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Stitcher Wire Control Tube and Guide

IP.com Disclosure Number: IPCOM000038988D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 3 page(s) / 39K

Publishing Venue

IBM

Related People

Colglazier, DF: AUTHOR [+3]

Abstract

During stitcher operation, the wire draw operation involves rapidly pulling the desired length of wire from a supply spool by the stitcher mechanism. This rapid pull of wire from the spool often causes the spool to spin and overshoot, creating loose wire on the spool and sometimes causing a "birdnest" of wire. When wire pull is spread out in a gentle way, by providing a wire guide tube that has an effective spring rate such that the pull of the wire causes deformation of the guide, a too rapid pull of wire from the spool does not occur. A spool of wire 10 is associated with a rigid control tube 11. Tube 11 is a hollow metal tube that the wire is guided through, as the wire extends from the spool to an area below stitcher assembly 12.

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Stitcher Wire Control Tube and Guide

During stitcher operation, the wire draw operation involves rapidly pulling the desired length of wire from a supply spool by the stitcher mechanism. This rapid pull of wire from the spool often causes the spool to spin and overshoot, creating loose wire on the spool and sometimes causing a "birdnest" of wire. When wire pull is spread out in a gentle way, by providing a wire guide tube that has an effective spring rate such that the pull of the wire causes deformation of the guide, a too rapid pull of wire from the spool does not occur. A spool of wire 10 is associated with a rigid control tube 11. Tube 11 is a hollow metal tube that the wire is guided through, as the wire extends from the spool to an area below stitcher assembly 12. As wire 13 is rapidly pulled by the stitcher assembly, the free end 14 of the wire tube is pulled up toward the spool, while the spool advances very little due to the inertia and drag of the spool assembly. The force from the tube then more slowly pulls the wire from the spool. Another aspect of wire control that is needed is the elimination of any wire kinking. If the wire is deformed, especially if it is deformed in an erratic manner, this deformity will cause problems in the stitcher. Such problems may have the symptoms of improper mating of the wire to the stitcher components, wire thrown by the stitcher's swivel, wire jams, etc. The disclosed arrangement eliminates wire deformation by several means. The wire tube maintains a wire angle which is approximately tangent to the spool as the wire exits the spool. Deformation is also eliminated by controlling the minimum radii of the wire tube so that the wire is not plastically deformed even after residing in the tube for extended periods of time. Also, a wire guide 15 is attached to the stitcher head and guides the wire into the stitcher in a manner such that the wire does not deform to its plastic point; i.e., the radii of the guide do not plastically deform the wire. The curvature of the guide is such that whether the stitcher assembly is at the left (10-inch paper) position, the right (14-inch paper) position, or anywhere in between, the wire is always guided such that the wire is not bent tighter than the smallest radius of the guide. This guide has a radius on its wire control surface that prevents the deformation of the wire....