This application relates to a delivery apparatus and an automated assembly line. The delivery apparatus may include: a delivery assembly including a delivery guide rail and a delivery tool, where the delivery tool may be slidably disposed on the delivery guide rail; a docking assembly including a docking drive structure and a docking guide rail, where the docking drive structure may be configured to drive the docking guide rail to move relative to the delivery guide rail so that the docking guide rail is able to dock with the delivery guide rail; and a blocking assembly configured to block the delivery tool on the delivery guide rail before the docking guide rail docks with the delivery guide rail for receiving the delivery tool.

A cam mechanism includes a base, a roller gear, and a camshaft. The roller gear and the camshaft are rotatably supported by the base. The roller gear has a turret and a plurality of cam followers mounted on the circumference of the turret. The camshaft has a shaft portion and a tapered rib having a first tapered rib and a second tapered rib. The first and second tapered ribs are each engaged with the cam followers. The first and second tapered ribs are configured to rotate relative to each other around a rotation axis of the shaft portion during adjustment of preload at which the first and second tapered ribs are pressed against the cam followers. After the adjustment of the preload, the second tapered rib is fixed to the shaft portion, and the first and second tapered ribs are prevented from rotating relatively.