Method of processing web edge
View Patent ↗A web processing apparatus has a cutting mechanism for cutting elongate webs of different widths from a raw web, a core rotating mechanism for selectively holding cores having different diameters and different axial lengths and rotating a selected one of the cores in opposite directions, a winding mechanism for supporting one of the elongate webs on an outer circumferential surface of the core to wind the elongate web in different winding directions when the core is rotated, and a cutting mechanism for cutting an end of the elongate web to produce a roll after the elongate web is wound around the core.
1. A method of processing a web edge produced when a raw web is cut, comprising the steps of:
automatically winding said web edge around an edge winding shaft;
calculating an allowable wound length of said web edge to be wound around said edge winding shaft;
automatically cutting off said web edge after said web edge is wound to said allowable wound length around said edge winding shaft;
automatically removing the web edge which is cut off from said edge winding shaft;
calculating a fully wound length of said web edge based on an allowable weight of said web edge;
calculating a maximum wound length of said web edge based on a maximum wound diameter of said web edge; and
comparing the calculated fully wound length and the calculated maximum wound length with each other, and setting a shorter one of the calculated fully wound length and the calculated maximum wound length as said allowable wound length.
2. A method according to claim 1 , further comprising the steps of:
drawing a predetermined length of said web edge upstream of said edge winding shaft after said web edge is wound around said edge winding shaft;
gripping the drawn length of said web edge with a roller pair; and
rotating said roller pair to deliver the drawn length of said web edge to said edge winding shaft after the web edge which is cut off is removed from said edge winding shaft.
3. A method according to claim 1 , further comprising:
radially contracting said edge winding shaft and moving said web edge axially of said edge winding shaft to automatically discharge said web edge from said edge winding shaft after said web edge is cut off.