| 摘要 |
PURPOSE:To suitably spread a sheet having therein longitudinal wrinkles, by clamping a sheet on travel between rollers and a press-roller only at both edges, and by bearing the direction of the press-roller obliquely outward to apply a suitable widthwise tension to the sheet between the clamped parts. CONSTITUTION:A lower roller 3 is, for example, a common existing expander roller while upper rollers 5 are journalled to the front ends of arms 7 which are freely swing about a horizontal support rod 6 as a shaft. Further, the sup port rod 6 is removably inserted into a hole in a support block 8, and is secured by rotating a head handle 9. Further, the support block 8 is rotated for adjust ment to change the angle theta of the upper roller 5. Further more, a sheet S on travel is held by the weight of the upper roller 5 and is clamped between the upper and lower rollers 5, 3. With this arrangement, the above-mentioned angle thetadetermines the direction of the frictional force F between the upper and lower rollers 5, 3 and the sheet S, from which the component force widthwise of the sheet, T=Fsintheta is obtained. With this arrangement the sheet S having there in longitudinal wrinkles is spread. |
