| 摘要 |
A blade which is a part of a binding device forms a binding hole and a cut hole and binds a plurality of sheet bodies together by using a cut and raised piece cut raised out of the binding hole and the cut hole, the blade includes a core, an outer covering including a sheet metal and covering an outside of the core, and a cutting edge including a curved portion having a curved arc shape in a bottom view and liner portions extending from both ends of the curved portion in the bottom view, the cutting edge being continuous in a U shape and formed at a tip end of the outer covering, the curved portion includes a blade tip end portion and an adjacent portion adjacent to the blade tip end portion. |
| 主权项 |
1. A blade which is a part of a binding device forming a binding hole and a cut hole and binding a plurality of sheet bodies together by using a cut and raised piece cut and raised out of the binding hole and the cut hole, the blade comprising:
a core; an outer covering comprising a sheet metal and covering an outside of the core; and a cutting edge including a curved portion having a curved arc shape in a bottom view and liner portions extending from both ends of the curved portion in the bottom view, the cutting edge being continuous in a U shape and formed at a tip end of the outer covering, the curved portion comprising:
a blade tip end portion which first comes in contact with a sheet bodies, a portion of which includes substantially a point, in starting to form a hole before sharply stuck into the sheet bodies; andan adjacent portion adjacent to the blade tip end portion and formed concave curve in a front view, the cutting edge except the blade tip end portion and the adjacent portion being formed liner in the front view.
|
