Synchronization system (10, 20) for infeed into a synchronous packer chain of a packaging machine of groups of products for the manufacturing of rolls or boxes of cookies, each of the group consisting of a predetermined amount of individual products (5a, 5b,...) such as biscuits or cookies, the system comprising: - a transport device, comprising a conveyor chain arranged to transport said groups of products in a transverse direction relative to a conveying direction (Tt) of said conveyor chain towards a synchronous packer chain of said packaging machine; - a synchronization device, arranged to be positioned between said transport device and said packaging machine, and comprising a plurality of conveyer members for taking over said groups of products between pairs (21a, 21b, 21c,..., 21x) of said plurality of conveyer members in a direction perpendicular to said conveyer chain in a longitudinal direction in respect to said conveying direction (Ts) of said conveying members, wherein said synchronization device is further arranged to synchronize said groups of products at predetermined mutually equal pitch, and transfer speed with a constant pitch and conveying speed of said synchronous packer chain for accordingly take over by said packer chain of said groups of products by, during the time of taking over said group of products from said conveyer chain and the moment of taking over by said packer chain, increasing and/or decreasing said pitch between said pairs of conveyer members (21, 21b, 21c,..., 21x), characterized in that said synchronization device further comprises a discharge hatch positioned at said take over of said groups of products by said synchronisation device, wherein said discharge hatch is arranged to selectively discharge a group of products from said synchronization system, and wherein the synchronization device is controlled to remove a gap in the supply due to a discharged group by temporarily increasing the supply to the packer chain to synchronize with the packer chain. - a transport device, comprising a conveyor chain arranged to transport said groups of products in a transverse direction relative to a conveying direction (Tt) of said conveyor chain towards a synchronous packer chain of said packaging machine; - a synchronization device, arranged to be positioned between said transport device and said packaging machine, and comprising a plurality of conveyer members for taking over said groups of products between pairs (21a, 21b, 21c,..., 21x) of said plurality of conveyer members in a direction perpendicular to said conveyer chain in a longitudinal direction in respect to said conveying direction (Ts) of said conveying members, wherein said synchronization device is further arranged to synchronize said groups of products at predetermined mutually equal pitch, and transfer speed with a constant pitch and conveying speed of said synchronous packer chain for accordingly take over by said packer chain of said groups of products by, during the time of taking over said group of products from said conveyer chain and the moment of taking over by said packer chain, increasing and/or decreasing said pitch between said pairs of conveyer members (21, 21b, 21c,..., 21x),