| 摘要 |
The present mechanism essentially comprises a hammer (1) which is rigidly affixed to a flat, flexible leaf spring (5), a magnetic coil (2) having a hollow axial core (13) in which is slidably mounted a magnetic plunger (15), and a push rod (3) one end of which is connected to the plunger (15) and the other end is connected to the hammer impact end (33). The magnetic plunger (5) and the push rod (3) are mounted in substantial alignment with the center of the coil (13) and the center of the hammer impact end (33). When the coil (13) is energized the rod (3) pushes the impact end of the hammer (1), and the bending moment applied to the spring (5) create a restoring force which, when the driving force is removed causes the hammer to return to its rest position. The rest position of the plunger (15) is adjusted by a screw abutment (21) on the end portion of the coil and flux path member (9), and the position at which the plunger (15) stops when energy is applied to the coil (2) is adjusted by another screw abutment (26) at the opposite end of the flux path member (9). This abutment provides the working air gap which determines the total flight time of the hammer and the printing force. |
