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US 6,007,315 AGranted
Apparatus for molding a plastic seal inside a closure for closing a container
AssigneeSACMI Cooperative Meccanici Imola S.c.r.l.
InventorPietro Busacchi
Life of this patent
Estimating the term…
Abstract
Apparatus for molding a plastic seal inside a closure for closing a container, having a line for transferring the closures through a closure heating station, a station for dispensing and preforming plastic material in the pasty state, suitable to deposit a dose of material inside a respective closure and preform each dose dispensed inside each closure in an annular configuration, and a final forming station, in which the preformed annular dose is molded so as to form the final seal inside the closure.
Claims13
An apparatus for molding a seal made of plastic material inside a closure for closing a container, comprising:
- a closure heating station;
- a transfer unit for transferring closures through said closure heating station;
- a dispensing station for dispensing plastic material in pasty state, said dispensing station depositing a dose of material inside a respective closure which arrives from said heating station;
- a preforming station comprising at least one preforming device, said preforming device preforming each dose dispensed inside each closure in an annular shape;
- and
- a final forming station comprising at least one forming device;
- each said dose that has been preformed in the annular shape being molded in said forming device so as to form a final seal inside each said closure;
- said at least one forming device compring:
- a punch which is composed of a sleeve, of a cup-shaped portion which is guilded inside said sleeve, and of a bush which is guided outside said sleeve;
- elastic means which act on said bush and said cup-shaped portion and for keeping said cup-shaped portion and said bush in an abutment position whereat edges thereof protrude beyond an edge of said sleeve;
- a flat disk cooperating with said punch and being coaxial and movable with respect to the punch in order to lift a closure which has been transfered to said preforming device by said transfer unit and s se te closure on said punch, so as to insert said preformed seal in a groove formed between protruding edges of said bush and said cup-shaped portion and then perform a final forming of said preformed seal by lifting said bush and said cup-shaped portion with respect to said sleeve in contrast with action of said elastic means.
8 more elements
An apparatus for molding a seal made of plastic material inside a closure for closing a container comprising:
- a closure heating station;
- a transfer unit for transfering closures throught said closure heating station;
- a dispensing station for dispensing plastic material in pasty state, said dispensing station depositing a dose of material inside a respective closure which arrives from said heating station;
- a preforming station comprising at least one preforming device, said preforming device preforming each dose dispensed inside each closure in an annular shape;
- and
- a final forming station comprising at least one forming device;
- each said dose that has been preformed in the annular shape being molded in said forming device so as to form a final seal inside each said closure;
- said transfer unit comprising a conveyor which is composed of:
- two flexible parallel elements which are close in a loop around respective pairs of pulleys;
- a guide for said closures;
- said parallel conveyor elements having a portion thereof that lies horizontally at sides of said guide;
- and
- cross-members for connecting said parallel elements, and for acting as pushers for said closures, said pushers being actuated intermittently with an advancement pitch which is equal to a pitch between said cross-members;
- and
- said heating station, said dispensing station, said preforming station and said final forming station for said seal being arranged at a mutual distance which is equal to the pitch of said cross-members.
12 more elements
An apparatus for molding a seal made of plastic material inside a closure for closing a container, comprising:
- a closure heating station;
- a transfer unit for transferring closures through said closure heating station;
- a dispensing station for dispensing plastic material in pasty state, said dispensing station depositing a dose of material inside a respective closure which arrives from said heating station;
- a preforming station comprising at least one preforming device, said preforming device preforming each dose dispensed inside each closure in an annular shape;
- and
- a final forming station comprising at least one forming device;
- each said dose that has been preformed in the annular shape being molded in said forming device so as to form a final seal inside each said closure;
- said preforming device comprising:
- a circular plate;
- a central duct;
- channels being formed at said plate, said channels extending from said central duct which is connected to the dose dispensing station;
- chambers, to which said central duct leads and formed proximate to an edge of the circular plate;
- openings of said chambers;
- a groove, in which said openings lead, formed in a lower face of said circular plate;
- adjustable pins axially adjustably screwed to said circular plate and positioned for controlling said openings;
- a coaxial flat disk, cooperating with said circular plate, and which is movable with respect thereto in order to raise a closure which has been transferred thereonto by said transfer unit and superimpose the closure on said circular plate so as to close said groove during dispensing of plastic material through said openings and so as to lower said closure after said material has filled said groove.
13 more elements
Dependencies are inferred from the claim text.