Abstract: In an envelope edge slitter having a base, apparatus for feeding the envelopes one-by-one from the bottom of a stack at an input station to slitter blades in which an endless elastic belt extending around an eccentric pulley has an upper reach disposed in a slot n the base at the input station. The eccentricity of the pulley alternately brings the belt into and out of engagement with the lowermost envelope in the stack while the elasticity of the belt, the eccentricity of the pulley and the speed with which the belt is driven are such as to produce a whipping action of the upper reach of the belt which ensures that adjacent envelopes of the stack are separated and are fed one-by-one to the slitter blades.

Abstract: Envelope opening apparatus in which envelopes with previously slit top edges are supplied, one at a time, to a conveyor belt at a feeder station and are carried by the conveyor belt to an end slitting station in which each envelope is arrested, the faces of the arrested envelope are spread apart, and a pair of bursting members mounted for rectilinear movement in rectangular paths move downward into the envelope through its pre-slit top edge and outward against the respective envelope ends to burst them. Envelopes whose ends have been broken or burst are moved into successive radial slots of a rotary storage member for holding while the contents of the envelopes are removed and sorted.