METHOD AND APPARATUS FOR LOOPING THE OUTERMOST CONVOLUTION OF SPIRAL BINDERS FOR NOTE BOOKS OR THE LIKE

摘要

2220-11aABSTRACTA tool which loops the end portion of the outermostconvolution of a spiral wire binder around the neighboringnext-to-the-outermost convolution while the convolutions of thebinder extend through the perforations of a stack of papersheets and the binder is located in a preselected position hasa knife which trims the outermost convolution and thereuponbends the end portion of the outermost convolution to aposition of parallelism with and proximity to a stationarysurface. A looping device which is mounted at the forward endof a rotary reciprocable shaft is thereupon caused to engage thebent end portion in response to forward movement of the shaftand to loop the bent end portion by moving it along the surfaceand around the neighboring convolution in response to rotationof the shaft. The shaft is rotatable and reciprocable and theknife is movable by a set of coaxial cams which complete onerevolution in order to effect trimming of the outermostconvolution, to thereupon effect bending of the end portion ofthe trimmed convolution and to ultimately effect looping of thebent end portion. The cams are rotatable by a rack and piniondrive through the medium of a one-way clutch.- 1 -