Cam driven piston compressor

1. A cam driven piston compressor comprising:

a. three cams mounted on a cam shaft of a motor at an angle of 120° relative to one another and powered by said motor and adapted to rotate in parallel planes;

b. a cam follower in contact with each of said cams;

c. a piston attached to each cam follower;

d. a cylinder enclosing each piston, wherein at least two of said cylinders are of different diameter; and

e. a compressor head in contact with each of said cylinders; whereby each of said cams has a shape producing substantially 240° of input rotation used to extend a respective said piston and substantially 120° of output rotation used to retract a respective said piston.

2. The cam driven piston compressor set forth in claim 1 comprising a plurality of cam followers, a plurality of pistons, and a plurality of cylinders;

a. wherein said pluralities of cam followers, pistons, and cylinders are of like number.

3. The cam driven piston compressor set forth in claim 2 wherein the number of cylinders which would compress a gas at one time is equal to or greater than the number of cylinders that would not be compressing a gas.

4. The cam driven piston compressor set forth in claim 2 wherein each of said plurality of cam followers includes a rotatable bearing that contacts each of said plurality of cams.

5. The cam driven piston compressor set forth in claim 2 further including at least one spring contacting at least one cam follower for pressing said cam follower against a corresponding one of said plurality of cams.

6. The cam driven piston compressor set forth in claim 5 wherein said at least one spring comprises three springs.

7. The cam driven piston compressor set forth in claim 1 wherein said plurality of cams each has the same size and shape.