| 摘要 |
A drive device for driving items of mail along a conveyor path of a postage meter base, the device being disposed upstream from a print mechanism and including first and second motorized feed rollers cooperating with associated moving backing-rollers mounted on hinged means which can pivot about a common hinge axis against return springs fixed to support means, at least one of the backing-rollers comprising a middle backing-wheel mounted on a lever hinged about the common axis and disposed between twin outer backing-wheels each mounted on a respective lever also hinged about a common axis, such that mail items inserted on the conveyor path come into contact with one only of the outer backing-wheels and the middle backing-wheel, or else with all three backing-wheels, depending respectively on whether or not the items are thinner or thicker than a predetermined thickness.
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