| 摘要 |
A film positioning mechanism for a microfilm camera includes a movable platen 12 mounting a rotary shaft member 19, 22 and brake means 23, 28 for selectively locking the shaft member against rotation. When the brake means is engaged, a film strip held to the platen by vacuum pressure is advanced along with the platen by a drive motor 14, whereas when the brake means is disengaged from the shaft member and the platen is arrested by a stop pin 31 or 31', a film driving roller 25 is driven by the motor 14 via the shaft member and a belt 24, thereby advancing the film while the platen remains stationary. Thus, a single motor both feeds the film and moves the platen. The mechanism can operate in both a roll-to-roll mode and a roll-to-sheet mode, the latter employing a film cutter 49, 50.
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