| 摘要 |
The present invention provides apparatus for forming a fold in a length of flexible sheet material comprising a horizontal support for supporting a length of flexible sheet with a portion thereof to be folded lying over a transverse edge of the support, a horizontal cord arranged above and beyond said edge of the support, means for downwardly deforming the cord so that at least a portion thereof lies below the level of said support beneath said portion of the sheet to be folded when a sheet is present on the support, and means for tensioning the cord against the action of said deforming means to straighten the cord and to thereby raise said portion of the sheet, forming a fold therein around the cord. The apparatus is intended to be used primarily in a hemming machine having a machine head, for forming a seam in a fold made in the sheet, displaceably mounted for movement in a direction parallel to said transverse edge of the support, such that the head traverses longitudinally along a fold formed by the cord. |
