| 摘要 |
PROBLEM TO BE SOLVED: To form a nozzle of desired shape easily and inexpensively by piecing a nozzle plate with a funnel-like punch having a conically pointed thin diameter part to make a hole in the nozzle plate and then grinding the projecting part of the nozzle plate on the ink ejecting side to make a hole before finishing the nozzle. SOLUTION: A nozzle plate 1 made of stainless material, or the like, is pieced with a funnel-like punch 2 having a conical projecting part 22 at the forward end of a thin diameter part 21. The part 11 of the nozzle plate 1 projecting to the ink ejecting side is received in the hole 31 of a die 3. Up/down motion of the punch 2 is regulated by the guide hole 41 in a pin holder 4. Subsequently, the projecting part 11 of the nozzle plate 1 on the ink ejecting side is ground to make a hole before finishing the nozzle. A hole part 52 having a taper corresponding to the tapered part 23 of the punch 2 and a thin hole part 51 corresponding to the thin diameter part 21 are then formed on the nozzle plate 1. Since the nozzle plate 1 is not punched, punching can be carried out easily and accurately.
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