Method and apparatus for precision pumping, ratioing and dispensing of work fluids

High precision versatile apparatus for positive displacement dispensing of a first work liquid from source means for said first work liquid comprising frame means, pump means having cylinder means and piston means, said cylinder means having inlet means connectable to said source means and outlet means separate from said inlet means, said piston means and said cylinder means being mounted for relative movement to each other to cause positive displacement of said first work liquid receivable from said source means entering through said inlet means and out through said outlet means, one of said cylinder means and said piston means being fixed relative to said frame means and the other being mounted for movement relative to said frame means from a first stop position to a second stop position and a third stop position, motion control means mounted on said frame means for said piston means and said cylinder means to control the relative motion and the relative positions each to the other between said piston means and said cylinder means and thereby the output of work liquid through said outlet means, said motion control means being characterized as being operable to cause said relative movement to:

• (a) start and move from said first stop position to said second stop position and thereby displace a first precise portion of said first work liquid through said outlet means,
• (b) start and move from said second stop position to said third stop position and thereby displace a second precise portion of said first work liquid through said out let means,
• (c) start and move from said first position to said third position without stopping at said second position and thereby displace said first and second precise portions of said first work liquid through said outlet means,
• (d) start and move from said second stop position to said first stop position,
• (e) start and move from said third stop position to said first stop position without stopping at said second stop position;
• and operator selective adjustable means for controlling said motion control means characterized as being operable to cause said motion control means to move between said first and second, first and third positions and second and third positions in any repeatable or variable selected sequence, at any repeatable or variable selected time or condition dependent interval between such movements, and at a selected constant or variable relative velocity movement whereby versatile positive displacement precision dispensing of said first work liquid receivable from said source means is provided.