| 摘要 |
<p>PROBLEM TO BE SOLVED: To maintain a contact condition under uniform contact pressure by applying the constitution that one of blades as a pair is formed to have smaller thicknesswise deformation resistance against the support means of the blade at both lengthwise ends than at a lengthwise intermediate position. SOLUTION: The flexural deformation amount of both lengthwise ends 3a and 3b of a moving blade 3 coming in contact with both lengthwise ends 2a and 2b of a stationary blade 2 is small, but both lengthwise ends 2a and 2b of the stationary blade 2 have low thicknesswise deformation resistance against a support plate 21. Thus, both lengthwise ends 2a and 2b, when in contact with the moving blade 3, can be deformed so as to escape therefrom. As a result, contact pressure drops, when both lengthwise ends 2a and 2b of the stationary blade 2 come in contact with both lengthwise ends 3a and 3b of the moving blade 3.</p> |
