| 摘要 |
An electronic programmer (5) controls a first optical means (11) that sees whether a letter has been correctly mailed and, in the positive case, activates an electric motor (12) of a means (7) that conveys an accepted letter into a device (13) that stamps the letter with the date and time, and a second optical means (14) sees whether the stamp impressed is correct and, in the positive case, re-starts said motor (12) so that the letter (L) is dropped to the bottom of the box (1), while in the negative case it re-starts said motor (12), so that the letter be rejected to the slot (2) of the mail box (1), a third optical means (15) checks that the pile of letters (16) on the bottom of the box (1) does not rise above a pre-established level, in which case further letters mailed are rejected by means of a signal (17) to the user and the stop of the electric motor (12)(Fig. 1). <MATH> |
