Actuator for automotive door locking device

An actuator for an automotive door locking device comprising:

• a rotating member 62 that is rotatable by a power source M;
• a cam groove formed in the rotating member 62;
• a cam follower 76 that moves along the cam groove;
• and
• a lock lever 31 which moves between a lock position and a unlock position as a result of the movement of the cam follower 76;
• the cam groove having a first groove 70 for moving the lock lever 31 between the lock position and the unlock position and a second groove 71 for moving the cam follower 76 between the ends 70a, 70b of the first groove 70 without using the first groove 70,
• the first groove 70 having on one of its side walls at least a first inclined wall 71c, for moving the cam follower 76 from one end 70a of the first groove 70 to the other end 70b and a second inclined wall 71a, which is inclined reverse to the first inclined wall 71c;
• the first groove 70 having on the other side wall at least a third inclined wall 71d, for moving the cam follower 76 from the second end 70b to the first end 70a of the first groove 70 and a fourth inclined wall 71b, which is inclined reverse to the third inclined wall 71d;
• whereby the first through fourth inclined walls 71a, 71b, 71c, 71d of the first groove 70 are cut in such a way that the pressure angles between the cam follower 76 and the first through fourth inclined walls 71a, 71b, 71c, 71d are almost constant.