| 摘要 |
PURPOSE:To position a film under remote control and facilitate the setting of the film by fixing the film to two platforms which move forth and back, and left and right on the film placing plate of an overhead projector. CONSTITUTION:The film is adhered fixedly to the longitudinal member 14 of a platform 10 to project its image upon a screen. When the film 2 is moved up or down, a motor 9 is rotated normally or reversely and the other platform 4 moves along a stud 6. The platform 10 is fixed vertically to a stud 11 fixed to the platform 4, so the film 2 moves up and down. The platform 10 moves along the stud 11 by the normal or reverse rotation of a motor 13, and consequently the film also moves left or right. Which of the motors 9 and 13 is driven first is not important and the both may be started at the same time. The motors 9 and 13 are stopped from rotating where an image of the film 2 is projected accurately on the screen. |
