To provide a robot emergency stop switch mechanism capable of taking an emergency stop position when an operating external force is released and a strong operating external force is applied.
When a robot is started to operate, a main lever La is pressed down from an OFF state as shown in Fig. (a) using a normal operating external force. Because a spring biasing force S2 is larger sufficiently than S1, a second auxiliary lever Lc is pressed by a plunger PL, and swung downward together with a first auxiliary lever Lb. Then the movable contact element ME of a contact mechanism part CM is moved to ON position by the second auxiliary lever Lc, coming under ON state (operation allowed) as shown in Fig. (b). When an emergency stop is required, the pressing on the main lever La is released or a particularly strong force is applied to the main lever La under the state as shown in Fig. (b). When the former is selected, the state returns to OFF state as shown in Fig. (a). When the latter is selected, a strong torque is applied to a shaft AX2, first and second auxiliary levers Lb and Lc come under the bent state as shown in Fig. (c), and OFF state is also realized so as to stop the robot.
YASUMURA MITSUHIRO
ABE KENICHIRO
