| 摘要 |
Facsimile scanning apparatus is provided with two carriages which move in antiphase with one another along parallel rails and respectively scan alternate lines. The two carriages are interconnected by a tensioned inextensible loop passing around a pulley at one end of the rails. The pulley is movable towards and away from the rails so that the phase relationship of the carriages may be adjusted while the apparatus is in use, thus ensuring that the desired 180 DEG antiphase relationship necessary for good facsimile reproduction can be attained quickly and easily.
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