| 摘要 |
A platen cover used in a document reproduction machine is provided with a mechanism for selectively engaging and disengaging a movable registration guide from the platen surface. The movable registration guide cooperates with a fixed guide to provide a corner registered edge for positioning of one size document. For larger documents, the movable guide is engaged by the platen cover and pivoted therewith to permit the larger document to be placed on the platen in a new position which maintains optical system center line.
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