| 摘要 |
PURPOSE:To hold a screen under a tensioned state while screen frames are made movable in a lateral direction, by providing plasticity to the screen frames on both sides in the longitudinal direction being the moving direction of a squeezee in the vertical direction of a screen surface. CONSTITUTION:Left springs 41, 42 having surfaces in the same direction as a screen surface are used as screen frames in a longitiduinal direction. The frames 41, 42 each comprising the leaf spring in the longitudinal direction are deformed themselves in an up-and-down direction corresponding to the deformation of the screen surface and screen frames 43, 44 move in the longitudinal direction by the deformation of said frames 41, 42 and the mutual distance between them can be adjusted. The leaf springs attempt to always become linear by the recovery force thereof due to elasticity to keep a state pushing the screen frames 43, 44 in the lateral direction to the outside and can hold a screen in a state having tension in the longitudinal direction as a result.
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