| 摘要 |
A plurality of steps 33 are connected to a pair of step chains 32 wound around step chain sprockets 30. The step chain sprockets 30 drives the step chains 32 to turn the step chains 32 through a forward path 43a, a return path 43b, and reversing areas at the opposite ends of the forward path and the return path. Front wheels 39 are supported on shafts attached to the opposite side surfaces of a front part of the step 33 and connected to the step chains 32, respectively. Rear wheels 40 are supported on a rear part of the step 33. Front wheel guide rails 44 supporting and guiding the front wheels 39 and rear wheel guide rails 45 for supporting and guiding the rear wheels 40 guides the step 33 in the forward path. In the reversing area, in which the step is inverted, an auxiliary step guide means including auxiliary rollers 41 and auxiliary roller guide rails 46 controls the position of the step 33 such that the rear wheels approach a connecting shaft 30a supporting the step chain sprockets 30. The depthwise dimension of a part, corresponding to the reversing unit, of a frame is small.
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