Abstract: A carton transfer apparatus including an inverting arm having a carrier for transferring individual blanks of flexible paperboard material. The inverting arm pivots so that its effective length remains constant throughout its feeding movement. The inverting arm specifically pivots about a follower on one of its ends; the follower being movable along a track to vary the location of the pivotal axis during the feed movement. The track is secured to a pivotable support member. A feed arm drives the inverting arm and the support member is rotated in timed relationship by an interconnecting link. As the follower on the inverting arm moves along the track, the effective length of the arm is maintained substantially the same so as not to impose acceleration movement on the carrier.