a stacker for stacking sheets of material is provided which is mounted to the sewing bed of a sewing machine . the stacker has a support bed , a wheel assembly , and a grasping assembly . the wheel assembly advances the material over a rearward edge of the support bed to a position wherein a leading portion of the material depends therefrom while a trailing portion is held thereto by a movably motorized wheel and holding finger . the grasping assembly includes a pair of reciprocating grasping fingers mounted to a pivotably arm . in stacking the material , the grasping fingers grasp the trailing portion of the material while the arm pivots the trailing portion over the leading portion to a stacking position s .