Metal deforming – By use of 'flying tool' engaging moving work – Included in plural deforming stations or passes
Patent
1991-02-26
1992-05-26
Larson, Lowell A.
Metal deforming
By use of 'flying tool' engaging moving work
Included in plural deforming stations or passes
156124, B21F 4500
Patent
active
051156598
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process for producing corrugated wire reinforced plies for use as a component of tires to an apparatus for practicing the process.
BACKGROUND ART
Tires are known having embedded therein wires as reinforcing members to give improved cut resistance. These wires are corrugated to impart flexibility to the tire (see, for example, Unexamined Japanese Patent Publication SHO 57-2701704).
Unexamined Japanese Patent Publication SHO 52-8084 or SHO 64-75227 discloses a process and apparatus for producing such corrugated wires.
The conventional process for producing the tire component comprises arranging a multiplicity of parallel wires in a plane, passing the multiplicity of wires between a pair of gears to corrugate the assembly of wires, subsequently laying down the vertically corrugated wires into a planar arrangement by means of rollers, and thereafter covering the assembly with rubber over the upper and lower sides thereof to obtain a corrugated wire ply.
With such a conventional process for producing the tire component which handles many separate wires, the shaping of the wires by the gears is dependent largely on the tension applied to the wires immediately before and after they are fed to the gears, and the stretchability of the wires (which is dependent on the material, twist pitch, wire diameter, etc.).
However, the process disclosed in the publication SHO 64-75227 encounters difficulty in shaping the wires because they are subjected to definite tension only immediately before feeding to the gears.
Further, since the individual wires are freely movable until the wire arrangement is covered with rubber in the final step, the conventional process is liable to the serious trouble of some wires crossing other wise owing to a difference in stretchablity between the wires or to inaccurate positioning of the wires relative to one another.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a process and an apparatus for producing a tire component by uniformly shaping wires without permitting crossing of the wires.
To fulfill the above object, the wires are shaped restrained from moving freely according to the present invention.
The process of the present invention is characterized by passing a wire sheet between a pair of gear-shaped rolls in meshing engagement therewith to vertically corrugate the sheet, the wire sheet comprising wires arranged side by side in a plane and covered with an elastic material, and passing the shaped sheet between a pair of rolls to lay down the shaped vertical corrugations into a planar arrangement.
The apparatus of the present invention is characterized in that it comprises a pair of gear-shaped rolls for passing a wire sheet therebetween in meshing engagement therewith to vertically corrugate the sheet, the wire sheet comprising wires arranged side by side in a plane and covered with an elasticc material, and a pair of rolls for passing the shaped wire sheet therebetween to lay down the vertical corrugations into a planar arrangement.
The resultant component which is suitable for tires is produced by the process and apparatus of the present invention from a wire sheet which comprises wires arranged side by side in a plane and covered with an elastic material.
Thus, more specifically, the wire sheet is passed between the pair of gear-shaped rolls which are in meshing engagement therewith and thereby vertically corrugated, and is subsequently passed between another pair of rolls, whereby the vertical corrugations are laid down into a planar arrangement.
Previously, where wire sheet was corrugated, there was a problem as to whether the corrugations could be laid down laterally. This was thought impossible, but this invention overturns this common knowledge.
Thus, by the invention when a multiplicity of hard wires covered with unvulcanized rubber or like elastic material in the form of a wire sheet are vertically corrugated and then laterally laid down, the wires can be held laid down to form
REFERENCES:
patent: 2179374 (1939-11-01), Kraft
patent: 2538644 (1951-01-01), Guess
Larson Lowell A.
Sumitomo Rubber Industries
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