Tension roller clutch for machines, in particular for combine harvesters

摘要

The invention relates to a tension roller clutch for machines, in particular for combine harvesters (1). A tension roller (6) guided in such a way that it can be moved transversely to one strand of a power-transmitting belt drive (4) can be moved out of one end position, the disengagement position, with the aid of an actuator (10), coupled to it via a coupling linkage (14 to 17), of a coupling motor (9) into the other end position, the coupling position, in which in imparts the necessary strand tension to the belt drive (4). In order to ensure immediate disengagement of the clutch in the event of risks, the actuator (10) of the coupling motor (9) engages on the coupling linkage with a large play and the coupling linkage (27) includes a toggle-lever mechanism (8) which guarantees a coupling position in which the dead centre position is fixed by means of a stop, and a return spring (23) which is tensioned in the coupling position and ensures that the roller is pivoted fully into the release position in dependence on a release pulse which acts on the toggle lever mechanism (23) and moves the latter back beyond the dead centre position. <IMAGE>