Mail registration and feeding apparatus

This invention concerns a feeding and advancing apparatus in a document processing machine for aligning and registering flat articles against a registration wall. The articles are advanced through a first feeding apparatus that pushes them towards a registration wall, and a second feeding apparatus advances them along a second direction substantially orthogonal in relationship to the first feeding apparatus when a registration sensing system causes the second drive system to engage the articles. If there is not registration of the articles at the registration wall, the first feeding apparatus will re-establish the prior registration condition when the second feeding apparatus is disengaged. Then, the first feeding apparatus will re-establish registration. Once the articles are re-registered, the second feeding apparatus will be engaged to continue advancing the articles along the second direction to the desired downstream location.