Punch.

摘要

A punch is disclosed, which can be used with an automatic paper feeder or a plane paper copy for receiving sheet-like members one by one from such machine and forming punched holes in each sheet-like member at a punching position thereof. A punching member (78) is disposed in correspondence to the punching position for effecting punching with a predetermined stroke. A dimensional strain generated in an electrical-to-mechanical conversion element such as a piezoelectric element (80) or a magnetostriction element is transmitted after enlargement by an enlarging member (82) disposed to surround the element through a movable output terminal (82c) and an operation transmission lever (86) to the punching member to cause high speed operation thereof in a predetermined stroke range. High quality punched holes free from curved edge or like difficiency thus can be formed even in a continuous feed state without holding sheet-like member stationary for a while.