Envelope stacking system

Claim 1

An envelope stacking system for receiving envelopes being transported in seriatim along a feed path and stacking said envelopes in a contiguous stack, said envelopes being transported and stacked with a vertical orientation, said envelope stacking system, comprising: means defining an envelope feed path; transporting means disposed along said feed path for feeding envelopes in seriatim to a stacking deck, said transporting means feeding said envelopes with a vertical orientation; a stacking deck for supporting a stack of vertically oriented envelopes, said deck having means defining an inlet window, said inlet window comprising a guide wall for guiding incoming envelopes, said guide wall having an angle bend; driving means adjacent said guid wall for recieving incoming envelopes and thrusting them along said guide wall toward a rear portion of said guide wall causing said incoming envelopes to bend to conform to the angle bend of said guide wall; oscillating camming means diposed adjacent and coaxially with said driving means for moving a newly received envelope agaist the stack of envelopes disposed on said deck, said oscillating camming means holding the newly received envelope against the stack until a subsequent envelope is transported to the stacking deck and approaches the inlet window, the holding of said newly received envelope against the stack serving the dual prupose of eliminating contact of said stack of envelopes with said driving means to prevent wear upon the envelopes of said stack, and in order to clear said inlet window and provide an open inlet for a subsequent incoming envelope; and biasing means supported by the deck for biasing the stack of envelopes toward said driving means.