Door operating device for a slide door unit

In a door operating device for a slide door unit including a wall having an opening formed therein, at least one curved guide rail fixedly extended along said wall and a door slidably associated with said guide rail by means of guide means so that the door is guided to be placed with the outside surface thereof arranged flush with the outside surface of said wall when the door closes the opening of said wall and the door is guided so as to slide along and in parallel to the outside surface of the wall when the door is opened, said door operating device comprising;

• a guide member secured to the inside surface of said door and having a plate-shaped engaging flange extending in parallel to the sliding direction of the door;
• a first turnable arm supported at the base portion thereof so as to be turnable within a horizontal plane on a stationary portion with respect to said wall;
• a driving pulley supported on the base portion of said first turnable arm so as to be rotatable with respect to the first turnable arm;
• a second turnable arm supported at the first end thereof on the free end of said first turnable arm with a first shaft so as to be turnable within a horizontal plane;
• an intermediate pulley supported rotatably on said first shaft;
• a third turnable arm supported at the first end thereof on the second end of said second turnable arm with a second shaft so as to be turnable within a horizontal plane;
• a driven pulley rotatably supported on said second shaft;
• a driving wheel fixed to said driven pulley so as to be turned together with said driven pulley;
• a roller rotatably supported on the second end of said third turnable arm with a shaft extending in parallel to the axis of rotation of said driving wheel and adapted so as to engage with the engaging flange of said guide member and to receive the engaging flange closely between the roller and said driving wheel;
• a prime mover;
• a first torque transmitting means for transmitting the torque of the output shaft of said prime mover to said driving pulley;
• and
• a second torque transmitting means for transmitting the rotation of said driving pulley to said driven pulley through said intermediate pulley.