| 摘要 |
A roller system comprising a pulley having a permanent magnet sandwiched in between a pair of temporarily magnetic disks with the magnetism of the disks induced by the permanent magnet. For example, each temporarily magnetic disk comprises steel. Each pole of the permanent magnet is disposed adjacent to a pole of one of the temporarily magnetic disks that is of an opposing polarity resulting in a magnetic attraction to a disk at each pole of the permanent magnet. The opposing magnetic poles form a magnetic flux circuit by which a temporarily magnetic belt, such as a steel belt is guidable to prevent or reduce deviation which it may have from its roller path. Additional permanent magnetic rollers, as described above, or other rollers known in the art may be combined with the magnetic roller of the present invention to form a gear train about which the belt rotates.
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