Method and apparatus for severing a sliver during coiler can replacement in a drawing frame

In an apparatus for processing and depositing sliver, including

• a drawing frame having
• consecutive pairs of drafting rolls through which the sliver runs;
• a first drive means for rotating the drafting rolls of different pairs at different speeds to impart a draft to the running sliver;
• a coiler head supported adjacent said drawing frame for receiving sliver discharged by said drawing frame;
• said coiler head having a sliver outlet;
• a second drive means for operating said coiler head;
• and
• a coiler can replacing device for moving a first, sliver-filled coiler can away from under the coiler head and moving a second, replacement coiler can underneath the coiler head;
• a third drive means for operating said coiler can replacing device;
• the improvement comprising
• (a) a fill level sensor for detecting a fill level in said first coiler can;
• and
• (b) a control and regulating device connected to said fill level sensor, said first, second and third drive means for causing said draft to be increased upon receiving from said fill level sensor a signal representing a desired fill level, whereby a location of reduced thickness in the running sliver is provided and for causing operation of said coiler can replacing device to move said first coiler can away from under said coiler head, whereby the sliver is ruptured at said location of reduced thickness.