| 摘要 |
The present invention relates to a punching device, which comprises a shaft performing a rotational motion by a driving means; a cam having an insertion hole where the shaft is inserted, and rotating along the rotation of the shaft; a cam holder holding the cam; a cover cam combined in the upper part of the cam holder; and multiple punching members installed under the cam holder and moving up and down along the rotation of the cam to punch the supplied paper. When the cam holder and the cover cam are combined, the combined parts on both sides of the cam holder and the cover cam are completely combined, the combined parts in the middle of the cam holder and the cover cam form a gap in a predetermined range. As such, the rotary interference of the cam generated by the size difference of the outer diameter of the cam, or bending of the cam is prevented and the noise occurrence due to rotation of the cam is reduced by closely fixing both ends of the cam holder and the cover cam, and forming a gap in a preset range in the middle of the cam holder and the cover cam, in combination of the cam holder mounting the cam, and the cover cam. |
