| 摘要 |
A letter scale is adapted to be connected to a postal charge calculator unit and a printhead of a franking machine. It includes a horizontal plate adapted to receive a letter to be weighed and to move vertically due to the weight of the letter. A coding arm is mechanically coupled to the plate so as to move with it. This arm carries coding elements and fixed sensors face towards the arm to sense these coding elements as they move relative to the sensors due to movement of the arm. A processor unit connected to the sensors produces a measurement signal indicating one of a series of predetermined weight range within which the weight of the letter in question lies. A partly closed, flat, vertical casing houses at least the coding arm and the sensors. There is a vertical slot in an upper surface of the casing into which a letter is inserted to weigh it. The horizontal plate forms the bottom of this vertical slot. The letter scale constitutes a module connected and partly integrated into the franking machine. The processor unit is in the franking machine.
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