| 摘要 |
A circular open end portion of a ham-wrapping tube, before clipping the same with rings, is compressed by regulating elements at two diametrically opposite regions thereof toward the center of a cross section of the tube-end, until the distance between these regions has been shortened to a level equal to the width of each of folds to be formed in the tube-end. Thereafter, the narrowed tube-end is compressed by gathering rods at two opposite corner regions thereof at once toward the center of a cross section of the narrowed tube-end. Thus, the tube-end can be gathering in zigzags. |
