Objects (14) such as transport holders containing carton blanks are transferred between first and second conveyors (16, 20). The objects are held on the first conveyor prior to transfer and on the second conveyor after transfer by travelling magnets (44). At the instant of transfer, the attraction of the travelling magnet of the first conveyor is weakened by interaction with a fixed magnet (46) which diverts magnetic flux from the object (14), and simultaneously, the attraction of the travelling magnet of the second conveyor is boosted by interaction with a fixed magnet (46) which reinforces the flux path through the object (14). The precision of the timing of the transfer is thereby improved and is made readily adjustable by repositioning of the fixed magnets (46).
