Method and apparatus for manufacturing a singles ring yarn

A process for manufacturing a singles ring yarn, comprising:

• supplying a first twist to a strand of traveling drafted fibers at a false twist device for producing a preliminary singles yarn, wherein the false twist device rotates at a first speed for twisting the fibers:
• immediately after the first twisting step, supplying to the preliminary singles yarn a joint twist of a second twist in the same direction as the first twist and a third twist in a reversed direction for producing a final singles ring yarn, wherein the second twist is produced by a rotatable take-up package into which the final singles yarn is drawn, wherein the reversed twist results in correspondence to the first twist, and wherein the take-up package rotates at a second speed;
• drawing the final singles yarn into the take-un package;
• controlling a ratio of the first speed to the second speed for controlling the amount of a residual torque in the final singles ring yarn;
• and
• driving a driving system to rotate by a rotating ring spindle, on which the take-up package is centered, transmitting rotational forces from the ring spindle to the false twist device, and wherein the driving system has a controllable transmission ratio depending upon a desired residual torque in the final singles ring yarn.

An apparatus for manufacturing a singles ring yarn, comprising:

• a false twist device rotating at a first speed for supplying a first twist to a strand of traveling drafted fibers such that at a preliminary singles yarn is produced;
• and
• a take-up package rotating at a second speed for supplying a second twist in the same direction as the first twist to the preliminary singles yarn,
• wherein the manufactured singles ring yarn is to be drawn onto the take-up package, wherein a joint twist of the second twist and a third twist in a reversed direction are supplied to the preliminary singles yarn for producing a final singles ring yarn, wherein the reversed twist results in correspondence to the first twist, and wherein a ratio of the first speed to the second speed is controllable such that the amount of a residual torque in the final singles ring yarn can be controlled.

An apparatus for manufacturing a singles ring yarn, comprising:

• a false twist device rotating at a first speed for supplying a first twist to a strand of traveling drafted fibers such that at a preliminary singles yarn is produced;
• a take-up package rotating at a second speed for supplying a second twist in the same direction as the first twist to the preliminary singles yarn,
• wherein the manufactured singles ring yarn is to be drawn onto the take-un package, wherein a joint twist of the second twist and a third twist in a reversed direction are supplied to the preliminary singles yarn for producing a final singles ring yarn, wherein the reversed twist results in correspondence to the first twist, and wherein a ratio of the first speed to the second speed is controllable such that the amount of a residual torque in the final singles ring yarn can be controlled;
• and
• a driving system for transmitting rotational forces from a rotating ring spindle, on which the take-up package is centered, to the false twist device, wherein the driving system has a controllable transmission ratio depending upon a desired residual torque in the final singles ring yarn.