Tube cutting

A knife holder (402) for a tube cutting unit (400) adapted to receiving a rotating tube (2) fed out from a tube manufacturing device (1) in a feed direction (316) which is parallel with the longitudinal direction of the tube (2), which rotation takes place about an axis (310) in the longitudinal direction of the tube (2), such that:

• the knife holder (402) is so disposed that in the longitudinal direction of the tube (2) it follows the rotating tube (2) and that in a cutting direction (458) it brings a knife element (404) into contact with the tube (2) and thereby creates a cut in the rotating tube (2) at right angles to the longitudinal direction of the tube (2),
• the knife holder (402) is provided with at least a first bearing element (414) and a second bearing element (415) configured to engage in respective brackets (416, 417) in the tube cutting unit (400),
• wherein the bearing elements (414, 415) are so disposed relative to one another that the perpendicular direction (464) to a plane (462), which plane passes through midpoints (455, 457) on the respective bearing elements contact surface with the knife holder (402) and runs in the cutting direction through the bearing elements (414, 415), and the longitudinal direction of the tube (2) deviate from being parallel.