環保釘書機 / pin-free stapler

買墨水匣的贈品, 把紙伸到小狗的嘴巴, 按下去就可以釘了. 它的原理如圖示,  在紙張打出C形和I形的洞, 再自動把C形洞製造出來的小舌頭塞到小縫裏面, 紙張就會扣在一起了. 可惜我這一個刀片太銳, 往往無法做出很漂亮的紙舌和洞, 經常不能成功塞到小縫中, 費時失事.
this stapler chains papers together by cutting a little tongue and hole and coupling them automatically as the picture shown above.
(pencil)

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