Importance

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Abstract

A tool which loops the end portion of the outermost convolution of a spiral wire binder around the neighboring next-to-the-outermost convolution while the convolutions of the binder extend through the perforations of a stack of paper sheets and the binder is located in a preselected position has a knife which trims the outermost convolution and thereupon bends the end portion of the outermost convolution to a position of parallelism with and proximity to a stationary surface. A looping device which is mounted at the forward end of a rotary reciprocable shaft is thereupon caused to engage the bent end portion in response to forward movement of the shaft and to loop the bent end portion by moving it along the surface and around the neighboring convolution in response to rotation of the shaft. The shaft is rotatable and reciprocable and the knife is movable by a set of coaxial cams which complete one revolution in order to effect trimming of the outermost convolution, to thereupon effect bending of the end portion of the trimmed convolution and to ultimately effect looping of the bent end portion. The cams are rotatable by a rack and pinion drive through the medium of a one-way clutch.

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First Claim