Abstract: In a process for sorting mail pieces according to the invention using a priori or first sort pass derived information, a sorting machine is used having a first array of pockets and a second array of pockets physically separate from the first array of pockets. The first and second arrays are swept of mail pieces by separate sweepers. The number of mail pieces sorted to each array are equalized in order to equalize the volume of mail pieces swept by each sweeper. In particular, where each pocket corresponds to a destination code and a total number of mail pieces per destination code is known in advance for each sort scheme to be carried out on the sorting machine, the equalizing step involves assigning destination codes to specific pockets to different sweeper zones in a manner that equalizes the volume of mail pieces swept by each sweeper. Mail is then swept from the pockets to trays stored on a vertically and horizontally extending rack having rows and columns of compartments containing trays.

Abstract: A mail sorting process used with a sorting machine where the next successive sort is performed during the sweeping operation of the previous sort. In a first sort, a batch of mailpieces are sorted and directed to a selected first array or group of destination pockets or bins. After the first sort is completed, the mailpieces are swept from the pockets in a sweeping operation. A second sort for sorting a second batch of mailpieces to a selected second array or group of destination pockets is begun during the sweeping operation of the first sort. As such, the sorting process sorts a batch of mailpieces to a group of destination pockets while another group of destination pockets used during a previous sort are being swept.