| 摘要 |
To permit individual adjustment of lamellae (1, 1a) secured to a holding strip or rail (4), each one of the lamellae is formed with an elongated opening (8) or a slit(8a) extending to a remote end of the lamella, so that the lamellae can be individual ly shifted with respect to a roller (11), thereby adjusting the position of the lamellae fo r wear, and permitting a range of adjustment which is in excess of that which can be control led by a film thickness adjustment screw (13).
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