Method for Doffing for a Spinning Machine and a Corresponding Doffer

Abstract

A method for removing full bobbins from spindles of a ring spinning machine and for setting down empty sleeves on the spindles using a doffer is disclosed. The doffer has a beam and a rotatable gripping device that is mounted on the beam and has a sleeve gripper and a bobbin gripper, wherein the doffer is arranged next to the ring spinning machine. The beam is raised vertically and the gripping device is extended from the beam over the full bobbin. The invention also relates to a doffer having the corresponding drives.

1 - 15 : (canceled) 
     
     
         16 . 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.   
     
     
         17 . The method according to  claim 16 , wherein step (c) comprises a horizontal pivoting of the gripping device away from the beam, and further comprising a rotational operation of the gripping device carried out between the steps (a)-(b) and between the steps (f)-(g). 
     
     
         18 . The method according to  claim 16 , wherein step (c) comprises a pivoting of the gripping device obliquely upward with an offset. 
     
     
         19 . The method according to  claim 16 , wherein step (d) comprises retraction of the gripping device toward the beam before the rotational operation of the gripping device, wherein the gripping device is again extended over the spindle after the rotational operation, or the rotational operation of the gripping device of step (d) takes place with the gripping device located over the spindle. 
     
     
         20 . The method according to  claim 16 , wherein the bobbin gripper has a bobbin receptacle that is open at the bottom and is inverted over the bobbin for gripping the bobbin from above, and the sleeve gripper has a sleeve receptacle that is open toward the bottom and is inverted over the sleeve for gripping the sleeve from above. 
     
     
         21 . The method according to  claim 16 , wherein the sleeve gripper and the bobbin gripper are operated pneumatically. 
     
     
         22 . The method according to  claim 16 , wherein adjacent ones of the gripping devices on the beam are rotated with a time lag between one another. 
     
     
         23 . The method according to  claim 16 , wherein the gripping device has indicators that provide a rotational position indication of the gripping device through a base body of the gripping device. 
     
     
         24 . 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.   
     
     
         25 . The doffer system according to  claim 24 , wherein the drive configured with the gripping device comprises one of a joint for horizontal pivoting of the gripping device away from the beam, or a joint for obliquely upward pivoting of the gripping device with an offset. 
     
     
         26 . The doffer system according to  claim 24 , wherein the bobbin gripper comprises a bobbin receptacle that is open at the bottom and is inverted over the bobbin for gripping the bobbin from above, and the sleeve gripper comprises a sleeve receptacle that is open toward the bottom and is inverted over the sleeve for gripping the sleeve from above. 
     
     
         27 . The doffer system according to  claim 26 , wherein the bobbin gripper and the sleeve gripper are cylindrical or conical. 
     
     
         28 . The doffer system according to  claim 26 , wherein the bobbin gripper and the sleeve gripper comprise a same diameter. 
     
     
         29 . The doffer system according to  claim 24 , wherein an axis of the bobbin gripper and an axis of the sleeve gripper are at an angle to one another between 4° and 20°. 
     
     
         30 . The doffer system according to  claim 24 , wherein an angle between an axis of rotation of the gripping device and an axis of the bobbin gripper is equal to an angle between the axis of rotation of the gripping device and an axis of the sleeve gripper.