The invention refers to a glass forming machine which includes a blank station for forming a parison (14) from a gob of molten glass (9) and a blow station for forming the parison (14) into a container (26) and an invert mechanism (16) which can move a neck ring (5) from the blank station to the blow station by a rotary motion and which further includes a swab robot and a control device for the swab robot, wherein the control device is set up so that the swab robot can swab and thus swab the neck ring (5) when the neck ring (5) is in an intermediate position between the blank station and the blow station. Defects in the production of bottles can thus be avoided.