Patent ID: 7581459

Claim:
A device for transporting parts comprising: a transporting member on which the parts are transported, said transporting member being movably mounted relative to a frame of the device for reciprocating movement along a plane, in which the parts are transported; a driving device for driving the transporting member with the reciprocating movement, the driving device including: at least one drive cam, at least one roller mounted to the transporting member and cooperating with the drive cam, the axis of rotation of the cam and an axis of rotation of the roller being parallel, so that the movement in the plane is a reciprocating translational movement generated by the rotation of the drive cam, a motorized device which drives the cam to rotate around an axis of revolution, said rotation of the cam having a contact surface configured to cause alternative longitudinal displacement of a rail support in cooperation with the roller, the transporting member being connected with the rail such that movement of the rail in the plane includes alternating movement along the plane caused by rotation of the drive cam, and wherein the cam contact surface presents an involute surface curve which includes an acceleration zone, then an advancement zone in which a radius of the cam increases in constant, linear fashion, a declaration zone, and a zone called the “draw-back zone” in which the radius diminishes; and wherein the transporting member moves forward when the roller contacts the acceleration, advancement, and deceleration zones, which zones span an angular segment of the cam ranging between 200° and 300° and the draw-back zone spans an angular segment ranging between 60° and 160°.