Sheet feeder with sheet forming means

A sheet feeding device comprising

• an elevator for a stack of sheets,
• and an air supply system configured to supply and direct one of more air streams towards an upper region of the sheet feeding device for floating a plurality of upper sheets of the stack of sheets,
• wherein the elevator comprises a vertically movable support for supporting the stack of sheets from below,
• wherein the sheet feeding device comprises a first side support member and a second side support member configured to sideways support respective opposite sides of the stack of sheets,
• wherein the sheet feeding device further comprises a vacuum belt feeder provided above the elevator and configured to grab and feed away an uppermost sheet of the floated sheets,
• and wherein an upper portion of each side support member is provided with at least one respective cam comprising a respective stepped guiding surface extending obliquely upwards-inwards from the respective side support member, and wherein steps of the stepped guiding surface extend substantially horizontally, such that a vertically stepped guiding surface is provided.