| 摘要 |
PURPOSE:To change-over 1-second hand operation and high-speed hand operation by releasing a mechanism for preventing one-way rotation to permit the low- speed rotation motion of the second hand when a speed changer rotates in either forward or backward direction and to actuate said mechanism when the speed changer rotates in the other direction. CONSTITUTION:The changer consists of a bipolar stator 1a, a coil 1b and a rotor 2 and the rotor 2 rotates 180 deg. with 1-pulse signal in the forward rotation in the arrow 2c direction. The rotor rotates 180 deg. with one signal of the composite waveform signal in the arrow 2d direction in the backward rotation. The rotor 2 rotates 180 deg. counterclockwise at 1Hz in the stage of ordinary hand operation and the rotation of the second hand shaft is 6 deg.. The second hand 17 makes the ordinary time operation at every 1sec. On the other hand, a backward operation signal is inputted at 5Hz to the changer coil 1b and the rotor rotates 180 deg. each clockwise at 0.2sec. The change-over of the 1-second hand operation and the high-speed hand operation is made possible only from the difference in the rotating direction with one changer according to the above- mentioned constitution. |
