Patent ID: 7048270

Claim:
A method for changing a format in a packaging machine, the packaging machine having means for folding a leaflet in a folding apparatus, means for supplying the leaflet in a supply device at a constant speed V 1 , means for receiving the leaflet at a transfer position in a holder disposed in a leaflet transport device, means for transporting the leaflet in said leaflet transport device, at a constant speed V 2 , to a folding box transport device, and means for controlling motion of said supply device and said transport device independently of each other, the method comprising the steps of: a) interrupting operation of the packaging machine; b) detecting a first position of the leaflet in said leaflet supply device, using a first leaflet sensor; c) transmitting said first position to a control device; d) detecting a second position of said holder of said leaflet transport device using a holder sensor; e) transmitting said second position to said control device; f) determining, using said control device, an actual relative position between the leaflet and said holder and comparing said actual relative position to a desired relative position; g) adjusting, using said control device, a deviation between said actual relative position and said desired relative position to be below a predetermined limit value; h) setting a ratio V 1 /V 2 to a constant value following step g); and i) resuming operation of the packaging machine following step h), keeping V 1 /V 2 constant.