Abstract: A crop harvesting machine includes a crop harvesting header mounted on a transport vehicle for carrying the header across the ground with at least one upper connecting link extending from the vehicle frame to an upper frame member and two support arms each extending from a front end at the header to a rear end pivotally mounted on the vehicle frame and arranged at a height below the upper link. Each support arm has a respective float spring connected thereto at a pivot thereon forwardly of the rear end and extending therefrom to the vehicle frame for applying a lifting force on the support arm. Each support arm has a pivot connection at the rear end defined by a pivotal link connected at a forward end to the frame by a resilient bushing and at a rear end by a similar bushing to the rear end of the support arm.

Abstract: A crop conditioning apparatus includes two parallel fluted intermeshing rollers mounted for rotation about respective axes for passage of crop material therebetween and for movement of the axes in a direction to increase and decrease the spacing the rollers. The rollers and flutes are substantially rigid, such that rotation of the rollers while intermeshing without crop material therebetween and while out of synchronism causes unacceptable noisy contact between the flutes. Each roller being driven by a respective one of two motors arranged to generate substantially equal torque so as to tend to rotate the rollers at common angular velocity. A timing arrangement for maintaining the rollers in synchronism includes a gear wheel having a plurality of gear lobes thereon projecting radially outwardly therefrom on one roller and a disk parallel to the gear wheel with a plurality of rollers projecting outwardly from one face of the disk into a position between the gear lobes of the first member.