| 摘要 |
A postage metering apparatus including a postage meter having a housing, a printing device disposed in the housing, an aperture in the housing exposing the printing device, a shutter bar mounted to the postage meter housing for movement from a closed position in which the shutter bar is disposed to cover the aperture and an open position in which the shutter bar is disposed away from the aperture, the shutter bar preventing access to the printing device through the aperture when the shutter bar is in the closed position and permitting access to the printing device when the shutter bar is in the open position; a base into which the postage meter is removeably inserted, the base including engaging structure for engaging the shutter bar; and driving structure for driving the engaging structure to move the cover between the closed and open positions, the driving structure including a motor, a drive shaft coupled to and driven into rotation by the motor and having a worm gear at one end thereof, a first pinion gear in meshing engagement with the worm gear, a first rack gear in meshing engagement with the first pinion gear and to which the engaging structure is fixedly connected and wherein at times when the motor is energized to drive the drive shaft into rotation the first rack gear is forced to move via the pinion gear and the worm gear carrying the first engaging structure with it and correspondingly the shutter bar.
|
