Bobbin and especially a bobbin wound with a yarn

A bobbin for receiving a yarn reservoir, comprising:

• a conical winding zone for the yarn, and
• a standing area for the bobbin, the bobbin being formed as a hollow member and provided with at least one retaining element for fixing the yarn end, a lower, cylindrical standing section and a frustro-conical section associated therewith,
• wherein the frustro-conical section is constructed in one piece with the winding zone such that the conical winding zone passes through a base circle having a smaller radius of the frustro-conical section and penetrates at least partly into an interior portion of the frustro-conical section,
• wherein the cylindrical standing section is axially displaceable relative to the frustro-conical section such that on contact of the cylindrical standing section with the frustro-conical section, the retaining element for fixing the yarn end is formed, and
• wherein an inside diameter (d1) of the cylindrical standing section is greater than an inside diameter (d2) of a base circle having the larger radius of the frustro-conical section, a radially inwardly directed ring element being provided on a foot side of the frustro-conical section and the cylindrical standing section being provided with a guide element at an end thereof pointing towards the frustro-conical section which retains the ring element axially displaceably in a force- and/or form-locking fashion.