| 摘要 |
The component (35) with the projections (40) can be pushed into a position where the film is maintained flat, and in which the projections (40) are facing the base (37). This enables the film to be clamped along at least two opposite edge areas between the base and the outer edges of the projections. In the free position of the component (35), the projections are at a distance from the base, allowing the film to be moved freely. Each projection (40) comprises a body of soft, elastic material fixed to the component (35), and each with an outer edge for pressing against the film (38). They are in inclined position so that the edge surfaces are located nearer to the film edge to be pressed than the position where they are attached to the component. When their edge surfaces are pressed against the film, the projections attempt to bend outwards, thus producing a stretching of the film simultaneous with it being pressed against the base (37). |
