against the throat 60 by virtue of the steady unvarying pressure exerted by the presser foot 10 this continues to occur until the needle is actually withdrawn from the workpiece whereupon the housing 30 again makes contact with the shock absorbent ring 36 and begins to lift the presser foot 10 off the workpiece the workpiece 58 is now free to be repositioned for the next subsequent stitch which will take place during the next sewing cycle the repositioned workpiece may in fact produce a different thickness of material to be sewn this will merely result in a different level of contact being experienced by the presser foot 10 the presser foot 10 will again produce a steady downward pressure at this level while the needle proceeds through the workpiece as can be appreciated the presser foot 10 is normally maintained at the end of the needle 12 when the needle is not in the workpiece this allows for an initial contact of the presser foot with the workpiece prior to any needle penetration provision has however been made to withdraw the presser foot 10 relative to the needle 12 so as to allow for the threading of the needle referring to fig1 a cantilevered leaf spring 62 is attached to the heel of the presser foot 10 the leaf spring 62 contains a keyhole 64 which will engage a pin 66 on the base 32 the pin 66 is not actually visible in fig1 but can be readily seen in fig4 fig4 additionally illustrates the relative position of the leaf spring 62 to both the heel of the presser foot 10 as well as the rearward portion.