| 摘要 |
Two leaf springs (18a, 18'a) are attached to each of the sides of the quadrilateral frame forming the end of the top nozzle. Their fixing points (22a, 22'a) are separated from each other and situated close to the angle of the frame. The leaves (21a, 21b, 21c; 21'a, 21'b, 21'c) of the springs (18a, 18'a) are inclined to the surface of the frame in opposite directions.
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