Bobbin stripping unit

Abstract

A bobbin stripping unit for removing yarn residues from a bobbin, the bobbin being substantially cylindrical with a longitudinal axis. The bobbin stripping unit includes a holding device which holds the bobbin in a substantially vertical or horizontal position with respect to its longitudinal axis, at least one suction nozzle extending over substantially the entire length of the bobbin for sucking in yarn residues, and a casing which can be transferred between a stripping configuration and a release configuration. In the stripping configuration, the casing substantially surrounds the bobbin, at least partially. In the release position, the casing exposes the bobbin for insertion and removal.

1 . A bobbin stripping unit for removing yarn residues from a bobbin, wherein the bobbin is substantially cylindrical with a longitudinal axis, wherein the bobbin stripping unit comprises:
 a holding device which holds the bobbin in a substantially vertical or horizontal position with respect to its longitudinal axis;   at least one suction nozzle extending over substantially the entire length of the bobbin for sucking in yarn residues; and   a casing which can be transferred between a stripping configuration and a release configuration, wherein the casing in the stripping configuration surrounds the bobbin at least partially and in the release position exposes the bobbin for insertion and removal.   
     
     
         2 . The bobbin stripping unit according to  claim 1 , wherein the casing is formed in a plurality of parts that are displaceable towards and away from the bobbin substantially along directions which are oriented substantially perpendicular to the longitudinal axis of the bobbin, which is held by the holding device, for transferring between the stripping configuration and the release configuration. 
     
     
         3 . The bobbin stripping unit according to  claim 1 , wherein transferring the casing into the stripping configuration comprises slipping the casing over the bobbin. 
     
     
         4 . The bobbin stripping unit according to  claim 1 , wherein the casing in the stripping configuration has at least one. 
     
     
         5 . The bobbin stripping unit according to  claim 4 , wherein the at least one opening extends over substantially the entire length of the bobbin. 
     
     
         6 . The bobbin stripping unit according to  claim 1 , wherein the casing is formed in two half shell parts which each cover an angular range of approximately 180°. 
     
     
         7 . The bobbin stripping unit according to  claim 1 , wherein the casing comprises a plurality of parts that are displaceable towards and away from the bobbin substantially along directions which are oriented substantially perpendicular to the longitudinal axis of the bobbin; and
 wherein the at least one suction nozzle is assigned to one of the plurality of parts of the casing.   
     
     
         8 . The bobbin stripping unit according to  claim 1 , wherein the at least one suction nozzle is assigned to a displacement device which is configured to displace the at least one suction nozzle substantially parallel to the longitudinal axis of the bobbin (S) which is held by the holding device. 
     
     
         9 . The bobbin stripping unit according to  claim 1 , wherein the at least one suction nozzle has a narrowing in the flow direction of the suction. 
     
     
         10 . The bobbin stripping unit according to  claim 1 , wherein the holding device is configured to rotate the bobbin about its longitudinal axis. 
     
     
         11 . The bobbin stripping unit according to  claim 1 , wherein the at least one suction nozzle is provided with a rotation device which is configured to rotate the suction nozzle about the bobbin which is held by the holding device, wherein the rotation device rotates around a rotational axis that coincides substantially with the longitudinal axis of the bobbin. 
     
     
         12 . A bobbin stripping arrangement, comprising:
 a plurality of bobbin stripping units, wherein each of the bobbin stripping units comprises:
 a holding device for holding a bobbin in a substantially vertical or horizontal position with respect to a longitudinal axis of the bobbin, 
 a suction nozzle extending over substantially the entire length of the bobbin for sucking in yarn residues, and 
 a casing which can be transferred between a stripping configuration and a release configuration, wherein the casing in the stripping configuration surrounds the bobbin at least partially and in the release position exposes the bobbin for insertion and removal; and 
   a control device configured to operate the plurality of bobbin stripping units in a coordinated manner.   
     
     
         13 . A method for operating a bobbin stripping unit, wherein the bobbin stripping unit comprises a holding device for holding a bobbin in a substantially vertical or horizontal position with respect to a longitudinal axis of the bobbin, at least one suction nozzle extending over substantially the entire length of the bobbin for sucking in yarn residues, and a casing which can be transferred between a stripping configuration and a release configuration, the method comprising the steps:
 providing the casing in the release position;   when the casing is in the release position, transferring a bobbin held by the holding device to a designated working position;   when the bobbin is arranged at the designated working position, transferring the casing to the stripping configuration, in which the casing substantially surrounds the bobbin;   when the casing is in the stripping configuration, operating the at least one suction nozzle to suck in yarn residues located on the bobbin;   upon completing operation of the at least one sucking nozzle, returning the casing to the release position; and   when the casing is returned to the release position, removing the bobbin which is held by the holding device from the working position.   
     
     
         14 . The bobbin stripping unit according to  claim 1 , wherein the casing in the stripping configuration substantially completely surrounds the bobbin. 
     
     
         15 . The bobbin stripping unit according to  claim 1 , wherein the at least one opening is located between at least two adjacent parts of the plurality of parts of the casing. 
     
     
         16 . The bobbin stripping unit according to  claim 1 , wherein the casing is formed in a plurality of parts that are displaceable substantially along directions which are oriented substantially perpendicular to the longitudinal axis of the bobbin for transferring between the stripping configuration and the release configuration; and
 wherein the at least one suction nozzle is assigned to one of the parts of the casing such that transferring the casing into the stripping configuration displaces the at least one suction nozzle to be substantially parallel to the longitudinal axis of the bobbin.   
     
     
         17 . The bobbin stripping arrangement of  claim 12 , further comprising a vacuum device connected to the nozzle of each bobbin stripping unit; and
 wherein the control device is configured to operate the vacuum device to generate a vacuum necessary for sucking in the yarn residue through each nozzle in parallel.