Method for Doffing for a Spinning Machine and a Corresponding Doffer

A method for removing full bobbins from spindles on a ring spinning machine and for setting down empty sleeves on the spindles using a doffer, wherein the doffer has a beam and a rotatable gripping device mounted on the beam, the gripping device having a sleeve gripper and a bobbin gripper, and the doffer arranged next to the ring spinning machine, the method comprising the following sequential steps:

• (a) gripping an empty sleeve with the sleeve gripper;
• (b) raising of the beam vertically;
• (c) extending the gripping device from the beam to a position over a full bobbin on a spindle at the ring spinning machine;
• (d) removing the full bobbin from the spindle with the bobbin gripper, rotating the gripping device, and placing the empty sleeve on the spindle;
• (e) retracting the gripping device toward the beam;
• (f) lowering the beam vertically;
• and
• (g) setting down the full bobbin from the bobbin gripper.

A doffer system configured for arrangement alongside a ring spinning machine to remove full bobbins from spindles on the ring spinning machine and to set down empty sleeves on the spindles, the doffer comprising:

• a doffer beam;
• a gripping device rotatably mounted on the beam;
• the gripping device further comprising a sleeve gripper and a bobbin gripper;
• a drive configured with the doffer beam to raise and lower the doffer beam;
• and
• a drive configured with the gripping device to extend and retract the gripping device relative to the doffer beam.