IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0304686
(2007-06-08)
|
등록번호 |
US-8202076
(2012-06-19)
|
우선권정보 |
IT-MO2006A0185 (2006-06-14) |
국제출원번호 |
PCT/EP2007/055664
(2007-06-08)
|
§371/§102 date |
20081212
(20081212)
|
국제공개번호 |
WO2007/144312
(2007-12-21)
|
발명자
/ 주소 |
- Parrinello, Fiorenzo
- Zuffa, Zeno
|
출원인 / 주소 |
- Sacmi Cooperativa Meccanici Imola Societa' Cooperativa
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
9 |
초록
▼
An apparatus comprises a punch arrangement and a die arrangement that are opposite one another and closable for defining a forming chamber in which an object can be compression-molded from a dose of plastics, a punch included in the punch arrangement and two parts that are mutually movable for formi
An apparatus comprises a punch arrangement and a die arrangement that are opposite one another and closable for defining a forming chamber in which an object can be compression-molded from a dose of plastics, a punch included in the punch arrangement and two parts that are mutually movable for forming a portion of the object provided with undercuts. The punch arrangement comprises an annular forming element for forming an edge zone of the object, the annular forming element and the punch being mutually movable while the dose fills the forming chamber.
대표청구항
▼
1. Apparatus comprising a punch arrangement and a die arrangement having a cavity, said punch arrangement and said die arrangement being opposite one another for compression moulding a preform from a dose of plastics, a punch being included in said punch arrangement, said apparatus further comprisin
1. Apparatus comprising a punch arrangement and a die arrangement having a cavity, said punch arrangement and said die arrangement being opposite one another for compression moulding a preform from a dose of plastics, a punch being included in said punch arrangement, said apparatus further comprising two mutually movable parts each having a forming surface for forming undercuts on a neck portion of said preform, wherein said punch arrangement further comprises an annular forming element distinct from said mutually movable parts, and from said punch, said annular forming element having an annular forming surface for being contacted by the plastics and thereby forming an annular edge zone of said preform, said apparatus further comprising a retaining sleeve distinct from said annular forming element, said retaining sleeve having a conical internal retaining surface for engaging with a coupling surface of the movable parts in order to keep the movable parts in contact with one another in a contact position thereof, said punch arrangement and said die arrangement being mutually movable to define a closed forming chamber delimited by said die arrangement, said punch, said mutually movable parts and said annular forming element, wherein said annular forming element and said punch are movable relative to one another after the forming chamber has been closed in order to progressively reduce volume of said forming chamber until said preform is obtained, and wherein each movable part has a guiding surface which is slidable in contact with an external guiding surface of said annular forming element when the movable parts are in the contact position and move relative to the annular forming element in order to close or open the forming chamber. 2. Apparatus according to claim 1, wherein said annular forming element surrounds said punch. 3. Apparatus according to claim 1, wherein said annular forming element is coaxial to said punch. 4. Apparatus according to claim 1, wherein said annular forming element has a tubular shape open at its ends. 5. Apparatus according to claim 1, wherein said punch comprises a region bounded by a forming surface suitable for forming an internal surface of said preform, said region protruding from said annular forming element towards said die arrangement. 6. Apparatus according to claim 1, wherein said punch comprises a shoulder on which a further shoulder of said annular forming element abuts in an end-stroke position of said annular forming element. 7. Apparatus according to claim 1, wherein said annular forming element is movable with respect to said punch owing to a force exerted by said die arrangement. 8. Apparatus according to claim 1, and further comprising a first elastic device acting on said annular forming element for pushing said annular forming element towards said die arrangement. 9. Apparatus according to claim 8, wherein said first elastic device comprises a first chamber in which a first pressurised fluid is contained, said first pressurised fluid acting as a gas spring. 10. Apparatus according to claim 8, and further comprising a second elastic device acting on said annular forming element through an interposed component, so as to push said annular forming element towards said die arrangement. 11. Apparatus according to claim 10, wherein said first elastic device comprises a first chamber in which a first pressurised fluid is contained, said first pressurised fluid acting as a gas spring, said second elastic device comprising a second chamber containing a second pressurised fluid, said second pressurised fluid acting as a gas spring. 12. Apparatus according to claim 11, wherein said second chamber communicates with said first chamber. 13. Apparatus according to claim 11, and further comprising a third elastic device acting on the retaining sleeve suitable for maintaining said movable parts in contact with one another, so as to push said retaining sleeve towards said die arrangement. 14. Apparatus according to claim 13, wherein said third elastic device comprises a third chamber containing a third fluid, said third fluid being at a lower pressure than said first pressurised fluid, said third fluid acting as a gas spring. 15. Apparatus according to claim 1, and comprising a sensing device for detecting position of an actuating device suitable for moving said die arrangement with respect to said punch. 16. Apparatus according to claim 15, and comprising a retaining sleeve suitable for maintaining said movable parts in contact with one another, said sensing device being arranged so as to detect position of said retaining sleeve, said retaining sleeve being movable by said actuating device at least for a portion of the stroke thereof. 17. Apparatus according to claim 16, wherein said sensing device comprises an inductive sensor suitable for detecting the position of a reference element fixed to said retaining sleeve. 18. Apparatus according to claim 1, wherein said annular forming element is interposed between said punch and said movable parts. 19. Apparatus according to claim 18, wherein a first interface zone is defined between said annular forming element and said movable parts and a second interface zone is defined between said annular forming element and said punch, said first interface zone and said second interface zone being arranged for evacuating air from said forming chamber. 20. Apparatus according to claim 19, wherein said first interface zone and said second interface zone communicate with a source of pressurised gas, to detach said preform from said punch. 21. Apparatus according to claim 1, wherein said movable parts are supported by said punch arrangement. 22. Apparatus according to claim 1, wherein said movable parts are supported by said die arrangement. 23. Apparatus according to claim 1, wherein said die arrangement comprises a die provided with said cavity in which an external portion of said preform can be shaped. 24. Apparatus according to claim 23, wherein said movable parts are supported by said die arrangement, said apparatus further comprising a pressing element for maintaining said movable parts in contact with said die when said punch arrangement is distanced from said die arrangement. 25. Apparatus according to claim 1, wherein said punch arrangement and said die arrangement are included in a moulding unit, said apparatus comprising a plurality of moulding units arranged in a peripheral region of a rotatable carousel. 26. Apparatus according to claim 1, wherein said punch is arranged in a fixed position. 27. Apparatus according to claim 1, and further comprising an actuator for moving said die arrangement towards said punch arrangement along a stroke in order to close the forming chamber. 28. Apparatus according to claim 27, wherein the punch arrangement comprises a chamber containing a pressurized fluid acting on the retaining sleeve, the die arrangement having a surface for contacting a further coupling surface of the movable parts at a point of said stroke, so that the die arrangement displaces the movable parts against action of said pressurized fluid. 29. Apparatus according to claim 28, wherein the punch arrangement comprises a further chamber containing a further pressurized fluid acting on the annular forming element, the movable parts having a further surface for abutting on an interacting surface of the annular forming element at a subsequent point of said stroke, so that the movable parts displace the annular forming element against action of said further pressurized fluid.
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