| 摘要 |
FIELD: stationery. SUBSTANCE: the offered office puncher has base 1 with matrixes. Secured in base are posts connected with spring-loaded punches 4 and fixing stops 9 which serve to orient the edges of punched sheets. Located over base 1 is cross-piece 6 with punches 4. Posts secured in base are made in form of bushings and connected with punches by means of movable rods 5 whose lower ends are installed for motion in holes of posts, and upper ends are fastened to cross-piece with punches. Upper ends of punches are rounded with radius from 0.05 to 0.10 mm, and angles at top amount to 32-38 deg. After installation of sheets with the aid of stops 9 and clamp 7 to the required position, working stroke of punches is effected by moving the cross-piece downward. Reverse stroke of punches is accomplished by springs 12. EFFECT: provision of reliable and durable operation of punches with simultaneous preservation of information applied to sheets. 1 cl, 3 dwg |
