of the buckle chute, or in a second position, for preventing the leading edge of said at least one sheet or the folded piece from entering the channel and further directing the leading edge toward the second driving mechanism.
According to the present invention, the adjustment mechanism comprises a screw system threadably engaged with the stop for moving the stop. The stop has a left end and a right end adjacent the left side and the right side of the turn chute, and the screw system comprises a first lead screw disposed near the left side for operatively engaging with the left end of the stop, and a second lead screw disposed near the right side for operatively engaging with the right end of the stop, and wherein thefirst and second lead screws are mechanically linked to each other such that the first and second lead screws can be caused to turn simultaneously for moving both ends of the stop by a substantially equal distance for adjusting the separation length.
According to the present invention, each end of the stop has an engagement mechanism for threadably engaging with the respective lead screw so that each end of the stop can be independently disengaged from the respective lead screw.
According to the present invention, the engagement mechanism comprises a split nut having grooves for engaging with the threads on the respective lead screw. In particular, the engagement mechanism comprises a first mount fixedly mounted to the first end of the stop; a second mount, movably mounted to the first