Ring spinning frame with clamping device at the spindle

A spinning frame comprising:

• a drafting unit driven by a drafting unit drive for delivering yarn;
• a spindle driven by a spindle drive;
• a ring rail driven by a ring rail drive, the ring rail located between the drafting unit and the spindle;
• a clamping device for the yarn located proximate to the spindle;
• a cop located proximate to the ring rail;
• and
• a control unit linking the drafting unit drive, the spindle drive, and the ring rail drive, the control unit having a power section, the control unit configured to control the drafting unit drive to obtain a modified amount of draft at the end of the cop travel during the braking process of the drafting unit drive and of the spindle drive.

A method for controlling a ring spinning frame having a drafting unit, a spindle, and a ring rail with respective drives, the drives controlled by a control unit. Said method comprising the steps of:

• providing a clamping device for a yarn in a position below a cop on the spindle;
• forming a reverse winding of yarn during a last phase of downward movement of the ring rail;
• bringing the yarn to the clamping device below a cop on the spindle while breaking the spinning frame to a standstill;
• and
• during said forming of the reverse winding, changing at least one of the parameters of twist, draft, and number of revolutions of the cop in such a way that a different yarn strength of the yarn is defined in the reverse winding section of the yarn as compared to the yarn produced during normal spinning of the spinning frame.