Abrégé

The invention relates to a flexographic printer including printing units with improved stability, containing a print drum (1) having several printing units (3) disposed therearound, each of said units consisting of a plate-holding roller (5) rotatably supported on moving supports (7) driven along the length of linear guide elements (9) by linear electric motors (11, 12). Control means are provided to control one or more control parameters for the pre-determined alteration of the conditions relating to the response offered by the linear motors (11, 12) to variations in the position of the plate-holding roller (5) during operation, with the plate-holding roller (5) being returned to the printing position, thereby preventing the system from vibrating at frequencies that can be in resonance.

Classes IPC  ?

• B41F 13/38 - Dispositifs de soulèvement ou de réglage des cylindres à commande électrique ou magnétique
• B41F 5/24 - Rotatives typographiques pour impression flexographique

Abrégé

Comprises: a) moving a first printing roller (5), linearly, via guide systems (17), towards the support drum (1) by means of a linear motor (M1); b) detecting that a point of contact between said first printing roller (5), or a printing block secured around it, and the sheet material (2) supported on the support drum (1) has been reached; c) rotating the support drum (1) and allowing the rotation of the first printing roller (5), moved by the support drum (1) by friction, across the sheet material (2), or rotating both the support drum (1) and the first printing roller (5) in a synchronized manner; and d) detecting the linear towards/away positions on said guide systems (17) of the first printing roller (5).

Classes IPC  ?

• B41F 33/00 - Dispositifs indicateurs, dispositifs de comptage, d'avertissement, de commande ou de sécurité
• B41F 33/16 - Systèmes de programmation pour la commande automatique de la succession d'opérations
• B41F 5/24 - Rotatives typographiques pour impression flexographique
• B41F 31/30 - Systèmes permettant l'excentrage, le soulèvement, le réglage, ou l'enlèvement des rouleaux d'encrageSupports, coussinets ou fourchettes à cet effet

Abrégé

It comprises a removable body (15) that can be secured to a base body (21) by securing means (20). The removable body (15) defines a chamber-forming surface (2) facing an inking roller (5) and it supports two bands (3, 4) and lateral sealing means (11, 12) arranged so as to flank each surface forming the chamber (2) in order to make dynamic hermetic contact with said inking roller (5) in a working position, forming a chamber. On the chamber-forming surface (2) of the removable body (15) there are open inlet and outlet ports (7) that can be connected to ink-circulation means for feeding ink into and discharging it from said chamber (6). The removable body (15) is preferably made from plastic and is configured and arranged so that it can be disposed of together with the bands (3, 4) when the bands (3, 4) need to be replaced after use.

Classes IPC  ?

• B41F 31/02 - Conduits, réservoirs, dispositifs d'alimentation ou de réglage du débit