| 摘要 |
In a photographic enlarger apparatus having a carriage operatively connected to a vertical column for movement thereon to a selected position, an alignment structure is provided for maintaining the carriage in three-dimensional alignment with the column. In one embodiment, a roller captively eccentrically journaled in the front of the carriage is biased against one face of the column to maintain the carriage in axial alignment with respect thereto. Further alignment of the carriage with respect to the column is provided by four wheels mounted in the back of the carriage to rotatably engage opposed channels formed in the rear of the column, two vertically aligned wheels being spring-biased against one channel and coacting with two vertically aligned fixed wheels riding in an opposite channel to urge the carriage into constant lateral alignment.
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