IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0121940
(2002-04-12)
|
우선권정보 |
DE-0018486 (2001-04-12) |
발명자
/ 주소 |
- Kö
- hler, Ingo
- Jaeger, Ansgar
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
2 |
초록
▼
An injection assembly for an injection molding machine, with a continuously operating plasticizing unit, includes a piston-type injection unit and an arrangement for intermediate storage and discharge of melt. Several melt reservoirs with melt inlet openings are provided between the plasticizing uni
An injection assembly for an injection molding machine, with a continuously operating plasticizing unit, includes a piston-type injection unit and an arrangement for intermediate storage and discharge of melt. Several melt reservoirs with melt inlet openings are provided between the plasticizing unit and the piston-type injection unit. Melt lines that connect the melt reservoirs with each other and with the plasticizing unit extend to the melt inlet openings. The melt reservoirs include actuatable work pistons for discharging the melt, wherein the work pistons can open and close the melt inlet openings in the melt reservoirs to divert the melt flow. The disclosed injection unit increases the total volume of bufferable melt and allows individual and separate adjustment of the reservoir volumes and the discharge velocity of the individual melt reservoirs. In addition, switching valves can be eliminated since the melt flow is switched by the work pistons.
대표청구항
▼
1. An injection assembly for use in an injection molding machine having a continuously operating plasticizing unit, comprising:a piston injection unit receiving melt from the plasticizing unit;a plurality of melt reservoirs for storing melt, said melt reservoirs disposed between the plasticizing uni
1. An injection assembly for use in an injection molding machine having a continuously operating plasticizing unit, comprising:a piston injection unit receiving melt from the plasticizing unit;a plurality of melt reservoirs for storing melt, said melt reservoirs disposed between the plasticizing unit and the piston injection unit and having melt inlet openings; anda manifold connected to the melt inlet openings and connecting the plurality of melt reservoirs with one another and with the plasticizing unit,each melt reservoir having an actuatable work piston for discharging the melt, wherein the work pistons can be moved into a closure position to close the melt inlet openings in the melt reservoirs for the purpose of diverting a flow of the melt. 2. The injection assembly of claim 1, wherein the manifold is constructed without incorporation of valves. 3. The injection assembly of claim 1, wherein the melt reservoirs are disposed on opposite ends of the manifold. 4. An injection assembly for use in an injection molding machine having a continuously operating plasticizing unit, comprising:a piston injection unit receiving melt from the plasticizing unit and having a cylinder, which defines an interior space, and an injection piston moveably received in the cylinder end dividing the interior space in an anterior chamber, representing an injection space, and a posterior chamber, representing a melt reservoir, said cylinder including a melt inlet opening so located at a side of the cylinder that the anterior chamber is filled with melt, when the injection piston is disposed behind the inlet opening, and that the posterior chamber is filled with melt, when the injection piston is located in front of the inlet opening, wherein the injection piston has at least one overflow valve constructed to open during a return motion of the piston so as to allow a flow of melt from the melt reservoir into the injection space, and to close during a forward motion or the injection piston. 5. The injection assembly of claim 4, wherein the at least one overflow valve is implemented as a ball valve. 6. The injection assembly of claim 4, wherein the at least one overflow valve is implemented as an annular valve extending across an entire periphery of the injection piston. 7. The injection assembly of claim 4, wherein the injection piston includes a compensating element configured such that at intermediate disposition of the injection piston in the interior space, the injection space has a volume which is substantially identical to a volume of the melt reservoir. 8. The injection assembly of claim 7, wherein the compensating element has a conical shape and is disposed on a front face of the injection piston. 9. An injection assembly for use in an injection molding machine having a continuously operating plasticizing unit, comprising:a piston injection unit receiving melt from the plasticizing unit and having a cylinder, which defines an interior space and an injection piston moveably received in the cylinder and dividing the interior space in an anterior chamber, representing an injection space, and a posterior chamber, representing a melt reservoir, said cylinder including a melt inlet opening so located at a side of the cylinder that the anterior chamber is filled with melt, when the injection piston is disposed behind the inlet opening, and that the posterior chamber is filled with melt, when the injection piston is located in front of the inlet opening; andpassageway means including at least one overflow channel to connect the melt reservoir with the injection space so as to allow a flow of melt from the melt reservoir into the injection space during a return motion of the injection piston. 10. The injection assembly of claim 9, wherein the passageway means includes front openings located in the injection space substantially proximate to a forward end face of the cylinder. 11. The injection assembly of claim 9, wherein the passageway means includes rear openings located in the melt reservoir substantially proximate to a rearward end face of the cylinder. 12. The injection assembly of claim 9, and further comprising check valves disposed in the passageway means. 13. The injection assembly of claim 9, wherein the passageway means is disposed within the cylinder of the piston injection unit. 14. The injection assembly of claim 9, wherein the passageway means is disposed outside the cylinder of the piston injection unit. 15. The injection assembly of claim 9, wherein the passageway means is implemented as a tube or pipe connection between the melt reservoir and the injection space. 16. The injection assembly of claim 9, wherein the injection piston includes a compensating element configured such that at intermediate disposition of the injection piston in the interior space, the injection space has a volume which is substantially identical to a volume of the melt reservoir. 17. The injection assembly of claim 15, wherein the compensating element has a conical shape and is disposed on a front face of the injection piston.
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