| 摘要 |
<p>PURPOSE:To return a rotary plate with a resilient member when motor is stopped, by furnishing a guide part to guide a follower pin from the starting to finish point of a changeover groove including an arc-shaped groove, which times the starting end with finish end of a semi-circular cam groove provided in the rotary plate and which is concentrical to the center of swinging of an operational member, and installing another guide part to make guidance from the finish to starting point. CONSTITUTION:A changeover groove 31 as a cam groove is formed in a rotary plate (cam gear) 30, and is equipped with No.1, No.2 guide part 38, 39. A follower pin 41 on a swingable arc-shaped gear 40 is detained with this cam groove 31 slidably. When this cam gear 30 is rotated clockwise by a motor 20, the follower pin 41 is guided by the guide part 38 to the finish point 44b to put the arc-shaped gear 40 in rotation, which rotates a sector-shaped gear 42 to cause rotation in turn of a rod 45 (output shaft). When the motor 20 stops, the cam gear 30 is returned by a torsion spring while the follower pin 41 is left in the place by the changeover groove 31, which provides the unlocked state. This accomplishes the device being constructed in a small size and ensures locking and unlocking motion of a car door etc.</p> |
