| 摘要 |
A mail-handling tower (10) is associated with a mail container conveyor (12, 312). AC line power is supplied to the tower, which in turn supplies power at low voltage to power the associated conveyor directly by way of two ports (20a, 20b) and indirectly by way of a third, higher-voltage port (20c). A power cut-off switch (8) allows emergency shut-down of the mechanical portions of the tower, and also cuts power from the conveyor (12) powered from the tower ports. The power available at the conveyor energizing ports (20a, 20b, and 20c) allows a maximum run of conveyor. When the conveyor must be run for a greater distance than that which can be powered from the tower, an additional conveyor section (312) is coupled to the remote end (12re) of the first conveyor (12), and a line power source (314) is transformed (320) to a lower voltage, and applied to a power port (2401, 2601) of the additional conveyor (312). In order to avoid having the second conveyor run in the event that the tower it feeds is deenergized, a relay (316) cuts the additional line power source.
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