| 摘要 |
A centering mechanism having two centering sections, each including a supporting frame extending in a generally parallel spaced-apart relation to the frame of the other centering section, first and second centering columns rotatably mounted in the frame, and a centering arm provided at an end of each centering column remote from the frame, first and second drive wheels for driving the first and second centering columns, respectively, and a flexible member trained about the first and second drive wheels to drive them in opposite directions, movement of the flexible member in a first direction driving the ends of the centering arms remote from the centering columns toward each other and movement of the flexible member in a second and opposite direction driving the ends of the centering arms remote from the centering columns away from each other.
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