Sawtooth wire for rollers of spinning preparation machines

A sawtooth wire adapted to be applied in a coil-like manner to a spinning room preparation machine roll along an outer periphery of the spinning room preparation machine roll and approximately transversely with respect to a rotational axis of the spinning room preparation machine roll, comprising:

• a tooth base having a bearing edge, which extends along a longitudinal extent of the sawtooth wire, the tooth base having a tooth side remote from and opposite to the bearing edge;
• and
• a row of teeth located on the tooth side of the tooth base, wherein when the sawtooth wire is stretched out:
• the row of teeth extends along the longitudinal extent of the sawtooth wire;
• teeth of the row of teeth are arranged one after another in a row along the longitudinal extent of the sawtooth wire so that they project from the tooth side perpendicularly to the longitudinal extent of the sawtooth wire;
• and
• each tooth includes:
• a tooth tip which points along the longitudinal extent of the sawtooth wire in a same direction as the tooth tips of the other teeth of the row of teeth and lies parallel to the tooth side or encloses an acute angle with the tooth side;
• a tooth back behind the tooth tip;
• and
• a tooth front including first, second, third and fourth segments, wherein starting from the tooth tip of the tooth:
• the first segment extends at an acute angle towards the tooth side and towards the associated tooth back of the tooth, and merges into the second segment;
• the second segment is concave and adjoins an end of the first segment remote from the tooth tip, wherein an end of the second segment remote from the first segment points at an acute angle with respect to the tooth side towards the tooth side and away from the associated tooth back, and merges into the third segment;
• the third segment adjoins the end of the second segment remote from the first segment, wherein the third segment extends towards the tooth side and away from the associated tooth back and merges into the fourth segment;
• and
• the fourth segment is concave and adjoins an end of the third segment remote from the second segment, wherein an end of the fourth segment remote from the third segment points in the direction of the longitudinal extent of the sawtooth wire and away from the associated tooth back, and wherein the end of the fourth segment remote from the third segment borders upon the tooth back of the subsequent tooth in the row of teeth;
• wherein the second segment has a turning point at which a tangent applied to the second segment runs perpendicularly to the tooth side, a length of the tangent from the turning point to the tooth side is greater than or equal to half of a spacing between the associated tooth tip and the tooth side, and a ratio between the length of the tangent and the spacing is 4:5.