punch mechanism; punch unit
Technical term for a device that punches holes in cards, paper tape, or similar media. Used in computing and office equipment contexts.
This punch mechanism can punch holes in 100 cards per minute.
穿孔機 is a general term for a punching machine or perforator, while 穿孔機構 specifically refers to the mechanism or unit that performs the punching action.
Compound of 穿孔 (せんこう, 'perforation, punching') and 機構 (きこう, 'mechanism'). A straightforward technical term.