| 摘要 |
PURPOSE:To prevent wear or a breakage of a needle or a member performing a pressing operation of the needle, by a method wherein force performing the pressing operation of the needle is applied to the member by making a direction of the force substantially coincides with an axial direction of the needle. CONSTITUTION:When an actuators 8a, 8b are driven, driving is transferred to end parts 10a, 10b of a pressing member through driving rods 9a, 9b and a connecting member 12 and the pressing member 10 is pushed forward and a needle 2 is moved forward. In this instance, a rear end of the needle is in the center of the pressing member 10 and the foregoing actuators 8a, 8b are driven synchronously. Therefore, moment around a contact point P between the needle and the pressing member is balanced, the pressing member 10 does not perform a rotary motion and the pressing member 10 is moved in parallel with an axial direction of the needle 2. Therefore, force to be applied to a rear end of the needle 2 becomes coincidence completely with the axial direction of the needle 2, pressing operation of the needle 2 is performed smooth without being twisted between the needle and the subject 3 of the nozzle and bend or a breakage of the needle is prevented. |
