a system for handling objects in rotary machines , and , more particularly , a system for handling preforms in blowing machines . the system picks up a pre - heated preform from a transferring star of the preform and takes it to a mould of a stretch - blowing machine by using movements entailing reduced acceleration values , in particular of the tangential acceleration component , so as to prevent uncontrolled oscillatory movements of the softened preform . in the blowing machine , the preform is blown to obtain a bottle , and the bottle thus obtained is picked up from the stretch - blow moulding position and transferred to an unloading position .