MECHANISMS FOR DISENGAGING AND ENGAGING THE DRIVE CONNECTION BETWEEN A ROTATING CAM DISC AND A CAM FOLLOWER NORMALLY IN ENGAGEMENT WITH THE CAM DISC

摘要

Improvements in mechanisms for decoupling and coupling the transmission connection between a rotating cam disc and a cam follower normally coupled with the cam disc, of the mechanism type comprising: a first cam element rigidly connected to the cam follower for movement in unison with it; a second cam element cooperating with the first cam element and movable between an inactive position and an active position, in which last position the cam elements are in mutual contact to keep the cam follower separate from the cam disc; and a fluid cylinder to move the second cam element into its active position and in the opposite direction, the mechanism being constructed to allow the last mentioned movement only when the cam follower engages with the cam disc at its vertex or in a point adjacent to it; characterized in that the second cam element and a fluid actuated control slider incorporated in the circuit; fluid supply and control cylinder, rigidly connected to each other to form a unit rotatably supported in a box and axially movable between a first retracted position where the second cam element is located outside the path of movement of the first cam element, and a second position or advanced position in which the second cam element is located in the path of movement; the control cursor being formed so that a rotation of the unit can be made, to the active position of the second cam element only when the unit is in the second position, and so that an axial displacement of the unit to the first position is possible only after a previous rotation of the unit to the inoperative or inactive position of the second cam element. (Machine-translation by Google Translate, not legally binding)