| 摘要 |
PROBLEM TO BE SOLVED: To provide a jump sewing machine device capable of adjusting positions of jump portions of perforations while using a cam mechanism when pushing a disc blade on the circumference of which blades are intermittently provided against paper to form the perforations.SOLUTION: A jump sewing machine device 3 has a combined cam plate 35 for giving up-and-dowm movement to a disc blade 12. The cam plate 35 is constructed by one or more unit cam plates. The positions of protruded portions of the unit cam plates are universally set to construct the combined cam plate 35. Thus, positions of jump portions set on paper 11 are adjustable. |
