Folder for web-fed printing presses

Claim 1

A FOLDER MECHANISM FOR FOLDING SIGNATURES PASSING FROM A PRINTING PRESS COMPRISING: (A) A TUCKING CYLINDER AND A COOPERATING JAW CYLINDER ROTATABLY MOUNTED ON COAXIALLY-EXTENDING PARALLEL SHAFTS, (B) THE TUCKING CYLINDER HAVING AT LEAST ONE TUCKER BLADE AND THE JAW CYLINDER HAVING A CORRESPONDING NUMBER OF COOPERATING TUCKER JAWS, (C) A SPREAD-U-SHAPED CAM MEMBER SYMMETRICALLY POSITIONED WITH RESPECT TO, AND COINCIDING WITH, EACH END OF THE JAW, (D) A SPIDER FRICTIONALLY ATTACHED TO THE TUCKING CYLINDER SHAFT AT EACH END OF THE TUCKING CYLINDER AND ADAPTED TO ROTATE WITH SAID CYLINDER AND TO BE FORCEFULLY MOVED CIRCUMFERENTIALLY WITH RESPECT THERETO, EACH SPIDER BEING PROVIDED WITH AT LEAST ONE RADIALLYEXTENDING ARM FOR SUPPORTING ONE END OF THE TUCKING BLADE AND EACH OF SAID ARMS BEING PROVIDED AT ITS OUTER END WITH A CAM ROLLER ADAPTED TO COOPERATE WITH THE SAID U-SHAPED CAM MEMBER, AND (E) MEANS FOR EFFECTING CIRCUMFERENTIAL ADJUSTMENT OF THE JAW CYLINDER RELATIVE TO THE TUCKING CYLINDER AND THEREBY CAUSING THE SPIDER AND THE SUPPORTED TUCKING BLADE TO MOVE ACCORDINGLY RELATIVE TO THE TUCKING CYLINDER AND EFFECTING A CHANGE IN THE POSITION OF THE FOLD IN THE SIGNATURE.