Clockwork control valve mechanism

In an apparatus for controlling the operation of a fluid mixer of the type having a valve member to open and close a valve passage in a valve housing and a clockwork mechanism for timing the opening and closing of the valve member, the housing having a valve chamber with a valve outlet passage, the improvement comprising an elongated valve member axially movable in the chamber, said elongated valve member having an axially extending follower portion, a cam plate rotatably mounted in said housing adjacent one end of said follower portion and engaged with said follower portion for the controlled movement of said valve member, spring means for biasing said valve member towards said cam plate to engage said follower portion with said cam plate, said cam plate having a control surface acting on said follower portion to move said valve member axially during a portion of rotation of said cam plate, a sleeve member rotatably mounted on said housing operatively connected to the clockwork mechanism, said sleeve member being rotatably operative to wind the clockwork mechanism during a first portion of the rotational movement of said sleeve member, interengaging means for engaging said clockwork mechanism and said cam plate which are disengaged during said first portion of the rotational movement and which are engaged during a further rotational movement of said sleeve member to drive said cam plate during said further rotational movement while winding of said clockwork mechanism continues during said further rotational movement, and said interengaging means being operative to drive said cam member oppositely upon release of said sleeve member.