Coilbox and method for the operation thereof

A coilbox (100), comprising:

• a winding station (110) for winding a metal strip to form a coil (20),
• wherein the winding station is formed by a plurality of rollers, including
• a first roller (111), a second roller (112),
• and at least one additional roller (116) that are rotatably mounted
• on a common frame (114);
• a rotary drive (125) for pivoting the frame (114) with the first roller (111) and the second roller (112) through an angle of rotation (α) about a point of rotation (D) in a region of the first roller (111) between
• a winding position, in which the metal strip is wound to form the coil (20), through a plurality of transition positions (P1, P2, P3), into
• a transfer position (P4) for transferring the coil (20) to an unwinding station (120);
• the unwinding station (120) in which, the metal strip can be unwound from the coil (20), including at least
• a third roller (123) and
• a fourth roller (124);
• wherein the unwinding station (120) is arranged downstream of the winding station (110) in a direction of material flow (R), and
• wherein the second roller (112) is arranged downstream of the first roller (111) and the fourth roller (124) is arranged downstream of the third roller (123) in the direction of material flow (R), and
• wherein axes of rotation of all rollers are aligned parallel to one another, and wherein the axis of rotation of the additional roller (116)
• is positioned on the frame (114) in such a manner that
• a radial distance (xz) from the point of rotation (D) of the frame (114) to the axis of rotation of the additional roller (116)
• is greater than a radial distance (x2) from the point of rotation of the frame to the axis of rotation of the second roller;
• and
• the radial distance (xz) from the the axis of rotation (D) of the frame (114) to the axis of rotation of the additional roller (116)
• plus a radius of the additional roller (116)
• is smaller than a minimum radial distance (x3) from the axis of rotation of the third roller (123) to the point of rotation (D) of the frame (114), minus at least a radius of the third roller, and
• an uppermost point of the additional roller in a first transition position (P1) of the plurality of transition positions (P1, P2, P3), in which uppermost points of the first roller and the second roller form a horizontal roller table plane (E1), is arranged at a predetermined distance (w) below the horizontal roller table plane (E1).