Single sheet feeding mechanism

A suction head for a paper sheet feeder mechanism comprising rigid piping means secured to articulated arm means, axial aperture means through said piping means in fluid communication with vacuum pumping means for drawing atmospheric air through said aperture means comprising internally, threaded bore means disposed at the distal end of said piping means, rigid sealing face means terminating said piping means around said bore means, T-nut means having a flared compression surface of one end of an externally threaded shank for turning into said threaded bore means, rigid cup means having a cylindrical wall terminated at one axial end by a transverse bottom wall, said bottom wall having an axial aperture therethrough for receiving the shank of said T-nut means, an annular segment of said bottom wall means around said axial aperture finished to sealably engage said piping means sealing face, elastomer bellows means having convolutes axially disposed between an open mouth portion and an axially apertured base portion, said convolutes having an external diameter less than said rigid cup wall, said base portion aperture sized to axially receive therewithin and seal thereabout said T-nut shank and confinement ring means disposed externally of said bellows base portion for confining said base portion radially in a space between said confinement ring means and said cup bottom wall when said T-nut shank is turned into said threaded bore means.