A method and apparatus for inserting an object into an envelope in which the envelopes are stacked in a stacker. An envelope flap of the envelope is grasped by a lip on a rotary cam to open the envelope. The envelope flap of the envelope is brought into and maintained in contact with a surface of the rotary cam. The envelope is then pulled, via the envelope flap, so as to place and maintain the envelope in contact with the surface of the rotary cam. The rotary cam reverses the envelope to move the envelope into an inserting area where the envelope is detached from the surface of the rotary cam. An object is then inserted into the envelope and the envelope is then removed from the inserting area.