Positive cam type compressor

A positive cam type compressor comprising a cylinder having opposite ends, valve plates at each of the ends of the cylinder, front and rear plate casings on said valve plates defining respective compartments, a positive cam mounted in said cylinder to form chambers on opposite sides of the cam, means for rotating said cam, said valve plates having suction and exhaust valve openings for respective feed and discharge of fluid to and from said chambers, at least one isolator plate slidably supported by said cylinder, plate casings, and valve plates, said cam being slidably engaged with said isolator plate to produce successive suction and compression stages in said chambers and reciprocal movement of said plate into and out of said compartments as said cam undergoes rotation, a tank for lubricating fluid, said plate casings having small holes in opposite end walls thereof communicating with said tank, said isolator plate being provided with a network of lubricating channels which open at the surface of the isolator plate for facing regions to be lubricated, said isolator plate having opposite ends with small ports thereat leading to said network of channels, said ports facing said end walls of the plate casings for conveying lubricating fluid to and from said network as the isolator plate undergoes reciprocal movement, wherein said isolator plate constitutes a piston which penetrates into said compartments respectively and produces pressure therein to force the lubricating fluid into said network via said ports and withdraws from said compartments respectively and produces suction therein producing return of lubricating fluid thereto.