Pivotable knife
AssigneeThe Firestone Tire & Rubber Company
InventorsDonald O. Still, Hubert T. Hovance, George J. Burley
Life of this patent
Estimating the term…
Abstract
A means and method for applying a stabilizer ply to a tire building drum and more particularly a means and method for cutting and applying the stabilizer ply material and specifically means for cutting the stabilizer ply material between cords disposed therein and correcting for variations of the cord angles during the application process in order to provide an improved splice between the leading and trailing edges of the stabilizer ply material.
Claims11
An apparatus for severing a planar material comprised of:
- a. rail means disposed proximate to at least a portion of said planar material;
- b. transport means operatively associated with said rail means and adapted to be moved along said rail means;
- c. pivot means affixed to said transport means and pivotable in a plane parallel to the plane of said planar material;
- d. knife means associated with said pivot means in order to pivotally affix said knife means to said transport means;
- and
- e. means for measuring the angular displacement of said pivot means.
In an apparatus for transporting a knife through a planar material having reinforcing cords disposed therein, whereby a rail means is used in conjunction with a carriage means to transport said knife, the improvement comprising:
- linkage means for mounting said knife on said carriage means wherein said linkage means includes at least four links and allows said knife to pivot in a plane parallel to the plane of said planar material.
A method for cutting a planar material having reinforcing members therein utilizing a pivotable knife means adapted to be displaced relative to said planar material in a plane parallel to the plane of said planar material, whereby a rail means is used in conjunction with a carriage means to transport said knife, and includes linkage means for mounting said knife on said carriage means wherein said linkage means includes at least four links, comprising the steps of:
- a. plunging said knife means into said planar material between two or more reinforcing members;
- b. displacing said knife means relative to said planar material;
- c. pivoting said knife means in order to facilitate the displacement of said knife means between said reinforcing means;
- and
- d. determining the angle of cut made by said knife means.
Dependencies are inferred from the claim text.