Folding head cutting blade attachment device for mowing harvesters. Especially designed to allow uncoupling the mechanism of actuation of the blades when they are folded, the device incorporates a box or housing (4) in which an alternative horizontal displacement mechanism of an axis (1) is established to which the blades of the head are associated, a mechanism that connects to the power take-off of the combine, with the particularity that the blades are arranged on two arms (2-2 ') that are related to each other by means of a hinge system (8 ) to which the shaft (1) is selectively attachable / detachable and tongue-and-groove, blocking and unlocking the hinge system, with the particular feature that the housing (4) is axially movable by means of guides (6) that play along of some stems (12), integral to the head of the combine, head in which a hydraulic cylinder (5) is established which, by means of the corresponding limit switches (7), moves axially to the housing (4), and consequently to the shaft (1), causing the blockage or release of the hinge system (8).Dispositivo de unión de cuchilla de corte de cabezales plegables para cosechadoras de siega.#Especialmente concebido para permitir desvincular el mecanismo de accionamiento de las cuchillas de éstas cuando las mismas se encuentran plegadas, el dispositivo incorpora un cajetín o carcasa (4) en cuyo seno se establece un mecanismo de desplazamiento horizontal alternativo de un eje (1) al que se asocian las cuchillas del cabezal, mecanismo que se conecta a la toma de fuerza de la cosechadora, con la particularidad de que las cuchillas se disponen sobre dos brazos (2-2) que se relacionan entre sí mediante un sistema de abisagramiento (8) al que es acoplable/desacoplable selectivamente y de forma machihembrada el eje (1), bloqueando y desbloqueando el sistema de abisagramiento, con la particularidad de que la carcasa (4) es desplazable axialmente mediante unas guías (6) que juegan a lo largo de unos vástagos (12),
