Collection device for grass cutting machines

A grass cutting machine comprising a chassis including a cutting chamber, a cutting member mounted for rotation in the cutting chamber, a power source, a drive line for drivingly connecting the power source and the cutting member, means for creating a stream of pressure air, a receptacle for collecting cut grass, means for removably supporting the receptacle on the machine, the receptacle including a base wall, an upper wall and at least one side wall, a part of at least the base wall including an air permeable region to retain cut grass in the receptacle, the receptacle having at least one inlet disposed externally of the cutting member and in a region of the base wall for entry of cut grass entrained in the stream of air directly into the receptacle, a plenum chamber disposed between at least said air permeable region of the base wall and the means for creating the stream of pressure air, said air permeable region permitting, in use, said stream of air to be drawn by said means for creating the stream of pressure air through cut grass retained in the receptacle and through said air permeable region which serves to filter the stream of air which compacts the cut grass in the receptacle.