| 摘要 |
A web-fed printing press for newspaper production has a cutter cylinder( F 1 ) for cutting a printed paper web ( W ) into sections ( FS ) while the web is riding on a folding cylinder ( F 2 ). Each web section is subsequently folded into a signature by having its midpart inserted by a folding blade ( F 23 ) on the folding cylinder into a jaw cavity (11) in a jaw cylinder ( F 3 ). A series of movable jaw parts (12) are mounted in each jaw cavity for movement toward and away from a series of fixed jaw parts (13) in order to engage and fold the inserted midpart of the web section. In order to firmly engage each web section ( FS ) without causing ink offset between its contacting surfaces, the two outmost movable jaw parts (12 s ) which are to engage the pair of margins ( FSN ) of each web section are less spaced from the fixed jaw parts (13) than are the medial movable jaw parts (12 c ) which are to engage the image area ( FSP ) of each web section. |
