| 摘要 |
This disclosure depicts apparatus and method for selectively varying character magnification during photocomposition. Photocomposing apparatus is shown as including means for displaying a character to be recorded and a plurality of lenses of different focal length mounted upon a rotatable lens turret. Novel turret indexing means is disclosed as comprising turret monitoring means for determining coarsely when a selected one of the lenses is approaching an axis along which the characters are projected, switch means actuated by cam means on the turret for determining when the selected lens is substantially on the projection axis, and extremely accurate turret locking means which is responsive to inputs from the turret-monitoring means and the switch means for locking the turret with the selected lens located precisely on the projection axis.
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