Bottle centering device for a capping machine for caps made of compressible material and capping machine for caps made of compressible material provided with such bottle centering device

A bottle centering device for a capping machine for caps made of compressible material, wherein said bottle centering device comprises:

• a support structure associated with a compression box of a capping machine at a cap compression seat, and which defines a through opening for passage of a compressed cap and a cap insertion punch of said capping machine, said support structure being mountable on said compression box so that said through opening has a central axis axially centered on said cap compression seat;
• bottle centering means associated with said support structure and defining an invitation seat which defines a central through opening, is configured for engagement by a mouth of a bottle to be capped and is shaped to guide said mouth towards said through opening axially aligning said mouth with the central axis of said through opening;
• means for moving pieces configured to impart coordinated radial movements on all the pieces such that a radial distance of the shaped heads with respect to the central axis is the same for all the pieces, wherein said means for moving pieces comprise an adjustment ring nut rotationally engaged on the tubular portion of said support structure to rotate about said central axis, on said adjustment ring nut are made a plurality of elongated seats with one ring nut for each piece, each of said elongated seats extending on an arc of circumference eccentric with respect to said central axis, and wherein each elongated seat is engaged by a respective piece, so that an angular rotation of said adjustment ring nut about said central axis corresponds to an eccentric sliding of each elongated seat on the respective piece, said eccentric sliding determining a radial movement of the piece, which is constrained to slide radially along the respective radial sliding seat;
• wherein said bottle centering means comprise a plurality of pieces which are angularly distributed about the central axis of said through opening and each of the plurality of pieces defines with a respective shaped head a portion of said invitation seat, wherein the pieces of said plurality of pieces are radially movable with respect to the central axis to vary radial dimensions of said invitation seat and of said central through opening;
• wherein said support structure defines a radial sliding seat for each of said pieces with respect to the central axis, each radial sliding seat being open on a mouth insertion chamber which is delimited by said support structure coaxially to said through opening and is open on said through opening, and wherein said pieces are inserted in the respective sliding seats so that the respective shaped heads protrude inside said mouth insertion chamber;
• and
• wherein said mouth insertion chamber is delimited by a tubular portion of said support structure coaxial to said through opening.

A capping machine for caps made of compressible material, comprising:

• a compression box;
• one or more compression units, each of the compression units is housed in a cavity made in said compression box and defines a cap compression seat;
• a cap insertion punch for each compression unit;
• a bottle centering device for each compression unit, each bottle centering device being mounted on said compression box with a central axis axially centered on the respective cap compression seat, wherein each bottle centering device comprises:
• a support structure associated with a compression box of a capping machine at a cap compression seat, and which defines a through opening for passage of a compressed cap and a cap insertion punch of said capping machine, said support structure being mountable on said compression box so that said through opening has a central axis axially centered on said cap compression seat;
• bottle centering means associated with said support structure and defining an invitation seat which defines a central through opening, is configured for engagement by a mouth of a bottle to be capped and is shaped to guide said mouth towards said through opening axially aligning said mouth with the central axis of said through opening;
• a common drive device of all of said bottle centering devices, said common drive device being kinematically connected to the means for moving pieces of each of said bottle centering devices;
• wherein said bottle centering means comprise a plurality of pieces which are angularly distributed about the central axis of said through opening and each of the plurality of pieces defines with a respective shaped head a portion of said invitation seat, wherein the pieces of said plurality of pieces are radially movable with respect to the central axis to vary radial dimensions of said invitation seat and of said central through opening;
• and
• wherein said capping machine is a multiple rotary type capping machine, having the compression box of an annular shape axially centered on a rotation axis of said capping machine, and wherein said compression box supports a plurality of compression units angularly distributed around said rotation axis, a respective bottle centering device being associated with each compression unit.

A bottle centering device for a capping machine for caps made of compressible material, wherein said bottle centering device comprises:

• a support structure associated with a compression box of a capping machine at a cap compression seat, and which defines a through opening for passage of a compressed cap and a cap insertion punch of said capping machine, said support structure being mountable on said compression box so that said through opening has a central axis axially centered on said cap compression seat;
• bottle centering means associated with said support structure and defining an invitation seat which defines a central through opening, is configured for engagement by a mouth of a bottle to be capped and is shaped to guide said mouth towards said through opening axially aligning said mouth with the central axis of said through opening;
• wherein said bottle centering means comprise a plurality of pieces which are angularly distributed about the central axis of said through opening and each of the plurality of pieces defines with a respective shaped head a portion of said invitation seat, wherein the pieces of said plurality of pieces are radially movable with respect to the central axis to vary radial dimensions of said invitation seat and of said central through opening;
• and
• wherein the shaped head of each of said pieces comprises an invitation portion converging towards said through opening, said converging invitation portion being defined by a portion of a truncated conical surface.