Rotary cutting and/or sealing mechanisms

A rotary cutting mechanism comprising:

• at least one pair of rotors,
• mounting means for said rotors supporting the rotors on axes of rotation that are parallel and spaced apart, the rotors being rotatable on said axes in opposite directions to each other,
• each rotor comprising radially projecting arms having axially outer ends provided with cutting means,
• said cutting means on the respective rotors comprising at least one elongate cutter element having a radially outer cutting edge extending axially of the rotor and at least one elongate anvil element for cooperation with the cutter element,
• means for radial adjustment of at least one of said cutter and anvil elements of the or each pair of cooperating cutter and anvil elements,
• said radial adjustment means comprising an axially elongate wedge member engaged by one of said pair of elements, a generally radially directed face of said wedge member being inclined with respect to the direction of rotation,
• a radially inner face of said radially adjustable cutter or anvil element being engaged by a radially outer face of said wedge element and a radially inner face of the wedge member being supported against radially inward displacement,
• means for adjusting the wedge member in said direction of rotation and for securing it in its position of adjustment, thereby to control the radial setting of the associated cutter or anvil element.

A rotary mechanism comprising a pair of rotors and respective carriers on which said rotors are mounted for counter-rotation about parallel axes lying in a plane,

• each rotor having a plurality of radially outer faces equally angularly spaced about the axis of rotation of said rotor,
• at least one of cutting and sealing means on said outer faces of the rotors to cut and/or seal web material engaged between said outer faces of the pair of rotors,
• supporting means for displaceably supporting one of the carriers and biasing means acting to displace said one carrier for urging said outer faces into engagement,
• means being provided to limit the displacement of said one carrier by said biasing means,
• said biasing means bearing on said one carrier at a location substantially coincident with said plane of the axes of the two rotors, and
• the displacement limiting means comprising at least one stop element also substantially coincident with said plane of the rotor axes.