The invention discloses a postage machine for dealing with big letters in large batch, including separation device, delivery device, damp belt and head, as well as a synchronous adjustment, which is composed of slide rail, slide board and screw. The slide board is installed in the rail, and one end of it links with the screw, on which, the damp belt and head is fixed. As the head and damp belt were installed on one slide board, rotating screw can drive the board translating on the rail, so that the position of damp belt and heat change and the gap of damp device and head can be adjusted in synchronization. |