| 摘要 |
PURPOSE:To promote durability of a tension roller by making pressure-contact of the tension roller to a wrapping conduction means without bringing into contact with a bracket to compensate the slack. CONSTITUTION:When a motor 11 is rotated forwardly and reversely, a pulley 17 is rotated, a belt 22 wound thereon is rotated around it, and a sliding door 3 interlocked with a wrapping conduction means 22 through a bracket 23 is opened and closed along a guide rail 2. In the case of opening and closing, when the sliding door 3 passes an intermediate section 2c between a linear section 2a and a curve section 2b of the guide rail 2, the front end section of the bracket 23 also passes an intermediate section T3 between a linear section T1 and a curve section T2 in a moving locus running parallel with the guide rail 2. At that time, a tension roller 28 is brought into contact with a stopper 32, and it is stopped at a position leaving a proper space inward from the front end of the bracket 23, and it is not brought into contact with the front end of the bracket 23 and the wrapping conduction means 22. |
