Patent ID: 6932209

Claim:
A transfer device comprising: an upper mechanism; and a lower mechanism associated with the upper mechanism; wherein the upper mechanism includes a first endless belt that circulates in forward and reverse directions, the lower mechanism including a second endless belt that circulates in forward and reverse directions independently of the first endless belt; wherein each of the first and the second mechanisms comprises a frame, a first main roller rotatably supported by the frame, a second main roller rotatably supported by the frame and spaced away from the first main roller; a first arm pivotably supported by the frame, a second arm pivotably supported by the frame and positioned opposite to the first arm, a first auxiliary roller rotatably supported by an end of the first arm, and a second auxiliary roller rotatably supported by an end of the second arm; and wherein the endless belt circulates in engagement with the first main roller, the second main roller, the first auxiliary roller and the second auxiliary roller.