Papering apparatus in rotary printing press

In printing press apparatus of the class in which a web of printed paper is moved from a printing section through a slitting section to a former, said slitting section comprising first slitter means for slitting said web longitudinally into two partial webs of equal widths one of which partial webs is passed through a turning-bar section on its way to said former so that both said partial webs are in laterally-aligned superposed relation with each other upon reaching the former, means for accomplishing initial threading of said one partial web through said turning-bar section, comprising:

• controllable second slitter means in said slitting section for slitting said web longitudinally into two partial webs of different widths, the wider of said partial webs of different widths being the one which is to be threaded through said turning-bar section;
• endless double-threading-belt means and means for driving said double-threading belt means along the path of the margin of the slit edge of said wider partial web from the entrance to said turning-bar section through said turning-bar section to said former, said belt means grasping said margin of said wider partial web and threading said wider partial web through said turning-bar section into proper laterally-aligned superposed relation with the narrower of said partial webs of different widths, said double threading-belt means comprising two component belts which are separable to form a nipping section for receiving said margin of said wider partial web and which are reclosable to each other to nip said margin between them and accomplish said grasping thereof;
• controllable transverse cutter means for producing a transverse cut extending between the longitudinal line of slitting of said first slitter means and the longitudinal line of slitting of second slitter means;
• and
• control means for controlling the timing of operation of said first and second slitter means and of said transverse cutter means such that said second slitter means operates on the leading portion of said web to divide it into said two partial webs of different widths until the slit formed by it intersects said transverse cut, and said first slitter means operates to form a longitudinal slit dividing said web into said two partial webs of equal thickness beginning at said transverse cut and continuing thereafter during the subsequent normal operation of said press, whereby the slits formed by said first and second slitter means are joined by said transverse cut to form a single continuous slit.