发明名称 |
Perforator for metal plate |
摘要 |
A perforator for presensitized plate has plural punches and a die array cooperating with the punches. A stripper plate retains the plate adjacent the die array when punches separate from the die array after the punches form punched holes in the plate. The punches and/or the die array is coated with non-crystalline hard carbon. The punched holes are formed in the plate. In a preferred embodiment, the coating of the punches and/or die array has a surface whose roughness is 0.8 mu m or less. A clearance defined between the punches and the die array is 10 to 30% of the thickness of the plate. Each advancing end of the punches is provided with a cylindrical tip portion of lesser width than the rest of the punch. The stripper plate is provided with a cushioning material mounted for contact with the plate.
|
申请公布号 |
US5992280(A) |
申请公布日期 |
1999.11.30 |
申请号 |
US19970847812 |
申请日期 |
1997.04.25 |
申请人 |
FUJI PHOTO FILM CO., LTD. |
发明人 |
OISHI, HIROHIKO;SONE, SIGEMITSU |
分类号 |
B21D28/14;B21D28/16;B21D37/01;B21D45/00;(IPC1-7):B26F1/14 |
主分类号 |
B21D28/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|