Spinning ring for a ring spinning machine and method of manufacturing thereof

A spinning ring provided with a ring flange portion, which permits a ring traveller to run thereon in a sliding contact condition,

• the ring flange portion composed of an inner flange and an outer flange,
• the inner flange being formed with a curved surface of predetermined shape, which is formed by folding back an inner peripheral portion of a doughnut-shaped disk blank toward an outer peripheral side of the blank and bending the inner peripheral portion of the folded-back blank upward and which is disposed on the bent, inner peripheral portion to define a running surface of the traveller, and with a fitting portion, which is disposed on the outer peripheral side of the blank to fit onto the outer flange,
• the outer flange being formed integral with a mount portion, which is mounted to a ring rail or a ring holder through a neck portion, and being provided on an inner peripheral side thereof with a fitting portion, which is adapted to be fitted onto the inner flange, and on an outer peripheral side thereof with an engaging portion, which is adapted to engage with the foot portion of the ring traveller,
• the inner flange and the outer flange fitting together and being integrated together by a securing means.

A method of manufacturing a spinning ring for a ring spinning machine provided with a ring flange portion, which permits a ring traveller to run thereon in a sliding contact condition, the spinning ring being composed of an inner flange formed from a thin sheet material by press work and an outer flange integral with a mount portion, which is mounted to a ring rail or a ring holder,

• the inner flange being formed into a predetermined shape sequentially through the step of punching a thin sheet material to form a circular-shaped disk blank, the burring prepared hole forming step of punching a central portion of the circular-shaped disk blank to form a doughnut-shaped disk blank, the burring step of bending an inner peripheral portion of the doughnut-shaped disk blank upright in a flange manner, the folding-back step of folding back the bent, inner peripheral portion of the doughnut-shaped blank toward an outer periphery of the blank to vertically overlap the same on the outer periphery to form a running surface of the traveller on the inner peripheral portion in the folded-back state, and the trimming step of punching the doughnut-shaped blank, on which the running surface of the traveller is formed through the folding-back step, to a predetermined outer diameter dimension,
• the outer flange integral with the mount portion being formed integrally from a cylindrical-shaped stock material by cutting or rolling,
• the inner flange thus formed being integrally secured to a fitting portion, which is formed on an outer peripheral side of the outer flange, by a securing type or detachable type securing means.

A method of manufacturing a spinning ring for a ring spinning machine provided with a ring flange portion, which permits a ring traveller to run thereon in a sliding contact condition, the spinning ring being composed of an inner flange formed from a thin sheet material by press work and an outer flange integral with a mount portion, which is mounted to a ring rail or a ring holder,

• the inner flange being formed into a predetermined shape sequentially through the step of punching a thin sheet material to form a circular-shaped disk blank, the burring prepared hole forming step of punching a central portion of the circular-shaped disk blank to form a doughnut-shaped disk blank, the burring step of bending an inner peripheral portion of the doughnut-shaped disk blank upright in a flange manner, the folding-back step of folding back the bent, inner peripheral portion of the doughnut-shaped blank toward an outer periphery of the blank to vertically overlap the same on the outer periphery, the bending step of bending the folded-back, inner peripheral portion of the blank upward to form a curved surface of predetermined shape, which defines a running surface of the traveller on the bent, inner peripheral portion, and the trimming step of punching the doughnut-shaped blank, on which the running surface of the traveller is formed through the folding-back step, to a predetermined outer diameter dimension,
• the outer flange integral with the mount portion being formed integrally from a cylindrical-shaped stock material by cutting or rolling,
• the inner flange thus formed being integrally secured to a fitting portion, which is formed on an outer peripheral side of the outer flange, by a securing type or detachable type securing means.