| 摘要 |
<p>In order to design a punch assembly (100) with a punch (13) to produce on the surfaces of workpieces (14), including workpieces made of plastics materials, such as acrylic-glass rollers, a non-interfering identification mark which cannot easily be counterfeited, the invention proposes that the punch (13) is mounted on a motor-driven swing head (12).</p> |
