| 摘要 |
A magnification changing device for a copying machine has a cam receiver which rides in a cam groove of a driving cam groove cylinder. A cam member is coupled to a bell crank which is, in turn, coupled through a connecting rod to a carriage supporting a main lens. The cam groove has a perpendicular portion, which is in a plane perpendicular to the axis of rotation of the cam groove cylinder, over a predetermined distance in a circumferential direction of the cam groove at a preset magnification setting position. As the cam groove cylinder is rotated, the cam receiver follows the cam groove until the cam receiver reaches the perpendicular portion of the cam groove, which accurately positions the lens.
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