Envelope flapper with adjustable blade

In an apparatus for inserting enclosures into envelopes comprising means for conveying an envelope along a flap unfolding path to an enclosure inserting location, means for unfolding the flap of the envelope as the envelope is conveyed along the flap unfolding path to the enclosure inserting location, means for holding the flap-unfolded envelope open at the enclosure inserting location, and means for moving an enclosure along an enclosure feed path to the held-open envelope and inserting the enclosure into the held-open envelope, wherein the flap unfolding means comprises a plurality of fingers each having a projection thereon for engaging the flap of an envelope moved therepast, and the flap unfolding path includes a gap having a width determined by the distance between the envelope conveying means and the projections of the fingers, an improvement comprising:

• a flapper blade adjustably mounted to at least one of the finger projections for positioning said flapper blade to extend a certain distance beyond the projection to adjust the gap width to accommodate different type envelopes.