| 摘要 |
A paper-retaining mechanism (10) is disclosed as including a base (12), two posts (14) fixed to the base, two arches (16) movable relative to the base and the posts between a closed position in which the arches are in contact with the posts to form two closed rings and an open position in which the arches are out of contact with the posts whereby the rings are open, and a switch (34) reciprocable along a straight line between a first position to move the arches to the closed position and a second position to allow the arches to move to the open position.
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