Patent ID: 8721324

Claim:
An injection device, comprising: an injecting portion; and a material feeding portion configured to contain a pelletized resinous material, wherein the material feeding portion includes a cylindrical feeding passage that is communicated with the injecting portion, a screw that is disposed in the feeding passage, and a drive mechanism that is configured to rotate the screw about a rotational axis; wherein when the screw is rotated about the rotational axis by the drive mechanism, the pelletized resinous material is fed into the injecting portion; wherein the drive mechanism of the material feeding portion includes a drive cylinder having an actuating rod, a pair of links respectively connecting the actuating rod and the screw, and one-way clutches that are respectively positioned between the links and the screw; and wherein the one-way clutches are respectively arranged and constructed to rotate the screw in a predetermined direction when the actuating rod of the drive cylinder reciprocates.