Nozzle Rotating Apparatus of Module Head in Surface Mounting Device

A self-lubricating cylinder assembly (10) for use in a press operable in an upright orientation and in an inverted orientation. The cylinder assembly contains a working fluid under pressure and lubricating oil. The wall assembly walls are preferably formed of a cylinder liner (20) in connection with an insert (36). The cylinder liner (20) has a piston (16) mounted for reciprocal motion therebetween. A variable volume wall assembly space is defined as a space between the piston (16), the wall assembly walls (20) and the housing end wall (50). An expansion reservoir (38) is defined as a space between the side walls of the cylinder body (12), the wall assembly walls (20) and the cylinder body end wall (50). Lubricating oil recirculation is accomplished by means of a jet mixture of compressible working fluid and lubricating oil sprayed onto the cylinder wall by means of a controlled pressure differential of the compressible working fluid while the piston is moving during the expansion stroke of the work cycle.