Revolving plate for a sliver depositing device

Abstract

A revolving plate for a sliver depositing device of a sliver-producing or sliver-processing spinning preparation machine is suggested that is designed for depositing sliver supplied in a running manner into a container ( 10 ), which revolving plate ( 1 ) has a press surface ( 7 ) arranged vertically to its axis of rotation ( 11 ) for pressing the deposited sliver into the container ( 10 ) and has a sliver passage ( 2 ) with a helical spatial curve , whereas the entrance opening ( 5 ) of the sliver passage ( 2 ) is arranged in such a manner that the supplied sliver enters into the sliver passage ( 2 ) parallel to the axis of rotation ( 11 ) of the revolving plate ( 1 ) and without bends, and whereas the exit opening ( 6 ) of the sliver passage ( 2 ) is in the plane of the press surface ( 7 ). The revolving plate in accordance with the invention is distinguished in that the sliver passage ( 2 ) has such a shape at least on a predominant part of its length that at a given ratio between the supply speed of the sliver and the speed of the revolving plate ( 1 ) substantially no force acting on the sliver to be deposited and tangential to the axis of rotation ( 11 ) of the revolving plate ( 1 ) occurs along the sliver passage ( 2 ) in order to reduce in this manner the friction of the sliver on the inner wall of the sliver passage in order to prevent the accumulation and collecting of particles on the inner wall of the sliver passage that loosened out of the sliver. A corresponding method for depositing a sliver supplied in a running manner into a container is also suggested.

1 . A revolving plate for a sliver depositing device of a sliver-producing or sliver-processing spinning preparation machine that is designed for depositing sliver supplied in a running manner into a container ( 10 ), which revolving plate ( 1 ) has a press surface ( 7 ) arranged vertically to its axis of rotation ( 11 ) for pressing the deposited sliver into the container ( 10 ) and has a sliver passage ( 2 ) with a helical spatial curve, whereas the entrance opening ( 5 ) of the sliver passage ( 2 ) is arranged in such a manner that the supplied sliver enters into the sliver passage ( 2 ) parallel to the axis of rotation ( 11 ) of the revolving plate ( 1 ) and without bends, and whereas the exit opening ( 6 ) of the sliver passage ( 2 ) is in the plane of the press surface ( 7 ), characterized in that the sliver passage ( 2 ) has such a shape at least on a predominant part of its length that at a given ratio between the supply speed of the sliver and the speed of the revolving plate ( 1 ) substantially no force acting on the sliver to be deposited and tangential to the axis of rotation ( 11 ) of the revolving plate ( 1 ) occurs along the sliver passage ( 2 ) in order to reduce in this manner the friction of the sliver on the inner wall of the sliver passage in order to prevent the accumulation and collecting of particles on the inner wall of the sliver passage that loosened out of the sliver.  
   
   
       2 . The revolving plate according to  claim 1 , characterized in that the center line ( 14 ) of the sliver passage ( 2 ) conforms at least over a predominant part of its length to an ideal line ( 12 ) that runs in such a manner over the entire length of the sliver passage ( 2 ) that at a given ratio between the supply speed of the sliver and the speed of the revolving plate ( 1 ) the tangential speed V BK-TM tang  of each point P of ideal line  12 , which speed is produced by the rotation of the revolving plate ( 1 ) relative to the textile machine, is opposingly equally as great as tangential component V FB-BK tang  of the relative speed of the sliver relative to the sliver passage ( 2 ) at the particular point P of the ideal line ( 12 ), which tangential component is produced by the transport of the sliver in the sliver passage ( 2 ).  
   
   
       3 . The revolving plate according to  claim 1  or  2 , characterized in that the sliver passage ( 2 ) is designed in such a manner that the actual movement line of the sliver conforms at least over a predominant part of its length to an ideal line ( 12 ) that runs in such a manner over the entire length of the sliver passage ( 2 ) that at a given ratio between the supply speed of the sliver and the speed of the revolving plate ( 1 ) the tangential speed V BK-TM tang  of each point P of ideal line  12 , which speed is produced by the rotation of the revolving plate ( 1 ) relative to the textile machine, is opposingly equally as great as tangential component V FB-BK tang  of the relative speed of the sliver relative to the sliver passage ( 2 ) at the particular point P of the ideal line ( 12 ), which tangential component is produced by the transport of the sliver in the sliver passage ( 2 ).  
   
   
       4 . The revolving plate to according to one of the previous claims, characterized in that the center line ( 14 ) of the sliver passage is composed of directly successive curve sections (B 1 , B 2 , B 3 , B 4 , B 5 ) in space, and that each curve section (B 1 , B 2 , B 3 , B 4 , B 5 ) consists of an elementary geometric shape, in particular of a helical line section, a circular arc (B 1 , B 2 , B 3 , B 4 , B 5 ), an elliptical arc or a straight-line section.  
   
   
       5 . The revolving plate according to the previous claim, characterized in that the curve section bordering on the entrance opening ( 5 ) is a straight-line section.  
   
   
       6 . The revolving plate according to  claim 4  or  5 , characterized in that the curve sections (B 1 , B 2 , B 3 , B 4 , B 5 ) consists of level geometric shapes.  
   
   
       7 . The revolving plate according to one of  claims 4  to  6 , characterized in that the curve sections (B 1 , B 2 , B 3 , B 4 , B 5 ) merge into each other without bends at the transitional areas.  
   
   
       8 . The revolving plate according to one of  claims 4  to  7 , characterized in that the center line ( 14 ) has three to twelve directly successive curve sections (B 1 , B 2 , B 3 , B 4 , B 5 ) that are circular arcs (B 1 , B 2 , B 3 , B 4 , B 5 ) and that adjacent circular arcs (B 1 , B 2 , B 3 , B 4 , B 5 ) have different radii (R 1 , R 2 , R 3 , R 4 , R 5 ) and/or are located in different planes (E 1 , E 2 , E 3 , E 4 , E 5 ).  
   
   
       9 . The revolving plate according to  claim 8 , characterized in that the center line has four to eight directly successive curve sections (B 1 , B 2 , B 3 , B 4 , B 5 ) that are circular arcs (B 1 , B 2 , B 3 , B 4 , B 5 ) and that adjacent circular arcs (B 1 , B 2 , B 3 , B 4 , B 5 ) have different radii (R 1 , R 2 , R 3 , R 4 , R 5 ) and/or are located in different planes (E 1 , E 2 , E 3 , E 4 , E 5 ).  
   
   
       10 . The revolving plate according to one of the previous claims, characterized in that the tangents ML on the center line ( 14 ) have an outwardly facing radial component (ML rad ) in the top view on the upstream opening section ( 6   a ) of the exit opening ( 6 ) relative to the axis of rotation ( 11 ) of the revolving plate ( 1 ).  
   
   
       11 . The revolving plate according to one of the previous claims, characterized in that all tangents (ML) of the section of the center line ( 14 ), which section extends in a top view over the opening area of the exit opening ( 6 ), form an angle (α 1 , α 2 ) of less than 45° and preferably less than 30° with the press surface ( 7 ).  
   
   
       12 . The revolving plate according to  claim 11 , characterized in that the opening area of the exit opening ( 6 ) in the top view is larger than the remaining, closed surface of the sliver passage ( 2 ).  
   
   
       13 . The revolving plate according to  claim 12 , characterized in that the opening area of the exit opening ( 6 ), viewed from the top, is approximately twice as large or larger than the remaining surface of the sliver passage, also viewed from the top.  
   
   
       14 . The revolving plate according to one of the previous claims, characterized in that the center line ( 14 ) has a monotonically, preferably a strictly monotonically falling gradient, relative to a normal plane of the axis of rotation ( 11 ) of the revolving plate ( 1 ) from the entrance opening ( 5 ) to the exit opening ( 6 ).  
   
   
       15 . The revolving plate according to one of the previous claims, characterized in that the center line ( 14 ) has a monotonically rising, preferably a strictly monotonically rising interval to the axis of rotation ( 11 ) from the entrance opening ( 5 ) or following a section running along the axis of rotation ( 11 ) of the revolving plate ( 1 ) to the exit opening ( 6 ).  
   
   
       16 . The revolving plate according to one of the previous claims, characterized in that the sliver passage ( 2 ) has a circular or oval cross section.  
   
   
       17 . The revolving plate according to one of the previous claims, characterized in that the sliver passage ( 2 ) has a uniform cross section in its longitudinal course.  
   
   
       18 . A revolving plate for a sliver depositing device of a sliver-producing or sliver-processing spinning preparation machine that is designed for depositing sliver supplied in a running manner into a container ( 10 ), which revolving plate ( 1 ) has a press surface ( 7 ) arranged vertically to its axis of rotation ( 11 ) for pressing the deposited sliver into the container ( 10 ) and has a sliver passage ( 2 ) with a helical spatial curve, whereas the entrance opening ( 5 ) of the sliver passage ( 2 ) is arranged in such a manner that the supplied sliver enters into the sliver passage ( 2 ) parallel to the axis of rotation (  11 ) of the revolving plate ( 1 ) and without bends, and whereas the exit opening ( 6 ) of the sliver passage ( 2 ) is in the plane of the press surface ( 7 ), characterized in that the opening area of the exit opening ( 6 ) viewed from the bottom is larger than the closed surface of the sliver passage ( 2 ) visible from the bottom.  
   
   
       19 . A revolving plate for a sliver depositing device of a sliver-producing or sliver-processing spinning preparation machine that is designed for depositing sliver supplied in a running manner into a container ( 10 ), which revolving plate ( 1 ) has a press surface ( 7 ) arranged vertically to its axis of rotation ( 11 ) for pressing the deposited sliver into the container ( 10 ) and has a sliver passage ( 2 ) with a helical spatial curve, whereas the entrance opening ( 5 ) of the sliver passage ( 2 ) is arranged in such a manner that the supplied sliver enters into the sliver passage ( 2 ) parallel to the axis of rotation ( 11 ) of the revolving plate ( 1 ) and without bends, and whereas the exit opening ( 6 ) of the sliver passage ( 2 ) is in the plane of the press surface ( 7 ), characterized in that the opening angle (α) of the exit opening ( 6 ), measured from the axis of rotation ( 11 ), is greater than 45°, preferably greater than 60°.  
   
   
       20 . The revolving plate according to one of the previous claims, characterized in that the sliver passage ( 2 ) is designed in one part or consists of several successive partial sections connected to each other.  
   
   
       21 . A method for depositing a sliver supplied in a running fashion into a container in which the sliver is guided through a sliver passage ( 2 ) that is rotated as part of a revolving plate ( 1 ) about an axis of rotation ( 11 ), which supplied sliver is introduced without bends into the sliver passage ( 2 ) through an entrance opening ( 5 ) parallel to the axis of rotation ( 11 ) of the revolving plate ( 1 ), is deflected in the sliver passage ( 2 ) and is conducted out to an exit opening ( 6 ) of the sliver passage ( 2 ) arranged in the plane of a press surface ( 7 ) of the revolving plate ( 1 ), that the exiting sliver is drawn out of the sliver passage with the generation of a longitudinal tension in the sliver, which longitudinal attention is generated in that the sliver is pressed by the press surface ( 7 ) on sliver which has already been deposited and is drawn out of the sliver passage ( 2 ) by the contact with the deposited sliver, characterized in that the deflection of the sliver in the sliver passage ( 2 ) takes place in such a manner that substantially no forces tangential to the axis of rotation ( 11 ) of the revolving plate ( 1 ) are exerted on the sliver and as a result the friction forces acting in a sliver passage ( 2 ) on the sliver are reduced, and that the longitudinal tension is selected in such a manner that the remaining friction forces are just barely overcome.  
   
   
       22 . The method according to  claim 21 , characterized in that the longitudinal tension is selected by adjusting the press force acting on the sliver exiting from the exit opening ( 6 ) and/or adjusting the relative speed of the sliver exiting from the exit opening ( 6 ) to the container.  
   
   
       23 . The method according to  claim 22  or  23 , characterized in that the longitudinal tension is selected in such a manner that the spinning start draft of the sliver produced by the longitudinal tension is less than 1.02 and preferably less than 1.01.