Patent ID: 8042692

Claim:
A device for conveying flat articles having outer envelopes made of a plastics material or of paper, in which device the flat articles are moved in series while being at a pitch one from the next that is normally constant, and in which device a synchronization device is provided for compensating for a certain amount of variation in said pitch, said device comprising: detector and categorizer means for detecting whether the outer envelope of a current article is made of a plastics material or of paper, and for categorizing the current mailpiece into one of two classes corresponding respectively to the class of mailpieces having envelopes made of plastic, and to the class of mailpieces having envelopes made of paper; identifier and recorder means for identifying a certain amount of variation in the pitch for the current article and for recording a cumulative pitch variation in a memory in correspondence with said class of the current article; and servocontrol means for servocontrolling the synchronization system on the basis of said cumulative pitch variation recorded in the memory in correspondence with said class of the current article.