Abstract: Packaging apparatus for packaging units in flexible sheet material with the units spaced longitudinally in a tube formed of the material and with the tube sealed together between successive units. The apparatus includes a rotary sealing wheel carrying a series of sealing assemblies for sealing the tube. The sealing assemblies are uncoupled from the wheel and held at a hold position for again being released in timed relation to movement of the tube for sealing the tube between successive units. In accordance with this invention an improved center guide is provided for the sealing units so as to more precisely maintain the sealing units substantially perpendicular to the plane of the wheel and to apply a braking force to each of the sealing units so as to resist movement of the sealing units relative to the wheel.