5, 25) with a precise, adjustable and stable ink density. The ink dispensing system (1) can be used to compensate the drifts in quality observed in presses when the speed, or any environmental parameter varies.
The present invention concerns an inking system for a flexographic or a rotogravure press. The inking system uses a very small amount of ink (10) coupled with an ink source (6) made of two tanks (62) with two different inks. Thanks to feedback given by measuring the output directly on the printed support, the system mixes the ink in the optimal proportions to ensure an optimal printing quality at any time. It can compensate any effect due to environmental changes like the humidity or the temperature. This system, coupled with a seven colours press allows for the replacement of spot colours in most cases therby saving time and costs.
The invention discloses an inking system for a rotary printing machine, like a flexographic or rotogravure press. The inking system uses the nip area between two cylinders (2, 3) of the machine as the sole source for inking the printing cylinder. This results in an inking system with very little ink, thereby gaining in reaction time and ink waste.
The present invention discloses a printing unit (1) with an automated sleeve change process. A sleeve (40) can be prepared for the next printing job while the current job is running, thereby reducing the changeover time. Also, the printing unit can handle printing sleeves of very different sizes without any special additional adjustments to be made. The printing unit (1) translates the printing roller (102, 202) and the inking roller (8) on a horizontal line (30) to engage and dis-engage the printing roller. The invention is convenient for large printing sleeves because the sleeve can be slipped over a shaft that remains in the unit. The setup results in a very rigid system, which guarantees an excellent printing quality.
The present invention concerns a printing unit provided with an engraved printing roller (1) and a relative method for controlling and adjusting printing parameters such as printing density and colorimetric parameters in printing machine, in particular flexographic printing machines.
The present invention concerns an inking for a flexographic or a rotogravure press. The inking system has an ink recirculation circuit (50) coupled with an ink source (62) made of two tanks with two different inks. Thanks to feedback given by measuring (71) the output directly on the printed support, the system mixes the ink in the optimal proportions to ensure an optimal printing quality at any time. It can compensate any effect due to environmental changes like the humidity of the temperature. Also, the inking system has an inductive heater (100) to control the temperature of the anilox or the gravure cylinder (1) to obtain the optimal ink viscosity, which might change according to the different inking mixtures.
The present invention concerns a device and a method for controlling and adjusting printing parameters such as printing density and colorimetric parameters in printing machine, in particular flexographic printing machines. The printing parameters are modified by controlling the ink viscosity with an inductive heater (6) added to the anilox roller (10).
B41J 25/304 - Bodily-movable mechanisms for print heads or carriages movable towards or from paper surface
B41J 2/005 - Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
The invention relates to the field of printing apparatusses, in particular flexographic printing apparatusses, and more specifically relates to an apparatus (1) and method for mounting a printing plate (2) on a printing cylinder (4) or a printing sleeve, comprising a system for pre-alignment (5, 8) of a printing plate (2) and real-time alignment (5, 8) of the said printing plate (2) during mounting.
B41F 27/00 - Devices for attaching printing elements or formes to supports
B41F 27/12 - Devices for attaching printing elements or formes to supports for attaching flexible printing formes
B41F 27/14 - Devices for attaching printing elements or formes to supports for attaching printing formes to intermediate supports, e.g. adapter members
B41F 5/24 - Rotary letterpress machines for flexographic printing
11.
AN APPARATUS AND METHOD FOR CHANGING A BLADE OF A ROTARY DIE CUTTER, PARTICULARLY FOR FLEXOGRAPHIC PRINTING MACHINES
Apparatus (1) for changing a blade of a rotary die cutter, particularly for flexographic printing machines, comprising a magnetic cylinder (3) configured to receive and support a die-cutting blade (5, 5'). The particular feature of the invention consists in the fact that it comprises a station (7) for inserting the blade (5, 5'), comprising retention means (70) configured to retain the blade (5) in the insertion station, and guiding means (71) configured to guide the blade (5, 5') toward the magnetic cylinder (3) and in that it comprises a station (9) for extracting the blade (5, 5'), comprising extraction means (90) configured to remove the blade (5, 5') from the magnetic cylinder (3).
B41G 7/00 - Auxiliary perforating apparatus associated with printing devices
B41F 19/00 - Apparatus or machines for carrying out printing operations combined with other operations
B26D 5/00 - Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
B26D 7/27 - Means for performing other operations combined with cutting
12.
METHOD AND DEVICE FOR REPLACING THE PRINTING ROLLER OF A PRINTING UNIT OF A PRINTING MACHINE
The present invention relates to a device (1) for replacing the printing roller (130) in a printing unit (2), in particular for in-line rotary flexographic machines.
A device (1) for replacing the printing rollers of a printing unit (2), particularly for in-line flexographic rotary machines, which comprises: - a work station (5) for a first, working printing roller (13), - a holding station (3, 7) for a second printing roller (11), - a removal station (7, 3) for a printing roller (11, 13) to be removed, - movement means (9), for the movement of the first printing roller (13) from the work station (5) to the removal station (7, 3) and for the movement of the second printing roller (11) from the holding station (3, 7) to the work station (5).
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