| 摘要 |
A transmission mechanism which includes a pair of gears bilaterally disposed at one end of a scanning path defined inside a scanner, a first pair of fixed pulleys respectively and fixedly mounted on the gears, a second pair of fixed pulleys bilaterally disposed at an opposite end of the scanning path, a pair of movable pulleys synchronously moved along the scanning path, and a flexible transmission member mounted on the fixed pulleys and the movable pulleys subject to a designed order for power transmission for permitting the movable pulleys to be moved synchronously along the scanning path. By means of changing the revolving direction of the gears and the tangential velocity of the first fixed pulley and second fixed pulley, a different speed ratio is obtained.
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