Rotary cutting and/or sealing mechanisms

A rotary mechanism comprising:

• at least one pair of rotors mounted on spaced, parallel axes of rotation and rotatable on said axes in opposite directions to each other,
• each rotor having a plurality of radially projecting arms,
• radially outer faces on said arms of each rotor directed away from the axis of rotation of said rotor,
• the radially outer faces of said pair of rotors being brought together in juxtaposition by said rotation of the rotors,
• at least one of sealing means and cutting means at said radially outer faces for engaging web material between the juxtaposed outer faces to seal and/or cut said web material,
• bearer means on opposite end regions of said outer faces for contact with each other when said outer faces come together,
• the cutting and/or sealing means being disposed between the bearer means on each face whereby said contact of the bearer means sets a spacing between the cutting and/or sealing means on the respective faces,
• at one end region of the juxtaposed outer faces the bearer means comprising locating elements positioning the faces to constrain relative movement between the bearer means in the direction of the axes of rotation of the pair of rotors, and
• at the opposite end region of said faces the bearer means comprising bearing elements permitting relative movement in said axial direction
• wherein the bearing and locating elements extend forwardly of the cutting and/or sealing means on the respective outer faces in the direction of rotation.