Transfer device for folder unit

Abstract

In a transfer device R, which feeds a first web group W 20 obtained by overlapping a plurality of webs and vertically folding them in a half width by a former F 11 and a second web group W 10 of a plurality of overlapped webs in the same width dimension as that of the first web group W 20 vertically folded by the former F 11 in mutual overlap between a cutting cylinder C 1 and a folding cylinder C 2 , so as to form a newspaper signature, wherein at least one transfer roller R 1 , R 2 , R 3 , or R 3 ′ is provided for guiding the second web group W 10 to a position at which it is overlapped on the first web group W 20 and at least one out of the transfer rollers is rotationally driven, at least one of the transfer rollers to be driven is a roller having a step formed at a peripheral surface in a range in contact with the web while circumferential surfaces having different diameters in an axial direction are adjacent to each other, thus providing the transfer device for a folder unit capable of applying an appropriate tension to each of the webs constituting the web group, so as to prevent the web from being deviated or meandering.

1 . A transfer device for a folder unit, which feeds a first web group obtained by overlapping a plurality of webs and vertically folding them in a half width by a former and a second web group of a plurality of overlapped webs in the same width dimension as that of the first web group vertically folded by the former in mutual overlap between a cutting cylinder and a folding cylinder, so as to form a newspaper signature, wherein at least one transfer roller is provided for guiding the second web group to a position at which it is overlapped on the first web group, at least one out of the transfer rollers being rotationally driven, the transfer device for a folder unit comprising:
 at least one of the transfer rollers to be driven being a roller having a step formed at a peripheral surface in a range in contact with the web while circumferential surfaces having different diameters in an axial direction are adjacent to each other.   
   
   
       2 . The transfer device for a folder unit according to  claim 1 , wherein the two transfer rollers to be driven approach each other, at least either one of the transfer rollers is a roller having a step formed at a peripheral surface in a range in contact with the web while circumferential surfaces having different diameters in an axial direction are adjacent to each other, and further, at least one arrangement is provided in such a manner that one transfer roller is brought into contact with one side of the second web group ( 10 ) with certain central angle and the other transfer roller is brought into contact with the other side of the second web group (W 10 ) respectively with certain central angle. 
   
   
       3 . The transfer device for a folder unit according to  claim 1  or  claim 2 , wherein large-diameter portions are arranged at the circumferential surface having the different diameters substantially symmetrically with respect to a center in a width direction of the web. 
   
   
       4 . The transfer device for a folder unit according to  claim 1  or  claim 2 , wherein a ratio of a large-diameter portion to a small-diameter portion in an axial direction range at the circumferential surface having the different diameters is equal to or smaller than the small-diameter portion. 
   
   
       5 . The transfer device for a folder unit according to  claim 1  or  claim 2 , wherein a circumferential surface of a large-diameter portion at the circumferential surface having the different diameters is subjected to surface treatment for increasing a friction coefficient.