Web traveling position regulating method, web manufacturing method, web conveying device and web cutting device

Abstract

The present invention provides a web traveling position regulating method, a web manufacturing method and a web conveying device that, without relying on a roller whose peripheral surface is crown-shaped, can carry out transverse direction position regulation of a web that travels, and provides a web cutting device to which the web conveying device is applied and that, by a simple structure, can carry out transverse direction position regulation of plural webs that travel.

1 . A web traveling position regulating method comprising training a web around a peripheral surface at a roller, which peripheral surface forms a concave shape at which an axial direction center has a smaller diameter than axial direction end portions, and causing the web to travel while sliding the web with respect to the roller, thereby regulating a traveling position in a transverse direction of the web. 
     
     
         2 . The web traveling position regulating method of  claim 1 , wherein the web is made to travel while being slid with respect to the roller, by driving and rotating the roller such that a peripheral speed of the peripheral surface of the roller is faster than a traveling speed of the web. 
     
     
         3 . A web manufacturing method comprising:
 training a web around a peripheral surface at a roller, which peripheral surface forms a concave shape at which an axial direction center has a smaller diameter than axial direction end portions,   causing the web to travel while sliding the web with respect to the roller, and regulating a traveling position in a transverse direction of the web; and   taking-up the regulated web coaxially.   
     
     
         4 . The web manufacturing method of  claim 3 , further comprising:
 drawing-out a web original sheet; and   dividing the web original sheet in the transverse direction and cutting the web original sheet into a plurality of webs.   
     
     
         5 . The web manufacturing method of  claim 3 , wherein the web is made to travel while being slid with respect to the roller, by driving and rotating the roller such that a peripheral speed of the peripheral surface of the roller is faster than a traveling speed of the web. 
     
     
         6 . A web conveying device comprising:
 a web traveling section that causes a web to travel in a longitudinal direction;   a roller provided at a traveling path of the web by the web traveling section, and having a concave peripheral surface at which an axial direction center has a smaller diameter than axial direction end portions, the web being trained around the peripheral surface; and   roller driving means driving and rotating the roller at a speed at which sliding of the web with respect to the roller arises.   
     
     
         7 . The web conveying device of  claim 6 , wherein the roller driving means is structured so as to drive and rotate the roller such that, at least when a traveling speed of the web is less than a predetermined speed, a peripheral speed of the peripheral surface of the roller is faster than the traveling speed of the web. 
     
     
         8 . A web cutting device comprising:
 a draw-out section for drawing-out a web original sheet;   a cutting section that divides the web original sheet in a transverse direction and cuts the web original sheet into a plurality of webs;   a take-up section for coaxially taking-up at least two or more webs among the webs that are formed by cutting at the cutting section; and   the web conveying device of  claim 6  that is applied such that, due to the web traveling section, the web original sheet is drawn-out from the draw-out section and the webs are taken-up at the take-up section,   wherein the roller that structures the web conveying device is structured such that a plurality of the concave peripheral surfaces, at which the at least two or more webs that are to be taken-up at the take-up section are trained independently, are disposed in parallel in an axial direction.