A feed mechanism is disclosed for feeding sheets from a sheet store, comprising:, a reversible feed assembly arranged to feed sheets out of and, upon reversal, into the sheet store; and a separator assembly arranged to receive sheets from the reversible feed assembly and adapted to pass sheets singly into a transport path. The separator assembly comprises: a first rotatable separator member arranged to be driven, in use, towards the transport path and being provided with first retardation means for at least decelerating rotation in the opposite sense; a second rotatable separator member (321) opposing the first to define a nip therebetween, the second rotatable separator (321) member being freely rotatable towards the reversible feed assembly, and having second retardation means for at least decelerating rotation in the opposite sense. Reversal of a sheet out of the nip by the reversible feed assembly causes rotation of the second rotatable member. A sheet feeding method is also disclosed.