| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent quality deterioration of a marking. <P>SOLUTION: When viewing a cylindrical inner casing 21 from the axial direction, the shape of an inner periphery 21a of the inner casing 21 is made regular hexagonal, plural pins 22 are disposed in multiple rows in the inner casing 21, the pins 22 of adjacent rows are arranged in a zigzag shape, and each pin 22 is brought into contact with the pins 22 adjacent thereto. <P>COPYRIGHT: (C)2012,JPO&INPIT |
