Abstract: The present invention deals with a microprocessor implemented method and system suitable for use in a mail sorting machine to sort the envelopes into common groups, assign each group a particular sort bin and generate a coded bin designation signal. The envelopes to be sorted are run through the machine in two passes. During the first pass, the system causes each of the envelopes to be deposited in a designated sort bin in accordance with a sort table which was programmed into the microprocessor prior to the first pass. The microprocessor also compiles a list of the zip codes of each envelope moving through the machine and maintains a count of the number of envelopes having each zip code. Once the first pass is completed, the microprocessor assembles the compiled zip codes into common groups and assigns each group a bin location. The microprocessor then assembles the bin locations into a sort table and outputs a list of loading instructions.

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: Apparatus for successively delivering envelopes from a stack of envelopes arranged on edge on a support to a conveyor belt disposed below one edge of the support. The stack is urged by a driven feeder into engagement with an abutment extending across and slightly above the support adjacent to the support edge and into engagement with a retainer bar spaced above the support by a distance somewhat less than the height of the smallest envelope to be handled. A suction device first engages the leading envelope of the stack to pull it over the abutment and then to pull the lower edge forwardly over a stripper element to ensure that any envelope stuck to the leading envelope is stripped therefrom. Subsequently, the suction device moves downwardly to pull the leading envelope out from under the retainer bar and then releases it to permit it to fall to the conveyor. The driven feeder provides a controlled force for urging the envelopes against the abutment and the retainer bar.

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.