Overlapping letters detection device for automatic letter handling detects interruption of light barrier by overlapping letter upon deflection of leading letter

摘要

The device has a light barrier (5) directed across the transport path for the letters, so that it is interrupted by an overlapping letter (2), when the leading letter (1) is deflected from the path of the light barrier by a deflection device, for providing an overlap indication signal when the light barrier is interrupted within a time window defined by the length of the individual letters and the letter transport rate.