| 摘要 |
PURPOSE:To quickly switch a speed cam, also to simplify the structure, and to make it applicable to high-speed copying, by constituting a titled device so that the speed cam for setting a scanning speed of an optical system is switched in a pressurized state. CONSTITUTION:On one of pressure receiving arms 55, 56 of a copying factor switching device B, speed cams 45, 46 are brought into abutment, and on the other, a selecting cam 64 in a rocking body 63 is brought into abutment, and the rocking body 63 is energized to the pressure receiving arm side by a coil spring 74. When switching to unmagnification copying, the second mirror 5 is set to the unmagnification position, and thereafter, the selecting cam 64 is brought into abutment on the speed cam 45 for unmagnification use by a motor 70. In this case, the switching is executed smoothly under a pressurized state of the spring 74. Subsequently, when a motor 50 is driven, an optical system A is rotated forward and backward through a driving body 44 in accordance with the ascending side and descending side of the cam 45. Therefore, the speed cam is switched smoothly and quickly under a pressurized state, and it is applicable to high-speed copying. |
