Patent ID: 8287205
Filing Date: 2012-10-16
Classification: B42B

Abstract:
1. A method for binding a book comprising: forming a collated book having a stack of overlying aligned pages with aligned holes in the pages arranged along one edge of the book; providing a helical coil arranged with a length along an axis of the coil to extend along the edge of the book and arranged with a required pitch of the coil such that respective turns of the coil pass through respective ones of the holes; the coil being formed from a length of a cylindrical filament of plastics material so as to define at a leading end of the filament a circular leading end surface of the filament, which is generally transverse to a longitudinal axis of the filament, and a cylindrical peripheral surface surrounding the filament; arranging the coil to locate the leading end of the coil at a first end of the edge of the book; and driving the coil in rotation about the axis of the coil such that the leading end of the coil enters a first of the holes at the first end of the book and is threaded through the holes in the book by entering in turn each of the holes until the coil is threaded through all of the holes; each of the holes having a first end of the hole which is that end of the hole closest to the first end of the book, a second end of the hole opposite the first end and two sides; wherein the leading end of the coil is formed so as to define a leading apex and said leading end surface inclined rearwardly from the leading apex along the filament and across the filament to the circular peripheral surface of the filament; the circular leading end surface of the filament being cut at an angle different from 90 degrees to the longitudinal axis of the filament across the filament; so as to form the leading apex of the leading end at the circular peripheral surface of the filament at one side of the circular end surface; and so that the circular leading end surface extends across the filament from said leading apex at said circular peripheral surface at said one side to a diametrically opposed side of the circular peripheral surface; and wherein the leading apex is arranged on the leading end such that, as the leading end enters each of the holes in turn, the leading apex is located on the leading end at a position thereon spaced from the first end of the hole and the circular leading end surface extends from the leading apex toward the first end of the hole.