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A hole punch (known also as a holing pincer, hole puncher, hole maker, or most commonly as a perforator or paper puncher) is a common office tool that is used to create holes in sheets of paper, often for the purpose of collecting the sheets in a binder or folder. A leather punch, of different construction from one designed for paper, is used for leather goods, cloth, or thin plastic sheeting. Hole punch tools are also made to used on sheet metal, such as aluminum siding or air ducts. == Mechanism == A typical hole punch, whether a single or multiple hole punch, has a long lever which is used to push a bladed cylinder straight through a number of sheets of paper. As the vertical travel distance of the cylinder is only a few millimeters, it can be positioned within a centimeter of the lever fulcrum. For low volume hole punches, the resulting lever need not be more than for sufficient force. Two paper guides are needed to line up the paper: one opposite where the paper is inserted, to set the margin distance, and one on an adjacent side. Hole punches for industrial volumes (hundreds of sheets) feature very long lever arms, but function identically. Another mechanism uses hollowed drills which are lowered by a screwing action into the paper. The paper is cut and forced up into the shaft of the drill to be later discarded as tightly packed columns of waste paper. This method allows a small machine to cut industrial volumes of paper with little effort. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hole punch」の詳細全文を読む スポンサード リンク
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