Tube holder for a tube filling machine

Tube holder for a tube filling machine, comprising a housing which has an upwardly opening tube receptacle into which one end region of a tube can be inserted, wherein first clamping elements are arranged in the tube receptacle, which can each be brought to abut with a first clamping surface to an outer wall of the tube and by which under the action of at least one first spring element a first clamping force acting radially from outside onto the inserted tube can be applied, wherein the first clamping elements are arranged and distributed over the circumference of the tube receptacle and form a first group of the first clamping elements, wherein below the first group of the first clamping elements second clamping elements are arranged at an axial distance, which are arranged and distributed over the circumference of the tube receptacle and form a second group of the second clamping elements and which can each be brought to abut with a second clamping surface to the outer wall of the tube and by which under the action of the at least one first spring element and/or at least one second spring element a second clamping force acting radially from outside onto the inserted tube can be applied, wherein the first and second clamping elements are each pivotably mounted in a pivot bearing about a horizontally extending pivot axis, wherein the first clamping surface of a plurality of the first clamping elements and/or a second clamping surface of a plurality of the second clamping elements at least in sections has a convex contour, curved about a horizontal axis, in the direction of a longitudinal central axis of the tube receptacle.