| 摘要 |
PURPOSE:To facilitate assembling, adjusting and dismantling of an impact dot head having multi-stage lamination through simple structure, by stopping a prestage electromagnetic drive unit contained in the tubular section of a nose thereto, and holding it in a regular position. CONSTITUTION:A stopper board 35 for a first stage electromagnetic drive unit A is first assembled, then the body 41 of a stopper member 40 is pressure inserted into a fitting section 6 provided at a tubular section 2 of a nose 1 from the left. Here, a lower stopper chip 44 slides over the upper face of the fitting section 6 under upwardly flexed state, while an upper stopper chip 45 slides over the upper face of a groove 3 under downwardly flexed state. Upon arrival to a fixed position, the lower stopper chip 44 is reset by self resetting force and fitted in a through-hole 5, where the tip portion thereof stops to the side wall of the through-hole 5 and the upper stopper chip 45 stops to the upper wall of the groove 3. At the same time, the tip portion of a tongue 46 fits in a removed portion 37 of the stopper board 35 and stops to the side wall thereof so as to push the upper portion of the stopper board 35 to the right. Since stopper chips 44, 45 stop at the side wall of the through-hole 5 and the upper wall of the groove 3, they are held in place and not removed from the fitting section 6. |
