Injection device provided with flow path switching block

Abstract

[Problem] To provide an injection apparatus including a flow path switching mechanism that is simple in construction and low in cost. [Solution] An injection apparatus () includes a plasticization device () for melting resin, a first and second plunger injection devices () for measuring an amount of resin and injecting the resin, an injecting portion (), and a flow path switching block () that connects the plasticization device, the first and second plunger injection devices and the injecting portion together. A first to fourth connecting flow paths () and a flow path switching valve () are provided in the flow path switching block (). The plasticization device (), the first plunger injection device (), the injecting portion () and the second plunger injection device () are connected to the first to fourth connecting flow paths (), respectively. When the flow path switching valve () is switched to a first position, the first and second connecting flow paths () communicate with each other, and the third and fourth connecting flow paths () communicate with each other, whereas when the flow path switching valve () is switched to a second position, the first and fourth connecting flow paths () communicate with each other and the first and third connecting flow paths () communicate with each other.