초록 ▼

A machine for folding materials is disclosed in which the portion of the material is engaged and folded by a rotary cam such that the surface of the portion is engaged and not the edges of the portion. In the preferred embodiment, creasing rollers are positioned along the fold line above the rotary

A machine for folding materials is disclosed in which the portion of the material is engaged and folded by a rotary cam such that the surface of the portion is engaged and not the edges of the portion. In the preferred embodiment, creasing rollers are positioned along the fold line above the rotary cam folders such that the fold is made very accurately.

대표청구항 ▼

[ What is claimed is:] [11.] A rotary folder for folding a first portion of a sheet of corrugated cardboard material relative to a second portion of said corrugated sheet material as the sheet travels through said folder in a travel direction, said sheet including a surface portion and a leading edg

[ What is claimed is:] [11.] A rotary folder for folding a first portion of a sheet of corrugated cardboard material relative to a second portion of said corrugated sheet material as the sheet travels through said folder in a travel direction, said sheet including a surface portion and a leading edge portion, said rotary folder comprising:(a) an axis of rotation;(b) rotary cam means forming an elongated solid surface of revolution about said axis; and(c) said rotary cam means having a spiral cross-section of increasing radii in the direction of travel of the sheet such that said solid surface of revolution engages the surface portion of said first portion and folds it relative to said second portion without engaging the edge portions of said sheet.