Abstract: Engine speed is controlled during gear change by way of both fuel supply apparatus and exhaust brake so that engine speed is equal to the rotational speed of an input shaft of a transmission coupled via a clutch to the engine. When the engine speed is higher than the rotational speed of the transmission input shaft, exhaust braking is performed to quickly reduce the engine speed thereby establishing synchronization. Then the fuel supply apparatus is controlled to reduce the amount of fuel for maintaining the decreased engine speed. On the other hand, when the engine speed is lower than the rotational speed of said transmission input shaft, only the fuel supply apparatus is controlled to increase the fuel amount. Engine braking is performed only when the clutch is in disconnected state, and therefore, vehicle speed is not decelerated due to the engine braking.

Abstract: An apparatus for loading or unloading a workpiece to be pressed by a press machine. The equipment has cam grooves for a work motion and a return motion, on which a pin is mounted to contact with the biasing force of a cylinder device. The pin is further engaged with an intermediate portion of a maim arm which constitutes a parallel link mechanism in association with a slider link, a sub arm and a carriage link mounting a workpiece holder thereon. The slider link, on which the upper end of the main arm is secured, upwardly and downwardly moves with the guidance of a guide member. As separate cam grooves are provided for the work motion and the return motion, the workpiece holder can move in an appropriate route. This enables the continuous operation of the press machine.