| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve problems (secular distortion, mechanical abrasion, influence of external stress and cause of malfunction) caused by control by mechanical detection such as a limit switch and the like in controlling opening and closing motion of a door body 2 of a doorway of freezing and refrigerating storages. <P>SOLUTION: This door opening and closing mechanism is provided with stopper portions (collision of stopper portion 3 and contact portion 28b, and collision of contact portions 28a to each other) with which a door body collides, at a full-opened position and a full-closed position of the door body with respect to the door body 2 of the refrigerating storage and the freezing storage running and driven on a rail 1 by a driving motor 42, an invertor control is applied in controlling the driving of the driving motor 42, an overload stop function is provided, and the full-open and full closure of the door body 2 are controlled only by electric control of the driving motor without applying the limit switch. <P>COPYRIGHT: (C)2008,JPO&INPIT |
