Envelope dimensioning system for dimensioning envelope in motion comprising a control unit (40), a mobile support (22) including at least one presence sensor (33B, 33C, 33D, 33E, 33F, 33G, 33H, 33I) wherein for acquiring the envelope width the mobile support moves back and forth perpendicularly to a registration wall (16) along which the envelope is conveyed and the control unit determines the width of the envelope from a determination of the at least one presence sensor which has changed of state and the acquired position of the mobile support, and wherein the number of presence sensors arranged on the mobile support is at least equal to the maximum width of envelopes to size less the minimum width of envelopes to size divided by the distance between two presence sensors on the mobile support, the distance being equal to the speed of the mobile support during an acquisition of the width of the envelope divided by the speed of the envelope conveying multiplied by twice the minimum length of the envelope to size.

Claims data not available