Method and machine for locating variations in tension in a saw blade
AssigneeRemington Arms Company, Inc.
InventorChester H. Dawson
Life of this patent
Estimating the term…
Abstract
A method and machine for hammering circular saw blades automatically, to correct uneven distributions of residual stresses, and distortions of the blade surfaces from true planes, so that the blades will run true. This operation has previously only been performed manually, by highly-skilled craftsmen. The saw blade is elastically deflected so that its normally-planar surface lies in a curved surface of a predetermined contour. A proximity sensor passes over the blade to detect deviations of its surface from the predetermined contour, which occur at points of uneven stress distribution or surface distortion. At such points, the blade is arrested and hammered until the fault is corrected.
Claims11
A machine for locating variations in tension in a saw blade, said machine comprising:
- carriage means constructed and arranged for mounting and elastically bowing a saw blade having a normally-planar major surface to deflect said surface toward the locus of a segment of the surface of a curved geometric solid having a specifically preselected contour, to which said blade surface would conform if the blade is properly tensioned and straightened;
- sensor means constructed and arranged for response to variations in its distance from the nearest area of said blade surface;
- and means constructed and arranged for supporting said sensor means and said carriage means for relative movement of said sensor means with respect to said curved locus at a predetermined substantially uniform distance therefrom;
- said sensor means being operatively connected to produce a signal only in response to a substantial variation in its distance from said blade surface occasioned by a local deviation of said blade surface from said curved locus.
A machine for locating variations in tension in a circular saw blade having a major axis, said machine comprising:
- carriage means constructed and arranged for mounting and elastically bowing a saw blade having a normally-planar major surface to deflect said surface toward the locus of a segment of the surface of a curved geometric solid having a specifically preselected contour, to which said blade surface would conform if the blade is properly tensioned and straightened;
- sensor means constructed and arranged for detecting local deviations of said blade surface from said locus only in a limited local area of the blade surface at a time;
- and means supporting said sensor means and said carriage means in operative relation for detection of said local deviations by said sensor means, said supporting means being constructed and arranged to support said carriage means and said sensor means for relative reciprocatory movement therebetween, and including means for rotating said saw blade about said major axis, to cause said sensor means to locate said local deviations in a larger area of said blade surface sequentially.
A method of locating variations in tension in a saw blade having a normally-planar surface, comprising the steps of elastically bowing the blade to cause said surface thereof to deflect toward the locus of a segment of the surface of a curved geometric solid having a specifically preselected contour, to which said blade surface would conform if the blade is properly tensioned and straightened;
- selecting sensor means responsive to produce a signal only in response to a substantial variation in its distance from the nearest area of said blade surface;
- and moving said sensor means relative to said curved locus at a predetermined substantially uniform distance therefrom, to detect local deviations of said blade surface from said curved locus.
Dependencies are inferred from the claim text.